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High-flatness soft package lithium ion battery and preparation method thereof

A lithium-ion battery and flatness technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of reducing production costs, poor battery flatness, bending and wrinkles, etc. Improved flatness and easy operation

Pending Publication Date: 2020-08-25
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, and solve the problems that the surface of the existing soft-pack lithium-ion battery is prone to unevenness, bending and wrinkles, etc., resulting in very poor flatness of the battery and unqualified appearance, resulting in a large number of defective products. It is beneficial to reduce production costs and provide a high-flatness soft-pack lithium-ion battery

Method used

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  • High-flatness soft package lithium ion battery and preparation method thereof
  • High-flatness soft package lithium ion battery and preparation method thereof
  • High-flatness soft package lithium ion battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] A kind of high flatness soft package lithium ion battery, such as Figure 1-3 As shown, a bare cell 1 is included, and a separator 2 is firmly pasted on the upper surface and the lower surface of the bare cell 1 respectively, and placed in an aluminum-plastic film.

[0029] Wherein, firmly sticking means that the upper surface and the lower surface of the bare cell 1 are combined with the separator 2 without gaps, for example, adhesive tape can be used.

[0030] The separator 2 has uniformly distributed mesh gaps, and the surroundings of the separator 2 are chamfered.

[0031] The length of the separator 2 is 1.5 mm shorter than the length of the bare cell 1 , and the width of the separator 2 is 1.5 mm smaller than the width of the bare cell 1 .

[0032] The thickness of the partition 2 is 0.6 mm, and the radius of the chamfer around the partition 2 is 1.8 mm.

[0033] The separator 2 is made of plastic material ABS, which has certain strength, chemical stability and ...

Embodiment 2

[0035] The preparation method of the high-flatness soft-pack lithium-ion battery of the above-mentioned embodiment 1 comprises the following steps:

[0036] S1. Laminate the positive electrode sheet, separator, and negative electrode sheet in a zigzag shape and weld the tabs to obtain the bare cell 1;

[0037] S2. A separator 2 is firmly attached to the upper surface and the lower surface of the bare cell 1 described in S1;

[0038] S3. Place the bare cell with the separator 2 pasted in S2 in the aluminum-plastic film, seal the top and side, inject liquid, form, and separate the volume to obtain the high-flatness soft-pack lithium-ion battery.

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Abstract

The invention belongs to the technical field of soft package lithium ion batteries, and particularly relates to a high-flatness soft package lithium ion battery and a preparation method thereof. The preparation method comprises the steps that a positive plate, a diaphragm and a negative plate are subjected to Z-shaped lamination and tab welding, and a bare battery cell is obtained; the upper surface and the lower surface of the bare battery cell are respectively provided with a plastic partition plate, the length and the width of each plastic partition plate are 1 to 2 mm smaller than those ofthe bare battery cell, the thickness of each plastic partition plate is 0.5to 1 mm, the chamfer of each plastic partition plate is 1.5 to 2 mm, and the surfaces of the plastic partition plates are provided with net-shaped gaps and are uniformly distributed; and the bare battery cell with the plastic partition plates is put into an aluminum-plastic film, top side sealing, liquid injecting, formingand capacity grading are carried out to acquire the high-flatness soft package lithium ion battery. According to the invention, the flatness of the battery cell can be improved, and high flatness canbe permanently maintained; and the method has the advantages of simplicity and convenience in operation, low cost, easiness in large-scale production, improvement of the appearance yield of the battery cell, great reduction of the production cost and the like.

Description

technical field [0001] The invention belongs to the technical field of soft-pack lithium-ion batteries, and in particular relates to a high-flatness soft-pack lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density and long cycle life, and are widely used in energy storage, power systems and consumer electronics. As consumers continue to improve the performance requirements of lithium-ion batteries, improving the energy density of lithium-ion batteries has always been the most concerned issue in the industry and the scientific community. Among them, expanding the volume of lithium-ion batteries is one of the methods to increase energy density. However, as the volume of the polymer soft-packed lithium-ion battery increases, it is easy to have uneven surface, bending, and wrinkles during the charging and discharging process, resulting in very poor flatness and unqualified...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M10/0583
CPCH01M10/0525H01M10/058H01M10/0583Y02E60/10Y02P70/50
Inventor 查惟伟秦作路孙伟周建中李明钧佘伟华郭平
Owner TIANNENG SAFT ENERGY JOINT CO
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