Battery pack with tab connection

Abstract

A battery pack includes a plurality of battery cells stacked on each other, and the plurality of battery cells are connected in series. The battery pack further includes a tab connection device, characterized in that the tab connection device includes an insulating connecting plate and a plurality of battery cells. a conductive connecting post; the insulating connecting plate includes a plurality of grooves; the plurality of grooves are disposed on a side of the insulating connecting plate facing away from the plurality of battery cells; the plurality of overlapping battery cells are arranged relative to each other. The positive and negative electrode lugs of two adjacent battery cells that need to be connected pass through the insulating connecting plate and are bent and placed in the same groove, and overlap each other in the groove. The conductive connecting post is inserted into the groove. , firmly connect the overlapping portions of the positive and negative tabs.

Description

Technical field [0001] The present invention relates to a battery pack, and in particular to a battery pack with a tab connection device. Background technique [0002] Lithium battery is a new type of energy storage battery that has the advantages of high energy density and long life, but it also has the disadvantages of high technical difficulty and high risk. A single lithium battery has limited energy storage. For high-power power supplies that require the use of lithium batteries, multiple lithium batteries must be used to form a battery pack to achieve high energy storage and high power requirements. This requires a reasonably designed mechanism to store these lithium batteries. connect them. Since the current of the battery pack is very large, and the battery pack may be vibrated during operation and cause loose connections, it is required that the connection between the battery tabs must be reliable and the contact resistance must be small. [0003] Conventional lit...

AI Technical Summary

Problems solved by technology

[0003] Conventional lithium battery lugs are connected by welding, and bolts or rivets are also used for locking, but there are often the following problems: special welding equipment must be used for welding, mainly ultrasonic welding, and large-capacity battery packs There are many layers of tabs. With the increase of capacity, the number of tabs can reach more than 100 layers. This requires very high power for ultrasonic welding machines. It is difficult to weld firmly for tabs with more than 50 layers, and multi-layer tabs After being ultrasonically welded, it is easy to become brittle and easy to break, causing the battery pack to be scrapped. In addition, it is difficult to lead out wires for voltage measurement by welding. When one of the batteries is damaged, it cannot be disassembled and must be replaced as a whole; it is locked with bolts or rivets. The best way is to punch holes in the multi-layer lugs together, and then lock them together with bolts or rivets. This connection method is very awkward, and it is easy to cause a short circuit between them, and it is also difficult to perform insulation treatment.

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