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Preparation method for tab-embedded type electrode plate, electrode plate and lithium ion battery

A technology of positive pole piece and negative pole piece, which is applied in the field of lithium-ion battery preparation, can solve the problems of reducing battery energy density, increasing battery thickness, and unqualified battery, so as to reduce internal resistance, increase cycle times, and increase energy density. Effect

Pending Publication Date: 2017-02-22
天津聚元新能源科技有限公司
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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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  • Preparation method for tab-embedded type electrode plate, electrode plate and lithium ion battery
  • Preparation method for tab-embedded type electrode plate, electrode plate and lithium ion battery
  • Preparation method for tab-embedded type electrode plate, electrode plate and lithium ion battery

Examples

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preparation example Construction

[0042] The preparation method of the wound pole group of the present invention includes the preparation method and the winding method of the buried tab pole piece, wherein the preparation method of the buried tab pole piece comprises the following steps,

[0043] 1) Pre-apply the foam tape on the predetermined position of the current collector, that is, the foil, such as copper foil or aluminum foil. Among them, multiple layers can be applied on one side, or on the front and rear sides of the foil respectively. covered with foam tape,

[0044] 2) Coat the slurry on the pre-attached foam tape foil, and then send it into the oven to dry, while the foam tape begins to thermally detackify and curl, that is, the thermal detackification temperature and curl of the foam tape The temperature should correspond to the drying temperature and drying time of the slurry, that is, the powder. For the foam tape, it is enough to select the corresponding microcapsules and tape components. No fu...

Embodiment 1

[0072] (1) Design buried lugs:

[0073] 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;

[0074] (2) Design parameters such as the size of the foam tape, the temperature of the foam tape and make the foam tape:

[0075] Using foam tape containing foamable microcapsules and chitosan glue, according to the requirements of battery technology and welding tab technology, the size of the empty foil reserved for welding tabs is 22mm*10mm, that is, the size of the foam tape is 22mm *10mm; According to the tape speed of 3m / min, the size of the coating oven is 8m, the maximum temperature of coating and dr...

Embodiment 2

[0085] (1) Design buried lugs:

[0086] 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;

[0087] (2) Design parameters such as the size of the foam tape, the temperature of the foam tape and make the foam tape:

[0088] 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 3m / min, the size of the coating oven is 8m, the maximum temperature ...

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Abstract

The invention discloses a winding type winding. The winding type winding comprises a positive electrode, a negative plate and a diaphragm, wherein the positive plate comprises a positive electrode plate and a positive electrode tab; the negative plate comprises a negative electrode plate and a negative electrode tab; the upper and lower side faces, except reserved blank regions, on the positive electrode plate and the negative electrode plate are both coated with electrode powder; the reserved blank regions are positioned on the edges of the electrode plates, and are corresponding to the positive electrode tab or the negative electrode tab in terms of size; the positive electrode tab or the negative electrode tab is correspondingly welded in the corresponding reserved blank regions; the front and back side surfaces, in the welding position of the positive electrode tab, of the positive electrode plate are correspondingly coated with positive electrode protection adhesive tapes to accommodate the positive electrode reserved blank region therein; and two corresponding adjacent positive electrode plates of the negative electrode tab and adjacent surfaces of the negative electrode tab are coated with negative protection adhesive tapes respectively so as to cover the negative electrode reserved blank region therebetween.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a preparation method of a buried ear-type pole piece, a pole piece and a lithium-ion battery. 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 e...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M2/26H01M10/0525H01M50/531
CPCH01M10/0525H01M10/0587H01M50/531Y02E60/10Y02P70/50
Inventor 张海源魏少臣谢富国王欣全张俊玉周江伍绍中
Owner 天津聚元新能源科技有限公司
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