Charging pile, electric vehicle and over-temperature protection method of thermal management system

Abstract

The invention relates to an over-temperature protection method for a charging pile, an electric automobile and a thermal management system, which is characterized in that the temperature value of a direct-current bus and the temperature difference of the thermal management system are monitored at a charging pile end and an electric automobile end respectively, and the temperature difference / temperature value between the charging pile end and the electric automobile end can be judged at the two ends; when any end exceeds the preset stable numerical value range or reaches the preset protection value for reducing the charging current, the charging current is adjusted, the current charging state can be known at any time, performance reduction caused by loss is avoided, the charging process is more stable, and the charging safety is improved.

Description

Technical Field

[0001] The invention relates to an over-temperature protection method for a charging pile, an electric vehicle and a thermal management system, and belongs to the technical field of electric vehicle charging. Background Art

[0002] At present, the high-power plug-in charging technology for electric vehicles is in a rapid development stage. The main technical route is to improve the current-carrying capacity of the charging connection device. The implementation scheme adopted is to reduce the temperature rise of the charging connection device under continuous current carrying through liquid cooling. The over-temperature protection method of the charging connection device with traditional air cooling mainly adopts the method of comparing the current collected value with the preset protection value, and according to the current temperature collection value and the factory calibration strategy, the charging current is adjusted in a large / step manner or charging is directly stopped to achieve the purpose of over-temperature protection. This method can avoid the problem of over-temperature ablation or over-temperature fire to a certain extent in the initial use of the charging connection device. However, as the charging connection device is continuously plugged in and out, the preset protection value calibrated at the factory cannot be adaptively adjusted according to the wear status of the components, especially in megawatt-level supercharging systems. The charging connection device is charged with a large current for a long time, which is prone to rapid over-temperature problems. Due to the failure of protection, the charging connection device is exposed to safety risks such as over-temperature ablation or even fire.

[0003] The patent document with publication number CN104269823A discloses an over-temperature protection method and device, in which the over-temperature protection method uses the real-time temperature change rate of the temperature sensor to compare with the preset protection value to achieve the purpose of over-temperature protection of the motor system. This method has certain advantages over the method of comparing the actual sampling value with the preset protection value, but it still cannot adaptively solve the problem of changes in protection values ​​caused by the continuous wear and tear of electric vehicle parts. The patent document with publication number CN117246162A discloses an on-board charging connection device, an electric vehicle, a liquid cooling device, and a charging pile. It proposes that the pile-end thermal management system uniformly provides liquid cooling circulation heat dissipation capability for the charging connection device and the power battery. However, the liquid cooling heat dissipation of the components of the electric vehicle and the charging pile has problems such as inconsistency in the cold source medium, flow rate, water pump and cooling fan power, resulting in the liquid cooling circulation heat dissipation capability uniformly provided by the thermal management system being unable to meet the different needs of the electric vehicle and the charging pile, resulting in reduced reliability and safety. Summary of the invention

[0004] The purpose of the present invention is to provide an over-temperature protection method for a charging pile, an electric vehicle and a thermal management system, so as to solve the problem that the protection value changes as the electric vehicle parts are continuously worn out and cannot be adaptively solved, and to realize real-time monitoring of the temperature data of the charging pile and the electric vehicle, so as to understand the current charging status of the charging pile and the electric vehicle, so as to perform over-temperature protection by timely reducing the charging current.

[0005] To achieve the above object, on the one hand, the present invention proposes an over-temperature protection method for a charging pile thermal management system, comprising: Monitor the DC bus temperature value of the charging gun and the temperature difference between the inlet and outlet liquid of the pile-end thermal management system; also obtain the inlet and outlet liquid temperature data of the electric vehicle thermal management system sent by the electric vehicle, and determine whether the inlet and outlet liquid temperature difference of the electric vehicle thermal management system is within the preset stable data range of the inlet and outlet liquid temperature difference of the electric vehicle thermal management system; if any of the inlet and outlet liquid temperature difference of the pile-end thermal management system and the inlet and outlet liquid temperature difference of the electric vehicle thermal management system exceeds the corresponding preset stable data range, or the DC bus temperature value reaches the preset protection value for reducing the charging current, reduce the charging current according to the preset strategy.

