Estimation method of vehicle battery stress optical coefficient (SOC)

A technology for automobile batteries and batteries, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of inaccurate estimation of battery SOC, and achieve the effect of improving accuracy and calculation accuracy

Inactive Publication Date: 2011-08-24
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of inaccurate estimation of the existing automobile battery SOC, and propose a battery SOC estimation method that improves the estimation accuracy

Method used

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  • Estimation method of vehicle battery stress optical coefficient (SOC)
  • Estimation method of vehicle battery stress optical coefficient (SOC)
  • Estimation method of vehicle battery stress optical coefficient (SOC)

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Embodiment Construction

[0025] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0026] Such as figure 1 As shown, the method for estimating the SOC of the automobile battery includes the following steps:

[0027] a. start;

[0028] b. Judging the length of the battery storage time, if the storage time is less than the set time T0, enter step c; otherwise, enter step d;

[0029] c. Directly use the SOC when the battery stopped using last time as the SOC at this time, and enter step e;

[0030] d. Use the open circuit voltage method to obtain the SOC, and enter step g; in this step, when the battery ambient temperature exceeds the battery operating limit temperature, the SOC is 0 at this time, and the charge and discharge circuit is cut off, and the battery is prohibited from charging and discharging ...

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Abstract

The invention provides an estimation method of a vehicle battery stress optical coefficient (SOC), and belongs to the technical field of vehicle power batteries. The method solves the problems that the conventional estimation method of vehicle battery SOC is not accurate and the like. The estimation method is characterized by comprising the following steps: a, starting; b, judging the shelf time of the battery, if the shelf time is less than a set time T0, performing a step c, otherwise performing a step d; c, taking the SOC of the battery when the battery is not used last time as the SOC at the moment; d, acquiring an SOC by an open-circuit voltage method; e, judging whether the battery is in a dynamic state or not, if the battery is in a dynamic state, performing a step f, otherwise returning to the step b; f, estimating the SOC by an Ah integral method; g, correcting the SOC acquired by estimation; and h, finishing. The method provided by the invention has the advantages that during correction of the SOC, various factors influencing the SOC are taken into full consideration, so the accuracy of SOC can be improved.

Description

technical field [0001] The invention belongs to the technical field of automobile power batteries, and relates to a method for estimating the SOC of an automobile battery. Background technique [0002] The battery is the most commonly used energy storage component in new energy vehicles. The performance of the battery plays a decisive role in the performance of the vehicle. The quality of the battery management system directly affects the life of the battery and the performance of the vehicle. SOC is one of the most important parameters of the battery management system. It is necessary to control the SOC within a reasonable range for rational use of batteries, improvement of battery life, improvement of power utilization, and extension of vehicle driving range. Therefore, the accuracy of SOC estimation is very important. At present, the estimation of SOC is a difficult point at home and abroad. Contents of the invention [0003] The object of the present invention is to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 陈华明孙文凯金启前由毅丁勇赵福全
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD
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