Heat dissipation system, heat dissipation method thereof, distribution box, battery pack and electric device

Abstract

The present disclosure relates to a heat dissipation system and a heat dissipation method thereof, a power distribution box, a battery pack and a power utilization device. The heat dissipation system comprises a heat exchange plate, a temperature detection mechanism and a reversing structure. The heat exchange plate comprises a curvedly extended cooling flow channel, and a first opening and a second opening in communication with the cooling flow channel. The temperature detection mechanism comprises a first temperature sensor for measuring a first temperature of the cooling liquid at the first opening and a second temperature sensor for measuring a second temperature of the cooling liquid at the second opening. The reversing structure is connected to the cooling loop and the heat exchange plate, and has a first working state and a second working state. In the first working state, the first opening is in communication with the liquid inlet pipeline and the second opening is in communication with the liquid return pipeline. In the second working state, the first opening is in communication with the liquid return pipeline and the second opening is in communication with the liquid inlet pipeline. The reversing structure is in communication connection with the temperature detection mechanism, and switches the first working state and the second working state according to the first temperature and the second temperature.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, specifically to a heat dissipation system and method thereof, a power distribution box, a battery pack, and electrical equipment. Background Technology

[0002] The high-voltage distribution box of a vehicle's power battery is a core electrical component. It integrates multiple high-power heat-generating electrical components. Under high-power charging and discharging conditions, these components generate a significant amount of heat. To dissipate this heat, a heat dissipation structure is installed inside the distribution box housing. However, the heat dissipation structures in related technologies suffer from uneven heat dissipation, which can easily lead to the risk of thermal runaway. Summary of the Invention

[0003] The purpose of this disclosure is to provide a heat dissipation system and method thereof, a power distribution box, a battery pack and an electrical device. The heat dissipation system can switch between a first operating state and a second operating state through a reversing structure, thereby enabling the heat exchange plate to dissipate heat evenly and reducing the risk of thermal runaway, so as to at least partially solve the problems in the related art.

[0004] To overcome the problems existing in the related art, a first aspect of the present disclosure provides a heat dissipation system, including: The heat exchange plate includes a curved and extended cooling channel, and a first opening and a second opening respectively communicating with the cooling channel; The temperature detection mechanism includes a first temperature sensor and a second temperature sensor. The first temperature sensor is used to measure a first temperature of the coolant at the first opening, and the second temperature sensor is used to detect a second temperature of the coolant at the second opening. The reversing structure connects the external cooling circuit to the first opening and the second opening, and has a first working state and a second working state. In the first working state, the first opening is connected to the liquid inlet pipe of the cooling circuit, and the second opening is connected to the liquid return pipe of the cooling circuit. In the second working state, the first opening is connected to the return pipe of the external cooling circuit, and the second opening is connected to the inlet pipe of the cooling circuit. The reversing structure is communicatively connected to the temperature detection mechanism and is used to switch between the first working state and the second working state according to the first temperature and the second temperature.

[0005] The above technical solution utilizes a heat dissipation system comprising a heat exchange plate, a temperature detection mechanism, and a reversing structure. The temperature detection mechanism uses a first temperature sensor to measure the coolant temperature at the first opening of the cooling channel in the heat exchange plate, and a second temperature sensor to measure the coolant temperature at the second opening of the cooling channel in the heat exchange plate. The reversing structure connects an external cooling circuit to the first and second openings of the heat exchange plate and has a first operating state and a second operating state. The reversing structure is communicatively connected to the temperature detection mechanism. The reversing structure switches between the first and second operating states based on the first and second temperatures. In the first operating state, the first opening is connected to the inlet pipe of the cooling circuit, and the second opening is connected to the return pipe of the cooling circuit. In the second operating state, the first opening is connected to the return pipe of the cooling circuit, and the second opening is connected to the inlet pipe of the cooling circuit. Thus, by switching between the first and second operating states through the reversing structure, the coolant flow entering the cooling channel of the heat exchanger plate can be redirected in a timely manner. This solves the problem of fixed coolant inlets and outlets in the original heat exchanger plate, which resulted in significantly lower heat dissipation efficiency for electrical components located at the rear end of the cooling channel compared to those at the front end, and a large temperature difference between the front and rear ends of the cooling channel. By switching between the first and second operating states through the reversing structure, coolant with a lower temperature can enter the cooling channel of the heat exchanger plate through either the first or second opening. This allows for more uniform heat dissipation for the electrical components on the heat exchanger plate, reducing the risk of thermal failure.

[0006] In some possible implementations, the reversing structure includes a housing and a valve core housed within the housing. The housing has four connection openings, two of which are respectively connected to the return and inlet lines of the cooling circuit, and the other two are respectively connected to the first and second openings. The valve core is configured to connect the first opening to the inlet pipe of the cooling circuit and the second opening to the return pipe of the cooling circuit through two connection openings, thereby switching the reversing structure to a first operating state; or, it can connect the first opening to the return pipe of the external cooling circuit and the second opening to the inlet pipe of the cooling circuit through two connection openings, thereby switching the reversing structure to a second operating state. Thus, the reversing structure has four connection openings on its housing, and a valve core is housed within the housing. These four connection openings are respectively connected to the return pipe of the cooling circuit, the inlet pipe of the cooling circuit, the first opening, and the second opening. Driving the valve core to rotate facilitates the switching of the reversing structure between the first and second operating states.

[0007] In some possible implementations, the temperature difference between the first temperature T1 measured by the first temperature sensor and the second temperature T2 measured by the second temperature sensor is... When temperature T is greater than a preset temperature value K1, the first and second operating states of the commutation structure are switched. Thus, the commutation structure adjusts its operation based on the temperature difference. When T is greater than the preset temperature value K1, switching between the first working state and the second working state allows the coolant at a lower temperature to enter the cooling channel of the heat exchange plate through the first opening, and then switches the coolant to enter the cooling channel of the heat exchange plate through the second opening. This changes the flow direction of the coolant in the cooling channel of the heat exchange plate, reduces the temperature difference between the front and rear of the cooling channel, makes the heat dissipation of the electrical components on the heat exchange plate more uniform, and reduces the risk of thermal failure.

[0008] In some possible implementations, the first temperature sensor and the second temperature sensor are respectively disposed on the inner sidewalls of the first opening and the second opening. Thus, by limiting the first temperature sensor to be disposed on the inner sidewall of the first opening, the first temperature sensor can more accurately measure the real-time temperature of the coolant at the first opening; similarly, by limiting the second temperature sensor to be disposed on the inner sidewall of the second opening, the second temperature sensor can more accurately measure the real-time temperature of the coolant at the second opening.

[0009] In some possible implementations, the four connection openings are located on the same side of the housing. This facilitates communication between the connection openings and the inlet and outlet lines of the cooling circuit, as well as the first and second openings, respectively.

[0010] In some possible implementations, the reversing structure further includes a driving element; the valve core includes a valve core body having a first flow channel structure and a second flow channel structure, and the driving element is drivenly connected to the valve core body to drive the first flow channel structure and the second flow channel structure to connect to different of the four connection openings to switch between the first operating state and the second operating state. This facilitates the driving element to rotate the valve core body to connect the first flow channel structure to the four connection openings, thereby switching the reversing structure to the first operating state; and the driving element to rotate the valve core body to connect the second flow channel structure to the four connection openings, thereby switching the reversing structure to the second operating state.

