3.3 Control - Movicom Electric Docs

1

(% data-numbered-headings-start="3" style="--numbered-headings-start: 2;font-size: 0px;color: rgba(0, 0, 0, 0.0);margin-bottom: 0px; margin-top: 0px;" %)

2

= Settings =

3

4

(% data-numbered-headings-start="3" style="--numbered-headings-start: 2;font-size: 0px;color: rgba(0, 0, 0, 0.0);margin-bottom: 0px; margin-top: 0px;" %)

5

== Control ==

6

7

=== Common settings ===

8

9

To change the common BMS settings, select the "Control → Common settings" section:

10

11

[[image:1740394523706-519.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="127" width="800"]]

In this section:

* Cell capacity – nominal capacity of cells, Ah;

16

* Cell resistance – nominal (maximum) internal resistance of the cell, Ohm;

17

* Relax time (after charging) – a relaxation time after charging, second;

18

* Relax time (atfer discharging) – the relaxation time after discharging, second;

19

* Reset parameters– a command to reset cells state of charge, capacity, and resistance.

20

21

The values “Capacity” and “Resistance” are used to calculate the SOC of cells and the battery.

22

23

The values of “Relax time” are used to determine the state of the battery. If the battery is in a state of relaxation, the system recalculates the voltage on the cells to the state of charge of the battery.

24

25

The “Reset parameters” will reset:

26

27

* state of charge (new cell SOC values will be calculated based on cell voltage and “Uocv (open-circuit voltage) table”: in the “Control → SOC estimation” section);

28

* cell resistance to “Cell resistance” value;

29

* battery capacity to “Cell capacity” value.

30

31

The “Reset parameters” command is used for starting-up and adjustment of the battery.

32

33

=== SOC estimation ===

34

35

The BMS Mini device calculates the state of charge of the battery (SOC) using two algorithms:

36

37

* by open circuit voltage;

38

* by voltage and current.

39

40

It is recommended to use the algorithm of calculation of SOC by voltage and current.

41

42

To change the estimation algorithm for calculating the battery SOC, select the "Control → SOC estimation → Algorithm" section:

43

44

[[image:1733746733477-590.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="166" width="800"]]

45

46

The following estimation algorithms supported:

47

48

* Voltage – by open circuit voltage;

49

* Current and voltage (simplified);

50

* Current and voltage (enhanced);

51

52

The SOC calculation algorithm for voltage calculates cells SOC based on the tabular dependence Uocv = Uocv(SOC, t °C).

53

54

The SOC calculation algorithm “Current and voltage (simplified)” works as follows:

55

56

* if I = 0, the battery is in a state of relaxation and the cell voltage Uocv is outside the [U,,ocv[point 1],,; U,,ocv[point 2],,], the SOC calculation based on the tabular dependence Uocv = Uocv(SOC, t °C);

57

* in any other cases, the SOC value is proportional to the charge (coulomb) passed through the battery (current time integral).

58

59

The SOC calculation algorithm “Current and voltage (enhanced)” differs from the simplified algorithm by online correction of effective capacitance. When using this algorithm, it is necessary to fine tune the tabular dependence Uocv = Uocv (SOC, t °C).

60

61

To change the algorithm for calculating the Final SOC, select the "Control → SOC estimation → Final SOC" section:

62

63

[[image:1733746733478-414.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="167" width="800"]]

64

65

The following battery Final SOC calculation methods are supported:

66

67

* Minimal SOC – SOC of the modular battery is assumed to be the minimum SOC among the battery modules;

68

* Average SOC – SOC of the modular battery is taken equal to the arithmetic average of the SOC of the battery modules.

69

70

To change other settings of SOC estimation, select the "Control → SOC estimation” section:

71

72

[[image:1733746733479-261.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="165" width="800"]]

In this section:

* Scale the final SOC – a flag to scale the battery SOC by the following values;

77

* SOC corresponding to 0% – battery SOC that sets to be 0%;

78

* SOC corresponding to 100% – battery SOC that sets to be 100%.

