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Changes for page 3.3 Control

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Summary

Details

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12 12  
13 13  In this section:
14 14  
15 -* **Cell capacity** – nominal capacity of cells, Ah;
16 -* **Cell resistance** – nominal (maximum) internal resistance of the cells, Ohm;
17 -* **Connection of cells:**
18 -** **Serial **– all cells are connected in series in a single string.
19 -** **Parallel-Serial **– cells are grouped in parallel and serial items;
20 -* **Parallel-Serial: Number of Logic devices in a chain**;
21 -* **Parallel-Serial: Number of parallel chains in a block**;
22 -* **Parallel-Serial: Number of serial blocks in a string**;
23 -* **Relax time (after charging)** – a relaxation time after charging, second;
24 -* **Relax time (atfer discharging)** – a relaxation time after discharging, second;
25 -* **Reset SOC** – a command to reset cells state of charge;
26 -* **Reset resistance** – a command to reset cells resistance;
27 -* **Reset capacity** – a command to reset cells capacity;
28 -* **Method of calculating the battery voltage***:
29 -** **Summation of cell voltages** – the overall voltage is calculated as on sum of all cells in the battery;
30 -** **Using voltage before contactors** – the overall voltage is estimated as voltage before contactors measured by BMS.
15 +* Cell capacity – nominal capacity of cells, Ah;
16 +* Cell resistance – nominal (maximum) internal resistance of the cells, Ohm;
17 +* Relax time (after charging) – a relaxation time after charging, second;
18 +* Relax time (atfer discharging) – a relaxation time after discharging, second;
19 +* Reset parameters – a command to reset cells state of charge, capacity, and resistance;
20 +* Method of calculating the battery voltage:
21 +** Summation of cell voltages – the overall voltage is calculated as on sum of all cells in the battery;
22 +** Using voltage before contactors – the overall voltage is estimated as voltage before contactors measured by BMS.
31 31  
32 -The **"Parallel-Serial"** connection works as follows: a bunch of serial connected Logics are grouped into chains. A bunch of parallel connected chains are grouped to blocks. A bunch of serial connected blocks are grouped into string. By configuring the corresponding settings it is possible to create a complex string configuration. Current through each chain will be estimated as a fraction of overall current accordingly to the number of chains in a block.
24 +The values “Capacity” and “Resistance” are used to calculate the SOC of cells and the battery.
33 33  
34 -The values **“Capacity”** and **“Resistance”** are used to calculate the SOC of cells and the battery.
26 +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.
35 35  
36 -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.
28 +The “Reset parameters” will reset:
37 37  
38 -The** “Reset parameters”** will reset:
39 -
40 40  * 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);
41 41  * cell resistance to “Cell resistance” value;
42 42  * battery capacity to “Cell capacity” value.
43 43  
44 -The **“Reset parameters”** command is used for starting-up and adjustment of the battery.
34 +The “Reset parameters” command is used for starting-up and adjustment of the battery.
45 45  
46 46  === SOC estimation ===
47 47  
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112 112  * Ignore the linear zone – a flag to ignore linear SOC zone while correction (recommended to be unset);
113 113  * Last correction timestamp – time when last correction was made.
114 114  
115 -=== SOH estimation ===
116 -
117 -The BMS Main 3 device calculates the state of health of the battery (SOH) using two algorithms:
118 -
119 -* By effective capacity;
120 -* By total charge-.
121 -
122 -In "By effective capacity" mode SOH is calculated as a ratio of effective capacity to nominal capacity. Effective capacity is estimated to DOD value when battery SOC reaches 0%, so SOH is recalculated each full battery discharge.
123 -
124 -In "By total charge-" mode SOH is calculated as a linear function of "Total charge-" counter. While "Total charge-" constantly increases during battery operation, SOH will be linearly decrease at the same time. This mode requires a confirmed data about cell health depending of amount of discharge rate to configure the linear function.
125 -
126 -To configure parameters for battery state of health calculation, select the "Control → SOH correction" section:
127 -
128 -[[image:1765447975228-766.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="96" width="800"]]In this section:
129 -
130 -* Algorithm:
131 -** By effective capacity;
