Charging pile electric energy inversion module oil-cooled heat dissipation system easy to clean and maintain
The oil-cooled heat dissipation system solves the dust intrusion problem of the charging pile power inverter module, achieves silent and continuous operation and low maintenance costs, and improves equipment reliability.
Patent Information
- Application Number
- CN202410310159.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-09-19
AI Technical Summary
The existing charging pile power inverter module cooling system easily absorbs external dust and foreign matter, and cannot work silently for a long time. Parts such as fans and windows require frequent cleaning and maintenance, resulting in high management costs and high equipment failure rates.
An oil-cooled heat dissipation system is adopted, which uses the heat dissipation oil to pass through the convection cavity structure in the sealed aluminum alloy shell. The heat dissipation oil flow rate is controlled by temperature sensors and electronic control valves to achieve natural radiation and air cooling. The power conversion circuit board is sealed in the electronic compartment to prevent dust intrusion.
It enables high-power charging equipment to work continuously for a long time in a silent and static state, reduces the frequency of cleaning and maintenance, and reduces equipment failure rate and management costs.
Smart Images
Figure CN120676584A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of new energy charging piles, and in particular relates to an oil-cooled heat dissipation system for an electric energy inverter module of a charging pile that is easy to clean and maintain. Background Art
[0002] An important factor in whether new energy vehicles can be promoted is the convenience of use. Therefore, for electric vehicle charging needs, the faster the better. However, as the charging speed increases, the power of the charging pile inductor module increases, and the heat of components such as the inductor module and the power module is generated quickly and in large quantities. If it is not dissipated in time, it will cause a serious safety accident.
[0003] New energy vehicle charging piles are difficult to maintain due to their large number and scattered distribution. In particular, most power conversion inverter modules use forced air cooling for heat dissipation. Forced air cooling requires large air throughput and high-speed fans, which easily inhales external dust and foreign matter. In addition, the main circuit components are exposed outside the oil circuit and are easily affected by the environment. This makes it impossible for high-power charging equipment to work continuously in a silent and static state for a long time and output strong power. In addition, its fans, windows and other parts need to be cleaned and maintained frequently, resulting in increased management costs and a high equipment failure rate.
[0004] Therefore, the problem that the above-mentioned heat dissipation system needs to be cleaned and maintained frequently needs to be solved urgently to improve the usage scenarios of charging piles. Summary of the Invention
[0005] (1) Technical problems to be solved
[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an oil-cooled heat dissipation system for a charging pile power inverter module that is easy to clean and maintain. The heat dissipation system is intended to solve the technical problems of the existing technology that it is easy to absorb external dust and foreign matter, cannot work silently for a long time, and the fans, windows and other parts need to be cleaned and maintained frequently.
[0007] (2) Technical solution
[0008] In order to solve the above technical problems, the present invention provides an oil-cooled heat dissipation system for a charging pile electric energy inverter module that is easy to clean and maintain. The heat dissipation system includes an electronic compartment and a heat dissipation control panel, a booster pump and a radiator arranged on the right side of the electronic compartment in sequence; wherein, an oil outlet pipe is provided at the upper end of the electronic compartment, an oil inlet pipe is provided at the lower end of the electronic compartment, a first connecting pipe is installed at the upper end of the oil outlet pipe, an electric control valve and a second connecting pipe are installed at the right end of the first connecting pipe in sequence, the second connecting pipe is connected to the inlet end of the radiator, a third connecting pipe is installed at the lower end of the oil inlet pipe, and the third connecting pipe It is connected to the outlet end of the boost pump, the inlet end of the boost pump is equipped with a fourth connecting pipe, the fourth connecting pipe is connected to the outlet end of the radiator, the electronic cabin includes an outer shell, the outer shell is sequentially provided with an upper convection chamber, an oil chamber and a lower convection chamber from top to bottom, an electric energy conversion circuit board is installed in the oil chamber, an inlet temperature sensor is installed at the inlet end of the radiator, an outlet temperature sensor is installed at the outlet end of the radiator, and a first on-board temperature sensor, a second on-board temperature sensor, a third temperature sensor and a fourth temperature sensor are installed clockwise at the front end of the electric energy conversion circuit board.
