Thermal management system, control method and device of thermal management system and electric mine car

Abstract

The invention relates to the technical field of electric mine cars, in particular to a thermal management system, a control method and device of the thermal management system and an electric mine car. The thermal management system comprises a first compressor cooling loop, a second compressor cooling loop, a radiator cooling loop and a heating loop; the first compressor cooling loop is connected with a cab refrigeration pipeline and a power battery temperature control loop in a cab and is used for outputting a cooling medium to the cab refrigeration pipeline and / or the power battery temperature control loop; the second compressor cooling loop is connected with the power battery temperature control loop and is used for outputting a cooling medium to the power battery temperature control loop; the radiator cooling loop is connected with the power battery temperature control loop, and the radiator cooling loop is used for carrying out air cooling on the power battery temperature control loop; and the heating loop is connected with the power battery temperature control loop and is used for heating the power battery temperature control loop. Accurate and efficient temperature control over the power battery and the cockpit of the electric mine car is achieved.

Description

Technical Field

[0001] This invention relates to the field of electric mining truck technology, specifically to a thermal management system, a control method and device for the thermal management system, and an electric mining truck. Background Technology

[0002] Currently, the mainstream thermal management system for new energy vehicles in construction machinery, especially electric mining trucks, adopts an independent cab air conditioning system and a power battery cooling circuit. This separate thermal management architecture has the following drawbacks: the independent operation of the cab and battery cooling system leads to repeated energy consumption; the thermal management system frequently starts and stops the compressor in high-temperature mining environments; and the thermal management system lacks an intelligent thermal coupling control strategy for the cab and power battery.

[0003] Therefore, a precise and efficient thermal management system for controlling the temperature of the power battery and cab of an electric mining truck, as well as a control method for the thermal management system, urgently needs to be studied. Summary of the Invention

[0004] This invention provides a thermal management system, a control method and device for the thermal management system, and an electric mining truck. The aim is to achieve precise and efficient temperature control of the power battery and driver's cab of the electric mining truck by integrating a first compressor cooling circuit, a second compressor cooling circuit, a radiator cooling circuit and a heating circuit into the thermal management system, so as to ensure the safety and long life of the power battery and improve the range and energy efficiency of the whole vehicle.

[0005] In a first aspect, embodiments of this application provide a thermal management system applied to an electric mining truck, comprising: The first compressor cooling circuit is connected to both the cab cooling pipe and the power battery temperature control circuit in the cab. When the ambient temperature of the electric mining truck is higher than the preset ambient temperature, the first compressor cooling circuit is used to output cooling medium to the cab cooling pipe and / or the power battery temperature control circuit to cool the cab and / or the power battery. The second compressor cooling circuit is connected to the power battery temperature control circuit. When the ambient temperature of the electric mining truck is higher than the preset ambient temperature, the second compressor cooling circuit is used to output cooling medium to the power battery temperature control circuit to cool the power battery. The radiator cooling circuit is connected to the power battery temperature control circuit. When the ambient temperature of the electric mining truck is lower than the preset ambient temperature, the radiator cooling circuit is used to air cool the power battery temperature control circuit. The heating circuit is connected to the power battery temperature control circuit and is used to heat the power battery temperature control circuit; the heating circuit is also used to provide heating air to the cab.

[0006] Optionally, the first compressor cooling circuit includes a first temperature and pressure sensor, a first compressor, a first condenser, a first pressure sensor, an electronic expansion valve, a first plate heat exchanger, and a second temperature and pressure sensor connected in sequence to form a circuit; the first condenser is equipped with a first electronic fan; one end of the cab cooling pipe is connected to a pipe located between the electronic expansion valve and the first pressure sensor; the other end of the cab cooling pipe is connected to a pipe located between the first temperature and pressure sensor and the second temperature and pressure sensor; the first plate heat exchanger is also connected to the power battery temperature control circuit; The second compressor cooling circuit includes a second compressor, a second condenser, a second pressure sensor, a thermal valve, a second plate heat exchanger, and a third temperature and pressure sensor connected in sequence to form a circuit; the second condenser is equipped with a second electric fan, and the second plate heat exchanger is also connected to the first plate heat exchanger and the power battery temperature control circuit through pipelines. The radiator cooling circuit includes an electric drive motor, a first bubble separator, a radiator, a first temperature sensor, a first water pump, and a first four-way valve connected in sequence to form a circuit. A third electric fan is provided on the radiator. The first four-way valve is also connected to the power battery temperature control circuit. The heating circuit includes a second bubble separator, a second water pump, a PTC heater, an air conditioning heating system, and a second four-way valve connected in sequence to form a circuit. The second four-way valve is also connected to the power battery temperature control circuit.

