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

Abstract

The invention provides a circuit breaker, a power converter, an energy storage system and an electric vehicle, the circuit breaker comprises two through-flow rows and two arc extinguishing grid sheet groups, and the two through-flow rows are arranged along a first direction. The two arc extinguishing grid sheet groups are arranged at intervals in the first direction, and the two arc extinguishing grid sheet groups and the two through-flow rows are arranged in the second direction. Each arc extinguishing grid sheet group comprises an arc extinguishing grid sheet, the distance between one arc extinguishing grid sheet and the through-flow row is the maximum distance between one arc extinguishing grid sheet group and the through-flow row along the second direction, and one arc extinguishing grid sheet in one arc extinguishing grid sheet group is connected with one arc extinguishing grid sheet in the other arc extinguishing grid sheet group. When the circuit breaker is closed, the two through-flow rows are connected; when the circuit breaker is disconnected, the ends, close to each other in the first direction, of the two through-flow rows are bent towards the two arc extinguishing gate sets respectively, so that the two through-flow rows are disconnected and form an arc, and the two arc extinguishing gate sets are used for extinguishing the arc. The circuit breaker has strong breaking capacity and is suitable for a power system with relatively high voltage.

Description

Circuit breakers, power converters, energy storage systems and electric vehicles

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on September 28, 2023, with application number 202322671550.3, and priority to the Chinese patent application entitled “Circuit Breaker, Power Converter, Energy Storage System and Electric Vehicle”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of circuit breakers, and in particular to a circuit breaker, a power converter, an energy storage system and an electric vehicle. Background Art

[0003] A circuit breaker is an electronic component used to connect or disconnect current in one or more circuits. It typically plays a control and protective role in power systems, and in the process of interrupting the current, an arc is generated. The generation of an arc prolongs the circuit's interruption time, and the high arc temperature can easily endanger the safe operation of the power system, causing casualties and significant property losses. During use, the circuit breaker needs to cool the arc to reduce the damage it causes. However, existing technologies have poor arc cooling performance, making circuit breakers difficult to apply to higher-voltage power systems.

[0004] Summary of the Invention

[0005] The present application provides a circuit breaker, a power converter, an energy storage system and an electric vehicle.

[0006] In a first aspect, the present application provides a circuit breaker, comprising two through-current bars and two groups of arc-quenching grids, the two through-current bars being arranged along a first direction. The two groups of arc-quenching grids are spaced apart along the first direction, and the two groups of arc-quenching grids are respectively arranged along a second direction perpendicular to the first direction. Each group of arc-quenching grids comprises a plurality of arc-quenching grids. Each group of arc-quenching grids comprises one arc-quenching grid, and along the second direction, the distance between the arc-quenching grid and the through-current bar is the maximum distance between the arc-quenching grid groups of the group. The arc-quenching grid in one group of arc-quenching grids is connected to the arc-quenching grid in the other group of arc-quenching grids. When the circuit breaker is closed, the two through-current bars are connected. When the circuit breaker is disconnected, the ends of the two current bars approaching each other along the first direction are bent toward the two groups of arc-extinguishing grids, so that the two current bars are disconnected and an arc is formed. The two groups of arc-extinguishing grids are used to extinguish the arc.

[0007] In the embodiment of the present application, two sets of arc-quenching grids are provided, and when the circuit breaker is disconnected, the two ends are respectively bent close to the two sets of arc-quenching grids, so that the arc generated when the two ends are disconnected can enter the two sets of arc-quenching grids respectively. On the one hand, this can facilitate the rapid cooling and extinguishing of the arc, thereby improving the breaking capacity of the circuit breaker. On the other hand, because the circuit breaker includes two sets of arc-quenching grids, the two sets of arc-quenching grids have a stronger arc extinguishing ability, making the circuit breaker suitable for higher voltage AC or DC power systems. On the other hand, the two arc-quenching grids farthest from the current bar in the two sets of arc-quenching grids are connected. The arc entering one set of arc-quenching grids can also enter the other set of arc-quenching grids through the two arc-quenching grids farthest from the current bar. The arc movement path is longer, thereby improving the arc extinguishing effect of the arc-quenching grid sets.

[0008] In one possible implementation, the circuit breaker further includes an arc-shaped protrusion, which is used to connect the one arc-quenching grid in the two groups of arc-quenching grids. Along the first direction, the arc-shaped protrusion at least partially overlaps with the projections of the two groups of arc-quenching grids, and along the second direction, the distance between the arc-shaped protrusion and the through-current bar is less than the distance between the one arc-quenching grid and the through-current bar. The two ends of the arc-shaped protrusion along the first direction are respectively used to connect the two arc-quenching grids in the two groups of arc-quenching grids that are farthest from the through-current bar. By providing the arc-shaped protrusion, the arc generated when the two ends are disconnected can be divided into two arc segments by the arc-shaped protrusion. The two arc segments enter the two groups of arc-quenching grids and are extinguished respectively, which is conducive to rapid cooling and extinguishing of the arc, thereby improving the breaking capacity of the circuit breaker. It also improves the arc extinguishing capability of the circuit breaker, allowing the circuit breaker to extinguish arcs at higher voltages.

[0009] In one possible implementation, when the circuit breaker is disconnected, the distance between the end portion and the arc-shaped protrusion is greater than or equal to half the distance between the two end portions, and less than or equal to twice the distance between the two end portions. Keeping the distance between the end portion and the arc-shaped protrusion within an appropriate range facilitates the generated arc being split into two segments by the arc-shaped protrusion, with the two segments entering two sets of arc-extinguishing grids for extinguishing. This facilitates rapid arc cooling and extinguishing, thereby improving the circuit breaker's breaking capacity.

[0010] In one possible implementation, each current-carrying bar includes a connected conductive portion and a bent portion. The two bent portions of the two current-carrying bars are located between the two conductive portions, and the end portion is the end of the bent portion facing away from the conductive portion. When the circuit breaker is closed, along the second direction, the thickness of the connection between the two bent portions is less than the thickness of the bent portion, and the thickness of the connection between the bent portion and the conductive portion is less than the thickness of the conductive portion. When the circuit breaker is open, the bent portion bends relative to the conductive portion to separate the ends of the two bent portions.

[0011] In this embodiment of the present application, the thickness of the connection between the two ends is relatively small, making it easier to break the connection between the two bent portions, which is more conducive to rapid disconnection of the circuit breaker. When the circuit breaker is disconnected, the bent portion is more easily bent relative to the conductive portion, so that the ends of the two bent portions are close to the arc-extinguishing grid assembly, allowing the arc-extinguishing grid assembly to extinguish the arc generated when the two ends are disconnected.

[0012] In one possible implementation, along the first direction, the distance between the two conductive portions is less than or equal to the distance between the two arc-quenching grid groups. The larger distance between the two arc-quenching grid groups facilitates arc cooling and extinguishing within the two arc-quenching grid groups, prevents damage to the arc-quenching grids due to excessive piston impact when the circuit breaker is opened, and improves the utilization rate of the two arc-quenching grid groups.

[0013] In one possible implementation, when the circuit breaker is closed, along the first direction, the sum of the lengths of the two bent portions is greater than or equal to the distance between the two conductive portions. The greater lengths of the two bent portions facilitate connection of the two conductive portions via the two bent portions when the circuit breaker is closed.

[0014] In one possible implementation, the circuit breaker further includes two arc-starting plates, arranged along the first direction and respectively located between one of the through-current bars and one of the arc-extinguishing grid groups, and between another through-current bar and another of the arc-extinguishing grid groups. The two arc-starting plates are respectively connected to the two conducting portions, and when the circuit breaker is disconnected, the two end portions respectively abut against the mutually adjacent ends of the two arc-starting plates.