[0006] Furthermore, in the over-temperature protection method of the charging pile thermal management system, the temperature difference between the inlet and outlet liquids of the pile end thermal management system is obtained through the following steps: Monitor the temperature values ​​of the liquid inlet sampling point and the liquid outlet sampling point of the pile end thermal management system; According to the temperature value of the inlet and outlet sampling points, the inlet and outlet temperature difference of the pile end thermal management system is obtained.

[0007] Furthermore, the over-temperature protection method of the charging pile thermal management system further includes: If any one of the temperature value of the liquid inlet sampling point and the temperature value of the liquid outlet sampling point of the pile end thermal management system reaches a preset protection value for reducing the charging current, the charging current is reduced according to a preset strategy.

[0008] Furthermore, the over-temperature protection method of the charging pile thermal management system further includes: Preset current protection value for stopping charging; When the temperature value of the DC busbar of the monitoring charging gun and any of the temperature values ​​of the inlet sampling point and the outlet sampling point of the pile end thermal management system reach the current protection value for stopping charging, the charging pile stops charging the electric vehicle.

[0009] On the other hand, the present invention provides an over-temperature protection method for a thermal management system of an electric vehicle, comprising: Monitor the DC bus temperature value of the electric vehicle and the inlet and outlet liquid temperature difference of the thermal management system at the electric vehicle end; also obtain the inlet and outlet liquid temperature data of the pile thermal management system sent by the charging pile, and determine whether the inlet and outlet liquid temperature difference of the pile thermal management system is within the preset stable data range of the inlet and outlet liquid temperature difference of the pile thermal management system; if any of the inlet and outlet liquid temperature difference of the thermal management system at the electric vehicle end and the inlet and outlet liquid temperature difference of the pile thermal management system exceeds the corresponding preset stable data range, or the DC bus temperature value reaches the preset protection value for reducing the charging current, reduce the charging current according to the preset strategy.

[0010] Furthermore, in the over-temperature protection method of the electric vehicle thermal management system, the temperature difference between the inlet and outlet liquids of the electric vehicle thermal management system is obtained through the following steps: Monitor the temperature values ​​of the liquid inlet sampling point and the liquid outlet sampling point of the thermal management system at the electric vehicle end; According to the temperature value of the inlet and outlet sampling points, the inlet and outlet temperature difference of the thermal management system at the electric vehicle end is obtained.

[0011] Furthermore, the over-temperature protection method of the electric vehicle thermal management system further includes: If any one of the temperature values ​​of the liquid inlet sampling point and the liquid outlet sampling point of the thermal management system at the electric vehicle end reaches a preset protection value for reducing the charging current, the charging current is reduced according to a preset strategy.

[0012] Furthermore, the over-temperature protection method of the electric vehicle thermal management system further includes: Preset current protection value for stopping charging; When the temperature value of the DC bus of the electric vehicle and any of the temperature values ​​of the inlet sampling point and the outlet sampling point of the thermal management system at the electric vehicle end reaches the current protection value for stopping charging, the charging current received by the charging pile is stopped.

[0013] On the other hand, the present invention further provides a charging pile, comprising a controller, wherein the controller executes the over-temperature protection method of the charging pile thermal management system as described above.

[0014] On the other hand, the present invention further provides an electric vehicle, comprising a controller, wherein the controller executes the over-temperature protection method of the electric vehicle thermal management system as described above.

