Lithium ion battery and tab and pole connecting pieces thereof

Abstract

The invention relates to a lithium ion battery and tab and pole connecting pieces thereof. The lithium ion battery comprises tabs drawn out from battery cells, wherein a connecting piece is connected with each tab and a corresponding pole of the battery; each connecting piece comprises a tab connecting part which is in conductive connection with the corresponding tab; each tab consists of at least two tab bodies which are separated from each other along the thickness direction of the tab and are arranged at intervals; each tab body is connected with a corresponding battery cell; and the tab connecting part of each connecting piece is provided with connecting bodies which are arranged in parallel and are attached and connected to each tab body in a matching mode one by one. Each tab is provided with the at least two tab bodies which are separated from each other along the thickness direction of the tab and are arranged at intervals, and the connecting pieces of the tabs and the poles are provided with the multiple branch connecting bodies, so that the connecting thickness of the tabs and the connecting pieces can be greatly reduced. Therefore, the tabs and the poles are easier to be connected with one another, and in particular an outstanding thickness reduction effect can be achieved for an ultrasonic welding process.

Description

technical field [0001] The invention relates to a lithium ion battery and a connecting piece between a tab and a pole. Background technique [0002] Lithium-ion batteries have excellent performance and are widely used. One of the laminated lithium-ion power batteries has more lugs and small internal resistance, which avoids the material falling of the pole pieces due to bending, and the battery has a large capacity and a small size, and can withstand -55°C~+ It has a temperature range of 150°C and is also very resistant to pressure, temperature and shock, providing excellent performance. However, the large-capacity laminated power battery has more pole pieces and thicker lugs. The connection between the lugs and the poles is a difficult point in the production process. At present, the connecting band and the lugs are directly connected by bolts, riveting or ultrasonic welding. accomplish. [0003] The poles required for bolt connection are heavy, the material cost and pro...

AI Technical Summary

Problems solved by technology

However, no matter what kind of fixing method is used for the connector with this structure, when the number of pole pieces is large and the thickness is thick, the connection reliability will be reduced, the internal resistance consistency during welding will be poor, welding is difficult, and it will occupy the interior of the battery. The space is large, the volume of the battery is low compared to the capacity, and when the battery case is welded by vibration and friction, it is easy to cause the tabs to tear

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