[0009] When using the heat dissipation system of this technical solution, the steps are as follows:
[0010] Step 1: Low-temperature heat dissipation oil enters the electronic compartment from the oil inlet pipe. The heat dissipation oil passes through the electric energy conversion circuit board in the oil chamber. When the electric energy conversion circuit board is in operation, it generates heat to heat the oil and increase its temperature. The upper and lower convection chambers at the upper and lower ends of the outer shell fully mix the heat dissipation oil and make its temperature uniform. The heat dissipation oil flows out from the oil outlet pipe, passes through the first connecting pipe, the electric control valve, and the second connecting pipe, and enters the radiator. The hot oil cools in the radiator and then returns to the electronic compartment through the fourth connecting pipe, the booster pump, and the third connecting pipe.
[0011] Step 2: The electric control valve controls the flow rate of the cooling oil. In an extremely low temperature environment, the electric control valve reduces the flow rate to keep the temperature inside the electronic cabin within a preset range. The specific gravity of the cooling oil decreases after heating and increases after cooling. Under appropriate conditions, the cooling oil will flow naturally under the action of the specific gravity difference. The first temperature sensor on the front end of the power conversion circuit board, the second temperature sensor, the third temperature sensor and the fourth temperature sensor detect the temperature of the cooling oil flowing through the power conversion circuit board. The inlet temperature sensor and the outlet temperature sensor collect the cooling oil temperature data at the inlet and outlet of the radiator, and send the temperature data to the cooling control board. The system working condition is judged according to the temperature difference. When the temperature difference between the inlet temperature sensor and the outlet temperature sensor is small, and the first When the temperatures of the on-board temperature sensor, the second on-board temperature sensor, the third temperature sensor and the fourth temperature sensor are high, the boost pump is turned on to reduce the temperatures of the first on-board temperature sensor, the second on-board temperature sensor, the third temperature sensor and the fourth temperature sensor. When the temperatures of the inlet temperature sensor and the outlet temperature sensor are extremely low, the electric control valve is adjusted to increase the temperatures of the first on-board temperature sensor, the second on-board temperature sensor, the third temperature sensor and the fourth temperature sensor. When the temperature difference between the first on-board temperature sensor, the second on-board temperature sensor, the third temperature sensor and the fourth temperature sensor is large, it is determined that the convection in the electronic cabin is blocked, and the heat dissipation control board sends an alarm to the charging pile management system host computer through the bus.
[0012] Furthermore, the number of the oil outlet pipes and the oil inlet pipes is not less than 2, and the number of the oil outlet pipes and the oil inlet pipes corresponds one to one.
[0013] Furthermore, the outer shell adopts a fully enclosed design, and the material of the outer shell is aluminum alloy.
[0014] Furthermore, the heat dissipation control board is connected to the charging pile bus interface, and the heat dissipation control board is connected to the boost pump, the electronically controlled valve, the inlet temperature sensor, the outlet temperature sensor, the first on-board temperature sensor, the second on-board temperature sensor, the third temperature sensor and the fourth temperature sensor through a wiring harness.
[0015] Furthermore, the first on-board temperature sensor, the second on-board temperature sensor, the third temperature sensor and the fourth temperature sensor are respectively installed at the four corners of the front end of the power conversion circuit board.
[0016] Furthermore, the probes of the inlet temperature sensor and the outlet temperature sensor extend into the pipelines at both ends of the inlet and outlet of the radiator respectively.
