A kind of battery SOC calibration method

A calibration method, OCV-SOC technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., to achieve the effect of increasing calibration probability, wide application range, and improving calibration accuracy

Active Publication Date: 2022-05-17
ZHEJIANG LEAPMOTOR TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

This method is not suitable for batteries with a platform voltage range, such as lithium iron phosphate batteries, which may easily cause large calibration errors due to factors such as the accuracy of the OCV-SOC relationship table and the acquisition voltage and temperature.

Method used

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  • A kind of battery SOC calibration method
  • A kind of battery SOC calibration method
  • A kind of battery SOC calibration method

Examples

Experimental program
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Embodiment

[0033] This embodiment proposes a battery SOC calibration method, refer to figure 1 , including the following steps:

[0034] After the battery cell needs to stand for at least 6 hours, perform the following steps:

[0035] S1, determine whether there is a platform area, if there is, start the OCV-SOC table look-up calibration, and then proceed to step S2, otherwise directly proceed to step S2;

[0036] refer to figure 2 , Step S1 specifically includes: the current acquisition voltage is Voltage, the current acquisition voltage is increased by 1mv to Voltage+1, and the current voltage is decreased by 1mv to Voltage-1, and the OCV-SOC check is performed on Voltage, Voltage+1, and Voltage-1 at the current temperature respectively. Get the corresponding SOCcur, SOCcur+1, and SOCcur-1 from the table. If SOCcur+1-SOCcur≤1% and SOCcur-SOCcur-1≤1%, it is judged that the current voltage is in a non-platform area, and the OCV-SOC look-up table calibration is performed. Current SOC=...

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Abstract

The present invention proposes a battery SOC calibration method, including the following steps: S1, judge whether there is a platform area under the condition of static calibration, if it exists, start OCV-SOC table look-up calibration, and then proceed to step S2, otherwise directly proceed to step S2; S2 , to determine whether it is the charging mode, if so, read the current SOC value, charging current, charging time and the highest charging cell voltage, and then go to step S3, if not, go to S2; S3, perform static voltage slope calibration; S4, limit growth The rate is calibrated; S5, the charging terminal voltage is calibrated. The present invention performs SOC calibration through three methods of Dq / Dv relationship during charging, charging terminal voltage, and static voltage slope judgment, avoiding calibration errors caused by the platform area of ​​the battery, and is suitable for SOC calibration of different types of batteries.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery SOC calibration method. Background technique [0002] As the market has higher and higher requirements for new energy vehicles, energy storage, and 3C electronic products, batteries, as one of the key components, have attracted much attention. SOC (State of Charge, state of charge) estimation is one of the key technologies of battery management. It is used to determine the remaining state of charge of the battery. Inaccurate estimation of its value may easily cause battery overcharge, overdischarge, and reduce battery life. [0003] The SOC estimation accuracy is mainly affected by two aspects, one is the SOC process calculation accuracy, and the other is the SOC calibration accuracy. The calculation accuracy of SOC process can be improved by increasing the acquisition accuracy and calculation algorithm of voltage, current and temperature. SOC calibration is mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/3842
CPCG01R31/3842Y02E60/10
Inventor 李志飞高科杰宋忆宁王志方
Owner ZHEJIANG LEAPMOTOR TECH CO LTD
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