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Lithium ion battery and combination method of pole pieces thereof

A lithium-ion battery and pole piece technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unfavorable mass production, expansion, and high equipment requirements, and achieve good rate discharge performance, simple operation, and good safety performance Effect

Inactive Publication Date: 2012-09-12
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantage is that due to the different circumferences of the winding inner ring and the outer ring, to ensure that the tabs are aligned after winding, the distance between the tabs on the pole piece must be different from each other, which requires accurate calculation and precision. Process control, any tab alignment error will cause the subsequent tab alignment error to multiply as the winding progresses, and the equipment requirements are extremely high, which is not conducive to mass production

Method used

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  • Lithium ion battery and combination method of pole pieces thereof
  • Lithium ion battery and combination method of pole pieces thereof
  • Lithium ion battery and combination method of pole pieces thereof

Examples

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Embodiment 1

[0047]Taking the prismatic lithium-ion battery of model 656790 (the thickness of the finished battery is 6.5mm, the width is 67mm, and the length is 90mm) as an example, the design capacity of the battery is 4Ah. Graphite is used as the negative electrode active material, and the negative electrode active material and the conductive agent, the binder and the thickener are made into a negative electrode slurry in a mass ratio of 94:2:2:2, coated on the negative electrode current collector 2, and subjected to cold pressing , slitting, and welding the negative electrode lug 1 on the head of the pole piece to prepare a negative pole piece; use LiCoO 2 As the positive electrode active material, the positive electrode active material, the conductive agent, and the binder are made into a positive electrode slurry in a mass ratio of 96:2:2, coated on the positive electrode current collector 5, and subjected to processes such as cold pressing, slitting, and welding. It is prepared as a...

Embodiment 2

[0064] Taking the prismatic lithium-ion battery of model 486789 (the thickness of the finished battery is 4.8mm, the width is 67mm, and the length is 89mm) as an example, the design capacity of the battery is 3Ah. Graphite is used as the negative electrode active material, and the negative electrode active material and the conductive agent, the binder and the thickener are made into a negative electrode slurry in a mass ratio of 94:2:2:2, coated on the negative electrode current collector 2, and subjected to cold pressing , slitting, welding and other processes to prepare a negative electrode sheet, wherein the negative electrode sheet includes four negative electrode tabs 1 evenly distributed on the negative electrode sheet (see Figure 6 ); using LiCoO 2 As the positive electrode active material, the positive electrode active material, the conductive agent, and the binder are made into a positive electrode slurry in a mass ratio of 96:2:2, coated on the positive electrode cu...

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Abstract

The invention relates to the technical field of lithium ion battery, in particular to a lithium ion battery, which comprises a battery cell, a packaging bag containing the battery cell, and an electrolyte filled in the battery cell and the packaging bag. The battery cell comprises positive pole pieces, negative pole pieces, and isolating films spaced between the positive pole pieces and the negative pole pieces, wherein head parts of the positive pole pieces and head parts of the negative pole pieces are mutually perpendicular and overlapping, and the positive pole pieces and the negative pole pieces are folded crosswise in a Z shape. Compared with the prior art, the lithium ion battery of the invention comprises a smaller amount of pole pieces, no multi-battery parallel structure with a lamination structure will be formed, and security performance of the battery is ensured; the positive pole pieces and the negative pole pieces are sequentially folded crosswise in a Z shape, layers of the pole pieces are arranged according to a feature which is similar to the lamination structure, same force is exerted on pole piece in each layer, internal stresses between the layers of the battery pole pieces are distributed uniformly, and the battery is not deformable. In addition, the invention further discloses a combination method of pole pieces of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and more specifically, the invention relates to a lithium ion battery and a pole piece assembly method thereof. Background technique [0002] A lithium-ion battery generally includes a battery cell, a packaging bag for containing the battery cell, and an electrolyte filled in the battery cell and the packaging bag. Wherein, the battery cell is generally composed of a positive electrode sheet, a negative electrode sheet and a diaphragm spaced between the positive electrode sheet and the negative electrode sheet. At present, the preparation process of the battery generally includes two types, namely the stacking process and the winding process. [0003] Among them, the cell stacking process is to alternately stack positive and negative plates of a certain size together with a separator in the middle. Since each positive electrode sheet and negative electrode sheet are independent of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M4/139
CPCY02E60/10Y02P70/50
Inventor 李真苏树发李萍史册王彦平何东铭
Owner NINGDE AMPEREX TECH
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