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Technology for improving wavy shapes of lithium ion battery positive plate edge

A lithium-ion battery and positive electrode technology, which is applied in battery electrodes, electrode manufacturing, electrode heat treatment, etc., can solve the problem of inconsistent tension and tightness on both sides of the electrode, and achieve the effect of ensuring the orderly winding and tension, and avoiding internal short circuits.

Inactive Publication Date: 2018-06-29
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a process for improving the wave shape of the edge of the positive plate of the lithium-ion battery, which can effectively solve the problems of inconsistent tension and tightness on both sides of the positive plate after stripping, and ensure the consistency of the uniformity of the battery

Method used

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  • Technology for improving wavy shapes of lithium ion battery positive plate edge
  • Technology for improving wavy shapes of lithium ion battery positive plate edge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A process for improving the wavy shape of the edge of the positive electrode sheet of a lithium ion battery, and the specific steps are as follows:

[0015] Step 1: The rolled lithium-ion battery positive sheet is wound using a hot-pressed silica gel roll with an inner diameter of 5mm;

[0016] Step 2: After the winding is completed, put the positive electrode sheet in the oven without vacuuming and bake it for 2 hours at a temperature of 100°C;

[0017] Step 3: After the baking time is over, the pole piece rolls are cooled to room temperature and then slit to make positive pole pieces.

Embodiment 2

[0019] A process for improving the wavy shape of the edge of the positive electrode sheet of a lithium ion battery, and the specific steps are as follows:

[0020] Step 1: The rolled lithium-ion battery positive sheet is wound using a hot-pressed silicone rubber roll with an inner diameter of 7.5mm;

[0021] Step 2: After the winding is completed, put the positive electrode sheet in the oven without vacuuming and bake for 3 hours at 110°C;

[0022] Step 3: After the baking time is over, the pole piece rolls are cooled to room temperature and then slit to make positive pole pieces.

Embodiment 3

[0024] A process for improving the wavy shape of the edge of the positive electrode sheet of a lithium ion battery, and the specific steps are as follows:

[0025] Step 1: The rolled lithium-ion battery positive sheet is wound with a hot-pressed silica gel roll with an inner diameter of 10mm;

[0026] Step 2: After the winding is completed, put the positive electrode sheet in the oven without vacuuming and bake it for 4 hours at a temperature of 120°C;

[0027] Step 3: After the baking time is over, the pole piece rolls are cooled to room temperature and then slit to make positive pole pieces.

[0028] The positive plates of the lithium-ion batteries prepared in the above examples 1-3 have no edge wave shape, so that when the lithium-ion battery cell is wound, there will be no misalignment or misalignment of the pole pieces, thereby avoiding the use of the lithium-ion battery The internal short circuit during the process reduces potential safety hazards such as fire and explosion of t...

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Abstract

The invention discloses a technology for improving the wavy shape of the edge of a lithium ion battery positive plate. The technology comprises the following steps: (1) rolling the laminated lithium ion battery positive plate by using a hot-pressing silica gel skin material with the inner diameter of 5 to 10 mm; (2) after rolling, putting the positive plate into an oven without vacuum pumping forbaking for 2 to 4 h, wherein the baking temperature is 100 to 120 DEG C; and (3) after baking, cooling a plate roll to the room temperature, carrying out stripping to prepare the positive plate. The laminated positive plate is rolled by using the silica gel skin material, the rebound and stress of the plate during rolling can be buffered effectively, and the uniform rolling orderliness and tensionof the plate are guaranteed; the pressure of the plate is released by baking the plate at high temperature, uniform stress of the plate during stripping is guaranteed, and the wavy shape of the edgeof the positive plate is avoided. Therefore, internal short circuits of a lithium ion battery in the using process are avoided, and the potential safety hazards, such as fire and explosion, of the lithium ion battery are reduced.

Description

Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a process for improving the wave shape of the edge of a positive electrode sheet of a lithium ion battery. Background technique [0002] Pole piece rolling is an essential process for lithium-ion batteries. People have higher and higher requirements for battery power and energy density. The compaction density of the positive electrode sheet after rolling is getting higher and higher, which leads to the transitional extension of the edge of the positive sheet after rolling. Release in time, the edge of the pole piece is prone to "wave" phenomenon, resulting in uneven tension and tightness on both sides of the pole piece, resulting in uneven or misaligned winding of the battery core behind, which will easily cause the lithium-ion battery in the use process An internal short circuit may cause safety hazards such as battery fire and explosion. Summary of the invention [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04
CPCH01M4/0471H01M4/139Y02E60/10
Inventor 黄锐升王勇军李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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