Secondary battery top cover assembly and secondary battery

Abstract

The present application relates to a secondary battery top cover assembly and a secondary battery. The secondary battery top cover assembly includes: a first pole, a conductive member, a second pole and a top cover sheet, the top cover sheet is insulated from the first pole, and the top cover sheet is connected to the first pole The two poles are electrically connected, the secondary battery further includes a contact sheet, the contact sheet is attached to the top cover sheet, the conductive member is insulated from the top cover sheet, and the conductive member includes a pole connection part, a first fusing member and a contact piece connection part, the first fusing member has a melting point lower than that of the pole connection part and the contact piece connection part, the conductive part also includes a connection layer, and the first The fusing member is connected to the pole connection portion via the connection layer, and / or the first fusing member is connected to the contact piece connection portion via the connection layer. This solution improves the safety of the secondary battery.

Description

technical field [0001] The present application relates to the technical field of energy storage devices, in particular to a secondary battery top cover assembly and a secondary battery. Background technique [0002] Because power batteries (such as lithium-ion batteries) have the advantages of high energy density, high power density, many cycle times, and long storage time, they are widely used in portable electronic devices such as mobile phones, digital cameras, and laptop computers. Electric vehicles, electric bicycles and other electric vehicles and large and medium-sized electric equipment such as energy storage facilities have broad application prospects, and become the key to solving global problems such as energy crisis and environmental pollution. [0003] When the power battery is overcharged, the decomposition of the electrolyte in the power battery will increase the internal pressure of the power battery and cause the battery to catch fire and explode. In order ...

AI Technical Summary

Problems solved by technology

However, when the connection strength between the fuse member and the negative electrode conductor is low, the contact resistance between the two will be large, which will cause the fuse member to be blown when the short circuit current is overcharged under normal temperature conditions. After the fuse member is blown, it will cause The overcharge problem of the power battery under normal temperature cannot be solved, which reduces the safety of the secondary battery

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