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Method for connecting pole lug of lithium ion battery with pole post and battery

A lithium-ion battery and connection method technology, which is applied to the connection method of lithium-ion battery tabs and poles and the field of batteries, can solve problems such as low efficiency, damaged batteries, complex structures, etc., and achieve reliable connection quality and high efficiency , the effect of improving production efficiency

Active Publication Date: 2011-05-11
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 1 and figure 2 As shown, in the prior art, the tab 22 provided on the battery pole group 21 and the pole post 23 on the cover assembly are connected by bolts 25 and nuts 24 and then placed in the cylinder 11, and because the tab 22 is connected during the connection operation The connecting body with the pole 23 is very easy to contact with the barrel 11, causing a short circuit and damaging the battery. In this way, it is necessary to add insulating parts at the connecting part to prevent short circuit. Fastening bolts, insulating parts, etc., the production efficiency is not high

Method used

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  • Method for connecting pole lug of lithium ion battery with pole post and battery
  • Method for connecting pole lug of lithium ion battery with pole post and battery
  • Method for connecting pole lug of lithium ion battery with pole post and battery

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Experimental program
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Embodiment approach 1

[0017] Such as image 3 The lithium-ion battery shown includes a casing 11, a pole group 21, and a plurality of copper foil tabs 22 drawn from the pole group. The interior of the casing 11 is a cavity, and the pole group 21 is arranged in the cavity; The upper end is open, and the open end is provided with a cover plate assembly. The cover plate assembly includes a sealing plate 26 for sealing the cavity opening and a pole 23 for connecting the tab 22.

[0018] The plurality of tabs 22 drawn from the pole group 21 are welded to the welding surface of the pole 23 by an ultrasonic welding machine. During welding, the first and innermost lugs are first welded to the welding surface of the pole 23, and then the outer lugs are sequentially stacked and welded on the sub-inner lugs. The converter frequency of the welding machine is 20KHZ, the amplitude modulator: 1 / 1.5, the welding head: 1.6 / 0.7, the anvil: 1.0 / 0.45, the welding parameters: the welding time is 0.1 to 0.9 seconds, the we...

Embodiment approach 2

[0020] Such as Figure 4 The lithium ion battery shown is different from the first embodiment in that: the battery pole 23 is provided with two tab welding surfaces, so that multiple tabs can be divided into two groups, which are stacked and welded to the poles. The two opposite welding surfaces of the column 23 can solve the welding problem of more layers of tabs.

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PUM

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Abstract

The invention discloses a method for connecting pole lugs of a lithium ion battery with a pole post and a battery. In the method, a plurality of laminated pole lugs are connected and fixed with the pole post in an ultrasonic welding mode, wherein the pole lug in an innermost layer is fixed with the pole post by welding, and then a plurality of other pole lugs are laminated and welded in turn; the ultrasonic welding lasts for 0.6 second; welding pressure is 5.3*105 Pa; and the amplitude is 85 mu m. Due to the adoption of ultrasonic welding connection, internal parts of the battery are reduced, cost is lowered, production efficiency is improved, a plurality of layers of pole lugs are welded and reliable connection between the pole lugs and the pole post is ensured.

Description

Technical field [0001] The invention relates to the manufacturing field of lithium ion batteries, in particular to a method for connecting a pole lug and a pole of a lithium ion battery and a battery thereof. Background technique [0002] Lithium-ion battery is a secondary battery with high energy density and good environmental performance. It is a brand-new green energy and has broad application prospects. The square lithium-ion battery includes a cylinder, a positive electrode group, a negative electrode group, a diaphragm and an electrolyte, and a cover assembly that seals the cylinder. The electrical conduction between the battery core and the outside is through the tab and cover assembly on the electrode group The electrical connection of the upper pole is realized. Such as figure 1 with figure 2 As shown, in the prior art, the tab 22 provided on the battery pole assembly 21 and the pole 23 on the cover assembly are connected by bolts 25 and nuts 24 and then placed in the ...

Claims

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Application Information

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IPC IPC(8): H01M2/26H01M10/0585H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 方万里吴抗廖复杰
Owner ZHENGZHOU BAK BATTERY CO LTD