Direct current contactor, switch box and energy storage system

Abstract

The utility model provides a direct current contactor, a switch box and an energy storage system, and relates to the technical field of direct current contactors, the direct current contactor comprises a housing, and a contact module and a driving module arranged in the housing; the contact module comprises a moving contact and a static contact. The driving module comprises a driving rod, a metal body, a first coil, a second coil and at least two elastic parts; the metal body is rigidly connected with the moving contact through the driving rod; the first coil is located above the metal body and is of a hollow structure, and the driving rod penetrates through the hollow part of the first coil; the second coil is positioned below the metal body; one end of each elastic component is installed on the same horizontal plane of the side face between the first coil and the second coil, the other end of each elastic component is installed on the side edge of the metal body or the driving rod, and the elastic components are always in a compressed state. The power consumption of the DC contactor can be reduced, and the on-off state stability of the DC contactor can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current contactors, and more specifically to a direct current contactor, a switch box and an energy storage system. Background Art

[0002] At present, the commonly used DC contactor is a DC contactor with a normally open main contact. Its working principle is: when the main contact is in the disconnected state, if the main contact needs to be closed, the coil is energized to close the main contact; when the main contact remains in the closed state, current still needs to pass through the coil; when the power supply to the coil is stopped, the main contact is disconnected under the action of gravity.

[0003] However, since the coil needs to be continuously powered when the main contacts remain in a closed state, the current DC contactors have a problem of high power consumption. In addition, if a fault occurs in the coil power supply circuit when the main contacts remain in a closed state, the main contacts will be disconnected. That is, the closed state of the DC contactor will be affected by the fault in the coil power supply circuit, so the current DC contactors also have a problem of poor closed state stability.

[0004] Based on this, how to reduce the power consumption of the DC contactor and improve the closed state stability of the DC contactor have become technical problems that need to be solved urgently. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a DC contactor, a switch box and an energy storage system.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model provides a DC contactor, comprising: a shell, and a contact module and a drive module arranged inside the shell; wherein:

[0008] The contact module comprises: a moving contact and a stationary contact;

[0009] The driving module comprises: a driving rod, a metal body, a first coil, a second coil and at least two elastic components;

[0010] The metal body is rigidly connected to the moving contact through the driving rod;

[0011] The first coil is located above the metal body and is a hollow structure, and the driving rod passes through the hollow part thereof;

[0012] The second coil is located below the metal body;

[0013] One end of each elastic component is installed on the same horizontal plane of the side between the first coil and the second coil, and the other end is installed on the side of the metal body or the driving rod, and is always in a compressed state.

[0014] Optionally, the second coil is a solid structure.

[0015] Optionally, the driving module further includes: a first buffer device and a second buffer device;

[0016] The first buffer device is arranged between the first coil and the metal body, and is used to mitigate the impact of the metal body on the first coil;

[0017] The second buffer device is arranged between the second coil and the metal body, and is used to mitigate the impact of the metal body on the second coil.

[0018] Optionally, the second coil is a hollow structure, and the driving rod passes through the hollow portion thereof.

[0019] Optionally, the driving module further includes: a third buffer device and a fourth buffer device;

[0020] The third buffer device is disposed between the first coil and the metal body, and is used to mitigate the impact of the metal body on the first coil;

[0021] The fourth buffer device is arranged between the shell and the second coil, and is used to mitigate the impact of the driving rod on the shell.

[0022] Optionally, the contact module further includes: an arc extinguishing device;

[0023] The arc extinguishing device is arranged in a one-to-one correspondence with the static contact, and is used to extinguish the arc generated between the corresponding static contact and the moving contact.

[0024] Optionally, the number of the elastic components is 2, 3 or 4.

[0025] The utility model also provides a switch box, comprising: a first DC contactor;

[0026] The first DC contactor is the DC contactor described above, and is connected to any one-pole transmission branch of the switch box.

[0027] Optionally, the switch box of the utility model further includes: a second DC contactor;

[0028] The second DC contactor is the DC contactor described above, and is connected to a transmission branch of the switch box that is different from the transmission branch where the first DC contactor is located.

[0029] Optionally, the switch box of the utility model further includes: a first overcurrent protection device;

[0030] The first overcurrent protection device is connected to any one-pole transmission branch of the switch box.

