Breaker, power distribution equipment and vehicle

Abstract

The invention discloses a breaker, power distribution equipment and a vehicle, and relates to the technical field of breakers, and the breaker comprises a pedestal which is provided with an arc extinguishing cavity; the sealing cover is arranged on one side of the opening of the arc extinguishing cavity, the sealing cover is provided with a first channel penetrating through the thickness direction of the sealing cover, and the first channel is communicated with the opening of the arc extinguishing cavity; the through-flow copper bar and the sealing cover are arranged in parallel, the through-flow copper bar penetrates through the sealing cover in the direction perpendicular to the thickness of the sealing cover, a sealing structure in which a boss is matched with a clamping groove is formed between the sealing cover and the through-flow copper bar, the part, located in the first channel, of the through-flow copper bar comprises a thinned part, and the thickness of the thinned part is smaller than that of other parts of the through-flow copper bar; and at least part of the piston is contained in the first channel, and the projection of the piston in the thickness direction of the sealing cover at least partially coincides with the thinned part. According to the breaker provided by the invention, the sealing structure in which the boss is matched with the clamping groove is formed between the sealing cover and the through-flow copper bar, so that the air tightness of the breaker can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to a circuit breaker, a power distribution device and a vehicle. Background Art

[0002] A breaker is an electronic component used to connect or disconnect the current in one or more circuits. The breaker can be used in power systems to protect the safe operation of the power system. When a circuit breaker fails such as overload or short circuit, the breaker can automatically switch to the disconnected state to disconnect the current in the circuit, thereby playing a protective role. A piston is set in the breaker. When the current is abnormal, it will trigger the high-speed movement of the piston, causing the piston to break the copper bar to cut off the circuit. When the copper bar breaks, an arc and high-temperature free gas will be generated at the break.

[0003] When the piston breaks through the current copper bar and enters the arc extinguishing chamber, if the air tightness between the current copper bar and the sealing cover is poor, the high-temperature free gas in the arc extinguishing chamber will diffuse to the current copper bar. The free electrons and ions in the gas will increase the conductivity between the broken current copper bars, thereby reducing the insulation performance between the broken current copper bars, causing the voltage to break through the broken ends of the current copper bars, ultimately causing damage to the breaker or even failure of the entire power system. Summary of the invention

[0004] The present application provides a circuit breaker, a power distribution device and a vehicle, which can improve the air tightness of the circuit breaker.

[0005] In a first aspect, the present application provides a circuit breaker, comprising: a base, having an arc extinguishing chamber; a sealing cover, arranged on one side of the opening of the arc extinguishing chamber, the sealing cover having a first channel penetrating the sealing cover in the thickness direction, the first channel being communicated with the opening of the arc extinguishing chamber; a current busbar, the current busbar being arranged in parallel with the sealing cover, and the current busbar passing through the sealing cover in a direction perpendicular to the thickness of the sealing cover, a sealing structure of boss and slot matching being formed between the sealing cover and the current busbar, the portion of the current busbar located in the first channel comprising a thinning portion, the thickness of the thinning portion being less than the thickness of other portions of the current busbar; a piston, at least partially accommodated in the first channel, and the projection of the piston along the thickness direction of the sealing cover at least partially overlaps with the thinning portion.

[0006] The sealing structure provided by the present application is formed between the sealing cover and the copper busbar, in which a boss and a slot are matched, and the boss can be located in the slot, so that the first contact surface of the sealing cover and the second contact surface of the copper busbar can be sealed and fitted. The sealing connection between the boss and the slot can achieve a better seal between the copper busbar and the sealing cover. The copper busbar and the sealing cover in the present application have good air tightness, which can prevent the high-temperature free gas in the arc extinguishing chamber from diffusing to the copper busbar, thereby facilitating the breaker to quickly cut off the current and protect the safe operation of the power system.

[0007] In a possible implementation, the slot is located on the side of the copper busbar facing away from the base, and the boss is arranged on the sealing cover and extends from the side of the copper busbar facing away from the base into the slot. The copper busbar includes a connecting portion and a bending portion, and the surface of the bending portion in the opposite direction of Z and the surface of the connecting portion in the opposite direction of Z are located in the same plane, and the portion of the bending portion located in the first channel is a thinning portion, and the thickness of the thinning portion is less than the thickness of the connecting portion, so that a slot is formed between the thinning portion and the connecting portion, and the slot is located on the side of the thinning portion in the positive direction of Z, and the boss is located on the sealing cover and extends into the slot in the opposite direction of Z. The sealing cover and the copper busbar are fixedly connected by the cooperation of the boss and the slot, and the air tightness can also be enhanced.

[0008] In a possible implementation, the boss includes a first through hole, the first through hole is connected to the first channel, and the projection of the first through hole along the thickness direction of the sealing cover and the thinned portion at least partially overlap. The piston is accommodated in the first channel, the through-current copper bar is accommodated in the sealing cover, and the piston can pass through the boss through the first through hole and break through the thinned portion of the through-current copper bar to enter the arc extinguishing chamber.

[0009] In a possible implementation, the edge of the first through hole is fitted and connected to the outer wall surface of the piston. When the piston breaks through the copper bar and enters the arc extinguishing chamber, the piston will plug the first through hole, and the edge of the first through hole can be fitted and connected to the outer wall surface of the piston. Under this design, a good seal can be ensured between the piston and the first through hole. When the copper bar is broken by the piston, the high-temperature free gas in the arc extinguishing chamber can be prevented from flowing in the positive direction Z, thereby improving the insulation performance of the copper bar and preventing voltage breakdown between the broken copper bars. At the same time, it is also convenient for the piston to move relative to the first through hole, reducing the friction between the piston and the edge of the first through hole.

[0010] In a possible implementation, the sealing cover includes a sealing upper cover and a sealing lower cover, the sealing upper cover, the sealing lower cover and the base are connected in sequence, and a receiving groove is provided between the sealing upper cover and the sealing lower cover, and the receiving groove is used to enclose the through-flow copper bar. The receiving groove can be used to accommodate part of the through-flow copper bar, and when the sealing upper cover and the sealing lower cover are buckled, the through-flow copper bar is located between the sealing upper cover and the sealing lower cover, and part of the through-flow copper bar is located in the receiving groove, so that the sealing upper cover and the sealing lower cover can enclose the through-flow copper bar and fix the through-flow copper bar in the sealing cover.

[0011] In a possible implementation, the sealing upper cover is provided with a first convex rib, the sealing lower cover is provided with a first groove, and / or the sealing lower cover is provided with a first convex rib, and the sealing upper cover is provided with a first groove; the first convex rib is plugged into the first groove, and the first convex rib is located on both sides of the through-flow copper bar. After the first convex rib is plugged into the first groove, the first convex rib is located in the first groove and is fitted and connected to the inner wall of the first groove. The first convex rib can cooperate with the first groove so that the sealing upper cover and the sealing lower cover can be buckled and connected together. The first convex rib is located on both sides of the through-flow copper bar, and both ends of the first convex rib are fitted and connected to the through-flow copper bar. The first convex rib can limit the through-flow copper bar to prevent the through-flow copper bar from moving relative to the sealing cover.

[0012] In a possible implementation, the sealing upper cover is provided with a first through hole, and the sealing lower cover is provided with a second through hole, the first through hole and the second through hole are connected to form part of the first channel, and there is a spacing space between the edges of the first through hole and the second through hole and the copper busbar on one side or both sides along the width direction of the copper busbar. The first through hole can be connected to the second through hole, and the first through hole and the second through hole can form part of the first channel. After the piston breaks the copper busbar, it will pass through the first through hole and the second through hole in sequence and then enter the arc extinguishing chamber. The first through hole, the spacing space and the second through hole are connected in sequence, and an arc will be generated after the copper busbar is broken, and the arc will propagate along the edge of the spacing space. The distance between the broken copper busbars along the edge of the spacing space is the creepage distance. The setting of the spacing space can effectively prevent arc discharge and improve the safety and reliability of the circuit breaker.

[0013] In a possible implementation, along the extension direction of the through-current copper busbar, the length of the portion where the second through hole overlaps with the projection of the through-current copper busbar along the thickness direction of the sealing cover is greater than the length of the portion where the first through hole overlaps with the projection of the through-current copper busbar along the thickness direction of the sealing cover. Under this design, the opening area of ​​the second through hole is greater than the opening area of ​​the first through hole. The second through hole is located on the Z-opposite side of the first through hole, and the opening area of ​​the second through hole is greater than the opening area of ​​the first through hole. The larger opening area makes the gas have less resistance during normal flow, but needs to overcome greater airflow resistance during backflow. When the high-temperature free gas in the arc extinguishing chamber attempts to flow back from the arc extinguishing chamber to the sealing upper cover, due to the larger opening area of ​​the second through hole, the gas will encounter greater resistance when trying to flow back, thereby preventing the high-temperature free gas in the arc extinguishing chamber from flowing back to the sealing upper cover.

[0014] In a possible implementation, the copper bar is provided with a bending groove on the side facing the base, and the projection of the bending groove falls entirely within the projection of the second through hole along the thickness direction of the sealing cover. When the piston breaks through the copper bar, the outer wall surface of the piston will squeeze the copper bar, causing the copper bar to bend and deform. The bending groove can increase the deformation capacity of the copper bar at the bending portion. When the piston squeezes the copper bar, the presence of the bending groove makes it easier for the copper bar to bend and deform along the bending groove. The projection of the bending groove in the Z direction all falls within the projection of the second through hole, so that the bent copper bar does not interfere with the sealing lower cover, making it easier for the piston to break through the copper bar to cut off the current.

[0015] In a possible implementation, the first channel includes a first sub-channel and a second sub-channel, the first sub-channel is located on the side of the through-current copper bar away from the base, and the second sub-channel is located on the side of the through-current copper bar close to the base; along the extension direction of the through-current copper bar, the length of the second sub-channel in the thickness direction of the sealing cover and the overlapped portion of the projection of the through-current copper bar is greater than the length of the first sub-channel in the thickness direction of the sealing cover and the overlapped portion of the projection of the through-current copper bar. Under this design, the opening area of ​​the second sub-channel is greater than the opening area of ​​the first sub-channel, and the larger opening area makes the gas have less resistance during normal flow, but needs to overcome greater airflow resistance during backflow. When the high-temperature free gas in the arc extinguishing chamber attempts to flow back from the arc extinguishing chamber to the sealing upper cover, due to the larger opening area of ​​the second sub-channel, the gas will encounter greater resistance when trying to flow back, thereby preventing the high-temperature free gas in the arc extinguishing chamber from flowing back to the side of the sealing cover in the positive Z direction.

[0016] In a possible implementation, a spacing space is provided between the side wall of the first channel and the current copper bar on one side or both sides of the current copper bar along its width direction. When the current copper bar is broken, an arc is generated, and the arc propagates along the edge of the spacing space. The distance between the broken current copper bars along the edge of the spacing space is the creepage distance. The provision of the spacing space can effectively prevent arc discharge and improve the safety and reliability of the circuit breaker.

