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Production method of pole piece with embedded tabs

A pole piece and tab technology, which is applied in the field of preparation of buried tab pole pieces, can solve the problems of unqualified batteries, increase battery thickness, and reduce battery energy density, so as to reduce internal resistance, increase cycle times, and reduce waiting time the effect of time

Active Publication Date: 2016-12-07
TIANJIN JUYUAN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Since there is no pole powder on the current collector of the welding tab, it is an empty foil. The empty foil in the battery pole piece structure reduces the energy density of the battery because it is not coated with pole powder.
[0004] 2. On the other hand, for polymer batteries, the hollow foil of the pole piece structure and the lugs on the empty foil are wound inside the pole group, which increases the thickness of the entire pole group itself, which in turn increases the battery life. Thickness, while polymer batteries have very strict requirements on thickness, and thickened batteries will have the risk of being unqualified

Method used

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  • Production method of pole piece with embedded tabs
  • Production method of pole piece with embedded tabs
  • Production method of pole piece with embedded tabs

Examples

Experimental program
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Effect test

preparation example Construction

[0029] The preparation method of the buried lug type pole piece of the present invention comprises the following steps,

[0030] 1) Pre-apply the foam tape on the predetermined position of the current collector, such as copper foil or aluminum foil. Among them, multiple ones can be applied on one side, or they can be applied on the front and rear sides of the current collector correspondingly. foam tape,

[0031] 2) Coat the slurry on the current collector pre-attached with the foam tape, and apply it as double-sided continuous coating or interval coating, or reserve a single-sided area at the end, but the foam tape and the surrounding The current collector at the place is fully coated, and then it is sent to the oven for drying, and at the same time the foam tape starts to thermally detackify and expand and curl, that is, the thermal detackification temperature and the expansion and curling temperature of the foam tape should be the same as those of the slurry That is, the d...

Embodiment 1

[0055] (1) Design buried lugs:

[0056] Carry out battery design according to the size requirements of the battery model. Taking the positive plate of polymer battery 405582 as an example, the length of the long powder side of the pole piece is 674mm, the length of the short powder side of the pole piece is 565mm, and the width is 74.8mm. mm, a series of pole piece parameters such as pole piece coating amount 41.70mg / cm2, rolling thickness 112μm, number of cut strips 2;

[0057] (2) Design parameters such as the size of the foam tape, the temperature of the foam tape and make the foam tape:

[0058] Using foam tape containing foamable microcapsules and chitosan polymer glue, according to the requirements of battery technology and welding tab technology, the size of the empty foil reserved for welding tabs is designed to be 22mm*10mm, that is The size of the foam tape is 22mm*10mm; according to the tape speed of 30m / min, the size of the coating oven is 8m, the maximum tempera...

Embodiment 2

[0068] (1) Design buried lugs:

[0069] Carry out battery design according to the size requirements of the battery model. Taking the positive plate of polymer battery 405582 as an example, the length of the long powder side of the pole piece is 674mm, the length of the short powder side of the pole piece is 565mm, and the width is 74.8mm. mm, a series of pole piece parameters such as pole piece coating amount 41.70mg / cm2, rolling thickness 112μm, number of cut strips 2;

[0070] (2) Design parameters such as the size of the foam tape, the temperature of the foam tape and make the foam tape:

[0071] Using foam tape containing foamable microcapsules and chitosan glue, according to the requirements of battery technology and welding tab technology, the size of the reserved blank area for welding tabs is designed to be 15mm*15mm, which is the size of the foam tape It is 15mm*15mm; according to the tape speed of 40m / min, the size of the coating oven is 8m, the maximum temperature...

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Abstract

The invention discloses a production method of a pole piece with embedded tabs. The production method includes the steps of firstly, pre-adhering foaming tape to the preset positions of a current collector; secondly, coating the current collector adhered with the foaming tape with slurry, and drying the coated current collector in a drying oven, wherein the viscosity of the foaming tape is removed under heat when preset temperature is reached, and the foaming tape expands and curls; thirdly, removing the curled foaming tape to obtain the pole piece with preserved blank areas; fourthly, grinding and shearing the pole piece to allow the preserved blank areas to be located at the edge on one side of the pole piece; fifthly, welding the tabs to the preserved blank areas. The production method has the advantages that comprehensive pole powder coating is achieved by using the foaming tape to cover part of areas, empty foil at the welding parts is reduced, the foaming tape expands, curls and falls under the preset temperature, the tabs can be welded into the pole piece, and a process assumption for freely designing the positions and sizes of the tabs becomes possible.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a method for preparing a buried ear-type pole piece. Background technique [0002] At present, lithium-ion batteries are divided into round batteries, square batteries, and polymer batteries. In the pole group structure, the tabs are basically on the current collector (copper foil or aluminum foil) on one side of the pole piece. Such a structure has the following disadvantages: [0003] 1. Since there is no pole powder on the current collector of the welding tab, it is an empty foil. The empty foil in the battery pole piece structure reduces the energy density of the battery because it is not coated with pole powder. [0004] 2. On the other hand, for polymer batteries, the hollow foil of the pole piece structure and the lugs on the empty foil are wound inside the pole group, which increases the thickness of the entire pole group itself, which in turn in...

Claims

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Application Information

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IPC IPC(8): H01M2/26H01M4/139H01M10/0525H01M10/0587H01M50/531
CPCH01M4/139H01M10/0525H01M10/0587H01M50/531Y02E60/10Y02P70/50
Inventor 张海源魏少臣谢富国王欣全张俊玉周江伍绍中
Owner TIANJIN JUYUAN NEW ENERGY TECH CO LTD