bdu

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a BDU. The BDU comprises a shell, a main positive contactor structure, a main negative contactor structure and a PCB, the main positive contactor structure, the main negative contactor structure and the PCB are arranged in the shell, the main positive contactor structure comprises a first driving assembly, a first static contact assembly and a first moving contact assembly, the first static contact assembly is fixed on the shell, and the first moving contact assembly is fixed on the shell. The first moving contact assembly can be driven by the first driving assembly to reciprocate; the main negative contactor structure comprises a second driving assembly, a second static contact assembly and a second moving contact assembly, the second static contact assembly is fixed on the shell, and the second moving contact assembly can be driven by the second driving assembly to reciprocate. The main positive contactor structure and the main negative contactor structure are arranged in the same shell, and the main positive contactor structure and the main negative contactor structure are independently controlled and can be respectively switched on and off to form a double-pole contactor, so that the occupied space of the double-pole contactor is reduced, and the volume of the BDU is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a BDU. Background Art

[0002] In new energy vehicles, BDU (Battery Disconnect Unit) is a high-voltage and high-current distribution unit of the battery system. BDU is connected between the battery and the load. Among them, the main positive relay and the main negative relay are essential electrical switch components connected to the power supply in BDU. The main positive relay is connected to the positive circuit between the battery and the load, and the main negative relay is connected to the negative circuit between the battery and the load. When the main positive relay and the main negative relay are closed, BDU is turned on, and a conductive loop is formed between the battery and the load, so that the power supply supplies power to the load.

[0003] The battery pack of new energy vehicles is high voltage. When the main positive relay and the main negative relay are directly closed, high voltage and large current will flow through, and arcs will be generated at the contacts, damaging the devices. Therefore, a pre-charge contactor is added to the BDU. The pre-charge relay is connected in parallel with the main positive relay to pre-charge the voltage at the load end before the main positive relay is turned on and off, so as to reduce the voltage at both ends when the main positive relay is turned on and off, and avoid arcs when the main positive relay and the main negative relay are turned on and off.

[0004] The BDU in the prior art generally includes a base, an upper shell, and a main positive relay, a main negative relay, a pre-charge relay, a busbar, a fuse, etc. installed in a cavity formed by the base and the upper shell. The main positive relay and the main negative relay are basically single-pole relays, which results in a large space being occupied. The BDU is large in size, low in integration, not compact enough, and high in cost. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a BDU in view of the problem that the main positive relay and the main negative relay of the existing BDU are single-pole relays, which leads to the BDU being large in size, not compact enough and having high cost.

[0006] To solve the above technical problems, an embodiment of the present invention provides a BDU, which is used to be connected between a battery and a load, and includes a housing, a main positive contactor structure, a main negative contactor structure and a PCB board, wherein the main positive contactor structure, the main negative contactor structure and the PCB board are arranged in the housing, and the PCB board includes a control module, and the main positive contactor structure includes a first drive component, a first static contact component and a first moving contact component, wherein the first static contact component is fixed on the housing, and the first moving contact component can reciprocate under the drive of the first drive component to contact or separate from the first static contact component, so that the main positive contact structure is connected or disconnected;

[0007] The main negative contactor structure comprises a second drive assembly, a second static contact assembly and a second moving contact assembly, wherein the second static contact assembly is fixed to the housing, and the second moving contact assembly can reciprocate under the drive of the second drive assembly to contact or separate from the second static contact assembly, so as to connect or disconnect the main negative contactor structure;

[0008] The first stationary contact assembly and the second stationary contact assembly are used to connect a battery and a load.

[0009] Optionally, a positive circuit and a negative circuit are provided between the battery and the load; the positive circuit is connected to the positive terminal of the battery and the positive terminal of the load, and the negative circuit is connected to the negative terminal of the battery and the negative terminal of the load; the main positive contactor structure is used to be connected to the positive circuit, and the main negative contactor structure is used to be connected to the negative circuit.

[0010] Optionally, the control module is connected in parallel with the main positive contactor structure, and after the main negative contactor structure is connected and before the main positive contactor structure is connected, the control module can pre-charge the voltage to limit the current when the main positive contactor structure is connected; before the main positive contactor structure is disconnected, the control module can pre-charge the voltage to limit the current when the main positive contactor structure is disconnected.

[0011] Optionally, the control module includes a current limiting resistor, a first control module, a second control module, and a first semiconductor switch and a second semiconductor switch connected at both ends of the current limiting resistor, the first control module is used to output a first control signal to control the opening and closing of the first semiconductor switch, and the second control module is used to output a second control signal to control the opening and closing of the second semiconductor switch.

[0012] Optionally, the main positive contactor structure and the main negative contactor structure are arranged in parallel in the housing, and the PCB board is fixed to a side of the main positive contactor structure facing away from the main negative contactor structure.

