A kind of manufacturing method of high energy density pouch battery

A high-energy-density, soft-pack battery technology, applied in the field of high-energy-density soft-pack battery manufacturing, can solve the problems of low initial charge and discharge efficiency, affecting the capacity and energy density of lithium-ion batteries, to compensate for irreversible capacity loss, improve The effect of energy density

Active Publication Date: 2022-04-12
HUNAN GAOYUAN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method for manufacturing a high-energy-density pouch battery. By presetting the auxiliary electrode of aluminum foil and using the auxiliary electrode of aluminum foil to pre-charge with a small current, the pre-embedded lithium on the negative electrode of the lithium-ion battery is realized, and the lithium-ion battery is solved or improved. The first charge and discharge efficiency is low, which affects the capacity and energy density of lithium-ion batteries

Method used

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  • A kind of manufacturing method of high energy density pouch battery

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Embodiment 1

[0029] Such as figure 1 As shown, an in-situ pre-lithiation structure of a high-energy-density soft-pack battery includes a soft-pack battery composed of an aluminum-plastic film 4 and a lithium battery core 3, and the bottom of the lithium battery core 3 is wrapped with an aluminum foil auxiliary electrode 9. The battery core 3 and the aluminum foil auxiliary electrode 9 are separated by a separator.

[0030] The lithium battery roll core 3 includes a positive electrode sheet, a negative electrode sheet and a separator (not shown in the figure), the positive electrode ear 1 of the positive electrode sheet and the negative electrode ear 2 of the negative electrode sheet are located on the top of the pouch battery, and the end of the aluminum foil auxiliary electrode 9 is welded with aluminum plastic The composite tab 8 and the aluminum-plastic composite tab 8 are drawn from the bottom corner of the air bag 7 of the pouch battery.

[0031] One side of the air bag 7 is provided...

Embodiment 2

[0033] A method for manufacturing a high energy density pouch battery, the process is as follows:

[0034] Using lithium cobalt oxide as the positive electrode active material, the positive electrode sheet is prepared according to the traditional process; the nano-silicon / carbon composite material is used as the negative electrode active material, and the negative electrode sheet is prepared according to the traditional process; the positive electrode sheet, the negative electrode sheet, and the diaphragm are wound to obtain the winding core , where the positive tab and the negative tab are located on the top of the core, and a layer of aluminum foil is wrapped at the bottom of the core as an auxiliary electrode. Both surfaces of the auxiliary electrode of the aluminum foil are covered with a separator to insulate the core of the battery. In the aluminum-plastic film, the aluminum-plastic composite tab is connected to the auxiliary electrode of the aluminum foil and drawn out f...

Embodiment 3

[0041] A method for manufacturing a high energy density pouch battery, the process is as follows:

[0042] Using lithium cobalt oxide as the positive electrode active material, the positive electrode sheet is prepared according to the traditional process; the silicon oxide / carbon composite material is used as the negative electrode active material, and the negative electrode sheet is prepared according to the traditional process; the positive electrode sheet, the negative electrode sheet, and the diaphragm are wound to obtain the core , where the positive tab and the negative tab are located on the top of the core, and a layer of aluminum foil is wrapped at the bottom of the core as an auxiliary electrode. Both surfaces of the auxiliary electrode of the aluminum foil are covered with a separator to insulate the core of the battery. In the aluminum-plastic film, the aluminum-plastic composite tab is connected to the auxiliary electrode of the aluminum foil and drawn out from the...

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Abstract

The invention provides a method for manufacturing a high-energy-density pouch battery, which includes the following steps: Step 1: Wrap the bottom of the lithium battery core with an auxiliary electrode of aluminum foil, and use a separator to isolate and insulate the battery core and the auxiliary electrode of the aluminum foil , to obtain a pouch battery after assembly; step 2: inject electrolyte 1 into the pouch battery obtained in step 1, and use the aluminum foil auxiliary electrode for pre-charging after sealing; step 3: take out the aluminum foil auxiliary electrode after pre-charging, and remove free Electrolyte 1 is injected into electrolyte 2, and after post-treatment, a high-energy-density pouch battery is obtained. In the present invention, an aluminum foil auxiliary electrode is preset at the bottom of the lithium ion battery core, and through the synergistic effect of the aluminum foil auxiliary electrode and the electrolyte solution 1 containing additives, the pre-embedded lithium on the negative electrode of the lithium ion battery is realized during the small current precharging process, solving the problem of Or improve the problem of low charging and discharging efficiency of lithium-ion batteries for the first time, thereby increasing the capacity and energy density of lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of high energy density pouch batteries, in particular to a manufacturing method of high energy density pouch batteries. Background technique [0002] As a green battery, lithium-ion battery has the advantages of high working voltage, high specific energy and long cycle life. It has been developed rapidly in recent years. The application in is more and more extensive. [0003] With the development of mobile devices towards miniaturization and multi-function, higher requirements are placed on the energy density and service life of lithium-ion batteries. Also due to the rapid development and wide application of various portable electronic devices and electric vehicles, there is an urgent need for lithium-ion batteries with high energy and long cycle life. [0004] At present, graphite, the main negative electrode material of commercial lithium-ion batteries, has limited the further improvement of lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0587H01M10/42H01M10/0525
CPCH01M10/058H01M10/0587H01M10/4235H01M10/0525Y02P70/50Y02E60/10
Inventor 唐杰雄李阳春李吉蓉郭正湘陈三朝雷文杰
Owner HUNAN GAOYUAN BATTERY
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