Soft pack lithium battery tab connection device

Abstract

The invention relates to a lug connecting device of a soft-packed lithium battery, comprising: a tightening block, a lug connecting piece and an integrated board; stopper; the tab connecting piece is placed in the slot; the tightening block is installed on the integrated board, and a flexible contact finger is arranged on the tightening block, and the flexible contact finger has a contact point, and the contact is in contact with the tab connecting piece; Under pressure, the contacts of the flexible contact fingers are deformed and come into close contact with the lug connecting piece, clamping the tabs of the stacked batteries passing through the slot between the stopper and the lug connecting piece. The tab connection device of the present invention is convenient for disassembly and assembly between batteries, has simple structure, reliable connection and small internal resistance, and can be generally used for the connection of tabs of various series-parallel batteries.

Description

technical field [0001] The invention relates to a battery lug connection device, in particular to a soft pack lithium battery lug connection device which does not need welding, and saves fasteners compared with bolt connection, has a simple structure and reliable connection. Background technique [0002] In the soft pack lithium battery box used in new energy vehicles, the series and parallel connections of the batteries are connected by laser welding, ultrasonic welding, etc. after the battery tabs are superimposed on each other. Although welding has the advantages of reliable connection, stable structure, and high degree of automation, there are many problems in the connection of battery tabs, for example: 1) laser welding and ultrasonic welding are irreversible connections, and cannot be disassembled after welding. When it is found that one of the lithium batteries has performance differences or cannot be used normally, the problematic lithium battery cannot be replaced, ...

AI Technical Summary

Problems solved by technology

Although welding has the advantages of reliable connection, stable structure, and high degree of automation, there are many problems in the connection of battery tabs, for example: 1) laser welding and ultrasonic welding are irreversible connections, and cannot be disassembled after welding. When it is found that one of the lithium batteries has performance differences or cannot be used normally, the problematic lithium battery cannot be replaced, and it can only be allowed to affect the normal use of other lithium batteries in the battery pack, or cause the entire battery pack to be scrapped. Undoubtedly, it will cause a waste of resources and increase the cost of use; 2) When the battery pack is over-current, it can only be disconnected through the relay of the whole box, and the single battery in the box cannot be disconnected accurately, resulting in the possibility that even if the whole box is disconnected After opening, the faulty single battery in the box may still be in a short-circuit state; 3) The thickness of the soft-pack lithium battery is small, and the distance between the tabs is also very small, which is difficult to meet the needs of laser welding and ultrasonic welding This not only brings inconvenience to the welding operation, but also the battery tabs are easily damaged during welding

Although the use of bolts to connect the tabs of the battery can avoid the problem of inseparability caused by welding, but the number of fasteners is large and the internal resistance is large, which will reduce the energy density of the battery.

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