[0007] Secondly, embodiments of this application provide a control method for a thermal management system, characterized in that the method is applied to the thermal management system described above, and the method includes: When the cab does not require cooling and the ambient temperature of the electric mining truck is higher than the preset ambient temperature, in response to the cooling command sent by the first controller of the power battery, the current temperature information of the power battery is classified according to the first classification strategy, so as to control the first compressor cooling circuit and / or the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition according to the classification result. When the cab needs cooling, in response to the cooling command sent by the second controller in the cab, the first compressor cooling circuit is controlled to output cooling medium to cool the cab cooling pipes; When the cab needs to be cooled and the ambient temperature of the electric mining truck is higher than the preset ambient temperature, in response to the cooling command sent by the first controller of the power battery, the current temperature information of the power battery is classified according to the second classification strategy, so as to control the second compressor cooling circuit to cool the power battery according to the classification result, or control the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition. When the ambient temperature of the electric mining truck is lower than the preset ambient temperature, in response to the heating command sent by the first controller of the power battery, the heating circuit is controlled to heat the power battery temperature control circuit; and in response to the cooling command sent by the first controller of the power battery, the radiator cooling circuit is controlled to air cool the power battery temperature control circuit, so that the power battery is cooled to the point where it meets the cooling exit condition.

[0008] Optionally, the current temperature information of the power battery includes the highest cell temperature of the power battery in the non-charging state and the battery inlet temperature; the first classification strategy includes at least one of the first classification rule, the second classification rule and the third classification rule; The first classification rule includes: if the highest cell temperature of the power battery in the non-charging state is between the first preset temperature and the second preset temperature, and the battery inlet temperature is not higher than the third preset temperature, then the cooling classification of the power battery is determined to be level one; wherein, the first preset temperature is higher than the second preset temperature, and the third preset temperature is lower than the second preset temperature. The second classification rule includes: if the highest cell temperature of the power battery in the non-charging state is not lower than the second preset temperature, and the battery inlet temperature is higher than the third preset temperature, then the cooling classification of the power battery is determined to be level two. The third classification rule includes: if the highest cell temperature of the power battery in the non-charging state is not lower than the fourth preset temperature, then the cooling classification of the power battery is determined to be level three; the fourth preset temperature is higher than the first preset temperature. The current temperature information of the power battery is used to perform cooling classification based on the first classification strategy, and the first compressor cooling circuit and / or the second compressor cooling circuit are controlled to cool the power battery according to the classification results, including: If the cooling level of the power battery is determined to be Level 1, then the cooling medium output by the cooling circuit of the first compressor is controlled to cool the power battery. If the cooling level of the power battery is determined to be two levels, then the cooling medium output by the cooling circuit of the second compressor is controlled to cool the power battery. If the cooling level of the power battery is determined to be three levels, then the cooling medium output by the cooling circuits of the first and second compressors simultaneously will be used to cool the power battery.

[0009] Optionally, if the cooling stage of the power battery is determined to be Level 1, after the cooling medium output from the cooling circuit of the first compressor cools the power battery, the method further includes: After the first compressor cooling circuit cools the power battery for a first preset time, if the power battery fails to cool to the point where it exits cooling, the cooling medium output by the second compressor cooling circuit is controlled so that the first compressor cooling circuit and the second compressor cooling circuit simultaneously cool the power battery.

[0010] Optionally, if the cooling stage of the power battery is determined to be two levels, after the cooling medium output from the cooling circuit of the second compressor cools the power battery, the method further includes: After the second compressor cooling circuit cools the power battery for a second preset time, if the power battery fails to cool to the point where it exits cooling, the cooling medium output by the first compressor cooling circuit is controlled so that the first compressor cooling circuit and the second compressor cooling circuit cool the power battery simultaneously.

[0011] Optionally, the second classification strategy includes at least one of the fourth classification rule, the fifth classification rule, and the sixth classification rule; The fourth classification rule includes: if the battery inlet temperature is not lower than the fifth preset temperature, and the highest cell temperature of the power battery in the non-charging state is between the second preset temperature and the fourth preset temperature, then the cooling classification of the power battery is determined to be level four; wherein, the fifth preset temperature is the temperature between the second preset temperature and the third preset temperature. The fifth classification rule includes: if the battery inlet temperature is lower than the fifth preset temperature, and the highest cell temperature of the power battery in the non-charging state is between the second preset temperature and the fourth preset temperature, then the cooling classification of the power battery is determined to be level five. The sixth classification rule includes: if the highest cell temperature is not lower than the fourth preset temperature, then the cooling classification of the power battery is determined to be level six; The cooling system is graded according to the current temperature information of the power battery based on the second grading strategy. Based on the grading results, the second compressor cooling circuit is controlled to cool the power battery, or the first compressor cooling circuit and the second compressor cooling circuit are controlled to cool the power battery. This includes: If the cooling level of the power battery is determined to be four levels, then the cooling medium output by the cooling circuit of the second compressor is controlled to cool the power battery. If the cooling level of the power battery is determined to be five levels, then the cooling medium output by the cooling circuit of the second compressor is controlled to cool the power battery. If the cooling level of the power battery is determined to be six levels, then the cooling medium output by the cooling circuits of the first and second compressors simultaneously will be used to cool the power battery.

