Method used for rapid sorting of lithium ion batteries

A sorting technology for lithium-ion batteries, applied in secondary battery charging/discharging, secondary battery repair/maintenance, sorting, etc., can solve problems such as single sorting parameters, insufficient data accuracy, and increased sorting costs , to achieve the effect of simple operation, overall performance guarantee and cost saving

Active Publication Date: 2014-01-29
NINGBO SHIJIE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, although these two sorting methods are simple and convenient to operate, the sorting parameters used are still relatively single, which cannot fully reflect the performance of the battery. The performance consistency of the sorted battery is not high, and the data accuracy is not enough.
[0006] In addition, the patent public

Method used

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  • Method used for rapid sorting of lithium ion batteries
  • Method used for rapid sorting of lithium ion batteries
  • Method used for rapid sorting of lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for rapidly sorting lithium-ion batteries, comprising the following steps:

[0029] ①. Select 100 lithium-ion batteries with a rated capacity of 60Ah, use the chemical composition capacity detection cabinet to perform three charge-discharge cycles at a charge-discharge rate of 0.5C at room temperature, and finally set the SOC of the battery to 50%.

[0030] ②. Collect the discharge capacity, total charge capacity, constant current charge capacity, and constant current ratio (constant current ratio = constant current charge capacity / total charge capacity, counted by percentage) of each single lithium-ion battery during the third charge and discharge. .

[0031] ③. After the test, unload the lithium-ion battery from the capacity separation test cabinet, and place it at room temperature for 24 hours to ensure the stability of the battery.

[0032] ④. After standing still, use a voltage internal resistance tester to test the open circuit voltage and internal resis...

Embodiment 2

[0044] A method for rapidly sorting lithium-ion batteries, comprising the following steps:

[0045] ①. Select 100 power lithium-ion batteries with a rated capacity of 92Ah, use the chemical composition capacity detection cabinet to perform three charge-discharge cycles at a charge-discharge rate of 0.3C at room temperature, and finally set the SOC of the battery to 50% .

[0046]②. Collect the discharge capacity, total charge capacity, constant current charge capacity, and constant current ratio (constant current ratio = constant current charge capacity / total charge capacity, counted by percentage) of each single lithium-ion battery when it is charged and discharged for the third time .

[0047] ③. After the test, unload the lithium-ion battery from the composition and capacity testing cabinet, and place it at room temperature for 48 hours to ensure the stability of the battery.

[0048] ④. After standing still, use a voltage internal resistance tester to test the open circu...

Embodiment 3

[0060] ①. Select 100 power lithium-ion batteries with a rated capacity of 200Ah, use the chemical composition and capacity detection cabinet to perform charge and discharge cycles at a charge and discharge rate of 0.2C for 3 times at room temperature, and finally set the SOC of the battery to 50%.

[0061] ②. Collect the discharge capacity, total charge capacity, constant current charge capacity, and constant current ratio (constant current ratio = constant current charge capacity / total charge capacity, counted by percentage) of each single lithium-ion battery when it is charged and discharged for the third time .

[0062] ③. After the test, unload the lithium-ion battery from the composition and capacity testing cabinet, and place it at room temperature for 36 hours to ensure the stability of the battery.

[0063] ④. After standing still, use a voltage internal resistance tester to test the open circuit voltage and internal resistance of each single lithium-ion battery, and r...

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Abstract

The invention discloses a method used for rapid sorting of lithium ion batteries. The method comprises following steps: (1) three times of charge-discharge cycles are performed under a charge and discharge rate of 0.05 to 1.5C; (2) discharge capacity, total charge capacity, constant current charge capacity and constant current ratio of the third charge-discharge cycle are recorded; (3) the lithium ion batteries are allowed to stand for 12 to 72h; (4) open-circuit voltage and internal resistance are determined; (5) lithium ion batteries with a discharge capacity less than 1.05 times of rated capacity, and a constant current ratio less than 95% are eliminated, arithmetic mean values of the parameters of the rest lithium ion batteries are calculated, and the rest lithium ion batteries are selected based on following standards, A discharge capacity deviation ranges from +-0.5% to +-3%, B constant current ratio deviation ranges from +-0.2% to +-1%, C internal resistance deviation ranges from +-1% to +-10%, and D open-circuit voltage deviation ranges from +-0.03% to +-0.1%. Operation of the method is simple and convenient, cost is reduced, no extra equipment is needed, and sorting effect is obviously better than that of traditional sorting method.

Description

technical field [0001] The invention relates to a method for sorting lithium ion batteries. Background technique [0002] Lithium-ion batteries have become the preferred power source for electric vehicles and energy storage due to their advantages such as high operating voltage, high energy density, small self-discharge, no memory effect, and high charge-discharge efficiency. In practical applications, single lithium-ion batteries are modularized and grouped through appropriate series and parallel connections, thereby increasing the voltage and capacity of the overall battery pack to meet the power requirements of various fields. In the process of grouping, if the performance of the single cells varies greatly, it will affect the overall performance of the battery pack, greatly reducing the service life of the battery pack, and in severe cases, it will lead to overcharge and overdischarge of the battery, resulting in safety hazards (such as explosions) Wait). Therefore, be...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/44
CPCB07C5/344
Inventor 张宏立娄永文赵福地李海啸张永学
Owner NINGBO SHIJIE NEW ENERGY TECH
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