79

* Uocv (open-circuit voltage) table – the dependence of the cell open circuit voltage Uocv on SOC and the cell temperature (selected for specific batteries);

80

81

[[image:1733746733480-919.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="484" width="800"]]

82

83

* Linear zone: point 1 – starting point of the linear zone of Uocv dependence;

84

* Linear zone: point 2 – ending point of the linear zone of Uocv dependence;

85

* Coulomb counting correction (temperature) – the dependence of battery capacity on temperature;

86

87

[[image:1733746733481-286.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="160" width="800"]]

88

89

* Coulomb counting correction (cycles) – the dependence of battery capacity on the number of charge-discharge cycles.

90

91

[[image:1733746733482-538.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="161" width="800"]]

92

93

94

=== SOC correction ===

95

96

The BMS Mini device can recalculate the battery SOC after long-term storage or after long-term working in the case when the battery was not charged fully or discharged totally. Recalculation is done based on the tabular dependency Uocv = Uocv (SOC, t) (see [[SOC estimation>>doc:||anchor="HSOCestimation"]]).

97

98

To configure parameters for periodically correcting the battery state of charge, select the "Control → SOC correction" section:

99

100

[[image:1733746733483-444.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="160" width="800"]]

In this section:

* Enable – a flag to enable SOC correction;

105

* Shutdown period – a time the battery is off, day. If the BMS detects on its startup that it was off during the “Shutdown period” time, the BMS recalculates the battery state of charge based on the tabular dependency Uocv = Uocv (SOC, t);

106

* Correction period – a period of correcting the battery SOC, day. If the BMS detects that the last correction was more than the “Correction period” ago, the BMS recalculates the battery state of charge based on the tabular dependency Uocv = Uocv (SOC, t) and tunes it gradually during the “SOC change time”.

107

* SOC change time – a duration of the linear changing the battery SOC to the value calculated by the correction algorithm, minute;

108

* Ignore the linear zone – a flag to ignore linear SOC zone while correction;

109

* Last correction timestamp – time when last correction was made.

110

111

=== Resistance estimation ===

112

113

Calculation of the resistance of cells is carried out in two ways. The first method is used when the battery passes from a relaxation state to a charge or discharge state, wherein the cell resistance value

114

115

R = (U-U,,ocv,,) / I,,stable,,,

116

117

where U is the cell voltage measured in the charge or discharge state, V; U,,ocv,, is the cell voltage measured in the state of relaxation (before switching to the state of charge or discharge); I,,stable,, – stabilized current through the cell in the state of charge or discharge.

118

119

The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:

120

121

R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,

122

123

(Q,,max,, is the maximum cell capacity),

124

125

where U,,2,, is the voltage on the cell at the moment when the stabilized current I,,stable2,, is flowing through it; U,,1,, – the voltage on the cell at the moment when the stabilized current I,,stable1,, flowing through it.

126

127

The stabilized current I,,stable,, = I, if during the stabilization time the instantaneous current I is in the range from 0.95 × I to 1.05 × I.

128

129

To change parameters of the algorithm for calculating the cell resistance, select the "Control → Resistance estimation" section:

130

131

[[image:1733746733484-681.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="104" width="800"]]

In this section:

* Current stabilization time, millisecond;

136

* Maximum calculation period – maximum time between resistance measurements. If more time has elapsed since the last determination of the stabilized current I,,stable,, than is determined in this field, the resistance calculation is not performed, second;

137

* Maximum resistance factor – the coefficient of calculation of the maximum acceptable resistance of the cell;

138

* Minimum SOC – minimum cell SOC value for resistance calculation;

139

* Maximum SOC – maximum cell SOC value for resistance calculation.

140

141

The calculated resistance is accepted by the system as valid (and therefore updated) if its value is in the range from Resistance/2 to “Maximum resistance factor” × Resistance, where "Resistance" is the nominal resistance of the cell (see [[Common settings>>doc:||anchor="HCommonsettings"]]). If the calculated resistance value is greater than the value (Maximum resistance factor × Resistance), the updated resistance value will be equal to the value (Maximum resistance factor × Resistance).

=== Charge map ===

The BMS Mini device calculates maximum allowable charge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.

146

147

Calculated current values are sending to a charger or an intellectual load over the CAN bus.

