Battery cell, battery and electronic equipment

Abstract

The invention discloses a battery cell, a battery and electronic equipment. The battery cell 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. The first active material layer is arranged on the surface of the first current collector. The second pole piece comprises a second current collector and a second active material layer. The second current collector comprises a starting section and a first bending section, and the first bending section is connected with the starting section. The second activematerial layer is arranged on the surface of the second current collector. The current collector opposite to the starting section and the first bending section is the second current collector. Therefore, there is no relative area of the first current collector and the second current collector inside the battery cell so that the electrode lug surface arranged inside the battery cell does not need to be pasted with insulating glue and the energy density of the battery cell can be improved; besides, the relative area is not arranged, direct contact between the first current collector and the second current collector inside the battery cell does not occur and short circuit does not occur and thus the use safety of the battery cell can be improved.

Description

Technical field [0001] The invention relates to the field of batteries, in particular to a battery, a battery and an electronic device. Background technique [0002] With the development of the commercialization of lithium-ion batteries, the market has higher and higher requirements for the energy density of the battery. The conventional battery core winding structure requires an empty roll isolation film during winding, resulting in four more isolation films inside, and 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 isolation films are omitted inside the existing battery cell structure, which includes the first pole piece, the second pole piece, the first pole and the second pole, and the start end of the first pole piece The hollow aluminum foil is longer than the hollow copper foil, that is, the hollow aluminum foil and the hollow copper foil are opposite, and the t...

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

Images