Lithium-ion secondary battery having a short-circuit triggering function

摘要

The present disclosure provides a lithium-ion secondary battery, having a case made from a conductive material; a cell received in the case; a cap assembly mounted to the case in a sealing way and equipped with electrode posts electrically connected to the cell, the electrode posts are a positive post and a negative electrode post; an electrolyte injected in the case; and at least one adapter member. Each adapter member is made from a conductive material and it has a connection portion fixedly connected to the corresponding one electrode post equipped to the cap assembly; and a contact portion extending downwardly into a space between the cell and the case from the connection portion at a lateral side of the cell. The contact portion contacts with the case to realize a short-circuit between the electrode posts when the case is crushed under an external force.

主权项

1. A lithium-ion secondary battery, comprising:
a case made from a conductive material; a cell received in the case, the cell having two main surfaces and two lateral sides; a cap assembly mounted to the case in a sealing way and equipped with electrode posts electrically connected to the cell, the electrode posts being a positive electrode post and a negative electrode post; and an electrolyte injected in the case; at least one adapter member, the each adapter member being made from a conductive material, and the each adapter member comprising:
a connection portion fixedly connected to the corresponding one electrode post equipped to the cap assembly; anda pair of contact portions extending downwardly into a space between the cell and the case from the connection portion at a lateral side of the cell, each contact portion contacting with the case to realize a short-circuit between the positive electrode post and the negative electrode post when the case is crushed under an external force; and an insulative film located between the case and the cell and surrounding the at least one adapter member, wherein the pair of contact portions each define a surface that is perpendicular to the two lateral sides of the cell and parallel to the two main surfaces of the cell, each contact portion is provided with protruded portions distributed along an edge of the contact portion and protruding out of the corresponding surface defined by the contact portion, the protruded portions of the pair of contact portions are configured to point in two opposite directions towards the case such that the protruded portions puncture the insulative film to contact with the case to realize the short-circuit between the positive electrode post and the negative electrode post when the case is crushed under the external force.