[0031] Optionally, the switch box of the utility model further includes: a second overcurrent protection device;

[0032] The second overcurrent protection device is connected to a transmission branch of the switch box that is different from the transmission branch where the first overcurrent protection device is located.

[0033] The utility model also provides an energy storage system, comprising: a battery system, a switch box as described above, a power conversion system and a battery control unit;

[0034] The battery system is connected to the DC side of the power conversion system through the switch box;

[0035] The output ends of the battery control unit are respectively connected to the coils of the DC contactors in the switch box.

[0036] Optionally, the battery control unit includes: a control circuit and a coil power supply circuit;

[0037] The control circuit is connected to the input end of the coil power supply circuit;

[0038] The output end of the coil power supply circuit is connected to the coil.

[0039] Optionally, the battery control unit further includes: a detection circuit;

[0040] The input end of the detection circuit obtains a detection signal for determining the on / off condition of the DC contactor, and the output end of the detection circuit outputs an on / off condition characterization signal of the DC contactor to the control circuit.

[0041] Optionally, the battery control unit is integrated into the switch box; or,

[0042] The battery control unit is integrated into an auxiliary system of the energy storage system.

[0043] The DC contactor provided by the utility model comprises: a shell, and a contact module and a driving module arranged inside the shell; wherein the contact module comprises: a moving contact and a stationary contact; the driving module comprises: a driving rod, a metal body, a first coil, a second coil and at least two elastic components; the metal body is rigidly connected with the moving contact through the driving rod; the first coil is located above the metal body and is a hollow structure, and the driving rod passes through the hollow part of the first coil; the second coil is located below the metal body; each elastic component has one end installed on the same horizontal plane of the side between the first coil and the second coil, and the other end installed on the side of the metal body or the driving rod, and is always in a compressed state.

[0044] Based on this, the first coil and the second coil are respectively located above and below the metal body, and when the DC contactor maintains any state, the corresponding coil can be powered, so that the coil generates a force to push the metal body to move, and then the metal body drives the moving contact to move, thereby changing the state of the DC contactor. Since the elastic component is always in a compressed state, when the moving contact stops moving, the moving contact can continue to maintain the current state due to the elastic force of the elastic component, that is, the utility model maintains the on-off state of the DC contactor through the elastic force of the elastic component, therefore, the utility model can reduce the power consumption of the DC contactor, and since the elastic force of the elastic component has high stability, the utility model can also improve the on-off stability of the DC contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0046] Figure 1 It is a structural schematic diagram of a DC contactor provided by an embodiment of the utility model;

[0047] Figure 2 It is a structural schematic diagram of another DC contactor provided by an embodiment of the utility model;

[0048] Figure 3 It is a schematic diagram of the structure of a disc coil;

[0049] Figure 4 It is a structural schematic diagram of a switch box provided by an embodiment of the utility model;

[0050] Figure 5 It is a structural schematic diagram of an energy storage system provided by an embodiment of the utility model;

[0051] Figure 6 It is a structural schematic diagram of another energy storage system provided by an embodiment of the utility model;

[0052] Figure 7 It is a structural schematic diagram of another energy storage system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0054] At present, the commonly used DC contactor is a DC contactor with a normally open main contact. Its working principle is: when the main contact is in the disconnected state, if the main contact needs to be closed, the coil is energized to close the main contact; when the main contact remains in the closed state, current still needs to pass through the coil; when the power supply to the coil is stopped, the main contact is disconnected under the action of gravity.

[0055] However, since the coil needs to be continuously powered when the main contacts remain in a closed state, the current DC contactors have a problem of high power consumption. In addition, if a fault occurs in the coil power supply circuit when the main contacts remain in a closed state, the main contacts will be disconnected. That is, the closed state of the DC contactor will be affected by the fault in the coil power supply circuit, so the current DC contactors also have a problem of poor closed state stability.

[0056] Based on this, in order to reduce the power consumption of the DC contactor and improve the closed state stability of the DC contactor, the utility model provides a DC contactor, a switch box and an energy storage system. The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings.

[0057] Figure 1 Schematic diagram of the structure of a DC contactor provided by the embodiment of the utility model. Figure 1 As shown, the DC contactor comprises: a housing 11 , and a contact module 12 and a drive module 13 arranged inside the housing 11 .

