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Changes for page 3.5 Battery control

Last modified by Admin on 2025/03/10 12:50
From version 3.1
edited by Admin
on 2024/11/21 17:06
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To version 8.3
edited by Admin
on 2024/11/22 15:12
Change comment: Update document after refactoring.

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1 -drafts.bms-main-2-1.configuration.WebHome
1 +drafts.bms-main-2.configuration.WebHome
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62 62  
63 63  (% class="box infomessage" %)
64 64  (((
65 -**Note:** The allow charging relay closes under two independent conditions:
65 +**Note:** The "Allow charging" signal appears under two independent conditions:
66 66  1) the voltage on the cells reaches the Voltage to reset the “Ready to charge" level and
67 67  2) the "Delay before recharging" time has passed since the opening of the allow charging relay.
68 68  )))
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99 99  * if there is no signal “Charger connected”, the charging relay is opened and there are no errors (see the list above), then through the delay time T,,on,, the discharging relay closes;
100 100  * If the signal “Charger connected” appears or errors occur (see the list above), then after the delay time T,,off,, the discharging relay opens.
101 101  
102 -Note – In case of errors in the system operation, the opening of the discharging relay is performed either immediately or with a delay T,,off,, (depends on the settings described below).
102 +(% class="box infomessage" %)
103 +(((
104 +**Note:** In case of errors in the system operation, the opening of the discharging relay is performed either immediately or with a delay T,,off,, (depends on the settings described below).
105 +)))
103 103  
104 104  The board supports controlling the precharging relay. The duration of switching on the precharging relay before closing the discharging (load) relay is adjusted.
105 105  
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106 106  When the power down request occurs, the discharging relay opens after delay T,,off,,. Reclosing the discharging relay is performed if the power down request is removed.
107 107  
108 108  To change the parameters of the battery discharge control algorithm, select the menu "Cells → Discharging control":
112 +
113 +[[Discharge control settings>>image:1732208781932-849.png||data-xwiki-image-style-alignment="center" height="644" width="415"]]
114 +
115 +
116 +In this section:
117 +
118 +* Enable – a flag to activate the discharge control;
119 +* Discharging algorithm:
120 +** Always on – load is always connected;
121 +** On charger disconnected – load is connected when there is no signal “Charger connected”;
122 +** On discharge request – load is connected when there is a signal “Discharge request”;
123 +* Current indicating discharging – a current level to generate the "Discharging current present" signal, А;
124 +* Current indicating no discharging – a current level to clear the "Discharging current present" signal, А;
125 +* Delay before starting discharging – a time delay T,,on,, before closing the discharging relay, second;
126 +* Delay before stopping discharging – a time delay T,,off,, before opening the discharging relay, second;
127 +* Use specific delays before stopping discharging (on errors) – a flag to enable manual settings of time delays T,,off,, for specific errors;
128 +* Switch off the discharging relay on errors without delay – a flag to protectively open the discharging relay without delay. In the opposite case, when an error is detected, the discharging relay opens always with the delay “Delay before stopping discharging”.
129 +* Precharge time – a duration of closing the precharge relay before closing the discharging relay, millisecond;
130 +* Voltage to clear the “Ready to discharge” signal – 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;
131 +* Voltage to reset the “Ready to discharge” signal – a tolerant voltage level on the cell, V; if all cells voltages are above the tolerant level, the “Ready to discharge” signal is set.
132 +
133 +== 3.5.3 Discharging (AUX) control ==
134 +
135 +The BMS Main 2.x board can control the power supply of external equipment using the auxiliary (AUX) discharging relay. An example of external equipment can be an inverter that converts DC to AC to power a service laptop and other devices.
136 +
137 +The power supply circuit of the external equipment using the auxiliary (AUX) discharging relay is independent of the battery load circuit. The closing and opening of the auxiliary (AUX) discharging relay is performed according to its program.
138 +
139 +If the power supply function of the external equipment is enabled, the auxiliary (AUX) discharging relay closes. The opening of this relay occurs on three independent conditions:
140 +
141 +* the battery has low SOC;
142 +* the battery voltage is out of range;
143 +* the battery system errors are detected.