[0011] In some possible implementations, the first flow channel structure and the second flow channel structure extend in different directions. Thus, by having different extension directions, it is easier to connect the first or second flow channel structure to the four connecting openings, allowing the reversing structure to switch between a first operating state and a second operating state.

[0012] In some possible implementations, the four openings are arranged in an array on the same side of the housing, with the first flow channel structure extending vertically and the second flow channel structure extending laterally. Thus, by having the openings on the same side and the first flow channel structure extending laterally while the second flow channel structure extends vertically, it is easy to connect the four connecting openings via either the first or second flow channel structure, allowing the reversing structure to switch between a first operating state and a second operating state.

[0013] In some possible implementations, the first flow channel structure is disposed on a first side of the valve core body. The first flow channel structure includes a first sub-flow channel and a second sub-flow channel. When the reversing structure switches to the first working state, the first sub-flow channel is connected to the inlet pipe of the cooling circuit through two connecting openings. The second sub-flow channel is connected to the return pipe of the cooling circuit through two connecting openings. The second flow channel structure is located on the second side of the valve core body opposite to the first side. The second flow channel structure includes a third sub-flow channel and a fourth sub-flow channel. When the reversing structure switches to the second operating state, the third sub-flow channel connects the first opening to the return liquid pipe of the external cooling circuit through two connecting openings. The fourth sub-flow channel connects the second opening to the inlet liquid pipe of the cooling circuit through two connecting openings. Thus, the first sub-flow channel connects the first opening and the inlet liquid pipe, and the second sub-flow channel connects the second opening and the return liquid pipe, facilitating the rotation of the valve core body in the reversing structure to switch to the first operating state. Similarly, the third sub-flow channel connects the first opening and the return liquid pipe, and the fourth sub-flow channel connects the second opening and the inlet liquid pipe, facilitating the rotation of the valve core body in the reversing structure to switch to the second operating state.

[0014] In some possible implementations, the first opening and the second opening are arranged adjacent to each other. This facilitates communication between the inlet and outlet lines of the cooling circuit and the first and second openings, allowing the coolant in the cooling circuit to enter the cooling channels of the heat exchange plate through either the first or second opening.

[0015] In some possible implementations, the heat dissipation system further includes a controller, which is communicatively connected to the first temperature sensor and the second temperature sensor of the commutation structure and the temperature detection mechanism, respectively. Thus, the controller facilitates timely switching of the commutation structure; that is, the controller acquires the temperature detection results from the first and second temperature sensors, and when the results meet the switching requirements, the controller promptly controls the valve core to rotate and switch between the first and second operating states.

[0016] A second aspect of this disclosure provides a heat dissipation method for the aforementioned heat dissipation system, the method comprising: Obtain the first temperature T1 of the coolant at the first opening of the heat exchange plate; Obtain the second temperature T2 of the coolant at the second opening of the heat exchange plate; The switching structure is controlled to switch between a first operating state and a second operating state based on the first temperature T1 and the second temperature T2. Thus, when the power distribution box is equipped with the aforementioned heat dissipation system, the first temperature T1 of the first opening can be obtained from the first temperature sensor, and the second temperature T2 of the second opening can be obtained from the second temperature sensor. The switching structure then switches between the first and second operating states based on the detection of the first temperature T1 and the second temperature T2. This allows for a reversal of the cooling flow direction in the heat exchange plate, reducing the temperature difference between the electrical components positioned along the cooling flow channels on the heat exchange plate. This results in more uniform heat dissipation for the electrical components on the heat exchange plate and reduces the risk of thermal failure.

[0017] In some possible implementations, controlling the commutation structure to switch between a first operating state and a second operating state based on the first temperature T1 and the second temperature T2 includes: When the temperature difference between the first temperature T1 and the second temperature T2 When temperature T is greater than a preset temperature K1, the switching structure is controlled to switch between the first and second operating states. Thus, by limiting the temperature difference... When T is greater than the preset temperature value K1, the reversing structure is triggered to switch between the first and second working states, thereby reversing the flow direction of the cooling channels in the heat exchange plate. This reduces the temperature difference of the electrical components set along the cooling channels on the heat exchange plate, making the heat dissipation of the electrical components on the heat exchange plate more uniform and reducing the risk of thermal failure.

[0018] In some possible implementations, controlling the switching of the commutation structure between the first operating state and the second operating state based on the first temperature T1 and the second temperature T2 further includes: The difference between the preset temperature value K1, the hysteresis temperature K2, and the temperature value is calculated as follows: In the T comparison, the preset temperature K1 is greater than the hysteresis temperature K2. when When T > K1 + K2, the commutation structure is controlled to switch between the first working state and the second working state. When K1+K2≥ When T > K1, the reversing structure is controlled to maintain its original operating state. Thus, by introducing a hysteresis temperature K2, on the one hand, the number of reciprocating movements of the valve core and drive components can be reduced, extending the service life of the reversing structure; on the other hand, the impact, vibration, and noise caused by coolant reversal can be reduced, system ping-pong oscillations can be suppressed, the flow state of the coolant in the cooling channel and the controlled temperature can be kept stable, reducing the risk of malfunction, improving the continuous operating reliability of the heat dissipation system, and reducing the frequency of equipment maintenance.

[0019] In some possible implementations, when the temperature difference between the first temperature T1 and the second temperature T2 is... When T is greater than the preset temperature K1, controlling the switching structure to switch between the first and second working states also includes: When the reversing structure switches from the first working state to the second working state or from the second working state to the first working state... When the temperature difference When T≤K1-K2, it is confirmed that the commutation structure meets the conditions for switching between the first and second working states again; when When T > K1 + K2, the commutation structure is controlled to switch between a first operating state and a second operating state, where K2 is the hysteresis temperature and is less than a preset temperature K1. Thus, by limiting the preconditions for the commutation structure to switch operating states, i.e., when the temperature difference is... When temperature T drops below K1-K2, confirm that the commutation structure meets the conditions for switching back to the first and second operating states. Only when T > K1 + K2 can the commutation structure be allowed to switch again, thereby reducing the number of frequency switching, suppressing the ping-pong oscillation of the heat dissipation system, keeping the flow state of the cooling channel and the controlled temperature stable, reducing the risk of malfunction, and improving the continuous operation reliability of the heat dissipation system.

[0020] In some possible implementations, when the temperature difference value When T≤K1-K2, confirming that the commutation structure meets the conditions for switching between the first and second working states again also includes: the interval H1 between the commutation structure switching between the first and second working states again satisfies: H1≥ a preset time. Thus, by confirming that the commutation structure meets the conditions for switching between the first and second working states again, and by limiting the interval H1 between the commutation structure switching between the first and second working states again to be ≥ a preset time, the commutation structure can only perform the commutation operation after both conditions are confirmed. This reduces the frequency of commutation structure switching, keeps the flow state of the cooling channel and the controlled temperature stable, reduces the risk of malfunction, and improves the continuous operational reliability of the heat dissipation system.

[0021] In some possible implementations, the method further includes controlling the reversing structure to switch between a first operating state and a second operating state and issuing a warning command when either the first temperature T1 or the second temperature T2 exceeds a maximum temperature threshold K3. Thus, by limiting the maximum temperature threshold K3, when either the first temperature T1 or the second temperature T2 exceeds K3, the coolant temperature at the first opening or the coolant temperature at the second opening is too high, resulting in an excessively large temperature difference between the first temperature T1 and the second temperature T2. The reversing structure promptly switches between the first operating state and the second operating state to reduce the temperature difference between the first opening and the second opening, preventing thermal failure. Simultaneously, issuing a warning prompt facilitates timely maintenance by operators.

