Power lithium-ion battery with heat dissipation performance

A lithium-ion battery, heat dissipation technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of high consistency requirements, poor high power performance, poor overall heat dissipation, etc. Improve electrochemical performance, increase output current, and improve the effect of heat transfer

Inactive Publication Date: 2010-10-20
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these structures are: the lamination structure reduces the internal resistance of the battery to a large extent, but the alignment between the positive and negative electrodes is very difficult, and the overall heat dissipation is poor; The battery structure in which multiple tabs are welded on the pole piece and multiple tabs are connected in parallel can only improve the internal resistance of the battery to a certain extent, but its high power performance is still relatively poor, and the battery structure of each winding cell Consistency requirements are high, processing efficiency is low

Method used

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  • Power lithium-ion battery with heat dissipation performance
  • Power lithium-ion battery with heat dissipation performance
  • Power lithium-ion battery with heat dissipation performance

Examples

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Embodiment approach 1

[0020] Embodiment 1, such as Figure 1 to Figure 3 As shown, the present invention provides a power type lithium ion battery with heat dissipation performance, which includes a positive pole piece 4, a negative pole piece 2 and a separator (not shown), the electrode pole piece includes a current collector and is coated on the collector. Active substance diaphragm on fluid. Wherein, the negative electrode current collector has a plurality of negative electrode extensions 1 extending in its width direction, and the positive electrode current collector has a plurality of positive electrode extensions 3 extending in its width direction. Such as Figure 4 As shown, after the positive and negative electrode pieces and the separator are wound to form the battery core 7, the extensions provided on the positive and negative current collectors are combined together to form the negative tab 5 and the positive tab 6, respectively. The positive and negative tabs are formed at the same en...

Embodiment approach 2

[0023] Implementation mode two: if Figure 5 As shown, as another mode of the power lithium-ion battery with heat dissipation performance of the present invention, the positive and negative pole tabs are formed at both ends of the battery, and the basic structure of the positive and negative poles is the same as that of Example 1, except that the pole pieces Dimensions vary.

[0024] In this embodiment, the theoretical design capacity of the cell is 3.5Ah, and Li 4 Ti 5 o 12 As the negative electrode active material, the negative electrode active material, the conductive agent, the binder, etc. are made into a negative electrode slurry according to a certain ratio, and coated on the negative electrode current collector to make the negative electrode sheet; the positive electrode active material of the battery adopts composite metal oxide , such as LiMn 2 o 4 , LiNiCoMnO 2 etc., positive electrode active material and binder, conductive agent, etc. are made into positive e...

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Abstract

The invention discloses a power lithium-ion battery with heat dissipation performance, comprising a positive electrode pole piece, a negative electrode pole piece and an isolating membrane, wherein the positive electrode pole piece and the negative electrode pole piece comprise a current collector and an active material membrane coated on the current collector; the current collector is provided with a plurality of extending parts in an extending manner in the width direction; when the positive and negative electrode pole pieces and the isolation membrane coil to form battery cells, the extending parts arranged on the current collectors of the positive and negative electrodes are fixed together to respectively form positive and negative electrode tabs; the above battery cells are connected with the external circuit electrically through the positive and negative electrode tabs. In the lithium-ion battery with the above structure, the positive and negative electrode pole pieces are provided with tabs constituted by the plurality of the extending parts, thus greatly increasing the distributary capability during charge-discharge of great current of current collector tabs, and lowering internal resistance of the battery. When the battery emits heat, heat dissipation can be carried out through multiple extending parts of current collectors.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a power type lithium ion battery with heat dissipation performance. Background technique [0002] At present, many low-internal-resistance, high-power lithium-ion batteries adopt a structure in which stacked sheets or multiple wound cells are connected in parallel. The disadvantages of these structures are: the lamination structure reduces the internal resistance of the battery to a large extent, but the alignment between the positive and negative electrodes is very difficult, and the overall heat dissipation is poor; The battery structure in which multiple tabs are welded on the pole pieces and connected in parallel can only improve the internal resistance of the battery to a certain extent, but its high-power performance is still relatively poor, and the battery structure of each winding cell Consistency requirements are high, and processing efficiency is low. [0003] In view of this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M10/40H01M4/64H01M2/26H01M50/533
CPCY02E60/10
Inventor 夏恒涛赵丰刚许瑞蔡开贵朱坤庆陈卫曾毓群
Owner DONGGUAN AMPEREX TECH
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