Internally-arranged protection device type lithium battery

Abstract

The invention relates to an internally-arranged protection device type lithium battery. The internally-arranged protection device type lithium battery comprises a battery cover plate, a battery shell and a coiling core located in the battery shell, wherein the coiling core is formed by overlapping and winding a negative pole piece, a membrane and a positive pole piece; a fixed ring, an insulating cover plate and an insulating gasket are sequentially arranged between the battery cover plate and the coiling core in a close fitting manner; the insulating gasket is used for tightly pressing the coiling core; the fixed ring is welded on the inner wall of the battery shell; the lithium battery further comprises a first negative pole current collector, a second negative pole current collector and a fuse connected between the first negative pole current collector and the second negative pole current collector; one end of the first negative pole current collector is located on the insulating gasket and the other end of the first negative pole current collector extends to an opening of the battery shell and is tightly pressed on the inner wall of the battery shell by the battery cover plate; one end of the second negative pole current collector is located on the insulating gasket and the other end of the second negative pole current collector extends towards the bottom of the battery shell and is welded with the negative pole piece. According to the internally-arranged protection device type lithium battery, an internally-arranged protection device with a simple structure is arranged so that the short-circuit protection capability and the shake-proof capability of the lithium battery are improved.

Description

technical field

[0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery that can realize self-protection through a built-in protection device under short-circuit conditions. Background technique

[0002] In recent years, with the frequent occurrence of safety accidents, government departments have continuously increased the supervision of safety production. In the field of battery manufacturing, especially for batteries used in areas with relatively large safety hazards, such as batteries used in production equipment such as gas and coal mines, national policies mandate that the quality of batteries must meet the corresponding explosion-proof certification standards.

[0003] At present, those skilled in the art often use an external protection device to perform explosion-proof treatment on the battery. For example, a fuse is provided outside the battery, and the fuse is connected between the electrode terminal and the el...

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