Lithium ion power battery

Abstract

The invention provides a lithium ion power battery, which can improve the tab location accuracy while winding an electrode plate, improve the production efficiency and the yield and further improve the cell security. The lithium ion power battery comprises a case with a cylindrical surface, a cell in the inner cavity of the case, an upper cover plate and a lower cover plate on both ends of the cell, and an upper electrode part and a lower electrode part on both ends of the cell. The cell includes an electrode plate assembly formed by arranging and connecting a plurality of positive electrode plates, negative electrode plates and an isolating membrane between adjacent positive electrode plate and negative electrode plate in a winding manner; the cell also includes one or more aluminum rings with a cylindrical structure, wherein the aluminum rings are arranged in the inner cavity of the case to divide the electrode plate assembly into a plurality of sections; and a portion of the electrode plate assembly is located inside the aluminum ring, and the other portion of the electrode plate assembly is sheathed outside the aluminum ring. An aluminum plate for dissipating heat is arranged on both ends of the cell, and is connected with the end part of the aluminum ring.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion power batteries, and in particular relates to an internal structure of a lithium-ion power battery. Background technique [0002] In the existing lithium-ion power battery manufacturing process, the battery core is usually wound in a one-time manner. The lithium-ion power battery with the existing structure has the following disadvantages: during the winding process of the pole piece, the alignment accuracy of the tabs of the pole piece is not high, which reduces the production efficiency and qualification rate; at the same time, the battery only has surface heat dissipation but not internal heat dissipation , which poses a certain safety hazard to the battery; it takes a long time for the electrolyte to soak the pole pieces of each layer, which reduces the production efficiency; The battery core may expand and the pole pieces may break, which also poses certain safety hazards. Contents of ...

AI Technical Summary

Problems solved by technology

The lithium-ion power battery with the existing structure has the following disadvantages: during the winding process of the pole piece, the alignment accuracy of the tabs of the pole piece is not high, which reduces the production efficiency and qualification rate; at the same time, the battery only has surface heat dissipation but not internal heat dissipation , which poses a certain safety hazard to the battery; it takes a long time for the electrolyte to soak the pole pieces of each layer, which reduces the production efficiency; The battery core may expand and the pole piece may break, which also poses a certain safety hazard

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