Battery negative electrode structure, battery and preparation method

Abstract

The invention discloses a battery negative electrode structure, a battery and a preparation method, and the battery negative electrode structure comprises a cylindrical shell with a battery cell accommodating cavity, an open end and a closed end; the battery cell accommodating cavity can accommodate a battery cell, and the open end is used for placing a cylindrical battery cell in the battery preparation process; the closed end is provided with a first sunken part which is sunken towards the interior of the battery cell accommodating cavity along the axis direction of the cylindrical shell, the first sunken part is of a cylindrical structure, and a first narrow slit is formed by the side wall of the first sunken part and the side wall of the cylindrical shell. According to the battery negative electrode structure provided by the invention, a novel structural design is adopted, and the internal resistance of the battery can be remarkably reduced, so that the battery with the battery negative electrode structure can better adapt to large-current discharge of the battery, and the service life of the battery is remarkably prolonged. In addition, the battery negative electrode provided by the invention is simple in structure, the battery assembly efficiency can be improved, and the battery manufacturing cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery negative electrode structure, a battery and a preparation method. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and uses a non-aqueous electrolyte solution. As a widely used battery structure, a lithium battery includes a cylindrical battery cell wrapped by a positive electrode sheet and a negative electrode sheet, and the battery cell is housed in a battery case. The two ends of the cylindrical cell are the positive pole and the negative pole respectively, and the positive pole current collector plate and the negative pole current collector plate are respectively set at the two ends as the current lead-out connection terminals. In the prior art, the positive electrode collector plate and the negative electrode collector plate can be formed by pressing the positi...

AI Technical Summary

Problems solved by technology

However, this welding method still has the situation that the contact area between the negative electrode current collector plate and the shell is too small, which easily leads to a large internal resistance, especially in the case of high current discharge, due to the small contact area, the internal resistance of the battery If it is too large, it will often cause overheating, which will have a non-negligible impact on the service life of the battery

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