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Cylindrical lithium ion cell cap and assembly method

A technology of lithium-ion batteries and caps, which is applied to secondary batteries, battery pack components, circuits, etc., can solve problems such as cap failure and solder joint breakage, and achieve the effects of improving efficiency, reducing equipment investment, and improving process flow

Inactive Publication Date: 2008-12-31
上海德朗能动力电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a cap and assembly method for a cylindrical lithium-ion battery, which mainly solves the technical problem that if the vibration of ultrasonic welding is used in the existing structure, the solder joints will break and the cap will fail. At the same time, ultrasonic welding and battery core assembly can be used , can improve the process flow, improve production efficiency and reduce equipment investment

Method used

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  • Cylindrical lithium ion cell cap and assembly method
  • Cylindrical lithium ion cell cap and assembly method
  • Cylindrical lithium ion cell cap and assembly method

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Embodiment

[0030] Embodiment: a cap applied to a cylindrical lithium-ion battery 18650.

[0031] Sealing ring 1, positive external lead-out terminal (top cover) 2, PTC 3 and explosion-proof aluminum cake 4 adopt the general design, and their dimensions and materials do not change. The support plate 5 is punched from an aluminum-magnesium alloy plate with a thickness of 0.5mm, with an outer diameter of 13.8mm, a central through hole with a diameter of 3.5mm, and a ventilating round hole with a diameter of 1.8mm. The conductive shock absorbing plate 6 is punched from an aluminum-magnesium alloy plate with a thickness of 0.2mm, and is used after annealing at 400 degrees Celsius. The central pad 10 has a diameter of 3mm and a protrusion of 1.5mm. The outer diameter of the ventilating square hole 9 is 6.5mm and the width of the rib 11 0.5mm, the assembly method is the same as the general assembly method, that is, the explosion-proof aluminum cake 4 and the conductive shock absorbing plate 6 a...

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Abstract

The invention pertains to the technical field of secondary power source (a rechargeable battery) which can be repeatedly used. The technology is applied to a lithium ion battery, in particular to a column-shaped lithium ion battery cap and an assembly method thereof. The cap includes a positive electrode external leading-out terminal, PTC, an anti-explosion aluminum plate, a supporting plate and a conductive vibration damper plate, which are sealed and arranged from top to down in sequence from a sealing ring. A lug is welded under the conductive vibration damper plate which is provided with a soldering pad welded with the anti-explosion aluminum plate. The soldering pad is connected with other parts of the conductive vibration damper plate by bars. The assembly method includes the following steps of: liquid injection, cap ultrasonic welding and sealing; or cap ultrasonic welding, liquid injection and sealing. The method mainly aims at solving technological problems in the existing structure that the vibration of ultrasonic welding causes the break of a solder joint and the failure of a cap; simultaneously, the ultrasonic welding and battery roll core assembly can be used for improving process flow and manufacturing efficiency and reducing equipment investment.

Description

technical field [0001] The invention belongs to the technical field of reusable secondary power sources (rechargeable batteries), and is applied to lithium-ion batteries, in particular to a cylindrical lithium-ion battery cap and an assembly method. Background technique [0002] High-performance cylindrical lithium-ion secondary batteries have been widely used in mobile office equipment that tends to be miniaturized and lightweight, such as digital cameras, digital video cameras, mobile DVDs, MP3s, and notebook computers. However, when the battery is affected by abnormal factors such as short circuit, high heat, overcharge, etc., high-pressure gas is likely to be generated inside the battery container, which will cause deformation of the battery container (battery case) and danger of explosion. In order to make it safer to use, a battery safety valve needs to be installed in the battery. When the internal pressure of the battery container rises to an abnormal state, this cra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/04H01M2/08H01M2/06H01M2/30H01M2/34H01M2/12H01M2/10H01M2/00H01M10/40H01M50/00H01M50/147H01M50/172H01M50/186H01M50/242H01M50/247H01M50/30H01M50/547H01M50/59
CPCY02E60/10
Inventor 吴江峰高鹏坤陈瑶
Owner 上海德朗能动力电池有限公司
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