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Electrolyte infiltration method of lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the direction of secondary battery charging/discharging, secondary battery, electrolyte battery manufacturing, etc., can solve the problem that the infiltration effect is difficult to further improve, so as to avoid the occurrence of lithium precipitation, improve the effect, molecular The effect of enhanced diffusivity

Active Publication Date: 2022-01-11
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]Therefore, the technical problem to be solved in the present invention is to overcome that the traditional lithium-ion battery pole piece infiltration method in the prior art is not suitable for relatively thick and large square Batteries, the defect that the infiltration effect is difficult to further improve, thus providing an electrolyte infiltration method for lithium-ion batteries

Method used

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  • Electrolyte infiltration method of lithium ion battery
  • Electrolyte infiltration method of lithium ion battery
  • Electrolyte infiltration method of lithium ion battery

Examples

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Effect test

Embodiment 1

[0055] This embodiment provides an electrolyte infiltration method for a lithium-ion battery, and the specific operation includes the following steps:

[0056] High-pressure liquid injection, using 10 cycles to inject the electrolyte into the 2MEB (44.3*220*122) square battery, the battery capacity is 180Ah, the battery is mainly composed of battery structural parts, diaphragm, electrolyte, positive electrode and negative electrode . Among them, the structural parts are welded by the aluminum cover plate and the aluminum shell to form the external structure. The inside of the shell is mainly the positive plate, the negative plate and the diaphragm through Z-shaped laminations, which are stacked layer by layer. The electrolyte is injected through the reserved liquid of the cover plate. Pores are injected into the inside of the case to infiltrate the positive and negative plates and separators. The electrolyte solution is DMC:EC:DEC:EMC=1:1:1:1, where the liquid injection volum...

Embodiment 2

[0086] This embodiment provides an electrolyte infiltration method for a lithium-ion battery, and the specific operation includes the following steps:

[0087] High-pressure liquid injection, using 10 cycles to inject the electrolyte into the 2MEB (44.3*220*122) square battery, the battery capacity is 180Ah, the battery is mainly composed of battery structural parts, diaphragm, electrolyte, positive electrode and negative electrode . Among them, the structural parts are welded by the aluminum cover plate and the aluminum shell to form the external structure. The inside of the shell is mainly the positive plate, the negative plate and the diaphragm through Z-shaped laminations, which are stacked layer by layer. The electrolyte is injected through the reserved liquid of the cover plate. Pores are injected into the inside of the case to infiltrate the positive and negative plates and separators. The electrolyte solution is DMC:EC:DEC:EMC=1:1:1:1, where the liquid injection volum...

Embodiment 3

[0117] This embodiment provides an electrolyte infiltration method for a lithium-ion battery, and the specific operation includes the following steps:

[0118] High-pressure liquid injection, using 10 cycles to inject the electrolyte into the 2MEB (44.3*220*122) square battery, the battery capacity is 180Ah, the battery is mainly composed of battery structural parts, diaphragm, electrolyte, positive electrode and negative electrode . Among them, the structural parts are welded by the aluminum cover plate and the aluminum shell to form the external structure. The inside of the shell is mainly the positive plate, the negative plate and the diaphragm through Z-shaped laminations, which are stacked layer by layer. The electrolyte is injected through the reserved liquid of the cover plate. Pores are injected into the inside of the case to infiltrate the positive and negative plates and separators. The electrolyte solution is DMC:EC:DEC:EMC=1:1:1:1, where the liquid injection volum...

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Abstract

The invention belongs to the technical field of lithium ion battery preparation, and particularly relates to an electrolyte infiltration method of a lithium ion battery. The electrolyte infiltration method of the lithium ion battery pole piece provided by the invention comprises the following steps of high-pressure liquid injection, primary shelving, primary pre-charging, secondary shelving, secondary pre-charging, tertiary shelving and liquid supplementation, and the step of secondary pre-charging is limited. The method is suitable for all lithium ion batteries, especially for square lithium batteries, and overcomes the problem that the infiltration effect of thick and large square batteries is difficult to improve. By adopting the method provided by the invention, the infiltration effect of the battery can be obviously improved, the electrolyte absorption amount is obviously increased, and the internal resistance of the battery is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion batteries, and in particular relates to an electrolyte infiltration method for lithium-ion batteries. Background technique [0002] At present, the lithium-ion battery market is getting bigger and bigger. Customers have higher and higher requirements for battery energy density and larger battery size. In order to improve the fast charging capacity, the internal coating thickness of the battery is continuously reduced, resulting in the The space for the active material and electrolyte to infiltrate is getting smaller and smaller; in order to increase the energy density, the free space inside the battery is continuously reduced, so that the electrolyte has no place to store. With the increasing requirements for battery stability, the application of nickel single crystal and high-nickel single crystal materials in the positive electrode is also increasing, and the problem that the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M10/44
CPCH01M10/058H01M10/0525H01M10/446Y02E60/10Y02P70/50
Inventor 王稳李文成苏家磊李硕阴济光张俊川张旺
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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