A fuel cell hydrogen energy vehicle auxiliary energy system

Abstract

The present invention relates to the field of hydrogen energy vehicle technology, and in particular to a fuel cell hydrogen energy vehicle auxiliary energy system. The system includes a housing, a control board, a power board, a super capacitor module, a bidirectional DC module and a power battery module; the control board, the power board, the super capacitor module, the bidirectional DC module and the power battery module are all integrated in the housing, the control board and the power board are electrically connected, and the super capacitor module, the bidirectional DC module and the power battery module are all integrated on the power board. The auxiliary energy system of the present invention combines the original super capacitor system, the bidirectional DC and the power battery into a hybrid auxiliary energy system. Compared with the three separate systems, the volume and weight of the auxiliary energy system are significantly reduced, which saves a lot of layout space for hydrogen energy vehicles, significantly reduces the production cost of hydrogen energy vehicles, improves economic performance, and has the advantages of strong high-voltage safety performance and strong practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen energy vehicles, and in particular to an auxiliary energy system for a fuel cell hydrogen energy vehicle. Background Art

[0002] With the popularization and promotion of hydrogen fuel new energy vehicles, hydrogen fuel vehicles have received widespread attention worldwide. Since hydrogen energy vehicles are emerging technology products, many unique related products have been born, among which hybrid auxiliary energy solutions are used as solutions to improve the power and driving range of hydrogen energy vehicles. However, the existing separate hybrid auxiliary energy system has many problems such as large size, high cost, and complex structural design. Summary of the invention

[0003] In view of this, the present invention provides a fuel cell hydrogen energy vehicle auxiliary energy system.

[0004] The present invention provides a fuel cell hydrogen energy vehicle auxiliary energy system, a control board, a power board, a super capacitor module, a bidirectional DC module, a power battery module, the first copper busbar and the second copper busbar;

[0005] The control board is electrically connected to the power board, and the super capacitor module, the bidirectional DC module and the power battery module are all integrated on the power board;

[0006] The supercapacitor module includes a first capacitor monomer, a second capacitor monomer, a pre-charge circuit fuse, a supercapacitor negative electrode contactor, a supercapacitor positive electrode contactor, a pre-charge contactor and a pre-charge resistor;

[0007] The bidirectional DC module includes a buck-boost module, an input-side pre-charge capacitor and an output-side pre-charge capacitor;

[0008] The power battery module includes a first power battery, a second power battery, a second MBD switch, a power battery main negative contactor, a power battery circuit fuse, a power battery main positive contactor, a power battery pre-charge contactor, a power battery pre-charge resistor and a third copper busbar;

[0009] The first capacitor monomer is connected in series with the second capacitor monomer, the positive electrode of the second capacitor monomer is electrically connected to the positive electrode of the pre-charging circuit fuse, the negative electrode of the pre-charging circuit fuse is electrically connected to one end of the pre-charging contactor, the other end of the pre-charging contactor is electrically connected to the positive electrode of the pre-charging resistor, one end of the supercapacitor positive electrode contactor is electrically connected to one end of the pre-charging contactor, and the other end is electrically connected to the negative electrode of the pre-charging resistor, one end of the supercapacitor negative electrode contactor is electrically connected to the negative electrode of the first capacitor monomer, the negative electrode of the first copper busbar is electrically connected to the other end of the supercapacitor negative electrode contactor, the negative electrode of the input side pre-charging capacitor and the second high-voltage input end of the buck-boost module, and the positive electrode thereof is electrically connected to the negative electrode of the pre-charging resistor and the first high-voltage input end of the buck-boost module, and the positive and negative electrodes of the output side pre-charging capacitor are electrically connected to the first high-voltage output end and the second high-voltage output end of the buck-boost module respectively;

[0010] The first power battery, the second MBD switch, the third copper busbar and the second power battery are connected in series in sequence, one end of the power battery pre-charging contactor is electrically connected to the positive electrode of the first power battery, and the other end thereof is electrically connected to the positive electrode of the power battery pre-charging resistor, one end of the power battery main positive contactor is electrically connected to the positive electrode of the first power battery, and the other end thereof is electrically connected to the negative electrode of the power battery pre-charging resistor, one end of the power battery main negative contactor is electrically connected to the negative electrode of the second power battery, and the other end thereof is electrically connected to the negative electrode of the power battery circuit fuse, the negative electrode of the second copper busbar is respectively electrically connected to the positive electrode of the power battery circuit fuse and the negative electrode of the output side pre-charging capacitor, and the positive electrode thereof is respectively electrically connected to the negative electrode of the power battery pre-charging resistor and the positive electrode of the output side pre-charging capacitor.

