Cylindrical battery and manufacturing method thereof

Abstract

The present invention provides an electrode plate, a laminated electrode group, and a battery. By making current collecting terminals common to two active material holding parts that hold active materials, variations in current collection efficiency can be prevented, and the number of current collecting terminals can be reduced. , simplifies the welding operation, and simplifies the operation of stacking a plurality of electrode plates. Specifically, the present invention is a laminated electrode group (3) provided with a positive electrode plate (31), a negative electrode plate (32) and a separator (33). The parts (31B) are substantially U-shaped and arranged opposite to each other, and the negative electrode plate (32) is substantially U-shaped in which two active material holding parts (32B) that hold the negative electrode active material are arranged opposite to each other, and the positive electrode plate (31) The positive electrode plate (31) and the negative electrode plate (32) are laminated in such a way that at least one active material holding portion (31B) on the negative electrode plate (32) is sandwiched between two active material holding portions (32B) on the negative electrode plate (32).

Description

technical field [0001] The invention relates to a cylindrical battery and a manufacturing method thereof. Background technique [0002] As a conventional cylindrical battery, as shown in Patent Document 1, there is a technique of accommodating a cylindrical electrode group in a cylindrical battery case, and the cylindrical electrode group is sandwiched by a belt-shaped separator. It is formed by winding a strip-shaped positive electrode plate and negative electrode plate in a spiral shape. [0003] However, in the technique of spirally winding the strip-shaped positive electrode plate, negative electrode plate, and separator, winding displacement of the positive electrode plate and the negative electrode plate occurs during the winding process. Therefore, a desired battery capacity cannot be obtained in a cylindrical battery, and problems such as causing an internal short circuit arise. [0004] prior art literature [0005] patent documents [0006] Patent Document 1: J...

AI Technical Summary

Problems solved by technology

[0008] However, when a stacked electrode group is housed in a battery case, the current collector terminals of the plurality of positive electrode plates are connected to a common current collector plate, and the current collector plate is welded to the cover of the battery case, Alternatively, the collector terminals of each positive plate are welded to the cover, so that on each positive plate, the current collection efficiency deviates

In addition, the work of welding the current collector terminal of each positive electrode plate to the current collector or the battery case becomes complicated.

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