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Electric vehicle battery pack OCV-SOC curve correction circuit convenient to operate, and method thereof

An OCV-SOC, easy-to-operate technology, applied in secondary battery repair/maintenance, etc., can solve problems such as difficult SOC value calibration, and achieve the effect of easy implementation, improved convenience and economy, and simple method

Active Publication Date: 2013-08-21
SHANGHAI CENAT NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem of difficult SOC value calibration in the prior art, and to propose a conveniently operated electric vehicle battery pack OCV-SOC curve correction circuit and method by using an electric vehicle vehicle battery or an external household power supply

Method used

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  • Electric vehicle battery pack OCV-SOC curve correction circuit convenient to operate, and method thereof
  • Electric vehicle battery pack OCV-SOC curve correction circuit convenient to operate, and method thereof
  • Electric vehicle battery pack OCV-SOC curve correction circuit convenient to operate, and method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] This embodiment adopts the circuit structure of the above-mentioned AC / DC module, and its correction method is the following steps in order,

[0031] (1) Determine the battery module with the worst operating condition in the battery pack: According to the statistics of the battery management system from the last OCV-SOC correction to this revision, it is concluded that the battery module with the most discharge cut-off times when the battery pack is discharged is the 100th battery modules, that is, the 100th battery module is determined to be the battery module with the worst operating condition.

[0032] (2) Carry out charging and discharging tests on the worst battery modules respectively, and obtain the measured values ​​used to calculate the OCV-SOC curve during the test, such as voltage, temperature and current values: the worst battery module first Carry out a charging test, and record the measured value used to calculate the OCV-SOC curve during the test through ...

Embodiment 2

[0040] This embodiment adopts the circuit structure of the above-mentioned DC / DC module, and its correction method is the following steps in order,

[0041] (1) Use the battery management system to find out that the battery module that cut off first when the battery pack was discharged last time is the first battery module, that is, determine that the first battery module is the battery module with the worst operating condition.

[0042] (2) First, close the first and second test switches to connect the first battery module and DC / DC module. Then, start the external power supply to conduct a charge and discharge test on the first battery, and record the voltage, current and temperature values ​​during the test charging process through the battery management system.

[0043] (3) Calculate the OCV-SOC curve of the worst battery module based on the measured value obtained in step 2 according to the OCV-SOC formula.

[0044] (4) According to the OCV-SOC curve relationship of the ...

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Abstract

An electric vehicle battery pack OCV-SOC curve correction circuit convenient to operate is characterized in that the method comprises the following steps: 1, determining a battery module having a worst running state in a battery pack; 2, respectively carrying out charging and discharging tests of the battery module having a worst state, and obtaining measuring values used for calculating to obtain an OCV-SOC curve in the measuring process, such as, voltage values, temperature values and current values; 3, calculating according to the measuring values obtained in step 2 to obtain the OCV-SOC curve of the battery module having a worst state; and 4, correcting through a battery management system according to the OCV-SOC curve of the battery module having a worst state or afresh calculating to obtain the SOC value of the battery pack. The method has the advantages of simplicity, easy implementation, no need of a professional place or a professional test tool or apparatus of a user, accurate and rapid correction of the SOC value, and substantial increase of the use convenience and economy of electric automobiles.

Description

Technical field [0001] The invention involves the correction of the remaining power of the SOC (StateOfcharge) in electric vehicles, especially a correction circuit and method of an OCV-SOC curve for the convenient operation of an OCV-SOC curve. Background technique [0002] With the sharp deterioration of the global environment and the increasingly tight energy sources, electric vehicles are becoming more and more valued and favored by people.The power battery is the energy source of electric vehicles, which plays a decisive role in the overall performance of the vehicle and is the core part of electric vehicles.Among them, the battery pack SOC is an important parameter to characterize the energy margin of the power battery pack. It is a key instruction for the continuous mileage of electric vehicles. To accurately estimate the SOC of the battery system, it can effectively manage the battery, Extend the life of the battery.Therefore, how to accurately estimate the SOC of the bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42
CPCY02E60/10
Inventor 和祥运邓亚明陈中军陈沥强陈慧珺
Owner SHANGHAI CENAT NEW ENERGY
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