Circuit breaker, power converter, energy storage system, and electric vehicle

A power converter, wherein a direct current input end of the power converter is configured to connect to a photovoltaic module or an energy storage battery, and an alternating current output end of the power converter is configured to connect to a power grid or a load;

• the power converter comprises a DC/AC conversion circuit and a circuit breaker,
• wherein the circuit breaker comprises:
• two through-current busbars, wherein the two through-current busbars are arranged in a first direction;
• and
• two arc-extinguishing gate plate groups, wherein the two arc-extinguishing gate plate groups are spaced from each other in the first direction, the two arc-extinguishing gate plate groups and the two through-current rows are respectively arranged in a second direction, the second direction is perpendicular to the first direction, each arc-extinguishing gate plate group comprises a plurality of arc-extinguishing gate plates, each arc-extinguishing gate plate group comprises one arc-extinguishing gate plate, a distance between the one arc-extinguishing gate plate and the through-current busbar is a maximum distance between the arc-extinguishing gate plate group and the through-current busbar in the second direction, and the one arc-extinguishing gate plate in one of the arc-extinguishing gate plate groups is connected to the one arc-extinguishing gate plate in the other arc-extinguishing gate plate group;
• and
• when the circuit breaker is turned on, the two through-current busbars are connected, or when the circuit breaker is turned off, end parts that are respectively of the two through-current busbars and that are close to each other in the first direction are bent toward the two arc-extinguishing gate plate groups respectively, to disconnect the two through-current busbars and form an arc, and the two arc-extinguishing gate plate groups are configured to extinguish the arc;
• wherein the circuit breaker is connected between the direct current input end and the DC/AC conversion circuit, or the circuit breaker is connected between the DC/AC conversion circuit and the alternating current output end;
• and
• when a current flowing through two through-current busbars of the circuit breaker is greater than a preset threshold, the two through-current busbars are disconnected.

An energy storage system, wherein the energy storage system comprises a plurality of battery packs connected in series and a circuit breaker,

• wherein the circuit breaker comprises:
• two through-current busbars, wherein the two through-current busbars are arranged in a first direction;
• and
• two arc-extinguishing gate plate groups, wherein the two arc-extinguishing gate plate groups are spaced from each other in the first direction, the two arc-extinguishing gate plate groups and the two through-current rows are respectively arranged in a second direction, the second direction is perpendicular to the first direction, each arc-extinguishing gate plate group comprises a plurality of arc-extinguishing gate plates, each arc-extinguishing gate plate group comprises one arc-extinguishing gate plate, a distance between the one arc-extinguishing gate plate and the through-current busbar is a maximum distance between the arc-extinguishing gate plate group and the through-current busbar in the second direction, and the one arc-extinguishing gate plate in one of the arc-extinguishing gate plate groups is connected to the one arc-extinguishing gate plate in the other arc-extinguishing gate plate group;
• and
• when the circuit breaker is turned on, the two through-current busbars are connected, or when the circuit breaker is turned off, end parts that are respectively of the two through-current busbars and that are close to each other in the first direction are bent toward the two arc-extinguishing gate plate groups respectively, to disconnect the two through-current busbars and form an arc, and the two arc-extinguishing gate plate groups are configured to extinguish the arc;
• and
• the circuit breaker is connected to a series loop of the plurality of battery packs;
• and
• when a current flowing through two through-current busbars of the circuit breaker is greater than a preset threshold, the two through-current busbars are disconnected.