[0015] In an embodiment of the present application, the arc-striking piece is connected to the conductive part, so that the arc-striking piece and the conductive part can be set at the same potential. When the circuit breaker is disconnected, the two ends respectively abut against the two arc-striking pieces, so that the arc generated when the two ends are disconnected can be divided into two arc segments by the two arc-striking pieces. Since the arc-striking piece and the conductive part are at the same potential, the arc is more easily drawn into the arc-striking piece. The two arc segments enter the two groups of arc extinguishing grids respectively and are extinguished, which is conducive to the rapid cooling and extinguishing of the arc, thereby improving the breaking capacity of the circuit breaker. And because the arc extinguishing capacity of the circuit breaker is enhanced, the circuit breaker can achieve arc extinguishing at a higher voltage.

[0016] In one possible implementation, each arc-striking piece includes a main body portion and an arc-striking segment that are connected and intersecting. The two arc-striking segments of the two arc-striking pieces are located between the two main bodies. The main body portion is connected to the conductive portion, and the arc-striking segments bend from the main body portion toward a direction away from the current-carrying bar. The distance between the main body portion and the conductive portion along the second direction is less than the length of the bent portion. When the circuit breaker is disconnected, the end of the bent portion abuts against the arc-striking segment. The distance between the main body portion and the conductive portion along the second direction is small. By providing the arc-striking segment, when the circuit breaker is disconnected, the end of the bent portion can smoothly contact the arc-striking segment, thereby making it easier for the arc to be drawn into the arc-striking piece.

[0017] In one possible implementation, along the first direction, a projection of the arc striking segment and a projection of the arc quenching grid assembly at least partially overlap. When the circuit breaker is open, along the first direction, a projection of the arc striking segment and a projection of the bent portion at least partially overlap, and a projection of the arc quenching grid assembly and a projection of the bent portion at least partially overlap.

[0018] In the embodiments of the present application, on the one hand, by providing an arc-strike section that bends toward the arc-extinguishing grid group, the distance between the main body and the conducting portion is reduced, and the end portion can also abut the arc-strike section, which is beneficial to reducing the size of the circuit breaker along the second direction. On the other hand, by providing the arc-strike piece, the space between the end portion and the conducting portion can be fully utilized to arrange more arc-extinguishing grids, which is beneficial to extinguishing the arc. Since the arc is introduced into the arc-strike piece, the main body of the arc-strike piece is located between the first arc-extinguishing grid and the conducting portion, so that the distance between the arc-extinguishing grid group and the main body is close, it is also possible to introduce the arc into the first arc-extinguishing grid to achieve a better arc extinguishing effect. In the present application, the conducting portion, the arc-strike piece, and the arc-extinguishing grid group are arranged compactly, which is not only beneficial to reducing the size of the circuit breaker along the second direction, but also allows more arc-extinguishing grids to be arranged in a smaller space, so that the circuit breaker can achieve higher voltage AC or DC arc extinguishing.

[0019] In one possible implementation, the circuit breaker further includes an ignition element and a piston, wherein the ignition element, the piston, the two flow bars, and the two sets of arc-quenching grids are arranged along the second direction. The ignition element is configured to generate a driving force to drive the piston in the second direction, and the piston is configured to move in the second direction to disconnect the two flow bars, thereby tripping the circuit breaker. A circuit breaker that uses an ignition element to generate energy to disconnect the flow bars has a fast response speed and can quickly interrupt fault currents when a power system fault occurs.

[0020] In one possible implementation, the width of the piston along the first direction is less than or equal to the distance between the two conductive portions. When the circuit breaker is disconnected, at least a portion of the piston is located between the two bent portions along the first direction. The smaller size of the piston allows for a greater movement distance in the second direction, resulting in a greater degree of bending of the bent portion, bringing the bent portion closer to the arc-quenching grid assembly, thereby facilitating the arc extinguishing by the arc-quenching grid assembly when the two ends are disconnected.

[0021] In one possible implementation, the circuit breaker further includes an arc extinguishing chamber housing, wherein the two arc extinguishing grid groups and at least a portion of the two through-current bars are housed within the arc extinguishing chamber housing. The arc extinguishing chamber housing includes two side panels disposed opposite each other along the first direction, each side panel including a through hole extending through the side panels along the first direction. The arc extinguishing grids are parallel to the first direction, and the plurality of arc extinguishing grids are arranged at intervals along the second direction. The through hole connects the gap between two adjacent arc extinguishing grids in one arc extinguishing grid group.

[0022] When the circuit breaker opens, the high-temperature, high-pressure gas generated by the arc flows through the gaps between adjacent arc-quenching grids in the arc-quenching grid assembly to the side panels and is discharged through the through-holes in the side panels to the outside of the arc-quenching chamber housing. When the fault current is interrupted, the through-holes facilitate the rapid entry of the arc into the arc-quenching grid assembly and cool the high-temperature gas generated by the arc.

[0023] In one possible implementation, the arc-quenching grids intersect the first direction, and the plurality of arc-quenching grids are spaced apart and arranged in a direction perpendicular to the arc-quenching grids. The through-holes connect the gaps between two adjacent arc-quenching grids in a group of arc-quenching grids. The arc-quenching grids are tilted to facilitate the discharge of high-temperature airflow generated by the arc.

[0024] In a second aspect, the present application provides a power converter, wherein the DC input terminal of the power converter is used to connect to a photovoltaic module or an energy storage battery, and the AC output terminal of the power converter is used to connect to a power grid or a load. The power converter includes a DC / AC conversion circuit, a controller, and a circuit breaker as described above, wherein the circuit breaker is connected between the DC input terminal and the DC / AC conversion circuit, or the circuit breaker is connected between the DC / AC conversion circuit and the AC output terminal. When the current flowing through the two current bars of the circuit breaker is greater than a preset threshold, the two current bars are disconnected.

[0025] In a third aspect, the present application provides an energy storage system comprising a controller, a plurality of battery packs connected in series, and a circuit breaker as described above, wherein the circuit breaker is connected to the series circuit of the plurality of battery packs. When the current flowing through two current bars of the circuit breaker exceeds a preset threshold, the two current bars are disconnected.

[0026] In a fourth aspect, the present application provides an electric vehicle comprising a controller battery cluster, an inverter circuit, a motor, and the circuit breaker described above. The battery cluster is configured to output direct current (DC), and the inverter circuit converts the DC into three-phase alternating current (AC) and transmits it to the motor. The circuit breaker is connected between the battery cluster and the DC terminal of the inverter circuit, or alternatively, between the AC terminal of the inverter circuit and the motor. When the current flowing through the two current bars of the circuit breaker exceeds a preset threshold, the two current bars are disconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0028] FIG1 is a schematic diagram of a photovoltaic energy storage system provided in one embodiment of the present application;

[0029] FIG2 is a schematic diagram of an energy storage system provided in an embodiment of the present application;

[0030] FIG3 is a schematic diagram of a vehicle energy storage system provided in an embodiment of the present application;

[0031] FIG4 is a cross-sectional view of a circuit breaker provided in an embodiment of the present application in a closed state;

[0032] FIG5 is a cross-sectional view of a circuit breaker provided in an embodiment of the present application when in an off state;

[0033] FIG6 is a schematic diagram of a through-flow row provided in an embodiment of the present application;

[0034] FIG7 is a partial exploded view of a circuit breaker provided in an embodiment of the present application;

[0035] FIG8 is a partial exploded view of a circuit breaker provided in an embodiment of the present application;

[0036] FIG9 is a partial perspective view of a circuit breaker provided in an embodiment of the present application;

[0037] FIG10 is a partial exploded view of a circuit breaker provided in an embodiment of the present application;

[0038] FIG11 is a partial schematic diagram of a circuit breaker provided in an embodiment of the present application;

[0039] FIG12 is a three-dimensional diagram of a circuit breaker provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0041] As used herein, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more.