[0012] Optionally, if the cooling level of the power battery is determined to be five levels, after the cooling medium output from the cooling circuit of the second compressor cools the power battery, the following steps are also included: After the second compressor cooling circuit cools the power battery for a third preset time, if the power battery fails to cool to the point where it exits cooling, the cooling medium output by the first compressor cooling circuit is controlled so that the first compressor cooling circuit and the second compressor cooling circuit simultaneously cool the power battery.

[0013] Thirdly, embodiments of this application provide a control device for a thermal management system, applied to the thermal management system described above, the device comprising: The first cooling control module is used to respond to the cooling command sent by the first controller of the power battery when the cab does not need to be refrigerated and the ambient temperature of the electric mining truck is higher than the preset ambient temperature. It performs cooling classification on the current temperature information of the power battery according to the first classification strategy, so as to control the first compressor cooling circuit and / or the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition according to the classification result. The second cooling control module is used to control the first compressor cooling circuit to output cooling medium to cool the cab in response to the cooling command sent by the second controller in the cab when the cab needs to be cooled. The third cooling control module is used to respond to the cooling command sent by the first controller of the power battery when the cab needs to be cooled and the ambient temperature of the electric mining truck is higher than the preset ambient temperature. It performs cooling classification on the current temperature information of the power battery according to the second classification strategy, so as to control the second compressor cooling circuit to cool the power battery according to the classification result, or control the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition. The heating control module is used to control the heating circuit to heat the power battery temperature control circuit in response to a heating command sent by the first controller of the power battery when the ambient temperature of the electric mining truck is lower than the preset ambient temperature; and to control the radiator cooling circuit to air cool the power battery temperature control circuit in response to a cooling command sent by the first controller of the power battery, so as to cool the power battery to the point that it meets the cooling exit condition.

[0014] Fourthly, embodiments of this application provide an electronic device, which includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; When a processor executes a program stored in memory, it implements the steps of the control method for the thermal management system as described above.

[0015] Fifthly, embodiments of this application provide an electric mining vehicle, including the thermal management system described above, or the control device described above, or the electronic device described above.

[0016] In this embodiment, by integrating the first compressor cooling circuit, the second compressor cooling circuit, the radiator cooling circuit, and the heating circuit into the thermal management system, precise and efficient temperature control of the power battery and the cab of the electric mining truck is achieved. This ensures the safety and long life of the power battery, improves the vehicle's range and energy efficiency, and also provides system redundancy and driving comfort, thereby ensuring the reliable and efficient operation of the electric mining truck under harsh working conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the thermal management system provided in the embodiments of this application; Figure 2 This is a flowchart illustrating the control method of the thermal management system provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the control device of the thermal management system provided in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the electric mining truck provided in the embodiments of this application.

[0019] In the picture: 1-First temperature and pressure sensor, 2-First compressor, 3-First condenser, 4-First pressure sensor, 5-Electronic expansion valve, 6-First plate heat exchanger, 7-Second temperature and pressure sensor, 8-First electric fan, 9-Air conditioning evaporator, 10-Solenoid valve, 11-Second compressor, 12-Second condenser, 13-Second pressure sensor, 14-Thermal valve, 15-Second plate heat exchanger, 16-Third temperature and pressure sensor, 17-Second electric fan, 18-Electric drive motor, 19-First bubble separator, 20-Radiator, 21-First temperature sensor, 22-First water pump, 23-First four-way valve, 24-Third electric fan, 25-Second bubble separator, 26-Second water pump, 27-PTC heater, 28-Air conditioning heating system, 29-Second four-way valve, 30-Power battery, 31-Third bubble separator, 32-Third water pump, 33-Second temperature sensor, 34-Third temperature sensor. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0021] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0022] The control method, device, electric mining car, and medium of the thermal management system provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0023] Those skilled in the art will understand that the control method of the thermal management system provided in the embodiments of this application can be executed by a single or distributed processor of an electric mining vehicle. There can be one or more processors. In the case of multiple processors, the multiple processors can be electrically connected or communicatively connected to jointly execute the control method of the thermal management system provided in the embodiments of this application as modules with different functions.

[0024] Please see Figure 1This is a schematic diagram of the thermal management system provided in an embodiment of this application. The first aspect of this application provides a thermal management system applied to an electric mining truck. The system includes a first compressor cooling circuit, a second compressor cooling circuit, a radiator cooling circuit, and a heating circuit. The first compressor cooling circuit is connected to both the cab cooling pipes and the power battery temperature control circuit within the cab. When the ambient temperature of the electric mining truck is higher than a preset ambient temperature, the first compressor cooling circuit outputs a cooling medium to the cab cooling pipes and / or the power battery temperature control circuit to cool the cab and / or the power battery 30. The second compressor cooling circuit is connected to the power battery temperature control circuit. When the ambient temperature of the electric mining truck is higher than the preset ambient temperature, the second compressor cooling circuit outputs a cooling medium to the power battery temperature control circuit to cool the power battery 30. The radiator cooling circuit is connected to the power battery temperature control circuit. When the ambient temperature of the electric mining truck is lower than the preset ambient temperature, the radiator cooling circuit provides air cooling to the power battery temperature control circuit. The heating circuit is connected to the power battery temperature control circuit and is used to heat the power battery temperature control circuit. The heating circuit is also used to provide heating air to the cab.