[0017] In a possible implementation, the depth of the card slot and the thickness of the copper busbar are in the range of 0.3 to 0.7. The depth of the card slot and the thickness of the copper busbar are in the range of 0.3 to 0.7, which can ensure that the copper busbar is sealed and connected to the sealing cover through the card slot and the boss, and can also ensure that current can flow through the copper busbar and connect the circuit.

[0018] In a possible implementation, the copper bar has a fracture, and the piston is provided with a tip on the side facing the base, and the projections of the tip and the fracture coincide with each other along the extension direction of the first channel. The fracture can reduce the thickness of the bent portion, thereby facilitating the piston to break the copper bar. The piston is provided with a tip on the side facing the base. The fracture is located directly below the tip in the Z direction, and in the Z direction, the projections of the tip and the fracture coincide with each other. When the piston moves in the opposite direction to the Z direction, the tip of the piston is inserted into the fracture, and the copper bar is broken at the fracture.

[0019] In a possible implementation, the number of the fracture openings is one, and the fracture opening is located on one side of the copper bar along the thickness direction of the sealing cover; or the number of the fracture openings is two, and the two fracture openings are respectively located on both sides of the copper bar along the thickness direction of the sealing cover, and the projections of the two fracture openings along the thickness direction of the sealing cover at least partially overlap. The fracture opening can reduce the thickness of the bent portion, thereby facilitating the piston to break the copper bar. The two fracture openings can further reduce the thickness of the bent portion, making it easier for the copper bar to be broken by the piston.

[0020] In a possible implementation, the breaker further includes a top cover, the top cover is located on the side of the sealing cover away from the base; the sealing cover is provided with a second rib, the top cover is provided with a second groove, and / or the sealing cover is provided with a second groove, the top cover is provided with a second rib; the second rib is arranged around the periphery of the opening edge of the first channel; the second rib is located in the second groove. Under this design, it can be ensured that even if the gas in the arc extinguishing chamber leaks from the first channel, it will not leak from between the top cover and the sealing cover, which can further improve the air tightness of the breaker.

[0021] In a possible implementation, the sealing cover has a third rib, the base is provided with a third groove, and / or the sealing cover is provided with a third groove, the base is provided with a third rib; the third rib is provided around the periphery of the opening edge of the first channel; the third rib is located in the third groove. Under this design, it can be ensured that even if the gas in the arc extinguishing chamber leaks from the first channel, it will not leak from between the base and the sealing cover, which can further improve the air tightness of the circuit breaker.

[0022] In a possible implementation, the number of the arc extinguishing chambers is at least two, the sealing cover is provided with a fourth rib, the base is provided with a fourth groove, and / or the sealing cover is provided with a fourth groove, the base is provided with the fourth rib; both ends of the fourth rib are connected to the third rib, the fourth groove and / or the fourth rib are located between two adjacent arc extinguishing chambers, and the fourth rib is located in the fourth groove and is closely connected to the inner wall of the fourth groove. The cooperation between the fourth rib and the fourth groove can isolate the two adjacent arc extinguishing chambers and prevent the gases in the two adjacent arc extinguishing chambers from penetrating each other.

[0023] In a possible implementation, at least one of the second convex rib, the third convex rib, and the fourth convex rib is provided with a mounting hole, and the mounting hole is used to pass a fastener, and the fastener is used to fix the sealing cover and the base. The mounting hole is provided on at least one of the second convex rib, the third convex rib, and the fourth convex rib, so that the base and the sealing cover can be sealed and the sealing cover and the base can be fixedly connected. The fastener can be hidden in the mounting hole, and the top cover, the sealing cover, the base and other structures with the mounting hole are all made of insulating structures such as plastic, and the inner wall of the mounting hole can insulate the fastener from the external conductive structure.

[0024] In a second aspect, the present application provides a power distribution device, comprising a connector and a breaker as described in any one of the first aspects above, wherein the connector is used to electrically connect a power source, and the breaker is electrically connected between the connector and the power source.

[0025] In a third aspect, the present application provides a vehicle, comprising a power source and the power distribution device described in the second aspect above, wherein the power source is electrically connected to the power distribution device, and the breaker is electrically connected between the connector and the power source. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of a photovoltaic energy storage system provided in an embodiment of the present application;

[0027] Figure 2 It is a schematic diagram of an energy storage system provided in an embodiment of the present application;

[0028] Figure 3is a schematic diagram of a vehicle energy storage system provided in an embodiment of the present application;

[0029] Figure 4 It is a schematic diagram of the structure explosion of the breaker provided in the embodiment of the present application;

[0030] Figure 5 It is a structural schematic diagram of a circuit breaker provided in an embodiment of the present application;

[0031] Figure 6 is a schematic top view of a circuit breaker provided in an embodiment of the present application;

[0032] Figure 7 yes Figure 6 Cross-sectional view at AA in the middle;

[0033] Figure 8 It is a schematic diagram of the structure of the through-current copper busbar provided in the embodiment of the present application;

[0034] Fig. 9 is a structural schematic diagram of a circuit breaker provided in another embodiment of the present application;

[0035] Fig.10 It is a schematic diagram of the structure explosion of a breaker provided in another embodiment of the present application;

[0036] Fig.11 It is a schematic diagram of the structure explosion of a breaker provided in another embodiment of the present application;

[0037] Fig.12 It is a schematic diagram of the structure of the sealing upper cover provided in the embodiment of the present application;

[0038] Fig.13 It is a schematic diagram of the structure of the sealing upper cover provided in the embodiment of the present application;

[0039] Fig.14 is a schematic structural diagram of a sealed lower cover provided in an embodiment of the present application;

[0040] Fig.15 is a schematic structural diagram of a sealed lower cover provided in an embodiment of the present application;

[0041] Fig.16 is a schematic top view of a sealed lower cover provided in an embodiment of the present application;

[0042] Fig.17 This is a schematic diagram of the structure of the sealing upper cover and the through-current copper busbar assembly provided in the embodiment of the present application;

[0043] Fig.18A It is a schematic top view of the assembly of the sealing upper cover and the through-current copper busbar provided in the embodiment of the present application;

[0044] Fig.18Byes Fig.18A The enlarged view of point A in the middle;

[0045] Fig.19 This is a schematic diagram of the structure of the assembly of the sealing lower cover and the through-current copper busbar provided in the embodiment of the present application;

[0046] Fig. 20A It is a schematic top view of the assembly of the sealing lower cover and the through-current copper busbar provided in an embodiment of the present application;

[0047] Fig. 20B yes Fig. 20A The enlarged view of point B in the middle;

[0048] Fig.21 It is a schematic diagram of the size between the first through hole and the second through hole provided in the embodiment of the present application;

[0049] Fig. 22 is a schematic diagram of the relationship between the bending groove and the position of the second through hole provided in an embodiment of the present application;

[0050] Fig.23 is a schematic diagram of the relationship between the bending groove and the position of the second through hole provided in another embodiment of the present application;

[0051] Fig.24 is a schematic diagram of the relationship between the bending groove and the position of the second through hole provided in another embodiment of the present application;

[0052] Fig.25 It is a schematic top view of the assembly of the sealing lower cover and the through-current copper busbar provided in an embodiment of the present application;

[0053] Fig.26 It is a schematic top view of the assembly of the sealing cover and the through-current copper busbar provided in the embodiment of the present application;

[0054] Fig. 27 It is a schematic side view of a through-current copper busbar provided in an embodiment of the present application;

[0055] Fig.28 It is a schematic diagram of the structure of the piston and the through-flow copper bar provided in the embodiment of the present application;

[0056] Fig.29 It is a schematic diagram of setting a fracture on a through-current copper busbar provided in an embodiment of the present application;

[0057] Fig.30 It is a schematic diagram of providing a fracture on a through-current copper busbar provided in another embodiment of the present application;

[0058] Fig.31 It is a schematic diagram of providing a fracture on a through-current copper busbar provided in another embodiment of the present application;

[0059] Fig.32 It is a structural schematic diagram of a circuit breaker provided in an embodiment of the present application;

[0060] Fig.33 It is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0062] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0063] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0064] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0065] It should be understood that the term "and / or" used in this article is only a description of the same field of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0066] It should be understood that the terms “first”, “second”, etc. used in the present application are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0067] In the description of the present application, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0068] When used in this application, “within the range of…”, unless it is separately specified that an end value is not included, it is assumed that both end values ​​of the range are included. For example, in the range of 1 to 5, the two values ​​1 and 5 are included.

[0069] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0070] A breaker is an electronic component used to connect or disconnect the current in one or more circuits. The breaker can be used in power systems to protect the safe operation of the power system. When a circuit fails such as an overload or short circuit, the breaker can automatically switch to the disconnected state to disconnect the current in the circuit, thereby playing a protective role. A piston is provided in the breaker. When the current is abnormal, it will trigger the high-speed movement of the piston, causing the piston to break the current copper bar to cut off the circuit. When the current copper bar breaks, an arc will be generated at the break. The arc is a gas discharge phenomenon that occurs when current passes through air or other insulating media. When the current copper bar breaks, the circuit is cut off, and the electric field strength between the broken current copper bars may be strong enough to ionize the molecules in the air into free electrons and ions, forming a conductive path, thereby generating an arc.

[0071] The generation of arcs prolongs the circuit breaking time, and the high temperature of the arcs can easily endanger the safe operation of the power system, causing casualties and significant property losses. In addition, when the piston breaks the copper bar and enters the arc extinguishing chamber, if the air tightness between the copper bar and the sealing cover is poor, the high-temperature free gas in the arc extinguishing chamber will diffuse to the copper bar, and the free electrons and ions in the gas will increase the conductivity between the broken copper bars, thereby reducing the insulation performance between the broken copper bars, causing the voltage to break between the broken copper bars, ultimately causing damage to the breaker or even failure of the entire power system.

[0072] To solve the above problems, the present application provides a breaker 10, which has high air tightness and can prevent gas leakage in the arc extinguishing chamber. The generated arc can be extinguished quickly, so that the breaker 10 can quickly cut off the circuit, including the safe operation of the power system.

[0073] The breaker 10 of the present application may be applied to an electric power system, which may include a power source and a load. One end of the breaker is connected to the power source, and the other end is connected to the load.

[0074] For example, the power system may include a photovoltaic inverter system, Figure 1 A schematic diagram of a photovoltaic energy storage system provided by an embodiment of the present application is shown. Figure 1As shown, the photovoltaic inverter system includes a photovoltaic (PV) panel and a photovoltaic inverter. The photovoltaic panel converts solar energy into electrical energy. Since the photovoltaic panel generates direct current, the photovoltaic inverter needs to convert the direct current into alternating current to facilitate the transmission and utilization of electricity.

