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Composite current collector, and electrode plate and battery cell comprising composite current collector

A technology of electrode pole pieces and current collectors, applied in the direction of electrode carriers/collectors, battery electrodes, lead-acid battery electrodes, etc., can solve problems such as reducing battery internal resistance, reduce charge transfer resistance, and reduce the probability of breakage , reducing the effect of inconsistency

Active Publication Date: 2021-01-12
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems in the use of this current collector: since the resistance of this current collector is much larger than that of ordinary pure metal foil, it is usually necessary to design a multi-layer tab structure inside the battery to reduce the resistance of the current collector. internal resistance of the battery

Method used

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  • Composite current collector, and electrode plate and battery cell comprising composite current collector
  • Composite current collector, and electrode plate and battery cell comprising composite current collector
  • Composite current collector, and electrode plate and battery cell comprising composite current collector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of the positive electrode sheet: On the surface of the PET film with a thickness of 12um, Al coatings are prepared on both sides of the PET film by vacuum deposition as positive current collectors, wherein the first area of ​​the Al coating and the third area of ​​the Al coating are The thickness is 0.36um, and the thickness of the second region and the fourth region of the Al coating is 1um. Coating the active material of lithium cobaltate uniformly on the first region and the third region of the positive current collector, and coating the second region and the fourth region of the positive current collector with an insulating layer with a width of 5 mm, Wherein the insulating layer is connected with the lithium cobalt oxide active material layer. After drying, the tabs are cut, stripped and cut to obtain the positive electrode sheet.

[0045] Preparation of the negative electrode sheet: use ordinary copper foil as the negative electrode current collector,...

Embodiment 2

[0048] Preparation of the positive pole piece: it is roughly the same as that in Example 1, except that the thickness of the second and fourth regions of the Al coating is 5 um.

[0049] Preparation of negative electrode: same as Example 1.

[0050] Preparation of battery cells: the same as in Example 1.

Embodiment 3

[0052] Preparation of the positive pole piece: roughly the same as in Embodiment 1, except that the thickness of the second and fourth regions of the Al coating is 10 um.

[0053] Preparation of negative electrode: same as Example 1.

[0054] Preparation of battery cells: the same as in Example 1.

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Abstract

The invention provides a composite current collector, which comprises a polymer layer comprising a first surface and a second surface opposite to the first surface; a first metal layer arranged on thefirst surface, wherein the first metal layer comprises a first area and a second area connected with the first area; wherein in the thickness direction of the composite current collector, the thickness of the second region is greater than that of the first region. The invention further provides an electrode pole piece and a battery cell comprising the composite current collector. By increasing the thickness of the second region, the charge transmission resistance of the tab is greatly reduced.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, and in particular to a composite current collector and an electrode sheet and a battery cell having the composite current collector. Background technique [0002] Lithium-ion batteries have the advantages of large specific energy, high working voltage, low self-discharge rate, small size, light weight, etc., and have a wide range of applications in the field of consumer electronics. However, with the rapid development of electric vehicles and mobile electronic devices, people's attention and requirements for battery safety are also increasing. [0003] As we all know, lithium batteries need to use metal foil (copper foil, aluminum foil, nickel foil, etc.) as a current collector to realize electron conduction. At present, there is a new type of composite current collector, which is a three-layer structure, the middle layer is a polymer layer, and there is a metal layer on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/78H01M4/66H01M4/13H01M10/0525
CPCH01M4/667H01M4/661H01M4/668H01M4/78H01M4/13H01M10/0525H01M4/66H01M4/70H01M4/525H01M4/587H01M10/0585H01M10/0587Y02E60/10H01M4/20H01M4/685H01M4/0409H01M4/80
Inventor 邵颖魏红梅李翔胡乔舒
Owner NINGDE AMPEREX TECH
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