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Rectangular lithium ion battery ear-pole and its making method, battery

A lithium-ion battery and tab technology, which is applied in the field of square lithium-ion battery tabs and lithium-ion batteries, can solve the problem of increasing the difficulty of welding or riveting between tabs and cover plates, welding or riveting is not firm, positive and negative electrodes Short circuit and other problems, to achieve the effect of reducing internal resistance drift, reducing the possibility of short circuit phenomenon, and good contact

Active Publication Date: 2007-09-12
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current battery manufacturing process, strip-shaped lugs of equal width are welded to the pole piece, and then the winding and flattening of the battery core are performed. When the lug and the cover plate are welded, because the length of the lug is not easy to control, it is easy to contact with the battery case and cause a short circuit. Therefore, our company has developed such a battery, that is, the lug (positive lug or negative lug) On the narrower side of the wound battery core body, the shortcomings of the above-mentioned batteries are overcome, but there are also the following disadvantages: 1) If the tabs are wide, when performing processes such as winding, flattening, and shelling of the battery core , due to the limited bending radius, it is easy to pierce the diaphragm paper located on both sides of the tab, causing the positive and negative electrodes to contact and cause a short circuit; 2) If the tab is narrow, the welding or riveting between the tab and the cover plate is increased Difficulty, it is easy to cause weak welding or riveting, and the tabs are easy to fall off, resulting in open circuit

Method used

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  • Rectangular lithium ion battery ear-pole and its making method, battery
  • Rectangular lithium ion battery ear-pole and its making method, battery
  • Rectangular lithium ion battery ear-pole and its making method, battery

Examples

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Effect test

Embodiment 1

[0015] Embodiment 1. A method for making a tab of a square lithium-ion battery and a tab of a square lithium-ion battery. One end of the tab used to connect to the cover is made wide enough to make it conveniently electrically connected to the cover , Make the other end of the tab used to connect to the positive or negative plate narrow enough to avoid piercing the separator paper and facilitate the entry of the battery into the shell when making the battery. As shown in Figure 1, the tab of a square lithium-ion battery is a bar-shaped tab 1. The strip-shaped tab 1 is composed of a segment 2 and a segment 3. The segment 2 near the upper end of the bar-shaped tab is wider, and the segment 3 near the lower end is wider. Narrower, each segment 2 and segment 3 of equal width are connected as a whole.

Embodiment 2

[0016] Embodiment 2. Manufacture 1,000 square steel-shell lithium-ion battery cell bodies with a model number of 033448S, as shown in Figures 1 and 2, including the cell body 5, the positive pole lug 1, the negative pole lug 6 and the cover plate 4 , the structure of the positive tab 1 is a bar-shaped tab as shown in Figure 1, the upper wider section 2 of the positive tab 1 is welded or riveted with the cover plate 4, and the lower narrow section 3 of the positive tab 1 is connected to the positive sheet Welded and located on the narrower side of the cell body 5 , the negative tab 6 is welded on the negative tab (not labeled) of the cell body 5 . Then obtain the lithium-ion battery according to the conventional production method, set it as group 1, and measure its short-circuit rate.

[0017] 1000 lithium-ion batteries of the same type were manufactured in the same way using tabs of equal width, set as group 2, and the short-circuit rate was measured.

[0018] ...

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Abstract

This invention discloses one rectangle lithium ion battery ear and its process method, wherein, the ear is of bar electrode ear with different width, one is wider nearly and the other is thinner. The process method comprises the following steps: processing one end of electrode ear wide enough connected to cover board to be connected to cover board easily; processing the other end thin enough of ear to avoid pore through isolation film in process. This invention discloses one rectangle lithium ion battery comprising electrode slices, bar electrode ear and cover board with one end wider and the other end thinner.

Description

【Technical field】 [0001] The invention relates to a square lithium ion battery tab and the lithium ion battery. 【Background technique】 [0002] Lithium-ion secondary batteries have outstanding characteristics such as high working voltage, large specific energy, small self-discharge, wide application temperature range, stable working voltage, and long storage life. Products, electric vehicles, and aerospace applications have shown great interest and enthusiasm, and have continued to explore and improve the performance and manufacturing process of lithium-ion secondary batteries. [0003] In the current battery manufacturing process, strip-shaped lugs of equal width are welded to the pole piece, and then the winding and flattening of the battery core are performed. When the lug and the cover plate are welded, because the length of the lug is not easy to control, it is easy to contact with the battery case and cause a short circuit. Therefore, our company has developed such a ...

Claims

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Application Information

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IPC IPC(8): H01M2/30H01M10/40H01M2/26H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 黄加军邵戈高学宝邓燕邓华利王申
Owner ZHENGZHOU BAK BATTERY CO LTD
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