Unit pole piece preparation method, unit pole piece and lithium battery

A pole piece and foil technology, which is applied in the field of cell preparation, can solve the problems of high production cost and large slurry waste, and achieve the effects of preventing slurry waste, avoiding slurry waste, and saving production costs

Active Publication Date: 2021-10-08
兰钧新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]Since the slurry has been coated on the foil before slitting and die-cutting, during the slitting and die-cutting

Method used

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  • Unit pole piece preparation method, unit pole piece and lithium battery
  • Unit pole piece preparation method, unit pole piece and lithium battery
  • Unit pole piece preparation method, unit pole piece and lithium battery

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Embodiment

[0053] see figure 1 , figure 1 Shown is a flow chart of the method for preparing a unit pole piece provided in this embodiment. The method for preparing a unit pole piece can avoid waste of slurry and save production costs. The preparation method of the unit pole piece comprises the following steps:

[0054]Step S101, preparing slurry.

[0055] Mix the powder with the solvent to obtain a slurry that meets the process requirements. In order to prevent the slurry from cracking and falling off after coating, in this embodiment, the prepared slurry has a solid content of 75% to 85% and a viscosity of 5000mpas to 100000mpas.

[0056] Moreover, after the preparation of the slurry is completed, the slurry needs to be sealed and stored in an environment with a humidity less than or equal to 20%.

[0057] Step S102, embossing the foil.

[0058] see figure 2 , figure 2 Shown is a schematic cross-sectional view of the foil after it has been embossed. In this embodiment, an embo...

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Abstract

The invention discloses a unit pole piece preparation method, a unit pole piece and a lithium battery, and relates to the technical field of battery cell preparation. The preparation method of the unit pole piece comprises the following steps: preparing slurry; enabling the foil to be subjected to embossing treatment, so that blank areas are formed on the two sides of the foil in the longitudinal direction, and a calendering area with concave-convex lines is formed between the two blank areas; cutting the embossed foil to obtain a unit foil with a tab, wherein the unit foil comprises a blank area and a calendering area, and the tab is formed by the blank area; coating a calendering area of a unit foil with the slurry to obtain a coated sheet; drying the film coating sheet; and carrying out hot rolling on the dried film coating sheet to obtain the unit pole piece. The preparation method of the unit pole piece provided by the invention can avoid waste of slurry and save the production cost.

Description

technical field [0001] The invention relates to the technical field of cell preparation, in particular to a method for preparing a unit pole piece, a unit pole piece and a lithium battery. Background technique [0002] At present, in the process of preparing unit pole pieces on the market, the process sequence of pulping, coating, baking, rolling, slitting, and die-cutting is usually carried out. [0003] Since the slurry has been coated on the foil before the slitting and die-cutting, the cut-off scraps are attached with the slurry during the slitting and die-cutting process, and the waste of the slurry is huge, resulting in high production cost. Contents of the invention [0004] The purpose of the present invention is to provide a method for preparing unit pole pieces, which can avoid slurry waste and save production costs. [0005] Another object of the present invention is to provide a unit pole piece with lower production cost. [0006] Another object of the presen...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/13H01M4/139H01M10/052
CPCH01M4/0404H01M4/0435H01M4/0471H01M4/13H01M4/139H01M10/052Y02E60/10
Inventor 张卫龙
Owner 兰钧新能源科技有限公司
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