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Changes for page 3.3 Control

Last modified by Admin on 2026/04/30 15:58
From version 53.1
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on 2026/04/27 12:53
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To version 55.2
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on 2026/04/30 15:40
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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 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.
15 +* **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 (after discharging)** – the relaxation time after discharging, second;
19 +* **Reset parameters **– a command to reset cells state of charge, capacity, and resistance.
20 20  
21 -The values “Capacity” and “Resistance” are used to calculate the SOC of cells and the battery.
21 +The values “**Capacity**” and “**Resistance**” are used to calculate the SOC of cells and the battery.
22 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.
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 24  
25 -The “Reset parameters” will reset:
25 +The “**Reset parameters**”  is used for starting-up and adjustment of the battery and will reset:
26 26  
27 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 28  * cell resistance to “Cell resistance” value;
29 29  * battery capacity to “Cell capacity” value.
30 30  
31 -The “Reset parameters” command is used for starting-up and adjustment of the battery.
32 -
33 33  === SOC estimation ===
34 34  
35 -The BMS Mini device calculates the state of charge of the battery (SOC) using two algorithms:
33 +The BMS Mini device calculates the state of charge (SOC) of each cell by using following algorithms:
36 36  
37 -* by open circuit voltage;
38 -* by voltage and current.
35 +The **“Voltage”** SOC calculation algorithm calculates cells SOC based on the tabular dependence Uocv = Uocv(SOC, t °C).
39 39  
40 -It is recommended to use the algorithm of calculation of SOC by voltage and current.
37 +The **“Current and voltage (simplified)”** SOC calculation algorithm works as follows:
41 41  
42 -To change the estimation algorithm for calculating the battery SOC, select the "Control → SOC estimation → Algorithm" section:
39 +* if I = 0, the battery is in the state of relaxation and the cell voltage Uocv is outside the [U,,ocv[point 1],,; U,,ocv[point 2],,], the SOC calculation is based on the tabular dependency Uocv = Uocv(SOC, t °C);
40 +* in any other cases, the SOC value is proportional to the charge (coulomb) passed through the battery (current time integral).
43 43  
42 +The **“Current and voltage (enhanced)” **SOC calculation algorithm differs from the simplified algorithm by online correction of the effective capacity. When using this algorithm, it is necessary to fine tune the tabular dependence Uocv = Uocv (SOC, t °C).
43 +
44 +To change the algorithm for calculating the SOC, select the "Control → SOC estimation" section:
45 +
44 44  [[image:1733746733477-590.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="166" width="800"]]
45 45  
46 46  The following estimation algorithms supported:
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62 62  
63 63  [[image:1733746733478-414.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="167" width="800"]]
64 64  
65 -The following battery Final SOC calculation methods are supported:
67 +In this section:
66 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 -* Min-Max SOC – the battery SOC is calculated based on the minimum and maximum SOC of the cells. Final SOC will be a) 100% if any cell has 100% SOC, b) 0% if any cell has 0% SOC;
70 -* Max-Min SOC – the battery SOC is calculated based on the minimum and maximum SOC of the cells. Final SOC will be a) 100% if all cells have 100% SOC, b) 0% if all cells have 0% SOC.
69 +* **Algorithm:**
70 +** **Voltage **– by open circuit voltage;
71 +** **Current and voltage (simplified)** – recommended for LFP cells;
72 +** **Current and voltage (enhanced)** – recommended for NMC cells:
73 +* **Final SOC** – method of calculating overall SOC of battery:
74 +** **Minimal SOC** – the battery SOC is assumed to be the minimum SOC among the cells;
75 +** **Average SOC** – the battery SOC is taken equal to the arithmetic average of the cell SOC;
76 +** **Min-Max SOC** – the battery SOC is calculated based on the minimum and maximum SOC of the cells (recommended). Final SOC will be a) 100% if __any cell__ has 100% SOC, b) 0% if __any cell__ has 0% SOC;
77 +** **Max-Min SOC** – the battery SOC is calculated based on the minimum and maximum SOC of the cells. Final SOC will be a) 100% if __all cells__ have 100% SOC, b) 0% if __all// //cells__ have 0% SOC.
78 +* **Scale the final SOC** – a flag to scale the battery SOC by the following values;
79 +* **SOC corresponding to 0%** – the battery SOC that sets to be 0%;
80 +* **SOC corresponding to 100%** – the battery SOC that sets to be 100%.
81 +* **Uocv (open-circuit voltage) table** – the dependence of the cell open circuit voltage Uocv on SOC and the cell temperature (selected for specific batteries);
82 +* **Linear zone** - linear zone of the Uocv = Uocv(SOC, t°C) dependency, inside which the cell voltage changes insignificantly:
83 +** **Linear zone: point 1** – starting point of the Uocv linear zone;
84 +** **Linear zone: point 2** – ending point of the Uocv linear zone;
85 +* **Coulomb counting correction (temperature)** – the dependence of battery capacity on temperature;
86 +* **Coulomb counting correction (cycles)** – the dependence of battery capacity on the number of charge-discharge cycles.
71 71  
72 -Other parameters:
73 -
74 -* Scale the final SOC – a flag to scale the battery SOC by the following values;
75 -* SOC corresponding to 0% – the battery SOC that sets to be 0%;
76 -* SOC corresponding to 100% – the battery SOC that sets to be 100%.
77 -* Uocv (open-circuit voltage) table – the dependence of the cell open circuit voltage Uocv on SOC and the cell temperature (selected for specific batteries);
78 -* Linear zone - linear zone of the Uocv = Uocv(SOC, t°C) dependency, inside which the cell voltage changes insignificantly:
79 -** Linear zone: point 1 – starting point of the Uocv linear zone;
80 -** Linear zone: point 2 – ending point of the Uocv linear zone;
81 -* Coulomb counting correction (temperature) – the dependence of battery capacity on temperature;
82 -* Coulomb counting correction (cycles) – the dependence of battery capacity on the number of charge-discharge cycles.
83 -
84 84  === SOC correction ===
85 85  
86 86  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"]]).
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