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Safety assembly of low-internal-resistance tab-free cylindrical lithium battery

A safety component and cylindrical technology, applied in the field of safety components of a cylindrical lithium battery without poles, can solve problems such as large internal resistance, achieve the effects of less structure, overcome processing safety problems, and reduce welding process

Pending Publication Date: 2022-06-07
安徽镭腾能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims to solve the above problems, and provides a safety component of a non-tab cylindrical lithium battery with low internal resistance, which well solves the welding and safety problems of large-scale cylindrical batteries, and solves the above-mentioned problem of large internal resistance. technical problem

Method used

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  • Safety assembly of low-internal-resistance tab-free cylindrical lithium battery
  • Safety assembly of low-internal-resistance tab-free cylindrical lithium battery
  • Safety assembly of low-internal-resistance tab-free cylindrical lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0042] In this embodiment, a safety assembly for a low-internal-resistance electrodeless cylindrical lithium battery includes a steel case 1 for storing the battery cell assembly 01 , a steel case 1 with a welded positive electrode tab 012 at the bottom of the steel case 1 . The positive electrode current collector disc 2, the negative electrode current collector disc 3 located at the upper end of the steel shell 1 for welding the negative electrode tabs 011 leading to the vicinity of the top of the steel shell, and the explosion-proof disc 4 located on the negative electrode current collector disc 3 for explosion protection ; Negative collector plate 3 central region is provided with a liquid injection hole 31 for injecting electrolyte, negative collector plate 3 and positive collector plate 2 have welding portion 32 and hole portion 33, welding portion 32 is used for welding tabs. In the safety component, since the positive and negative current collecting discs are provided a...

Embodiment 2

[0051] The difference from the embodiment is that the edge of the negative electrode current collecting disk 3 is designed as an upwardly raised edge 33. Since the raised edge 33 has a certain tension to the steel case 1, it is easy to weld the steel case 1 and the negative electrode current collecting disk 3 together. . More specifically, a plurality of notches 34 are designed on the raised edge 33 to prevent the tension from being large during pre-installation, which will cause deformation of the negative electrode current collector plate 3 and the steel case 1, and at the same time reduce the influence of surface tension on the steel case 1, which can make welding. It is easy to form a flat surface for welding uniformity. In addition, a plurality of arched portions 35 are arranged in the middle of the negative electrode current collecting plate 3 , and the arched portions 35 are used for welding the explosion-proof disc 4 . A plurality of fan-shaped regions 36 in the shape...

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Abstract

The invention discloses a safety assembly of a low-internal-resistance tab-free cylindrical lithium battery and a preparation method thereof. Comprising a steel shell used for storing a battery cell assembly, and the bottom of the steel shell is provided with a positive electrode current collecting disc welded with a negative electrode lead, a negative electrode current collecting disc located at the upper end of the steel shell and used for welding a negative electrode lead led to the position near the top of the steel shell, and an anti-explosion piece located on the negative electrode current collecting disc and used for preventing explosion; and a middle hole for injecting electrolyte is formed in the middle area of the negative collector plate. The tabs which are kneaded flat are welded on the positive collector plate and the negative collector plate and are sealed by the anti-explosion sheet, so that the distance of communicated leads is reduced by the positive electrode and the negative electrode, and the internal resistance is overcome; and meanwhile, compared with the conventional lithium battery structure, the lithium battery has fewer safety assembly structures, the welding process of the safety assembly is reduced, and the assembly process can realize automatic industrial production.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a safety component of a low-internal-resistance electrodeless-tab cylindrical lithium battery. Background technique [0002] According to the packaging form, currently our lithium batteries are mainly divided into three forms: square type, soft pack and cylindrical type. [0003] Cylindrical lithium batteries can be divided into different types such as lithium iron phosphate, lithium cobalt oxide, lithium manganate, cobalt-manganese mixed, and ternary materials according to different anode materials. At present, the cylinders are mainly steel-shell cylindrical lithium iron phosphate batteries, which are characterized by high capacity, high output voltage, good charge-discharge cycle performance, stable output voltage, high-current discharge, stable electrochemical performance, and use Safe, wide operating temperature range and environmentally friendly. Widely used in solar lamp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/052H01M50/533H01M50/536H01M50/342
CPCH01M10/0587H01M10/052H01M50/533H01M50/536H01M50/3425Y02P70/50
Inventor 刘勇黄磊李小平
Owner 安徽镭腾能源科技有限公司