Battery pole and battery cover plate assembly

Abstract

The invention belongs to the technical field of batteries, and discloses a battery pole and a battery cover plate assembly.The battery pole comprises a substrate and a connecting column, the substrate is made of an aluminum plate, and the substrate is arranged outside a battery and used for being connected with an external circuit of the battery; the connecting column is made of a copper plate, one end of the connecting column is fixedly connected with the substrate, and the other end of the connecting column is used for being connected with an internal battery cell of the battery. According to the utility model, the structure has better overcurrent capability, lower structure failure risk and higher safety, and the space of the battery pack can be saved at the same time.

Description

technical field [0001] The present invention relates to the technical field of batteries, and in particular, to a battery pole and a battery cover plate assembly. Background technique [0002] The battery pole is an important part in the battery that connects the inside and outside of the battery. One end of the battery pole is connected to the external circuit of the battery, and the other end is connected to the internal cell of the battery, so that the battery can realize the function of charging and discharging. [0003] Currently, if figure 1 As shown, the battery poles are mostly composite poles, that is, they have a copper base plate 1 and an aluminum connection pole 3 . In the process of making the battery pole, first, the aluminum material and the copper material are cut into small pieces of aluminum plates and small pieces of copper plates, and the cut aluminum plates and copper plates are combined by friction welding to become copper-aluminum composite parts , e...

AI Technical Summary

Problems solved by technology

In the process of making battery poles, firstly, the aluminum and copper materials are cut into small pieces of aluminum plates and small pieces of copper plates, and the cut aluminum plates and copper plates are combined by friction welding to form copper-aluminum composite parts , each battery pole needs to be welded separately, and then the copper-aluminum composite is processed into the required shape of the battery pole. When friction welding is used, only one battery pole can be processed in one clamping, and the processing efficiency is low.

In terms of structural reliability, the copper / aluminum joint surface is affected by the rebound force of the sealing ring, and is always under stress, with the risk of fracture and failure

[0004] In the prior art, when the battery pole is in use, the connecting post is outside the battery and connected to the external circuit of the battery, and the substrate is inside the battery and connected to the cell in the battery. When using the battery, the connecting post needs to be connected to the external circuit of the battery. Welding connection, but the end face of the connecting post needs to avoid the riveting area of ​​the terminal / connecting post during welding, which reduces the utilization rate of the end face area, makes the terminal volume too large, and takes up too much battery pack space; at the same time, when copper and aluminum When the bonding surface is inside the cell (the sealing ring is used as the internal / external boundary of the cell), due to electrochemical restrictions, no aluminum should remain on the copper plate, resulting in the maximum area of ​​the copper / aluminum bonding surface being the diameter of the connecting column Size, and the flow capacity of aluminum is much smaller than that of copper, resulting in weak overall flow capacity

With the development of society and the advancement of battery technology, people have higher and higher requirements for the charge-discharge rate of the battery. When the over-current capability is weak, the battery pole will generate a lot of heat and conduct it to the entire battery, thus seriously The electrical performance and safety performance of the battery will be affected, and even the thermal runaway of the battery will occur. Therefore, in order to match the requirements for a higher charge and discharge rate of the battery, it is necessary to increase the cross-sectional area of ​​the battery pole, but the volume and cost of the battery pack also increase. increase

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