[0017] The present invention also provides a method for using an oil-cooled heat dissipation system for a charging pile power inverter module that is easy to clean and maintain, and the steps are as follows:
[0018] Step 1: Low-temperature heat dissipation oil enters the electronic compartment from the oil inlet pipe. The heat dissipation oil passes through the electric energy conversion circuit board in the oil chamber. When the electric energy conversion circuit board is in operation, it generates heat to heat the oil and increase its temperature. The upper and lower convection chambers at the upper and lower ends of the outer shell fully mix the heat dissipation oil and make its temperature uniform. The heat dissipation oil flows out from the oil outlet pipe, passes through the first connecting pipe, the electric control valve, and the second connecting pipe, and enters the radiator. The hot oil cools in the radiator and then returns to the electronic compartment through the fourth connecting pipe, the booster pump, and the third connecting pipe.
[0019] Step 2: The electric control valve controls the flow rate of the cooling oil. In an extremely low temperature environment, the temperature inside the electronic cabin is kept within a preset range. The specific gravity of the cooling oil decreases after heating and increases after cooling. Under appropriate conditions, the cooling oil will flow naturally under the action of the specific gravity difference. The temperature sensor on the first board, the temperature sensor on the second board, the third temperature sensor and the fourth temperature sensor on the front end of the power conversion circuit board detect the temperature of the cooling oil flowing through the power conversion circuit board. The inlet temperature sensor and the outlet temperature sensor collect the cooling oil temperature data at the inlet and outlet of the radiator, and send the temperature data to the cooling control board. The system working condition is judged according to the temperature difference. When the temperature difference between the inlet temperature sensor and the outlet temperature sensor is small, and the temperature sensor on the first board is When the temperatures of the temperature sensor on the first board, the temperature sensor on the second board, the third temperature sensor and the fourth temperature sensor are high, the boost pump is turned on to reduce the temperatures of the temperature sensor on the first board, the temperature sensor on the second board, the third temperature sensor and the fourth temperature sensor. When the temperatures of the inlet temperature sensor and the outlet temperature sensor are extremely low, the electric control valve is adjusted to increase the temperatures of the temperature sensor on the first board, the temperature sensor on the second board, the third temperature sensor and the fourth temperature sensor. When the temperature difference between the temperature sensor on the first board, the temperature sensor on the second board, the third temperature sensor and the fourth temperature sensor is large, it is determined that the convection in the electronic cabin is blocked, and the heat dissipation control board sends an alarm to the upper computer of the charging pile management system through the bus.
[0020] Furthermore, in the extremely low temperature environment, the electronically controlled valve reduces the flow rate to keep the temperature inside the electronic compartment within a preset range.
[0021] (3) Beneficial effects
[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: the heat dissipation system of the present invention uses the power transformer cooling oil to conduct the heat generated during the operation of the high-power energy conversion circuit through the oil circuit, and flows it to the radiator end at the charging pile casing for cooling by natural radiation and natural wind. It utilizes the large heat dissipation area of the oil pipe, avoids the problem of forced air cooling requiring large air flux and high-speed fans, does not inhale external dust and foreign matter, and is easy to clean and maintain. Moreover, the power conversion circuit board is sealed in the electronic cabin, which extremely well protects the power conversion circuit board from environmental influences, which enables high-power charging equipment to work continuously for a long time in silence and static state, and output powerful electricity. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 A schematic diagram of the three-dimensional structure of a specific embodiment of the heat dissipation system of the present invention;
[0024] Figure 2 This is a schematic diagram of the internal structure of the electronic compartment in a specific embodiment of the heat dissipation system of the present invention;
[0025] Figure 3 A circuit block diagram of a specific embodiment of the heat dissipation system of the present invention;
[0026] Figure 4 This is a pipeline block diagram of a specific implementation of the heat dissipation system of the present invention.
