Power battery SOC (state of charge) estimation method under working condition environment

A power battery and working condition technology, which is applied in the direction of measuring electricity, measuring electrical variables, and testing electrical devices in transportation, etc. It can solve the problems of inaccurate calibration of battery available capacity and errors in estimation, and achieve rapid correction and accurate estimation Effect

Active Publication Date: 2019-04-23
ZHEJIANG LEAPMOTOR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problem of inaccurate battery available capacity calibration and estimation errors in battery SOC estimation in the prior art, and provides a power battery SOC estimation method under working conditions

Method used

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  • Power battery SOC (state of charge) estimation method under working condition environment
  • Power battery SOC (state of charge) estimation method under working condition environment
  • Power battery SOC (state of charge) estimation method under working condition environment

Examples

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Embodiment

[0045] In this embodiment, a method for estimating the SOC of a power battery in a working environment, such as figure 1 As shown, the steps include,

[0046] S0. The battery system is powered on, and the battery system performs a power-on self-check to collect information such as battery temperature and voltage;

[0047] Judge whether the battery system data is stable, if it is unstable, return to continue self-test, if it is stable, go to the next step.

[0048] S1. Calibrate the battery capacity at the initial power-on temperature and substitute it into the coulomb calculation; the specific process is as follows figure 2 Shown, including:

[0049] S11. According to the temperature rise data of the battery system under working conditions, such as Figure 4 As shown, obtain the temperature rise values ​​during the SOC conversion process greater than 30% in the figure, and calculate the average value of these temperature rise values;

[0050] S12. Add the initial temperature of the ba...

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Abstract

The invention discloses a powder battery SOC (state of charge) estimation method under a working condition environment. The method solves the problems that battery available capacity calibration is not precise when battery SOC estimation is conducted, and errors occur in the estimation process. The method comprises the steps that the battery capacity is calibrated under the working condition; battery SOC-OCV (open circuit voltage) curve discrete linear query calibration is conducted; the error correction ratio is increased; and the estimation errors are rapidly corrected at intervals. The method provided by the invention can calibrate the initial capacity of the battery according to the temperature change conditions of the working condition environment, ensures SOC estimation made by a battery system to be more precise under the working condition environment, and corrects errors in real time in the estimation process, thus rapid elimination of the errors is completed, and SOC estimation can be further precise.

Description

Technical field [0001] The invention relates to the technical field of batteries, in particular to a method for estimating the SOC of a power battery in a working environment. Background technique [0002] With the development of electric vehicles, battery management systems (BMS) have also been widely used. In order to give full play to the power performance of the battery system, improve the safety of its use, prevent battery overcharge and overdischarge, extend battery life, optimize driving and improve the performance of electric vehicles, the BMS system needs to charge the battery That is, SOC is accurately estimated. SOC is an important parameter used to describe the charging and discharging capacity of the battery during use. The current battery SOC estimation strategies mainly include: open circuit voltage method, ampere-hour measurement method, artificial neural network method, Kalman filter method, etc. These methods are based on accurately knowing the available capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/367G01R31/374G01R31/388G01R31/396
CPCG01R31/006
Inventor 胡青松杨龙雨宋忆宁
Owner ZHEJIANG LEAPMOTOR TECH CO LTD
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