[0075] The photovoltaic inverter includes a direct current to alternating current (DC / AC) converter, and the DC / AC converter is used to convert direct current into alternating current.

[0076] The photovoltaic inverter also includes a maximum power point tracking (MPPT) module. The MPPT device is used to track the highest voltage and current values ​​so that the power generation system outputs current at maximum power. The MPPT device and DC / DC module in the photovoltaic inverter can be set in the same package device or in different package devices.

[0077] The MPPT device may include a direct current to direct current (DC / DC) converter, which is used to stabilize the direct current generated by the PV module (or, 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 converter is connected to the MPPT device and an energy storage system, and the other end B is used to connect to the AC grid or AC load, so that the DC / AC converter converts the DC power output by the MPPT device or the energy storage system into AC power and provides it to the AC load or the AC grid.

[0078] In addition, the other end B of the DC / AC converter can also be connected to another energy storage system via an inverter (i.e., a DC / AC converter), which is used to convert the AC power from the photovoltaic inverter into DC power and store it in the energy storage system. In addition, the DC power from the energy storage system can be converted into AC power and provided to the AC load or AC grid.

[0079] like Figure 1 As shown, in one implementation, the breaker provided by the present application can be set in the circuit between the MPPT and the energy storage system and the DC / AC converter, that is, one end of the current-carrying bar of the breaker is connected to the MPPT and the energy storage system, and one end of the current-carrying bar of the breaker is connected to the DC / AC converter. In this case, the breaker works in a DC circuit. The breaker can be used to cut off the electrical connection between the MPPT and the DC / AC converter, and the breaker can be used to cut off the electrical connection between the energy storage system and the DC / AC converter.

[0080] In another implementation, the breaker provided by the present application can be arranged between the DC / AC converter and the output interface of the photovoltaic system, that is, the breaker can cut off the electrical connection between the DC / AC converter and the AC load or the AC grid, that is, one end of the current-carrying bar of the breaker is connected to the DC / AC converter, and one end of the current-carrying bar of the breaker is connected to the grid or the load. In this case, the breaker works in the AC circuit. The breaker can be used to cut off the electrical connection between the photovoltaic system and the AC load or the AC grid.

[0081] The breaker provided in the present application may also be provided in the above-mentioned photovoltaic inverter. In this case, the photovoltaic inverter includes the above-mentioned DC / AC converter, the MPPT device, the detection circuit, the breaker and the controller.

[0082] The input end of the MPPT device is used to connect to the photovoltaic module, and the output end of the MPPT device is used to directly or indirectly connect to the input end of the DC / AC converter.

[0083] For example, the breaker is connected between the output end of the MPPT device and the input end of the DC / AC converter.

[0084] Alternatively, the breaker is connected between the output end of the DC / AC converter and an external power grid or load.

[0085] The detection circuit is used to detect electrical parameters of the DC / AC converter, for example, the electrical parameters include at least one of the input terminal voltage of the DC / AC converter, the input terminal current of the DC / AC converter, the output terminal voltage of the DC / AC converter, and the output terminal current of the DC / AC converter.

[0086] The controller is used to control the motor mechanism of the breaker to drive the piston to move when the electrical parameter of the DC / AC converter exceeds a preset threshold value, so that the first insulating part cuts off the current bar, so as to disconnect the electrical connection between the output end of the MPPT device and the input end of the DC / AC converter, or disconnect the output end of the DC / AC converter and the external power grid or load. The structure of the breaker and the actions of each part after the breaker is started are described in detail.

[0087] For example, the power system may include an energy storage system, Figure 2 Schematic diagram of the energy storage system provided by the embodiment of the present application is shown. Figure 2As shown, the energy storage system includes one or more battery clusters, each battery cluster includes one or more battery packs, the battery cluster includes an input and output interface, the input and output interface 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 energy storage system also includes a breaker provided by the present application, the breaker 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 which case, the breaker works in the DC circuit. The breaker can be used to cut off the electrical connection between the energy storage system and the DC load or the photovoltaic inverter system.

[0088] In addition, although not shown in the figure, the energy storage system may also include one or more DC / DC converters and one or more battery management systems (BMS). Each battery pack corresponds to a BMS. BMS is usually used to implement dynamic monitoring of battery charging and discharging, battery balancing, and evaluation of battery charge state, and the DC / DC converter is used for power conversion included in the battery.

[0089] The battery pack may be a single battery or a battery cluster consisting of multiple batteries. Specifically, the battery may be a combination of one or more of a lead-carbon battery, a lithium iron phosphate battery, a ternary lithium battery, a sodium sulfur battery, and a flow battery.

[0090] For example, the power system may include the power system in an electric vehicle, Figure 3 A schematic diagram of a vehicle energy storage system provided by an embodiment of the present application is shown, specifically a schematic structural diagram of an example of a power system of an electric vehicle having a breaker provided by the present application. Figure 3 As shown, the electric vehicle includes a power battery and an electric drive system. The power battery includes a battery cluster, and 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.

[0091] In one implementation, the breaker provided in the present application can be arranged in the circuit between the battery cluster and the inverter circuit, that is, one end of the through-current bar of the breaker is connected to the battery cluster, and one end of the through-current bar of the breaker is connected to the DC bus of the inverter circuit. In this case, the breaker works in the DC circuit. The breaker can be used to cut off the electrical connection between the battery cluster and the electric drive system.

[0092] In another implementation, the breaker provided by the present application can be arranged in the circuit between the inverter circuit and the motor, that is, the breaker can cut off the electrical connection between the inverter circuit and the motor, that is, one end of the current-carrying bar of the breaker is connected to the AC busbar of the inverter circuit, and one end of the current-carrying bar of the breaker is connected to the motor. In this case, the breaker works in the AC circuit. The breaker can be used to cut off the electrical connection between the inverter circuit and the motor.

[0093] The present application provides a circuit breaker 10, see Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the breaker 10 includes a base 110, a sealing cover 120, a current copper bar 130 and a piston 140. The base 110 has an arc extinguishing cavity 111, and the arc extinguishing cavity 111 can extinguish an arc. When the current copper bar 130 breaks, an arc is generated, and the arc is introduced into the arc extinguishing cavity 111 by the piston and extinguished by the arc extinguishing cavity 111.

[0094] The arc extinguishing chamber 111 has an opening in the positive Z direction, and the sealing cover 120 is disposed on one side of the opening in the positive Z direction of the arc extinguishing chamber 111. The sealing cover 120 is fixedly connected to the base 110, and the sealing cover 120 and the base 110 can be fixedly connected by bolts. Figure 4 and Figure 5 As shown, the sealing cover 120 and the base 110 are both provided with mounting holes 118, and bolts pass through the mounting holes 118 located on the sealing cover 120 and the base 110 to fix the sealing cover 120 and the base 110. After the sealing cover 120 is fixedly connected to the base 110, the sealing cover 120 is sealed and connected to the base 110 at the contact surface with the base 110 to prevent the high-temperature free gas in the arc extinguishing chamber 111 from leaking. The sealing cover 120 can be made of insulating material. The sealing cover 120 has a first channel 121 that runs through the thickness direction of the sealing cover 120, see Figure 4As shown, the thickness direction of the sealing cover 120 is the Z direction. The first channel 121 extends along the Z direction and penetrates the sealing cover 120, and one end of the first channel 121 in the opposite direction of Z is connected to the opening of the arc extinguishing chamber 111. The through-current copper bus 130 passes through the first channel 121 and is partially accommodated in the first channel 121. A second channel 122 that penetrates the sealing cover 120 is also provided in the sealing cover 120, and the second channel 122 and the first channel 121 are arranged crosswise. The first channel 121 extends along the Z direction and penetrates the sealing cover 120, and the second channel 122 extends along the X direction and penetrates the sealing cover 120. The first channel 121 and the second channel 122 are connected at the intersection of the extension direction, so that part of the through-current copper bus 130 will be accommodated in the first channel 121 and at the place where the first channel 121 and the second channel 122 are connected. It can be understood that the second channel 122 is used to accommodate the copper busbar 130, and the copper busbar 130 accommodated in the second channel 122 will completely occupy the internal space of the second channel 122. When the copper busbar 130 is taken out from the second channel 122, a second channel 122 penetrating the sealing cover 120 along the X direction can be displayed on the sealing cover 120.

[0095] The through-current copper bar 130 is arranged in parallel with the sealing cover 120, and the through-current copper bar 130 passes through the sealing cover 120 in a direction perpendicular to the thickness of the sealing cover 120. The thickness direction of the sealing cover 120 is the Z direction, the X direction is perpendicular to the Z direction, and the through-current copper bar 130 passes through the sealing cover 120 in the X direction. The through-current copper bar 130 can be partially located in the sealing cover 120, and the two sides of the through-current copper bar 130 along the X direction are located outside the sealing cover 120. The through-current copper bar 130 is used to electrically connect the circuit and can transmit current. One end of the through-current copper bar 130 located outside the sealing cover 120 is electrically connected to the power supply, and the other end is electrically connected to the load. The breaker 10 is connected to the circuit being used through the through-current copper bar 130.

[0096] A sealing structure in which a boss 1251 and a slot 1311 cooperate is formed between the sealing cover 120 and the copper busbar 130. The sealing cover 120 may be provided with a boss 1251, and the copper busbar 130 may be provided with a slot 1311; or the sealing cover 120 may be provided with a slot 1311, and the copper busbar 130 may be provided with a boss 1251. Specifically, the sealing cover 120 has a first contact surface 125 that is sealed and fitted with the copper busbar 130, and the copper busbar 130 has a second contact surface 131 that is sealed and fitted with the sealing cover 120. The first contact surface 125 may be located on one side of the copper busbar 130 in the positive direction of Z, and the first contact surface 125 may also be located on one side of the copper busbar 130 in the negative direction of Z. The second contact surface 131 may be a surface of the copper busbar 130 in the positive direction of Z, and the second contact surface 131 may also be a surface of the copper busbar 130 in the negative direction of Z. When the first contact surface 125 is located on the side of the copper busbar 130 in the positive direction of Z, the second contact surface 131 is the surface of the copper busbar 130 in the positive direction of Z. When the first contact surface 125 is located on the side of the copper busbar 130 in the negative direction of Z, the second contact surface 131 is the surface of the copper busbar 130 in the negative direction of Z. The first contact surface 125 and the second contact surface 131 are sealed and fitted, and the first contact surface 125 and the second contact surface 131 can be in direct contact to be sealed and fitted, or the first contact surface 125 and the second contact surface 131 can be in indirect contact, and it is only necessary to ensure that the copper busbar 130 can be sealed with the sealing cover 120 respectively. In the present application, the first contact surface 125 is located on the side of the copper busbar 130 in the positive direction of Z, the second contact surface 131 is the surface of the copper busbar 130 in the positive direction of Z, and the first contact surface 125 is in direct contact with the second contact surface 131.

