Battery cell, battery and preparation method thereof

A battery cell and tab technology, which is applied in the battery and its preparation, and the field of battery cells. It can solve the problems of low alignment accuracy, tight connection of reserved sub-tabs, and affecting the accuracy of the battery cell.

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

[0004] However, when multiple electrode sheets with the same polarity are stacked, the reserved sub-tabs cannot be inherently tightly bonded together, and are in a relatively loose state, even if they are pressed during the welding process, The alignment accuracy between the reserved tab and the external tab is not high, and there will be certain fluctuations in the positions of the reserved tab and the external tab after welding, which in turn affects the accuracy of the subsequent cell assembly process, resulting in battery failure. The problem of poor consistency of core specifications

Method used

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

Examples

Experimental program
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preparation example Construction

[0042] Further, the present invention also provides a method for preparing the above-mentioned electric core, which includes the following steps:

[0043] Each of the reserved positive pole ears is stacked to form a reserved positive pole ear, and each of the reserved negative pole ears is stacked to form a reserved negative pole ear. Prepare the positioning hole on the ear;

[0044] The positioning protrusions on the externally connected positive pole ear and the externally connected negative pole ear are completely inserted into the positioning holes on the reserved positive pole ear and the reserved negative pole ear, and respectively press the positioning protrusions, Each of the positioning protrusions is deformed so as to be snapped into the corresponding positioning holes.

[0045] In one specific example, when pressing each of the positioning protrusions, the pressure is 100kgf˜1000kgf.

[0046] In order to facilitate the understanding of the specific preparation pro...

Embodiment 1

[0066] (1) A plurality of positive electrode sheets and a plurality of negative electrode sheets are stacked alternately in sequence, wherein the total number of positive electrode sheets is 30, and the total number of negative electrode sheets is 31.

[0067] (2) The reserved positive tabs connected to each positive electrode are laminated to form the reserved positive tabs, press to reduce the gap between the reserved positive tabs, and use a puncher to place the reserved positive tabs at the preset position Punch out three positioning holes that are arranged side by side and run through the reserved positive tabs; make the reserved negative tabs connected to the negative plates stacked to form the reserved negative tabs, and place the reserved negative tabs in the same way as above Positioning holes are prepared above; wherein, each positioning hole is a cylindrical hole, and the diameter of the circular bottom surface is 3 mm. After the punching is completed, cut the part ...

experiment example

[0074]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 tab or negative tab was reserved for random inspection, and the external electrodes of all the battery samples were uniformly tested. The distance d between the lower end of the short side of the ear and the electrode body, the specific results can be seen in Table 1.

[0075] Table 1

[0076]

[0077]

[0078] The distance d between the lower end of the short side of the external tab and the main body of the electrode can reflect the alignment accuracy of the external tab. Specifically, if the alignment accuracy of the external tab is high, the fluctuation of the distance d between the lower end of the short side and the main body of the electrode is smaller in multiple samples.

[0079] As the data shown in Table 1, for Example 1, the measured d...

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Abstract

The invention provides a battery cell, a preparation method thereof and a battery. The battery cell comprises positive plates, negative plates, reserved positive tabs, reserved negative tabs, an external positive tab and an external negative tab; the number of the positive plates, the number of the negative plates, the number of the reserved positive sub-tabs and the number of the reserved negative sub-tabs are all multiple, the reserved positive sub-tabs are connected to all the positive plates, the reserved negative sub-tabs are connected to all the negative plates, and the multiple positive plates and the multiple negative plates are alternately arranged in a stacked mode; the plurality of reserved positive sub-tabs are laminated to form a reserved positive tab, the plurality of reserved negative sub-tabs are laminated to form a reserved negative tab, the reserved positive tab and the external positive tab are clamped through a positioning component, and the reserved negative tab and the external negative tab are clamped through a positioning component. According to the battery cell, the situation that the position of the external tab is greatly shifted can be effectively avoided, and the alignment accuracy of the external tab is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery cell, a battery and a preparation method thereof. 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 interval is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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