Lithium ion battery case with prefabricated burrs on bottom and lithium ion battery preparation method

A lithium-ion battery and shell technology, which is used in the manufacture of electrolyte batteries, battery pack components, non-aqueous electrolyte batteries, etc., to achieve the effects of reducing internal resistance, improving welding strength, and improving comprehensive electrical performance

Inactive Publication Date: 2013-06-12
浙江铁鹰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

Although this technical solution reduces the virtual welding rate from the perspective of the fixture, when multiple tabs are welded to the cap, it is still relatively easy to cause virtual welding, and it is necessary to further overcome the phenomenon of virtual welding

Method used

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  • Lithium ion battery case with prefabricated burrs on bottom and lithium ion battery preparation method
  • Lithium ion battery case with prefabricated burrs on bottom and lithium ion battery preparation method
  • Lithium ion battery case with prefabricated burrs on bottom and lithium ion battery preparation method

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Experimental program
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Effect test

preparation example Construction

[0027] likefigure 1 , figure 2 Shown, a kind of preparation method of lithium ion battery comprises the following steps:

[0028] 1) Preparation of the lithium-ion battery case with prefabricated burrs at the bottom: During the deep-drawing process of the lithium-ion battery case, a concave hole of a certain shape is pre-processed on the top of the punch of the forming die, and after deep-drawing, the lithium-ion battery can be formed. Protruding burrs 2 of a certain shape are processed inside the boss 11 at the bottom of the shell 1 to obtain a lithium-ion battery shell 1 with prefabricated burrs 2 at the bottom;

[0029] 2) Weld the lithium-ion battery case 1 with the prefabricated burr 2 on the bottom with the tab 3 on the battery cell, and the welding head 4 is close to the burr 2 at the bottom of the lithium-ion battery case 1, so that the tab 3 is in contact with the bottom burr 2 During the welding process, a large current is discharged through the burr 2, which can e...

Embodiment 1

[0032] like figure 1 As shown, the lithium-ion battery casing with prefabricated burrs at the bottom (that is, the 18650 steel casing for lithium-ion power batteries with prefabricated burrs), including the lithium-ion battery casing 1, the specific dimensions of the lithium-ion battery casing 1 are shown in Table 1, where the unit In mm, the outer diameter and inner diameter are diameters.

[0033] Table 1

[0034] model

Outer diameter ±0.05

Inner diameter ±0.05

Height ±0.1

Shell wall thickness ±0.02

Boss diameter

18650

18

17.52

66.9

0.24

13.5

[0035] Burrs 2 are provided on the inside of the bottom of the lithium-ion battery case 1 (that is, the side used to connect with the tab on the battery cell). The bottom of the lithium-ion battery case 1 faces outwards (that is, the direction along the bottom of the lithium-ion battery case 1 away from the burrs) forms a boss 11 , and the burrs 2 are arranged on the in...

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Abstract

The invention discloses a lithium ion battery case with prefabricated burrs on the bottom. The lithium ion battery case comprises a lithium ion battery case; and burrs are formed on one side of the bottom of the lithium ion battery case for being connected with tabs. By arranging the burrs on the bottom of the lithium ion battery case, cold solder occurring in the welding process of a multi-tab point bottom can be obviated effectively, and the welding strength between the lithium ion battery case and the multi-tab point bottom can be enhanced, thereby effectively reducing internal resistance and improving point bottom reliability of the lithium ion battery. The invention also discloses a lithium ion battery preparation method, which comprises the steps of prefabricating concave holes at the top end of a punch of a forming mold, molding by deep punching to obtain the lithium ion battery case with the prefabricated burrs, welding the lithium ion battery case with the tab point bottom, and carrying out subsequent treatment to obtain a lithium ion battery. The yield of the lithium ion battery can be improved greatly.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries and their preparation, in particular to a lithium-ion battery case with prefabricated burrs on the bottom and a preparation method for the lithium-ion battery. Background technique [0002] Rechargeable lithium-ion secondary battery has the characteristics of high specific energy, long cycle life, no memory effect, and has the advantages of safety, reliability and fast charge and discharge, so it has become a hot spot in the research of new power supply technology in recent years. Since lithium-ion batteries are green, environmentally friendly and non-polluting secondary batteries, they meet the major development needs of energy and environmental protection in various countries today, and their usage in all walks of life is increasing rapidly. In recent years, global resources and environmental protection issues have led to a rapid increase in the application of lithium-ion batteries to replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M10/058
CPCY02E60/10Y02P70/50
Inventor 黄辉吕焕祥张立军毛秦钟甘永平陶新永范明峰
Owner 浙江铁鹰新能源科技有限公司
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