[0042] In addition, in this article, directional terms such as "upper" and "lower" are defined relative to the orientation of the structure schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the structure.

[0043] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of this application are explained and described below.

[0044] DC: Direct Current. DC / DC stands for direct current to direct current conversion, meaning direct current is input and direct current is output.

[0045] AC: Alternating Current. DC / AC stands for direct current to alternating current, or alternating current to direct current.

[0046] The circuit breaker of the present application can be effectively applied to power systems with high-voltage circuits, which may include a high-voltage power supply and a load, with one end of the circuit breaker connected to the high-voltage power supply and the other end connected to the load. Furthermore, the circuit breaker of the application can also be used in power systems or power equipment with low-voltage circuits.

[0047] For example, the power system may include a photovoltaic energy storage system. FIG1 is a schematic diagram of a photovoltaic energy storage system provided in one embodiment of the present application. As shown in FIG1 , the photovoltaic energy storage system includes a photovoltaic (PV) panel and a photovoltaic inverter. The photovoltaic inverter is a power converter provided in the present application. Photovoltaic panels convert solar energy into electrical energy. Since photovoltaic panels generate direct current (DC), it is necessary to convert DC into AC through a photovoltaic inverter to facilitate the transmission and utilization of electricity.

[0048] The DC input terminal of the photovoltaic inverter is used to connect to the photovoltaic panel. The photovoltaic inverter includes a direct current to alternating current (DC / AC) conversion circuit, which is used to convert direct current into alternating current.

[0049] In one embodiment, the photovoltaic inverter further includes a maximum power point tracking (MPPT) module. The MPPT module is configured to track the maximum voltage and current values ​​so that the power generation system outputs current at maximum power.

[0050] The MPPT module and DC / DC circuit in the photovoltaic inverter can be provided in the same package device or in different package devices. In one embodiment, the photovoltaic inverter may also not include the MPPT module.

[0051] The MPPT module may include a direct current to direct current (DC / DC) conversion circuit, which is used to stabilize the DC power generated by the PV module (or, in other words, perform voltage conversion processing). The DC power after voltage stabilization can be output to the power energy storage system. One end A of the DC / AC conversion circuit is connected to the MPPT module and an energy storage system, and the other end B is used to connect to the power grid or load. Thus, the DC / AC conversion circuit converts the DC power output by the MPPT module or the energy storage system into AC power, and provides it to the load or the power grid through the AC output end of the photovoltaic inverter.

[0052] In addition, the other end B of the DC / AC conversion circuit can also be connected to another energy storage system via an inverter (i.e., a DC / AC converter). This inverter is used to convert the AC power from the photovoltaic inverter into DC power and store it in the energy storage system. Furthermore, the DC power from the energy storage system can be converted into AC power and supplied to the load or the grid.

[0053] As shown in Figure 1, in one implementation, the circuit breaker provided in the present application can be set in the circuit between the MPPT and the energy storage system and the DC / AC conversion circuit. One of the current bars of the circuit breaker is connected to the MPPT and the energy storage system, and the other current bar of the circuit breaker is connected to the DC / AC conversion circuit. Specifically, when the circuit breaker is located in the photovoltaic inverter, the circuit breaker is connected between the DC input terminal of the photovoltaic inverter and the DC / AC conversion circuit. In this case, the circuit breaker operates in the DC circuit. When the current flowing through the two current bars of the circuit breaker is greater than the preset threshold, the two current bars are disconnected to cut off the electrical connection between the MPPT and the DC / AC conversion circuit and to cut off the electrical connection between the energy storage system and the DC / AC conversion circuit.

[0054] In another implementation, the circuit breaker provided in this application can be disposed between a DC / AC conversion circuit and an output interface of a photovoltaic system. The circuit breaker can cut off the electrical connection between the DC / AC conversion circuit and an AC load or a power grid. That is, one of the circuit breaker's current bars is connected to the DC / AC conversion circuit, and the other current bar is connected to the power grid or load. Specifically, when the circuit breaker is located within a photovoltaic inverter, the circuit breaker is connected between the DC / AC conversion circuit and the AC output terminal of the photovoltaic inverter. In this case, the circuit breaker operates in an AC circuit. When the current flowing through the two current bars of the circuit breaker exceeds a preset threshold, the two current bars are disconnected, thereby cutting off the electrical connection between the photovoltaic system and the load or power grid.

[0055] For example, the power system may include an energy storage system, and FIG2 is a schematic diagram of an energy storage system provided in an embodiment of the present application. As shown in FIG2 , the energy storage system includes one or more battery clusters, each battery cluster includes multiple battery packs, and the multiple battery packs are connected in series. The circuit breaker is connected to the series circuit of the multiple battery packs. In one embodiment, the battery cluster includes an input and output interface, which is used to output direct current to the load or photovoltaic inverter system, and the input and output interface is used to input direct current output from the photovoltaic inverter system. The circuit breaker provided in the present application can be arranged between the input and output interface (or even, the output bus of the battery cluster) and the photovoltaic system and the load. In this case, the circuit breaker operates in a DC circuit. When the current flowing through the two current bars of the circuit breaker is greater than a preset threshold, the two current bars are disconnected to cut off the electrical connection between the energy storage system and the DC load or the photovoltaic inverter system.

[0056] For example, the power system may include a power system in an electric vehicle. FIG3 is a schematic diagram of a vehicle energy storage system provided in an embodiment of the present application. As shown in FIG3 , the electric vehicle includes a power battery and an electric drive system. The power battery includes a battery cluster, and the battery cluster is used to output direct current. The battery cluster includes one or more battery packs connected in series. The electric drive system includes an inverter circuit and a motor. The output port of the battery cluster provides direct current to the inverter circuit, and the inverter circuit converts the direct current into three-phase alternating current and transmits it to the motor, thereby driving the motor.

[0057] In one implementation, the circuit breaker provided herein can be installed in the circuit between the battery cluster and the inverter circuit. Specifically, one of the circuit breaker's current bars is connected to the battery cluster, and the other is connected to the DC busbar of the inverter circuit. In this case, the circuit breaker operates in the DC circuit. When the current flowing through the two current bars of the circuit breaker exceeds a preset threshold, the two current bars disconnect, severing the electrical connection between the battery cluster and the electric drive system.

[0058] In another implementation, the circuit breaker provided herein can be installed in the circuit between the inverter circuit and the motor. Specifically, the circuit breaker can disconnect the electrical connection between the inverter circuit and the motor. Specifically, one of the circuit breaker's current bars is connected to the inverter circuit's AC busbar, and the other current bar is connected to the motor. In this case, the circuit breaker operates in the AC circuit. When the current flowing through the circuit breaker's two current bars exceeds a preset threshold, the two current bars disconnect, severing the electrical connection between the inverter circuit and the motor.

[0059] The circuit breaker provided in this application can also be applied to other power systems that require rapid disconnection of fault currents.

[0060] In addition, although not shown in the figure, the power converter, energy storage system and electric vehicle provided by the present application may also include a controller. When the current flowing through the circuit breaker is greater than a preset threshold, the controller can disconnect the two current-carrying bars of the circuit breaker, thereby interrupting the fault current.

[0061] Please refer to Figures 4 and 5. Figure 4 is a cross-sectional view of the circuit breaker 10 provided in an embodiment of the present application when in a closed state. Figure 5 is a cross-sectional view of the circuit breaker 10 provided in an embodiment of the present application when in an open state. The circuit breaker 10 includes two through-current bars 100 and two groups of arc-quenching grid plates 200. The two through-current bars 100 are arranged along a first direction X, and the two groups of arc-quenching grid plates 200 are arranged at intervals along the first direction X. The two groups of arc-quenching grid plates 200 are arranged along a second direction Y with the two through-current bars 100, respectively. Each group of arc-quenching grid plates 200 includes a plurality of arc-quenching grid plates. The second direction Y is perpendicular to the first direction X. When the circuit breaker 10 is closed, the two current bars 100 are connected (as shown in FIG4 ); when the circuit breaker 10 is open, the ends 101 of the two current bars 100 that are close to each other along the first direction X are bent toward the two sets of arc-extinguishing grid assemblies 200 (as shown in FIG5 ), so that the two current bars 100 are disconnected and an arc is formed. The two sets of arc-extinguishing grid assemblies 200 are used to extinguish the arc.

