Accumulator battery pack, comprising devices for passive magnetic between accumulators and busbars, and, where appropriate, passive shunt of one or more accumulators in case of failure of these ones

A battery pack comprising:

• a plurality of electrochemical batteries or accumulators, each comprising:
• a housing or a flexible packaging,
• a first output terminal and a second output terminal of an opposite polarity to the first output terminal;
• at least one of the output terminals comprising:
• an electrically conductive part,
• a magnetic lock comprising a permanent magnet;
• at least one ferromagnetic part secured to an electrical connecting busbar, called busbar, forming a closure plate of a magnetic circuit with the magnetic lock of the output terminal;
• the battery pack being configured such that:
• i/ in normal operation of the accumulator, magnetic attraction force of the permanent magnet of the output terminal on the closure plate of a first busbar, in a closed magnetic circuit configuration, ensures the mechanical and electrical connection between the output terminal and the first busbar,
• ii/ upon a failure of the accumulator provoking an overheating thereof, the permanent magnet of the output terminal heats up and at least to a temperature from which it loses its magnetic properties, to the point of mechanical disconnection between the output terminal and the first busbar, which causes the accumulator to drop through gravity.