[0022] A third aspect of this disclosure provides a power distribution box including the aforementioned heat dissipation system.

[0023] In some possible implementations, the distribution box further includes multiple electrical components, including at least one of relays, fuses, busbars, and shunts, with the heat dissipation system used to cool at least one of these components. Thus, the electrical components can be one or more of relays, fuses, busbars, and shunts. The arrangement of multiple electrical components enables centralized power distribution, protection, and wiring management within the distribution box. Furthermore, the uniform heat dissipation of multiple components through the heat dissipation system reduces the risk of thermal failure.

[0024] In some possible implementations, the first opening and the second opening are located at the edge of the distribution box. This facilitates communication of the cooling circuit with the first and second openings via silicone tubing.

[0025] The fourth aspect of this disclosure provides a battery pack including a cooling circuit and the aforementioned power distribution box, wherein the inlet and outlet pipes of the cooling circuit are connected to a heat exchange plate through a reversing structure within the power distribution box.

[0026] The fifth aspect of this disclosure provides an electrical device including the battery pack described above.

[0027] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the accompanying drawings...

[0029] Figure 1 This is a schematic diagram of the internal structure of the power distribution box provided in an exemplary embodiment of this disclosure.

[0030] Figure 2 This is a bottom view of the heat exchange plate provided in an exemplary embodiment of this disclosure.

[0031] Figure 3 This is an exploded view of the reversing structure provided in an exemplary embodiment of this disclosure.

[0032] Figure 4 This is a schematic cross-sectional view of the reversing structure provided in an exemplary embodiment of this disclosure.

[0033] Figure 5 This is a schematic diagram of the first working state of the commutation structure provided in an exemplary embodiment of this disclosure.

[0034] Figure 6 This is a coolant flow direction diagram of the first working state of the reversing structure provided in the exemplary embodiment of this disclosure.

[0035] Figure 7 This is a schematic diagram of the second working state component of the commutation structure provided in an exemplary embodiment of this disclosure.

[0036] Figure 8 This is a coolant flow direction diagram of the second working state of the reversing structure provided in the exemplary embodiment of this disclosure.

[0037] Figure 9 This is a flowchart of a heat dissipation system provided in an exemplary embodiment of this disclosure.

[0038] Figure 10 This is a flowchart of a heat dissipation method provided in an exemplary embodiment of this disclosure.

[0039] Figure 11 This is a logic flowchart of the heat dissipation method provided in an exemplary embodiment of this disclosure.

[0040] Explanation of reference numerals in the attached figures 1-Heat exchange plate; 11-Cooling channel; 12-First opening; 13-Second opening; 2-Temperature detection mechanism; 21-First temperature sensor; 22-Second temperature sensor; 3-Reversing structure; 31-Housing; 32-Valve core; 33-Connection opening; 33a-First connection opening; 33b-Second connection opening; 33c-Third connection opening; 33d-Fourth connection opening; 34-Valve core body; 35-First channel structure; 351-First sub-channel; 352-Second sub-channel; 36-Second channel structure; 361-Third sub-channel; 362-Fourth sub-channel; 37-Driver; 4-Cooling circuit; 5-Electrical components; 6-Relay; 7-Fuse; 8-Wire bar; 9-Diverter; 10-Distribution box. Detailed Implementation

[0041] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0042] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to the upper, lower, left, and right of the corresponding figures. When the following description refers to the figures, unless otherwise indicated, the same numbers in different figures denote the same or similar elements.

[0043] The inventors discovered that the high-voltage distribution box of a vehicle's power battery is a core electrical component. This box integrates multiple high-power heat-generating electrical devices, which generate significant heat during high-power charging and discharging. To dissipate this heat, a heat dissipation structure is installed inside the distribution box housing. However, the heat dissipation structure in related technologies suffers from uneven heat dissipation, potentially leading to thermal runaway. In particular, the coolant flows unidirectionally within the heat dissipation structure, easily creating a temperature difference between the inlet and outlet. The coolant absorbs heat as it flows past the front-end electrical components, gradually increasing its temperature. By the time the coolant reaches the rear-end electrical components, its temperature has already risen significantly, resulting in a marked decrease in heat dissipation efficiency. Under high-power conditions, the temperature difference between the front and rear ends can exceed 10°C, causing the rear-end electrical components to overheat and posing a risk of thermal runaway.

[0044] To solve the above technical problems, such as Figures 1 to 8 As shown, in a first aspect of this disclosure, a heat dissipation system is provided, comprising: a heat exchange plate 1, a temperature detection mechanism 2, and a reversing structure 3. The heat exchange plate 1 includes a cooling channel 11, and a first opening 12 and a second opening 13 respectively communicating with the cooling channel 11. The temperature detection mechanism 2 includes a first temperature sensor 21 and a second temperature sensor 22. The first temperature sensor 21 is used to measure a first temperature T1 of the coolant temperature at the first opening 12, and the second temperature sensor 22 is used to measure a second temperature T2 of the coolant temperature at the second opening 13. The reversing structure 3 connects the external cooling circuit 4 and the first opening 12 and the second opening 13 of the heat exchange plate 1, and has a first working state and a second working state. In the first working state, the first opening 12 is connected to the liquid inlet pipe of the cooling circuit 4, and the second opening 13 is connected to the liquid return pipe of the cooling circuit 4. In the second working state, the first opening 12 is connected to the liquid return pipe of the external cooling circuit 4, and the second opening 13 is connected to the liquid inlet pipe of the cooling circuit 4. The reversing structure 3 is communicatively connected to the temperature detection mechanism 2 and is used to switch between the first working state and the second working state according to the first temperature T1 and the second temperature T2.

[0045] The above technical solution uses a heat dissipation system comprising a heat exchange plate 1, a temperature detection mechanism 2, and a reversing structure 3. The temperature detection mechanism 2 uses a first temperature sensor 21 to measure the first temperature T1 of the coolant at the first opening 12 of the cooling channel 11 in the heat exchange plate 1, and a second temperature sensor 22 to measure the second temperature T2 of the coolant at the second opening 13 of the cooling channel 11 in the heat exchange plate 1. The reversing structure 3 connects to an external cooling circuit 4 and the first opening 12 and the second opening 13 of the heat exchange plate 1. The reversing structure 3 is communicatively connected to the temperature detection mechanism 2, and switches between a first operating state and a second operating state based on the first temperature T1 and the second temperature T2. In the first operating state, the first opening 12 is connected to the inlet pipe of the cooling circuit 4, and the second opening 13 is connected to the return pipe of the cooling circuit 4. In the second operating state, the first opening 12 is connected to the return pipe of the cooling circuit 4, and the second opening 13 is connected to the inlet pipe of the cooling circuit 4. Thus, by switching between the first and second operating states through the reversing structure 3, the coolant entering the cooling channel 11 of the heat exchange plate 1 can be redirected in a timely manner. This solves the problem of the original heat exchange plate 1 having fixed coolant inlets and outlets, resulting in significantly lower heat dissipation efficiency for electrical components located at the rear end of the cooling channel 11 compared to those at the front end, and a large temperature difference between the first opening 12 and the second opening 13 of the cooling channel 11. By switching between the first and second operating states through the reversing structure 3, coolant with a lower temperature can enter the cooling channel 11 of the heat exchange plate 1 through the first opening 12, or through the second opening 13. This allows for more uniform heat dissipation for the electrical components on the heat exchange plate 1, reducing the risk of thermal failure.

