Skip to Content

Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 26.1
edited by Admin
on 2024/12/11 11:21
Change comment: Renamed back-links.
To version 31.3
edited by Admin
on 2025/02/20 11:09
Change comment: There is no comment for this version

Summary

Details

Page properties
Parent
... ... @@ -1,1 +1,1 @@
1 -drafts.BMS Main 2\.1.3\. Configuration.WebHome
1 +Battery management systems.BMS Main 2\.1.3\. Configuration.WebHome
Content
... ... @@ -48,6 +48,8 @@
48 48  * Final SOC – a method of calculating the battery SOC:
49 49  ** Minimum cell SOC – the battery SOC is assumed to be equal to the minimum SOC of cells;
50 50  ** Average cell SOC – the battery SOC is assumed to be equal to the average SOC of cells;
51 +** 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;
52 +** 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;
51 51  * Scale the final SOC – flag to scale the battery SOC by the following values;
52 52  * Internal SOC corresponding to 0% – battery SOC that sets to be 0%;
53 53  * Internal SOC corresponding to 100% – battery SOC that sets to be 100%.
... ... @@ -77,8 +77,14 @@
77 77  
78 78  The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
79 79  
80 -R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,
82 +R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,)
81 81  
84 +provided that
85 +
86 +~{~{formula fontSize="SMALL"}}
87 +~| I_{stable2}-I_{stable1} | > 0.2 × Qmax
88 +~{~{/formula}}
89 +
82 82  (Q,,max,, is the maximum cell capacity),
83 83  
84 84  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.
... ... @@ -121,11 +121,20 @@
121 121  * the voltage on the cell is higher than the starting voltage of the balancing;
122 122  * the difference between the cell voltage and the minimum voltage among the cells of the battery is greater than the balancing threshold.
123 123  
124 -If the BMS Logic board overheats, then the balancing of the cells connected to this board will not be performed (see [[Logic high temperature protection>>doc:drafts.BMS Main 2\.1.3\. Configuration.3\.6 Battery protection.WebHome||anchor="HLogichightemperatureprotection"]]).
132 +A balancing resistor is disconnected from the cell if any of the following conditions are met:
125 125  
134 +* the voltage on the cell is less than the balancing stop voltage;
135 +* the difference between the voltage on the cell and the minimum voltage among the battery cells is less than the balancing stop threshold.
136 +
137 +If the BMS Logic board overheats, then the balancing of the cells connected to this board will not be performed (see [[Logic high temperature protection>>doc:Battery management systems.BMS Main 2\.1.3\. Configuration.3\.6 Battery protection.WebHome||anchor="HLogichightemperatureprotection"]]).
138 +
139 +The BMS Main 2.1 can enable the cell balancing by the external “Balancing request” signal. Balancing process will be started to cells which the voltage is higher than the balancing start voltage and the difference between the cell voltage and the minimum voltage among all the cells is greater than the balancing stop threshold.
140 +
141 +BMS Main 2.1 can force a cell balancing, if its voltage is higher than estimated value.
142 +
126 126  To change the cell balancing parameters, select the menu "Cell → Cell balancing":
127 127  
128 -[[image:1732207485773-804.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="264" width="387"]]
145 +[[image:1739812799920-892.png||alt="1732207485773-804.png" data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="264" width="387"]]
129 129  
130 130  In this section:
131 131  
... ... @@ -137,8 +137,13 @@
137 137  ** Charging;
138 138  ** Charging or relaxed;
139 139  ** Always (regardless of battery state);
157 +* Balancing condition:
158 +** Automatic – balancing will be performed automatically if needed conditions are met;
159 +** On balancing request – balancing will start only if a remote request is received. In this case cells will start to balance regardless the "Voltage deviation to start balancing" value;
140 140  * Minimum cell voltage to start balancing, V;
141 -* Balancing threshold, V;
161 +* Deviation to start balancing;
162 +* Deviation to stop balancing;
163 +* Voltage for forced balancing – if cell voltage is above this value, it will start discharging through balancing resistor;
142 142  * Start cell discharging – a command to start forced balancing of all battery cells (used for service purposes);
143 143  * Stop cell discharging – a command to stop forced balancing of all battery cells (used for service purposes).
144 144  
1739812799920-892.png
Author
... ... @@ -1,0 +1,1 @@
1 +XWiki.admin
Size
... ... @@ -1,0 +1,1 @@
1 +28.1 KB
Content