148

149

To configure parameters for determining the charge current limit, select the "Control → Charge map" section:

150

151

[[image:1733746766504-864.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="138" width="800"]]

In this section:

* Enable – a flag to start calculation of the charge current limit;

156

* Maximum charge current – a maximum allowable value of the charge current (under normal conditions):

157

* Option 1: Limit charge current by the battery SOC and temperature – a flag to enable correction of maximum allowable charging current Kcs depending on SOC and battery temperature;

158

* Option 1: SOC x Temperature x Factor – the dependence of the correction factor on SOC and battery temperature;

159

160

[[image:1733746766506-660.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="196" width="800"]]

161

162

* Option 2: Limit charge current by the contactor temperature – a flag to enable correction of maximum allowable charging current Kcc depending on contactor temperature;

163

* Option 2: Contactor temperature x Factor – the dependence of the correction factor on SOC and contactor temperature;

164

165

[[image:1733746766508-178.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="184" width="800"]]

166

167

* Option 3: Limit charge current by the maximum cell voltage - a flag to enable correction of maximum allowable charging current Kcv depending on maximum cell voltage;

168

* Option 3: Cell voltage x Factor – the dependence of the correction factor on maximum cell voltage.

169

170

[[image:1733746766509-971.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="217" width="800"]]

171

172

Value of the charge current limit at given SOC, temperature, contactors temperature and maximum cell voltage is calculated as follows:

173

174

Charging current limit = Maximum charging current × Kcs × Kcc × Kcv

175

176

=== Discharge map ===

177

178

The BMS Mini device calculates maximum allowable discharge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.

179

180

Calculated current values are sending to a charger or an intellectual load over the CAN bus.

181

182

To configure parameters for determining the discharge current limit, select the "Control → Discharge map" section:

183

184

[[image:1733746766511-477.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="149" width="800"]]

In this section:

* Enable – a flag to start calculation of the discharge current limit;

189

* Maximum discharge current – a maximum allowable value of the discharge current (under normal conditions):

190

* Option 1: Limit discharging current by the battery SOC and temperature – a flag to enable correction of maximum allowable discharging current Kds depending on SOC and temperature;

191

* Option 1: SOC x Temperature x Factor – the dependence of the correction factor on SOC and battery temperature;

192

193

[[image:1733746766512-300.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="195" width="800"]]

194

195

* Option 2: Limit discharge current by the contactor temperature – a flag to enable correction of maximum allowable discharging current Kdc depending on contactor temperature;

196

* Option 2: Contactor temperature x Factor – the dependence of the correction factor on SOC and contactor temperature;

197

198

[[image:1733746766513-161.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="183" width="800"]]

199

200

* Option 3: Limit discharge current by the cell voltage - a flag to enable correction of maximum allowable discharging current Kdv depending on minimum cell voltage;

201

* Option 3: Cell voltage x Factor – the dependence of the correction factor on minimum cell voltage.

202

203

[[image:1733746766514-686.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="215" width="800"]]

204

205

Value of the discharge current limit at given SOC, temperature, contactors temperature and minimum cell voltage is calculated as follows:

206

207

Discharging current limit = Maximum discharging current × Kds × Kdc × Kdv

=== Charge ===

There are two contactors that serve charging the battery: a charging contactor and an allow charging contactor. With the help of the allow charging contactor, the BMS commands the charger to start or stop charging.

212

213

The device supports three charge control algorithms:

214

215

* charging is always allowed;

216

* charging is allowed when there is a signal “Charger connected”;

217

* charging is allowed when there is a signal “Charge request”.

218

219

If the "**Always on**" algorithm is selected, the charging contactor and the allow charging contactor are always closed. If at least one of the errors appears:

* Overvoltage;

* Overcurrent;

* High temperature (CH);

224

* Low temperature (CH);

225

* HYG offline (optional);

226

* Combilift offline (optional);

227

* Spirit offline (optional);

228

* Spirit charger error (optional);

229

* Short circuit (optional);

230

* High contactor temperature (optional);

231

* CH contactor cycles error;

232

* Critical error

233

234

both contactors are open (no current flows).