[0097] See also Figure 7As shown, the first contact surface 125 is located on one side of the through-flow copper bar 130 in the positive Z direction, and a boss 1251 is provided on the first contact surface 125. The boss 1251 and the first contact surface 125 are an integral structure, and a portion of the first contact surface 125 protrudes in the negative Z direction to form the boss 1251. The first channel 121 penetrates the sealing cover 120 in the Z direction, and the through-flow copper bar 130 passes through the sealing cover 120 in the Z direction, and a portion of the structure of the through-flow copper bar 130 is located in the first channel 121. The portion of the through-flow copper bar 130 located in the first channel 121 includes a thinning portion 134, and the thickness of the thinning portion 134 is less than the thickness of other portions of the through-flow copper bar 130. The surface of the copper busbar 130 on the positive Z direction is the second contact surface 131. The second contact surface 131 includes the surface of the thinning portion 134 on the positive Z direction and the surface of the other parts of the copper busbar 130 except the thinning portion 134 on the positive Z direction. The surface of the thinning portion 134 on the positive Z direction is located on the negative Z direction side of the surface of the other parts of the copper busbar 130 except the thinning portion 134 on the positive Z direction. The surface of the thinning portion 134 on the negative Z direction is flush with the surface of the other parts of the copper busbar 130 except the thinning portion 134 on the negative Z direction, so that the thinning portion 134 and the other parts of the copper busbar 130 form a slot 1311.

[0098] The boss 1251 is located in the slot 1311 and is sealed and connected to the inner wall of the slot 1311. The cooperation and sealing connection between the boss 1251 and the slot 1311 can increase the contact area between the sealing cover 120 and the copper busbar 130, extend and complicate the gas flow path, thereby forming a better seal between the copper busbar 130 and the sealing cover 120, effectively preventing gas from leaking from the contact between the copper busbar 130 and the sealing cover 120, and ensuring the airtightness between the copper busbar 130 and the sealing cover 120 of the system. At the same time, the cooperation between the boss 1251 and the slot 1311 can also form a limit between the copper busbar 130 and the sealing cover 120, preventing the copper busbar 130 from moving relative to the sealing cover 120.

[0099] At least part of the piston 140 is accommodated in the first channel 121, and along the thickness direction (Z direction) of the sealing cover 120, the projection of the piston 140 and the thinned portion 134 at least partially overlap. Along the Z direction, the projection of the piston 140 and the thinned portion 134 may partially overlap or completely overlap. The piston 140 can move in the first channel 121 to break the through-current copper bar 130 and enter the arc extinguishing chamber 111. When the piston 140 does not move, one end of the piston 140 in the Z reverse direction is accommodated in the first channel 121. When the piston 140 moves, the piston 140 breaks the thinned portion 134 of the through-current copper bar 130 and enters the arc extinguishing chamber 111, and one end of the piston 140 in the Z positive direction is accommodated in the first channel 121. The piston 140 can be driven by a power mechanism, so that the piston 140 can move in the first channel 121 to break the thinned portion 134 of the through-current copper bar 130 and enter the arc extinguishing chamber 111.

[0100] In one embodiment, see Figure 7 As shown, the power mechanism (not shown in the figure) is arranged on the side of the piston 140 away from the base 110, and the power mechanism is arranged on the side of the piston 140 along the positive direction of Z. The number of power mechanisms is at least two to be matched with the piston 140 in a one-to-one connection. Each piston 140 has a special power mechanism to drive the piston 140 to move. The side of the power mechanism in the negative direction of Z can be in direct contact with the side of the piston 140 in the positive direction of Z, and the side of the power mechanism in the negative direction of Z can also be spaced from the side of the piston 140 in the positive direction of Z. The power mechanism can receive a control signal and generate a thrust to drive the piston 140 to move based on the control signal. In one embodiment, a controller can be integrated in the breaker 10, and the controller sends a control signal to the power mechanism. In one embodiment, the controller can also be set independently of the breaker 10. The power mechanism can generate a thrust to drive the piston 140 to move by explosion or the like. In one embodiment, the power mechanism can be an ignition device. The ignition device ignites and explodes when receiving the ignition signal sent by the controller, and the impact force generated by the explosion drives the piston 140 to move. The circuit breaker 10 may be a pyrotechnic power-off protection circuit breaker.

[0101] When the power mechanism is not working, the piston 140 is located on one side of the arc extinguishing chamber 111 in the positive direction Z. When the power mechanism is working, the power mechanism drives the piston 140 to break the thinned portion 134 of the through-current copper bar 130, and enters the arc extinguishing chamber 111 corresponding to the piston 140 from the top of the arc extinguishing chamber 111 along the negative direction Z. An arc is formed after the through-current copper bar 130 is disconnected. After the piston 140 enters the arc extinguishing chamber 111, an annular air channel is formed between the outer wall of the piston 140 and the side wall of the arc extinguishing chamber 111, and the annular air channel surrounds the outer side of the piston 140. It can be understood that the shape of the opening of the arc extinguishing chamber 111 can be the same as the shape of the part of the piston 140 located in the arc extinguishing chamber 111, and the opening size of the arc extinguishing chamber 111 is larger than the size of the part of the piston 140 located in the arc extinguishing chamber 111, so that an annular air channel is formed between the outer wall of the piston 140 and the side wall of the arc extinguishing chamber 111. The piston 140 can introduce the arc into the annular air channel. The longer annular gas channel can lengthen the arc, thereby quickly increasing the arc voltage and achieving rapid arc extinguishing.

[0102] The sealing cover 120 and the copper busbar of the breaker 10 provided in the present application have good air tightness. A sealing structure in which a boss 1251 and a slot 1311 cooperate is formed between the sealing cover 120 and the copper busbar 130. The boss 1251 can be located in the slot 1311, so that the first contact surface 125 of the sealing cover 120 and the second contact surface 131 of the copper busbar 130 can be sealed and fitted. The sealing connection between the boss 1251 and the slot 1311 can achieve a better seal between the copper busbar 130 and the sealing cover 120. The copper busbar 130 in the present application has good air tightness with the sealing cover 120, which can prevent the high-temperature free gas in the arc extinguishing chamber 111 from diffusing to the copper busbar 130 along the positive direction Z, thereby facilitating the breaker 10 to quickly cut off the current and protect the safe operation of the power system.

[0103] In one possible implementation, see Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the slot 1311 is located on the side of the copper busbar 130 away from the base 110 , and the boss 1251 is disposed on the sealing cover 120 . The boss 1251 extends from the side of the copper busbar 130 away from the base 110 to the slot 1311 .

[0104] The copper busbar 130 includes a connecting portion 132 and a bending portion 133, wherein the bending portion 133 is located between two adjacent connecting portions 132. A connecting portion 132 is connected between two adjacent bending portions 133. Part of the connecting portion 132 of the copper busbar 130 can be located outside the sealing cover 120 and electrically connected to the power supply and the load, respectively. Both the connecting portion 132 and the bending portion 133 can pass current. When the piston 140 moves in the reverse direction Z, the piston 140 breaks through the bending portion 133 and enters the arc extinguishing chamber 111. The number of the bending portions 133 is the same as the number of the arc extinguishing chambers 111. Figure 7 In the embodiment, there are two arc extinguishing chambers 111 and two bending portions 133, and the bending portions 133 are matched one-to-one with the arc extinguishing chambers 111. The surface of the bending portion 133 in the Z-opposite direction and the surface of the connecting portion 132 in the Z-opposite direction are located in the same plane, and the portion of the bending portion 133 located in the first channel 121 is a thinning portion 134, and the thickness of the thinning portion 134 in the Z-direction is less than the thickness of the connecting portion 132 in the Z-direction, so that a slot 1311 is formed between the thinning portion 134 and the connecting portion 132, and the slot 1311 is located on one side of the thinning portion 134 in the Z-positive direction, and the boss 1251 is located on the sealing cover 120 and extends into the slot 1311 in the Z-opposite direction. The sealing cover 120 is fixedly connected to the through-current copper bus 130 by the cooperation of the boss 1251 and the slot 1311, and the air tightness can also be enhanced.

[0105] In a possible implementation, the boss 1251 includes a first through hole 1263, and the first through hole 1263 may penetrate the boss 1251 along the Z direction. The first through hole 1263 is connected to the first channel 121, and the first through hole 1263 may be a part of the first channel 121. The first through hole 1263 may be located on one side of the thinning portion 134 in the positive Z direction. The projection of the first through hole 1263 along the thickness direction (Z direction) of the sealing cover 120 at least partially overlaps with the thinning portion 134. The projection of the first through hole 1263 along the Z direction may partially overlap or completely overlap with the thinning portion 134. The boss 1251 may be located on the sealing cover 120 or on the through-current copper bus 130.

[0106] In one embodiment, see Figure 4 , Figure 5 , Figure 7 and Figure 8As shown, the boss 1251 is located on the Z-negative side of the sealing cover 120 and protrudes in the Z-negative direction, and the boss 1251 is located on the Z-positive side of the copper busbar 130. The boss 1251 includes a first through hole 1263, the first channel 121 penetrates the boss 1251 along the Z direction, the piston 140 is accommodated in the first channel 121, the copper busbar 130 is accommodated in the sealing cover 120, and the piston 140 can pass through the boss 1251 through the first through hole 1263 and break the thinned portion 134 of the copper busbar 130 to enter the arc extinguishing chamber 111.

[0107] In one possible implementation, see Figure 7 As shown, the edge of the first through hole 1263 is in close contact with the outer wall of the piston 140. Figure 7 As shown, the shape of the first through hole 1263 is the same as the shape of the part of the piston 140 that can pass through the first through hole 1263 and enter the arc extinguishing chamber 111. When the piston 140 breaks through the copper bar 130 and enters the arc extinguishing chamber 111, the piston 140 will plug the first through hole 1263, and the edge of the first through hole 1263 can be connected with the outer wall of the piston 140. Under this design, it can be ensured that a good seal is formed between the piston 140 and the first through hole 1263. When the copper bar 130 is broken by the piston 140, the high-temperature free gas in the arc extinguishing chamber 111 can be prevented from flowing in the positive direction Z, thereby improving the insulation performance of the copper bar 130 and preventing voltage breakdown between the broken copper bars 130. At the same time, it is also convenient for the piston 140 to move relative to the first through hole 1263, reducing the friction between the piston 140 and the edge of the first through hole 1263.