[0046] It is understood that the heat dissipation system may include a controller, which may be set up independently or shared with the control module in the commutation structure 3. In this embodiment, the controller is set up independently and is communicatively connected to both the commutation structure 3 and the temperature detection mechanism 2. The controller is used to switch between the first operating state and the second operating state based on the temperature detection results of the first temperature sensor 21 and the second temperature sensor 22. In some possible embodiments, when the temperature difference between the first temperature T1 measured by the first temperature sensor 21 and the second temperature T2 measured by the second temperature sensor 22 is... When T is greater than the preset temperature value K1, the first and second working states of the reversing structure 3 are switched. Thus, by limiting the preset temperature value K1, the difference between the first temperature T1 at the first opening 12 and the second temperature T2 at the second opening 13 is within a preset range, thereby reducing the temperature difference between the front and rear electrical components of the cooling channel, making the heat dissipation of each electrical component more uniform, and reducing the risk of thermal failure.

[0047] In some possible implementations, the commutation structure 3 is based on the temperature difference. T is compared with the preset temperature value K1, when the temperature difference is... When T is greater than the preset temperature value K1, the switching state of the commutation structure 3 is triggered. That is, the controller controls the commutation structure 3 to switch between the first working state and the second working state. For example, the initial state is the first working state. At this time, the controller controls the commutation structure 3 to switch from the first working state to the second working state, so that the coolant with a lower temperature can enter the cooling channel 11 of the heat exchange plate through the first opening 12, and switch to the coolant entering the cooling channel 11 of the heat exchange plate 1 through the second opening 13. Changing the flow direction of the coolant in the cooling channel 11 of the heat exchange plate 1 can reduce the temperature difference of the heat dissipation of the electrical components 5 at the front and rear ends of the cooling channel 11, so that the heat dissipation of the electrical components 5 on the heat exchange plate 1 is more uniform.

[0048] It is understood that the external cooling circuit 4 mentioned above is a device capable of circulating and providing low-temperature coolant. When the above heat dissipation system is applied to the battery pack, the external cooling circuit 4 can be shared with the battery pack's cell cooling circuit.

[0049] In some possible implementations, the preset temperature value K1 can be set within the range of 3°C to 8°C. For example, when K1 = 5°C, the temperature difference value... When T > 5℃, the switching state of the commutation structure 3 is triggered, that is, the controller controls the commutation structure 3 to switch between the first working state and the second working state. In this way, by setting the preset temperature value K1 to 5℃, the temperature difference between the first opening 12 and the second opening 13 can be controlled within a range of 5℃, thereby making the heat dissipation of the electrical components 5 at the front and rear ends of the cooling channel 11 more uniform and reducing the risk of thermal runaway.

[0050] Of course, the preset temperature value K1 of 5°C mentioned above is illustrative. In other embodiments, the preset temperature value K1 can also be other values, such as 3°C, 4°C, 6°C, 7°C and 8°C.

[0051] In some possible implementations, the first temperature sensor 21 and the second temperature sensor 22 are respectively disposed on the inner sidewalls of the first opening 12 and the second opening 13. For example, the first temperature sensor 21 and the second temperature sensor 22 can be NTC (Negative Temperature Coefficient) thermistors with an accuracy of ±0.5℃ and a response time of less than 1 second. The first temperature sensor 21 is installed on the inner sidewall of the first opening 12, and the second temperature sensor 22 is installed on the inner sidewall of the second opening 13, thereby enabling the first temperature sensor 21 and the second temperature sensor 22 to be in direct contact with the coolant, thereby improving the measurement accuracy.

[0052] In some possible implementations, the heat exchange plate 1 can be made of aluminum alloy, and the cooling channels 11 in the heat exchange plate 1 are curved and extended to adapt to the installation positions of different electrical components 5, enabling the coolant in the cooling channels 11 to cool and dissipate heat from multiple electrical components 5. When the heat dissipation system is applied to the distribution box 10 of the battery pack, the heat exchange plate 1 can be the base plate of the distribution box 10, integrally formed with the distribution box 10. Of course, the heat exchange plate 1 can also be separately fixed on the base plate of the distribution box 10.

[0053] In some possible implementations, the reversing structure 3 includes a housing 31 and a valve core 32 housed within the housing 31. The housing 31 has four connection openings 33, two of which are connected to the return and inlet pipes of the external cooling circuit 4, respectively. The other two openings are connected to the first opening 12 and the second opening 13, respectively. All four openings 33 can be connected to the corresponding first opening 12, second opening 13, return pipe, and inlet pipe via silicone tubing. Figures 5 to 8 As shown, the four connection openings 33 are the first connection opening 33a, the second connection opening 33b, the third connection opening 33c, and the fourth connection opening 33d. The first connection opening 33a is connected to the first opening 12, the second connection opening 33b is connected to the second opening 13, the third connection opening 33c is connected to the liquid inlet pipe of the cooling circuit 4, and the fourth connection opening 33d is connected to the liquid return pipe of the cooling circuit 4. The valve core 32 is configured to connect the first opening 12 to the liquid inlet pipe of the cooling circuit 4 and the second opening 13 to the liquid return pipe of the cooling circuit 4 through two connection openings 33, so that the reversing structure 3 can be switched to the first working state; or it can connect the first opening 12 to the liquid return pipe of the external cooling circuit 4 and the second opening 13 to the liquid inlet pipe of the cooling circuit 4 through two connection openings 33, so that the reversing structure 3 can be switched to the second working state.

[0054] In some possible implementations, the reversing structure 3 further includes a drive member 37. The valve core 32 is rotatably disposed within the housing 31. The valve core 32 may include a valve core body 34 having a first flow channel structure 35 and a second flow channel structure 36. The drive member 37 is drivenly connected to the valve core body 34 to drive the first flow channel structure 35 and the second flow channel structure 36 to connect different connection openings 33 among four connection openings 33 to switch between the first working state and the second working state. The valve core 32 may be arranged vertically with the housing 31, that is, the valve core body 34 is entirely placed in the cavity of the housing 31 and the valve core body 34 is sealed to the housing 31. The drive member 37 is located outside the housing 31. The drive member 37 may be a drive motor. A drive shaft may be provided at the upper end of the valve core body 34. The output end of the drive motor is drivenly connected to the drive shaft of the valve core body 34 so that the valve core body 34 is rotated by the forward and reverse rotation of the drive motor to switch between the first working state and the second working state. The valve core body 34 is provided with independent first flow channel structure 35 and second flow channel structure 36. One of the first flow channel structure 35 and the second flow channel structure 36 is selectively connected to four connecting openings 33. A drive motor drives the valve core body 34 to rotate by a first preset angle, connecting the first flow channel structure 35 to the four connecting openings 33, thus switching the reversing structure 3 to a first working state. When a change in direction is required, the drive motor continues to drive the valve core body 34 to rotate by a second preset angle, connecting the second flow channel structure 36 to the four connecting openings 33, thus switching the reversing structure 3 to a second working state. Therefore, by driving the valve core body 34 to rotate, the drive motor connects one of the first flow channel structure 35 and the second flow channel structure 36 to the four connecting openings 33, allowing the reversing structure 3 to switch between the first and second working states.