[0025] It should be noted that when the ambient temperature of the electric mining truck is higher than the preset ambient temperature, the first compressor cooling circuit responds to the cooling command sent by the first controller of the power battery 30 and outputs cooling medium to the power battery temperature control circuit to cool the power battery 30; the first compressor cooling circuit responds to the cooling command sent by the second controller of the cab and controls the first compressor cooling circuit to output cooling medium to cool the cab cooling pipes to cool the cab. Therefore, the first compressor cooling circuit can output cooling medium to the power battery temperature control circuit and also to the cab cooling pipes.

[0026] The second compressor cooling circuit here only outputs cooling medium to the power battery temperature control circuit to cool the power battery 30.

[0027] Since the ambient temperature of the electric mining truck is lower than the preset ambient temperature, the power battery temperature control circuit can be cooled by air through the radiator cooling circuit, thus avoiding the energy waste of starting the first compressor cooling circuit and the second compressor cooling circuit in low temperature environment.

[0028] Meanwhile, when the temperature of the power battery 30 is too low and heating or heat preservation is required, the power battery 30 is heated through the heating circuit to ensure that the power battery 30 works at a suitable temperature. In addition, the heating circuit can also provide air conditioning heating for the cab, and the electric mining truck can directly use electrical energy to generate heat, which is faster and more precise than the waste heat utilization of traditional fuel vehicles.

[0029] In this embodiment, by integrating the first compressor cooling circuit, the second compressor cooling circuit, the radiator cooling circuit, and the heating circuit into the thermal management system, precise and efficient temperature control of the power battery 30 and the cab of the electric mining truck is achieved. This ensures the safety and long lifespan of the power battery 30, improves the vehicle's range and energy efficiency, provides system redundancy and driving comfort, and ensures reliable and efficient operation of the electric mining truck under harsh working conditions.

[0030] In some possible embodiments, the first compressor cooling circuit includes a first temperature and pressure sensor 1, a first compressor 2, a first condenser 3, a first pressure sensor 4, an electronic expansion valve 5, a first plate heat exchanger 6, and a second temperature and pressure sensor 7 connected in sequence to form a circuit; the first condenser 3 is equipped with a first electronic fan 8, one end of the cab cooling pipe is connected to the pipe located between the electronic expansion valve 5 and the first pressure sensor 4, and the other end of the cab cooling pipe is connected to the pipe located between the first temperature and pressure sensor 1 and the second temperature and pressure sensor 7; the first plate heat exchanger 6 is also connected to the power battery temperature control circuit.

[0031] Here, the cab cooling piping includes an air conditioning evaporator 9 and a solenoid valve 10 connected in sequence. The air conditioning evaporator 9 is connected to a piping located between the electronic expansion valve 5 and the first pressure sensor 4 via a piping. The solenoid valve 10 is connected to a piping located between the first temperature and pressure sensor 1 and the second temperature and pressure sensor 7.

[0032] In this embodiment, by connecting one end of the cab cooling pipe to the pipe located between the electronic expansion valve 5 and the first pressure sensor 4, and the other end of the cab cooling pipe to the pipe located between the first temperature and pressure sensor 1 and the second temperature and pressure sensor 7, and by connecting the first plate heat exchanger 6 to the power battery temperature control circuit, it is possible to connect both the cab cooling pipe and the power battery 30 cooling circuit to the first compressor cooling circuit, so that the first compressor 2 in the first compressor cooling circuit can provide cooling medium to the cab cooling pipe and the power battery 30 cooling circuit respectively.

[0033] Among them, by controlling the electronic expansion valve 5, the on / off control of the closed loop formed by the first temperature and pressure sensor 1, the first compressor 2, the first condenser 3, the first pressure sensor 4, the electronic expansion valve 5, the first plate heat exchanger 6, and the second temperature and pressure sensor 7 can be realized, thereby realizing the cooling of the power battery 30 by the cooling circuit of the first compressor; by controlling the solenoid valve 10, the cooling of the air conditioner evaporator 9 by the first compressor 2 can be controlled.

[0034] The second compressor cooling circuit includes a second compressor 11, a second condenser 12, a second pressure sensor 13, a thermal valve 14, a second plate heat exchanger 15, and a third temperature and pressure sensor 16 connected in sequence to form a circuit; the second condenser 12 is equipped with a second electric fan 17, and the second plate heat exchanger 15 is also connected to the first plate heat exchanger 6 and the power battery temperature control circuit through pipelines.

[0035] Here, the second plate heat exchanger 15 and the first plate heat exchanger 6 can be connected in parallel via pipelines.