[0011] Furthermore, it also includes a shell, the control board, the power board, the super capacitor module and the bidirectional DC module are all integrated in the shell, the control board has a low-voltage input end, and the shell is provided with a low-voltage power socket, the first MBD switch, the second MBD switch and a high-voltage output interface, the first low-voltage power socket is electrically connected to the low-voltage input end, and the high-voltage output interface is electrically connected to the first high-voltage output end and the second high-voltage output end of the buck-boost module respectively.

[0012] Furthermore, explosion-proof breathing valves are provided on opposite sides of the shell.

[0013] Furthermore, a coolant water pipe is provided inside the shell, and the coolant water pipe is laid under the power board. A coolant inlet and a coolant outlet are provided on the shell, wherein the coolant inlet is connected to one end of the coolant water pipe, and the coolant outlet is connected to the other end of the coolant water pipe.

[0014] The technical solution provided by the present invention has the following beneficial effects: the auxiliary energy system of the present invention integrates and optimizes the power boards and control boards of the original supercapacitor system and the bidirectional DC, and finally integrates a power board and a control board, effectively realizing the integration and optimization of system functions, and also significantly reducing the overall volume of the auxiliary energy, and significantly improving the convenience of auxiliary energy installation, which is suitable for the compact installation of hydrogen energy vehicles. In addition, after the original supercapacitor system and the bidirectional DC of the auxiliary energy system of the present invention are integrated, the number of high-voltage wire harnesses and other hardware materials used are significantly reduced, and the production cost and installation cost are significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a circuit diagram of a fuel cell hydrogen energy vehicle auxiliary energy system according to the present invention;

[0016] Figure 2 It is a structural schematic diagram of a fuel cell hydrogen energy vehicle auxiliary energy system according to the present invention;

[0017] Figure 3 It is a structural schematic diagram of a fuel cell hydrogen energy vehicle auxiliary energy system according to the present invention;

[0018] Figure 4 It is a structural schematic diagram of a fuel cell hydrogen energy vehicle auxiliary energy system according to the present invention.

[0019] In the figure: 10-housing, 11-low-voltage power socket, 13-first MBD switch, 14-high-voltage output interface, 20-control board, 21-first low-voltage input terminal, 22-second low-voltage input terminal, 23-CAN communication interface, 30-power board, 40-supercapacitor module, 41-first capacitor monomer, 42-second capacitor monomer, 43-pre-charge circuit insurance, 44-supercapacitor negative contactor, 45-supercapacitor positive contactor, 46-pre-charge contactor, 47-pre-charge resistor, 50-bidirectional DC module, 51-boost module, 52-input side pre-charge capacitor, 5 3- output side pre-charge capacitor, 60- first copper busbar, 70- power battery module, 71- first power battery, 72- second power battery, 73- second MBD switch, 74- power battery main negative contactor, 75- power battery circuit insurance, 76- power battery main positive contactor, 77- power battery pre-charge contactor, 78- power battery pre-charge resistor, 79- third copper busbar, 80- needle row, 90- pressure relief valve, 100- coolant water pipe, 101- coolant inlet, 102- coolant outlet, 110- second copper busbar, 120- explosion-proof breathing valve, 130- grounding harness. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0021] Please refer to Figure 1-4 , an embodiment of the present invention provides a fuel cell hydrogen energy vehicle auxiliary energy system, including a housing 10, a control board 20, a power board 30, a super capacitor module 40, a bidirectional DC module 50 and a power battery module 70;

[0022] The control board 20, the power board 30, the super capacitor module 40 and the bidirectional DC module 50 are all integrated in the housing 10, the control board 20 is electrically connected to the power board 30, the super capacitor module 40, the bidirectional DC module 50 and the power battery module 70 are all integrated on the power board 30, and the super capacitor module 40 and the bidirectional DC module 50 are electrically connected through a first copper bus 60, the bidirectional DC module 50 is electrically connected to the power battery module 70 through a second copper bus 110, and the control board 20 has a low voltage input terminal 21;