[0013] Optionally, the first driving assembly is used to drive the first moving contact assembly to move linearly;

[0014] The second driving assembly is used to drive the second moving contact assembly to move linearly.

[0015] Optionally, the first driving assembly includes a first reset assembly, a first static iron core, a first coil, a first moving iron core and a first push rod, the first coil is wound around the first static iron core, the first moving iron core is movably arranged relative to the first static iron core, one end of the first push rod is fixedly connected to the first moving iron core, and the other end is fixedly connected to the first moving contact assembly, and the first reset assembly can drive the first moving iron core to move in a direction away from the first static iron core when the first coil is powered off;

[0016] The second driving component includes a second reset component, a second static iron core, a second coil, a second moving iron core and a second push rod. The second coil is wound around the second static iron core. The second moving iron core is movably arranged relative to the second static iron core. One end of the second push rod is fixedly connected to the second moving iron core, and the other end is fixedly connected to the second moving contact component. The second reset component can drive the second moving iron core to move in a direction away from the second static iron core when the second coil is powered off.

[0017] Optionally, the first static iron core is an annular structure, the first coil support is fixed inside the first static iron core, the first coil is wound on the first coil support, the first moving iron core includes a first rod portion and a first plate portion, the first rod portion is passed through a central hole of the first coil support, one end of the first rod portion that passes through the first coil support in a direction away from the first moving contact assembly is connected to the first plate portion, and the first rod portion is fixedly connected to the first push rod;

[0018] The second static iron core is an annular structure, the second coil bracket is fixed inside the second static iron core, the second coil is wound on the second coil bracket, the second moving iron core includes a second rod portion and a second plate portion, the second rod portion is passed through the center hole of the second coil bracket, one end of the second rod portion passes through the second coil bracket in a direction away from the second moving contact assembly and is connected to the second plate portion, and the second rod portion is fixedly connected to the second push rod.

[0019] Optionally, the first push rod includes a first push block and two first connecting plates, the two first connecting plates are arranged in parallel and spaced apart, one end of the two first connecting plates close to the first moving contact assembly is connected to the first push block, and the first rod portion of the first moving iron core is located between the two first connecting plates and fixedly connected to the first connecting plates;

[0020] The second push rod includes a second push block and two second connecting plates. The two second connecting plates are arranged in parallel and spaced apart. One end of the two second connecting plates close to the second moving contact assembly is connected to the second push block. The second rod portion of the second moving iron core is located between the two second connecting plates and is fixedly connected to the second connecting plates.

[0021] Optionally, a first accommodating groove is provided on one side of the first push block facing the first moving contact assembly, the first moving contact assembly is accommodated in the first accommodating groove, a first reset groove is provided on the bottom wall of the first accommodating groove, the first reset assembly is installed in the first reset groove, and a first limiting portion is provided on the first push block at the top of the first accommodating groove, the first limiting portion is used to limit the first moving contact assembly from escaping from the first accommodating groove;

[0022] A second accommodating groove is provided on the side of the second push block facing the second moving contact assembly, and the second moving contact assembly is accommodated in the second accommodating groove. A second reset groove is provided on the bottom wall of the second accommodating groove, and the second reset assembly is installed in the second reset groove. A second limiting portion is provided on the second push block at the top of the second accommodating groove, and the second limiting portion is used to limit the second moving contact assembly from escaping from the second accommodating groove.

[0023] In the BDU of the present invention, the first driving component of the main positive contactor structure drives the first moving contact component to approach or move away from the first static contact component, and the second driving component of the main negative contactor structure drives the second moving contact component to approach or move away from the second static contact component, so that the main positive contactor structure and the main negative contactor structure are independently controlled and can be switched on and off respectively, and the main positive contactor structure and the main negative contactor structure are arranged in the same shell to form a double-pole contactor to reduce the space occupied by it, thereby reducing the volume of the BDU, improving the integration of the BDU, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a partial structural diagram of a BDU provided by an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A schematic diagram of the structure when the main positive contactor structure and the main negative contactor structure are connected in parallel;

[0026] Figure 3 yes Figure 1 A schematic diagram of the structure when the main positive contactor structure and the main negative contactor structure are connected in series;

[0027] Figure 4 yes Figure 1 The circuit schematic diagram of BDU;

[0028] Figure 5 yes Figure 1 Structural schematic diagram of the main positive contactor structure and the main negative contactor structure;

[0029] Figure 6 yes Figure 5 Side view in;

[0030] Figure 7 yes Figure 6 The cross-sectional view of X1-X1 in FIG.

[0031] Figure 8 yes Figure 6 The sectional view of X2-X2 in FIG.