132 -** By total charge-;
133 -* Total charge: Charge- –  total amount of charge- for expected SOH;
134 -* Total charge: SOH –  expected SOH value at the total amount of charge-.
135 -
136 136  === Resistance estimation ===
137 137  
138 138  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
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387 387  
388 388  To change the parameters of charging process status, select the "Control → Charging status" section:
389 389  
390 -[[image:1771432488941-251.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="154" width="800"]]
359 +[[image:1750261016583-434.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="114" width="800"]]
391 391  
392 392  In this section:
393 393  
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395 395  * Current to clear the "Charging current present" – a current level to clear the "Charging current present" signal, A;
396 396  * Voltage to clear the “Ready to charge” – a threshold U,,ocv,, (corrected due to current and cell resistance) 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;
397 397  * Voltage to reset the “Ready to charge” – a tolerant U,,ocv,, (corrected due to current and cell resistance) 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;
398 -* Use actual voltage to generate the "Ready to charge" signal – a flag to disable voltage correction for "Ready to charge" signal;
399 399  * Treat negative currents as zero currents for generating the "Ready to charge" signal – a flag to disable voltage correction for "Ready to charge" signal at discharging current;
400 400  * 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;
401 -* Check the 'Charge current limit' value to generate the 'Ready to charge' – a flag to enable check of "Charging current limit" to generate the "Ready to charge" signal;
402 -* Charge current limit to clear the 'Ready to charge' – a threshold charging current limit value, A; if the limit is //above //this level, the “Ready to charge” signal is cleared;
403 -* Charge current limit to set the 'Ready to charge' – a tolerant charging current limit value, A; if the limit is //below //this level, the “Ready to charge” signal is set;
404 404  * Errors 1, 2 to clear the "Ready to charge" – bitfields to choose the errors which will clear the "Ready to charge" signal.
405 405  
406 406  (% class="box infomessage" %)
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414 414  
415 415  To change the parameters of discharging process status, select the "Control → Discharging status" section:
416 416  
417 -[[image:1771431570393-551.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="155" width="800"]]
382 +[[image:1750261289590-730.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="103" width="800"]]
418 418  
419 419  In this section:
420 420  
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422 422  * Current to clear the "Discharging current present" – a current level to clear the "Discharging current present" signal, А;
423 423  * Voltage to clear the “Ready to discharge” – a threshold U,,ocv,, (corrected due to current and cell resistance) voltage level on the cell, V; if the voltage of any cell is below this level, the “Ready to discharge” signal is cleared;
424 424  * Voltage to reset the “Ready to discharge” – a tolerant U,,ocv,, (corrected due to current and cell resistance) voltage level on the cell, V; if all cells voltages are above the tolerant level, the “Ready to discharge” signal is set;
425 -* Use actual voltage to generate the "Ready to discharge" signal – a flag to disable voltage correction for "Ready to discharge" signal;
426 426  * Treat positive currents as zero currents for generating the "Ready to discharge" signal – a flag to disable voltage correction for "Ready to discharge" signal at charging current;
427 -* Check the 'Discharge current limit' value to generate the 'Ready to discharge' – a flag to enable check of "Discharging current limit" to generate the "Ready to discharge" signal;
428 -* Discharge current limit to clear the 'Ready to discharge' – a threshold discharging current limit value, A; if the limit is //above //this level, the “Ready to discharge” signal is cleared;
429 -* Discharge current limit to set the 'Ready to discharge' – a tolerant discharging current limit value, A; if the limit is //below //this level, the “Ready to discharge” signal is set;
430 -* Clear the 'Ready to discharge' signal if the 'Low SOC' signal is set;
431 431  * Errors 1, 2 to clear the "Ready to discharge" – bitfields to choose the errors which will clear the "Ready to discharge" signal.
432 432  
433 433  === Precharge ===
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