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A wetting method for high-capacity high-pressure negative electrode lithium ion battery

A lithium-ion battery, high-pressure compaction technology, applied in the direction of secondary batteries, battery pack components, non-aqueous electrolyte storage batteries, etc., can solve the problems of high fluid loss of batteries, difficult infiltration at room temperature, and unsatisfactory cycle life. Achieve the effects of enhanced cycle life, improved ability to adsorb electrolyte, and reduced soaking time and waiting time

Inactive Publication Date: 2018-12-21
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the current room temperature infiltration of lithium ion batteries is generally difficult, the battery cell loses a lot of fluid, and the cycle life is not ideal, the present invention provides an infiltration method for high-capacity and high-pressure negative electrode lithium-ion batteries

Method used

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Effect test

Embodiment 1

[0028] The low porosity and high compaction negative electrode material that the infiltration method of the present invention obtains sees figure 1 , a method for impregnating a high-capacity and high-pressure negative electrode lithium-ion battery, the specific steps are as follows:

[0029] 1) Liquid injection by vacuuming: place the prepared cylindrical battery on a liquid injection stand with graduated metering, and put in 105% of the required amount of electrolyte. Put the liquid injection rack in the vacuum box for vacuuming. The vacuum degree of the vacuum box is controlled at -0.09MPa. The vacuum holding time is 2 minutes, and then the pressure is released. The end of the pressure relief pipe is connected to an exhaust gas treatment device. Let the electrolyte slowly permeate inside the cell, and then cycle three times;

[0030] 2) Shelving at high temperature: Shelve the unsealed battery cell after vacuuming and injecting liquid at a temperature of 35°C, with the liq...

Embodiment 2

[0037] A kind of soaking method of high-capacity and high-pressure negative electrode lithium-ion battery, concrete steps are as follows:

[0038] 1) Liquid injection by vacuuming: place the prepared cylindrical battery on a liquid injection stand with graduated metering, and put in 105% of the required amount of electrolyte. Put the liquid injection rack in the vacuum box for vacuuming. The vacuum degree of the vacuum box is controlled at -0.09MPa. The vacuum holding time is 2 minutes, and then the pressure is released. The end of the pressure relief pipe is connected to an exhaust gas treatment device. Let the electrolyte slowly permeate inside the cell, and then cycle three times;

[0039] 2) Shelving at high temperature: Shelve the unsealed battery cell after vacuuming and injecting liquid at a temperature of 40°C, with the liquid injection port facing up, for 10 hours, and at the same time, fill the oven with nitrogen for protection;

[0040] 3) Pre-formation: On the cha...

Embodiment 3

[0046] The low-porosity high-compact negative electrode material used in the infiltration method of the present invention is shown in figure 1 ,Specific steps are as follows:

[0047] 1) Liquid injection by vacuuming: place the prepared cylindrical battery on a liquid injection stand with graduated metering, and put in 105% of the required amount of electrolyte. Put the liquid injection stand in the vacuum box for vacuuming, the vacuum degree of the vacuum box is controlled at -0.095MPa, the vacuum holding time is 2 minutes, and then the pressure is released. The end of the pressure relief pipe is connected to an exhaust gas treatment device. After the pressure relief, the shelf time is 10 minutes. Let the electrolyte slowly permeate inside the cell, and then cycle three times;

[0048] 2) Shelving at high temperature: Shelve the unsealed battery cells after vacuuming and injecting liquid at a temperature of 35°C, with the liquid injection port upward, for 8 hours, and at the...

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Abstract

The invention relates to the field of preparation of lithium ion batteries, in particular to a wetting method of a high-capacity high-pressure negative electrode lithium ion battery. On the basis of high temperature wetting, Vacuum injection, high temperature shelving, pre-forming, high temperature shelving, secondary injection sealing and continuous forming are adopted in six phases to fully soakthe high-capacity high-pressure negative electrode. Firstly, the advantages of high-efficiency high-temperature soaking are retained, and two high-temperature shelves are used before and after the high-temperature soaking, which reduces the soaking time and waiting time and saves the time cost. 2, that pre-forming and the continuous for processes are added to enhance the adsorption capacity of the high-capacity high-pressure solid negative electrode to the electrolyte, and the phenomenon of lithium precipitation in the charge-discharge process is avoided; The cycle life of high-capacity high-pressure lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to the field of lithium-ion battery preparation, in particular to an infiltration method for a high-capacity, high-pressure compacted negative electrode lithium-ion battery. Background technique [0002] Energy shortage and environmental pollution are two major problems facing modern society. In order to alleviate the pressure on energy and environment, the electric vehicle industry has emerged as the times require. The rapid development of electric vehicles and the gradual replacement of fuel vehicles has become an inevitable trend of the times. Lithium-ion batteries have the advantages of good cycle performance, high energy density, wide operating temperature range, no memory effect, green and pollution-free, etc. [0003] As people continue to pursue the energy density of lithium-ion batteries, the compaction density of battery pole pieces is also increasing. The increase of compaction density increases the difficulty of wetti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/36H01M10/44H01M10/058H01M10/0525H01M50/609
CPCH01M10/0525H01M10/058H01M10/446H01M50/60Y02E60/10Y02P70/50
Inventor 李芳芳张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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