[0032] Fig. 9 yes Figure 5A schematic structural diagram of the first push rod in FIG.

[0033] Fig.10 It is a schematic structural diagram of a BDU provided by another embodiment of the present invention when it is packaged in ceramics.

[0034] The reference numerals in the specification are as follows:

[0035] 1. Shell; 2. Main positive contactor structure; 21. First static contact assembly; 211. First static contact; 22. First moving contact assembly; 221. Second static contact; 23. First drive assembly; 231. First static iron core; 232. First moving iron core; 233. First push rod; 2331. First push block; 2332. First connecting plate; 2333. First accommodating groove; 2334. First reset groove; 234. First coil support; 235. First side spring; 236. First center spring; 3. Main negative contactor structure; 4. PCB board; 5. Ceramic shell; 51. Upper cover; 52. Side panel; 6. Plastic parts. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] like Figures 1 to 3 As shown, Figure 1 The main negative contactor structure 3 and part of the shell 1 are hidden. An embodiment of the present invention provides a BDU, which is connected between the battery and the load. The BDU includes a shell 1, a main positive contactor structure 2, a main negative contactor structure 3 and a PCB board 4. The PCB board 4, the main positive contactor structure 2 and the main negative contactor structure 3 are arranged in the shell 1 to form a double-pole contactor.

[0038] The PCB board 4 includes a control module. Compared with the traditional BDU that is provided with multiple electrical components, such as a fast charging relay, a pre-charging relay, etc., the present invention integrates other electrical components in the traditional BDU except the main positive contactor and the main negative contactor on the PCB board 4, with a high degree of integration, and the volume of the PCB board 4 is small, which can reduce the volume of the BDU. Moreover, the PCB board 4 is connected to the main positive contactor structure 2 and the main negative contactor structure 3 in the housing 1, which can avoid the use of an external interface.

[0039] like Figure 5 and Figure 6As shown, the main positive contactor structure 2 includes a first drive assembly 23, a first static contact assembly 21 and a first moving contact assembly 22. The first static contact assembly 21 is fixed on the housing 1. The first moving contact assembly 22 can reciprocate under the drive of the first drive assembly 23 to contact or separate from the first static contact assembly 21, so that the main positive contactor structure 2 is connected or disconnected. Specifically, when the first moving contact assembly 22 moves close to the first static contact assembly 21 and contacts the first static contact assembly 21, the main positive contactor structure 2 is connected, and when the first moving contact assembly 22 moves away from the first static contact assembly 21 and separates from the first static contact assembly 21, the main positive contactor structure 2 is disconnected.

[0040] The main negative contactor structure 3 includes a second drive assembly, a second static contact assembly and a second moving contact assembly. The second static contact assembly is fixed on the housing 1. The second moving contact assembly can reciprocate under the drive of the second drive assembly, and the second static contact assembly is contacted or separated, so that the main negative contactor structure 3 is connected or disconnected. Specifically, when the second moving contact assembly moves close to the second static contact assembly and contacts the second static contact assembly, the main negative contactor structure 3 is connected, and when the second moving contact assembly moves away from the second static contact assembly and separates from the second static contact assembly, the main negative contactor structure 3 is disconnected.

[0041] The first static contact assembly 21 and the second static contact assembly connect the battery and the load. After the main negative contactor structure 3 and the main positive contactor structure 2 are connected in sequence, the BDU is connected, and the battery can supply power to the load. The main positive contactor structure 2 and the main negative contactor structure 3 are disconnected in sequence, the BDU is disconnected, and the battery stops supplying power to the load.

[0042] The first stationary contact assembly 21 and the second stationary contact assembly are connected in series or in parallel. The parallel structure of the first stationary contact assembly 21 and the second stationary contact assembly is as follows: Figure 2 As shown, the series structure of the first stationary contact assembly 21 and the second stationary contact assembly is as shown in Figure 3 shown.

[0043] Since the main positive contactor structure 2 is switched on and off by the first drive assembly 23, and the main negative contactor structure 3 is switched on and off by the second drive assembly, the main positive contactor structure 2 and the main negative contactor structure 3 can be switched on and off respectively. Even if one of the main positive contactor structure 2 and the main negative contactor structure 3 is damaged, the other can still work normally to disconnect the BDU, thereby improving the safety of the BDU.

[0044] In the BDU of the present invention, the first drive component 23 of the main positive contactor structure 2 drives the first moving contact component 22 to contact or separate with the first static contact component 21, and the second drive component of the main negative contactor structure 3 drives the second moving contact component to contact or separate with the second static contact component, so that the main positive contactor structure 2 and the main negative contactor structure 3 are independently controlled and can be switched on and off respectively. The main positive contactor structure 2 and the main negative contactor structure 3 are arranged in the same housing to form a double-blade contactor, which can reduce the space occupied by the contactor, thereby reducing the volume of the BDU, improving the integration of the BDU, and reducing the cost.

