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Preparation method of composite current collector

A current collector and coating technology, which is applied in the direction of electrode carrier/current collector, electrical components, battery electrodes, etc., can solve the problem that the conductor layers on both sides of the composite current collector are difficult to achieve conduction, so as to improve the production efficiency and reduce the difficulty of the process , The effect of reducing the internal resistance of the battery

Pending Publication Date: 2022-03-18
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of a composite current collector to solve the problem of tab welding of the composite current collector in the prior art, and the problem that the conductor layers on both sides of the composite current collector are difficult to achieve conduction

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  • Preparation method of composite current collector

Examples

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Effect test

Embodiment 1

[0026] A preparation method of a composite current collector, specifically comprising the following steps:

[0027] (1), select polyethylene terephthalate as the insulating support layer, and coat a layer of metal aluminum coating with a thickness of 1 μm on both sides of the insulating support layer by vacuum evaporation, and each layer of metal aluminum coating is uniform. It includes a plurality of coating areas 01, and a blank area 02 is left between two adjacent coating areas 01 (see figure 1 ), and then the insulating supporting layer after coating is cut, and each insulating supporting layer after cutting includes a corresponding coating area 01 on its two sides, and the coating area 01 of each insulating supporting layer after cutting is There are blank areas 02 on both sides, that is, the plating area 01 on each insulating support layer is located between the blank areas 02 on both sides;

[0028] (2), see figure 2 The inner end of the aluminum foil 11 with a trape...

Embodiment 2

[0031] A preparation method of a composite current collector, specifically comprising the following steps:

[0032] (1), choose polyethylene terephthalate as the insulating support layer, and coat a layer of metal aluminum coating with a thickness of 1.1 μm on both sides of the insulating support layer by vacuum evaporation, and each layer of metal aluminum coating Each includes a plurality of coating areas 01, and a blank area 02 is left between two adjacent coating areas 01 (see figure 1 ), and then the insulating supporting layer after coating is cut, and each insulating supporting layer after cutting includes a corresponding coating area 01 on its two sides, and the coating area 01 of each insulating supporting layer after cutting is There are blank areas 02 on both sides, that is, the plating area 01 on each insulating support layer is located between the blank areas 02 on both sides;

[0033] (2), see figure 2 The inner end of the aluminum foil 11 with a trapezoidal l...

Embodiment 3

[0036] A preparation method of a composite current collector, specifically comprising the following steps:

[0037] (1), choose polyethylene terephthalate as the insulating support layer, and coat a layer of metal aluminum coating with a thickness of 1.2 μm on both sides of the insulating support layer by vacuum evaporation, and each layer of metal aluminum coating Each includes a plurality of coating areas 01, and a blank area 02 is left between two adjacent coating areas 01 (see figure 1 ), and then the insulating supporting layer after coating is cut, and each insulating supporting layer after cutting includes a corresponding coating area 01 on its two sides, and the coating area 01 of each insulating supporting layer after cutting is There are blank areas 02 on both sides, that is, the plating area 01 on each insulating support layer is located between the blank areas 02 on both sides;

[0038] (2), see figure 2 The inner end of the aluminum foil 11 with a trapezoidal l...

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Abstract

The invention discloses a preparation method of a composite current collector, which comprises the following steps of: firstly, forming plating layers on two side surfaces of an insulating support layer in a film coating manner, and reserving blank areas on the two side surfaces of the insulating support layer and on the two sides of the plating layers, namely, the plating layers are positioned between the blank areas on the two sides; and then the inner ends of the metal foils are connected to the blank areas on the two side faces of the insulating supporting layer in a coating and gluing mode, the outer ends of the metal foils extend to the outer portion of the insulating supporting layer, and the metal foils and the plating layer are stably connected in a welding mode. According to the prepared composite current collector, tabs do not need to be led out in a welding mode, the insulating supporting layer is directly bonded with the metal foil in a coating and gluing mode, the part, extending out of the insulating supporting layer, of the metal foil serves as the tabs, the tab parts are welded to each other, electric conduction of the two plating layers is achieved, the internal resistance of the battery is reduced, and the service life of the battery is prolonged. And the production yield is improved, and the connection stability of the tabs and the use stability of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing a composite current collector. Background technique [0002] With the continuous development of the lithium-ion battery industry, people are increasingly pursuing high energy density and lightweight batteries. The current collector is an important part of the battery, and it is an effective method to reduce the quality of the current collector. At present, the method of reducing the current collector is mainly realized by compounding a thin film support layer and a conductive metal layer to form a composite current collector. [0003] The common method of welding the tabs of the existing composite current collector is to introduce an external aluminum foil and weld the metal conductor layer of the composite current collector, extrude the polymer layer in the middle of the conductor layer through ultrasonic welding equipment, and weld the metal con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M50/531
CPCH01M4/667H01M4/661H01M50/531Y02E60/10
Inventor 陈启武许涛王磊张江伟王义飞
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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