A battery connection assembly, lithium battery and assembly method

Abstract

The invention provides a connection assembly of electric cores, which includes an end cover that can be fastened to one end of at least one electric core, the end of the electric core covered by the end cover has a positive pole lug and a negative pole lug, and the outer side of the end cap is provided with Two pole pieces, the pole pieces are connected with a bottom piece inside the end cap, and the bottom piece can be welded and fixed with the positive tab or the negative tab. The invention also provides a lithium battery including the connecting component and an assembly method. The advantage of the present invention is that: the bottom piece and the pole piece are connected together, which is convenient to fix with the tab of the battery cell, the pole piece and the bottom piece are directly fixed on the connection assembly, and the whole connection assembly can be directly operated during assembly without frequent Suction the pole piece and connection piece set separately, reduce the downtime of equipment caused by multiple pieces or missing pieces, and improve the utilization rate. When the pole piece is turned over, the tab has been fixed, and there will be no interpolation of the tab.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a battery cell connection assembly, a lithium battery and an assembly method. Background technique [0002] The current traditional lithium battery cell assembly method is as follows: ① Use the "butterfly welding" process to connect two single cells together, that is, use ultrasonic welding to weld the two poles of the same polarity through the connecting sheet and the protective sheet; ② The above-mentioned connecting piece is welded together with the pole corresponding to the same polarity by laser. In order to protect the pole, the stop frame is generally buckled at the welding mark to prevent loosening. For example, a patent application with a publication number of CN105261798A is suitable for The assembly device and assembly method for assembling the square lithium battery pole group; ③ Combine the above two single cells and fix them with binding tape; ④ Insert the...

AI Technical Summary

Problems solved by technology

[0004] 1. The connection piece and the protection piece are all separate thin pieces. During the feeding process, there will be frequent phenomena such as multiple pieces and missing pieces, resulting in a low manufacturing utilization rate.

[0005] 2. During the ultrasonic welding process of the connecting sheet and the protective sheet with the tab, it is very easy to shake, and it is difficult to ensure the positioning accuracy of the two on the tab, resulting in poor quality of ultrasonic welding

[0006] 3. The manufacturing process of buckling the stopper is relatively complicated, involving many processes such as stopper buffering, feeding, buckling, buckle height detection, etc., and the quality of the buckle is difficult to effectively guarantee

[0007] 4. When the battery cells are combined, the tabs are prone to be inserted into the battery core body to cause a short circuit of the battery, and when the connecting piece is bent, it is easy to cause damage to the battery tabs, which reduces the manufacturing pass rate

[0008] 5. The scope of application of this method is narrow, and it can only be used for lithium battery assembly when the number of cells is even

And when the number of batteries > 4, the tab interpolation phenomenon of this method is more serious and difficult to effectively solve

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