A kind of silica gel pad and its application in the preparation of lithium ion battery

A lithium-ion battery, silicone pad technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of uneven pressure, lithium precipitation, and indentation on the surface of the battery cell, and increase the deformation capacity. , to ensure fit, reduce the effect of the transmission path

Active Publication Date: 2021-05-18
余姚市海泰贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method will cause new problems. At the junction of the main body of the battery core and the high-temperature-resistant polyester film, due to the difference in thickness, it will cause uneven pressure here, and indentations will be generated on the surface of the battery core. After several times, there is a risk of lithium precipitation and black spots
[0005] The public document with application number 201710935670.6 discloses a lithium-ion battery formation method and lithium-ion battery, and its improvement of the formation process does not solve the above problems

Method used

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  • A kind of silica gel pad and its application in the preparation of lithium ion battery
  • A kind of silica gel pad and its application in the preparation of lithium ion battery
  • A kind of silica gel pad and its application in the preparation of lithium ion battery

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preparation example Construction

[0058] A1. Preparation of bare cell: Generally, a positive electrode sheet, a negative electrode sheet, and a diaphragm can be used to make a bare cell through lamination or winding processes, and the diaphragm is a rubber-coated diaphragm. The adhesive layer of the glue-coated diaphragm is made of a slurry system composed of an aqueous solvent and a binder polymer, or a slurry system composed of an oily solvent and a binder polymer; the binder polymer, Including one or more of polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-trifluoropropylene, acrylate and other derivatives; the oily solvent is acetone , tetrahydrofuran, N-methylpyrrolidone (NMP), dichloromethane, chloroform, or a mixture of any two or more. The slurry system of the adhesive layer is preferably a slurry system of an oily solvent and polyvinylidene fluoride or polyvinylidene fluoride-hexafluoropropylene solution; the adhesive layer contains ceramic particles...

Embodiment 2

[0063] The difference from Example 1 is:

[0064] A1. Preparation of bare cells: Assemble the single-tab positive electrode sheet, the single-tab negative electrode sheet, and the rubber-coated separator in a laminated manner to form a bare cell. The thickness of the bare cell is 4.2-4.7mm.

[0065] The preparation of the shell, the shell of this embodiment is a single inner pit shell;

[0066] A2. Put the bare cell into the inner pit, wrap the shell with the bare cell and fold it in half before packaging. After packaging, bake and infiltrate in turn to prepare the cell 07 to be formed.

[0067] After completing the above steps, install the silicone pad 04 on the splint 01 of the fixture, and the L-shaped short side plate surface needs to be installed at the end where the tab 05 is placed. In this embodiment, since the shell is a single-pit shell, a silicone pad 04 is installed on the splint 01 of the fixture on the side of the pit. After the silicone pad 04 is installed, t...

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Abstract

The invention discloses a silica gel pad. The silica gel pad has an L-shaped board surface structure, an angle is formed between two board surfaces of the silica gel pad, and an airtight hollow chamber is arranged inside the silica gel pad. In the formation process of preparing lithium-ion batteries, the silica gel gasket of the present invention is used to buckle the deep pit surface of the battery cell, so that the hollow chamber in the long side plate surface of the silica gel pad covers the main part of the battery cell, so that the silica gel pad The short side of the board is fastened to the head of the cell, and the bottom of the short side of the board is against the top sealing edge. The diaphragm of the battery cell adopts a rubber-coated diaphragm, combined with high-temperature fixture formation, which can form the cell head and the cell body without pressure difference. After formation, the diaphragm of the cell head can be tightly bonded to the pole piece. In this way, the transmission path of lithium ions during the charging and discharging process is reduced to ensure that lithium precipitation will not occur after multiple charging and discharging. The silica gel pad of the invention has simple structure, simple and feasible application method, and is convenient for realizing mass production. The invention is applied in the field of battery technology.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a silica gel pad and its application in the preparation of lithium-ion batteries. Background technique [0002] With the rapid development of today's science and technology, electronic information products occupy an increasingly important position in people's daily life. Lithium-ion batteries have become indispensable chemical power sources due to their high energy density, long cycle life, and high operating voltage. Compared with lithium-ion batteries with steel shells and aluminum shells, soft-pack lithium-ion batteries are growing rapidly due to their advantages such as light weight, good safety performance, unlimited shape, and simple protection design. [0003] In order to reduce the internal resistance and DCR of the battery, multi-tab winding and stacking processes have become the preferred process for the manufacture of bare cells for soft-packed lithium-i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/44H01M10/0525
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 林珍艳易四勇李景夫舒民林洋
Owner 余姚市海泰贸易有限公司
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