Lug bolted lithium ion battery

Abstract

The invention discloses a lug bolted lithium ion battery which comprises electrical cores and an outer housing; the electrical cores are arranged in an aluminum housing or a plastic outer housing; at least two electrical cores are stacked together, and a diaphragm is arranged between the two electrical cores; a bolting hole is arranged on a lug of each electrical core; a positive lug and a negative lug are respectively connected by a bolt and a nut, and a gasket penetrates through the bolt between the lugs; and a bus-bar electrode also penetrates through the gasket on the bolt between the lugs. The battery provided by the invention has the advantages that the electrical cores are simple to assemble, and problems of unstable welding and connecting way between the electrical cores and electrode of the existing high-capacity laminated lithium ion battery and complex technology are overcome, the problem of stress centralization of the lugs in the external layer caused by the excessive deflection of the lugs to one side when the lugs of the high-capacity laminated lithium ion battery are connected is solved, the production efficiency can be improved obviously through the connection way of the bolt, and the service life of the electrical cores is improved.

Description

technical field [0001] The invention relates to a lithium ion battery, more specifically to a tab-bolted lithium ion battery. Background technique [0002] At present, the tabs of stacked lithium-ion batteries are usually connected by ultrasonic welding or riveting. The tabs of larger-capacity stacked lithium-ion batteries often have more layers, riveting and ultrasonic welding. With the increase of capacity, stacking The number of layers is more than 100 layers, which requires a very high power of the ultrasonic welding machine. It is difficult to weld the copper foil with more than 50 layers firmly, and it is easy to cause excessive contact internal resistance, and there is a risk of false welding, which will affect the performance of the battery; Due to the excessive number of pole pieces in the single-core structure, the stress on the tabs of the inner and outer pole pieces is uneven, and there is a risk that the tabs of the outer pole pieces are easy to break, the quali...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the problem of unstable connection between the cell and the electrode of the existing large-capacity laminated lithium-ion battery and the complicated process, and to provide a tab-bolted lithium-ion battery. The connection method can effectively solve the disadvantages of weak welding and riveting and large contact internal resistance, and improve production efficiency and product quality

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