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A kind of lithium-ion battery assembly method

A lithium-ion battery and battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of poor battery consistency and affecting the service life of battery packs, and achieve good consistency and long service life The effect of improving the accuracy of length, voltage and K value

Active Publication Date: 2020-07-31
FENGFAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the common self-discharge phenomenon of batteries, the voltage will continue to drop over time. The increase of the voltage difference keeps increasing, and the consistency of the battery becomes poor, which greatly affects the service life of the battery pack

Method used

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  • A kind of lithium-ion battery assembly method

Examples

Experimental program
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Effect test

Embodiment Construction

[0025] The matching method of the present invention is further described below in conjunction with the examples:

[0026] Capacity classification: Take a battery with a battery model of 805085-3600mAh as an example, and divide it into a container to test the capacity according to the following process:

[0027] 1. 1800mA constant current discharge, lower limit voltage 3.0V;

[0028] 2. Leave it on hold for 10 minutes;

[0029] 3. 1800mA constant current and constant voltage charging, upper limit voltage 4.2V, cut-off current 36mA;

[0030] 4. Leave it on hold for 10 minutes;

[0031] 5. 1800mA constant current discharge, lower limit voltage 3.0V;

[0032] 6. Leave it on hold for 10 minutes;

[0033] 7. 1800mA constant current and constant voltage charging, upper limit voltage 3.9V, cut-off current 36mA;

[0034] 8. Stop.

[0035] After the capacity test process is over, classify the lithium batteries according to the discharge capacity of the above process 5, and classif...

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Abstract

The invention discloses a lithium ion battery matching method. The method comprises capacity grading, battery aging and voltage internal resistance test: aging a battery in twice and testing voltage internal resistance of the battery after each aging, initial grouping: carrying out initial grouping on batteries based on a certain standard according to a voltage drop speed K value, second test voltage V2 and second test internal resistance R2 of the batteries, and final grouping: sorting the batteries subjected to initial grouping in the same group according to a preset rule, orderly selectingthe sorted batteries and carrying out final grouping. Through aging in twice and grouping in twice, the K value is used in grouping. After the final grouping, the performance indexes of the batteriesin the group are nearly the same, and the increasing of the battery voltage difference is further reduced along with time so that the battery consistency after grouping is improved and the service life of the battery pack is prolonged.

Description

technical field [0001] The invention relates to a lithium-ion battery assembly method, which belongs to the technical field of lithium-ion batteries. Background technique [0002] With the development of the economy and the progress of society, the battery industry has developed rapidly. Lithium-ion batteries are widely used in mobile devices due to their high specific energy, no memory effect, and long cycle life. As the types of mobile devices increase, the requirements for the voltage range and capacity of the power supply are getting higher and higher. Lithium-ion batteries need to be connected in series to increase the voltage and in parallel to increase the capacity to meet the needs of mobile devices. In the process of series-parallel connection of lithium-ion batteries, the consistency of each single battery is very important. If the consistency of a certain battery is not good, the performance of each single battery in the battery pack will not be fully utilized, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42
CPCH01M10/4207Y02E60/10
Inventor 郑军永雷曙光王志江黎宁侯如娟田旺
Owner FENGFAN
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