[0045] In one embodiment, a positive circuit and a negative circuit are provided between the battery and the load; the positive circuit connects the positive terminal of the battery and the positive terminal of the load, and the negative circuit connects the negative terminal of the battery and the negative terminal of the load. The main positive contactor structure 2 is connected to the positive circuit, and the main negative contactor structure 3 is connected to the negative circuit.

[0046] In one embodiment, the control module is connected in parallel with the main positive contactor structure 2. After the main negative contactor structure 3 is turned on and before the main positive contactor structure 2 is turned on, the control module can pre-charge the voltage to limit the current when the main positive contactor structure 2 is turned on. Before the main positive contactor structure 2 is turned off, the control module can pre-charge the voltage to limit the current when the main positive contactor structure 2 is turned off.

[0047] Specifically, when the BDU needs to be connected, the main negative contactor structure 3 is closed first, and then the control module works. Since there is no current in the negative circuit when the main negative contactor structure 3 is closed, no arc is generated when the main negative contactor structure 3 is closed. The current passes through the control module and then outputs through the main negative contactor structure 3. When the voltage across the main positive contactor structure 2 is reduced to the set voltage, the main positive contactor structure 2 is closed again, which is equivalent to pre-charging the load end to reduce the voltage across the main positive contactor structure 2, thereby reducing the current flowing through the main positive contactor structure 2, buffering or reducing the impact of high voltage and large current on the main positive contactor structure 2, and avoiding arcing when the main positive contactor structure 2 is closed. After the main positive contactor structure 2 is closed, the control module is disconnected.

[0048] When the BDU needs to be disconnected, the control module works first, then disconnects the main positive contactor structure 2, and finally disconnects the positive and negative contactor structures to ensure that no arc is generated in the main positive contactor structure 2 and the main negative contactor structure 3.

[0049] At the same time, as long as the main negative contactor structure 3 is disconnected, the circuit cannot work normally, there is no current in the loop, and therefore there is no leakage current problem.

[0050] The set voltage is generally 5% to 10% of the power supply. The voltage of 5% to 10% of the power supply is relatively small, and the current cannot break through the air between the first static contact assembly 21 and the first moving contact assembly 22 to generate an arc.

[0051] In one embodiment, if Figure 4 As shown, the control module includes a current limiting resistor, a first control module, a second control module, and a first semiconductor switch and a second semiconductor switch connected at both ends of the current limiting resistor. The first control module is used to output a first control signal to control the opening and closing of the first semiconductor switch, and the second control module is used to output a second control signal to control the opening and closing of the second semiconductor switch.

[0052] Specifically, when the BDU needs to be connected, after the main positive contactor structure 2 is connected, the first control module sends a first control signal to control the first semiconductor switch to be disconnected, and the second control module sends a second control signal to control the second semiconductor switch to be disconnected. When the BDU needs to be disconnected, the first control module first sends a first control signal to control the first semiconductor switch to be turned on, and the second control module sends a second control signal to control the second semiconductor switch to be turned on, and then the main positive contactor structure 2 and the main negative contactor structure 3 are disconnected in sequence.

[0053] In one embodiment, the main positive contactor structure 2 and the main negative contactor structure 3 are arranged side by side in the housing 1, and the PCB board 4 is fixed on the side of the main positive contactor structure 2 facing away from the main negative contactor structure 3, so as to reasonably arrange the main positive contactor structure 2, the main negative contactor structure 3 and the PCB board 4, reduce their occupied space, and thus reduce the volume of the BDU.

[0054] In one embodiment, the PCB board can be fixed on the main positive contactor structure 2 by pin welding.

[0055] In one embodiment, the first drive assembly 23 is used to drive the first moving contact assembly 22 to move linearly; the second drive assembly is used to drive the second moving contact assembly to move linearly. The direct-acting first drive assembly 23 and the second drive assembly have a simple structure, are easy to install, have a small size, and occupy a small space, so as to further reduce the size of the BDU.

[0056] In one embodiment, if Figure 7 and Figure 8 As shown, the first driving assembly 23 includes a first reset assembly, a first static iron core 231, a first coil, a first moving iron core 232 and a first push rod 233. The first coil is wound around the first static iron core 231, and the first moving iron core 232 is movably arranged relative to the first static iron core 231. One end of the first push rod 233 is fixedly connected to the first moving iron core 232, and the other end is fixedly connected to the first moving contact assembly 22. The first reset assembly can drive the first moving iron core 232 to move in a direction away from the first static iron core 231 when the first coil is powered off.