[0036] In this embodiment, by connecting the second compressor 11, the second condenser 12, the second pressure sensor 13, the thermal valve 14, the second plate heat exchanger 15, and the third temperature and pressure sensor 16 in sequence to form a circuit, and connecting it to the first plate heat exchanger 6, a completely parallel and independent refrigeration system can be formed between the second compressor cooling circuit and the first compressor cooling circuit. At the same time, by connecting the second plate heat exchanger 15 and the power battery temperature control circuit through pipelines, the second compressor cooling circuit can be dedicated to cooling the power battery 30. This allows the second compressor cooling circuit to start independently or work in conjunction with the first compressor cooling circuit when the electric mining vehicle is carrying a heavy load uphill, fast charging, or is in extremely high ambient temperatures, and the power battery 30 generates a high amount of heat. This provides double or enhanced cooling power to the power battery 30, ensuring that the temperature of the power battery 30 is controlled within a safe temperature range.

[0037] The radiator cooling circuit includes an electric drive motor 18, a first bubble separator 19, a radiator 20, a first temperature sensor 21, a first water pump 22, and a first four-way valve 23 connected in sequence to form a circuit. The radiator 20 is equipped with a third electric fan 24. The first four-way valve 23 is also connected to the power battery temperature control circuit.

[0038] When the ambient temperature of the electric mining truck is lower than the preset ambient temperature, but the power battery 30 is still generating heat due to charging and discharging, the radiator cooling circuit is activated.

[0039] In this embodiment, the circuit formed by the electric drive motor 18, the first bubble separator 19, the radiator 20, the first temperature sensor 21, the first water pump 22, and the first four-way valve 23 can dissipate the heat of the power battery 30 directly into the environment by relying solely on the third electric fan 24 to blow on the radiator 20 and using the ambient low-temperature air to cool the coolant, without using the high-energy-consuming first compressor cooling circuit and second compressor cooling circuit. This avoids the huge energy waste caused by starting the compressor at low temperatures and significantly improves the vehicle's range under low temperature and medium-low load conditions.

[0040] The heating circuit includes a second bubble separator 25, a second water pump 26, a PTC heater 27, an air conditioning heating system 28, and a second four-way valve 29 connected in sequence to form a circuit. The second four-way valve 29 is also connected to the power battery temperature control circuit.

[0041] Here, the power battery temperature control circuit includes a third bubble separator 31, a third water pump 32, a power battery 30, a second temperature sensor 33, and a third temperature sensor 34. The third bubble separator 31, the third water pump 32, and the second temperature sensor 33 are connected sequentially through pipelines. The second bubble separator 31 is connected to the first four-way valve 23, and the second temperature sensor 33 is connected to both the first plate heat exchanger 5 and the second plate heat exchanger 15. The power battery 30 and the third temperature sensor 34 are connected through pipelines. The power battery 30 is connected to the first four-way valve 23, and the third temperature sensor 34 is connected to the second four-way valve 29.

[0042] In this embodiment, by integrating a high-efficiency PTC heater 27, a set of intelligent flow distribution valves (second four-way valve 29), and two sets of heat-using terminals (air conditioning heating system 28 and power battery temperature control circuit), active, rapid, and on-demand heating of the power battery 30 and the cab is achieved. While ensuring the safety and performance of the power battery 30 under extremely cold conditions, a comfortable driving environment is provided. The second bubble separator 25 and the second water pump 26 ensure the efficient and reliable operation of the heating circuit.

[0043] Please see Figure 2 This is a flowchart illustrating a control method for a thermal management system provided in an embodiment of this application. A second aspect of this application provides a control method for a thermal management system, applied to the thermal management system of the first aspect. The method includes the following steps: S110. When the cab does not require cooling and the ambient temperature of the electric mining truck is higher than the preset ambient temperature, in response to the cooling command sent by the first controller of the power battery, the current temperature information of the power battery is classified according to the first classification strategy, so as to control the first compressor cooling circuit and / or the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition according to the classification result.

[0044] Here, the first-level strategy will classify the power battery according to its current temperature information to determine whether to activate only the first compressor cooling circuit, only the second compressor cooling circuit, or both the first and second compressor cooling circuits. This avoids the thermal management system having excessive cooling capacity and achieves the effect of supplying cooling medium to the power battery on demand.

[0045] S120. When the cab needs to be cooled, in response to the cooling command sent by the second controller in the cab, the first compressor cooling circuit is controlled to output cooling medium to cool the cab cooling pipes.

[0046] S130. When the cab needs to be cooled and the ambient temperature of the electric mining truck is higher than the preset ambient temperature, in response to the cooling command sent by the first controller of the power battery, the current temperature information of the power battery is classified according to the second classification strategy, so as to control the second compressor cooling circuit to cool the power battery according to the classification result, or control the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition.

[0047] When both the cab and the power battery require cooling, the second-level strategy takes effect. Prioritizing the basic comfort of the cab, the first compressor cooling circuit continues to output cooling medium to the cab's cooling pipes. Then, based on the current temperature information of the power battery, it decides whether to activate the second compressor cooling circuit alone to cool the power battery, or to activate both the first and second compressor cooling circuits simultaneously when the power battery is at an extremely high temperature.

