Lithium secondary battery having thermal switch

Details Lithium secondary battery having thermal switch Lithium secondary battery having thermal switch

H - Electricity

01

M

H01M 10/24 (2006.01) H01M 2/34 (2006.01) H01M 6/10 (2006.01) H01M 6/50 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2230575

Provided is a lithium secondary battery comprising an electrode assembly which consists of a cathode, an anode and a separator laminated therebetween, and a battery case in which the electrode assembly is placed, said lithium secondary battery characterized by having a thermal switch which has a mechanism for electrically connecting the cathode and the anode at a portion other than an active material-contained layer in accordance with an increase in the battery temperature. The lithium secondary battery can prevent itself from being left in a charged condition after having an unusual trouble, and can operate the safety device even when its internal pressure decreases.

La présente invention concerne une pile au lithium constituée par une paire d'électrodes, soit une anode et une cathode, et un séparateur intercalé entre les deux électrodes, le tout placé dans un conteneur. La pile de cette invention se distingue par l'adjonction d'un thermocontact commandant un mécanisme de mise en contact électrique de l'anode et de la cathode autrement que par une couche contenue dans la matière active lorsque la température de la pile augmente. La pile au lithium de cette invention est conçue pour ne pas demeurer chargée après une anomalie, et ce mécanisme de sécurité opère même dans le cas d'une baisse de la pression à l'intérieur de la pile.

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