[0015] The beneficial effects of the present invention are as follows: at the charging pile end: monitoring the DC bus temperature value of the charging gun and the temperature difference between the inlet and outlet liquids of the pile end thermal management system; also obtaining the inlet and outlet liquid temperature data of the electric vehicle thermal management system sent by the electric vehicle, and judging whether the inlet and outlet liquid temperature difference of the electric vehicle thermal management system is within the preset stable data range of the inlet and outlet liquid temperature difference of the electric vehicle thermal management system; if any one of the inlet and outlet liquid temperature difference of the pile end thermal management system and the inlet and outlet liquid temperature difference of the electric vehicle thermal management system exceeds the corresponding preset stable data range, or the DC bus temperature value reaches the preset protection value for reducing the charging current, the charging current is reduced according to the preset strategy. At the electric vehicle end: monitor the electric vehicle DC bus temperature value and the inlet and outlet liquid temperature difference of the electric vehicle end thermal management system; also obtain the pile thermal management system inlet and outlet liquid temperature data sent by the charging pile, and determine whether the pile thermal management system inlet and outlet liquid temperature difference is within the preset stable data range of the pile thermal management system inlet and outlet liquid temperature difference; if any of the electric vehicle end thermal management system inlet and outlet liquid temperature difference and the pile thermal management system inlet and outlet liquid temperature difference exceeds the corresponding preset stable data range, or the DC bus temperature value reaches the preset protection value for reducing the charging current, reduce the charging current according to the preset strategy, establish temperature data sharing between the electric vehicle end and the charging pile end, and combine with real-time monitoring of the temperature data at both ends to monitor the loss of the electric vehicle or the loss of the charging pile, so as to achieve over-temperature protection of the thermal management system at both the electric vehicle end and the charging pile end, avoid the overall charging being unable to adjust due to a fault on one side, and ensure a safe and stable charging project. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the interaction process between the charging pile end and the electric vehicle end of the over-temperature protection method of the thermal management system of one aspect of the present application; Figure 2 It is a comparison curve of the temperature sampling points and the inlet and outlet temperature difference data of an over-temperature protection method of a charging pile thermal management system in an aspect of the present application under normal conditions in an actual application scenario; Figure 3 It is a comparison curve of data of temperature sampling points and inlet and outlet liquid temperature difference after the protection strategy of an over-temperature protection method of a charging pile thermal management system in an actual application scenario after adjustment of the protection strategy in one aspect of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] The idea of ​​the invention is to monitor the DC bus temperature value and the temperature difference of the thermal management system at the charging pile end and the electric vehicle end respectively, and to judge the temperature difference / temperature value between itself and the other party at both ends. When the temperature at either end exceeds the preset stable value range or reaches the preset protection value for reducing the charging current, the charging current is adjusted. This not only allows the current charging status to be understood at any time and performance degradation due to loss to be avoided, but also makes the charging process more stable and improves charging safety.

[0019] Charging pile end method embodiment 1: In one aspect of the present invention, an over-temperature protection method for a charging pile thermal management system is proposed, wherein the method comprises steps S11 to S13, specifically: Step S11, monitor the temperature value of the DC busbar of the charging gun and the temperature difference between the inlet and outlet liquids of the pile-end thermal management system; here, the DC busbar of the charging gun refers to the charging connection device DC+ / DC- at the charging gun end; at the same time, the temperature difference between the inlet and outlet liquids of the pile-end thermal management system will be calculated by monitoring the temperature value of the inlet sampling point and the outlet sampling point of the pile-end thermal management system, so as to obtain temperature data in real time and understand the damage or status information of electric vehicles and charging pile components, which is a key step to avoid temperature value changes caused by the loss of non-adaptive parts.