[0048] S140. When the ambient temperature of the electric mining truck is lower than the preset ambient temperature, in response to the heating command sent by the first controller of the power battery, the heating circuit is controlled to heat the power battery temperature control circuit; and in response to the cooling command sent by the first controller of the power battery, the radiator cooling circuit is controlled to air cool the power battery temperature control circuit so that the power battery is cooled to the point where it meets the cooling exit condition.

[0049] Since the electric mining truck needs to heat the power battery when it starts up when the ambient temperature is lower than the preset ambient temperature, the heating circuit can be controlled to heat the power battery temperature control circuit by responding to the heating command sent by the first controller of the power battery. If the first compressor cooling circuit or the second compressor cooling circuit is used to cool the power battery, it will easily lead to a waste of energy consumption. Therefore, the power battery temperature control circuit is air-cooled by the radiator cooling circuit.

[0050] By employing the above method, different cooling methods can be selected for the power battery based on varying ambient temperatures. Specifically, when the ambient temperature of the electric mining truck is higher than a preset ambient temperature, the first compressor cooling circuit and / or the second compressor cooling circuit are used to cool the power battery. Simultaneously, based on the cooling requirements of the cab, the current temperature information of the power battery requiring cooling is categorized according to different grading strategies, achieving the effect of supplying cooling medium to the power battery on demand. Furthermore, when the ambient temperature of the electric mining truck is lower than the preset ambient temperature, the power battery temperature control circuit is air-cooled via a radiator cooling circuit, avoiding the energy waste caused by cooling the power battery through the first or second compressor cooling circuit. Therefore, this application can achieve coupled control of the cooling of the cab and the power battery, reduce the energy consumption of the thermal management system, and ensure sufficient cooling capacity for the power battery under different operating conditions.

[0051] In some possible implementations, the current temperature information of the power battery includes the highest cell temperature of the power battery in the non-charging state and the battery inlet temperature; the first classification strategy includes at least one of the first classification rule, the second classification rule and the third classification rule.

[0052] The first classification rule includes: if the highest cell temperature of the power battery in the non-charging state is between the first preset temperature and the second preset temperature, and the battery inlet temperature is not higher than the third preset temperature, then the cooling classification of the power battery is determined to be level one; wherein, the first preset temperature is higher than the second preset temperature, and the third preset temperature is lower than the second preset temperature.

[0053] Here, the first preset temperature can be 32℃, the second preset temperature can be 28℃, and the third preset temperature can be 20℃.

[0054] The second classification rule includes: if the highest cell temperature of the power battery in the non-charging state is not lower than the second preset temperature, and the battery inlet temperature is higher than the third preset temperature, then the cooling classification of the power battery is determined to be level two.

[0055] The third classification rule includes: if the highest cell temperature of the power battery in the non-charging state is not lower than the fourth preset temperature, then the cooling classification of the power battery is determined to be level three; the fourth preset temperature is higher than the first preset temperature.

[0056] Here, the fourth preset temperature can be 35℃.

[0057] The cooling of the power battery is graded according to the current temperature information of the power battery based on the first grading strategy, and the cooling circuit of the first compressor and / or the cooling circuit of the second compressor is controlled to cool the power battery according to the grading result. This may include the following steps: S210. If the cooling level of the power battery is determined to be Level 1, then the cooling medium output by the cooling circuit of the first compressor is controlled to cool the power battery.

[0058] Since the cooling level of the power battery is determined to be Level 1, the output of the cooling medium from the compressor is relatively small. Therefore, it is sufficient to prioritize the cooling medium output from the first compressor cooling circuit to cool the power battery.

[0059] S220. If the cooling level of the power battery is determined to be level two, then the cooling medium output by the cooling circuit of the second compressor is controlled to cool the power battery.

[0060] Since the cooling level of the power battery is determined to be level two, the output of the cooling medium from the power battery compressor is relatively large. Therefore, the cooling medium output from the cooling circuit of the second compressor is prioritized to cool the power battery.

[0061] S230. If the cooling level of the power battery is determined to be three levels, then the cooling medium output by the cooling circuit of the first compressor and the cooling circuit of the second compressor simultaneously is controlled to cool the power battery.

[0062] Since the cooling level of the power battery is determined to be three levels, the output of the cooling medium from the power battery compressor is the largest. Therefore, the cooling medium output from the first compressor cooling circuit and the second compressor cooling circuit is controlled simultaneously to cool the power battery.

[0063] By using the above method, it is possible to control the cooling circuits of the first and second compressors to cool the power batteries with different cooling requirements, ensuring that the power batteries under different cooling levels have sufficient cooling capacity.

[0064] In some possible implementations, if the cooling level of the power battery is determined to be Level 1, after controlling the cooling medium output by the first compressor cooling circuit to cool the power battery, the following steps may be included: after the cooling time of the power battery by the first compressor cooling circuit reaches a first preset time, if the power battery fails to cool to its cooling exit condition, the cooling medium output by the second compressor cooling circuit is controlled so that the first compressor cooling circuit and the second compressor cooling circuit simultaneously cool the power battery.

