Collector plate structure of circular lithium ion battery and welding method

A lithium-ion battery, collector plate technology, applied in welding equipment, non-electric welding equipment, laser welding equipment and other directions, can solve the problems of lack of internal self-protection ability of the battery, poor anti-vibration performance, etc., to increase anti-vibration performance, repeat The effect of good performance and simple welding method

Pending Publication Date: 2022-05-13
TIANJIN LISHEN BATTERY
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The current collector plate structure has poor anti-vibration performance, and it is difficult to meet the requirements of long-term vibration without cracking on the vehicle, and lacks the self-protection ability inside the battery when the current is too large

Method used

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  • Collector plate structure of circular lithium ion battery and welding method
  • Collector plate structure of circular lithium ion battery and welding method
  • Collector plate structure of circular lithium ion battery and welding method

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Embodiment 1

[0031] A structure and a method for cutting tabs of a novel circular lithium-ion battery pole piece, the steps of which are as follows:

[0032] The circular diameter of the negative current collector plate of the designed circular battery is 37mm, the notch width of the positioning groove of the outer ring is 1.34mm, the height is 2.79mm, the diameter of the central hole is 5.11mm, the radius of the sector area is 13mm, and the angle is 90°. There are four sectors in total. Reserve a certain area at the fan-shaped root to cut two vertical lines, and cut some folded lines with rounded corners inside the vertical lines for force buffering (such as figure 1 The top view of the structure of the negative electrode current collecting plate, in the figure: the welding area 11 between the negative electrode flattening layer and the negative electrode current collecting plate, the welding area 12 between the negative electrode current collecting plate and the shell, the central hole 13...

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Abstract

The invention discloses a collector plate structure of a novel circular lithium ion battery and a welding method. According to the collector plate structure, a hole is formed in the middle of a negative collector plate, four fan-shaped cutting lines with the bottoms not closed are evenly arranged on the negative collector plate, two cutting straight lines in the radial direction are symmetrically arranged at the roots of the fan-shaped cutting lines with the bottoms not closed, cutting fold lines are arranged in the cutting straight lines on the negative collector plate, and the corners of the cutting fold lines are fillets; four fan-shaped cutting lines are uniformly arranged on the positive collector plate, two cutting straight lines in the radial direction are symmetrically arranged at the arc center of each fan-shaped cutting line, a cutting fold line is arranged in an area in the two cutting straight lines of the positive collector plate, the corner of the cutting fold line is a fillet, and the positive collector plate and the positive pole are subjected to bottom welding; and the negative collector plate is welded with the shell by laser. The collector plate structure and the welding method are simple and easy, and are suitable for various round all-tab rubbing processes, and the size of the adjustable collector plate is set according to different batteries, so that the overcurrent capability of a battery cell is ensured.

Description

technical field [0001] The invention relates to the field of lithium-ion battery production, and more specifically, to a collector plate structure and welding method of a circular lithium-ion battery. Background technique [0002] Lithium-ion batteries are not only widely used in 3C fields such as mobile phones, digital cameras, and PC computers, but also in the field of electric tools. With the country's strong support for new energy vehicles, since 2011, lithium-ion batteries have been widely used in electric vehicles and electric bicycles. The field has also ushered in opportunities for vigorous development. Among a series of types of lithium-ion batteries, cylindrical aluminum-cased lithium-ion batteries have attracted much attention due to their high energy density and good safety performance. [0003] The cylindrical aluminum shell lithium-ion battery with full tabs is currently the commonly used assembly method. However, the problem faced by the cylindrical aluminum s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/346B23K26/70B23K20/10B23K101/36
CPCB23K26/346B23K26/702B23K20/106B23K2101/36
Inventor 周翠英陈英龙路荣彬于利伟
Owner TIANJIN LISHEN BATTERY
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