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Power lithium ion battery module group rapid charging failure evaluation method

A lithium-ion battery, fast charging technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of difficult to carry out full discharge test, difficult to calculate accurately, complicated calculation process, etc., to achieve fast evaluation speed, evaluation Small error, satisfying the effect of online state test

Inactive Publication Date: 2019-07-05
ZHEJIANG WANMA NEW ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the existing full charge (discharge) test method in the above-mentioned prior art, which takes a long time. In practical applications, the full discharge test is difficult to carry out; The characteristic evaluation strategy needs to calculate the current value, voltage value and temperature value, so as to extract and calculate the current characteristics, voltage characteristics and temperature characteristics of the lithium battery. Many algorithms are used, and the calculation process is complicated, and it is difficult to calculate accurately. A method for evaluating the rapid charging failure of power lithium-ion battery modules is provided

Method used

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  • Power lithium ion battery module group rapid charging failure evaluation method
  • Power lithium ion battery module group rapid charging failure evaluation method
  • Power lithium ion battery module group rapid charging failure evaluation method

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Embodiment 1

[0033] A power lithium-ion battery module rapid charging failure evaluation method, comprising the following steps, step 1, charging or discharging the battery pack for a short period of time; in step 1, if the battery pack after charging is used for fast charging failure evaluation, Select battery pack SOC range 30-70%. In step 1, charge or discharge the battery pack for a short time, the charge and discharge time is 1-5min, and the current is 0.5C-2C.

[0034] Step 2, recording the terminal voltage of each battery module during the charging (discharging) process;

[0035] Step 3, the relative failure rate of the battery module is evaluated by the following formula:

[0036]

[0037] u avg Indicates the average terminal voltage of each battery module at the previous moment when charging and discharging stopped,

[0038] u R Indicates the terminal voltage of the battery module to be evaluated at the previous moment when charging and discharging stopped,

[0039] u avg...

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Abstract

The invention relates to a power lithium ion battery module group rapid charging failure evaluation method. A deficiency in the prior art is overcome. The method comprises the following steps of step1, carrying out short time charging or discharging operation on a battery pack; step2, recording a voltage of each battery module group end during a charging (discharging) process; step3, evaluating arelative failure rate of a battery module group through a formula; and step4, according to a lambda value, evaluating rapid charging efficiency of the power lithium ion battery module group.

Description

technical field [0001] The invention relates to a battery evaluation method, in particular to a power lithium-ion battery module rapid charging failure evaluation method. Background technique [0002] In the field of energy storage and new energy vehicles, according to the existing battery technology level and application requirements, it is generally necessary to use a battery pack composed of several or even hundreds of single cells to meet the application requirements. Due to the existence of the inconsistency of each single battery, the performance of each single battery will be enlarged during the working process of the battery pack, and the aging of the battery will be accelerated. Especially under fast charging and discharging conditions, the inconsistency caused by the performance difference of the single battery is intensified, and the internal resistance of the battery with poor performance increases, resulting in accelerated deterioration, and at the same time cau...

Claims

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Application Information

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IPC IPC(8): G01R31/367G01R31/392
Inventor 何若虚杨涛韦珍谢长淮高云芳徐新
Owner ZHEJIANG WANMA NEW ENERGY