[0020] Step S12, obtaining the inlet and outlet liquid temperature data of the electric vehicle thermal management system sent by the electric vehicle, and judging whether the inlet and outlet liquid temperature difference of the electric vehicle thermal management system is within the preset stable data range of the inlet and outlet liquid temperature difference of the electric vehicle thermal management system; here, the inlet and outlet liquid temperature data may include the temperature value of the inlet liquid sampling point and the temperature value of the outlet liquid sampling point of the electric vehicle thermal management system; it may also include the inlet and outlet liquid temperature difference of the electric vehicle thermal management system, etc., wherein, when the inlet and outlet liquid temperature data are the temperature value of the inlet liquid sampling point and the temperature value of the outlet liquid sampling point, the inlet and outlet liquid temperature difference will also be calculated for subsequent judgment of whether it exceeds the preset stable data range. In the preferred embodiment of the present application, the preferred inlet and outlet liquid temperature data is the inlet and outlet liquid temperature difference of the electric vehicle thermal management system; the preset stable data range refers to the preset range for judging whether the inlet and outlet liquid temperature difference of the thermal management system is in normal operation or stable operation, which can be set according to different electric vehicle needs, or different charging pile needs, or different user needs, etc.

[0021] According to the data monitored in step S11 and the data received in step S12, step S13 is executed. If any of the temperature difference between the inlet and outlet liquid of the pile end thermal management system and the temperature difference between the inlet and outlet liquid of the electric vehicle thermal management system exceeds the corresponding preset stable data range, or the DC bus temperature value reaches the preset protection value for reducing the charging current, the charging current is reduced according to the preset strategy; it should be noted that the protection value for reducing the charging current refers to the current threshold that triggers the reduction of the charging current; the preset strategy includes but is not limited to adjusting the charging current in a step-by-step manner, or adjusting the charging current in a large range, wherein the charging current can be adjusted in a step-by-step manner by a preset reduction threshold or a preset charging level, for example: when the preset reduction threshold is 5mA, the charging current is adjusted in steps of 5mA each; or, when the preset charging levels are level I and level II, and the charging current of level I is larger than that of level II, the charging current is adjusted in steps from level I to level II.

[0022] In a preferred embodiment of the present invention, the charging pile M and the electric vehicle m enter a charging process; the temperature value T of the DC+ / DC- of the charging pile M is monitored. m1 , the temperature value T of the liquid inlet sampling point of the pile end thermal management system m2 and the temperature value T of the liquid sampling point m3 , and calculate the inlet and outlet temperature difference T of the pile end thermal management system m4 Receive the inlet and outlet temperature difference T of the electric vehicle thermal management system sent by the electric vehicle m m5 and its corresponding preset stable data range.

[0023] According to the temperature difference T between the inlet and outlet liquids of the thermal management system at the charging pile M m4 The temperature difference T between the inlet and outlet fluids of the electric vehicle thermal management system of the electric vehicle m m5 , determine the temperature difference T between the inlet and outlet liquids of the pile end thermal management system m4 Whether it exceeds the preset stable data range corresponding to the pile end, the temperature difference T between the inlet and outlet liquid of the electric vehicle thermal management system m5 Whether it exceeds the preset stable data range corresponding to the electric vehicle end.

[0024] Or, according to the temperature value T of DC+ / DC- of charging pile M m1 , determine whether the temperature value of DC+ / DC- reaches the preset protection value for reducing the charging current.

[0025] When the temperature difference between the inlet and outlet liquid of the pile end thermal management system is T m4 and the temperature difference T between the inlet and outlet liquids of the electric vehicle thermal management system m5 Any of them exceeds the corresponding preset stable data range, or the DC+ / DC- temperature value T of the direct charging pile M m1When the value reaches the preset protection value for reducing the charging current, the charging current is adjusted according to the reduced threshold.

[0026] Charging pile end method embodiment 2: Following the above embodiment of the present invention, in another aspect, a method for over-temperature protection of a charging pile thermal management system is proposed, further comprising: If any one of the temperature values ​​at the inlet sampling point and the outlet sampling point of the pile-end thermal management system reaches a preset protection value for reducing the charging current, the charging current is reduced according to the preset strategy. Here, whether it is the judgment of the temperature value at the inlet sampling point and the temperature value at the outlet sampling point, or the judgment of the inlet and outlet temperature difference, it can trigger the operation of reducing the charging current. The two judgment methods do not conflict, and in actual application scenarios, the two judgment methods can also be used successively or simultaneously in superposition, that is, while judging whether any one of the temperature value at the inlet sampling point and the temperature value at the outlet sampling point reaches the preset protection value for reducing the charging current, it is judged that any one of the inlet and outlet temperature difference of the pile-end thermal management system and the inlet and outlet temperature difference of the electric vehicle thermal management system exceeds the corresponding preset stable data range. If the two judgment conditions occur successively, the charging current is adjusted twice successively; if the two judgment conditions occur simultaneously, the charging current is adjusted significantly.