[0023] The super capacitor module 40 includes a first capacitor monomer 41, a second capacitor monomer 42, a pre-charge circuit fuse 43, a super capacitor negative electrode contactor 44, a super capacitor positive electrode contactor 45, a pre-charge contactor 46 and a pre-charge resistor 47;

[0024] The bidirectional DC module 50 includes a buck-boost module 51, an input-side pre-charge capacitor 52 and an output-side pre-charge capacitor 53;

[0025] The power battery module 70 includes a first power battery 71, a second power battery 72, a second MBD switch 73, a power battery main negative contactor 74, a power battery circuit fuse 75, a power battery main positive contactor 76, a power battery pre-charging contactor 77, a power battery pre-charging resistor 78 and a third copper bus 79;

[0026] The first capacitor monomer 41 is connected in series with the second capacitor monomer 42, the positive electrode of the second capacitor monomer 42 is electrically connected to the positive electrode of the pre-charging circuit fuse 43, the negative electrode of the pre-charging circuit fuse 43 is electrically connected to one end of the pre-charging contactor 46, the other end of the pre-charging contactor 46 is electrically connected to the positive electrode of the pre-charging resistor 47, one end of the super capacitor positive electrode contactor 45 is electrically connected to one end of the pre-charging contactor 46, and the other end thereof is electrically connected to the negative electrode of the pre-charging resistor 47, and the super capacitor negative electrode contactor 45 is electrically connected to one end of the pre-charging contactor 46. 4 is electrically connected to the negative electrode of the first capacitor monomer 41, the negative electrode of the first copper busbar 60 is electrically connected to the other end of the supercapacitor negative electrode contactor 44, the negative electrode of the input side pre-charge capacitor 52 and the second high voltage input end of the buck-boost module 51, and its positive electrode is electrically connected to the negative electrode of the pre-charge resistor 47 and the first high voltage input end of the buck-boost module 51, and the positive and negative electrodes of the output side pre-charge capacitor 53 are electrically connected to the first high voltage output end and the second high voltage output end of the buck-boost module 51;

[0027] The first power battery 71, the second MBD switch 73, the third copper busbar 79 and the second power battery 72 are connected in series in sequence, one end of the power battery pre-charging contactor 77 is electrically connected to the positive electrode of the first power battery 71, and the other end thereof is electrically connected to the positive electrode of the power battery pre-charging resistor 78, one end of the power battery main positive contactor 76 is electrically connected to the positive electrode of the first power battery 71, and the other end thereof is electrically connected to the negative electrode of the power battery pre-charging resistor 78, one end of the power battery main negative contactor 74 is electrically connected to the negative electrode of the second power battery 72, and the other end thereof is electrically connected to the negative electrode of the power battery circuit fuse 75, the negative electrode of the second copper busbar 110 is electrically connected to the positive electrode of the power battery circuit fuse 75 and the negative electrode of the output side pre-charging capacitor 53 respectively, and the positive electrode thereof is electrically connected to the negative electrode of the power battery pre-charging resistor 78 and the positive electrode of the output side pre-charging capacitor 53 respectively;

[0028] The housing 10 is provided with a low-voltage power socket 11, the first MBD switch 13, the second MBD switch 73 and a high-voltage output interface 14. The low-voltage power socket 11 is electrically connected to the low-voltage input terminal 21, and the high-voltage output interface 14 is electrically connected to the first high-voltage output terminal and the second high-voltage output terminal of the buck-boost module 51, respectively.

