Process for detecting self-discharge of lithium batteries

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

Active Publication Date: 2014-11-12
上海电气国轩新能源科技(南通)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Process for detecting self-discharge of lithium batteries
  • Process for detecting self-discharge of lithium batteries
  • Process for detecting self-discharge of lithium batteries

Examples

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Embodiment 1

[0022] Pick out the batteries with abnormal self-discharge rate from the 3.2V10Ah batteries that are ready to be assembled as 48V10Ah electric bicycle battery packs.

[0023] A screening method for lithium battery self-discharge, specifically comprising the following steps:

[0024] First the standard lithium battery 3 of the same model and the lithium battery 4 to be tested are fully charged, connected in parallel, and left standing in the workshop for 40 hours; the monthly self-discharge rate of the known selected standard lithium battery 3 is 3%, and the self-discharge current It is 0.45mA; select milliampere meter 1 (range 2mA, accuracy 0.001mA) to connect with wire 2 and measure the current flowing from the standard lithium battery to the lithium battery to be tested, and calculate the inflow current of each lithium battery to be tested.

[0025] The lithium battery to be tested with an inflow current of 0.3mA is calculated to have a monthly self-discharge rate of 5%, whi...

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Abstract

The invention discloses a process for detecting self-discharge of lithium batteries. The process particularly comprises the following steps that lithium batteries to be detected and a standard lithium battery with known self-discharge rate are fully charged and parallelly connected for standing; and flow-in current flowing from the standard lithium battery to each lithium battery to be detected is respectively recorded through an ampere meter, and the lithium batteries with large self-discharging are selected out through the flow-in current. By means of the simple and quick method, the lithium batteries with large self-discharging can be selected out before being assembled into a pack, influence on consistency of the whole pack of the batteries caused by the lithium batteries with large self-discharging can be avoided, performance of a battery pack is improved, and service life of the batteries is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a screening method for self-discharge of lithium batteries. 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 the operati...

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 上海电气国轩新能源科技(南通)有限公司
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