[0065] If the power battery fails to reach its cooling exit condition after the first preset time, it means that the amount of cooling medium output by the first compressor cooling circuit is insufficient to cool the power battery. Therefore, the second compressor cooling circuit needs to be turned on so that the first compressor cooling circuit and the second compressor cooling circuit can cool the power battery simultaneously, thereby achieving the purpose of cooling the power battery.

[0066] In some possible implementations, if the cooling level of the power battery is determined to be level two, after controlling the cooling medium output by the second compressor cooling circuit to cool the power battery, the following steps may also be included: after the cooling time of the power battery by the second compressor cooling circuit reaches a second preset time, if the power battery fails to cool to its cooling exit condition, the cooling medium output by the first compressor cooling circuit is controlled so that the first compressor cooling circuit and the second compressor cooling circuit simultaneously cool the power battery.

[0067] If the power battery fails to reach its cooling exit condition after the second preset time, it means that the amount of cooling medium output by the second compressor cooling circuit is insufficient to cool the power battery. Therefore, the first compressor cooling circuit needs to be activated to cool the power battery, so that the first compressor cooling circuit and the second compressor cooling circuit can simultaneously cool the power battery, thereby achieving the purpose of cooling the power battery.

[0068] In some possible implementations, the second hierarchical strategy includes at least one of a fourth hierarchical rule, a fifth hierarchical rule, and a sixth hierarchical rule.

[0069] The fourth classification rule includes: if the battery inlet temperature is not lower than the fifth preset temperature, and the highest cell temperature of the power battery in the non-charging state is between the second preset temperature and the fourth preset temperature, then the cooling classification of the power battery is determined to be level four; wherein, the fifth preset temperature is the temperature between the second preset temperature and the third preset temperature.

[0070] Here, the fifth preset temperature can be 26℃.

[0071] The fifth classification rule includes: if the battery inlet temperature is lower than the fifth preset temperature, and the highest cell temperature of the power battery in the non-charging state is between the second preset temperature and the fourth preset temperature, then the cooling classification of the power battery is determined to be level five.

[0072] The sixth classification rule includes: if the highest cell temperature is not lower than the fourth preset temperature, then the cooling classification of the power battery is determined to be level six.

[0073] The cooling process is graded based on the current temperature information of the power battery according to the second grading strategy. The second compressor cooling circuit is then controlled to cool the power battery based on the grading results, or the first and second compressor cooling circuits are controlled to cool the power battery. This process may include the following steps: S310. If the cooling level of the power battery is determined to be four levels, then the cooling medium output by the cooling circuit of the second compressor is controlled to cool the power battery.

[0074] Since the cooling level of the power battery is set to level four, the output of the cooling medium from the power battery to the compressor is relatively small. Therefore, while maintaining the output of the cooling medium from the first compressor cooling circuit to the cab cooling pipe, it is sufficient to control the cooling medium output from the second compressor cooling circuit to cool the power battery.

[0075] S320. If the cooling level of the power battery is determined to be level five, then the cooling medium output by the cooling circuit of the second compressor is controlled to cool the power battery.

[0076] Since the cooling level of the power battery is set to level five, the output of the cooling medium from the power battery to the compressor is relatively small. Therefore, while maintaining the output of the cooling medium from the first compressor cooling circuit to the cab cooling pipe, it is sufficient to control the cooling medium output from the second compressor cooling circuit to cool the power battery.

[0077] S330. If the cooling level of the power battery is determined to be level six, then the cooling medium output by the cooling circuit of the first compressor and the cooling circuit of the second compressor simultaneously is controlled to cool the power battery.

[0078] Since the power battery's cooling level is set to level six, the power battery outputs the most cooling medium from the compressor. Therefore, the cooling medium output from both the first and second compressor cooling circuits is prioritized to cool the power battery.

[0079] By adopting the above method, it is possible to control the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery with different cooling requirements when the cab needs to be cooled. This ensures that while the first compressor cooling circuit is cooling the cab, it can also provide sufficient cooling capacity to the power battery under different cooling levels.

[0080] In addition, when the power battery is charging, the first compressor cooling circuit and the second compressor cooling circuit need to be activated to cool the power battery.

[0081] In some possible implementations, if the cooling level of the power battery is determined to be five levels, after controlling the cooling medium output by the second compressor cooling circuit to cool the power battery, the following steps may also be included: after the second compressor cooling circuit cools the power battery for a third preset time, if the power battery fails to cool to its cooling exit condition, the cooling medium output by the first compressor cooling circuit is controlled so that the first compressor cooling circuit and the second compressor cooling circuit cool the power battery simultaneously.

[0082] If the power battery fails to reach its cooling exit condition after the third preset time, it means that the amount of cooling medium output by the second compressor cooling circuit is insufficient to cool the power battery. Therefore, the first compressor cooling circuit needs to be activated to cool the power battery, so that the first compressor cooling circuit and the second compressor cooling circuit can simultaneously cool the power battery, thereby achieving the purpose of cooling the power battery.