[0108] In one possible implementation, see Fig. 9 , Fig.10 and Fig.11 As shown, the sealing cover 120 includes a sealing upper cover 126 and a sealing lower cover 127, the sealing upper cover 126 is located on the Z positive direction side of the sealing lower cover 127, and the sealing upper cover 126, the sealing lower cover 127 and the base 110 are sequentially connected along the Z negative direction. A receiving groove 1261 is provided between the sealing upper cover 126 and the sealing lower cover 127. The receiving groove 1261 can be provided on the sealing upper cover 126, or the receiving groove 1261 can also be provided on the sealing lower cover 127, or the receiving groove 1261 can be provided on both the sealing upper cover 126 and the sealing lower cover 127. The receiving groove 1261 can be used to enclose the through-current copper bus 130. When the sealing upper cover 126 and the sealing lower cover 127 are buckled together, the flow copper bar 130 is located between the sealing upper cover 126 and the sealing lower cover 127, and part of the flow copper bar 130 is located in the accommodating groove 1261, so that the accommodating groove 1261 between the sealing upper cover 126 and the sealing lower cover 127 can enclose the flow copper bar 130 and fix the flow copper bar 130 in the sealing cover 120.

[0109] In one embodiment, see Fig.10 and Fig.11 As shown, a receiving groove 1261 is provided on the sealing upper cover 126 and the sealing lower cover 127. When the sealing upper cover 126 and the sealing lower cover 127 are buckled, the receiving grooves 1261 on the sealing upper cover 126 and the sealing lower cover 127 enclose and form the second channel 122, so that the sealing upper cover 126 and the sealing lower cover 127 are buckled to sandwich the flow copper bar 130 between the sealing upper cover 126 and the sealing lower cover 127. The receiving groove 1261 is located on both sides of the flow copper bar 130 in the Z direction. The inner wall surface of the receiving groove 1261 is in contact with the surface of the flow copper bar 130 on both sides in the Z direction. The flow copper bar 130 is sealed and in contact with the sealing upper cover 126 and the sealing lower cover 127, respectively.

[0110] In a possible implementation manner, the sealing upper cover 126 is provided with a first convex rib 1262, and the sealing lower cover 127 is provided with a first groove 1271, and / or, the sealing lower cover 127 is provided with a first convex rib 1262, and the sealing upper cover 126 is provided with a first groove 1271. In one embodiment, the sealing upper cover 126 is provided with a first convex rib 1262, and the sealing lower cover 127 is provided with a first groove 1271. In one embodiment, the sealing lower cover 127 is provided with a first convex rib 1262, and the sealing upper cover 126 is provided with a first groove 1271. In one embodiment, the sealing upper cover 126 is provided with a first convex rib 1262 and a first groove 1271, and the sealing lower cover 127 is provided with a first groove 1271 and a first convex rib 1262.

[0111] The first rib 1262 is plugged into the first groove 1271. The first rib 1262 is located in the first groove 1271 and is connected to the inner wall of the first groove 1271. The first rib 1262 can cooperate with the first groove 1271 so that the sealing upper cover 126 and the sealing lower cover 127 can be buckled together to be connected together. The number of the first ribs 1262 is at least two and they are located on both sides of the through-flow copper bus 130. The number of the first ribs 1262 can be two, three, four, and so on. The number of the first ribs 1262 located on both sides of the through-flow copper bus 130 can be equal or unequal. The first rib 1262 can be straight or bent. The present application does not limit the shape of the first rib 1262. Both ends of the first convex rib 1262 are in close contact with the through-current copper bar 130 . The first convex rib 1262 can limit the through-current copper bar 130 to prevent the through-current copper bar 130 from moving relative to the sealing cover 120 .

[0112] The following description will be made by taking the case where the first convex rib 1262 is provided on the sealing lower cover 127 and the first groove 1271 is provided on the sealing lower cover 127 as an example.

[0113] In one embodiment, see Fig.12 , Fig.14 , Fig.17 and Fig.19 As shown, the sealing lower cover 127 is provided with a first convex rib 1262, and the first convex rib 1262 protrudes along the positive direction of Z on the surface of the sealing lower cover 127 on the positive direction of Z. The number of the first convex ribs 1262 is four, and the shapes of the four first convex ribs 1262 are exactly the same. Two first convex ribs 1262 are respectively provided on both sides of the through-flow copper bar 130 along the Y direction. And the two first convex ribs 1262 on the same side of the through-flow copper bar 130 are arranged at intervals. The first convex rib 1262 is curved, and both ends of the first convex rib 1262 are fitted and connected with the side of the through-flow copper bar 130. The sealing upper cover 126 is provided with a first groove 1271 matching the first convex rib 1262, and the number of the first groove 1271 is also four. When the sealing upper cover 126 and the sealing lower cover 127 are buckled, the first convex rib 1262 is located in the first groove 1271, and the outer wall of the first convex rib 1262 is fitted and connected with the inner wall of the first groove 1271. The cooperation between the first convex rib 1262 and the first groove 1271 can improve the air tightness between the through-current copper bus 130, the sealing upper cover 126 and the sealing lower cover 127, and prevent gas leakage.

[0114] In one possible implementation, see Fig.13 and Fig.14 As shown, the sealing upper cover 126 is provided with a first through hole 1263, and the sealing lower cover 127 is provided with a second through hole 1272, and the first through hole 1263 and the second through hole 1272 are connected to form part of the first channel 121. The first through hole 1263 penetrates the sealing upper cover 126 along the Z direction, and the second through hole 1272 penetrates the sealing lower cover 127 along the Z direction. The first through hole 1263 can be connected to the second through hole 1272, and the first through hole 1263 and the second through hole 1272 can form part of the first channel 121. After breaking the through-current copper bar 130, the piston 140 will sequentially pass through the first through hole 1263 and the second through hole 1272 and then enter the arc extinguishing chamber 111.

[0115] See also Fig.17 , Fig.18A , Fig.19 and Fig. 20AAs shown, on one side or both sides of the through-current copper busbar 130 along the width direction thereof, the edges of the first through hole 1263 and the second through hole 1272 are provided with a spacing space 1273 between the through-current copper busbar 130. The width direction of the through-current copper busbar 130 is the Y direction. The spacing space 1273 can be located on one side of the through-current copper busbar 130 in the Y direction, or on both sides of the through-current copper busbar 130 in the Y direction. The first through hole 1263, the spacing space 1273 and the second through hole 1272 are connected in sequence along the Z direction. Partial edges of the first through hole 1263 and partial edges of the thinning portion 134 enclose the edges of the spacing space 1273. Partial edges of the second through hole 1272 and partial edges of the thinning portion 134 enclose the edges of the spacing space 1273. The projection of the spacing space 1273 in the Z direction does not overlap with the through-current copper busbar 130.

[0116] When the copper busbar 130 is broken, an arc will be generated, and the arc will propagate along the edge of the partition space 1273. The distance between the broken copper busbars 130 along the edge of the partition space 1273 is the creepage distance. Fig.18B and Fig. 20B As shown, to facilitate understanding of creepage distance, Fig.18B and Fig. 20B In the figure, a dotted line is added on the edge of the spacing space 1273 to indicate the creepage distance. The provision of the spacing space 1273 can effectively prevent arc discharge and improve the safety and reliability of the breaker 10. The edge of the spacing space 1273 formed between the current copper bus 130 and the second through hole is longer, which increases the creepage distance and reduces the possibility of arc discharge.

[0117] In one embodiment, see Fig.17 , Fig.18A , Fig.19 and Fig. 20A As shown, the spacing space 1273 is located on both sides of the through-current copper busbar 130 along the Y direction. The thinning portion 134 is located in a portion of the first channel 121 formed by the first through hole 1263 and the second through hole 1272 being connected. The through-current copper busbar 130 has a spacing space 1273 between the first through hole 1263 and the second through hole 1272 on both sides of the Y direction. It can be understood that the length of the thinning portion 134 in the Y direction is less than the length of the first through hole 1263 in the Y direction, and is also less than the length of the second through hole 1272 in the Y direction.

[0118] In one possible implementation, see Figure 4 , Fig.18A and Fig. 20AAs shown, along the extension direction of the copper busbar 130 , the length of the portion where the second through hole 1272 overlaps with the projection of the copper busbar 130 along the thickness direction of the sealing cover 120 is greater than the length of the portion where the first through hole 1263 overlaps with the projection of the copper busbar 130 along the thickness direction of the sealing cover 120 .

[0119] The extension direction of the copper busbar 130 is the X direction, and the thickness direction of the sealing cover 120 is the Z direction. The length of the portion where the second through hole 1272 overlaps with the projection of the copper busbar 130 along the Z direction is Fig. 20A The length L1 in the figure, the length of the first through hole 1263 overlapping with the projection of the through copper bus 130 along the Z direction is Fig.18A The length L2 in the middle is L1, which is greater than L2, so that the opening area of ​​the second through hole 1272 is greater than the opening area of ​​the first through hole 1263. Fig.21 As shown, the second through hole 1272 is located on the Z-opposite side of the first through hole 1263, L1 is greater than L2, the opening of the first through hole 1263 and the opening of the second through hole 1272 are shown by dotted lines, and the opening of the first through hole 1263 and the opening of the second through hole 1272 form a shape similar to an inverted trumpet. The opening of the second through hole 1272 is larger than the opening of the first through hole 1263. The larger opening makes the gas have less resistance during normal flow (flowing from the Z positive direction to the Z negative direction), but needs to overcome greater airflow resistance during reverse flow (flowing from the Z negative direction to the Z positive direction). When the high-temperature free gas in the arc extinguishing chamber 111 attempts to flow back from the arc extinguishing chamber 111 to the sealed upper cover 126, due to the larger opening of the second through hole 1272, the gas will encounter greater resistance when trying to flow back, thereby preventing the high-temperature free gas in the arc extinguishing chamber 111 from flowing back to the sealed upper cover 126, thereby improving air tightness.

[0120] In one possible implementation, see Figure 7 and Figure 8 As shown, the copper bar 130 is provided with a bending groove 1331 on the side facing the base 110, and the projection of the bending groove 1331 falls entirely into the projection of the second through hole 1272 along the thickness direction (Z direction) of the sealing cover 120. The copper bar 130 has a bending portion 133, and the bending portion 133 is partially located in the first channel 121, and the bending portion 133 is provided with a bending groove 1331. When the piston 140 breaks through the copper bar 130, the outer wall surface of the piston 140 will squeeze the copper bar 130, so that the copper bar 130 is bent and deformed. The bending groove 1331 can increase the deformation capacity of the copper bar 130 at the bending portion 133. When the piston 140 squeezes the copper bar 130, the existence of the bending groove 1331 makes it easier for the copper bar 130 to bend and deform along the bending groove 1331. The number of the bending grooves 1331 can be one, two, three, etc. The opening shape of the bending groove 1331 can be Figure 7The opening of the bending groove 1331 can also be a trapezoid, and the opening of the bending groove 1331 can also be a "V" shape, and the opening of the bending groove 1331 can also be a square. The present application does not limit the shape of the fracture 1332. The bending groove 1331 is arranged on the side of the through-flow copper bus 130 in the opposite direction of Z, and the opening of the bending groove 1331 faces the base 110. The opening of the bending groove 1331 is closer to the wing-shaped opening of the sealing lower cover 127. The second through hole 1272 on the sealing lower cover 127 is designed on the periphery of the bending groove 1331, ensuring that the through-flow copper bus 130 is easy to bend, and the design of the second through hole 1272 on the sealing lower cover 127 is also more convenient.

