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Lithium battery current collecting body, high capacity cylindrical lithium ionic cell and preparation

A lithium-ion battery and current collector technology, applied in the field of high-capacity cylindrical lithium-ion batteries, can solve the problems of difficult automation, difficult process control, hidden dangers of battery cell safety, etc., to facilitate high-efficiency production, avoid explosive reactions, The effect of reducing security risks

Inactive Publication Date: 2009-02-11
SHENZHEN BAK BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The laminated battery is generally of square structure, and each pole piece has tab leads, which can share high current, so it can meet the requirements of high current discharge. It is mainly used in high-capacity and high-power lithium-ion secondary batteries. The final pole piece must first be cut into several small square pieces. The cross-cut edge of each small piece is prone to defects such as burrs, dust, and local dropouts. Process control is very difficult, and these are the main causes of internal short circuits in the battery cell. It also leaves potential safety hazards for the future use of batteries; another disadvantage of using the laminated process is that the production efficiency is very low and it is not easy to realize automation

Method used

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  • Lithium battery current collecting body, high capacity cylindrical lithium ionic cell and preparation
  • Lithium battery current collecting body, high capacity cylindrical lithium ionic cell and preparation
  • Lithium battery current collecting body, high capacity cylindrical lithium ionic cell and preparation

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Embodiment 1

[0045] Cell size: shell diameter 50mm, total height 420mm, pole group height 363mm, nominal capacity: 50Ah.

[0046] The positive active material is LiFe coated with 5% carbon 0.99 Nb 0.01 PO 4 , 4 parts of PVDF (grade: Solvay 7200) are used as the adhesive, and 3 parts of carbon black are used as the conductive agent.

[0047] The positive electrode current collector is made of aluminum foil with a thickness of 20 microns. The width of the aluminum foil current collector is 354mm. A row of stress dispersion holes are punched on the aluminum foil every 360mm by laser drilling technology. The hole spacing is 0.5mm. The center line of the hole and the edge of the foil form an angle of 45 degrees. When continuously coating the positive electrode slurry, control the strip-shaped empty foil A with a width of 2mm on one side of the aluminum foil, and the strip-shaped empty foil B with a width of 18mm on the other side. B After the positive pole piece is rolled, ultrasonically wel...

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Abstract

The invention discloses a current collector of a lithium ion battery, wherein stress dispersing holes are formed on the current collector. The invention further discloses a high-capacity cylindrical lithium ion battery including the current collector, and the preparation method thereof. The prepared lithium ion battery has the advantages of high capacity and higher safety performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a current collector of the lithium ion battery, a high-capacity cylindrical lithium ion battery and a preparation method of the battery. Background technique [0002] There are two main manufacturing processes for lithium-ion secondary batteries currently on the market: laminated batteries and wound batteries. The square sheet of the ear, and then stack the positive electrode sheet, diaphragm, negative electrode sheet, diaphragm, etc. in sequence, and then connect the lead-out tab and the lead-out electrode together, and package it in the case; the main characteristics of the winding battery manufacturing are: The welding position of the lug is reserved on the positive and negative electrode sheets coated intermittently. After welding the tabs, the positive and negative electrode sheets are separated by a diaphragm and wound together to form an electrode group and then packag...

Claims

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Application Information

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IPC IPC(8): H01M4/64H01M4/80H01M4/66H01M10/40H01M4/02H01M4/58H01M4/48H01M4/13H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 李鑫郑荣鹏黄荣光张建文张拥乱刘方王驰伟刘付勇林文伟刘道坦郭春泰
Owner SHENZHEN BAK BATTERY CO LTD
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