Cells, batteries and electronic equipment

Abstract

The invention discloses an electric core, battery and electronic equipment. The electric core comprises: a first pole piece and a second pole piece, the first pole piece comprises: a first current collector and a first active material layer, and the first active material layer Set on the surface of the first current collector; the second pole piece includes: the second current collector and the second active material layer, the second current collector includes: the initial section and the first bending section, the first bending section and the starting section The initial section is connected; the second active material layer is arranged on the surface of the second current collector; wherein, the current collector opposite to the initial section and the first bent section is the second current collector. Therefore, there is no opposing area between the first current collector and the second current collector inside the battery core, so that the surface of the tab disposed inside the battery core does not need to be pasted with insulating glue, which can increase the energy density of the battery core; in addition, due to The absence of this opposing area will not cause direct contact between the first current collector and the second current collector inside the battery cell to cause a short circuit, which can improve the use safety of the battery cell.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a battery cell, battery and electronic equipment. Background technique [0002] With the development of commercialization of lithium-ion batteries, the market has higher and higher requirements for the energy density of the battery. The inside of the conventional cell winding structure needs an empty coil separator when winding, resulting in four more layers of separator inside, and the space The utilization rate is reduced, thereby affecting the energy density of the battery. [0003] In order to increase the energy density of the battery, two layers of separator are omitted inside the existing cell structure, which includes the first pole piece, the second pole piece, the first pole piece and the second pole piece, and the starting end of the first pole piece There is an empty aluminum foil at the bottom, and the empty aluminum foil is longer than the empty copper foil, that is, the e...

AI Technical Summary

Problems solved by technology

[0004] However, the energy density of the above-mentioned existing cell structure still needs to be improved, and the empty aluminum foil in this structure is longer than the empty copper foil, and the soldering burr of the second tab is relatively hard, and it is easy to pierce the gap between the empty aluminum foil and the empty copper foil. The isolation film, which leads to the direct contact between the aluminum foil and the copper foil, causes a short circuit, which has a high safety risk, and for the narrow battery core, it cannot be processed when the two tabs are welded inside

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