[0062] The two through-flow rows 100 are respectively denoted as through-flow row 100a and through-flow row 100b, and the ends 101 of the through-flow rows 100a and 100b close to each other along the first direction X are respectively denoted as ends 101a and 101b.

[0063] Referring to Figure 4, when the circuit breaker 10 is closed, the two ends 101 are connected so that the current bars 100a and 100b are connected. When the circuit breaker 10 is connected between the power conversion unit and the DC source, the power conversion unit and the DC source are connected via the current bars 100a and 100b. When the circuit breaker 10 is connected between the power conversion unit and the load, the power conversion unit and the load are connected via the current bars 100a and 100b. In one embodiment, the two current bars 100 are an integrated structure. The two current bars 100 are integrally formed, which improves the connection reliability between the two current bars 100 when the circuit breaker 10 is closed.

[0064] Referring to FIG5 , when the circuit breaker 10 is disconnected, the end 101a and the end 101b separate, disconnecting the through-current bars 100a and 100b, and cutting off the current between the through-current bars 100a and 100b. The power conversion unit and the DC source are then disconnected via the through-current bars 100a and 100b, or the power conversion unit and the load are disconnected via the through-current bars 100a and 100b. For example, when the circuit breaker 10 is used in a power converter and connected between the DC input terminal and the DC / AC conversion circuit, the DC source is the DC input terminal, the power conversion unit is the DC / AC conversion circuit, and the DC input terminal and the DC / AC conversion circuit are disconnected via the circuit breaker 10.

[0065] During the separation process between ends 101a and 101b, a hot, brightly illuminated, and highly conductive gas, known as an arc, is generated between them. An arc is a gas discharge phenomenon that is lightweight and easily changes shape. The generation of an arc prolongs the circuit's disconnection time. If a fault occurs in the power system circuit and the circuit breaker 10 needs to be disconnected, the arc can delay the timely disconnection of the circuit breaker 10, causing greater damage to the power system. Furthermore, the high temperature of the arc can easily cause the circuit breaker 10 to explode, resulting in burns and other accidents. The strong light from the arc can also damage eyesight. Furthermore, the arc's conductivity can easily cause short circuits in other equipment, endangering the safe operation of the power system and causing casualties and significant property losses.

[0066] In the embodiment of the present application, two sets of arc-quenching grid assemblies 200 are provided, and the arc-quenching grid assemblies 200 are composed of the arc-quenching grids within the dashed box in Figure 4. When the two ends 101 are disconnected, the arc can enter the two sets of arc-quenching grid assemblies 200 and be extinguished under the influence of its own magnetic field and airflow. The two sets of arc-quenching grid assemblies 200 are located on the same side of the through-current bar 100. The two sets of arc-quenching grid assemblies 200 are respectively denoted as arc-quenching grid assemblies 200a and arc-quenching grid assemblies 200b. The arc-quenching grid assemblies 200a and arc-quenching grid assemblies 200b are arranged along the second direction Y with the through-current bar 100a, and the arc-quenching grid assemblies 200b and arc-quenching grid assemblies 200b are arranged along the second direction Y with the through-current bar 100b. In one embodiment, along the second direction Y, the projection of the arc-quenching grid assemblies 200a does not overlap with the projection of the through-current bar 100b, and the projection of the arc-quenching grid assemblies 200b does not overlap with the projection of the through-current bar 100a.

[0067] Referring to Figures 4 and 5 , in one embodiment, each arc-quenching grid group 200 includes one arc-quenching grid. Along the second direction Y, the distance between one arc-quenching grid and the through-current bar 100 is the maximum distance between one arc-quenching grid group 200 and the through-current bar 100. One arc-quenching grid in one arc-quenching grid group 200 is connected to one arc-quenching grid in another arc-quenching grid group 200. As shown in Figure 4 , each arc-quenching grid group 200 includes a plurality of arc-quenching grids arranged at intervals, with the one arc-quenching grid being the arc-quenching grid in each arc-quenching grid group 200 that is farthest from the through-current bar 100.

[0068] In the embodiment of the present application, the two arc extinguishing grids farthest from the through-current bar 100 in the two groups of arc extinguishing grid groups 200 are connected. The arc entering the arc extinguishing grid group 200a can also enter the arc extinguishing grid group 200b through the two arc extinguishing grids farthest from the through-current bar 100, and the arc entering the arc extinguishing grid group 200b can also enter the arc extinguishing grid group 200a through the two arc extinguishing grids farthest from the through-current bar 100. The movement path of the arc is longer, thereby improving the arc extinguishing effect of the arc extinguishing grid group 200.

[0069] Referring to Figures 4 and 5 , in one embodiment, the circuit breaker 10 further includes an arc-shaped protrusion 210, which is used to connect one arc-quenching grid in the two arc-quenching grid groups 200. Along a first direction, the arc-shaped protrusion 210 at least partially overlaps with the projections of the two arc-quenching grid groups 200. Along a second direction Y, the distance between the arc-shaped protrusion 210 and the throughflow bar 100 is less than the distance between one arc-quenching grid and the throughflow bar 100. The two ends of the arc-shaped protrusion 210 along the first direction X are respectively used to connect the two arc-quenching grids in the two arc-quenching grid groups 200 that are farthest from the throughflow bar 100. Along the first direction X, the arc-shaped protrusion 210 is located in the gap between the two arc-quenching grid groups 200. The arc-shaped protrusion 210 protrudes from the two arc-quenching grids in the two arc-quenching grid groups 200 that are farthest from the through-current bar 100 toward the through-current bar 100, thereby reducing the distance between the arc-shaped protrusion 210 and the through-current bar 100. The distance between the arc-shaped protrusion 210 and the through-current bar 100 is the minimum distance between the arc-shaped protrusion 210 and the through-current bar 100 along the second direction Y, and is also the distance between the tip 211 of the arc-shaped protrusion 210 and the through-current bar 100 along the second direction Y.

[0070] In the embodiment of the present application, the arc-shaped protrusion 210 is provided so that the arc generated when the two ends 101 are disconnected can be divided into two arc segments by the arc-shaped protrusion 210. The two arc segments enter the two sets of arc extinguishing grid assemblies 200 and are extinguished respectively. This facilitates rapid cooling and extinguishing of the arc, thereby improving the breaking capacity of the circuit breaker 10. It also improves the arc extinguishing capability of the circuit breaker 10, allowing the circuit breaker 10 to extinguish arcs at higher voltages.

[0071] In one embodiment, along the second direction Y, the tip 211 of the arc-shaped protrusion 210 faces the connection between the two bent portions 120. Because the impact force generated by the ignition element is along the second direction Y, the tip 211 of the arc-shaped protrusion 210 faces the connection between the two bent portions 120. This allows the arc to quickly contact the arc-shaped protrusion 210 under the influence of airflow along the second direction Y, allowing the arc to be cooled and extinguished more quickly, thereby improving the breaking capacity of the circuit breaker 10.

[0072] In one embodiment, when the circuit breaker 10 is disconnected, the distance between the end 101 and the arc-shaped protrusion 210 is greater than or equal to half the distance between the two ends 101 and less than or equal to twice the distance between the two ends 101. The distance between the end 101 and the arc-shaped protrusion 210 is the straight-line distance between the end 101 and the tip 211 of the arc-shaped protrusion 210. Keeping the distance between the end 101 and the arc-shaped protrusion 210 within an appropriate range facilitates the arc being split into two segments by the arc-shaped protrusion 210. The two segments then enter the two sets of arc-extinguishing grids 200 and are extinguished. This facilitates rapid arc cooling and extinguishing, thereby improving the breaking capacity of the circuit breaker 10.