[0027] The marks in the accompanying drawings are: 1. Electronic cabin; 101. Outer shell; 102. Upper convection chamber; 103. Oil chamber; 104. Lower convection chamber; 2. Booster pump; 3. Radiator; 4. Heat dissipation control board; 5. Oil outlet pipe; 6. Oil inlet pipe; 7. First connecting pipe; 8. Electric control valve; 9. Second connecting pipe; 10. Third connecting pipe; 11. Fourth connecting pipe; 12. Power conversion circuit board; 13. Inlet temperature sensor; 14. Outlet temperature sensor; 15. First board temperature sensor; 16. Second board temperature sensor; 17. Third temperature sensor; 18. Fourth temperature sensor. DETAILED DESCRIPTION
[0028] This specific embodiment is an oil-cooled heat dissipation system for a charging pile power inverter module that is easy to clean and maintain. The internal structure diagram of the electronic compartment 1 is shown in FIG. Figure 1 As shown, the front structure diagram is as follows Figure 2As shown, the heat dissipation system includes an electronic cabin 1 and a heat dissipation control board 4, a booster pump 2 and a radiator 3 arranged in sequence on the right side of the electronic cabin 1; an oil outlet pipe 5 is provided at the upper end of the electronic cabin 1, and an oil inlet pipe 6 is provided at the lower end of the electronic cabin 1. A first connecting pipe 7 is installed at the upper end of the oil outlet pipe 5, and an electric control valve 8 and a second connecting pipe 9 are installed at the right end of the first connecting pipe 7 in sequence. The second connecting pipe 9 is connected to the inlet end of the radiator 3, and a third connecting pipe 10 is installed at the lower end of the oil inlet pipe 6. The third connecting pipe 10 is connected to the outlet end of the booster pump 2, and the inlet end of the booster pump 2 is installed with a fourth connecting pipe 11. The fourth connecting pipe 11 is connected to the outlet end of the radiator 3. The electronic cabin 1 includes an outer shell 101. The outer shell 101 is provided with an upper convection chamber 102, an oil chamber 103 and a lower convection chamber 104 from top to bottom. The oil chamber 103 is provided with an electric energy conversion circuit board 12. The inlet end of the radiator 3 is provided with an inlet temperature sensor 13. The outlet end of the radiator 3 is provided with an outlet temperature sensor 14. The front end of the electric energy conversion circuit board 12 is provided with a first on-board temperature sensor 15, a second on-board temperature sensor 16, a third temperature sensor 17 and a fourth temperature sensor 18 in a clockwise direction.
[0029] In this embodiment, the number of electronic compartments 1 can be multiple, and the electronic compartments 1 are connected in parallel.
[0030] Furthermore, the number of the oil outlet pipes 5 and the oil inlet pipes 6 is no less than 2, and the number of the oil outlet pipes 5 and the number of the oil inlet pipes 6 correspond one to one.
[0031] Furthermore, the outer shell 101 adopts a fully enclosed design, and the material of the outer shell 101 is aluminum alloy.
[0032] Furthermore, the heat dissipation control board 4 is connected to the charging pile bus interface, and the heat dissipation control board 4 is connected to the boost pump 2, the electronically controlled valve 8, the inlet temperature sensor 13, the outlet temperature sensor 14, the first on-board temperature sensor 15, the second on-board temperature sensor 16, the third temperature sensor 17 and the fourth temperature sensor 18 through a wiring harness.
[0033] Furthermore, the first on-board temperature sensor 15 , the second on-board temperature sensor 16 , the third temperature sensor 17 and the fourth temperature sensor 18 are respectively installed at the four corners of the front end of the power conversion circuit board 12 .
[0034] Furthermore, the probes of the inlet temperature sensor 13 and the outlet temperature sensor 14 extend into the pipes at both ends of the inlet and outlet of the radiator 3 respectively.
[0035] The present invention also provides a method for using an oil-cooled heat dissipation system for a charging pile power inverter module that is easy to clean and maintain, and the steps are as follows:
[0036] Step 1: Low-temperature heat dissipation oil enters the electronic compartment 1 from the oil inlet pipe 6. The heat dissipation oil passes through the electric energy conversion circuit board 12 in the oil chamber 103. When the electric energy conversion circuit board 12 is in operation, it generates heat to heat the oil and increase its temperature. The upper convection chamber 102 and the lower convection chamber 104 at the upper and lower ends of the outer shell 101 fully mix the heat dissipation oil and make its temperature uniform. The heat dissipation oil flows out from the oil outlet pipe 5, passes through the first connecting pipe 7, the electric control valve 8 and the second connecting pipe 9, and enters the radiator 3. The hot oil is cooled in the radiator 3 and then returns to the electronic compartment 1 through the fourth connecting pipe 11, the booster pump 2 and the third connecting pipe 10.
