Copper-aluminum composite pole, cathode cover plate assembly structure and energy storage unit

Abstract

The invention discloses a copper-aluminum composite pole, a cathode cover plate assembly structure and an energy storage unit. The upper part of the pole is an aluminum material part, the lower part of the pole is a copper material part, the connecting part of the aluminum material part and the copper material part is a fused transition part, and the aluminum material part and the transition part are not in contact with electrolyte after being assembled. The pole of the cathode cover plate assembly adopts the copper-aluminum transition piece, the aluminum part at the upper part of the pole adopts the aluminum material, the welding performance is good, the aluminum sheet can be more favorably used for welding with the single bodies of the module, the copper part at the lower part of the pole adopts the copper material, the copper material is in contact with the electrolyte in the energy storage element for electric conduction, the electric conduction performance is good, and electrochemical corrosion is avoided.

Description

technical field [0001] The invention relates to the technical field of electric energy storage, in particular to a negative electrode cover plate assembly structure and an energy storage element. Background technique [0002] In order to avoid electrochemical reaction with the internal electrolyte, the negative column part of energy storage elements such as batteries and supercapacitors usually adopts all-copper parts. The welding performance between the negative pole of the copper piece and the external aluminum connection piece is poor, and the copper-aluminum connection will cause electrical corrosion under the condition of electrification. The negative electrode part in contact with the electrolyte cannot be aluminum, it must be copper, and the copper-aluminum transition material can just solve this problem. [0003] At present, the insulating member between the negative pole and the first cover plate of the negative electrode cover plate assembly of the energy storage ...

AI Technical Summary

Problems solved by technology

[0003] At present, the insulating part between the negative electrode column and the first cover plate of the negative electrode cover plate assembly of the energy storage element is usually made by riveting the insulating part, and there is no circumferential limit between the insulating part and the first cover plate. There may be circumferential rotation in the middle, which will affect product quality

The barrel is usually a straight-through bobbin structure with two ports fully open and through. At the positive end, a circular cover plate matching the contour of the positive port is used to cover the port as a whole, and the butt edges of the two are welded and fixed. The edge parts of the cylinder are usually slanted butt jointed before welding. During the welding process, it is relatively difficult to control the joint of the two, and it is easy to shift if you do not pay attention to it, which will affect the reliability of the welding; And the dimensional accuracy requirements of the cover plate are high, and the processing technology is difficult

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