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Battery cell preparation method, battery cell and battery

A technology of cells and electrode sheets, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as short circuit of cells, affecting cell performance, safety, and escape.

Inactive Publication Date: 2021-09-07
昆山聚创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

However, a large amount of tiny metal dust will be produced during the above-mentioned ultrasonic welding process. These metal dusts may escape to the electrode sheet with the air, which may lead to an increase in the self-discharge of the battery cell, and may cause a short circuit of the battery cell in severe cases. Affect battery performance and safety

Method used

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  • Battery cell preparation method, battery cell and battery
  • Battery cell preparation method, battery cell and battery
  • Battery cell preparation method, battery cell and battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] According to an embodiment of the present invention, a method for preparing a soft-packed battery cell includes the following steps:

[0024] A plurality of electrode sheets are stacked, and the electrode sheets are independently connected with reserved sub-tabs, wherein the plurality of electrode sheets include a plurality of positive electrode sheets and a plurality of negative electrode sheets that are alternately stacked;

[0025] The reserved sub-tabs connected to the electrode sheets of the same electrical polarity are stacked and arranged, and the adjacent reserved sub-tabs are bonded with conductive glue to prepare the reserved tabs;

[0026] Bond the external tab and reserved tab with conductive glue.

[0027] Wherein, the electrode sheet is a sheet-shaped electrode material formed after the electrode material is coated on the surface of the current collector. According to its discharge properties, it can be divided into positive electrode sheets and negative ...

Embodiment 1

[0062] (1) A plurality of electrode sheets are sequentially stacked to form an electrode body. Among them, the total number of positive pole pieces is 30, and the total number of negative pole pieces is 31. The positive pole pieces and the negative pole pieces are stacked alternately. The reserved sub-tab on the positive pole piece is located at the right end of the positive pole piece. The sub-tab is located at the left end of the negative plate.

[0063] (2) In the process of laying each positive electrode sheet and negative electrode sheet, the adhesive conductive paste is scraped on the exposed side of each reserved sub-tab correspondingly, and the glue is applied along the short side parallel to the reserved sub-tab. The edge area is coated with glue, the width of the glue is 3mm, and the length of the glue is 43mm of the short side length of the reserved sub-tab, by applying 0.5kgf / cm 2 Press the reserved sub-tab set later to the reserved sub-tab set earlier; repeat thi...

experiment example

[0072] According to the preparation method as in Example 1, 30 battery samples were prepared, and at the same time, 30 battery samples were prepared according to the preparation method of Comparative Example 1, and the positive tabs or negative tabs were randomly checked, and all the battery samples were tested uniformly. The discharge level is expressed by its self-discharge rate ΔV, and the specific test results of ΔV can be seen in Table 1.

[0073] Table 1

[0074]

[0075]

[0076] Among them, the higher the ΔV, the higher the self-discharge rate.

[0077] As shown in Table 1, for Example 1, the measured maximum value of ΔV is 0.00016, the measured minimum value of ΔV is 0.00011, the difference between the maximum and minimum values ​​is 0.00005, and the average value of ΔV is 0.00013. For Comparative Example 1, the measured maximum value of ΔV was 0.0002, the measured minimum value of ΔV was 0.00011, the difference between the maximum and minimum values ​​was 0.00...

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Abstract

The invention provides a preparation method of a battery cell, the battery cell and a battery, and the preparation method comprises the following steps: stacking a plurality of electrode plates, and enabling the electrode plates to be respectively and independently connected with reserved sub-tabs, wherein the plurality of electrode plates comprise a plurality of positive plates and a plurality of negative plates which are alternately stacked; stacking the reserved sub-tabs connected with the electrode plates with the same electric polarity, and bonding the adjacent reserved sub-tabs with a conductive adhesive to prepare a reserved tab; and bonding the external tab with the reserved tab through a conductive adhesive. According to the preparation method of the battery cell, metal dust generated in the ultrasonic welding step can be avoided, and the amount of the metal dust generated in the preparation process of the battery is effectively reduced. And according to an experimental detection result, the reserved sub-tabs and the external tabs are bonded by adopting a conductive adhesive bonding mode, so that the self-discharge condition of the battery can be obviously weakened.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for preparing an electric core, an electric core and a battery. Background technique [0002] Compared with the traditional cylindrical battery, the biggest feature of the pouch battery is that the electrode sheet is packaged in a polymer wrapping bag, and the electrode sheet includes a positive electrode sheet and a negative electrode sheet that are oppositely arranged. In order to increase the volume specific energy of the cell, when arranging the electrode sheets, it is usually necessary to stack the electrode sheets in such a way that a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately stacked. [0003] In order to facilitate the conduction between the electrode sheet in the battery cell and the external circuit, reserved sub-tabs are usually drawn out in advance on the current collector of the electrode sheet. The...

Claims

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Application Information

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IPC IPC(8): H01M50/533H01M50/536
CPCH01M50/533H01M50/536Y02E60/10
Inventor 常柯李奎梁慧新姜守钟
Owner 昆山聚创新能源科技有限公司
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