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A method of correcting power battery SOC

A power battery and SOC1 technology, applied in battery/fuel cell control devices, measuring electricity, electric vehicles, etc., can solve problems such as inaccurate SOC estimation, solve SOC errors, solve inaccurate battery characteristic parameters, and avoid time-consuming and laborious Effect

Active Publication Date: 2022-01-04
力高(山东)新能源技术股份有限公司
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AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of inaccurate SOC estimation, the present invention provides a method for correcting the SOC of a power battery

Method used

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  • A method of correcting power battery SOC
  • A method of correcting power battery SOC
  • A method of correcting power battery SOC

Examples

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Embodiment Construction

[0031] Such as figure 1 As shown, a method for correcting the SOC of a power battery includes the following steps:

[0032] S1. Open the BMS of the battery management system, and judge whether the battery is in the charging state or the discharging state according to the connection status of the charging gun. If the battery is in the charging state, enter S2, otherwise enter S8;

[0033] S2. Determine whether the battery voltage is greater than or equal to V every set time 0 , V 0 Is the battery is charged to the SOC with the specified current 0 When the voltage value, choose V 0 The principle is that V 0 SOC caused by changes 0 change is small, usually V 0 Select the voltage close to full charge, if it is judged to be true, enter S3, otherwise enter S2;

[0034] S3. Determine whether the battery SOC is greater than or equal to the SOC 0 , if the judgment is true, enter S5, otherwise enter S4; SOC 0 Set the value for the system before the step loop.

[0035] S4. Adju...

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Abstract

The present invention relates to the field of power battery management systems, and in particular to a method for correcting the SOC of a power battery. The steps of the method are: S1. Open the BMS of the battery management system, and judge whether the battery is in a charging state or a discharging state according to the connection state of the charging gun. If the battery is in the charging state, enter S2, otherwise enter S8; S2, judge whether the battery voltage is greater than or equal to V every set time 0 , if the judgment is true, enter S3, otherwise enter S2; S3, judge whether the battery SOC is greater than or equal to SOC 0 , if judged to be true, enter S5, otherwise enter S4; S4, adjust battery SOC to SOC 0 , enter step S5; S5, determine whether the battery is charged to the full charge voltage every set time period, if it is judged to be true, enter S6, otherwise enter S5; S6, according to the SOC jumps to 100% when the battery is at full charge voltage Amplitude ΔSOC, calculated SOC 1 ; S7, SOC calculated with step S6 1 Replace SOC 0 ; S8, end. The present invention realizes SOC error convergence through a closed-loop process.

Description

technical field [0001] The invention relates to the field of power battery management systems, in particular to a method for correcting the SOC of a power battery. Background technique [0002] With the popularity of electric vehicles, how to make vehicles safe and reliable and improve power performance has become an increasingly important issue. The performance of the battery depends on the SOC value of the battery. If you want to ensure the safe and stable operation of electric vehicles, avoid car crashes, provide appropriate power output, and extend battery life, you must ensure that the estimated battery SOC is accurate and reliable. At present, the most common methods for estimating the SOC of power batteries include the ampere-hour integration method, the Kalman filter method, and the parameter identification method, etc., but the battery parameters used in these methods are all fixed. With the passage of time, the battery gradually ages and the internal resistance i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/374G01R31/3828B60L58/12
CPCG01R31/374G01R31/3828B60L58/12Y02T10/70
Inventor 沈永柏王翰超王云孙艳康义尹坤李享刘欢
Owner 力高(山东)新能源技术股份有限公司