[0073] In one embodiment, when the circuit breaker 10 is disconnected, the distances between the two ends 101 and the arc-shaped protrusion 210 are equal to the distance between the two ends 101. This is more conducive to rapid cooling and extinguishing of the arc.

[0074] Referring to Figure 5 , when the circuit breaker 10 is disconnected, the end portion 101a bends toward the arc-quenching grid assembly 200a, and the end portion 101b bends toward the arc-quenching grid assembly 200b. The ends 101a and 101b extend into the gap between the two arc-quenching grid assemblies 200. The two end portions 101 move toward the two arc-quenching grid assemblies 200, respectively, reducing the distance between the two end portions 101 and the two arc-quenching grid assemblies 200, thereby facilitating extinguishing the arc generated when the two end portions 101 are disconnected.

[0075] In the embodiment of the present application, two arc-quenching grid assemblies 200 are provided, and when the circuit breaker 10 is disconnected, the two ends 101 are configured to bend close to the two arc-quenching grid assemblies 200, respectively. This allows the arc generated when the two ends 101 are disconnected to enter the two arc-quenching grid assemblies 200, respectively. This, on the one hand, facilitates rapid cooling and extinguishing of the arc, thereby improving the breaking capacity of the circuit breaker 10. On the other hand, because the circuit breaker 10 includes two arc-quenching grid assemblies 200, the two arc-quenching grid assemblies 200 have a stronger arc extinguishing capability, making the circuit breaker 10 suitable for use in higher voltage AC or DC power systems.

[0076] Referring to Figures 4 and 5 , in one embodiment, the circuit breaker 10 further includes an ignition element and a piston 300 . The ignition element, the piston 300 , the two flow bars 100 , and the two sets of arc-extinguishing grid plates 200 are arranged along the second direction Y. The ignition element is used to generate a driving force to drive the piston 300 in the second direction Y. The piston 300 is used to move in the second direction Y to disconnect the two flow bars 100 and thereby trip the circuit breaker 10 . The ignition element may be an ignition tool. Upon receiving an ignition signal from the controller, the ignition tool ignites and explodes, and the impact force generated by the explosion drives the piston 300 to move. The circuit breaker 10 is a pyrotechnic power-off protection circuit breaker.

[0077] In the embodiment of the present application, the circuit breaker 10 uses an ignition device to explode and generate energy to disconnect the current bar 100. The circuit breaker has a fast response speed and can quickly disconnect the fault current when a fault occurs in the power system.

[0078] In one embodiment, the piston 300 includes a tip portion and a rod portion connected along a second direction Y, along a first direction X. When the circuit breaker 10 is closed, the rod portion, the tip portion, and the two flow bars 100 are arranged sequentially in the second direction Y. The tip portion's dimension along the first direction X gradually increases from the flow bars 100 toward the rod portion along the second direction Y. When the circuit breaker 10 is closed, the tip of the tip portion is positioned directly opposite the connection between the two flow bars 100 along the second direction Y, allowing the piston 300 to quickly disconnect the two flow bars 100 when the circuit breaker 10 is opened.

[0079] Referring to Figures 4 and 5 , in one embodiment, each current bar 100 includes a connected conductive portion 110 and a bent portion 120. The two bent portions 120 of the two current bars 100 are located between the two conductive portions 110, and the end portion 101 is the end of the bent portion 120 facing away from the conductive portion 110. One of the two conductive portions 110 is used to connect to a power conversion unit, such as a DC / AC converter circuit or inverter circuit. The other of the two conductive portions 110 is used to connect to a DC source, a load, or a power grid. The DC source can be a battery pack, a battery cluster, or a photovoltaic panel, and the load can be an electrical device.

[0080] When the circuit breaker 10 is closed, the conductive portion 110 of the current bar 100a, the bent portion 120 of the current bar 100a, the bent portion 120 of the current bar 100b, and the conductive portion 110 of the current bar 100b are sequentially arranged and connected along a first direction X. When the circuit breaker 10 is open, the bent portion 120 of the current bar 100a can bend around the connection point between the conductive portion 110 and the bent portion 120 of the current bar 100a toward the arc-quenching grid assembly 200a. Similarly, the bent portion 120 of the current bar 100b can bend around the connection point between the conductive portion 110 and the bent portion 120 of the current bar 100b toward the arc-quenching grid assembly 200b. Because the two bent portions 120 are bent relative to the two conductive portions 110, respectively, the end portion 101a and the end portion 101b are separated.

[0081] In one embodiment, the width of the piston 300 along the first direction X is less than or equal to the distance between the two conductive portions 110. When the circuit breaker 10 is disconnected, at least a portion of the piston 300 is located between the two bent portions 120 along the first direction X. When the piston 300 moves along the second direction Y, the piston 300 disconnects the two ends 101 and pushes the bent portion 120 around the connection between the conductive portion 110 and the bent portion 120, causing the two bent portions 120 to move toward the two sets of arc-quenching grid assemblies 200. At least a portion of the piston 300 is located between the two bent portions 120. The greater distance the piston 300 moves along the second direction Y results in a greater degree of bending of the bent portion 120, bringing the bent portion 120 closer to the arc-quenching grid assemblies 200. This facilitates the arc-quenching grid assemblies 200 in extinguishing the arc generated when the two ends 101 are disconnected.

[0082] In one embodiment, when the circuit breaker 10 is disconnected, along the first direction X, at least a portion of the rod of the piston 300 is located between the two bent portions 120 .

[0083] Referring to Figures 4 and 6 , in one embodiment, when the circuit breaker 10 is closed, along the second direction Y, the thickness of the connection between the two bent portions 120 is less than the thickness of the bent portion 120 itself. Specifically, the thickness of the connection between the two end portions 101 is less than the thickness of the bent portion 120. The thickness of the bent portion 120 is the maximum thickness within the bent portion 120. As shown in Figure 6 , the thickness of the connection between the two bent portions 120 is d1, and the thickness of the bent portion 120 is d2. The smaller thickness of the connection between the two end portions 101 facilitates breaking the connection between the two bent portions 120, further facilitating rapid disconnection of the circuit breaker 10.

[0084] In one embodiment, the connection between the two bent portions 120 further includes a first groove 121 and a second groove 122. The opening of the first groove 121 faces away from the arc-quenching grid assembly 200. The opening of the second groove 122 faces the arc-quenching grid assembly 200 along the second direction Y. The provision of the two grooves reduces the thickness of the connection between the two bent portions 120, facilitating disconnection of the two bent portions 120.

[0085] In one embodiment, the depth of the second groove 122 is greater than the depth of the first groove 121, and the notch of the second groove 122 is away from the piston 300, so that when the piston 300 impacts the connection between the two bending parts 120 along the second direction Y, it is easier to disconnect the two bending parts 120.

[0086] Referring to Figures 4 and 6 , in one embodiment, when the circuit breaker 10 is closed, the thickness of the junction between the bent portion 120 and the conductive portion 110 along the second direction Y is less than the thickness of the conductive portion 110. The thickness of the conductive portion 110 may be its maximum thickness. The thickness of the junction between the bent portion 120 and the conductive portion 110 is d3 in Figure 6 , while the thickness of the conductive portion 110 is d4 in Figure 6 . When the circuit breaker 10 is open, the bent portion 120 is more easily bent relative to the conductive portion 110, allowing the ends 101 of the two bent portions 120 to approach the arc-quenching grid assembly 200, thereby facilitating the arc extinguishing by the arc-quenching grid assembly 200.