[0121] The projection of the bending groove 1331 along the thickness direction (Z direction) of the sealing cover 120 falls entirely within the projection of the second through hole 1272. In the Z direction, one edge of the opening of the bending groove 1331 may coincide with one edge of the second through hole 1272 (e.g., Fig. 22 The edge of the bending groove 1331 may not overlap with the edge of the second through hole 1272. In the Z direction, the projection of the edge of the bending groove 1331 is located in the projection of the second through hole 1272 and does not overlap (as shown in FIG. Fig.23 ). The bending portion 133 also has a fracture opening 1332. When the piston 140 breaks the copper busbar 130, the bending portion 133 breaks from the fracture opening 1332. The bending grooves 1331 located on both sides of the fracture opening 1332 in the X direction make the broken copper busbar 130 bend in the direction toward the side wall of the arc extinguishing chamber 111. The projection of the bending groove 1331 in the Z direction all falls into the projection of the second through hole 1272, so that the bent copper busbar 130 does not interfere with the sealing lower cover 127, which makes it easier for the piston 140 to break the copper busbar 130 to cut off the current.

[0122] In one embodiment, see Fig.23 As shown, two bending grooves 1331 are arranged on a bending portion 133 of the current copper busbar 130, and the two bending grooves 1331 are arranged at intervals along the X direction, and the two bending grooves 1331 are symmetrically arranged on both sides of the fracture 1332 in the X direction, and the opening of the bending groove 1331 faces the opposite direction of Z. In the Z direction, the projection of the edge of the bending groove 1331 does not overlap with the projection of the edge of the second through hole 1272. The projection of the edge of the bending groove 1331 is located on the X positive direction side of the projection of the edge of the second through hole 1272. When the piston 140 breaks the current copper busbar 130, the bending portion 133 breaks from the fracture 1332, and the bending grooves 1331 located on both sides of the fracture 1332 in the X direction cause the broken current copper busbar 130 to bend in the direction toward the side wall of the arc extinguishing chamber 111.

[0123] In one embodiment, see Fig.24As shown, two bending grooves 1331 are arranged on a bending portion 133 of the current copper busbar 130, and the two bending grooves 1331 are arranged at intervals along the X direction, and the two bending grooves 1331 are symmetrically arranged on both sides of the fracture 1332 in the X direction, and the opening of the bending groove 1331 faces the opposite direction of Z. In the Z direction, the projection of the edge of the bending groove 1331 does not overlap with the projection of the edge of the second through hole 1272. The projection of the edge of the bending groove 1331 is located on the opposite side of the projection of the edge of the second through hole 1272 in the X direction. When the piston 140 breaks the current copper busbar 130, the bending portion 133 breaks from the fracture 1332, and the bending grooves 1331 located on both sides of the fracture 1332 in the X direction cause the broken current copper busbar 130 to bend in the direction toward the side wall of the arc extinguishing chamber 111.

[0124] It can be understood that when the sealing cover 120 is an integrated structure, the projection of the bending groove 1331 in the Z direction can at least partially fall into the projection of the second sub-channel.

[0125] In one possible implementation, see Fig.25 and Fig.26 As shown, on one side or both sides of the through-current copper bar 130 along its width direction, there is a spacing space 1273 between the side wall of the first channel 121 and the through-current copper bar 130. In the present application, the width direction of the through-current copper bar 130 is the Y direction. When the through-current copper bar 130 is broken, an arc will be generated, and the arc will propagate along the edge of the spacing space 1273. The distance between the broken through-current copper bars 130 along the edge of the spacing space 1273 is the creepage distance. The provision of the spacing space 1273 can effectively prevent arc discharge and improve the safety and reliability of the breaker 10.

[0126] In one embodiment, see Fig.25 and Fig.26 As shown, the spacing space 1273 is located on both sides of the through-current copper busbar 130 along the Y direction. There is a spacing space 1273 between both sides of the thinning portion 134 in the Y direction and the side wall of the first channel 121 in the Y direction. The projection of the spacing space 1273 in the Z direction does not overlap with the through-current copper busbar 130. It can be understood that the length of the thinning portion 134 in the Y direction is less than the length of the edge of the first channel 121 in the Y direction.

[0127] In one possible implementation, see Fig.25 and Fig.26As shown, the first channel 121 includes a first sub-channel and a second sub-channel, the first sub-channel is located on the side of the through-flow copper bar 130 away from the base, and the second sub-channel is located on the side of the through-flow copper bar 130 close to the base; along the extension direction of the through-flow copper bar 130, the length of the second sub-channel in the thickness direction of the sealing cover 120 and the projection of the through-flow copper bar 130 overlaps, is greater than the length of the first sub-channel in the thickness direction of the sealing cover 120 and the projection of the through-flow copper bar 130 overlaps. The thickness direction of the sealing cover 120 is the Z direction. The extension direction of the through-flow copper bar 130 is the X direction.

[0128] The first sub-channel and the second sub-channel are arranged in sequence along the opposite direction of Z. The length of the second sub-channel overlapping with the projection of the through-current copper bar 130 along the Z direction is Fig.26 The length L1 in the figure, the length of the first sub-channel in the Z direction that overlaps with the projection of the through-current copper bar 130 is Fig.26 The length L2 in L1 is greater than L2, so that the opening area of ​​the second sub-channel is greater than the opening area of ​​the first sub-channel. The second sub-channel is located on the Z-opposite side of the first sub-channel, and the opening area of ​​the second sub-channel is greater than the opening area of ​​the first sub-channel. The larger opening area makes the gas have less resistance during normal flow, but needs to overcome greater airflow resistance during backflow. When the high-temperature free gas in the arc extinguishing chamber 111 attempts to flow back from the arc extinguishing chamber 111 to the sealing upper cover 126, due to the larger opening area of ​​the second sub-channel, the gas will encounter greater resistance when trying to flow back, thereby preventing the high-temperature free gas in the arc extinguishing chamber 111 from flowing back to the side of the sealing cover 120 in the Z positive direction.

[0129] In a possible implementation manner, the ratio of the depth of the slot 1311 to the thickness of the through-current copper bus 130 is in the range of 0.3 to 0.7. Figure 7 and Figure 8 As shown, the copper busbar 130 includes a connecting portion 132 and a bending portion 133, and the slot 1311 can be arranged on the bending portion 133 of the copper busbar 130. Figure 8 In the embodiment of the present application, the thickness L4 of the through-current copper bar 130 is the thickness of the through-current copper bar 130 when the slot 1311 is not provided on the through-current copper bar 130. The ratio of L3 to L4 is in the range of 0.3 to 0.7. The ratio of L3 to L4 can be 0.3, the ratio of L3 to L4 can be 0.5, and the ratio of L3 to L4 can be 0.7. The depth of the slot 1311 and the thickness of the through-current copper bar 130 are in the range of 0.3 to 0.7, which can ensure that the through-current copper bar 130 is sealed and connected to the sealing cover 120 through the slot 1311 and the boss 1251, and can also ensure that the through-current copper bar 130 can flow current and connect the circuit.

[0130] In a possible implementation, the copper busbar 130 has a fracture opening 1332 , and the piston 140 is provided with a tip portion 141 on the side facing the base 110 , and along the extension direction of the first channel 121 , the projections of the tip portion 141 and the fracture opening 1332 overlap.

[0131] See also Fig.28 As shown, the extension direction of the first channel 121 is the Z direction, and the copper busbar 130 includes a connecting portion 132 and a bending portion 133, and a fracture 1332 is provided on the bending portion 133. The fracture 1332 can reduce the thickness of the bending portion 133, so that the piston 140 can break the copper busbar 130. The piston 140 is provided with a tip 141 on the side facing the base 110 (the end of the piston 140 in the opposite direction of Z). The fracture 1332 is located directly below the tip 141 in the Z direction, and in the Z direction, the projections of the tip 141 and the fracture 1332 coincide. When the piston 140 moves in the opposite direction of Z, the tip 141 of the piston 140 is inserted into the fracture 1332 and breaks the copper busbar 130 from the fracture 1332.

[0132] In a possible implementation manner, the number of the fracture opening 1332 is one, and the fracture opening 1332 is located on one of the two sides of the through-current copper busbar 130 in the Z direction.

[0133] Alternatively, there are two fracture openings 1332, and the two fracture openings 1332 are respectively located on both sides of the through-current copper busbar 130 in the Z direction. The shapes of the two fracture openings 1332 located on both sides of the through-current copper busbar 130 in the Z direction may be the same or different. The projections of the two fracture openings 1332 along the Z direction at least partially overlap. The projections of the two fracture openings 1332 along the Z direction may partially overlap or completely overlap.

[0134] In one embodiment, see Fig.29 As shown, there is one fracture opening 1332, which is located on one side of the copper busbar 130 in the positive Z direction, and faces the tip 141 of the piston 140. When the piston 140 moves in the negative Z direction, the tip 141 of the piston 140 directly contacts the fracture opening 1332, so that the piston 140 can break the copper busbar 130.

[0135] In one embodiment, see Fig.30 As shown, there is one fracture opening 1332 , and the fracture opening 1332 is located on one side of the through-current copper busbar 130 in the opposite Z direction.

[0136] In one embodiment, see Fig. 27As shown, there are two fracture openings 1332, which are respectively located on both sides of the through-flow copper bar 130 in the Z direction, and the fracture openings 1332 located on both sides of the through-flow copper bar 130 in the Z direction have the same shape. The projections of the two fracture openings 1332 along the Z direction completely overlap. Both fracture openings 1332 are located directly below the piston 140 in the Z direction, and the two fracture openings 1332 can further reduce the thickness of the bent portion 133, so that the through-flow copper bar 130 is more easily broken by the piston 140.

[0137] The shape of the fracture 1332 can be Fig. 27 The shape of the fracture opening 1332 may also be a trapezoid (such as Fig.31 As shown in FIG. 1 , the shape of the fracture opening 1332 may also be a trapezoid. The present application does not limit the shape of the fracture opening 1332.

[0138] In one possible implementation, see Fig.32 As shown, the breaker 10 further includes a top cover 190, which is located on the side of the sealing cover 120 away from the base 110, and the top cover 190 is located on the Z positive direction side of the sealing cover 120, and the top cover 190, the sealing cover 120 and the base 110 are stacked in sequence along the Z negative direction. The top cover 190 is arranged on the Z positive direction side of the sealing cover 120, and the top cover 190 and the sealing cover 120 are covered and fixedly connected to protect the internal structure of the top cover 190, such as the driving mechanism. The top cover 190 and the sealing cover 120 are sealed and connected at the contact surface to prevent the gas inside the breaker 10 from leaking from between the top cover 190 and the sealing cover 120.