[0058] The space surrounded by the housing 11 is a closed space.

[0059] The contact module 12 includes a moving contact 121 and a stationary contact 122. The number of the stationary contacts 122 may be two, and the upper ends of the stationary contacts 122 are exposed from the housing 11 to be used as connection terminals.

[0060] The driving module 13 includes: a driving rod 131, a metal body 132, a first coil 133, a second coil 134 and at least two elastic components 135. The positions of the first coil 133 and the second coil 134 are fixed.

[0061] The metal body 132 is rigidly connected to the moving contact 121 through the driving rod 131. The driving rod 131 is made of insulating material. The appearance structure of the metal body 132 can be cylindrical or other shapes.

[0062] The first coil 133 is located above the metal body 132 and has a hollow structure, through which the driving rod 131 passes.

[0063] The second coil 134 is located below the metal body 132 .

[0064] Each elastic component 135 has one end mounted on the same horizontal plane of the side between the first coil 133 and the second coil 134, and the other end mounted on the side of the metal body 132 or the driving rod 131, and is always in a compressed state. Each elastic component 135 can be evenly distributed in a circle and surround the metal body 132 at the center. In addition, according to the design force requirements, the number of elastic components 135 can be 2, 3 or 4, etc., which is not specifically limited in the embodiment of the utility model. The elastic component 135 can be a spring ( Figure 1 The elastic component 135 is taken as an example to be described as a spring). In addition, the elastic component 135 can also be other elastic components in the prior art that can implement the present application.

[0065] In actual use, Figure 1 As shown in Figure (b), when the DC contactor is in a closed state, if the DC contactor needs to be disconnected, the first coil 133 is powered to generate a changing magnetic field at the first coil 133. The changing magnetic field passes through the metal body 132, and eddy currents are induced in the metal body 132. The magnetic field generated by the eddy current is opposite to the direction of the changing magnetic field generated at the first coil 133, and then a repulsive force is generated between the first coil 133 and the metal body 132. Under the action of the repulsive force, the metal body 132 will drive the moving contact 121 to move downward. In the process of the metal body 132 moving downward, at the beginning, the elastic force of the elastic component 135 will become the resistance of the metal body 132 when it moves downward. When the end of the elastic component 135 connected to the metal body 132 or the driving rod 131 is lower than the other end, the elastic force of the elastic component 135 will become the thrust of the metal body 132 when it moves downward. Finally, the DC contactor is maintained in the disconnected state under the action of the gravity of the rigidly connected metal body 132 , the driving rod 131 and the moving contact 121 and the elastic force of the elastic component 135 . At this time, no current flows through the first coil 133 .

[0066] Similarly, if Figure 1 As shown in Figure (a), when the DC contactor is in the disconnected state, if the DC contactor needs to be closed, the second coil 134 is powered to generate a changing magnetic field at the second coil 134. The changing magnetic field passes through the metal body 132, and eddy currents are induced in the metal body 132, thereby generating a repulsive force between the second coil 134 and the metal body 132. Under the action of the repulsive force, the metal body 132 will drive the moving contact 121 to move upward. In the process of the metal body 132 moving upward, at the beginning, the elastic force of the elastic component 135 will become the resistance when the metal body 132 moves upward. When one end of the elastic component 135 connected to the metal body 132 or the driving rod 131 is higher than the other end, the elastic force of the elastic component 135 will become the thrust when the metal body 132 moves upward. Finally, under the elastic force of the elastic component 135, the self-weight of the three rigidly connected metal body 132, the driving rod 131 and the moving contact 121 is overcome, so that the DC contactor is maintained in a closed state. At this time, no current flows through the second coil 134 .

[0067] The utility model adopts the above technical solution, the first coil and the second coil are respectively located above and below the metal body, and when the DC contactor maintains any state, the corresponding coil can be powered, so that the coil generates a force to push the metal body to move, and then the metal body drives the moving contact to move, so as to change the state of the DC contactor. Since the elastic component is always in a compressed state, when the moving contact stops moving, the moving contact can continue to maintain the current state due to the elastic force of the elastic component, that is, the utility model maintains the on-off state of the DC contactor through the elastic force of the elastic component, and therefore, the utility model can reduce the power consumption of the DC contactor.

