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Cell pole piece and lithium ion battery cell

A pole piece and cell technology, which is applied in the field of secondary battery cells, can solve the problems of low energy density and heavy cell weight, and achieve the effects of increasing energy density, reducing weight, and stabilizing the structure

Pending Publication Date: 2017-11-21
ETRUST POWER ETP GRP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing lithium-ion battery cells are heavy in weight and low in energy density, which cannot meet the needs of the market

Method used

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  • Cell pole piece and lithium ion battery cell
  • Cell pole piece and lithium ion battery cell
  • Cell pole piece and lithium ion battery cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] see figure 1 , a lithium-ion battery cell, comprising a positive cell pole piece 100 wound together after lamination, a negative battery pole piece 200 and a separator 300, the separator 300 is located on the positive battery pole piece 100 and the negative battery pole piece 200 between.

[0024] see figure 1 and figure 2 , both the positive battery pole piece 100 and the negative battery pole piece 200 are battery pole pieces. The electrode sheet of the battery cell includes a current collector 1 and an active material layer 2. The current collector 1 is provided with a plurality of through holes 11, and the plurality of through holes 11 are a plurality of through holes arranged in a matrix. Preferably, the shape of the through hole 11 is circular, polygonal or irregular. When the through hole 11 is circular, the diameter of the through hole 11 is 1-10 mm. In this embodiment, the diameter of the through hole 11 is 9 mm. The through hole 11 is coated with a cond...

Embodiment 2

[0028] The difference between this embodiment and Embodiment 1 is that the number of through holes 11 of the positive electrode sheet and the negative electrode sheet is 100, arranged in a 5×20 (number of rows×number of columns) arrangement.

Embodiment 3

[0030] The difference between this embodiment and Embodiment 1 is that the number of through-holes 11 of the positive electrode sheet and the negative electrode sheet is 80, arranged in a 4×20 (number of rows×number of columns) arrangement.

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Abstract

The invention provides a cell pole piece and a lithium ion battery cell. The cell pole piece comprises a current collector and active material layers, wherein a plurality of through holes are formed in the current collector; the interior of each through hole is coated with a conductive polymer material layer; a front surface and a back surface of the current collector are coated with the active material layers; the lithium-ion battery cell comprises a positive cell pole piece, a negative cell pole piece and an isolation membrane which are wound together after lamination; the isolation membrane is located between the positive cell pole piece and the negative cell pole piece. The through holes are formed in the cell pole piece so that the weight of the current collector can be reduced; interiors of the through holes are coated with the conductive polymer material layers so that an attachment basis can be provided for the active material layers, the coating effects of the active material layers and the current collector are relatively better, the active material layers on the through holes do not collapse, the structure is stable, and the energy density is improved; the above lithium ion battery cell reduces the weight of the lithium ion battery cell and improves the energy density of the entire lithium ion battery cell.

Description

technical field [0001] The invention relates to the field of secondary battery cells, in particular to a cell pole piece and a lithium ion battery cell. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high cycle performance, high voltage, low self-discharge and light weight, and are widely used in electronic equipment and new energy vehicles. With the development of the commercialization of secondary batteries, people have higher and higher requirements for the performance of lithium-ion batteries, especially for the energy density of lithium-ion batteries. [0003] Existing lithium-ion battery cells are generally wound from a positive pole piece, a negative pole piece, and a diaphragm arranged between the positive pole piece and the negative pole piece. However, the existing lithium-ion battery cells are heavy and have low energy density, which cannot meet the market demand. Contents of the invention [0004] Based on this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M10/0525
CPCH01M4/667H01M4/80H01M10/0525Y02E60/10
Inventor 陈静夏年鑫赵晓月吴清真周新萍
Owner ETRUST POWER ETP GRP LTD
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