Connection array and battery cover of lithium ion battery and method for connecting connection array with battery cover

Abstract

The invention relates to a connection array and a battery cover of a power lithium ion battery. The connection array has a thin plate shape; welding lugs are symmetrically arranged on the two sides of a rectangular thin plate and are integrally connected with the connection array; positioning grooves are formed on the welding lugs; pole column through holes are symmetrically formed in the connection array along the axial central line; the battery cover comprises a battery cover plate, cathode and anode pole columns, upper and lower seal positioning gaskets, plane terminals and connection guiding sheets; and the connection guiding sheets, the lower seal positioning gaskets, the battery cover plate, the upper seal positioning gasket and the plane terminals are respectively and fixedly connected with one another through the cathode and anode pole columns from bottom to top in turn. A method for connecting the connection array with the battery cover comprises the following steps of: connecting the cathode pole column with the anode pole column through the pole column through holes in the connection array and the pole columns on the battery cover; arranging spring gaskets on the connection array, and tightly screwing by using hexagon nuts; and performing resistance welding on the positioning grooves by using a resistance welding machine, so that the connection array is connected with the plane terminals of the battery cover. The invention has the advantages that: the connection stability of the terminals and the connection array of the battery is ensured; and high-power charge-discharge performance and safety performance of the battery are improved.

Description

technical field [0001] The invention belongs to a manufacturing process of a power lithium battery, and in particular relates to a connection bar and a battery cover of a power lithium battery and a connection method for the connection bar and the battery cover. Background technique [0002] With the gradual development of electric vehicles, the application of lithium-ion batteries is becoming more and more extensive. At present, the power supplies used in electric vehicles and electric tools generally need to have the characteristics of high capacity and high power, and the discharge current of the battery will also reach hundreds of amperes. Higher requirements are placed on the connection of the battery pack. At present, there are mainly two methods for connecting the batteries of the battery pack. One is that the battery pole and the connecting row are fastened by nuts; the second is that the connecting row and the battery terminal are welded by resistance. The first c...

AI Technical Summary

Problems solved by technology

The first connection method will cause the nut to loosen due to vibration, oxidation, etc. after long-term use, which will inevitably lead to serious heating and high temperature at the connection, which will increase the internal resistance of the battery, and even lead to battery failure; Due to the constraints of equipment, process and other factors, the two connection methods cannot increase the size of the connection row, which leads to the requirement that high current discharge cannot be passed.

Images