[0068] Furthermore, since the elastic force of the elastic component has high stability, the utility model can also improve the stability of the on-off state of the DC contactor. In this way, the utility model can effectively avoid the situation in which the DC contactor is suddenly disconnected due to a fault in the coil power supply circuit during actual application. When the DC contactor is suddenly disconnected due to a fault during use, it is often disconnected with load, and the DC contactor has a weak arc extinguishing ability with load, which may cause arcing or even fire and explosion.

[0069] In the embodiment of the utility model, Figure 1 As shown, the second coil 134 can be a solid structure. The lower bottom surface of the metal body 132 does not have the driving rod 131 protruding. In this way, when the metal body 132 generates an impact force on the second coil 134 during the downward movement of the metal body 132, the force bearing area of ​​the impact force can be increased, and the impact force per unit area of ​​the second coil 134 can be reduced, thereby reducing the impact of the metal body 132 on the second coil 134.

[0070] Figure 2 Schematic diagram of another DC contactor provided by the embodiment of the utility model. Figure 2 As shown, the second coil 134 may also be a hollow structure, and the driving rod 131 passes through the hollow part thereof. In this way, since the first coil 133 and the second coil 134 have the same structure, production and processing are facilitated.

[0071] In the embodiment of the present invention, both the first coil 133 and the second coil 134 may be disc coils. Figure 3 It is a structural diagram of a disc coil. Figure 3 In the figure, (a) is a hollow disc coil, i.e. a concentric circle structure; (b) is a solid disc coil, i.e. a solid circle structure. Based on this, Figure 1 In the embodiment shown, the first coil 133 is Figure 3 In the concentric circle structure shown in Figure (a), the second coil 134 is Figure 3 The solid circle structure shown in Figure (b). Figure 2 In the embodiment shown, the first coil 133 and the second coil 134 are Figure 3 The concentric circle structure shown in Figure (a).

[0072] In the embodiment of the utility model, the impact can be reduced by providing a buffer device.

[0073] In a specific example, Figure 1 As shown, when the second coil 134 is a solid structure, the driving module 13 may further include: a first buffer device 137 and a second buffer device 136 .

[0074] The first buffer device 137 is disposed between the first coil 133 and the metal body 132 to mitigate the impact of the metal body 132 on the first coil 133 .

[0075] The second buffer device 136 is disposed between the second coil 134 and the metal body 132 to mitigate the impact of the metal body 132 on the second coil 134 .

[0076] In another specific example, Figure 2 As shown, when the second coil 134 is a hollow structure, the driving module 13 may further include: a third buffer device 139 and a fourth buffer device 138 .

[0077] The third buffer device 139 is disposed between the first coil 133 and the metal body 132 to mitigate the impact of the metal body 132 on the first coil 133 .

[0078] The fourth buffer device 138 is disposed between the housing 11 and the second coil 134 , and is used to mitigate the impact of the driving rod 131 on the housing 11 .

[0079] In the embodiment of the utility model, the contact module 12 may further include: an arc extinguishing device 123 .

[0080] The arc extinguishing devices 123 are arranged in a one-to-one correspondence with the static contacts 122 , and are used to extinguish the arc generated between the corresponding static contact 122 and the moving contact 121 .

[0081] like Figure 1 As shown, the number of arc extinguishing devices 123 is the same as the number of static contacts 122, and they correspond one to one with the static contacts 122. The arc extinguishing devices 123 are arranged close to the position of the corresponding static contact 122 for connecting with the moving contact 121, so that the arc extinguishing devices 123 can extinguish the arc generated between the corresponding static contact 122 and the moving contact 121.

[0082] Based on a general inventive concept, the utility model also provides a switch box, including: a first DC contactor.

[0083] The first DC contactor is the DC contactor as described above, and is connected to any one-pole transmission branch of the switch box.

[0084] The switch box of the embodiment of the utility model may further include: a second DC contactor.

[0085] The second DC contactor is the DC contactor as described above, and is connected to a transmission branch of the switch box that is different from the transmission branch where the first DC contactor is located.

[0086] The switch box of the embodiment of the utility model may further include: a first overcurrent protection device.

[0087] The first overcurrent protection device is connected to any one-pole transmission branch of the switch box.

