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Lithium battery self-discharge detection method and device

A detection method and technology of detection device, applied in the direction of measurement device, measurement of electricity, measurement of electric variables, etc., can solve the problems of endangering the life and property safety of users, user influence, over-discharge, etc., so as to improve the accuracy of determination and ensure on schedule. Delivery, the effect of low false positive rate

Inactive Publication Date: 2021-09-28
JIANGLING MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large self-discharge is not allowed and will have a great impact on users. In severe cases, it will lead to safety problems such as over-discharge and short-circuit, endangering the lives and property of users.

Method used

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  • Lithium battery self-discharge detection method and device
  • Lithium battery self-discharge detection method and device
  • Lithium battery self-discharge detection method and device

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0021] see figure 1 , image 3 , a lithium battery self-discharge detection method of the present invention, quickly judge whether the battery self-discharge rate is qualified through the following steps, the process comprising:

[0022] First, randomly select N new storage batteries for long-term storage (the larger the N, the better, it is recommended to be greater than 200), regularly record their OCV values, and screen out M qualified batteries (M≤N) according to the OCV value at the end of storage, and derive this The corresponding table of M qualified battery OCV values ​​and storage time, and then calculate the corresponding K value under different storage time, make a normal distribution map of K value, get the sample mean and standard deviation, set the confidence interval, and get the standard K 0 value; see the procedure for figure 1 ;

[0023] Secondly, the process for judging whether the self-discharge rate of the battery is qualified is as follows:

[0024] 1...

Embodiment 2

[0029] see figure 2 , The lithium battery self-discharge detection device of the present invention includes 4 modules: a detection module, a storage module, a processing module, and an alarm module, wherein: the detection module is used to detect the battery OCV value; the storage module is used to store battery codes, OCV data, Test time, etc.; the processing module, according to the corresponding table of qualified battery OCV value and storage time, calculates the standard value of self-discharge rate K 0 The corresponding table with the storage time is used as the basis for judgment; the alarm module, according to the feedback results of the processing module, gives different alarms respectively, the green light is on for good products, the product is normally unloaded, and enters the next process; the red light is on for defective products, and the product enters Defective product area, to be further processed.

[0030] The lithium battery self-discharge detection metho...

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Abstract

The invention discloses a lithium battery self-discharge detection method and device. The lithium battery self-discharge detection method, comprises the following steps of: selecting N new lower-bin batteries for long-term storage, regularly recording OCV values of the batteries, screening M qualified batteries according to the OCV values of the last storage period, exporting a corresponding table of the OCV values of the M qualified batteries and storage time, calculating corresponding K values under different storage time, making a normal distribution diagram of the K values, obtaining a sample mean value and a standard deviation, setting a confidence interval to obtain a standard K0 value; standing the battery after formation and capacity grading for a period of time, placing the battery into a feeding system of a self-discharge detection device to test a first OCV value after the voltage OCV of the battery is stable, and storing data; after the battery is stored for a period of time, testing a second OCV value, and storing data; calculating the self-discharge rate K value of the battery according to the OCV difference value of the first battery and the second battery and the middle interval time, then obtaining the standard value K0 of the self-discharge rate at the corresponding time interval in a table look-up mode, comparing the two values, and judging the product to be a defective product if K is larger than K0; judging the product to be a good product if K is not larger than K0.

Description

technical field [0001] The invention relates to a battery detection technology, in particular to a battery discharge detection method and device for judging whether the self-discharge rate of the battery is qualified. Background technique [0002] Lithium-ion battery is an electrochemical energy storage device. Due to its high energy density, environmental friendliness, and moderate cost, it is widely used in new energy vehicles and consumer electronics products. It mainly includes 4 parts: positive electrode and negative electrode , diaphragm, electrolyte. Due to the existence of trace impurities in the positive and negative electrode materials, the existence of micro-short circuits in the separator, and the manufacturing defects brought in during the production process, etc., there will be a certain self-discharge in the battery. Small self-discharge exists objectively and will not affect users. Large self-discharge is not allowed, and it will have a great impact on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/387
CPCG01R31/387
Inventor 操海波董冰汤桃峰张建辉张坤华涂洪庆
Owner JIANGLING MOTORS