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Method for screening lithium batteries with abnormal self discharge

A lithium battery, self-discharge technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of decreased test accuracy and low reliability, and achieve the effect of improving performance and prolonging battery life

Active Publication Date: 2015-01-07
NANJING GUOXUAN BATTERY CO LTD
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Problems solved by technology

This method, under the same conditions, shortens the standard time from 28 days to 1 to 6 days. Although there is no pressure on the environment and test costs, the test accuracy is greatly reduced. The shorter the time, the higher the reliability. Low

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  • Method for screening lithium batteries with abnormal self discharge

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specific Embodiment approach 1

[0023] Pick out the batteries with abnormal self-discharge rate from the 3.2V10Ah batteries that are ready to be assembled into 300V50Ah electric vehicles.

[0024] A method for screening lithium batteries with abnormal self-discharge, specifically comprising the following steps:

[0025] At first the lithium battery 3 to be tested is fully charged, and 100 lithium batteries 3 of every group are connected in parallel, and stand for 40 hours in the workshop; The self-discharge rate of abnormal self-discharge batteries is greater than 12%, and the self-discharge current of abnormal batteries is 1.79mA; select mA meter 1 (range 2mA, accuracy 0.001mA) to connect with wire 2 and measure the current between adjacent lithium batteries Current, calculate the net inflow current of each lithium battery; if the normal rate is 90%, the average self-discharge current is 0.74×0.9+1.79×0.1=0.85mA. The net inflow current of a normal battery with a monthly self-discharge rate of 5% is 0.74-0....

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Abstract

The invention discloses a method for screening lithium batteries with abnormal self discharge. The method comprising the following steps of: fully charging the lithium batteries and standing in parallel; measuring the current between adjacent lithium batteries with an ampere meter; and calculating net inflow current of each lithium battery, and judging whether abnormal self discharge exists according to the magnitude of the net inflow current of the battery. By adopting a simple and rapid method provided by the invention, the batteries with overlarge self charge can be screened before assembling, thereby avoiding adverse influence on the consistency of the whole set of batteries, improving the performance of a battery pack and prolonging the service life of the batteries.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for screening lithium batteries with abnormal self-discharge. Background technique [0002] When there is no external discharge circuit for storage batteries and primary batteries, the terminal voltage will decrease and the available power will be lost, which is called self-discharge. Due to the influence of raw materials and manufacturing processes, the self-discharge rate of a small amount of lithium-ion batteries will reach several times that of normal batteries. These batteries are used in series and parallel with other batteries, which will seriously affect the performance of the entire battery pack. It is necessary to select batteries with excessive self-discharge rate and treat them as substandard products. [0003] The detection of self-discharge rate, according to the national standard, needs more than 30 days, which brings great inconvenience to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 韩路贺狄龙马冬梅刘爱菊
Owner NANJING GUOXUAN BATTERY CO LTD
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