[0055] It is understood that the aforementioned drive motor can be a forward / reverse motor or a unidirectional motor. When the drive motor is a forward / reverse motor, the initial working state of the reversing structure 3 can be the first working state. At this time, the first flow channel structure 35 on the valve core 32 is connected to the four corresponding connection openings 33. When switching is required, the drive motor rotates forward to switch the reversing structure 3 from the first working state to the second working state. At this time, the second flow channel structure 36 on the valve core 32 is connected to the four corresponding connection openings 33. When switching is required again, that is, when the reversing structure 3 switches from the second working state to the first working state, the drive motor can be controlled to rotate by a preset angle. At this time, the first flow channel structure 35 on the valve core 32 is connected to the four corresponding connection openings 33.

[0056] Of course, the above-mentioned drive motor can be a forward and reverse reversible motor as an illustration. In other embodiments, the drive motor can also be a motor that rotates in a single direction. In this case, the drive motor rotates cyclically by a preset angle in the direction of rotation to achieve the switching between the first working state and the second working state of the commutation structure 3.

[0057] To facilitate the connection of the four connection openings 33 to the first opening 12, the second opening 13, the inlet pipe of the cooling circuit, and the return pipe of the cooling circuit, respectively, in some possible embodiments, the four connection openings 33 are located on the same side of the housing 31. For example... Figure 5 As shown, the first connection opening 33a, the second connection opening 33b, the third connection opening 33c, and the fourth connection opening 33d are all located on the same side of the housing 31, thus facilitating the connection opening 33 to connect to the corresponding first opening 12, second opening 13, the liquid inlet pipe of the cooling circuit 4, and the liquid return pipe of the cooling circuit 4 via silicone tubing. Interfaces can be provided on both the liquid inlet pipe and the liquid return pipe, and quick-connect fittings can be provided at both ends of the silicone tubing. These quick-connect fittings enable communication between the first connection opening 33a and the first opening 12, between the second connection opening 33b and the second opening 13, between the third connection opening 33c and the liquid inlet pipe, and between the fourth connection opening 33d and the liquid return pipe.

[0058] Of course, in some possible implementations, the first connection opening 33a, the second connection opening 33b, the third connection opening 33c, and the fourth connection opening 33d are all located on the same side of the housing 31, which can also facilitate the manufacturing of the first flow channel structure 35 and the second flow channel structure 36 distributed throughout the valve core body 34. For example, the first flow channel structure 35 can be disposed on the first side of the valve core body 34 and extend vertically, and the second flow channel structure 36 can be disposed on the second side of the valve core body 34 opposite to the first side and extend horizontally. In this way, when the reversing structure 3 switches between the first working state and the second working state, the valve core body 34 is driven to rotate so that the first flow channel structure 35 is connected to the first connection opening 33a, the second connection opening 33b, the third connection opening 33c, and the fourth connection opening 33d respectively; when the valve core body 34 is rotated, the second flow channel structure 36 is switched to connect to the first connection opening 33a, the second connection opening 33b, the third connection opening 33c, and the fourth connection opening 33d respectively.

[0059] In some possible implementations, a first flow channel structure 35 is disposed on a first side of the valve core body 34. The first flow channel structure 35 includes a first sub-flow channel 351 and a second sub-flow channel 352. When the reversing structure 3 is in a first working state, the first sub-flow channel 351 connects the first connecting opening 33a and the third connecting opening 33c, and the second sub-flow channel 352 connects the second connecting opening 33b and the fourth connecting opening 33d. This allows the first sub-flow channel 351 to connect the first opening 12 to the liquid inlet pipe of the cooling circuit 4, and the second sub-flow channel 352 to connect the second opening 13 to the liquid return pipe of the cooling circuit 4. Figure 5 As shown, the valve core body 34 includes a first side and a second side disposed opposite to each other along a first direction, wherein the first direction can be referenced... Figure 5In the X direction, a first flow channel structure 35 is disposed on a first side of the valve core body 34, and a second flow channel structure 36 is disposed on a second side of the valve core body 34. To facilitate switching between the first and second operating states by the reversing structure, the first flow channel structure 35 and the second flow channel structure 36 on the valve core body 34 extend in different directions. The valve core body 34 may include a main plate extending along a second direction, which can be referenced... Figure 5 In the Y direction, and in the second direction, annular baffles are respectively provided at the top and bottom of the main board. The valve core body 34 includes a first side surface and a second side surface that are arranged opposite to each other in the first direction, respectively corresponding to the first side wall surface and the second side wall surface that are arranged opposite to each other in the first direction of the main board. At this time, a vertical space is formed between the first side wall surface and the two annular baffles. The vertical direction is the same as the second direction. For details, please refer to [reference needed]. Figure 5 In the Y direction, the first flow channel structure 35 extends vertically. A first partition is provided on the first side wall of the main board to divide the space enclosed by the first side wall of the main board and the two annular baffles into two independent vertically extending sub-spaces. These two sub-spaces correspond to the first sub-flow channel 351 and the second sub-flow channel 352, respectively. The first sub-flow channel 351 and the second sub-flow channel 352 together constitute the first flow channel structure 35. When the reversing structure 3 is in the first working state, the first sub-flow channel 351 connects the first opening 12 to the liquid inlet pipe of the cooling circuit 4, and the second sub-flow channel 352 connects the second opening 13 to the liquid return pipe of the cooling circuit 4. Thus, the low-temperature coolant in the cooling circuit 4 can enter the heat exchange plate through the first opening 12 and then flow back into the cooling circuit 4 through the second opening 13.

[0060] In some possible implementations, the second flow channel structure 36 extends laterally, and a second partition is provided on the second sidewall of the motherboard. The second partition extends laterally, and the lateral direction can be referenced here. Figure 7In the Z direction, the space enclosed by the second side wall of the motherboard and the two annular baffles is divided into two independent sub-spaces extending laterally by the setting of the second baffle. The two sub-spaces here correspond to the third sub-flow channel 361 and the fourth sub-flow channel 362 respectively. The third sub-flow channel 361 and the fourth sub-flow channel 362 together constitute the second flow channel structure 36. When the reversing structure 3 is in the second working state, the third sub-flow channel 361 connects the first connecting opening 33a and the fourth connecting opening 33d, and the fourth sub-flow channel 362 connects the second connecting opening 33b and the third connecting opening 33c. That is, the third sub-flow channel 361 connects the first opening 12 to the return pipe of the external cooling circuit 4, and the fourth sub-flow channel 362 connects the second opening 13 to the inlet pipe of the cooling circuit 4. When the reversing structure 3 switches from the first working state to the second working state, since the first flow channel structure 35 is located on the first side of the valve core body 34 and the second flow channel structure 36 is located on the back of the valve core body 34, the drive motor needs to drive the valve core body 34 to rotate 180° to achieve the switching between the first working state and the second working state.

[0061] In some possible implementations, a first partition disposed on the first sidewall of the motherboard extends along a first direction, and a second partition is disposed perpendicular to the first partition, such as... Figure 5 and Figure 6 As shown, the first direction can be referenced to the X direction, the extension direction of the second partition is the same as the vertical direction, and can be referenced to the Y direction. The lateral direction can be referenced to the Z direction. Thus, it is convenient to switch the reversing structure 3. When switching to the first working state, the first sub-flow channel 351 connects the first opening 12 to the liquid inlet pipe of the cooling circuit 4, and the second sub-flow channel 352 connects the second opening 13 to the liquid return pipe of the cooling circuit 4. When switching to the second working state, the third sub-flow channel 361 connects the first opening 12 to the liquid return pipe of the external cooling circuit 4, and the fourth sub-flow channel 362 connects the second opening 13 to the liquid inlet pipe of the cooling circuit 4.

