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Method for evaluating health status of decommissioned lithium ion battery

A lithium-ion battery, state of health technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as low efficiency, achieve the effects of reducing evaluation costs, improving evaluation efficiency, and shortening evaluation time

Inactive Publication Date: 2019-04-12
河南利威新能源科技有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for evaluating the state of health of a decommissioned lithium-ion battery, which is used to solve the problem of low efficiency of the existing method for evaluating the state of health of the battery

Method used

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  • Method for evaluating health status of decommissioned lithium ion battery
  • Method for evaluating health status of decommissioned lithium ion battery
  • Method for evaluating health status of decommissioned lithium ion battery

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Embodiment Construction

[0014] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] This embodiment provides a method for evaluating the health status of retired lithium-ion batteries, which can accurately evaluate the health status of retired lithium-ion batteries, and is easy to popularize and apply. The corresponding flow chart is as follows figure 1 shown, including the following steps:

[0016] (1) Measure the high-frequency AC impedance R1 and low-frequency AC impedance R2 under the same state of charge of the battery, and obtain the difference between the high-frequency AC impedance R1 and the low-frequency AC impedance R2, which is expressed as: electrochemical impedance R = high-frequency AC impedance R1-low frequency AC impedance R2.

[0017] Among them, the battery to be measured is a decommissioned lit...

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Abstract

The invention relates to a method for evaluating health status of a decommissioned lithium-ion battery. The method comprises the following steps of: measuring the high-frequency AC impedance (R1) andthe low-frequency AC impedance (R2) under the same state of charge of the battery to obtain the difference between the high-frequency AC impedance (R1) and the low-frequency AC impedance (R2); and comparing the difference between the high-frequency AC impedance (R1) and the low-frequency AC impedance (R2) with the relationship between the difference between the high frequency AC impedance and thelow frequency AC impedance obtained from the calibration and the remaining life of the battery to determine the remaining life of the battery. According to the method for evaluating the health statusof the decommissioned lithium-ion battery, the complete AC impedance spectrum of the battery to be tested does not need to be collected, the time for evaluating the health status of the battery is significantly shortened, the evaluating efficiency is improved, and the evaluating cost is reduced.

Description

technical field [0001] The invention relates to a method for evaluating the health state of a decommissioned lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] Due to the advantages of high voltage, high energy density, low self-discharge rate and long service life, lithium-ion batteries are widely used in large-scale energy storage systems such as electric vehicles and energy storage power stations. With the passage of time, a large number of lithium-ion batteries are about to be decommissioned, and the secondary utilization technology needs to be developed urgently. Among them, the more important one is the evaluation technology of the State of Health (SOH) of lithium-ion batteries. Since the consistency of the batteries withdrawn from the vehicle or the energy storage power station is extremely discrete, the decommissioned batteries can be evaluated through fast and accurate evaluation methods. The remaining life...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392
Inventor 梁梦伟杨伟孙峥程代妹
Owner 河南利威新能源科技有限公司
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