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Retired power battery performance evaluation method and system

A power battery and battery technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as reducing the economical efficiency of power battery cascade utilization, destroying the performance of retired power batteries, etc. Performance evaluation time, evaluation cost savings, easy-to-achieve results

Pending Publication Date: 2020-09-15
HANGZHOU E ENERGY ELECTRIC POWER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current capacity assessment for decommissioned power is mainly to charge and discharge the battery 1-3 times at a certain rate (usually 0.3-0.5C) at room temperature to obtain the remaining capacity of the decommissioned power battery; although this method can be compared Accurately grasp the current capacity of the battery, but due to the long test time, it usually takes several hours to more than ten hours, and it is generally carried out in the laboratory. The cost of engineering application is high, which greatly reduces the cascade utilization of power batteries. economy
The internal resistance evaluation of decommissioned power batteries usually uses an internal resistance tester to test the AC impedance value at a certain frequency point (usually 1000Hz). Although this method can obtain the internal resistance value of the battery in a short period of time, the What is obtained is the static internal resistance of the decommissioned power battery, and the dynamic internal resistance of the battery during charging and discharging cannot be grasped, and the dynamic internal resistance is more instructive for the use of decommissioned power batteries
For the evaluation of the safety status of decommissioned power batteries, one is to test the state of the battery under various abuse conditions such as overcharge, overdischarge, short circuit, furnace temperature, etc., to check whether the battery meets the corresponding technical standards, and the other is to use the accelerated calorimeter test Thermal runaway characteristics of decommissioned power batteries, analyzing the self-heating trigger temperature and thermal runaway starting temperature of the battery, so as to guide the determination of the temperature control threshold of decommissioned power batteries in the cascade utilization process; but these two types of safety assessment methods are based on damage At the expense of decommissioned power battery performance, batteries that have undergone safety assessment have no value for cascade utilization

Method used

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Examples

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Embodiment 1

[0046] This embodiment provides a method for evaluating the performance of decommissioned power batteries, such as figure 1 As shown, the steps are as follows:

[0047] (1) Capacity evaluation of decommissioned power batteries: Estimate the remaining capacity of decommissioned power batteries according to the voltage change of the decommissioned power batteries during the charging and discharging process of 5-10 minutes.

[0048] ①Measure the open circuit voltage V of the battery ocv , and judge whether the battery is charging or discharging according to the open circuit voltage value. For lithium iron phosphate / graphite system batteries, when the open circuit voltage is less than 3.23V, charge it; when the open circuit voltage is greater than 3.28V, discharge it; when the open circuit voltage is between 3.23-3.28V, charge it It can be charged or discharged.

[0049] ②Charge (or discharge) the battery at a rate of 1 / 3C of the rated capacity of this type of battery for 5-10 ...

Embodiment 2

[0070] This embodiment provides a decommissioned power battery performance evaluation system, such as figure 2 As shown, it is composed of the capacity evaluation unit of the retired power battery, the internal resistance evaluation unit of the retired power battery and the safety evaluation unit of the retired power battery.

[0071] 1. The capacity evaluation unit of the decommissioned power battery: Estimate the remaining capacity of the decommissioned power battery according to the voltage change of the decommissioned power battery during the charging and discharging process of 5-10 minutes. The specific evaluation process of capacity is as follows:

[0072] ①Measure the open circuit voltage V of the battery ocv , and judge whether the battery is charging or discharging according to the open circuit voltage value. For lithium iron phosphate / graphite system batteries, when the open circuit voltage is less than 3.23V, charge it; when the open circuit voltage is greater th...

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Abstract

The invention discloses a retired power battery performance evaluation method and system. The evaluation method comprises the following steps: 1) evaluating the capacity of a retired power battery: estimating the residual capacity of the retired power battery according to the voltage change of the retired power battery in the charging and discharging process of 5-10 minutes; 2) evaluating the internal resistance of the retired power battery: evaluating the alternating current internal resistance and the direct current internal resistance of the retired power battery, and judging whether the retired power battery can be utilized in an echelon manner according to evaluation results; and 3) evaluating the safety of the retired power battery: evaluating the safety of the retired power batteryaccording to the appearance, the size, the open-circuit voltage and the historical operation data of the retired power battery. According to the method, the capacity, internal resistance, safety and other properties of the retired power battery can be mastered within 20 minutes, the time in evaluating the properties of the retired power battery is shortened, and the process cost of echelon utilization of the retired power battery is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles and energy storage, and in particular relates to a performance evaluation method of a decommissioned power battery for judging whether the decommissioned power battery can be used in cascades. Background technique [0002] Since 2013, my country's electric vehicle industry has entered a period of rapid development. In 2018 and 2019, the sales of electric vehicles exceeded 1 million. By the end of 2019, the cumulative number of electric vehicles in my country exceeded 3.4 million. Current electric vehicles mainly use lithium-ion batteries as the power source. During the use of electric vehicles, the performance of power batteries continues to decline. When their performance cannot meet the application requirements of new energy vehicles, they must be retired from the vehicle. Among these decommissioned power batteries, a large part still has high residual energy. After re-evaluation and s...

Claims

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Application Information

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IPC IPC(8): G01R31/3842G01R31/388G01R31/389
CPCG01R31/3842G01R31/388G01R31/389
Inventor 赵洲峰裘吕超梅简张杰罗宏建周宇通陈胤桢鲁旷达徐冬梅惠洋谷小博邹君文张江丰李小英赵洪宇徐强
Owner HANGZHOU E ENERGY ELECTRIC POWER TECH
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