[0062] In some possible implementations, such as Figure 1 As shown, the first opening 12 and the second opening 13 are arranged adjacent to each other. This allows for easy connection of the inlet and return lines of the cooling circuit 4 to the first opening 12 and the second opening 13 via silicone tubing.

[0063] like Figures 8 to 10 As shown, a second aspect of this disclosure provides a heat dissipation method for the aforementioned heat dissipation system, the method comprising: S10. Obtain the first temperature T1 of the coolant at the first opening 12 of the heat exchange plate 1; S20, Obtain the second temperature T2 of the coolant at the second opening 13 of the heat exchange plate 1; S30. Control the reversing structure 3 to switch between the first working state and the second working state according to the first temperature T1 and the second temperature T2.

[0064] Thus, when the power distribution box 10 is equipped with the aforementioned heat dissipation system, it can obtain the first temperature T1 of the first opening 12 based on the first temperature sensor 21 and the second temperature T2 of the second opening 13 based on the second temperature sensor 22, and switch the first and second operating states of the reversing structure according to the detection results of the first temperature T1 and the second temperature T2. This allows the flow direction of the cooling channels 11 in the heat exchange plate 1 to be reversed, reducing the temperature difference of the electrical components 5 arranged along the cooling channels 11 on the heat exchange plate 1, resulting in more uniform heat dissipation of the electrical components 5 on the heat exchange plate 1 and reducing the risk of thermal failure.

[0065] In some possible implementations, the switching structure 3 is controlled to switch between the first operating state and the second operating state based on the first temperature T1 and the second temperature T2, including: further including when the temperature difference between the first temperature T1 and the second temperature T2 is... When T is greater than the preset temperature value K1, the control switching structure 3 switches between the first working state and the second working state. Thus, by limiting the preset temperature value K1, the difference between the first temperature T1 at the first opening 12 and the second temperature T2 at the second opening 13 is within the preset range, thereby reducing the temperature difference between the front and rear electrical components 5 of the cooling channel 11, making the heat dissipation of each electrical component 5 more uniform, and reducing the risk of thermal failure.

[0066] Specifically, the commutation structure 3 is based on the temperature difference. T is compared with the preset temperature value K1, when the temperature difference is... When T is greater than the preset temperature value K1, the switching state of the commutation structure 3 is triggered. That is, the controller controls the commutation structure 3 to switch between the first working state and the second working state. For example, the initial state is the first working state. At this time, the controller controls the commutation structure 3 to switch from the first working state to the second working state, so that the coolant with a lower temperature can enter the cooling channel 11 of the heat exchange plate 1 through the first opening 12, and switch to the coolant entering the cooling channel 11 of the heat exchange plate 1 through the second opening 13. Changing the flow direction of the coolant in the cooling channel 11 of the heat exchange plate 1 can reduce the temperature difference between the front end and the rear end of the cooling channel 11, so that the heat dissipation of the electrical components 5 on the heat exchange plate 1 is more uniform.

[0067] In some possible implementations, the preset temperature value K1 can be set between 3°C and 8°C. For example, when the preset temperature value K1 is 5°C, the temperature difference is... When T > 5℃, the switching state of the commutation structure 3 is triggered, that is, the controller controls the commutation structure 3 to switch between the first working state and the second working state. In this way, by setting the preset temperature value K1 to 5℃, the temperature difference between the first opening 12 and the second opening 13 can be controlled within a range of 5℃, so that the heat dissipation of the electrical components 5 at the front and rear ends of the cooling channel 11 is more uniform, reducing the risk of thermal runaway.

[0068] In some possible implementations, controlling the switching structure 3 to switch between the first operating state and the second operating state based on the first temperature T1 and the second temperature T2 further includes: the difference between the preset temperature value K1, the superimposed hysteresis temperature K2, and the temperature difference. T comparison, where the preset temperature K1 is greater than the hysteresis temperature K2, when When T > K1 + K2, the control commutation structure 3 switches between the first and second operating states; when K1 + K2 ≥ When T > K1, the control reversing structure 3 maintains its original working state. By introducing a hysteresis temperature K2, on the one hand, the number of reciprocating movements of the valve core 32 and the drive component 37 can be reduced, extending the service life of the reversing structure; on the other hand, the impact, vibration and noise caused by coolant reversal can be reduced, the system's ping-pong oscillation can be suppressed, the flow state of the coolant in the cooling channel and the controlled temperature can be kept stable, the risk of malfunction can be reduced, the continuous operation reliability of the heat dissipation system can be improved, and the maintenance frequency of the equipment can be reduced.

[0069] It is understandable that the hysteresis temperature K2 mentioned above refers to the difference between the start threshold and the stop threshold. By setting the hysteresis temperature K2, the frequent reversing and oscillation of the commutation structure 3 can be prevented.

[0070] In some possible implementations, the hysteresis temperature K2 satisfies: K2 ≤ 1℃. For example, when the hysteresis temperature K2 is 1℃, and the preset temperature value K1 is 5℃, the initial state of the commutation structure 3 can be the first operating state. When T > 6℃, the reversing structure 3 meets the reversing conditions. At this time, the controller controls the reversing structure 3 to switch from the first working state to the second working state. This changes the cooling liquid from entering the heat exchange plate 1 through the first opening 12 and returning through the second opening 13 to entering the heat exchange plate 1 through the second opening 13 and returning through the first opening 12. This allows for more uniform heat dissipation of the electrical components at the front and rear ends of the cooling channel 11 on the heat exchange plate 1, reducing the risk of thermal runaway. When 6℃ > When T > 5℃, the reversing structure 3 maintains its original working state, thereby suppressing the ping-pong oscillation of the system, keeping the flow state of the coolant in the cooling channel 11 and the controlled temperature stable, reducing the risk of malfunction, and improving the continuous operation reliability of the heat dissipation system.

[0071] In some possible implementations, when the temperature difference between the first temperature T1 and the second temperature T2 is When T is greater than the preset temperature K1, the control of the commutation structure 3 switches between the first working state and the second working state. This also includes: after the commutation structure 3 switches from the first working state to the second working state or from the second working state to the first working state, when the temperature difference... When T≤K1-K2, it is confirmed that the commutation structure 3 satisfies the condition for switching between the first and second working states again; when When T > K1 + K2, the control commutation structure 3 switches between the first and second operating states, where K2 is the hysteresis temperature and is less than the preset temperature K1. To avoid frequent switching of the commutation structure 3, after a switch occurs, the conditions for the next switch need to be confirmed. This can be understood as the temperature difference after the commutation structure 3 switches. T will first decrease and then increase, the temperature difference. As T decreases, the temperature difference When T≤K1-K2, confirm that the commutation structure 3 meets the conditions for switching back to the first and second working states, and the temperature difference value. After T decreases to its minimum value, it begins to increase. When T > K1 + K2, the control commutation structure 3 switches between the first and second operating states. Thus, by limiting the preconditions for switching of the commutation structure 3, the number of switching operations is reduced, ping-pong oscillations in the heat dissipation system are suppressed, the flow state of the cooling channel 11 and the controlled temperature remain stable, the risk of malfunction is reduced, and the continuous operation reliability of the heat dissipation system is improved.

[0072] Specifically, when the hysteresis temperature K2 is 1℃, and the preset temperature value K1 is 5℃, after the reversing structure 3 switches between the first and second working states, the temperature difference is... T needs to drop from a higher temperature, when the temperature difference is... Temperature T drops to 4°C, confirming that the commutation structure 3 meets the conditions for the next switching. As heat dissipation continues, the temperature difference between the first opening 12 and the second opening 13... T will continue to decrease until it reaches its minimum value, then begin to rise again. At this point, when the temperature difference... T rose again, when When T > 6℃, the commutation structure 3 meets the commutation conditions. At this time, the controller controls the commutation structure 3 to commutate, that is, to switch from the first working state to the second working state.