[0027] In a preferred embodiment of the present application, the temperature difference T between the inlet and outlet liquids of the pile end thermal management system is determined. m4 Whether it exceeds the preset stable data range corresponding to the pile end, the temperature difference T between the inlet and outlet liquid of the electric vehicle thermal management system m5 Whether it exceeds the preset stable data range corresponding to the electric vehicle end. Or, according to the temperature value T of the DC+ / DC- of the charging pile M m1 , determine the temperature value T of DC+ / DC- m1 Whether the preset protection value for reducing charging current has been reached.

[0028] At the same time, determine the temperature value T of the liquid inlet sampling point m6 and the temperature value T of the liquid sampling point m7 Whether the preset protection value of reducing charging current is reached. Preferably, the temperature difference Tm4 of the inlet and outlet liquid of the pile end thermal management system exceeds the preset stable data range corresponding to the pile end, and then the temperature value Tm4 of the inlet liquid sampling point m6 When the preset protection value for reducing the charging current is reached, the charging pile M adjusts the charging current of the electric vehicle m twice in succession, thereby increasing the applicable range of the charging current adjustment and having the characteristics of high stability and high safety.

[0029] Charging pile end method embodiment 3: Following the above embodiment of the present invention, in another aspect of the present invention, an over-temperature protection method of a charging pile thermal management system is also proposed, which further includes: A current protection value for stopping charging is preset; here, the current protection value for stopping charging can be set according to different electric vehicle requirements, or different charging pile requirements, or different user requirements, etc.

[0030] When the temperature value of the DC busbar of the monitoring charging gun and any of the temperature values ​​of the inlet sampling point and the outlet sampling point of the pile-end thermal management system reach the current protection value for stopping charging, the charging pile will stop charging the electric vehicle, providing safer charging protection for the charging pile and the electric vehicle.

[0031] In a preferred embodiment of the present application, the current protection value for stopping charging between the charging pile M and the electric vehicle m is set to Imax; when the temperature value T of the DC+ / DC- of the charging gun M is monitored m1 And the temperature value T of the liquid inlet sampling point of the pile end thermal management system m6 and the temperature value T of the liquid sampling point m7 When any temperature value reaches the current protection value Imax for stopping charging, the charging current of the charging pile M to the electric vehicle m is stopped.

[0032] Two-end interactive (charging pile end and electric vehicle end) method embodiment 1: like Figure 1 As shown, it is a schematic diagram of the interactive process between the charging pile end and the electric vehicle end of the over-temperature protection method of the thermal management system of one aspect of the present application, wherein, first, after the electric vehicle and the charging pile enter the charging process, at the charging pile end: the charging connection device DC+ / DC-, the temperature value of the inlet sampling point / the temperature value of the outlet sampling point of the pile end thermal management system are detected in real time, and the inlet and outlet liquid temperature difference of the pile end thermal management system is calculated, and the real-time inlet and outlet liquid temperature difference and the inlet and outlet liquid temperature difference preset stable data range are synchronized to the electric vehicle end. Similarly, at the electric vehicle end: the charging connection device DC+ / DC-, the temperature value of the inlet sampling point / the temperature value of the outlet sampling point of the electric vehicle end thermal management system are detected in real time, and the inlet and outlet liquid temperature difference of the electric vehicle end thermal management system is calculated, and the real-time inlet and outlet liquid temperature difference and the inlet and outlet liquid temperature difference preset stable data range are synchronized to the charging pile end.