[0037] Step 2: The electric control valve 8 controls the flow rate of the heat dissipation oil. In an extremely low temperature environment, the temperature inside the electronic cabin 1 is maintained within a preset temperature range. The specific gravity of the heat dissipation oil decreases after heating and increases after cooling. Under appropriate conditions, the heat dissipation oil will flow naturally under the action of the specific gravity difference. The temperature sensor 15 on the first board, the temperature sensor 16 on the second board, the third temperature sensor 17 and the fourth temperature sensor 18 on the front end of the power conversion circuit board 12 detect the temperature of the heat dissipation oil flowing through the power conversion circuit board 12. The inlet temperature sensor 13 and the outlet temperature sensor 14 collect the heat dissipation oil temperature data at the inlet and outlet of the radiator 3, and send the temperature data to the heat dissipation control board 4. The system working condition is judged according to the temperature difference. When the temperature difference between the inlet temperature sensor 13 and the outlet temperature sensor 14 is small, and the temperature sensors 15 on the first board, 16 on the second board, 17 on the third board and 18 on the fourth board are high, the system working condition is judged according to the temperature difference. When the temperatures of the upper temperature sensor 16, the third temperature sensor 17 and the fourth temperature sensor 18 are high, the boost pump 2 is turned on to reduce the temperatures of the first on-board temperature sensor 15, the second on-board temperature sensor 16, the third temperature sensor 17 and the fourth temperature sensor 18. When the temperatures of the inlet temperature sensor 13 and the outlet temperature sensor 14 are extremely low, the electric control valve 8 is adjusted to increase the temperatures of the first on-board temperature sensor 15, the second on-board temperature sensor 16, the third temperature sensor 17 and the fourth temperature sensor 18. When the temperature difference between the first on-board temperature sensor 15, the second on-board temperature sensor 16, the third temperature sensor 17 and the fourth temperature sensor 18 is large, it is determined that the convection in the electronic cabin 1 is blocked, and the heat dissipation control board 4 sends an alarm to the charging pile management system host computer through the bus.
[0038] Furthermore, in the extremely low temperature environment, the electronic control valve 8 reduces the flow rate to keep the temperature inside the electronic compartment 1 within a preset range.
[0039] The circuit diagram of the cooling system is as follows Figure 3 The pipeline block diagram is shown as Figure 4 shown.
[0040] When using the heat dissipation system of this technical solution, the steps are as follows:
[0041] Step 1: Low-temperature heat dissipation oil enters the electronic compartment 1 from the oil inlet pipe 6. The heat dissipation oil passes through the electric energy conversion circuit board 12 in the oil chamber 103. When the electric energy conversion circuit board 12 is in operation, it generates heat to heat the oil and increase its temperature. The upper convection chamber 102 and the lower convection chamber 104 at the upper and lower ends of the outer shell 101 fully mix the heat dissipation oil and make its temperature uniform. The heat dissipation oil flows out from the oil outlet pipe 5, passes through the first connecting pipe 7, the electric control valve 8 and the second connecting pipe 9, and enters the radiator 3. The hot oil is cooled in the radiator 3 and then returns to the electronic compartment 1 through the fourth connecting pipe 11, the booster pump 2 and the third connecting pipe 10.
