Method for predicting battery life

A technology of battery life and battery, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem that it is difficult to ensure the reliability of qualitative analysis results

Pending Publication Date: 2022-03-08
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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Problems solved by technology

However, there are many factors affecting battery side reactions, it is difficult to guarantee the reliability of the qualitative analysis results

Method used

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  • Method for predicting battery life
  • Method for predicting battery life

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Embodiment Construction

[0021] Embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0022] According to a first aspect of the invention, the invention proposes a method for predicting battery life. According to an embodiment of the present invention, the method includes: (1) testing the rated capacity V of the battery at different temperatures n ;(2) After charging the battery to the open circuit voltage value corresponding to a certain SOC value, use a constant voltage source to maintain the voltage of the battery at this voltage value, and then the charging current of the battery will gradually decrease to a constant value, and record the voltage at different temperatures The constant current value I corresponding to a specific SOC value n (3) Determine the service coefficient η of the battery at different temperatures in ...

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Abstract

The invention discloses a method for predicting battery life. The method comprises the following steps: testing the rated capacity Vn of the battery at different temperatures; after the battery is charged to an open-circuit voltage value corresponding to a certain specific SOC value, a constant voltage source is used for maintaining the voltage of the battery at the voltage value, then the charging current of the battery is gradually reduced to a constant value, and constant current values In corresponding to the specific SOC values at different temperatures are recorded; and determining the use coefficient eta of the battery at different temperatures in the actual application process, and calculating the evaluation index of the service life of the battery by taking the use coefficient eta, the constant current value In and the rated capacity Vn as evaluation factors so as to judge the service life of different batteries. According to the method, the misjudgment probability of the battery life caused by different side reaction degrees of the battery at different use temperatures can be remarkably reduced, so that the accuracy and the reliability of a battery life prediction result are greatly improved.

Description

technical field [0001] The invention belongs to the battery field, and in particular relates to a method for predicting battery life. Background technique [0002] At present, the cycle test method is usually used to evaluate the service life of the battery, that is, the cycle test is carried out under certain working conditions, but the test cycle of this method is long, even if the fast charging and discharging working condition is selected and the test is carried out in a high temperature environment, it still takes thousands of hours. It can only be completed, which not only takes up a lot of testing resources, but also seriously affects the product development progress. In order to obtain information about battery life in a short period of time, there is currently a method of charging the battery to an open-circuit voltage value corresponding to a certain SOC value at a specific temperature, and then using a constant voltage source to maintain the voltage of the battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/387
CPCG01R31/392G01R31/387
Inventor 吴华忠谢鹏刘璋勇
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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