144 +
145 +To change the parameters of the powering of external equipment, select the menu "Cells → Discharging (AUX) control":
146 +
147 +[[Discharging (AUX) control settings>>image:1732208939544-710.png||data-xwiki-image-style-alignment="center" height="397" width="445"]]
148 +
149 +In this section:
150 +
151 +* Enable – a flag to activate the auxiliary discharge control;
152 +* Switch off the discharging (AUX) relay at low SOC:
153 +** Minimum SOC – a minimum SOC value, when reached, the auxiliary (AUX) discharging relay opens, %;
154 +** Tolerant SOC – a permissive SOC value, upon reaching which the auxiliary (AUX) discharging relay re-closes, %;
155 +* Switch off the discharging (AUX) relay if the battery voltage is out of the range:
156 +** Minimum voltage – minimum battery voltage, V;
157 +** Maximum voltage – maximum battery voltage, V;
158 +* Switch off the discharging (AUX) relay on errors – the auxiliary (AUX) discharging relay opens if the following errors occur: Undervoltage, Overcurrent, High temperature (discharging), Short circuit, Critical error.
159 +
160 +== 3.5.4 Charging/Discharging control ==
161 +
162 + BMS Main 2.x allows to control charging/discharging contactor that combines algorithms of charging and discharging contactor. It behaves as charging contactor when «Charge request» or «Charger connected» are set, otherwise – as discharging contactor.
163 +
164 +To change the parameters of the charging/discharging algorithm, select the menu "Cells → Charging/Discharging control":
165 +
166 +[[Charging/Discharging control settings>>image:1732209044117-558.png||data-xwiki-image-style-alignment="center" height="102" width="259"]]
167 +
168 +
169 +In this section:
170 +
171 +* Enable – a flag to enable Charging/Discharging contactor controller.
172 +
173 +== 3.5.5 Main contactor ==
174 +
175 +The BMS Main 2.x has a relay to control 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 contactor.
176 +
177 +The main contactor closes if there are no errors from the list below:
178 +
179 +* Overcurrent;
180 +* Undervoltage;
181 +* Overvoltage;
182 +* High temperature (charging);
183 +* High temperature (discharging);
184 +* Unallowable charging;
185 +* Critical error.
186 +
187 +The main contactor opens if the charging and discharging relays are opened and any of the following conditions is met:
188 +
189 +* charging or discharging current is detected during a set time;
190 +* voltage of any cell is lower than the minimum cell voltage configured in the section "Protections → Undervoltage protection" during a set time;
191 +* voltage of any cell is greater than the maximum cell voltage configured in the section "Protections → Overvoltage protection" during a set time;
192 +* temperature of any cell is greater than the maximum cell temperature configured in the section "Protections → High temperature protection" during a set time;
193 +* Critical error stays on during a set time.
194 +
195 +To change the parameters of the main contactor, select the menu "Cells → Main contactor":
196 +
197 +[[Main contactor settings>>image:1732209137414-912.png||data-xwiki-image-style-alignment="center" height="132" width="352"]]
198 +
199 +
200 +In this section:
201 +
202 +* Enable – a flag to enable the main contactor control;
203 +* Delay before opening the contactor – a time which is used to detect conditions for opening the contactor, second;
204 +* Keep the contactor open until the device is reset – a flag for keeping the main contactor opened until the system be reset.
205 +
206 +== 3.5.6 Power down control ==
207 +
208 +The BMS Main 2.x can command the BMS Power Control board to shut down the battery system if the battery voltage is low or the battery is idle for a long time. The BMS Main 2.x interacts with the BMS Power Control using the “Power down request” and the “Acknowledgement of power down” discrete signals.
209 +
210 +Shutting down the battery system is performed according to the following conditions:
211 +
212 +* the battery voltage is below the minimum level;
213 +* the “Charger connected” signal is cleared for 60 seconds.
214 +
215 +The BMS Main 2.x 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.
216 +
217 +To change the parameters of the power down control, select the menu "Cells → Power down control":
218 +
219 +[[Power down control section>>image:1732211675123-235.png||data-xwiki-image-style-alignment="center" height="198" width="402"]]
220 +
221 +
222 +In this section:
223 +
224 +* Enable – a flag to enable the power down control;
225 +* Minimum voltage – a minimum voltage level of the battery below which the BMS commands to shut down the battery, V;
226 +* Idle time – a time of battery inactivity after which the battery is shut down, second;
227 +* Wait the "Power up/down request" signal is cleared (on startup) – a flag to enable delay for clearing the “Power up/down request” signal while starting the BMS.
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