235

236

When the algorithm "**On Charger connected**" is selected, the control is performed as follows:

237

238

* If there is a signal “Charger connected” and there are no errors (see the list above), then through the delay time T,,on,, the charging contactor and the allow charging contactor close;

239

* If the signal “Charger connected” disappears, the allow charging contactor opens and after the delay time T,,off,, the charging contactor opens;

240

* If in the process of charging the voltage on the cell exceeds the “Ready to charge” level, the allow charging contactor opens (while the charging contactor remains closed);

241

* If errors in the list above occur the charging contactor and allow charging contactor open.

242

243

When the "**On Charge request**" algorithm selected, the control is performed as follows:

244

245

* If there is a signal “Charge request” and there are no errors (see the list above), then through the delay time T,,on,, the charging contactor and the allow charging contactor close;

246

* If the signal “Charge request” disappears, the allow charging contactor opens and after the delay time T,,off,, the charging contactor opens;

247

* If in the process of charging the voltage on the cell exceeds the “Ready to charge” level, the allow charging contactor opens (while the charging contactor remains closed);

248

* If errors in the list above occur the charging contactor and allow charging contactor open.

249

250

(% class="box infomessage" %)

251

(((

252

Note: when errors occur in the system, the **charging **contactor opens either immediately or with the delay T,,off,, (depends on the settings described below).

253

)))

254

255

When the power down request occurs, the allow charging contactor opens immediately and the charging contactor opens after the delay T,,off,,. Reclosing the charging contactor and allow charging contactor is performed if the power down request is removed.

256

257

To change the parameters of the battery charge control algorithm, select the "Control → Charge" section:

258

259

[[image:1733746766516-845.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="319" width="800"]]

In this section:

* Enable – a flag to activate the charge control;

264

* Algorithm:

265

** Always on – charging is always allowed;

266

** On charger connected – charging is allowed when there is a signal “Charger connected”;

267

** On charge request – charging is allowed when there is a signal “Charge request”;

268

* Current corresponding to charging – a current level to generate the "Charging current present" signal, A;

269

* Current corresponding to no charging – a current level to clear the "Charging current present" signal, A;

270

* Delay before starting charging – a time delay T,,on,, before closing the charging contactor and the allow charging contactor, millisecond;

271

* Delay before stopping charging – a time delay T,,off,, before opening the charging contactor, millisecond;

272

* Use custom delays before stopping charging (on errors) – a flag to enable manual settings of time delays T,,off,, for specific errors;

273

* Custom delay: <error> – specific error delay, millisecond;

274

* Switch off the charging contactor on errors without delay – a flag to protectively open the charging contactor without a delay. In the opposite case, when an error is detected, the charging contactor opens always with the delay “Delay before stopping charging”;

275

* Control the precharging contactor – a flag that allows control of the precharging contactor;

276

* Voltage to clear the “Ready to charge” – a threshold voltage level on the cell, V; if the voltage of any cell is above this level, the “Ready to charge” (hence, the “Allow charging”) signal is cleared;

277

* Voltage to reset the “Ready to charge” – a tolerant voltage level on the cell, V; if all cell voltages are below the tolerant level, the “Ready to charge” (hence, the “Allow charging”) signal is set;

278

* Delay before recharging – a time after which the previously opened the allow charging contactor closes again, minute; to disable the operation by timeout set "Delay before recharging" to 0.

279

280

(% class="box infomessage" %)

281

(((

282

Note – The allow charging contactor closes under two independent conditions: 1) the voltage on the cells reaches the “Voltage to reset the “Ready to charge"” level and 2) the "Delay before recharging" time has passed since the opening of the allow charging contactor.

)))

=== Discharge ===

The device controls the discharging contactor to connect battery to the load.

288

289

The device supports three algorithms to control battery discharging:

290

291

* load is always connected;

292

* load is connected when there is no signal “Charger connected”;

293

* load is connected when there is signal “Discharge request”.

294

295

When the algorithm "**Always on**" is selected, the discharging contactor is always closed. If at least one of the errors appears:

296

297

* Undervoltage;

298

* Overvoltage (optional);

299

* Overcurrent;

300

* High temperature (DCH);

301

* Low temperature (DCH) (optional);

302

* HYG offline (optional);

303

* Combilift offline (optional);

304

* Spirit offline (optional);

305

* Spirit charger error (optional);

306

* Short circuit (optional);

307

* High contactor temperature (optional);

308

* DCH contactor cycles error;

309

* Critical error

310

311

the discharging contactor opens.