[0073] In some possible implementations, when the power distribution box is applied to the vehicle's power battery pack, during the fast charging condition of the battery pack, the electrical components 5 operate under high power conditions, generating a large amount of heat. The preset temperature value K1 can be set to 3°C, thereby enabling active switching so that the temperature of the first opening 12 and the second opening 13 of the cooling channel 11 on the heat exchange plate 1 remains within the preset range under high power conditions, thus enabling the multiple electrical components 5 on the heat exchange plate 1 to dissipate heat evenly. When the battery pack is in a low power discharge condition, the preset temperature value K1 can be set to 8°C to reduce the sensitivity of the switching commutation structure 3, thereby reducing unnecessary switching.

[0074] Furthermore, in some possible implementations, when the temperature difference... When T≤K1-K2, it is confirmed that the commutation structure 3 meets the conditions for switching back to the first and second working states, which also includes: the interval H1 between the commutation structure 3 switching back to the first and second working states satisfies: H1≥preset time. After the commutation structure 3 reverses, when the temperature difference... When T≤K1-K2, first confirm that the reversing structure 3 meets the conditions for switching between the first and second working states again. Then, it is necessary to judge through the gap time H1. When H1≥ the preset time, the temperature difference value is... After T decreases to its minimum value, it begins to increase. When T > K1 + K2, the control switching structure 3 will be triggered to switch between the first and second working states. In this way, by limiting the two triggering switching conditions, the number of switching operations can be reduced, the flow state of the cooling channel 11 and the controlled temperature can be kept stable, the risk of malfunction can be reduced, and the continuous operation reliability of the heat dissipation system can be improved.

[0075] In some possible implementations, the preset time can be 60 seconds, that is, the interval H1 between the switching structure 3 switching between the first working state and the second working state again satisfies: H1≥60s.

[0076] In some possible implementations, the heat dissipation method further includes, when either the first temperature T1 or the second temperature T2 exceeds a maximum temperature threshold K3, the controller controls the reversing structure to switch between the first and second operating states and issues a warning command. By limiting the maximum temperature threshold K3, when either the first temperature T1 or the second temperature T2 exceeds K3, for example, the maximum temperature threshold K3 can be 85°C, then when either T1 or T2 exceeds 85°C, the temperature difference between the first temperature T1 and the second temperature T2 will decrease. If T is too large, the switching structure 3 is forcibly controlled to switch between the first and second working states in a timely manner, so as to reduce the temperature difference between the first opening 12 and the second opening 13. T, to avoid thermal failure. Of course, under the above operating conditions, there is also the possibility that the first temperature sensor 21 and / or the second temperature sensor 22 may malfunction, leading to abnormal data. In this case, issuing a warning command will facilitate timely repair by the operator. It can be understood that the above warning command can refer to an audible warning via a buzzer or a display device.

[0077] like Figure 11 As shown, the implementation method of the heat dissipation method logic control is as follows: In the initial state, the reversing structure 3 is in the first working state, and the control switching timer is cleared. At this time, the liquid inlet pipe of the cooling circuit 4 is connected to the first opening 12, and the return pipe of the cooling circuit 4 is connected to the second opening 13. At this time, the coolant oil enters the cooling channel 11 through the first opening 12 and then flows back to the cooling circuit 4 through the second opening 13. The first temperature T1 is obtained by the first temperature sensor 21, and the second temperature T2 is obtained by the second temperature sensor 22. When the first temperature T1 and the second temperature T2 are collected, multiple data can be taken within the sampling period and the average value is calculated as the actual output value. For example, when the first temperature T1 is collected, it can be sampled once every 100ms within the sampling interval of 100ms to 1s, and the average value is calculated based on the multiple sampled values ​​and the average value is used as the first temperature T1 output. The second temperature T2 can be obtained with reference to the value of the first temperature T1, and the temperature difference is calculated by subtracting the results of the first temperature T1 and the second temperature T2. T represents the temperature difference. Compare T with the preset temperature value K1. When T≤K1, maintain the current operating state, continue to measure the first temperature T1 and the second temperature T2, and calculate the temperature difference. Let T be the hysteresis temperature K2. Then, if K1 + K2 ≥ When T > K1, the hysteresis temperature exists, maintaining the current operating state. Continue measuring the first temperature T1 and the second temperature T2, and calculate the temperature difference. T, if When T > K1 + K2, the commutation structure 3 switches between the first and second operating states, completing the first switch. After the switch, the controller updates the roles of the first temperature sensor 21 and the second temperature sensor 22. That is, in the second operating state, the first temperature sensor 21 corresponds to the temperature of the second opening 13, and the second temperature sensor 22 corresponds to the temperature of the first opening 12. The controller also controls the switching timer to record one switch and the switching time, sets the switching flag, and restarts the temperature difference calculation and monitoring. The temperature difference value after the commutation is recorded. T will first decrease and then increase, after the switch When T > K1 + K2, it is also necessary to determine The confirmation conditions are T≤K1-K2 and H1≥60s, where H1 is the interval between the first and second working states. After both conditions are met, and... The next switch will only occur when T > K1 + K2, and this cycle will continue indefinitely.

[0078] like Figure 1 As shown, a third aspect of this disclosure provides a power distribution box including the aforementioned heat dissipation system. It is understood that the aforementioned power distribution box incorporates all the beneficial effects of the aforementioned heat dissipation system, which will not be elaborated upon here.

[0079] In some possible implementations, the distribution box 10 also includes a plurality of electrical components 5, which include at least one of a relay 6, a fuse 7, a cable strip 8, and a shunt 9. A heat dissipation system is used to cool at least one electrical component 5. For example, the electrical component 5 can be a relay 6, a fuse 7, a cable strip 8, and a shunt 9. The relay 6, fuse 7, cable strip 8, and shunt 9 are disposed on a heat exchange plate 1 of the distribution box 10. The coolant flowing through the heat exchange plate 1 can dissipate heat evenly to the plurality of electrical components 5, reducing the risk of thermal failure of the electrical components 5 within the distribution box 10.

[0080] In some possible implementations, the first opening 12 and the second opening 13 are located at the edge of the distribution box 10. For example... Figure 1 As shown, the heat exchange plate 1 in the power distribution box 10 can be rectangular. The first opening 12 and the second opening 13 are set close to one corner of the rectangle. Thus, when the cooling circuit 4 is connected to the first opening 12 and the second opening 13 through the silicone tube, interference between the two silicone tubes can be avoided and the arrangement of the two silicone tubes can be facilitated.

[0081] This disclosure provides a fourth aspect of a battery pack, including a cooling circuit and the aforementioned distribution box. The inlet and outlet pipes of the cooling circuit 4 are connected to a heat exchange plate 1 via a reversing structure 3 within the distribution box 10. The cooling circuit 4 is used to cool the battery cells in the battery pack. Interfaces are provided on the inlet and outlet pipes of the cooling circuit 4. These interfaces are connected to two connection openings 33 in the reversing structure 3 via silicone tubing. The other two connection openings 33 in the reversing structure 3 are connected to a first opening 12 and a second opening 13 in the heat exchange plate 1 via silicone tubing. By switching between a first operating state and a second operating state using the reversing structure 3, coolant can enter the heat exchange plate through the first opening 12 or the second opening 13. This reduces the temperature difference between the near and far ends of the cooling channel 11 of the heat exchange plate 1, enabling uniform heat dissipation from multiple electrical components 5 and reducing the risk of thermal failure.