[0033] Secondly, the following steps are performed at both the charging pile end and the electric vehicle end to directly execute the preset charging current reduction protection strategy. Specifically: (1) When the charging pile end or the electric vehicle end detects that the temperature difference between the inlet and outlet liquids of any thermal management system in the vehicle thermal management system or the pile thermal management system exceeds the corresponding stable data range, the charging current is directly reduced according to the preset strategy; (2) When the charging pile end or the electric vehicle end detects that the temperature values ​​of the sampling points such as the DC+ / DC- of the respective charging connection devices, the inlet sampling point / outlet sampling point of the thermal management system, etc. reach the preset protection value for reducing the charging current, the charging current is directly reduced according to the preset strategy; (3) The two protection strategies for reducing the charging current in (1) and (2) above do not conflict and can overlap successively or simultaneously. When (1) and (2) occur successively, the charging current is adjusted twice successively. When (1) and (2) occur simultaneously, the adjustment range of the charging current is larger; (4) When the charging pile end or the electric vehicle end detects that the temperature difference between the inlet and outlet liquids of any thermal management system in the vehicle thermal management system or the pile thermal management system exceeds the stable data range, measures such as increasing the working power of the thermal management system water pump and the speed of the cooling fan can be taken simultaneously or successively to improve the cooling performance, which can be used as one of the judgment conditions for the thermal management system to maintain stable cooling performance.

[0034] Finally, when the charging pile or electric vehicle detects that the temperature value of any sampling point such as the DC+ / DC- of the respective charging connection device, the inlet / outlet of the thermal management system, etc. reaches the preset protection value for stopping charging, the charging pile will directly stop charging the electric vehicle.

[0035] like Figure 2 and Figure 3 As shown, respectively, are the comparison curves of each temperature sampling point and the inlet and outlet temperature difference data in the normal state in the actual application scenario of an over-temperature protection method of a charging pile thermal management system in one aspect of the present application, and the comparison curves of each temperature sampling point and the inlet and outlet temperature difference data after the protection strategy is adjusted, wherein, Figure 2 Calibration data for the stable data range of the inlet and outlet temperature difference of the electric vehicle thermal management system or the charging pile thermal management system; Figure 3 To protect the data after the policy adjustment.

[0036] In summary, the present invention avoids the problem of not providing timely protection when the inlet and outlet liquid temperature difference of a charging pile or electric vehicle thermal management system exceeds a stable data range due to control system abnormalities; it can solve the problem of some existing electric vehicles or charging piles in the market that can synchronize the inlet and outlet liquid temperature difference and the stable data range normally through simple measures, but cannot execute protection strategies in a short period of time.

[0037] At the same time, on the other hand, the present application also provides an over-temperature protection method for an electric vehicle thermal management system, which is a consistent electric vehicle end corresponding to the over-temperature protection method of the charging pile thermal management system, thereby realizing over-temperature protection of the thermal management system at the electric vehicle end, and achieving protection by reducing the charging current at the electric vehicle end. Here, the embodiment of the over-temperature protection method of the electric vehicle thermal management system please refer to the embodiment of the over-temperature protection method of the charging pile thermal management system mentioned above, which will not be repeated here.

[0038] In addition, the present application also provides a charging pile, which includes a controller, and the controller executes the over-temperature protection method of the above-mentioned charging pile thermal management system; and an electric vehicle, which includes a controller, and the controller executes the over-temperature protection method of the above-mentioned electric vehicle thermal management system. Here, the embodiment of the charging pile, please refer to the embodiment of the over-temperature protection method of the above-mentioned charging pile thermal management system; the embodiment of the electric vehicle, please refer to the embodiment of the over-temperature protection method of the above-mentioned electric vehicle thermal management system, which will not be repeated here.

