Battery cell and electric device

Abstract

The embodiment of the invention relates to the technical field of batteries, and discloses a battery cell and an electric device. The battery cell comprises an electrode assembly and a shell for accommodating the electrode assembly; the electrode assembly comprises a first pole piece and a second pole piece. The first pole piece comprises a current collector, a connecting piece and a tab. The current collector comprises a plurality of flat parts which are arranged in a stacked mode. The fixed end of the connecting piece is connected to the flat parts, the free end of the connecting piece faces the flat parts and is close to or attached to the flat parts, and the free end can be elastically bent relative to the current collector. The first end of the tab is fixed to the connecting piece, and the second end of the tab exceeds the flat parts. On one hand, the connecting piece has a certain elastic moving space and can transfer impact on the tab, and on the other hand, part of impact force can be removed in the process that the connecting piece is elastically bent to absorb energy, so that the risk that the tab loses efficacy when falling off can be reduced by the battery cell.

Description

【Technical field】 [0001] Embodiments of the present invention relate to the technical field of batteries, and in particular, to a battery cell and an electrical device. 【Background technique】 [0002] A battery cell is a device that converts external energy into electrical energy and stores it inside, so as to supply power to external electrical devices (such as portable electronic devices) when needed. At present, batteries are widely used in electrical devices such as mobile phones, tablets, and notebook computers. [0003] Generally, a battery cell includes a case assembly and an electrode assembly disposed in the case assembly. The electrode assembly generally includes a positive electrode sheet, a negative electrode sheet arranged alternately in a cycle, and a separator arranged between the two and used to separate the two. Wherein, the pole piece (positive pole piece or negative pole piece) includes a current collector, a tab with one end welded to the current collec...

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Problems solved by technology

[0004] The inventors of the present invention found in the process of realizing the present invention that: at present, the tabs are fixed to the pole piece by welding processes such as laser welding and ultrasonic welding, and when the user accidentally drops the battery cell or accidentally drops the electric device with the battery cell At the same time, the welding part of the tab and the current collector is easily damaged under the impact force of the drop, resulting in the failure of the tab due to desoldering

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