[0087] 4 and 6 , in one embodiment, the connection between the bent portion 120 and the conductive portion 110 includes a notch 123 , with the opening of the notch 123 facing away from the arc-quenching grid assembly 200 along the second direction Y. The provision of the notch 123 reduces the thickness of the connection between the bent portion 120 and the conductive portion 110 . The opening of the notch 123 faces the piston 300 . This allows the bent portion 120 to more easily bend around the connection between the bent portion 120 and the conductive portion 110 when the piston 300 impacts the connection between the two bent portions 120 along the second direction Y, thereby breaking the connection. This facilitates the arc-quenching grid assembly 200 in extinguishing the arc generated when the two ends 101 are disconnected.

[0088] Referring to Figures 4 and 5 , in one embodiment, along the first direction X, the distance between the two conductive portions 110 is less than or equal to the distance between the two arc-quenching grid assemblies 200. This greater distance between the two arc-quenching grid assemblies 200 facilitates arc cooling and extinguishing within the two arc-quenching grid assemblies 200. This also prevents the piston 300 from damaging the arc-quenching grids due to excessive impact force when the circuit breaker 10 is tripped, thereby improving the utilization of the two arc-quenching grid assemblies 200.

[0089] Referring to Figures 4 and 5 , in one embodiment, when the circuit breaker 10 is closed, along the first direction X, the sum of the lengths of the two bent portions 120 is greater than or equal to the distance between the two conducting portions 110. The greater length of the two bent portions 120 facilitates connection of the two conducting portions 110 via the two bent portions 120 when the circuit breaker 10 is closed.

[0090] Referring to Figures 4 and 5 , in one embodiment, the circuit breaker 10 further comprises two arc-starting pieces 220. The two arc-starting pieces 220 are arranged along a first direction X and are positioned between one of the through-current bars 100 and one of the arc-quenching grid groups 200, and between the other through-current bar 100 and the other of the arc-quenching grid groups 200. The two arc-starting pieces 220 are respectively connected to the two conducting portions 110. When the circuit breaker 10 is disconnected, the two ends 101 abut the adjacent ends of the two arc-starting pieces 220. Along the second direction Y, one of the two arc-starting pieces 220 is positioned between the through-current bar 100a and the arc-quenching grid group 200a, and the other arc-starting piece 220 is positioned between the through-current bar 100b and the arc-quenching grid group 200b.

[0091] The two arc-striking pieces 220 can be fixed to the two conductive parts 110 respectively by means of bolts, screws, pins, clips, etc. The arc-striking pieces 220 are connected to the conductive parts 110 so that the arc-striking pieces 220 and the conductive parts 110 are set at the same potential. When the circuit breaker 10 is disconnected, the two end portions 101 respectively abut against the two arc-striking pieces 220, so that the arc generated when the two end portions 101 are disconnected can be divided into two arc segments by the two arc-striking pieces 220. Since the arc-striking pieces 220 and the conductive parts 110 are at the same potential, the arc is more easily drawn into the arc-striking pieces 220. The two arc segments enter the two sets of arc extinguishing grids 200 and are extinguished respectively, which is conducive to the rapid cooling and extinguishing of the arc, thereby improving the breaking capacity of the circuit breaker 10. Moreover, due to the enhanced arc extinguishing capability of the circuit breaker 10, the circuit breaker 10 can achieve arc extinguishing at a higher voltage.

[0092] Referring to Figures 4 and 5 , in one embodiment, each arc-striking piece 220 includes a main body portion 221 and an arc-striking segment 222 that are connected and intersecting. The two arc-striking segments 222 of the two arc-striking pieces 220 are located between the two main bodies 221. The main body portion 221 is connected to the conductive portion 110, and the arc-striking segment 222 bends from the main body portion 221 in a direction away from the current bar 100. The distance between the main body portion 221 and the conductive portion 110 along the second direction Y is less than the length of the bent portion 120. When the circuit breaker 10 is disconnected, the end 101 of the bent portion 120 abuts the arc-striking segment 222.

[0093] The length of the bent portion 120 refers to the length of the bent portion 120 along the first direction X when the circuit breaker is closed. The distance between the main body 221 and the conducting portion 110 along the second direction Y is relatively small. By providing the arc-striking section 222, when the circuit breaker 10 is opened, the end 101 of the bent portion 120 can smoothly contact the arc-striking section 222, thereby making it easier for the arc to be drawn into the arc-striking piece 220.

[0094] Referring to Figures 4 and 5 , in one embodiment, the projection of the arc-starting segment 222 and the projection of the arc-quenching grid assembly 200 at least partially overlap along the first direction X. When the circuit breaker 10 is disconnected, the projection of the arc-starting segment 222 and the projection of the bent portion 120 at least partially overlap along the first direction X, and the projection of the arc-quenching grid assembly 200 and the projection of the bent portion 120 at least partially overlap. At least a portion of the bent portion 120 and at least a portion of the arc-starting segment 222 extend into the gap between the two sets of arc-quenching grid assemblies 200.

[0095] In the embodiment of the present application, due to the relatively long length of the bent portion 120, when the circuit breaker 10 is disconnected, if the arc-striking segment 222 is not provided, the distance between the arc-striking piece 220 and the conducting portion 110 needs to be relatively large in order for the end portion 101 to abut against the arc-striking piece 220. However, in the present application, by providing the arc-striking segment 222 that bends toward the arc-extinguishing grid assembly 200, the distance between the main body 221 and the conducting portion 110 is reduced, and the end portion 101 can still abut against the arc-striking segment 222, thereby facilitating a reduction in the size of the circuit breaker 10 along the second direction Y.

[0096] On the other hand, the provision of the arc-starting plate 220 can fully utilize the space between the end portion 101 and the conductive portion 110 to arrange more arc-quenching grids, which is beneficial for extinguishing the arc. Generally, to extend the arc's motion path and improve arc extinguishing effectiveness, the arc typically enters the arc-quenching grid group from the first arc-quenching grid in the arc-quenching grid group. The first arc-quenching grid is the arc-quenching grid closest to the conductive portion 110 in the second direction Y. If the arc-starting plate 220 is not provided, the distance between the arc-quenching grid group 200 and the conductive portion 110 along the second direction Y must be increased to ensure that the end portion 101 is closest to the first arc-quenching grid when the circuit breaker is opened. In the present application, since the arc is introduced into the arc-striking plate 220, the main body 221 of the arc-striking plate 220 is located between the first arc-extinguishing grid and the conductive portion 110, so that the distance between the arc-extinguishing grid group 200 and the main body 221 is relatively close, and the arc can be introduced into the first arc-extinguishing grid to achieve a better arc extinguishing effect.

[0097] In the embodiment of the present application, the conducting portion 110, the arc-striking plate 220, and the arc-extinguishing grid group 200 are arranged compactly, which is not only conducive to reducing the size of the circuit breaker 10 along the second direction Y, but also allows more arc-extinguishing grids to be arranged in a smaller space, so that the circuit breaker 10 can achieve higher voltage AC or DC arc extinguishing.

[0098] In one embodiment, when the circuit breaker 10 is disconnected, the angle between the bent portion 120 and the first direction X is greater than the angle between the arc-starting section 222 and the first direction X. Along the first direction X, the minimum distance between the two arc-starting sections 222 is greater than or equal to the distance between the two conducting portions 110. This facilitates the ends 101 of the two bent portions 120 to abut against the two arc-starting sections 222 when the circuit breaker 10 is disconnected. The angle between the bent portion 120 and the first direction X refers to the minimum angle formed between the ends 101 and the first direction X. The angle between the arc-starting section 222 and the first direction X also refers to the minimum angle formed between the arc-starting section 222 and the first direction X. The minimum distance between the two arc-starting sections 222 also refers to the distance between the two adjacent ends of the arc-starting sections 222.

