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

A lithium-ion secondary battery, comprising:

• 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 being a positive electrode post and a negative electrode post, and
• an electrolyte injected in the case;
• the lithium-ion secondary battery further comprising:
• 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;
• 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 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,
• wherein the contact portion of the adapter member is provided with a plurality of recessed portions at an outer surface thereof and a plurality of projections respectively provided in the plurality of recessed portions, a top portion of the each projection is flush with or lower than a plane where an opening of the corresponding recessed portion is positioned.

A lithium-ion secondary battery, comprising:

• 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 being a positive electrode post and a negative electrode post;
• and
• an electrolyte injected in the case;
• the lithium-ion secondary battery further comprising:
• 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;
• 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 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,
• wherein the contact portion of the adapter member is provided with a plurality of grooved portions and a plurality of protrusions respectively provided in the plurality of grooved portions at a bottom surface, a top portion of the each protrusion is flush with or lower than a plane where an opening of the corresponding grooved portion is positioned.