Lower plastic, housing and battery

Abstract

This utility model relates to the field of batteries, providing a lower plastic core, a casing, and a battery. The lower plastic core includes a lower plastic core body, on which a gas guide groove is formed. The gas guide groove is recessed along the thickness direction of the lower plastic core and extends radially along the lower plastic core body. In the case of a missing seal, the gas guide groove is suitable for establishing a fluid passage for helium detection between the inside and outside of the battery. The presence of the gas guide groove in the lower plastic core allows helium to flow quickly and smoothly between the inside and outside of the battery even when a seal is missing. Compared to the case without a gas guide groove, helium can reach the detection equipment more quickly, greatly shortening the detection time, improving the detection efficiency on the production line, and helping to detect the problem of missing seals in a timely manner, preventing unqualified products from entering subsequent production stages.

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