[0082] This disclosure provides a fifth aspect of an electrical device, including the aforementioned battery pack. The electrical device can be a vehicle, which can be a new energy vehicle or a hybrid vehicle. All the beneficial effects of the aforementioned vehicle including the battery pack will not be elaborated here.

[0083] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0085] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A heat dissipation system, characterized in that, include: The heat exchange plate includes a curved and extended cooling channel, and a first opening and a second opening respectively communicating with the cooling channel; The temperature detection mechanism includes a first temperature sensor and a second temperature sensor. The first temperature sensor is used to detect a first temperature of the coolant at the first opening, and the second temperature sensor is used to detect a second temperature of the coolant at the second opening. and The reversing structure connects the external cooling circuit and the first opening and the second opening, and has a first working state and a second working state. In the first working state, the first opening is connected to the liquid inlet pipe of the cooling circuit, and the second opening is connected to the liquid return pipe of the cooling circuit. In the second working state, the first opening is connected to the return pipe of the external cooling circuit, and the second opening is connected to the inlet pipe of the cooling circuit. The reversing structure is communicatively connected to the temperature detection mechanism and is used to switch between the first working state and the second working state according to the first temperature and the second temperature.

2. The heat dissipation system according to claim 1, characterized in that, The reversing structure includes a housing and a valve core housed within the housing. The housing has four connection openings, two of which are connected to the return and inlet pipes of the cooling circuit, respectively, and the other two are connected to the first and second openings, respectively. The valve core is configured to connect the first opening to the inlet pipe of the cooling circuit and the second opening to the return pipe of the cooling circuit through the two connection openings, so that the reversing structure switches to a first working state; or, it can connect the first opening to the return pipe of the external cooling circuit and the second opening to the inlet pipe of the cooling circuit through the two connection openings, so that the reversing structure switches to a second working state.

3. The heat dissipation system according to claim 1, characterized in that, The temperature difference between the first temperature T1 measured by the first temperature sensor and the second temperature T2 measured by the second temperature sensor When T is greater than the preset temperature value K1, the first working state and the second working state of the reversing structure are switched.

4. The heat dissipation system according to claim 1, characterized in that, The first temperature sensor and the second temperature sensor are respectively disposed on the inner sidewalls of the first opening and the second opening.

5. The heat dissipation system according to claim 2, characterized in that, The four connection openings are located on the same side of the housing.

6. The heat dissipation system according to claim 2, characterized in that, The reversing structure further includes a driving component; the valve core includes a valve core body having a first flow channel structure and a second flow channel structure, and the driving component is connected to the valve core body to drive the first flow channel structure and the second flow channel structure to connect to different of the four connection openings to switch the first working state and the second working state.

7. The heat dissipation system according to claim 6, characterized in that, The first flow channel structure and the second flow channel structure extend in different directions.

8. The heat dissipation system according to claim 7, characterized in that, The four openings are arranged in an array on the same side of the housing, with the first flow channel structure extending vertically and the second flow channel structure extending laterally.

9. The heat dissipation system according to claim 6, characterized in that, The first flow channel structure is disposed on a first side of the valve core body. The first flow channel structure includes a first sub-flow channel and a second sub-flow channel. When the reversing structure switches to the first working state, the first sub-flow channel is connected to the inlet pipe of the cooling circuit through two connecting openings. The second sub-flow channel is connected to the return pipe of the cooling circuit through two connecting openings. The second flow channel structure is located on the second side of the valve core body opposite to the first side. The second flow channel structure includes a third sub-flow channel and a fourth sub-flow channel. When the reversing structure is switched to the second working state, the third sub-flow channel is connected to the first opening and the return liquid pipeline of the external cooling circuit through two connecting openings connected thereto. The fourth sub-flow channel is connected to the second opening and the inlet liquid pipeline of the cooling circuit through two connecting openings connected thereto.

10. The heat dissipation system according to claim 1, characterized in that, The first opening and the second opening are arranged adjacent to each other.

11. The heat dissipation system according to any one of claims 1-10, characterized in that, The heat dissipation system also includes a controller, which is communicatively connected to the first temperature sensor and the second temperature sensor of the commutation structure and the temperature detection mechanism, respectively.

12. A heat dissipation method, characterized in that, The method for the heat dissipation system according to any one of claims 1-11 comprises: Obtain the first temperature T1 of the coolant at the first opening of the heat exchange plate; Obtain the second temperature T2 of the coolant at the second opening of the heat exchange plate; The switching structure is controlled to switch between the first operating state and the second operating state based on the first temperature and the second temperature.

13. The heat dissipation method according to claim 12, characterized in that, Controlling the switching structure to switch between a first operating state and a second operating state based on the first temperature T1 and the second temperature T2 includes: When the temperature difference between the first temperature T1 and the second temperature T2 When T is greater than the preset temperature K1, the switching structure is controlled to switch between the first working state and the second working state.

14. The heat dissipation method according to claim 13, characterized in that, Controlling the switching of the commutation structure to switch between the first operating state and the second operating state according to the first temperature T1 and the second temperature T2 further includes: The difference between the preset temperature K1, the hysteresis temperature K2, and the temperature is calculated as follows: In the T comparison, the preset temperature K1 is greater than the hysteresis temperature K2. when When T > K1 + K2, the commutation structure is controlled to switch between the first working state and the second working state. When K1+K2≥ When T > K1, the commutation structure is controlled to maintain its original working state.

15. The heat dissipation method according to claim 13, characterized in that, When the temperature difference between the first temperature T1 and the second temperature T2 When T is greater than the preset temperature K1, controlling the switching structure to switch between the first and second working states also includes: When the reversing structure switches from the first working state to the second working state or from the second working state to the first working state... When the temperature difference When T≤K1-K2, it is confirmed that the commutation structure meets the conditions for switching between the first and second working states again; when When T > K1 + K2, the commutation structure is controlled to switch between the first working state and the second working state, wherein K2 is the hysteresis temperature and is less than the preset temperature K1.

16. The heat dissipation method according to claim 15, characterized in that, When the temperature difference When T≤K1-K2, confirming that the reversing structure meets the condition of switching the first working state and the second working state again also includes: the interval time H1 between the reversing structure switching the first working state and the second working state again satisfies: H1≥ preset time.

17. The heat dissipation method according to claim 13, characterized in that, The method further includes: When either the first temperature value T1 or the second temperature value T2 is higher than the maximum temperature threshold K3, the switching structure is controlled to switch between the first working state and the second working state, and an alarm command is issued.

18. A power distribution box, characterized in that, Includes the heat dissipation system described in any one of claims 1-11.

19. The distribution box according to claim 18, characterized in that, The distribution box also includes multiple electrical components, including at least one of relays, fuses, busbars, and shunts, and the heat dissipation system is used to cool at least one of the electrical components.

20. The distribution box according to claim 19, characterized in that, The first opening and the second opening are located at the edge of the distribution box.

21. A battery pack, characterized in that, It includes a cooling circuit and a power distribution box as described in any one of claims 18 to 20, wherein the inlet and return lines of the cooling circuit are connected to the heat exchange plate through a reversing structure within the power distribution box.

22. An electrical appliance, characterized in that, Includes the battery pack as described in claim 21.

Images