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A kind of standing method after liquid injection of lithium-ion battery

A lithium-ion battery, static technology, applied in the field of lithium-ion batteries, can solve disadvantages and other problems, achieve the effect of improving fluidity, increasing surface tension, and good wetting effect

Active Publication Date: 2021-05-11
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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  • A kind of standing method after liquid injection of lithium-ion battery
  • A kind of standing method after liquid injection of lithium-ion battery
  • A kind of standing method after liquid injection of lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0038] 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:

[0039] 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;

[0040] 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

[0043]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

[0045] 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

In order to improve the degree of infiltration of the electrolyte, the present invention describes a static method for lithium-ion batteries after liquid injection, which includes the following steps: Step 1: Put the lithium-ion batteries after liquid injection at a temperature not higher than 60°C and not lower than 40°C. Stand at high temperature for no more than 16 hours and no less than 4 hours at ℃; Step 2: Put the battery after standing in step 1 at a temperature not higher than 25°C and not lower than the eutectic point of the electrolyte solvent for no more than 16 hours, Not less than 4 hours; Step 3: When the sum of the high-temperature standing time and low-temperature standing time is ≥20h, stop standing, otherwise perform step 1, when the sum of the high-temperature standing time and the low-temperature standing time is ≥20h, stop standing Otherwise, go to step 2, the total time of standing is ≥ 20h, end the standing, otherwise continue to step 1, and proceed to the next cycle. The invention belongs to the technical field of lithium-ion batteries, and reduces the risk of accelerated attenuation of the battery cycle life by alternately standing at high and low temperatures, and improves the cycle performance and low-temperature performance of the lithium-sulfur battery.

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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Patent Type & Authority Patents(China)
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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