[0057] The second drive assembly includes a second reset assembly, a second static iron core, a second coil, a second moving iron core and a second push rod. The second coil is wound around the second static iron core. The second moving iron core is movably arranged relative to the second static iron core. One end of the second push rod is fixedly connected to the second moving iron core, and the other end is fixedly connected to the second moving contact assembly. The second reset assembly can drive the second moving iron core to move away from the second static iron core when the second coil is powered off.

[0058] In one embodiment, the first static iron core 231 is an annular structure, a first coil support 234 is fixed inside the first static iron core 231, the first coil is wound on the first coil support 234, the first moving iron core 232 includes a first rod portion and a first plate portion, the first rod portion is inserted through the center hole of the first coil support 234, one end of the first rod portion that passes through the first coil support 234 in a direction away from the first moving contact assembly 22 is connected to the first plate portion, and the first rod portion is fixedly connected to the first push rod 233. The movement of the first moving iron core 232 is guided by the guide cooperation between the first rod portion and the first coil support 234, so as to improve the stability of the movement of the first moving iron core 232, thereby improving the accuracy of the contact electrical connection between the first moving contact assembly 22 and the first static contact assembly 21.

[0059] The second static iron core is an annular structure, a second coil support is fixed inside the second static iron core, the second coil is wound on the second coil support, the second moving iron core includes a second rod portion and a second plate portion, the second rod portion is inserted through the center hole of the second coil support, one end of the second rod portion that passes through the second coil support in a direction away from the second moving contact assembly is connected to the second plate portion, and the second rod portion is fixedly connected to the second push rod. The movement of the second moving iron core is guided by the guiding cooperation between the second rod portion and the second coil support, so as to improve the stability of the movement of the second moving iron core, thereby improving the accuracy of the contact electrical connection between the second moving contact assembly and the second static contact assembly.

[0060] In one embodiment, if Fig. 9 As shown, the first push rod 233 includes a first push block 2331 and two first connecting plates 2332. The two first connecting plates 2332 are arranged in parallel and spaced apart. The two first connecting plates 2332 are connected to the first push block 2331 at one end close to the first moving contact assembly 22. The first rod portion of the first moving iron core 232 is located between the two first connecting plates 2332 and is fixedly connected to the first connecting plate 2332 to increase the contact area between the first connecting plate 2332 and the first moving iron core 232, thereby improving the firmness between the first connecting plate 2332 and the first moving iron core 232.

[0061] The second push rod includes a second push block and two second connecting plates, the two second connecting plates are arranged in parallel and spaced apart, one end of the two second connecting plates close to the second moving contact assembly is connected to the second push block, and the second rod portion of the second moving iron core is located between the two second connecting plates and is fixedly connected to the second connecting plates to increase the contact area between the second connecting plates and the second moving iron core and improve the firmness between the second connecting plates and the second moving iron core.

[0062] In one embodiment, the first rod portion of the first moving iron core 232 is connected to the first connecting plate 2332 by screws, and the second rod portion of the second moving iron core is connected to the second connecting plate by screws.

[0063] In one embodiment, a first accommodating groove 2333 is provided on the side of the first push block 2331 facing the first moving contact assembly 22, the first moving contact assembly 22 is accommodated in the first accommodating groove 2333, a first reset groove 2334 is provided on the bottom wall of the first accommodating groove 2333, the first reset assembly is installed in the first reset groove 2334, and a first limiting portion is provided on the top of the first accommodating groove 2333 on the first push block 2331, and the first limiting portion is used to limit the first moving contact assembly 22 from escaping from the first accommodating groove 2333.

[0064] A second accommodating groove is provided on the side of the second push block facing the second moving contact assembly, the second moving contact assembly is accommodated in the second accommodating groove, a second reset groove is provided on the bottom wall of the second accommodating groove, the second reset assembly is installed in the second reset groove, and a second limiting portion is provided on the second push block at the top of the second accommodating groove, the second limiting portion is used to limit the second moving contact assembly from escaping from the second accommodating groove.

[0065] Compared with setting the first reset component and the second reset component outside the first push block 2331 and the second push block, the internal space of the first push block 2331 is reasonably utilized to install the first reset component and the internal space of the second push block is utilized to install the second reset component, which can avoid the first reset component and the second reset component from interfering with other parts and reduce the installation space.

[0066] In one embodiment, the first reset component and the second reset component are both compression springs.

[0067] In one embodiment, the first reset assembly includes a first side spring 235 and a first center spring 236. The first side spring 235 is distributed outside the first center spring 236. The two ends of the first side spring 235 are respectively fixed to the first moving contact assembly 22 and the first push block 2331. The bottom end of the first center spring 236 is fixed to the first push block 2331, and the top end surface of the first center spring 236 is lower than the top end surface of the first side spring 235.

