Manufacturing process for battery pole piece

A technology for battery pole pieces and manufacturing methods, which is applied in the direction of electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of easy falling off of active materials, low cycle life, short circuit of batteries, etc., and achieve improved bonding effect, increased energy density, and reduced The effect of safety hazards

Inactive Publication Date: 2009-07-08
极致动力科技(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the dry method is that the pole piece is hard, the active material is easy to fall off, it is easy to cause a short circuit of the battery, and the cycle life is low

Method used

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  • Manufacturing process for battery pole piece
  • Manufacturing process for battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] see figure 1 , First spray the slurry on the battery baseband, the slurry is composed of alcohol mixed with water and ethanol, and then sprinkle the active material and additive mixed powder on the battery baseband, then roll and cut into battery pole pieces .

Embodiment 2

[0021] see figure 2 , first brush the slurry on the battery baseband, the slurry is mixed with 1 kg of water, 0.35 kg of PTFE as a binder, and 0.05 kg of nickel powder as a conductive agent (if a certain concentration of PTFE emulsion is used , the amount of water can be reduced accordingly), then brush the mixed powder of the active material and the additive into the base tape coated with the slurry, and then spray a layer of the above slurry on its surface, then flatten it, and finally cut it. , made into battery pole pieces.

Embodiment 3

[0023] like figure 2 As shown in the figure, firstly, brush the slurry on the battery base tape. The slurry is mixed with 1 kg of mixed solvent of N-methylpyrrolidone and ethanol in any proportion, polyvinyl alcohol and polyvinylidene fluoride in any proportion to form adhesive powder 0.02 kg, nickel powder and carbon powder are mixed in any proportion to form a conductive agent mixed powder of 0.1 kg, and then the mixed powder of the active material and the additive is rolled and pressed on the base tape coated with the slurry, and then sprayed on its surface. Layer the above slurry, then flatten it, and finally cut it to make a battery pole piece.

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Abstract

The invention discloses a battery electrode tab fabrication method, which comprises the following steps: (1) applying a paste on a battery base strip; (2) filling or compressing the mixture powder of an active substance and an additive on the battery base strip; and (3) rolling or flattening, and cutting into the battery electrode tabs. The paste contains a solvent, and also can contain a bonding agent and a conductive agent. The paste applied on the battery base strip can improve the bonding strength between the base strip and the mixture powder of the active substance and the additive to prevent falling off of the base strip, and can also soften the base strip, so as to obtain softer and thinner electrode tabs, thereby improving the energy density of the battery. The mixture powder of the active substance and the additive has little possibility to fall off during coiling; the bonding agent can improve the bonding effect; and the conductive agent can improve the conductive effect. Accordingly, the electrode tab fabricated by the method can achieve better comprehensive performance when used for producing batteries.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a method for manufacturing a battery pole piece. Background technique [0002] The battery is generally composed of positive electrode sheet, negative electrode sheet, diaphragm, electrolyte, shell and other components. Among them, the positive and negative plates are the key to the performance of the battery. The battery pole piece is made by adhering or filling the active material on the base tape. Generally, there are two production methods for pole pieces: wet method and dry method. The wet method is to mix the active material, additives and water into a paste and then coat it on the battery base tape, and then dry, roll or flatten, and cut into battery pole pieces. The disadvantage of the wet method is that the compaction density of the active material of the pole piece is low, and the utilization rate of the active material is low. The dry method is to directly fill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/62B05D1/02B05D1/18B05D1/00
CPCY02E60/12Y02E60/10
Inventor 陈风
Owner 极致动力科技(天津)有限公司
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