[0029] In the present invention, the control board 20 and the power board 30 are electrically connected through the pin 80, and the control board 20 is designed with a low-voltage input terminal 21, which can effectively reduce the occurrence of abnormal control power supply signals and control failures caused by loose connectors. The control board 20 is used to control and collect the temperature, voltage, current and hardware status information of the power board 30. The first copper bar 60, the second copper bar 110 and the third copper bar 79 are all flexible copper bars, wherein the first copper bar 60 and the second copper bar 110 are arranged on the power board 30, and the flexible copper bar can effectively resist the pressure of the outside world, have a certain shock absorption effect and protect the safety of the high-voltage circuit. The first MBD switch 13 is used to actively cut off the high-voltage circuit inside the auxiliary energy system to ensure the high-voltage safety during the intensive maintenance of the auxiliary energy system. The pre-charging resistor 47 is used to limit the size of the pre-charging current to achieve the purpose of protecting the pre-charging circuit insurance 43. The pre-charging circuit insurance 43 can actively disconnect the power supply circuit when the pre-charging current is too large or the load current is too large, thereby protecting the circuit loop. The supercapacitor negative electrode contactor 44 will actively close during pre-charging and energy supply. After the system pre-charge is completed, the buck-boost module 51 raises the voltage of the supercapacitor module 40 to a certain value and then supplies power to the outside; or the buck circuit will reduce the external voltage to a certain value to replenish the power of the supercapacitor module 40, so as to realize the charging and discharging function of the auxiliary energy system. The main function of the input side pre-charge capacitor 52 is to stabilize the input side voltage, and the main function of the output side pre-charge capacitor 53 is to stabilize the output side voltage; the second MBD switch 73 can ensure the high voltage safety of the power battery module 70. When the system needs to be maintained or repaired, the high voltage circuit of the power battery module 70 can be actively cut off by unplugging the second MBD switch 73 to ensure maintenance safety; and the third copper bar can effectively absorb the tension and pressure between the high voltage connection of the first power battery 71 and the second power battery 72, and prevent the high voltage connection from being damaged due to the tension and pressure between the high voltage connections. Similarly, the second copper bar 110 can effectively absorb the tension and pressure between the power battery module 70 and the bidirectional DC module high voltage connection, and prevent the high voltage connection from being damaged due to the tension and pressure between the high voltage connections. The power battery circuit insurance 75 is the insurance of the power battery module 70 to ensure that the circuit current is not too large. The first MBD switch 13 and the second MBD switch 73 are arranged on opposite sides of the housing 10, and the low-voltage power socket 11 and the high-voltage output interface 14 are arranged on the same side of the housing 10, wherein the low-voltage power socket 11 is also a communication interface, and the control board 20 is provided with a CAN communication interface 23, which is connected to the CAN bus through the low-voltage power socket 11.In addition, explosion-proof breathing valves 120 are provided on opposite sides of the shell 10. On the one hand, the explosion-proof breathing valves 120 can be turned on in time when the air pressure inside the shell 10 reaches a certain value, release the internal air pressure, prevent the air pressure from accumulating and causing further damage, and ensure the safety of the auxiliary energy integration system; at the same time, when the air pressure inside the shell 10 is low, it can be turned on in time to ensure that the air pressure inside the shell 10 is not too low and the shell will not be deflated, thereby causing safety hazards. The shell 10 is provided with a grounding harness 130, which can ensure the EMC performance and the grounding performance of the auxiliary energy integration system.

[0030] Specifically, the working principle of the auxiliary energy system of the present invention is as follows: the low-voltage input terminal 21 provides a low-voltage power supply to the control board 20 through the first low-voltage power socket 11. The control board 20 starts to work after obtaining the low-voltage power supply, and collects and controls the state of the power board 30. When the control board 20 receives the high-voltage instruction sent by the vehicle controller VCU, the control board 20 starts to execute the high-voltage process of the auxiliary energy system, that is, the parallel control process of the control board 20 is as follows:

[0031] Power battery pre-charging: The control board 20 controls the power battery main negative contactor 74 to be pulled in, and controls the power battery pre-charging contactor 77 to be pulled in 50ms later. The absolute value of the difference between the voltage across the output side pre-charging capacitor 53 and the total voltage of the power battery is monitored within 3S to be less than 10V. If not, it is determined that the pre-charging fails, and the control board 20 controls the power battery main negative contactor 74 and the power battery pre-charging contactor 77 to be disconnected; if so, it is determined that the pre-charging is successful, and the control board 20 controls the power battery main positive contactor 76 to be pulled in, and disconnects the pre-charging power battery pre-charging contactor 77 after 100ms, and the power battery pre-charging is completed;

[0032] Supercapacitor pre-charge:

[0033] The control board 20 controls the supercapacitor negative electrode contactor 44 to be pulled in, and controls the pre-charge contactor 46 to be pulled in 50ms later. The absolute value of the difference between the voltage across the input side pre-charge capacitor 52 and the total voltage of the supercapacitor is monitored within 3S to be less than 10V. If not, it is determined that the pre-charge fails, and the control board 20 controls the supercapacitor negative electrode contactor 44 and the pre-charge contactor 46 to be disconnected; if so, it is determined that the pre-charge is successful, and the control board 20 controls the supercapacitor positive electrode contactor 45 to be pulled in, and disconnects the pre-charge contactor 46 after 100ms, and the supercapacitor pre-charge is completed;

[0034] This completes the high voltage function on the auxiliary energy integration system.

[0035] After the high voltage is increased, when the control board 20 receives the discharge command sent by the vehicle controller VCU, the control board 20 will actively adjust the output voltage of the boost circuit in the boost-buck module 51 according to the discharge power, thereby realizing the external discharge function of the supercapacitor in the auxiliary energy system.

[0036] After the high voltage is completed, when the control board 20 receives the charging instruction sent by the vehicle controller VCU, the control board 20 will actively adjust the output voltage of the buck circuit in the buck-boost module 51 according to the charging power, thereby realizing the supercapacitor charging function in the auxiliary energy system.

[0037] Whether the buck-boost module 51 performs voltage boost or voltage reduction is determined by the charge and discharge state and the voltage of the high-voltage input terminal and the high-voltage output terminal of the buck-boost module 51; during charging, the input voltage of the high-voltage input terminal of the buck-boost module 51 is higher than the high-voltage output terminal, at which time the buck-boost module 51 is used for voltage boost, and the input voltage of the high-voltage input terminal of the buck-boost module 51 is lower than the high-voltage output terminal, at which time the buck-boost module 51 is used for voltage reduction; during discharging, the input voltage of the high-voltage input terminal of the buck-boost module 51 is higher than the high-voltage output terminal, at which time the buck-boost module 51 is used for voltage reduction, and the input voltage of the high-voltage input terminal of the buck-boost module 51 is lower than the high-voltage output terminal, at which time the buck-boost module 51 is used for voltage boost. Among them, the first high-voltage output terminal and the second high-voltage output terminal of the buck-boost module 51 together constitute the high-voltage output terminal of the buck-boost module 51, and the first high-voltage input terminal and the second high-voltage input terminal of the buck-boost module 51 together constitute the high-voltage input terminal of the buck-boost module 51.

[0038] The auxiliary energy system of the present invention integrates the original supercapacitor system, bidirectional DC and power battery into a hybrid auxiliary energy system. Compared with three separate systems, the volume and weight of the auxiliary energy system are significantly reduced, which saves a lot of layout space for hydrogen energy vehicles, significantly reduces the production cost of hydrogen energy vehicles, improves economic performance, and has the advantages of strong high-voltage safety performance and strong practicality.

[0039] In the above embodiment, a coolant water pipe 100 is provided inside the shell 10, and the coolant water pipe 100 is laid under the power board 30. A coolant inlet 101 and a coolant outlet 102 are provided on the shell 10, wherein the coolant inlet 101 is connected to one end of the coolant water pipe 100, and the coolant outlet 102 is connected to the other end of the coolant water pipe 100.

[0040] In the present invention, the coolant enters the shell 10 through the coolant inlet 101. After sufficient heat exchange is carried out inside the shell 10 to dissipate heat to high-voltage devices such as the IGBT, the first capacitor monomer 41, the second capacitor monomer 42, the first power battery 71 and the second power battery 72 on the power board 30, the coolant is then output through the coolant outlet 102 to achieve the purpose of cooling the cooling function of the auxiliary energy integrated two-in-one system.