[0099] 5 , in one embodiment, when the circuit breaker 10 is disconnected, the angle between the bent portion 120 and the first direction X is 90 degrees. That is, when the circuit breaker 10 is switched from the closed state to the open state, the bent portion 120 is bent 90 degrees.

[0100] 7 , in one embodiment, the circuit breaker 10 further includes two arcuate protrusion fixing members 231 . The two arcuate protrusion fixing members 231 are arranged along a third direction Z and are respectively used to fix the ends of the arcuate protrusion 210 along the third direction Z. The third direction Z is perpendicular to the first direction X and the second direction Y.

[0101] Referring to Figure 7 , in one embodiment, the circuit breaker 10 further includes two arc grid fixtures 232 , which are arranged along a third direction Z. The arc grid fixtures 232 are defined by a plurality of openings 233 extending through the arc grid fixtures 232 along the third direction Z. Each arc grid has protrusions 234 at both ends along the third direction Z. The protrusions 234 are inserted into the openings 233 to secure the arc grid. The arc grids in the two arc grid assemblies 200 can be secured to the same arc grid fixture 232.

[0102] Referring to FIG8 , in one embodiment, one arc-quenching grid in the two arc-quenching grid assemblies 200 may also be connected via a flat plate 212. That is, the two arc-quenching grids in the two arc-quenching grid assemblies 200 that are farthest from the through-current bar 100 pass through the flat plate 212, and the flat plate 212 is coplanar with the two arc-quenching grids in the two arc-quenching grid assemblies 200 that are farthest from the through-current bar 100.

[0103] Referring to Figures 9 and 10 , in one embodiment, the circuit breaker 10 further includes an arc extinguishing chamber housing 410. Two arc quenching grid assemblies 200 and at least a portion of two through-current bars 100 are housed within the arc quenching chamber housing 410 (see Figures 4 and 5 ). The arc quenching chamber housing 410 includes two side panels 401 disposed opposite each other along a first direction X. The side panels 401 include through holes 411 extending through the side panels 401 along the first direction. The arc quenching grids are parallel to the first direction X, and are arranged in intervals along a second direction Y. The through holes 411 connect the gaps between two adjacent arc quenching grids in one arc quenching grid assembly 200.

[0104] The two bent sections 120 of the two through-current bars 100 are located within the arc-extinguishing chamber housing 410. The two conductive portions 110 of the two through-current bars 100 are partially located within the arc-extinguishing chamber housing 410, with the remaining portions extending through the two side plates 401 and out of the arc-extinguishing chamber housing 410. The two sets of arc-quenching grid assemblies 200, the two arc-starting plates 220, and the arc-shaped protrusions 210 are all located within the arc-quenching chamber housing 410. The two side plates 401 are designated as side plates 401a and side plates 401b, respectively. Along the first direction X, side plates 401a, arc-quenching grid assemblies 200a, arc-quenching grid assemblies 200b, and side plates 401b are arranged in this order.

[0105] In the embodiment of the present application, both side panels 401a and 401b include through-holes 411. When the circuit breaker 10 is disconnected, the high-temperature, high-pressure gas generated by the arc can flow toward the side panel 401a through the gap between two adjacent arc-quenching grids in the arc-quenching grid assembly 200a and be discharged from the through-holes 411 on the side panel 401a to the outside of the arc-quenching chamber housing 410. Similarly, the high-temperature, high-pressure gas generated by the arc can also flow toward the side panel 401b through the gap between two adjacent arc-quenching grids in the arc-quenching grid assembly 200b and be discharged from the through-holes 411 on the side panel 401b to the outside of the arc-quenching chamber housing 410. When the fault current is interrupted, the provision of through-holes 411 facilitates the rapid entry of the arc into the arc-quenching grid assembly 200 and cools the high-temperature gas generated by the arc.

[0106] In one embodiment, the arc extinguishing chamber housing 410 includes two sub-housings connected along the third direction Z. By providing two detachable sub-housings, the assembly and disassembly of the circuit breaker 10 are facilitated.

[0107] With reference to Figures 4 and 9 , in one embodiment, the arc extinguishing chamber housing 410 further includes a top plate 402 and a bottom plate 403 disposed opposite each other along a second direction. Along the second direction Y, the top plate 402, two through-current bars 100, two sets of arc-quenching grid assemblies 200, and the bottom plate 403 are arranged in sequence. Along the second direction Y, the distance between the through-current bar 100 and the top plate 402 is smaller than the distance between the through-current bar 100 and the bottom plate 403. An arc extinguishing chamber is formed between the through-current bar 100 and the bottom plate 403. When the circuit breaker 10 is disconnected, the bent portions 120 enter the arc extinguishing chamber, and the arc formed by the disconnection of the bent portions 120 is extinguished within the arc extinguishing chamber by the two sets of arc-quenching grid assemblies 200.

[0108] 4 and 9 , the top plate 402 is further defined with a mounting hole 412. The mounting hole 410 extends through the top plate 402 along the second direction Y. The circuit breaker 10 also includes an ignition chamber housing 420, which is secured to the top plate 402 along the second direction Y. The ignition element and a portion of the piston 300 are located within the ignition chamber housing 420, while the remaining portion of the piston 300 extends through the mounting hole 410 into the arc extinguishing chamber housing 410. In the present application, the circuit breaker 10 includes a detachably connected arc extinguishing chamber housing 410 and an ignition chamber housing 420, facilitating assembly of the circuit breaker 10 and recycling of its components.

[0109] Referring to Figure 11 , in one embodiment, the arc-quenching grids intersect the first direction, and multiple arc-quenching grids are spaced apart and arranged perpendicular to the arc-quenching grids. In arc-quenching grid assembly 200a, the distance between the arc-quenching grids and the flow bar 100a decreases along the second direction Y, from side plate 401a to side plate 401b along the first direction X. Similarly, in arc-quenching grid assembly 200b, the distance between the arc-quenching grids and the flow bar 100b decreases along the second direction Y, from side plate 401b to side plate 401a along the first direction X. The inclined arrangement of the arc-quenching grids facilitates the discharge of high-temperature airflow generated by the arc.

[0110] Referring to FIG. 12 in conjunction with FIG. 4 , in one embodiment, the circuit breaker 10 includes multiple arc extinguishing chamber housings 410 connected along a third direction Z. Each arc extinguishing chamber housing 410 houses two through-current bars 100 and two sets of arc quenching grid assemblies 200. The third direction Z is perpendicular to the first direction X and the second direction Y. The circuit breaker 10 is a multi-stage circuit breaker, and the multiple stages are isolated by the arc extinguishing chamber housings 410, thereby improving isolation between the multiple stages.

[0111] The multiple arc extinguishing chamber housings 410 can be an integrated structure to enhance the overall strength of the multiple arc extinguishing chamber housings 410. The arc extinguishing chamber housings 410 include a front plate and a rear plate disposed opposite each other along the third direction Z. Two adjacent arc extinguishing chamber housings 410 can also share the same front plate or rear plate to reduce the size of the circuit breaker 10 along the third direction Z and save costs.

[0112] Please refer to Figure 12 in combination with Figure 4. In one embodiment, the circuit breaker 10 includes a plurality of ignition chamber shells 420 connected along the third direction Z. The plurality of ignition chamber shells 420 are respectively fixed to the plurality of arc extinguishing chamber shells 410. Each ignition chamber shell 420 houses an ignition element and a piston 300. In the circuit breaker 10, each level of circuit breaker 10 is independently provided and can independently control the disconnection of different circuits. The plurality of ignition chamber shells 420 can be an integrated structure to enhance the overall strength of the plurality of ignition chamber shells 420. The ignition chamber shell 420 includes a front plate and a rear plate that are relatively arranged along the third direction Z. Two adjacent ignition chamber shells 420 can also share the same front plate or rear plate to reduce the size of the circuit breaker 10 along the third direction Z and save costs.

