Method for unilateral welding of cylindrical battery cells

Abstract

The invention provides a method for unilateral welding of cylindrical battery cells. A plurality of battery cells, busbars, an upper bracket, a lower bracket, an aluminum wire, a battery cell positiveelectrode, a battery cell negative electrode and a battery cell edge are included. The method comprises the steps that the plurality of battery cells are tidily arranged between the upper bracket andthe lower bracket to form a battery module; the battery cell positive electrodes are fixedly connected with the upper bracket; and the battery cell negative electrodes are fixedly connected with thelower bracket. The busbars are fixed on the upper bracket, and the positive electrodes of the battery cells are connected with the busbar through aluminum wires in a welding manner. According to the invention, due to the arrangement of the battery cells , the busbars are only assembled on one surface of each positive electrode, and the busbars are respectively welded with the positive electrodes of the battery cells and the edges of the battery cells through the aluminum wires; the battery cells are connected in series and in parallel; the use of materials such as the busbars and the aluminumwires can be reduced; the welding workload can be reduced; and the heat dissipation effect of the battery pack can be further improved.

Description

technical field [0001] The invention relates to a welding method for a new energy power battery system, in particular to a method for unilaterally welding a cylindrical battery cell. Background technique [0002] With the continuous development of the PACK process, the connection method has been continuously improved, from the traditional wire soldering process, nickel sheet soldering process, nickel sheet spot welding process, to laser welding process and ultrasonic aluminum wire welding process. The traditional soldering process is time-consuming, prone to failure, and it is difficult to test whether there are problems with the connections and conductors between batteries. In contrast, laser welding and ultrasonic welding have multiple "rolling" advantages: first, the use of aluminum wire can achieve repeated welding, which greatly improves the maintainability and recovery rate; second, the aluminum wire can adapt to the stress of the car on the joint Requirements and pul...

AI Technical Summary

Problems solved by technology

However, the current arrangement of battery modules is that the positive and negative poles are staggered, that is, some positive poles face up and some negative poles face up, and then the upper and lower parts of the battery pack are assembled with bus bars, and the aluminum wire ultrasonic welding process is used for series-parallel connection. The arrangement requires bus bars to be assembled on the upper and lower sides of the battery pack, and both sides must be welded, which not only increases the use of materials such as bus bars and aluminum wires, but also consumes welding workload and affects the heat dissipation of the battery pack.

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