[0088] The switch box of the embodiment of the utility model may further include: a second overcurrent protection device.

[0089] The second overcurrent protection device is connected to a transmission branch of the switch box that is different from the transmission branch where the first overcurrent protection device is located.

[0090] Here, the first overcurrent protection device may be a fuse, or other overcurrent protection devices in the prior art that can implement the present application, for example, the first overcurrent protection device may also be a thermal relay. Similarly, the second overcurrent protection device may be a fuse, or other overcurrent protection devices in the prior art that can implement the present application, for example, the second overcurrent protection device may also be a thermal relay.

[0091] In a specific example, Figure 4Schematic diagram of the structure of a switch box provided by the embodiment of the utility model. Figure 4 As shown, the switch box includes: a first DC contactor 41 , a second DC contactor 42 , a first overcurrent protection device 43 and a second overcurrent protection device 44 .

[0092] The first DC contactor 41 and the first overcurrent protection device 43 are connected to the same pole transmission branch of the switch box, and the second DC contactor 42 and the second overcurrent protection device 44 are connected to the same pole transmission branch of the switch box.

[0093] The first DC contactor 41 and the second DC contactor 42 are used to control the on / off state of the switch box, and the first overcurrent protection device 43 and the second overcurrent protection device 44 are used to provide overcurrent protection to improve the safety of the switch box.

[0094] Based on a general inventive concept, the utility model also provides an energy storage system. Figure 5 Schematic diagram of the structure of an energy storage system provided by the embodiment of the utility model. Figure 5 As shown, the energy storage system includes: a battery system 51, a switch box 52 as described above, a power conversion system 53 and a battery control unit 54.

[0095] The battery system 51 is connected to the DC side of the power conversion system 53 through the switch box 52. The circuit loop formed by the battery system 51, the switch box 52 and the power conversion system 53 serves as the main power loop of the energy storage system.

[0096] The output end of the battery control unit 54 is respectively connected to the coils of each DC contactor in the switch box 52. The battery control unit 54 is used to control the on-off state of each DC contactor in the switch box 52 to control the battery system 51 to connect to the energy storage system or disconnect from the energy storage system.

[0097] As can be seen from the above content, the DC contactor of the utility model has the advantages of low power consumption and high stability of the on-off state. Therefore, when the DC contactor of the utility model is applied to the energy storage system of the utility model, the auxiliary power consumption of the energy storage system during operation can be reduced. In addition, during the operation of the energy storage system of the utility model, it is not easy for the DC contactor to suddenly disconnect automatically, thereby avoiding arcing or even fire and explosion caused by the disconnection of the DC contactor under load to a certain extent.

[0098] In the embodiment of the utility model, the battery control unit 54 may specifically include: a control circuit 541 and a coil power supply circuit 542 .

[0099] The control circuit 541 is connected to the input end of the coil power supply circuit 542 .

[0100] The output end of the coil power supply circuit 542 is connected to the coils of each DC contactor in the switch box 52 .

[0101] In actual application, the control circuit 541 can control the power supply state of the coil power supply circuit 542, and the coil power supply circuit 542 can supply power to the first coil 133 and the second coil 134 in the DC contactor, so that the control circuit 541 can control the on and off state of the DC contactor by controlling the coil power supply circuit 542 to supply power to the first coil 133 or the second coil 134 in the DC contactor.

[0102] In the embodiment of the utility model, the coil power supply circuit 542 can be a pulse circuit, and more specifically, the pulse circuit can be an LC oscillator circuit. The LC oscillator circuit is also called a resonant circuit, a tank circuit or a tuned circuit, and is a circuit composed of an inductor (L) and a capacitor (C). Here, when the capacitor in the LC oscillator circuit is discharged, it can provide a pulse current to the coil of the DC contactor.

[0103] In the embodiment of the utility model, the battery control unit 54 may further include: a detection circuit 543 .

[0104] The input end of the detection circuit 543 obtains a detection signal for determining whether the DC contactor is on or off, and the output end of the detection circuit 543 outputs a signal representing the on or off condition of the DC contactor to the control circuit 541 .