[0068] When the first driving assembly 23 starts to drive the first moving contact assembly 22 to move toward the first static contact assembly 21, the first side spring 235 is compressed, and the first push rod 233 pushes the first moving contact assembly 22 to move linearly. After the first moving contact assembly 22 contacts the first static contact assembly 21, the top end of the first center spring 236 starts to press against the first moving contact assembly 22. The first moving contact assembly 22 that continues to move compresses the first center spring 236 to increase the force on the first moving contact assembly 22, so that the contact between the first moving contact assembly 22 and the first static contact assembly 21 is more firm.

[0069] The second reset assembly includes a second side spring and a second center spring, the second side spring is distributed outside the second center spring, and both ends of the second side spring are respectively fixed to the second moving contact assembly and the second push block. The bottom end of the second center spring is fixed to the second push block, and the top end surface of the second center spring is lower than the top end surface of the second side spring.

[0070] When the second driving assembly starts to drive the second moving contact assembly to move toward the second stationary contact assembly, the second side spring is compressed, and the second push rod pushes the second moving contact assembly to move linearly. After the second moving contact assembly contacts the second stationary contact assembly, the top end of the second center spring starts to rest against the second moving contact assembly, and the second moving contact assembly that continues to move compresses the second center spring to increase the force on the second moving contact assembly, thereby making the contact between the second moving contact assembly and the second stationary contact assembly more firm.

[0071] In one embodiment, two first side springs 235 are provided, and one first center spring 236 is provided. The two first side springs 235 are symmetrically distributed about the first center spring 236. Accordingly, three first reset grooves 2334 adapted to the first side springs 235 and the first center spring 236 are provided on the first push block 2331. The first reset grooves 2334 are used to guide the first reset assembly to improve the stability of the first reset assembly.

[0072] In one embodiment, two second side springs are provided and one second center spring is provided, and the two second side springs are symmetrically distributed about the second center spring. Accordingly, three second reset grooves adapted to the second side springs and the second center spring are provided on the second push block, and the second reset grooves are used to guide the second reset assembly to improve the stability of the second reset assembly.

[0073] In one embodiment, the first static contact assembly 21 includes two first static copper bars distributed at intervals, and the first static copper bar is provided with a first static contact 211 on one side facing the first moving contact assembly 22. The first moving contact assembly 22 is a first moving copper bar, and the first moving copper bar is provided with two first moving contacts 221 distributed corresponding to the first static contacts 211 on one side facing the first static contact assembly 21, and the first moving contact 221 is used to contact and electrically connect with the first static contact 211.

[0074] The second static contact assembly includes two second static copper bars distributed at intervals, and a second static contact is arranged on the side of the second static copper bar facing the second moving contact assembly. The second moving contact assembly is a second moving copper bar, and two second moving contacts corresponding to the second static contacts are arranged on the side of the second moving copper bar facing the second static contact assembly, and the second moving contact is used to contact and electrically connect with the second static contact.

[0075] In one embodiment, the structure of the second static copper bar is the same as that of the first static copper bar, and the structure is described by taking the first static copper bar as an example. The first static copper bar includes a fixed section and a connecting section formed by horizontally bending and extending one end of the fixed section toward the direction close to the first moving copper bar, the fixed section is fixedly connected to the housing 1, and the first static contact 211 is installed on the connecting section.

[0076] In other embodiments, the PCB board 4 may be fixed on the housing 1 , or may be fixed on the top of the main positive contactor structure 2 and the main negative contactor structure 3 .

[0077] In other embodiments, the current limiting resistor, the first control module, the second control module, the first semiconductor switch and the second semiconductor switch may be eliminated. To avoid arcing when the main positive contactor structure 2 and the main negative contactor structure 3 are switched on and off, arc extinguishing may be performed through ceramic packaging.

[0078] like Fig.10 As shown, the ceramic package refers to sealing the first static contact assembly 21 and the first moving contact assembly 22 of the main positive contactor structure 2, and the second static contact assembly and the second moving contact assembly of the main negative contactor structure 3 in the ceramic housing 5. The ceramic housing 5 is a shell structure with an opening facing downwards, which is surrounded by two side plates 52, a front cover plate, a rear cover plate and an upper cover 51. The lower end cover of the ceramic housing 5 is arranged on the top of the first static iron core 231 and the second static iron core to form a closed space. The ceramic housing 5 is in a vacuum state or filled with inert gas to avoid arcing when the main positive contactor structure 2 and the main negative contactor structure 3 are turned on and off.

[0079] During packaging, the left and right side plates 52 are installed first, and then the front and rear cover plates are installed, and they are sealed and fixed by a specific welding method, and the gaps in contact with the first static iron core 231 and the second static iron core below are also sealed in the same way. Then, a certain amount of inert gas is filled into the ceramic shell 5 or vacuumed, and then the upper cover 51 is covered and welded to complete the ceramic sealing of the contacts.