[0139] The sealing cover 120 is provided with a second convex rib 128, and the top cover 190 is provided with a second groove (filled by the second convex rib 128). When the sealing cover 120 is provided with the second convex rib 128, the second convex rib 128 may be located on the side of the sealing cover 120 in the positive Z direction and extend along the positive Z direction. Alternatively, the sealing cover 120 is provided with a second groove, and the top cover 190 is provided with a second convex rib 128. When the top cover 190 is provided with the second convex rib 128, the second convex rib 128 may be located on the side of the top cover 190 in the negative Z direction, and the second convex rib extends along the negative Z direction. Alternatively, the sealing cover 120 is provided with a second convex rib 128 and a second groove, and the top cover 190 is provided with a second groove and a second convex rib 128.

[0140] The second convex rib 128 is disposed around the periphery of the opening edge of the first channel 121. The sealing cover 120 is provided with the first channel 121. When the second convex rib 128 is located on the sealing cover 120, the second convex rib 128 is disposed around the periphery of the opening edge of the first channel 121. It can be understood that when the second convex rib 128 is located on the top cover 190, after the top cover 190 and the sealing cover 120 are covered, the positional relationship between the second convex rib 128 on the top cover 190 and the first channel 121 on the sealing cover 120 also belongs to the second convex rib 128 being disposed around the periphery of the opening edge of the first channel 121. When the top cover 190 and the sealing cover 120 are covered, the second convex rib 128 is located in the second groove and is in close contact with the inner wall of the second groove. In the stacking direction (Z direction) of the top cover 190 and the sealing cover 120, the projection of the arc extinguishing chamber 111 is completely located within the projection of the second rib 128, which can ensure that even if the gas in the arc extinguishing chamber 111 leaks from the first channel 121, it will not leak from between the top cover 190 and the sealing cover 120, thereby further improving the airtightness of the circuit breaker 10.

[0141] In one embodiment, the sealing cover 120 is an integrated structure, and the sealing cover 120 is provided with a second rib on one side in the positive direction of Z, and the top cover 190 is provided with a second groove on one side in the negative direction of Z. The second rib 128 extends along the positive direction of Z. The second rib 128 is arranged around the periphery of the first through hole 1263. In the embodiment of the present application, the second rib 128 is arranged around the sealing cover 120 along the four sides of the sealing cover 120, and forms a square-like shape. The first channel 121 is located inside the second rib 128, and the projection of the first channel 121 along the Z direction is also located inside the projection of the second rib 128. When the top cover 190 is covered with the sealing cover 120, the second rib 128 is located in the second groove, and the outer wall of the second rib 128 is in contact with the inner wall of the second groove. The cooperation between the second rib 128 and the second groove can improve the air tightness between the sealing cover 120 and the top cover 190. Even if the gas in the arc extinguishing chamber 111 leaks through the first channel 121, the existence of the second rib 128 and the second groove prevents the gas from leaking from between the top cover 190 and the sealing cover 120.

[0142] In one embodiment, see Fig.11 and Fig.32As shown, the sealing cover 120 can be composed of a sealing upper cover 126 and a sealing lower cover 127, and the top cover 190 is located on the Z positive direction side of the sealing upper cover 126. The top cover 190, the sealing upper cover 126, the sealing lower cover 127 and the base 110 are stacked in sequence along the Z negative direction. A second convex rib 128 is provided on the sealing upper cover 126, and a second groove is provided on the top cover 190. The second convex rib 128 is located in the second groove, and the outer wall of the second convex rib 128 is fitted and connected with the inner wall of the second groove, so that the top cover 190 and the sealing upper cover 126 can be sealed and connected while the top cover 190 and the sealing upper cover 126 are covered. The structure of the second convex rib 128 and the second groove is the same as the structure of the second convex rib 128 and the second groove when the sealing cover 120 is an integrated structure, and the present application will not repeat them here.

[0143] In a possible implementation, the sealing cover 120 is provided with a third rib 129, and the base 110 is provided with a third groove 116. When the sealing cover 120 is provided with the third rib 129, the third rib 129 may be located on the side of the sealing cover 120 in the negative Z direction and extend in the negative Z direction. Alternatively, the sealing cover 120 is provided with a third groove 116, and the base 110 is provided with a third rib 129. When the base 110 is provided with the third rib 129, the third rib 129 may be located on the side of the base 110 in the positive Z direction, and the third rib extends in the positive Z direction. Alternatively, the sealing cover 120 is provided with a third rib 129 and a third groove 116, and the base 110 is provided with a third groove 116 and a third rib 129.

[0144] The third rib 129 is disposed around the periphery of the opening edge of the first channel 121. The sealing cover 120 is provided with the first channel 121. When the third rib 129 is located on the sealing cover 120, the third rib 129 is disposed around the periphery of the opening edge of the first channel 121. It can be understood that when the third rib 129 is located on the base 110, after the base 110 and the sealing cover 120 are covered, the positional relationship between the third rib 129 on the base 110 and the first channel 121 on the sealing cover 120 also belongs to the third rib 129 being disposed around the periphery of the opening edge of the first channel 121. When the base 110 and the sealing cover 120 are covered, the third rib 129 is located in the third groove 116 and is closely connected to the inner wall of the third groove 116. In the stacking direction (Z direction) of the sealing cover 120 and the base 110, the projection of the arc extinguishing chamber 111 is completely located within the projection of the third rib 129, which can ensure that even if the gas in the arc extinguishing chamber 111 leaks from the first channel 121, it will not leak from between the base 110 and the sealing cover 120, thereby further improving the air tightness of the circuit breaker 10.

[0145] In one embodiment, the sealing cover 120 is an integrated structure, and a third rib is provided on one side of the sealing cover 120 in the negative Z direction, and a third groove 116 is provided on one side of the base 110 in the positive Z direction. The third rib 129 extends in the negative Z direction. The third rib 129 is arranged around the periphery of the first through hole 1263. In the embodiment of the present application, the third rib 129 is arranged on the sealing cover 120 in a surrounding manner along the four sides of the sealing cover 120, and forms a shape similar to a square. The first channel 121 is located inside the third rib 129, and the projection of the first channel 121 along the Z direction is also located inside the projection of the third rib 129. When the base 110 and the sealing cover 120 are covered, the third rib 129 is located in the third groove 116, and the outer wall of the third rib 129 is in contact with the inner wall of the third groove 116. The cooperation between the third rib 129 and the third groove 116 can improve the air tightness between the sealing cover 120 and the base 110. Even if the gas in the arc extinguishing chamber 111 leaks through the first channel 121, the presence of the third rib 129 and the third groove 116 prevents the gas from leaking from between the base 110 and the sealing cover 120.

[0146] In one embodiment, see Fig. 9 , Fig.10 and Fig.11 As shown, the sealing cover 120 may be composed of a sealing upper cover 126 and a sealing lower cover 127, the sealing lower cover 127 is provided with a third convex rib 129, and the base 110 is provided with a third groove 116. The third convex rib 129 is located in the third groove 116, and the outer wall of the third convex rib 129 is fitted and connected with the inner wall of the third groove 116, so that the base 110 and the sealing lower cover 127 can be sealed and connected while the base 110 and the sealing lower cover 127 are covered. The structure of the third convex rib 129 and the third groove 116 is the same as the structure of the third convex rib 129 and the third groove 116 when the sealing cover 120 is an integrated structure, and the present application will not repeat them here.

[0147] In one possible implementation, see Figure 7 , Fig.15 and Fig.16As shown, the number of arc extinguishing chambers 111 is at least two, and the number of arc extinguishing chambers 111 can be two, three, four, and so on. The arc extinguishing chambers 111 are arranged at intervals on the base 110. The sealing cover 120 is provided with a fourth rib 1291, and the base 110 is provided with a fourth groove 1161. When the sealing cover 120 is provided with the fourth rib 1291, the fourth rib 1291 can be located on the side of the sealing cover 120 in the Z-negative direction and extend in the Z-negative direction. Or the sealing cover 120 is provided with a fourth groove 1161, and the base 110 is provided with a fourth rib 1291. When the base 110 is provided with the fourth rib 1291, the fourth rib 1291 can be located on the side of the base 110 in the Z-positive direction, and the fourth rib extends in the Z-positive direction. Alternatively, the sealing cover 120 is provided with a fourth convex rib 1291 and a fourth groove 1161 , and the base 110 is provided with a fourth groove 1161 and a fourth convex rib 1291 .

[0148] The fourth rib 1291 has two ends connected to the third rib 129. The fourth rib 1291 and the third rib 129 may be an integral structure or two connected structures. The fourth groove 1161 and / or the fourth rib 1291 are located between two adjacent arc extinguishing chambers 111, which means that when the fourth groove 1161 and / or the fourth rib 1291 are located on the base 110, the fourth groove 1161 and / or the fourth rib 1291 are located between two adjacent arc extinguishing chambers 111; when the fourth groove 1161 and / or the fourth rib 1291 are located on the sealing cover 120, after the sealing cover 120 and the base 110 are covered, the positional relationship between the fourth groove 1161 and / or the fourth rib 1291 and the arc extinguishing chamber 111 also means that the fourth groove 1161 and / or the fourth rib 1291 are located between two adjacent arc extinguishing chambers 111. When the base 110 and the sealing cover 120 are covered, the fourth rib 1291 is located in the fourth groove 1161 and is closely connected to the inner wall of the fourth groove 1161. The cooperation between the fourth rib 1291 and the fourth groove 1161 can isolate two adjacent arc extinguishing chambers 111 to prevent the gases in the two adjacent arc extinguishing chambers 111 from penetrating each other.

[0149] In one embodiment, the sealing cover 120 is an integrated structure, and a fourth rib 1291 is provided on one side of the sealing cover 120 in the negative Z direction, and a fourth groove 1161 is provided on one side of the base 110 in the positive Z direction. The fourth rib 1291 extends in the negative Z direction. There are two arc extinguishing cavities 111 on the base 110. The fourth rib 1291 and the fourth groove 1161 are located between the two arc extinguishing cavities 111. The third rib 129 is arranged on the sealing cover 120 along the four sides of the sealing cover 120 and forms a square-like shape. The fourth rib 1291 and the third rib 129 can be an integrated structure, and the fourth rib 1291 is located inside the third rib 129. And the two ends of the fourth rib 1291 are connected to the third rib 129, and the cavity enclosed by the third rib 129 and the wall surface of the sealing cover 120 in the negative Z direction is divided into two sub-cavities, and is matched one-to-one with the arc extinguishing cavity 111. When the sealing cover 120 is covered with the base 110, the third rib 129 is located in the third groove 116, and the outer wall of the third rib 129 is fitted and connected with the inner wall of the third groove 116. The fourth rib 1291 is located in the fourth groove 1161, and the outer wall of the fourth rib 1291 is fitted and connected with the inner wall of the fourth groove 1161, thereby isolating two adjacent arc extinguishing chambers 111. Under this design, not only can the airtightness between the base 110 and the sealing cover 120 be further improved to prevent the high-temperature free gas in the arc extinguishing chamber 111 from being discharged, but also the two arc extinguishing chambers 111 are isolated, which can prevent the gases in different arc extinguishing chambers 111 from penetrating each other.

