Importance

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Abstract

This invention belongs to the field of power battery technologies, and in particular, to a power battery. The power battery comprises a battery shell, a cell accommodated in the battery shell, an electrolyte filled inside the battery shell, and a top cover assembled in a sealed way to the battery shell; a cathode tab and an anode tab are positioned on a front end of the cell; and a cathode transit plate is positioned between the top cover and the cathode tab, wherein a melting region is positioned on the cathode transit plate. Compared with the prior art, this invention, by providing the melting region on the cathode transit plate, is capable of effectively separating the top cover from the cell thereby protecting the top cover from damages when an inner short-circuit or an outer short-circuit occurs on the battery; moreover, the melting region forms a fragile place for a current, and when a large current is generated due to an inner short-circuit or an outer short-circuit of the battery, the region where the melting region is located may melt immediately, where a melting position is accurate and sensitivity is high, thereby greatly improving safety performance of the battery. In addition, this invention has a simple structure, may be implemented easily, and may be applied for industrial production.

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First Claim