[0042] Step 2: The electric control valve 8 controls the flow rate of the cooling oil. In an extremely low temperature environment, the electric control valve 8 reduces the flow rate to keep the temperature inside the electronic cabin 1 within a preset range. The specific gravity of the cooling oil decreases after heating and increases after cooling. Under appropriate conditions, the cooling oil will flow naturally under the action of the specific gravity difference. The first board temperature sensor 15, the second board temperature sensor 16, the third temperature sensor 17 and the fourth temperature sensor 18 at the front end of the power conversion circuit board 12 detect the temperature of the cooling oil flowing through the power conversion circuit board 12. The inlet temperature sensor 13 and the outlet temperature sensor 14 collect the cooling oil temperature data at the inlet and outlet of the radiator 3, and send the temperature data to the cooling control board 4. The system working condition is judged according to the temperature difference. When the temperature difference between the inlet temperature sensor 13 and the outlet temperature sensor 14 is small, and the temperature sensor 1 on the first board is 5. When the temperatures of the temperature sensor 16, the third temperature sensor 17 and the fourth temperature sensor 18 on the second board are high, the boost pump 2 is turned on to reduce the temperatures of the temperature sensor 15, the temperature sensor 16, the third temperature sensor 17 and the fourth temperature sensor 18 on the first board. When the temperatures of the inlet temperature sensor 13 and the outlet temperature sensor 14 are extremely low, the electric control valve 8 is adjusted to increase the temperatures of the temperature sensor 15, the temperature sensor 16, the third temperature sensor 17 and the fourth temperature sensor 18 on the first board. When the temperature difference between the temperature sensor 15, the temperature sensor 16, the third temperature sensor 17 and the fourth temperature sensor 18 on the first board is large, it is determined that the convection in the electronic cabin 1 is blocked, and the heat dissipation control board 4 sends an alarm to the charging pile management system host computer through the bus.
Claims
1. An oil-cooled heat dissipation system for a charging pile power inverter module that is easy to clean and maintain, the heat dissipation system comprising an electronic compartment (1), a heat dissipation control panel (4), a booster pump (2) and a radiator (3) sequentially arranged on the right side of the electronic compartment (1); characterized in that: An oil outlet pipe (5) is provided at the upper end of the electronic cabin (1), and an oil inlet pipe (6) is provided at the lower end of the electronic cabin (1). A first connecting pipe (7) is installed at the upper end of the oil outlet pipe (5), and an electric control valve (8) and a second connecting pipe (9) are installed in sequence at the right end of the first connecting pipe (7). The second connecting pipe (9) is connected to the inlet end of the radiator (3). A third connecting pipe (10) is installed at the lower end of the oil inlet pipe (6), and the third connecting pipe (10) is connected to the outlet end of the boosting pump (2). A fourth connecting pipe (11) is installed at the inlet end of the boosting pump (2), and the fourth connecting pipe (11) is connected to the outlet end of the radiator (3). The electronic cabin (1) comprises an outer shell (101), wherein an upper convection chamber (102), an oil chamber (103) and a lower convection chamber (104) are sequentially arranged in the outer shell (101) from top to bottom, an electric energy conversion circuit board (12) is installed in the oil chamber (103), an inlet temperature sensor (13) is installed at the inlet end of the radiator (3), an outlet temperature sensor (14) is installed at the outlet end of the radiator (3), and a first on-board temperature sensor (15), a second on-board temperature sensor (16), a third temperature sensor (17) and a fourth temperature sensor (18) are installed clockwise at the front end of the electric energy conversion circuit board (12).
2. The oil-cooled heat dissipation system for the charging pile power inverter module that is easy to clean and maintain according to claim 1 is characterized in that: The number of the oil outlet pipes (5) and the oil inlet pipes (6) is no less than 2, and the number of the oil outlet pipes (5) and the number of the oil inlet pipes (6) are one-to-one corresponding.
3. The oil-cooled heat dissipation system for the charging pile power inverter module that is easy to clean and maintain according to claim 1 is characterized in that: The outer shell (101) adopts a fully enclosed design, and the material of the outer shell (101) is aluminum alloy.
4. The oil-cooled heat dissipation system for a charging pile power inverter module that is easy to clean and maintain according to claim 1 is characterized in that: The heat dissipation control board (4) is connected to the charging pile bus interface, and the heat dissipation control board (4) is connected to the boost pump (2), the electric control valve (8), the inlet temperature sensor (13), the outlet temperature sensor (14), the first on-board temperature sensor (15), the second on-board temperature sensor (16), the third temperature sensor (17) and the fourth temperature sensor (18) via a wiring harness.
