Sealed accumulator equipped with a safety device

Sealed accumulator comprising:

• an electrochemical bundle comprising at least one positive electrode and one negative electrode arranged in a container;
• positive and negative current output terminals arranged on a cover of the container and respectively connected to the positive and negative electrodes;
• a circuit-breaker comprising:
• a connecting piece extending over the top of the cover of the container and suitable for conducting an electrical current of between 30 and 100 A between an electrode of one polarity and its current output terminal;
• and
• a membrane, electrically insulated from the connecting piece and suitable for deforming under the effect of an overpressure in the container, the deformation of the membrane being suitable for breaking the connecting piece;
• wherein the connecting piece has two weakened points, a first weakened point being shaped to ensure the rupture of the connecting piece and a second weakened point being shaped to ensure a tilting of the broken connecting piece, the first weakened point of the connecting piece comprising two symmetrical V-shaped weakened areas situated respectively on each face of the connecting piece.

Sealed accumulator comprising:

• an electrochemical bundle comprising at least one positive electrode and one negative electrode arranged in a container;
• positive and negative current output terminals arranged on a cover of the container and respectively connected to the positive and negative electrodes;
• a circuit-breaker comprising:
• a connecting piece extending over the top of the cover of the container and suitable for conducting an electrical current of between 30 and 100 A between an electrode of one polarity and its current output terminal;
• and
• a membrane, electrically insulated from the connecting piece and suitable for deforming under the effect of an overpressure in the container, the deformation of the membrane being suitable for breaking the connecting piece;
• wherein the connecting piece has a general shape of a rigid rectangular plate and a section for passage of the current having a cross-sectional area of between 2 mm2 and 3 mm2.