[0113] In one embodiment, multiple ignition chamber housings 420 are interconnected along a third direction Z. Each of the multiple ignition chamber housings 420 contains only one ignition element and one piston 300. Each ignition element and one piston 300 are located within each of the multiple ignition chamber housings 420. When the ignition element receives an ignition signal, it generates a driving force that pushes the piston 300. The piston 300 moves along a second direction Y to simultaneously disconnect two through-current bars 100 within different arc extinguishing chamber housings 410. This makes it more convenient to control the disconnection of multiple lines using the circuit breaker 10.

[0114] The above is a detailed introduction to the circuit breaker, photovoltaic inverter system and electric vehicle provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A circuit breaker, characterized in that: The circuit breaker comprises: Two through-flow rows, wherein the two through-flow rows are arranged along a first direction; Two groups of arc-extinguishing grid groups, the two groups of arc-extinguishing grid groups are arranged at intervals along the first direction, the two groups of arc-extinguishing grid groups are respectively arranged with the two through-current bars along a second direction, the second direction is perpendicular to the first direction, each group of the arc-extinguishing grid groups includes a plurality of arc-extinguishing grids, each group of the arc-extinguishing grid groups includes one arc-extinguishing grid, along the second direction, the distance between the one arc-extinguishing grid and the through-current bar is the maximum distance between the one group of arc-extinguishing grid groups and the through-current bar, and the one arc-extinguishing grid in one group of the arc-extinguishing grid groups is connected to the one arc-extinguishing grid in another group of the arc-extinguishing grid groups; When the circuit breaker is closed, the two current bars are connected; when the circuit breaker is opened, the ends of the two current bars approaching each other along the first direction are respectively bent toward the two groups of arc-extinguishing grid plates, so that the two current bars are disconnected and an arc is formed, and the two groups of arc-extinguishing grid plates are used to extinguish the arc.

2. The circuit breaker according to claim 1, characterized in that: The circuit breaker further comprises an arc-shaped protrusion, wherein the arc-shaped protrusion is used to connect the one arc-extinguishing grid in the two groups of arc-extinguishing grids; Along the first direction, the arc-shaped convex portion and the projections of the two groups of arc-extinguishing grids at least partially overlap, and along the second direction, the distance between the arc-shaped convex portion and the through-current bar is smaller than the distance between the one arc-extinguishing grid and the through-current bar.

3. The circuit breaker according to claim 2, characterized in that: When the circuit breaker is disconnected, the distance between the end and the arc-shaped protrusion is greater than or equal to half of the distance between the two ends and less than or equal to twice the distance between the two ends.

4. The circuit breaker according to claim 1, characterized in that: Each of the through-current bars comprises a conducting portion and a bent portion connected to each other, the two bent portions of the two through-current bars are located between the two conducting portions, and the end portion is an end of the bent portion away from the conducting portion; When the circuit breaker is closed, along the second direction, the thickness of the connection between the two bent portions is smaller than the thickness of the bent portions, and the thickness of the connection between the bent portion and the conductive portion is smaller than the thickness of the conductive portion; when the circuit breaker is opened, the bent portion is bent relative to the conductive portion so that the ends of the two bent portions are separated.

5. The circuit breaker according to claim 4, characterized in that: Along the first direction, the distance between the two conducting portions is less than or equal to the distance between the two groups of arc-extinguishing grid plates; When the circuit breaker is closed, along the first direction, the sum of the lengths of the two bent portions is greater than or equal to the distance between the two conducting portions.

6. The circuit breaker according to claim 4, characterized in that: The circuit breaker further comprises two arc-striking plates, the two arc-striking plates are arranged along the first direction, and the two arc-striking plates are respectively located between one of the through-current bars and one of the arc-extinguishing grid groups, and between another of the through-current bars and another of the arc-extinguishing grid groups; The two arc-striking pieces are respectively connected to the two conducting parts, and when the circuit breaker is disconnected, the two end portions are respectively abutted against one end of the two arc-striking pieces that are close to each other.

7. The circuit breaker according to claim 6, characterized in that: Each of the arc-striking pieces comprises a main body portion and an arc-striking segment which are connected and intersected, the two arc-striking segments of the two arc-striking pieces are located between the two main bodies, the main body portion is connected to the conducting portion, and the arc-striking segment is bent from the main body portion toward a direction away from the through-current row; The distance between the main body and the conducting portion along the second direction is smaller than the length of the bent portion. When the circuit breaker is disconnected, the end of the bent portion abuts against the arc striking segment.

8. The circuit breaker according to claim 7, characterized in that: Along the first direction, the projection of the arc-starting segment and the projection of the arc-extinguishing grid group at least partially overlap; When the circuit breaker is disconnected, along the first direction, the projection of the arc striking segment and the projection of the bent portion at least partially overlap, and the projection of the arc extinguishing grid group and the projection of the bent portion at least partially overlap.

9. The circuit breaker according to claim 4, characterized in that: The circuit breaker further comprises an ignition element and a piston, wherein the ignition element, the piston, the two through-current bars and the two groups of arc-extinguishing grid plates are arranged along the second direction; The ignition element is used to generate a driving force for driving the piston to move along the second direction, and the piston is used to move along the second direction to disconnect the two flow bars so as to disconnect the circuit breaker.

10. The circuit breaker according to claim 9, characterized in that Along the first direction, the width of the piston is less than or equal to the distance between the two conducting parts; When the circuit breaker is disconnected, along the first direction, at least a portion of the piston is located between the two bent portions.

11. The circuit breaker according to claim 1, characterized in that: The circuit breaker further comprises an arc extinguishing chamber housing, wherein the two arc extinguishing grid groups and at least part of the two through-current bars are accommodated in the arc extinguishing chamber housing, and the arc extinguishing chamber housing comprises two side plates arranged opposite to each other along the first direction, and the side plates comprise through holes penetrating the side plates along the first direction; wherein: The arc-extinguishing grid is parallel to the first direction, and the plurality of arc-extinguishing grids are arranged at intervals along the second direction, or the arc-extinguishing grid intersects with the first direction, and the plurality of arc-extinguishing grids are arranged at intervals along a direction perpendicular to the arc-extinguishing grids, and the through hole communicates with a gap between two adjacent arc-extinguishing grids in a group of the arc-extinguishing grids.

12. A power converter, characterized in that: The DC input end of the power converter is used to connect to a photovoltaic module or an energy storage battery, and the AC output end of the power converter is used to connect to a power grid or a load; The power converter comprises a DC / AC conversion circuit and a circuit breaker according to any one of claims 1 to 11, wherein the circuit breaker is connected between the DC input terminal and the DC / AC conversion circuit, or the circuit breaker is connected between the DC / AC conversion circuit and the AC output terminal; When the current flowing through the two current bars of the circuit breaker is greater than a preset threshold, the two current bars are disconnected.

13. An energy storage system, characterized in that: The energy storage system comprises a plurality of battery packs connected in series and a circuit breaker according to any one of claims 1 to 11, wherein the circuit breaker is connected in a series circuit of the plurality of battery packs; When the current flowing through the two current bars of the circuit breaker is greater than a preset threshold, the two current bars are disconnected.

14. An electric vehicle, characterized in that: The invention comprises a battery cluster, an inverter circuit, a motor and a circuit breaker according to any one of claims 1 to 11, wherein the battery cluster is used to output direct current, and the inverter circuit converts the direct current into three-phase alternating current and transmits the three-phase alternating current to the motor; The circuit breaker is connected between the battery cluster and the DC end of the inverter circuit, or the circuit breaker is connected between the AC end of the inverter circuit and the motor; When the current flowing through the two current bars of the circuit breaker is greater than a preset threshold, the two current bars are disconnected.

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