312

313

If the algorithm "**On Charger disconnected**" is selected, the control is performed as follows:

314

315

* if there is no signal “Charger connected”, the charging contactor is opened and there are no errors (see the list above), then through the delay time T,,on,, the discharging contactor closes;

316

* If the signal “Charger connected” appears or errors occur (see the list above), then after the delay time T,,off,, the discharging contactor opens.

317

318

When the "**On Discharge request**" algorithm selected, the control is performed as follows:

319

320

* if there is signal “Discharge request”, the charging contactor is opened and there are no errors (see the list above), then through the delay time T,,on,, the discharging contactor closes;

321

* If the signal “Discharge request” disappears or errors occur (see the list above), then after the delay time T,,off,, the discharging contactor opens.

322

323

(% class="box infomessage" %)

324

(((

325

Note: in case of errors in the system operation, the opening of the **discharging **contactor is performed either immediately or with a delay T,,off,, (depends on the settings described below).

326

)))

327

328

The device supports controlling the precharging contactor. The duration of switching on the precharging contactor before closing the discharging (load) contactor is adjusted.

329

330

When the power down request occurs, the discharging contactor opens after delay T,,off,,. Reclosing the discharging contactor is performed if the power down request is removed.

331

332

To change the parameters of the battery discharge control algorithm, select the "Control → Discharge" section:

333

334

[[image:1733746885414-479.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="319" width="800"]]

In this section:

* Enable – a flag to activate the discharge control;

339

* Algorithm:

340

** Always on – load is always connected;

341

** On charger disconnected – load is connected when there is no signal “Charger connected”;

342

** On discharge request – load is connected when there is signal “Discharge request”;

343

* Current corresponding to discharging – a current level to generate the "Discharging current present" signal, А;

344

* Current indicating no discharging – a current level to clear the "Discharging current present" signal, А;

345

* Delay before starting discharging – a time delay T,,on,, before closing the discharging contactor, millisecond;

346

* Delay before stopping discharging – a time delay T,,off,, before opening the discharging contactor, millisecond;

347

* Use custom delays before stopping discharging (on errors) – a flag to enable manual settings of time delays T,,off,, for specific errors;

348

* Custom delay: <error> – specific error delay, millisecond;

349

* Switch off the discharging contactor on errors without delay – a flag to protectively open the discharging contactor without a delay. In the opposite case, when an error is detected, the discharging contactor opens always with the delay “Delay before stopping discharging”.

350

* Precharge time – a duration of closing the precharge contactor before closing the discharging contactor, millisecond;

351

* Voltage to clear the “Ready to discharge” – a threshold voltage level on the cell, V; if the voltage of any cell is below this level, the “Ready to discharge” signal is cleared;

352

* Voltage to reset the “Ready to discharge” – a tolerant voltage level on the cell, V; if all cells voltages are above the tolerant level, the “Ready to discharge” signal is set;

353

354

=== Charge/Discharge ===

355

356

The BMS Mini device can control the charging/discharging contactor that is used to both charge and discharge the battery.

357

358

The charging/discharging contactor combines algorithms of charging and discharging contactor. It behaves as a charging contactor when «Charge request» or «Charger connected» are set, otherwise – as a discharging contactor.

359

360

The charging/discharging contactor control is configured in the “Control – Charge/Discharge” section:

361

362

[[image:1733746901779-991.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="95" width="800"]]In this section:

363

364

* Enable – a flag to enable the charge/discharge controller.

365

366

=== Discharge (AUX) ===

367

368

The BMS Mini device can control the power supply of external equipment using the auxiliary (AUX) discharging contactor. An example of external equipment can be an inverter that converts DC to AC to power a service laptop and other devices.

369

370

The power supply circuit of the external equipment using the auxiliary (AUX) discharging contactor is independent of the battery load circuit. The closing and opening of the auxiliary (AUX) discharging contactor is performed according to its program.

371

372

If the power supply function of the external equipment is enabled, the auxiliary (AUX) discharging contactor closes. The opening of this contactor occurs on three independent conditions:

373

374

* the battery has low SOC;

375

* the battery voltage is out of range;

376

* the battery system errors are detected.