[0080] Ceramic packaging technology is well known in the art and will not be described in detail here.

[0081] When the first static copper bar of the first static contact assembly 231 is C-shaped and the second static copper bar of the second static contact assembly is C-shaped, the bending parts of the first static copper bar and the second static copper bar need to be fixed by the plastic part 6 to prevent the first static copper bar and the second static copper bar from deforming. Therefore, corresponding avoidance holes and avoidance grooves need to be reserved on the side plate 52, and the part of the plastic part 6 located outside the ceramic shell 5 serves as a positioning part for the installation of the main positive contactor structure 2 and the main negative contactor structure 3, which is convenient for the installation of the main positive contactor structure 2, the main negative contactor structure 3 and the shell 1.

[0082] In other embodiments, the first driving assembly 23 can drive the first moving contact assembly 22 to reciprocate and rotate, so as to realize the connection and disconnection of the first moving contact assembly 22 and the first stationary contact assembly 21. For example, the first driving assembly 23 includes an excitation coil, an iron core, a rotating shaft, and an armature that can rotate around the rotating shaft. The first moving contact assembly 22 is fixed to the rotating end of the armature. When the excitation coil is energized, the iron core magnetically attracts the armature to rotate around the rotating shaft, so that the first moving contact assembly 22 is in contact with the first stationary contact assembly 21.

[0083] The second driving assembly may have the same structure as the first driving assembly 23 .

[0084] In other embodiments, the first moving iron core 232 may include only a first plate portion, the first plate portion is located on a side of the first stationary iron core 231 close to the first moving contact assembly 22, and the side of the first plate portion close to the first moving contact assembly 22 is fixedly connected to the first push rod 233. In this case, the first coil may be wound around the outer circumference of the first stationary iron core 231.

[0085] The structure of the second moving iron core may be the same as that of the first moving iron core 232 .

[0086] In other embodiments, the first push rod 233 may only include a first push block 2331, and the first rod portion of the first moving iron core 232 passes through the center hole of the first coil support 234 in a direction close to the first moving contact assembly 22, and the first push block 2331 is fixedly connected to the first rod portion of the first moving iron core 232.

[0087] The structure of the second push rod may be the same as that of the first push rod 233 .

[0088] In other embodiments, the compression spring may be disposed on the outside of the first push block 2331, and the first reset assembly may be fixed between the first push block 2331 and the first static iron core 231. Of course, the first reset assembly may also be a tension spring, and the two ends of the tension spring are respectively fixed to the inner wall of the housing 1 and the bottom end of the first movable iron core 232.

[0089] The structure of the second reset component may be the same as that of the first reset component.

[0090] In other embodiments, the first moving contact assembly 22 may include a first guide rod and a spring contact finger sleeved on the end of the first guide rod, and the first static contact assembly 21 may include a first guide sleeve having a first guide hole for inserting the first guide rod, and after the first guide rod is inserted into the first guide hole, the spring contact finger contacts and is electrically connected to the hole wall of the first guide hole.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A BDU, characterized in that: Used to be connected between a battery and a load, comprising a housing (1), a main positive contactor structure (2), a main negative contactor structure (3) and a PCB board (4), wherein the main positive contactor structure (2), the main negative contactor structure (3) and the PCB board (4) are arranged in the housing (1), the PCB board (4) comprises a control module, the main positive contactor structure (2) comprises a first drive component (23), a first static contact component (21) and a first moving contact component (22), the first static contact component (21) is fixed on the housing (1), and the first moving contact component (22) can reciprocate under the drive of the first drive component (23) to contact or separate from the first static contact component (21), so as to connect or disconnect the main positive contactor structure (2); The main negative contactor structure (3) comprises a second drive assembly, a second static contact assembly and a second moving contact assembly, wherein the second static contact assembly is fixed to the housing (1), and the second moving contact assembly can reciprocate under the drive of the second drive assembly to contact or separate from the second static contact assembly, so as to connect or disconnect the main negative contactor structure (3); The first stationary contact assembly (21) and the second stationary contact assembly are used to connect a battery and a load.

2. The BDU according to claim 1, characterized in that: A positive circuit and a negative circuit are provided between the battery and the load; the positive circuit is connected to the positive end of the battery and the positive end of the load, and the negative circuit is connected to the negative end of the battery and the negative end of the load; the main positive contactor structure (2) is used to be connected to the positive circuit, and the main negative contactor structure (3) is used to be connected to the negative circuit.