Claims

1. An over-temperature protection method for a charging pile thermal management system, characterized in that: include: Monitor the DC bus temperature value of the charging gun and the temperature difference between the inlet and outlet liquid of the pile-end thermal management system; also obtain the inlet and outlet liquid temperature data of the electric vehicle thermal management system sent by the electric vehicle, and determine whether the inlet and outlet liquid temperature difference of the electric vehicle thermal management system is within the preset stable data range of the inlet and outlet liquid temperature difference of the electric vehicle thermal management system; if any of the inlet and outlet liquid temperature difference of the pile-end thermal management system and the inlet and outlet liquid temperature difference of the electric vehicle thermal management system exceeds the corresponding preset stable data range, or the DC bus temperature value reaches the preset protection value for reducing the charging current, reduce the charging current according to the preset strategy.

2. The over-temperature protection method of the charging pile thermal management system according to claim 1, characterized in that: The temperature difference between the inlet and outlet liquids of the pile end thermal management system is obtained through the following steps: Monitor the temperature values ​​of the liquid inlet sampling point and the liquid outlet sampling point of the pile end thermal management system; According to the temperature value of the inlet and outlet sampling points, the inlet and outlet temperature difference of the pile end thermal management system is obtained.

3. The over-temperature protection method of the charging pile thermal management system according to claim 2, characterized in that: Also includes: If any one of the temperature value of the liquid inlet sampling point and the temperature value of the liquid outlet sampling point of the pile end thermal management system reaches a preset protection value for reducing the charging current, the charging current is reduced according to a preset strategy.

4. The over-temperature protection method of the charging pile thermal management system according to claim 2 or 3, characterized in that: Also includes: Preset current protection value for stopping charging; When the temperature value of the DC busbar of the monitoring charging gun and any of the temperature values ​​of the inlet sampling point and the outlet sampling point of the pile end thermal management system reach the current protection value for stopping charging, the charging pile stops charging the electric vehicle.

5. An over-temperature protection method for a thermal management system of an electric vehicle, characterized in that: include: Monitor the DC bus temperature value of the electric vehicle and the inlet and outlet liquid temperature difference of the thermal management system at the electric vehicle end; also obtain the inlet and outlet liquid temperature data of the pile thermal management system sent by the charging pile, and determine whether the inlet and outlet liquid temperature difference of the pile thermal management system is within the preset stable data range of the inlet and outlet liquid temperature difference of the pile thermal management system; if any of the inlet and outlet liquid temperature difference of the thermal management system at the electric vehicle end and the inlet and outlet liquid temperature difference of the pile thermal management system exceeds the corresponding preset stable data range, or the DC bus temperature value reaches the preset protection value for reducing the charging current, reduce the charging current according to the preset strategy.

6. The over-temperature protection method of the electric vehicle thermal management system according to claim 5, characterized in that: The temperature difference between the inlet and outlet liquids of the thermal management system at the electric vehicle end is obtained through the following steps: Monitor the temperature values ​​of the liquid inlet sampling point and the liquid outlet sampling point of the thermal management system at the electric vehicle end; According to the temperature value of the inlet and outlet sampling points, the inlet and outlet temperature difference of the thermal management system at the electric vehicle end is obtained.

7. The over-temperature protection method of the electric vehicle thermal management system according to claim 6, characterized in that: Also includes: If any one of the temperature values ​​of the liquid inlet sampling point and the liquid outlet sampling point of the thermal management system at the electric vehicle end reaches a preset protection value for reducing the charging current, the charging current is reduced according to a preset strategy.

8. The over-temperature protection method of the electric vehicle thermal management system according to claim 6 or 7, characterized in that: Also includes: Preset current protection value for stopping charging; When the temperature value of the DC bus of the electric vehicle and any of the temperature values ​​of the inlet sampling point and the outlet sampling point of the thermal management system at the electric vehicle end reaches the current protection value for stopping charging, the charging current received by the charging pile is stopped.

9. A charging pile, characterized in that: It includes a controller, which executes the over-temperature protection method of the charging pile thermal management system as described in any one of claims 1-4.

10. An electric vehicle, characterized in that: It includes a controller, which executes the over-temperature protection method of the electric vehicle thermal management system as described in any one of claims 5-8.

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