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Lithium ion battery structure and tab electric connection method

A lithium-ion battery and negative electrode connection technology, which is applied to small-sized batteries/battery packs, structural parts, secondary batteries, etc., can solve the problems of the connection mode of the positive terminal with many lines, the safety needs to be improved, and it is not conducive to mass production. , to achieve the effect of reducing the die-cutting pole piece process of the battery cell, reducing the occupation of the internal space of the battery cell, and increasing the utilization rate of the module space.

Pending Publication Date: 2021-03-19
XIAMEN HAICHEN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the positive ear connection method has many lines, and the safety needs to be improved; the composition is complicated, the production is difficult, and it is not conducive to large-scale production

Method used

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  • Lithium ion battery structure and tab electric connection method
  • Lithium ion battery structure and tab electric connection method
  • Lithium ion battery structure and tab electric connection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a lithium-ion battery structure;

[0033] like Figure 1-Figure 8 As shown, the lithium-ion battery structure in this embodiment includes a casing 1, a battery cell 2 and a top cover 3, and there are several battery cells 2 arranged side by side inside the casing 1, and the top cover 3 is welded to On the top of the housing 1, the battery cell 2 is provided with positive tabs 21 and negative tabs 22, the positive tabs 21 are full tabs, and the positive tabs 21 and negative tabs 22 are respectively located on the upper and lower sides of the battery cell 2. side, wherein the negative tab 22 is located on the upper side of the cell 2, the positive tab 21 is located on the lower side of the cell 2, the top cover 3 is provided with a negative post 4, and the negative tab 22 is connected to the The negative pole 4 is connected to each other, and the positive tab 21 is connected to the bottom of the casing 1 through the positive connecting piece 6 . ...

Embodiment 2

[0044] This embodiment provides a method for electrically connecting the tabs of the lithium-ion battery structure as described in Example 1. Laser welding the negative tab of the battery cell to one side of the negative electrode connecting piece, and then welding the other side of the negative electrode connecting piece to the Negative pole laser welding; laser welding the positive ear of the cell to one side of the positive connecting piece, and then laser penetration welding the other side of the positive connecting piece to the bottom of the shell. This tab electrical connection method not only securely connects the negative tab of the cell to the negative column of the top cover, and tightly connects the positive tab to the bottom of the case, but also keeps the case intact after welding, preventing liquid leakage, bulging, etc. The ear die-cutting process reduces equipment wear and cost, and increases production efficiency.

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Abstract

The invention discloses a lithium ion battery structure and a tab electric connection method. The lithium ion battery structure comprises a shell, a battery cell and a top cover. The battery cell is arranged in the shell, the top cover is welded to the top of the shell, a positive tab and a negative tab are arranged on the battery cell, the positive tab is a full tab, and the positive tab and thenegative tab are located on the upper side and the lower side of the battery cell respectively. A negative pole is arranged on the top cover, the negative lug is connected with the negative pole through a negative connecting piece, and the positive lug is connected with the bottom of the shell through a positive connecting piece. The positive and negative tabs of the battery cell are arranged on the two sides of the battery cell respectively, so that battery cell short circuit possibly caused by the fact that the positive and negative tabs are located on the same side of the battery cell is avoided. The top cover adopts a mono-pole structure, and the difficulty of top cover design and manufacturing and pole welding can be reduced. The positive tab is connected with the bottom of the shellthrough the positive connecting piece, so that the process of die-cutting a pole piece by a battery cell can be reduced, a positive pole is omitted, and the cost is reduced. The battery structure is also beneficial to increasing the energy density of a battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery structure and a tab electrical connection method. Background technique [0002] Lithium batteries have the advantages of high energy density, high capacity, and small size, and are currently a new type of clean battery that is widely used. The design of square lithium batteries is widely used in base station energy storage and electric vehicle power batteries. At present, the most widely used square lithium batteries are generally designed with a top cover bipolar structure. Specifically, the top cover is designed with positive and negative poles. The upper side of the cell is designed with positive and negative tabs. When assembling, the positive and negative tabs of the battery cell are welded to the positive and negative posts on the top cover, and then the top cover is welded to the battery case. Since the positive and negative tabs of the bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/528H01M50/15H01M50/543H01M50/547H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 杨震翁勇新杨强
Owner XIAMEN HAICHEN NEW ENERGY TECH CO LTD
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