[0041] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0042] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0043] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuel cell hydrogen energy vehicle auxiliary energy system, characterized in that: It comprises a control board (20), a power board (30), a super capacitor module (40), a bidirectional DC module (50), a power battery module (70), a first copper busbar (60) and a second copper busbar (110); The control board (20) and the power board (30) are electrically connected, and the super capacitor module (40), the bidirectional DC module (50) and the power battery module (70) are all integrated and arranged on the power board (30); The supercapacitor module (40) comprises a first capacitor monomer (41), a second capacitor monomer (42), a pre-charging circuit fuse (43), a supercapacitor negative electrode contactor (44), a supercapacitor positive electrode contactor (45), a pre-charging contactor (46) and a pre-charging resistor (47); The bidirectional DC module (50) comprises a buck-boost module (51), an input-side pre-charge capacitor (52) and an output-side pre-charge capacitor (53); The power battery module (70) comprises a first power battery (71), a second power battery (72), a second MBD switch (73), a power battery main negative contactor (74), a power battery circuit fuse (75), a power battery main positive contactor (76), a power battery pre-charging contactor (77), a power battery pre-charging resistor (78) and a third copper busbar (79); The first capacitor monomer (41) and the second capacitor monomer (42) are connected in series, the positive electrode of the second capacitor monomer (42) is electrically connected to the positive electrode of the pre-charging circuit fuse (43), the negative electrode of the pre-charging circuit fuse (43) is electrically connected to one end of the pre-charging contactor (46), the other end of the pre-charging contactor (46) is electrically connected to the positive electrode of the pre-charging resistor (47), one end of the supercapacitor positive electrode contactor (45) is electrically connected to one end of the pre-charging contactor (46), and the other end thereof is electrically connected to the negative electrode of the pre-charging resistor (47), and the supercapacitor negative electrode contactor (45) is electrically connected to one end of the pre-charging contactor (46). One end of the supercapacitor (44) is electrically connected to the negative electrode of the first capacitor monomer (41); the negative electrode of the first copper busbar (60) is electrically connected to the other end of the supercapacitor negative electrode contactor (44), the negative electrode of the input side pre-charge capacitor (52) and the second high voltage input end of the buck-boost module (51); its positive electrode is electrically connected to the negative electrode of the pre-charge resistor (47) and the first high voltage input end of the buck-boost module (51); the positive electrode and negative electrode of the output side pre-charge capacitor (53) are electrically connected to the first high voltage output end and the second high voltage output end of the buck-boost module (51); The first power battery (71), the second MBD switch (73), the third copper busbar (79) and the second power battery (72) are connected in series in sequence; one end of the power battery pre-charging contactor (77) is electrically connected to the positive electrode of the first power battery (71), and the other end thereof is electrically connected to the positive electrode of the power battery pre-charging resistor (78); one end of the power battery main positive contactor (76) is electrically connected to the positive electrode of the first power battery (71), and the other end thereof is electrically connected to the positive electrode of the power battery pre-charging resistor ( The negative electrode of the power battery main negative contactor (78) is electrically connected to the negative electrode of the second power battery (72), one end of the power battery main negative contactor (74) is electrically connected to the negative electrode of the second power battery (72), and the other end thereof is electrically connected to the negative electrode of the power battery circuit fuse (75), the negative electrode of the second copper busbar (110) is respectively electrically connected to the positive electrode of the power battery circuit fuse (75) and the negative electrode of the output side pre-charge capacitor (53), and the positive electrode thereof is respectively electrically connected to the negative electrode of the power battery pre-charge resistor (78) and the positive electrode of the output side pre-charge capacitor (53); It also comprises a housing (10), wherein the control board (20), the power board (30), the super capacitor module (40) and the bidirectional DC module (50) are all integrated and arranged in the housing (10), the control board (20) has a low voltage input end (21), the housing (10) is provided with a low voltage power supply socket (11), a first MBD switch (13), a second MBD switch (73) and a high voltage output interface (14), the low voltage power supply socket (11) is electrically connected to the low voltage input end (21), and the high voltage output interface (14) is electrically connected to the first high voltage output end and the second high voltage output end of the buck-boost module (51), respectively; Explosion-proof breathing valves (120) are provided on opposite sides of the housing (10); A coolant water pipe (100) is provided inside the shell (10), and the coolant water pipe (100) is laid below the power board (30). A coolant inlet (101) and a coolant outlet (102) are provided on the shell (10), wherein the coolant inlet (101) is connected to one end of the coolant water pipe (100), and the coolant outlet (102) is connected to the other end of the coolant water pipe (100).

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