[0150] In one embodiment, see Fig. 9 , Fig.10 and Fig.11 As shown, the sealing cover 120 may be composed of a sealing upper cover 126 and a sealing lower cover 127, the sealing lower cover 127 is provided with a fourth rib 1291, and the base 110 is provided with a fourth groove 1161. The number of arc extinguishing chambers 111 on the base 110 is two. The fourth rib 1291 is located in the fourth groove 1161, and the outer wall of the fourth rib 1291 is fitted and connected with the inner wall of the fourth groove 1161, so that the base 110 and the sealing lower cover 127 can be sealed and connected while the base 110 and the sealing lower cover 127 are covered. The structure of the fourth rib 1291 and the fourth groove 1161 is the same as the structure of the fourth rib 1291 and the fourth groove 1161 when the sealing cover 120 is an integrated structure, and the present application will not repeat them here.

[0151] In a possible implementation, at least one of the second rib 128, the third rib 129, and the fourth rib 1291 is provided with a mounting hole 118, and the mounting hole 118 is used to cooperate with a fastener to fix the sealing cover 120 and the base 110. The mounting holes 118 on the second rib 128, the third rib 129, and the fourth rib 1291 penetrate the second rib 128, the third rib 129, and the fourth rib 1291 along the Z direction. On at least one of the second rib 128, the third rib 129, and the fourth rib 1291, the mounting hole 118 can be sealed by the cooperation between the rib and the groove. The fastener can pass through the mounting hole to fix the sealing cover 120 and the base together. The fastener can be a screw or a pin. The fastener can be hidden in the mounting hole 118, and the top cover 190, the sealing cover 120, the base 110, and other structures with the mounting hole 118 are all made of insulating structures such as plastic, and the inner wall of the mounting hole can insulate the fastener from the external conductive structure.

[0152] In one embodiment, see Fig. 9 , Fig.10 and Fig.11 As shown, the second rib 128, the third rib 129 and the fourth rib 1291 are all provided with mounting holes 118, and the mounting holes 118 penetrate the second rib 128, the third rib 129 and the fourth rib 1291 along the Z direction. The mounting holes 118 on the second rib 128 are the same size as the mounting holes 118 on the third rib 129 and are coaxially arranged. The mounting holes 118 on the second rib 128 are the same size as the mounting holes 118 on the fourth rib 1291 and are coaxially arranged. The base 110 is also provided with mounting holes 118, and the mounting holes 118 on the base 110, the mounting holes 118 on the second rib 128 and the mounting holes 118 on the third rib 129 are the same size and are coaxially arranged. The fastener can pass through the mounting holes 118 on the second rib 128, the mounting holes 118 on the third rib 129 and the mounting holes 118 on the base 110 in sequence to fix the sealing cover 120 and the base 110. The fasteners may also sequentially pass through the mounting holes 118 on the second rib 128, the mounting holes 118 on the fourth rib 1291, and the mounting holes 118 on the base 110 to fix the sealing cover 120 and the base 110. The mounting holes 118 are provided on the second rib 128, the third rib 129, and the fourth rib 1291, so that the base 110 and the sealing cover 120 can be sealed and the sealing cover 120 and the base 110 can be fixedly connected.

[0153] The present application also provides a power distribution device, including a connector and the breaker 10 described in any one of the above embodiments, the connector is used to electrically connect the power supply, and the connector is electrically connected between the breaker 10 and the power supply.

[0154] An embodiment of the present application also provides a power distribution device, which is used to implement circuit deployment and allocation. It can be used in the power distribution system of wireless high-power 5G (fifth-generation mobile communication technology, abbreviated as 5G) base stations, and can also be used in the power distribution system of household circuits. This embodiment does not limit the application field of the power distribution equipment, and can be used for line connections in any field.

[0155] The power distribution equipment may include a connector and a breaker 10, wherein the connector is electrically connected to the breaker 10 as an intermediate transition connector, the connector is electrically connected to the power supply, the breaker 10 is electrically connected between the connector and the power supply, and a connection hole may be provided on the current copper bus 130 of the breaker 10 to connect with the connector. The connector enables each breaker 10 to be connected to a power supply. The power supply may be a mains supply, a generator, a battery, etc.

[0156] The present application also provides a vehicle 30, see Fig.33 As shown, it includes a power supply 300 and the power distribution equipment described in the above embodiment, and the breaker 10 is electrically connected between the connector 200 and the power supply 300. The vehicle 30 provided in the present application includes but is not limited to electric vehicles, motorcycles or buses. Taking an electric vehicle as an example, the electric vehicle includes a power supply 300 and a connector 200, and the power supply 300 can be a battery pack in the electric vehicle. The breaker 10 is electrically connected between the connector 200 and the power supply 300. When a circuit system in the electric vehicle fails, the breaker 10 is disconnected to cut off the current.

[0157] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A circuit breaker, characterized in that: include: A base having an arc extinguishing cavity; A sealing cover, arranged at one side of the arc extinguishing chamber opening, the sealing cover having a first channel penetrating the sealing cover in a thickness direction, the first channel being in communication with the opening of the arc extinguishing chamber; A through-flow copper bar, wherein the through-flow copper bar is arranged in parallel with the sealing cover and passes through the sealing cover in a direction perpendicular to the thickness of the sealing cover, a sealing structure in which a boss and a slot cooperate is formed between the sealing cover and the through-flow copper bar, and a portion of the through-flow copper bar located in the first channel includes a thinned portion, and a thickness of the thinned portion is less than a thickness of other portions of the through-flow copper bar; The piston is at least partially accommodated in the first channel, and a projection of the piston along the thickness direction of the sealing cover at least partially overlaps with the thinned portion.

2. The circuit breaker according to claim 1, characterized in that: The slot is located at a side of the copper busbar facing away from the base, and the boss is arranged on the sealing cover and extends from a side of the copper busbar facing away from the base to the slot.

3. The circuit breaker according to claim 1 or 2, characterized in that: The boss includes a first through hole, the first through hole is connected to the first channel, and a projection of the first through hole along a thickness direction of the sealing cover at least partially overlaps with the thinned portion.

4. The breaker according to claim 3, characterized in that: The edge of the first through hole is in close contact with the outer wall surface of the piston.

5. The circuit breaker according to any one of claims 1 to 4, characterized in that: The sealing cover comprises a sealing upper cover and a sealing lower cover, wherein the sealing upper cover, the sealing lower cover and the base are connected in sequence, and a receiving groove is provided between the sealing upper cover and the sealing lower cover, and the receiving groove is used to enclose the through-current copper busbar.

6. The circuit breaker according to claim 5, characterized in that: The sealing upper cover is provided with a first convex rib, and the sealing lower cover is provided with a first groove, and / or the sealing lower cover is provided with a first convex rib, and the sealing upper cover is provided with a first groove; The first convex rib is plugged into the first groove, and the first convex rib is located on both sides of the through-current copper busbar.

7. The circuit breaker according to claim 5 or 6, characterized in that: The sealing upper cover is provided with the first through hole, and the sealing lower cover is provided with the second through hole. The first through hole and the second through hole are connected to form part of the first channel. On one side or both sides of the through-flow copper busbar along its width direction, there is a spacing space between the edges of the first through hole and the second through hole and the through-flow copper busbar.

8. The circuit breaker according to claim 7, characterized in that: Along the extension direction of the copper busbar, the length of the overlapping portion of the second through hole along the thickness direction of the sealing cover and the projection of the copper busbar is greater than the length of the overlapping portion of the first through hole along the thickness direction of the sealing cover and the projection of the copper busbar.

9. The circuit breaker according to claim 7 or 8, characterized in that: The through-current copper busbar is provided with a bending groove on a side facing the base, and along the thickness direction of the sealing cover, the projection of the bending groove completely falls within the projection of the second through hole.

10. The circuit breaker according to any one of claims 1 to 4, characterized in that: The first channel includes a first sub-channel and a second sub-channel, the first sub-channel is located on a side of the through-current copper bar away from the base, and the second sub-channel is located on a side of the through-current copper bar close to the base; In the extension direction of the through-current copper busbar, the length of the second sub-channel in the thickness direction of the sealing cover and the overlapping portion of the projection of the through-current copper busbar is greater than the length of the first sub-channel in the thickness direction of the sealing cover and the overlapping portion of the projection of the through-current copper busbar.

11. The circuit breaker according to any one of claims 1 to 4, characterized in that: On one side or both sides of the through-current copper bar along the width direction thereof, there is a spacing space between the side wall of the first channel and the through-current copper bar.

12. The circuit breaker according to any one of claims 1 to 11, characterized in that: The ratio of the depth of the slot to the thickness of the through-current copper busbar is in the range of 0.3 to 0.

7.

13. The circuit breaker according to any one of claims 1 to 12, characterized in that , the breaker also includes a top cover, which is located on a side of the sealing cover away from the base; The sealing cover is provided with a second convex rib, and the top cover is provided with a second groove, and / or the sealing cover is provided with a second groove, and the top cover is provided with a second convex rib; The second convex rib is disposed around the periphery of the opening edge of the first channel; The second rib is located in the second groove.

14. The circuit breaker according to claim 13, characterized in that: The sealing cover is provided with a third rib, and the base is provided with a third groove, and / or the sealing cover is provided with a third groove, and the base is provided with a third rib; The third convex rib is arranged around the periphery of the opening edge of the first channel; The third convex rib is located in the third groove.

15. The circuit breaker according to claim 14, characterized in that: The number of the arc extinguishing chambers is at least two, the sealing cover is provided with a fourth convex rib, the base is provided with a fourth groove, and / or the sealing cover is provided with a fourth groove, the base is provided with the fourth convex rib; Both ends of the fourth rib are connected to the third rib, the fourth groove and / or the fourth rib are located between two adjacent arc extinguishing chambers, and the fourth rib is located in the fourth groove and is closely connected to the inner wall of the fourth groove.

16. The circuit breaker according to claim 15, characterized in that: At least one of the second convex rib, the third convex rib and the fourth convex rib is provided with a mounting hole, the mounting hole is used to pass a fastener, and the fastener is used to fix the sealing cover and the base.

17. A power distribution device, characterized in that: It comprises a connector and a breaker according to any one of claims 1 to 16, wherein the connector is used to electrically connect a power source, and the breaker is electrically connected between the connector and the power source.

18. A vehicle, characterized in that: It comprises a power supply and the power distribution equipment as claimed in claim 17, wherein the power supply is electrically connected to the power distribution equipment, and the breaker is electrically connected between the connector and the power supply.

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