[0105] Specifically, the battery control unit 54 may be connected to an auxiliary system of the energy storage system, wherein the auxiliary system includes a local controller and a power supply. The power supply supplies power to the battery control unit 54 and the local controller, and the local controller is used to monitor the operation of the energy storage system.

[0106] During the actual operation of the energy storage system, in the initial state, the DC contactor is in a disconnected state. When the local controller determines that the battery system 51 needs to be connected, the local controller sends a first control instruction to the battery control unit 54, wherein the first control instruction is used to make the battery control unit 54 control the DC contactor to close so that the battery system 51 is connected to the energy storage system. The battery control unit 54 continuously determines whether it has received the control instruction sent by the local controller. After the battery control unit 54 receives the first control instruction, the detection circuit 543 obtains the detection signal for the connection judgment of the DC contactor, and outputs the connection condition characterization signal of the DC contactor to the control circuit 541. Among them, the detection signal for connection judgment is used to determine whether the current state of the energy storage system meets the conditions for connecting to the battery system 51. The conditions are prior art, including: the energy storage system has no faults, the voltage of the battery system 51 meets the corresponding DC side working voltage of the energy storage converter, and the difference between the voltage of the battery system 51 and the corresponding DC bus voltage is less than a preset threshold, etc., wherein the preset threshold can be equal to 10V. When the current state of the energy storage system does not meet the conditions for connecting to the battery system 51, the battery control unit 54 determines whether the current state of the energy storage system meets the conditions for connecting to the battery system 51; when the current state of the energy storage system meets the conditions for connecting to the battery system 51, the control circuit 541 controls the coil power supply circuit 542 to supply power to the second coils 134 of all DC contactors based on the connection condition characterization signal output by the detection circuit 543, so that all DC contactors are closed and the energy storage system starts to operate.

[0107] It should be noted that the on-off determination detection signal of the DC contactor includes the on-determination detection signal of the DC contactor, and the on-off condition characterization signal of the DC contactor includes the on-condition characterization signal of the DC contactor.

[0108] Similarly, during the operation of the energy storage system, when the local controller determines that the battery system 51 needs to be disconnected, the local controller sends a second control instruction to the battery control unit 54, wherein the second control instruction is used to make the battery control unit 54 control the DC contactor to disconnect, so as to disconnect the battery system 51 from the energy storage system. The battery control unit 54 continuously determines whether it has received the control instruction sent by the local controller. After the battery control unit 54 receives the second control instruction, the detection circuit 543 obtains the detection signal for the disconnection judgment of the DC contactor, and outputs the disconnection condition characterization signal of the DC contactor to the control circuit 541. Among them, the detection signal for disconnection judgment is used to determine whether the current state of the energy storage system meets the conditions for disconnecting the battery system 51. The conditions are prior art, including: whether the corresponding energy storage converter is shut down, and whether the current in the main power circuit is reduced to 0, etc. When the current state of the energy storage system does not meet the conditions for disconnecting the battery system 51, the battery control unit 54 executes the step of determining whether the current state of the energy storage system meets the conditions for disconnecting the battery system 51; when the current state of the energy storage system meets the conditions for disconnecting the battery system 51, the control circuit 541 controls the coil power supply circuit 542 to supply power to the first coils 133 of all DC contactors based on the disconnection condition characterization signal output by the detection circuit 543, so that all DC contactors are disconnected and the energy storage system stops running.

[0109] It should be noted that the detection signal for on-off determination of the DC contactor includes the detection signal for disconnection determination of the DC contactor, and the on-off condition characterization signal of the DC contactor includes the disconnection condition characterization signal of the DC contactor.

[0110] Figure 6 Schematic diagram of another energy storage system provided by the embodiment of the utility model. Figure 6 As shown, the battery control unit 54 may be integrated into the switch box 52 .

[0111] Figure 7 Schematic diagram of another energy storage system provided by the embodiment of the utility model. Figure 7 As shown, the battery control unit 54 can also be integrated into an auxiliary system 55 of the energy storage system.

[0112] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other. The modules and submodules in the devices and terminals of each embodiment of the utility model can be merged, divided and deleted according to actual needs, and the features recorded in each embodiment can be replaced or combined.