5. The oil-cooled heat dissipation system for the charging pile power inverter module that is easy to clean and maintain according to claim 1 is characterized in that: The first on-board temperature sensor (15), the second on-board temperature sensor (16), the third temperature sensor (17) and the fourth temperature sensor (18) are respectively mounted at the four corners of the front end of the electric energy conversion circuit board (12).
6. The oil-cooled heat dissipation system for a charging pile power inverter module that is easy to clean and maintain according to claim 1 is characterized in that: The probes of the inlet temperature sensor (13) and the outlet temperature sensor (14) extend into the pipelines at the inlet and outlet ends of the radiator (3) respectively.
7. The oil-cooled heat dissipation system for a charging pile power inverter module that is easy to clean and maintain according to claim 1 is characterized in that: Here’s how to use it: Step 1: Low-temperature heat dissipation oil enters the electronic cabin (1) from the oil inlet pipe (6), and the heat dissipation oil passes through the electric energy conversion circuit board (12) in the oil chamber (103). The electric energy conversion circuit board (12) generates heat when working to heat the oil and increase its temperature. The upper convection chamber (102) and the lower convection chamber (104) at the upper and lower ends of the outer shell (101) fully mix the heat dissipation oil and make its temperature uniform. The heat dissipation oil flows out from the oil outlet pipe (5), passes through the first connecting pipe (7), the electric control valve (8) and the second connecting pipe (9), and enters the radiator (3). The hot oil is cooled in the radiator (3) and then returns to the electronic cabin (1) through the fourth connecting pipe (11), the booster pump (2) and the third connecting pipe (10); Step 2: The electric control valve (8) controls the flow rate of the heat dissipation oil. In an extremely low temperature environment, the temperature inside the electronic cabin (1) is maintained within a preset temperature range. The specific gravity of the heat dissipation oil decreases after heating and increases after cooling. Under appropriate conditions, the heat dissipation oil will flow naturally under the action of the specific gravity difference. The first temperature sensor (15), the second temperature sensor (16), the third temperature sensor (17) and the fourth temperature sensor (18) on the front end of the power conversion circuit board (12) detect the temperature of the heat dissipation oil flowing through the power conversion circuit board (12). The inlet temperature sensor (13) and the outlet temperature sensor (14) collect the heat dissipation oil temperature data at the inlet and outlet of the radiator (3) and send the temperature data to the heat dissipation control board (4). The system working condition is judged based on the temperature difference. When the temperature difference between the inlet temperature sensor (13) and the outlet temperature sensor (14) is small, and the temperature difference between the first temperature sensor (15) and the second temperature sensor (16) is high, the system working condition is judged based on the temperature difference. When the temperatures of the first temperature sensor (16), the third temperature sensor (17) and the fourth temperature sensor (18) are high, the boost pump (2) is turned on to reduce the temperatures of the first temperature sensor (15), the second temperature sensor (16), the third temperature sensor (17) and the fourth temperature sensor (18). When the temperatures of the inlet temperature sensor (13) and the outlet temperature sensor (14) are extremely low, the electric control valve (8) is adjusted to increase the temperatures of the first temperature sensor (15), the second temperature sensor (16), the third temperature sensor (17) and the fourth temperature sensor (18). When the temperature difference between the first temperature sensor (15), the second temperature sensor (16), the third temperature sensor (17) and the fourth temperature sensor (18) is large, it is determined that convection in the electronic compartment (1) is blocked, and the heat dissipation control board (4) sends an alarm to the upper computer of the charging pile management system through the bus.
8. The oil-cooled heat dissipation system for the charging pile power inverter module that is easy to clean and maintain according to claim 7 is characterized in that: In the extremely low temperature environment, the electric control valve (8) reduces the flow rate so that the temperature inside the electronic compartment (1) is maintained within a preset temperature range.