3. The BDU according to claim 1, characterized in that: The control module is connected in parallel with the main positive contactor structure (2), and after the main negative contactor structure (3) is turned on and before the main positive contactor structure (2) is turned on, the control module can pre-charge the voltage to limit the current when the main positive contactor structure (2) is turned on; Before the main positive contactor structure (2) is disconnected, the control module can pre-charge the voltage to limit the current when the main positive contactor structure (2) is disconnected.

4. The BDU according to claim 3, characterized in that: The control module includes a current limiting resistor, a first control module, a second control module, and a first semiconductor switch and a second semiconductor switch connected at both ends of the current limiting resistor. The first control module is used to output a first control signal to control the opening and closing of the first semiconductor switch, and the second control module is used to output a second control signal to control the opening and closing of the second semiconductor switch.

5. The BDU according to claim 1, characterized in that: The main positive contactor structure (2) and the main negative contactor structure (3) are arranged in parallel in the housing (1), and the PCB board (4) is fixed on a side of the main positive contactor structure (2) facing away from the main negative contactor structure (3).

6. The BDU according to claim 1, characterized in that: The first driving assembly (23) is used to drive the first moving contact assembly (22) to move linearly; The second driving assembly is used to drive the second moving contact assembly to move linearly.

7. The BDU according to claim 6, characterized in that: The first driving assembly (23) comprises a first reset assembly, a first static iron core (231), a first coil, a first moving iron core (232) and a first push rod (233); the first coil is wound around the first static iron core (231); the first moving iron core (232) is movably arranged relative to the first static iron core (231); one end of the first push rod (233) is fixedly connected to the first moving iron core (232), and the other end is fixedly connected to the first moving contact assembly (22); the first reset assembly can drive the first moving iron core (232) to move in a direction away from the first static iron core (231) when the first coil is powered off; The second driving component includes a second reset component, a second static iron core, a second coil, a second moving iron core and a second push rod. The second coil is wound around the second static iron core. The second moving iron core is movably arranged relative to the second static iron core. One end of the second push rod is fixedly connected to the second moving iron core, and the other end is fixedly connected to the second moving contact component. The second reset component can drive the second moving iron core to move in a direction away from the second static iron core when the second coil is powered off.

8. The BDU according to claim 7, characterized in that: The first static iron core (231) is an annular structure, the first coil support (234) is fixed inside the first static iron core (231), the first coil is wound on the first coil support (234), the first moving iron core (232) comprises a first rod portion and a first plate portion, the first rod portion is inserted through a central hole of the first coil support (234), one end of the first rod portion that passes through the first coil support (234) in a direction away from the first moving contact assembly (22) is connected to the first plate portion, and the first rod portion is fixedly connected to the first push rod (233); The second static iron core is an annular structure, the second coil bracket is fixed inside the second static iron core, the second coil is wound on the second coil bracket, the second moving iron core includes a second rod portion and a second plate portion, the second rod portion is passed through the center hole of the second coil bracket, one end of the second rod portion passes through the second coil bracket in a direction away from the second moving contact assembly and is connected to the second plate portion, and the second rod portion is fixedly connected to the second push rod.

9. The BDU according to claim 8, characterized in that: The first push rod (233) comprises a first push block (2331) and two first connecting plates (2332), the two first connecting plates (2332) are arranged in parallel and spaced apart, one end of the two first connecting plates (2332) close to the first moving contact assembly (22) is connected to the first push block (2331), and the first rod portion of the first moving iron core (232) is located between the two first connecting plates (2332) and is fixedly connected to the first connecting plates (2332); The second push rod includes a second push block and two second connecting plates. The two second connecting plates are arranged in parallel and spaced apart. One end of the two second connecting plates close to the second moving contact assembly is connected to the second push block. The second rod portion of the second moving iron core is located between the two second connecting plates and is fixedly connected to the second connecting plates.

10. The BDU according to claim 9, characterized in that: A first accommodating groove (2333) is provided on one side of the first pushing block (2331) facing the first moving contact assembly (22), the first moving contact assembly (22) is accommodated in the first accommodating groove (2333), a first reset groove (2334) is provided on the bottom wall of the first accommodating groove (2333), the first reset assembly is installed in the first reset groove (2334), and a first limiting portion is provided on the first pushing block (2331) at the top of the first accommodating groove (2333), the first limiting portion is used to limit the first moving contact assembly (22) from escaping from the first accommodating groove (2333); A second accommodating groove is provided on the side of the second push block facing the second moving contact assembly, and the second moving contact assembly is accommodated in the second accommodating groove. A second reset groove is provided on the bottom wall of the second accommodating groove, and the second reset assembly is installed in the second reset groove. A second limiting portion is provided on the second push block at the top of the second accommodating groove, and the second limiting portion is used to limit the second moving contact assembly from escaping from the second accommodating groove.

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