377

378

To change the parameters of the powering of external equipment, select the "Control → Discharge (AUX)" section:

379

380

[[image:1733746932199-845.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="137" width="800"]]

In this section:

* Enable – a flag to activate the auxiliary discharge control;

385

* Switch off the discharging (AUX) contactor if the SOC is too low;

386

* Minimum SOC – a minimum SOC value, when reached, the auxiliary (AUX) discharging contactor opens, %;

387

* Tolerant SOC – a permissive SOC value, upon reaching which the auxiliary (AUX) discharging contactor re-closes, %;

388

* Switch off the discharging (AUX) contactor if the battery voltage is out of the range;

389

* Minimum voltage – minimum battery voltage, V;

390

* Maximum voltage – maximum battery voltage, V;

391

* Switch off the discharging (AUX) contactor on errors – the auxiliary (AUX) discharging contactor opens if the following errors occur: Undervoltage, Overcurrent, High temperature (DCH), Short circuit, Critical error.

392

393

=== Main contactor ===

394

395

The BMS Mini device controls the main contactor. The main contactor is usually placed in the common (minus) battery line for opening the charge and discharge circuits in a case of sealing of the charging or discharging contactors.

396

397

The main contactor closes if there are no errors from the list below:

* Overcurrent;

* Undervoltage;

* Overvoltage;

* High temperature (CH);

403

* High temperature (DCH);

404

* Unallowable charging;

405

* Critical error.

406

407

The main contactor opens if the charging and discharging contactors are opened and any of the following conditions is met:

408

409

* charging or discharging current is detected during a set time;

410

* voltage of any cell is lower than the minimum cell voltage configured in the section "Protections → Undervoltage" during a set time;

411

* voltage of any cell is greater than the maximum cell voltage configured in the section "Protections → Overvoltage" during a set time;

412

* temperature of any cell is greater than the maximum cell temperature configured in the section "Protections → High temperature" during a set time;

413

* Critical error stays on during a set time.

414

415

To change the parameters of the main contactor, select the "Control → Main contactor" section:

416

417

[[image:1733746797002-498.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="93" width="800"]]

In this section:

* Enable – a flag to enable the main contactor control;

422

* Delay before opening the contactor – a time which is used to detect conditions for opening the contactor, second;

423

* Keep the contactor open until the device is restarted – a flag for keeping the main contactor opened until the system be reset.

424

425

=== Cell balancing ===

426

427

Balancing makes the voltage of all cells be equal to the minimum cell voltage.

428

429

The following balancing rules are supported:

430

431

* only when the battery is charging (current I > 0) and some time until the battery is relaxed;

432

* when the battery is charging (current I > 0) or when the battery is in a state of relaxation;

433

* always (regardless of battery state).

434

435

A balancing resistor is connected to the cell if:

436

437

* the voltage on the cell is higher than the starting voltage of the balancing;

438

* the difference between the cell voltage and the minimum voltage among the cells of the battery is greater than the balancing deviation.

439

440

(% class="box infomessage" %)

441

(((

442

If the BMS Mini overheats, then the balancing of the cells connected to this device will not be performed.

443

)))

444

445

To change the cell balancing parameters, select the "Control → Cell balancing" section:

446

447

[[image:1733746797003-364.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="104" width="800"]]

In this section:

* Enable – a flag to enable cell balancing;

452

* Balancing rule:

453

** Balance on charge;

454

** Balance on charge or relaxed;

455

** Balance always;

456

457

[[image:1733746797004-660.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="104" width="800"]]

458

459

* Minimum cell voltage to start balancing, V;

460

* Balancing deviation, V.

=== Power down ===

The BMS Mini device can shut down itself if the battery voltage is low or the battery is idle for a long time.

465

466

Shutting down the battery system is performed according to the following conditions:

467

468

* the battery voltage is below the minimum level;

469

* the “Charger connected” signal is cleared for 60 seconds.

470

471

The BMS Mini device also shuts down the battery if it stays in the “Charging OFF”, “Discharging OFF”, “Relaxed (after charging)” or “Relaxed (after discharging)” for the set time.

