A method for smooth correction of lithium battery charging SOC
A lithium battery, -SOC technology, applied in the field of smooth correction of lithium battery charging SOC, can solve the problems of reducing user experience, driver distrust, etc., to achieve the effect of improving user experience, ensuring reliability, and eliminating distrust
Active Publication Date: 2021-12-07
合肥力高动力科技有限公司
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Problems solved by technology
Due to calculation errors, when the full charge voltage is reached, the real SOC may jump to 100%, and because the displayed SOC will also become 100% at this time, there will be a jump at the end of charging, which will reduce the user experience and cause the driver's distrust
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[0017] Such as figure 1 As shown, a method for smoothly correcting the charging SOC of a lithium battery, the steps are as follows:
[0018] S1. The battery management system BMS judges whether the battery is in the charging state according to the charging connection state of the battery. If the battery is in the charging state, enter step S2, otherwise end directly;
[0019] S2. Correcting the battery display SOC according to the voltage-SOC correspondence table.
[0020] The method for obtaining the voltage-SOC correspondence table is as follows:
[0021] Assume that the charge and discharge cut-off voltage of the battery is V 0 and V M , then the SOC of the Nth point is SOC N = N / M, voltage V N The calculation formula is
[0022]
[0023] The part of the voltage-SOC correspondence table calculated by the above method (V N ,SOC N ) value pairs, from M to (V N ,SOC N ) to get the last P pair data and save it. In this scheme, M can take any value. In order to cit...
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A method for smoothly correcting the charging SOC of a lithium battery. The steps for correcting the battery display SOC are as follows: S21. The battery management system BMS judges whether the battery voltage reaches V N , if reaching V N Then enter S22, otherwise enter S21; S22, judge whether the battery display SOC at this time reaches the SOC N , if the SOC is not reached N Then enter S23, otherwise enter S24; S23, quickly correct the battery display SOC to SOC N , enter S25; S24, set the battery display SOC change speed to 1 / 2 of the real SOC change speed; S25, judge whether the battery display SOC reaches the set value, if not, enter S21, if yes, judge the battery at intervals Whether it reaches the full charge voltage, if so, set the display SOC to 100% as the display SOC at the next moment, otherwise the display SOC remains at the set value. This invention solves the problem of SOC jumping at the charging end, and end users will see that the SOC rises smoothly, and the SOC is just 100% when the cut-off voltage is reached, eliminating the user's distrust of the SOC.
Description
technical field [0001] The invention relates to the field of battery management systems, in particular to a method for smoothly correcting the charging SOC of a lithium battery. Background technique [0002] In electric vehicle related technologies, the accurate estimation of lithium battery state of charge (State of Charge, SOC) is a key, and the driving behavior of the driver mainly depends on the current SOC of the battery system. Generally speaking, when estimating the SOC of a battery system, multiple estimation methods are often combined, such as the estimation method combining ampere-hour integration and OCV calibration: when the battery is running, use ampere-hour integration to calculate the current SOC in real time, and use it when the battery is fully static OCV calibration re-estimates the initial SOC value. Since the SOC obtained by OCV calibration and ampere-hour integration will not be exactly the same, the SOC will jump every time OCV is calibrated. In the ...
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IPC IPC(8): G01R31/374G01R31/3828B60L58/12
CPCB60L58/12G01R31/374G01R31/3828Y02T10/70
Inventor 沈永柏王翰超王云姜明军孙艳康义江梓贤刘欢
Owner 合肥力高动力科技有限公司