Puncturing needle for acupuncture test of lithium ion battery

The utility model discloses a pricking needle for a pricking test of a lithium ion battery. The pricking needle comprises a needle tip, a first needle body, a second needle body and a third needle body, the diameters of the first needle body, the second needle body and the third needle body are different; the needle tip, the first needle body, the second needle body and the third needle body are sequentially connected to form a three-step pricking needle structure; according to the scheme, the pricking needle tip and the three needle bodies with different diameters are used for continuously puncturing the battery, extruding the interior of the battery and scraping a pole piece and a diaphragm, so that a larger short-circuit area is formed in the battery, and compared with a single-diameter pricking needle, thermal runaway of the lithium ion battery can be reliably triggered. 本实用新型公开了一种锂离子电池针刺试验用刺针，包括针尖，第一针体，第二针体和第三针体；所述第一针体，第二针体和第三针体直径不同；所述针尖，第一针体，第二针体和第三针体依次连接构成三级台阶刺针结构；本方案通过刺针针尖，三个不同直径的针体连续对电池造成刺穿，内部挤压，极片和隔