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Standing method after electrolyte filling of lithium ion battery

A lithium-ion battery, standing technology, applied in the field of lithium-ion batteries, can solve disadvantages and other problems, achieve the effect of improving fluidity, reducing safety risks, and increasing surface tension

Active Publication Date: 2019-02-12
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high temperature environments are unfavorable for capillary-dominated infiltration of small-sized pores

Method used

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  • Standing method after electrolyte filling of lithium ion battery
  • Standing method after electrolyte filling of lithium ion battery
  • Standing method after electrolyte filling of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0037] According to the conventional manufacturing process, the positive and negative electrodes of lithium-ion batteries are made. The active material of the positive electrode is lithium cobaltate, and the active material of the negative electrode is graphite. Insert the core into the aluminum-plastic film case, inject commercial electrolyte, and seal the aluminum-plastic film case after liquid injection. The static method of lithium-ion battery after liquid injection comprises the following steps:

[0038] Step 1: Put the lithium-ion battery after liquid injection at high temperature, the temperature of the high temperature standing is not higher than 60°C and not lower than 40°C, and the high temperature standing time is not more than 16 hours and not less than 4 hours Hour;

[0039] Step 2: The lithium-ion battery after step 1 is left to stand at low temperature, the temperature of the low temperature is not higher than 25 ° C and not lower than the temperature of the eu...

Embodiment 1

[0042]According to the conventional manufacturing process, the positive and negative electrodes of lithium-ion batteries are produced. The active material of the positive electrode is lithium cobalt oxide, and the active material of the negative electrode is graphite. The battery cell is placed in the aluminum-plastic film case, and the commercial electrolyte is injected, and the aluminum-plastic film case is sealed after the liquid is injected. Standing method after injection: 40°C for 16 hours, 25°C for 4 hours. Then complete the following procedures. After the battery is fully charged, disassemble and check the status of the pole pieces. figure 1 It is a photograph of the negative electrode surface of the battery of this embodiment. The surface of the negative electrode is golden yellow, uniform in color and without abnormalities, indicating good infiltration.

Embodiment 2

[0044] The battery of this embodiment differs from Embodiment 1 only in the standing method after liquid injection, and the other processes are the same as Embodiment 1. The standing method of this embodiment: standing at 40° C. for 16 hours, and standing at 10° C. for 4 hours. After the battery is fully charged, disassemble and check the status of the pole pieces. figure 2 It is a photograph of the negative electrode surface of the battery of this embodiment. The surface of the negative electrode is golden yellow, uniform in color and without abnormalities, indicating good infiltration.

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Abstract

The invention provides a standing method after electrolyte filling of a lithium ion battery, aiming at improving the infiltration degree of electrolyte. The standing method comprises the following steps: step 1: carrying out high-temperature standing on the lithium ion battery filled with electrolyte at the temperature which is not higher than 60 DEG C and not lower than 40 DEG C for no more than16h and no less than 4h; step 2: carrying out low-temperature standing on the battery subjected to standing in step 1 at the temperature which is not higher than 25 DEG C and not lower than an eutectic point of an electrolyte solvent for no more than 16h and no less than 4h; step 3: finishing standing when the total sum of high-temperature standing time and low-temperature standing time is greaterthan or equal to 20h; otherwise, carrying out step 1; finishing standing when the sum of total high-temperature standing time and total low-temperature standing time is greater than or equal to 20h;otherwise, carrying out step 2; finishing standing when the total standing time is greater than or equal to 20h; otherwise, carrying out step 1 and entering the next cycle. The standing method belongsto the technical field of lithium ion batteries; the risk of accelerated attenuation of the cycle life of the batter is reduced through alternative high-temperature and low-temperature standing; thecirculating performance and low-temperature performance of lithium-sulfur batteries are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a static method for lithium-ion batteries after liquid injection. Background technique [0002] In recent years, with the rapid development of portable electronic devices, electric vehicles, and grid energy storage technologies, the demand for batteries and energy storage systems with high energy density, long life, and high safety has become increasingly urgent. Among the electrochemical energy storage devices that have been commercialized, lithium-ion batteries have become the best choice for people because of their advantages such as high energy density and long cycle life. [0003] At present, in the field of consumer electronics, the energy density of lithium-ion battery cells with a relatively mature system is usually lower than 800Wh / L; Provided energy density. Academia and industry are also increasing investment in research on ways to increase ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王昊鹏李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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