Top cover assembly of secondary battery, and secondary battery

Abstract

The invention provides a top cover assembly of a secondary battery, and the secondary battery. The top cover assembly of the secondary battery comprises: a top cover plate, which comprises a cover sheet that is provided with a first electrode leading-out hole; and a first pole assembly, which comprises a first pole and a conductive sealing ring, wherein the first pole is configured to pass throughthe first electrode leading-out hole, the conductive sealing ring surrounds the first pole, seals the first electrode leading-out hole and is in a compressed state, the first pole is electrically connected with the cover sheet through the conductive sealing ring, and the resistance of the conductive sealing ring is greater than the resistance of the first pole. According to the invention, the first pole and the cover sheet of the secondary battery can be electrically connected, and the resistance of a resistor arranged between and connected with the first pole and the cover sheet is always maintained stable, so the problem that instable resistance between the first pole and the cover sheet easily causes potential safety hazards like fires can be avoided.

Description

technical field [0001] The invention relates to the technical field of energy storage components, in particular to a top cover assembly of a secondary battery and the secondary battery. Background technique [0002] At present, in the field of power batteries, in order to ensure the safety of the battery during use, the battery cells are usually assembled with a hard shell, and the hard shell that houses the battery cells is generally made of metal materials. In order to ensure the safety of the secondary battery during use, a nail penetration test is usually required. However, if a metal is used to directly conduct the first pole and the shell, since the resistance value of the metal is generally in the milliohm level, the loop current formed when the battery is subjected to a nail penetration test will increase sharply, so it is easy to be damaged at the nail penetration place. Striking and causing fire and other safety hazards. And when the aluminum shell is used for as...

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Problems solved by technology

However, if the metal is used for direct conduction, since the resistance value of the metal is generally in the milliohm level, the circuit current will increase when the battery is short-circuited, so it is easy to cause fire and other safety hazards.

[0003] In order to solve the above problems, a specific method currently adopted is: make the upper plastic of the top cover structure into conductive plastic to realize the resistance connection between the first pole and the cover sheet, and the upper plastic is due to its material characteristics. As a result, its own compression performance is poor, and the first pole and the cover cannot produce a uniform extrusion force on the upper plastic as a whole, that is, during the use of the battery, the upper plastic cannot receive uniform compressive stress

Therefore, the contact area formed at the joint surface between the upper plastic and the cover sheet or the joint surface between the upper plastic and the first pole will be unstable (for example, with the effec

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