472

473

To change the parameters of the power down control, select the "Control → Power down" section:

474

475

[[image:1733746797005-459.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="115" width="800"]]

In this section:

* Minimum voltage to power down – a minimum voltage level of the battery below which the BMS commands to shut down the battery, V;

480

* Idle time to power down – a time of battery inactivity after which the battery is shut down, minute;

481

* Wait the "Power up/down request" is cleared (on startup) – a flag to enable delay for clearing the “Power up/down request” signal while starting the BMS.

=== Heater ===

To change the parameters of the heater control algorithm, select the "Control → Heater" section:

486

487

[[image:1733746808496-606.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="116" width="800"]]

In this section:

* Enable – a flag to enable heater control;

492

* Minimum cell temperature, °C;

493

* Tolerant cell temperature, °C;

494

* Delay before starting the heater, millisecond;

495

* Delay before stopping the heater, millisecond;

496

* Switch off the heater on errors (Undervoltage, Overcurrent, High temperature, Short circuit or Critical error).

497

498

As a result of operating the heating algorithm, the “Heater” signal is generated.

499

500

Conditions for signal generation:

501

502

* The minimum temperature among all cells of the battery is less than the “Minimum cell temperature” value during the “Delay before starting the heater” time.

503

504

Conditions for clearing the signal:

505

506

* the minimum temperature among all cells of the battery is greater than the “Tolerant cell temperature” value during the “Delay before stopping the heater” time.

507

508

(% class="box infomessage" %)

509

(((

510

If there is the "Heater" signal, the heater contactor closes and/or a signal is output to the corresponded digital output.

)))

=== Cooler ===

To change the parameters of the cooler control algorithm, select the "Control → Cooler" section:

516

517

[[image:1733746808497-424.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="113" width="800"]]

In this section:

* Enable – a flag to enable cooler control;

522

* Maximum cell temperature, °C;

523

* Tolerant cell temperature, °C;

524

* Delay before starting the cooler, millisecond;

525

* Delay before stopping the cooler, millisecond;

526

* Switch off the cooler contactor on errors (Undervoltage, Overcurrent, Low temperature, Short circuit or Critical error).

527

528

As a result of operating the cooling algorithm, the "Cooler" signal is generated.

529

530

Conditions for signal generation:

531

532

* the maximum temperature among all cells of the battery is greater than the “Maximum cell temperature” value during the “Delay before starting the cooler” time.

533

534

Conditions for clearing the signal:

535

536

* the maximum temperature among all cells of the battery is less than the “Tolerant cell temperature” value during the “Delay before stopping the cooler” time.

537

538

(% class="box infomessage" %)

539

(((

540

If there is the "Cooler" signal, the cooler contactor closes and/or a signal is output to the corresponded digital output.

541

)))

542

543

=== Cell analysis ===

544

545

Discharge characteristics of the battery – the dependence Uocv = Uocv (DOD) – is used to determine the tabular dependence Uocv = Uocv (SOC, t °C), which is necessary for calculating the state of charge of the battery.

546

547

The BMS Mini device can automatically determine the battery discharge characteristic.

548

549

Before starting the process of determining the discharge characteristic, it is necessary to prepare a BMS:

550

551

1. Charge the battery.

552

1. Connect a resistive load to the discharging contactor, which will provide a discharge current of 0.5C (where C is the cell capacitance).

553

554

To configure parameters for determining the discharge characteristic of the battery, select the "Control → Cell analysis" section:

555

556

[[image:1733746808498-116.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="103" width="800"]]

In this section:

* Enable – a flag to enable cell analysis;

561

* Discharge step, Ah;

562

* Delta voltage – a maximum allowable voltage drop for the cell, V;

563

* Cell index – a position of the analyzed cell;

564

* Analyse the most discharged cell – a flag to analyse of the least charged cell (in this case, the value “Cell index” is ignored).

565

566

Discharge step should be set equal to

567

568

Discharge step= С/21,

569

570

where C is the cell capacity.

571

572

The discharge characteristic will be constructed for the given cell (its position is determined by the field “Cell index”).

573

574

The algorithm for determining the discharge characteristic of the battery will be started if the “Enable” flag is set. From this moment, the control of the discharge contactor is performed by this algorithm.

Algorithm steps:

1. DOD = 0.

1. Opening the discharging contactor.

580

1. Waiting for the relaxation of the battery.

581

1. Measuring Uocv = U.