[0113] In the several embodiments provided by the present utility model, it should be understood that the disclosed terminals and devices can be implemented in other ways. For example, the division of modules or submodules is only a logical function division, and there may be other division methods in actual implementation, such as multiple submodules or modules can be combined or integrated into another module, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0114] The modules or submodules described as separate components may or may not be physically separated, and the components of the modules or submodules may or may not be physical modules or submodules, that is, they may be located in one place, or they may be distributed on multiple network modules or submodules. Some or all of the modules or submodules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0115] In addition, each functional module or sub-module in each embodiment of the present invention may be integrated into one processing module, or each module or sub-module may exist physically separately, or two or more modules or sub-modules may be integrated into one module.

[0116] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the elements.

[0117] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A DC contactor, characterized in that: include: A housing, and a contact module and a drive module arranged inside the housing; wherein, The contact module comprises: a moving contact and a stationary contact; The driving module comprises: a driving rod, a metal body, a first coil, a second coil and at least two elastic components; The metal body is rigidly connected to the moving contact through the driving rod; The first coil is located above the metal body and is a hollow structure, and the driving rod passes through the hollow part thereof; The second coil is located below the metal body; One end of each elastic component is installed on the same horizontal plane of the side between the first coil and the second coil, and the other end is installed on the side of the metal body or the driving rod, and is always in a compressed state.

2. The DC contactor according to claim 1, characterized in that: The second coil is a solid structure.

3. The DC contactor according to claim 2, characterized in that: The driving module further includes: a first buffer device and a second buffer device; The first buffer device is arranged between the first coil and the metal body, and is used to mitigate the impact of the metal body on the first coil; The second buffer device is arranged between the second coil and the metal body, and is used to mitigate the impact of the metal body on the second coil.

4. The DC contactor according to claim 1, characterized in that: The second coil is a hollow structure, and the driving rod passes through the hollow portion thereof.

5. The DC contactor according to claim 4, characterized in that: The driving module further includes: a third buffer device and a fourth buffer device; The third buffer device is disposed between the first coil and the metal body, and is used to mitigate the impact of the metal body on the first coil; The fourth buffer device is arranged between the shell and the second coil, and is used to mitigate the impact of the driving rod on the shell.

6. The DC contactor according to any one of claims 1 to 5, characterized in that: The contact module further includes: an arc extinguishing device; The arc extinguishing device is arranged in a one-to-one correspondence with the static contact, and is used to extinguish the arc generated between the corresponding static contact and the moving contact.

7. The DC contactor according to any one of claims 1 to 5, characterized in that: The number of the elastic components is 2, 3 or 4.

8. A switch box, characterized in that: include: The first DC contactor; The first DC contactor is a DC contactor as claimed in any one of claims 1 to 7, and is connected to any one-pole transmission branch of the switch box.

9. The switch box according to claim 8, characterized in that: Also included: a second DC contactor; The second DC contactor is a DC contactor according to any one of claims 1 to 7, and is connected to a transmission branch of the switch box that is different from the transmission branch where the first DC contactor is located.

10. The switch box according to claim 8 or 9, characterized in that: Also includes: a first overcurrent protection device; The first overcurrent protection device is connected to any one-pole transmission branch of the switch box.

11. The switch box according to claim 10, characterized in that: Also includes: a second overcurrent protection device; The second overcurrent protection device is connected to a transmission branch of the switch box that is different from the transmission branch where the first overcurrent protection device is located.

12. An energy storage system, characterized in that: include: A battery system, a switch box, a power conversion system and a battery control unit according to any one of claims 8 to 11; The battery system is connected to the DC side of the power conversion system through the switch box; The output ends of the battery control unit are respectively connected to the coils of the DC contactors in the switch box.

13. The energy storage system according to claim 12, characterized in that: The battery control unit comprises: a control circuit and a coil power supply circuit; The control circuit is connected to the input end of the coil power supply circuit; The output end of the coil power supply circuit is connected to the coil.

14. The energy storage system according to claim 13, characterized in that: The battery control unit further comprises: a detection circuit; The input end of the detection circuit obtains a detection signal for determining the on / off condition of the DC contactor, and the output end of the detection circuit outputs an on / off condition characterization signal of the DC contactor to the control circuit.

15. The energy storage system according to any one of claims 12 to 14, characterized in that: The battery control unit is integrated into the switch box; or, The battery control unit is integrated into an auxiliary system of the energy storage system.

Images