[0083] In some possible implementations, the cooling exit condition is when the highest cell temperature of the power battery is lower than a second preset temperature, or the average cell temperature of the power battery is lower than a sixth preset temperature.

[0084] Here, the sixth preset temperature can be 24℃.

[0085] In addition, when the highest cell temperature of the power battery is higher than the second preset temperature, or the average cell temperature of the power battery is higher than the sixth preset temperature, the first controller of the power battery sends a cooling command to the thermal management system.

[0086] Please see Figure 3 This is a schematic diagram of the structure of a control device for a thermal management system provided in an embodiment of this application. A third aspect of this application provides a control device for a thermal management system, applied to the thermal management system provided in the second aspect. The device includes: The first cooling control module 410 is used to respond to the cooling command sent by the first controller of the power battery when the cab does not need to be refrigerated and the ambient temperature of the electric mining truck is higher than the preset ambient temperature. It performs cooling classification on the current temperature information of the power battery according to the first classification strategy, so as to control the first compressor cooling circuit and / or the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition according to the classification result. The second cooling control module 420 is used to control the first compressor cooling circuit to output cooling medium to cool the cab in response to the cooling command sent by the second controller in the cab when the cab needs to be cooled. The third cooling control module 430 is used to respond to the cooling command sent by the first controller of the power battery when the cab needs to be cooled and the ambient temperature of the electric mining truck is higher than the preset ambient temperature. It performs cooling classification on the current temperature information of the power battery according to the second classification strategy, so as to control the second compressor cooling circuit to cool the power battery according to the classification result, or control the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition. The heating control module 440 is used to control the heating circuit to heat the power battery temperature control circuit in response to a heating command sent by the first controller of the power battery when the ambient temperature of the electric mining truck is lower than the preset ambient temperature; and to control the radiator cooling circuit to air cool the power battery temperature control circuit in response to a cooling command sent by the first controller of the power battery, so as to cool the power battery to the point that it meets the cooling exit condition.

[0087] Optionally, the current temperature information of the power battery includes the highest cell temperature of the power battery in the non-charging state and the battery inlet temperature; the first classification strategy includes at least one of the first classification rule, the second classification rule and the third classification rule; The first classification rule includes: if the highest cell temperature of the power battery in the non-charging state is between the first preset temperature and the second preset temperature, and the battery inlet temperature is not higher than the third preset temperature, then the cooling classification of the power battery is determined to be level one; wherein, the first preset temperature is higher than the second preset temperature, and the third preset temperature is lower than the second preset temperature. The second classification rule includes: if the highest cell temperature of the power battery in the non-charging state is not lower than the second preset temperature, and the battery inlet temperature is higher than the third preset temperature, then the cooling classification of the power battery is determined to be level two. The third classification rule includes: if the highest cell temperature of the power battery in the non-charging state is not lower than the fourth preset temperature, then the cooling classification of the power battery is determined to be level three; the fourth preset temperature is higher than the first preset temperature. The first cooling control module includes: The first cooling control unit is used to control the cooling medium output by the first compressor cooling circuit to cool the power battery if the cooling level of the power battery is determined to be level one. The second cooling control unit is used to control the cooling medium output by the second compressor cooling circuit to cool the power battery if the cooling level of the power battery is determined to be level two. The third cooling control unit is used to control the cooling medium output by the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery if the cooling level of the power battery is determined to be three levels.

[0088] Optionally, the first cooling control module further includes: The fourth cooling control unit is used to control the cooling medium output by the second compressor cooling circuit if the power battery fails to cool to the cooling exit condition after the first compressor cooling circuit has cooled the power battery for a first preset time. This is to enable the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery simultaneously.

[0089] Optionally, the first cooling control module further includes: The fifth cooling control unit is used to control the cooling medium output by the first compressor cooling circuit if the power battery fails to cool to the cooling exit condition after the second compressor cooling circuit has cooled the power battery for a second preset time. This is to enable the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery simultaneously.

[0090] Optionally, the second classification strategy includes at least one of the fourth classification rule, the fifth classification rule, and the sixth classification rule; The fourth classification rule includes: if the battery inlet temperature is not lower than the fifth preset temperature, and the highest cell temperature of the power battery in the non-charging state is between the second preset temperature and the fourth preset temperature, then the cooling classification of the power battery is determined to be level four; wherein, the fifth preset temperature is the temperature between the second preset temperature and the third preset temperature. The fifth classification rule includes: if the battery inlet temperature is lower than the fifth preset temperature, and the highest cell temperature of the power battery in the non-charging state is between the second preset temperature and the fourth preset temperature, then the cooling classification of the power battery is determined to be level five. The sixth classification rule includes: if the highest cell temperature is not lower than the fourth preset temperature, then the cooling classification of the power battery is determined to be level six; The third cooling control module includes: The sixth cooling control unit is used to control the cooling medium output by the second compressor cooling circuit to cool the power battery if the cooling level of the power battery is determined to be level four. The seventh cooling control unit is used to control the cooling medium output by the second compressor cooling circuit to cool the power battery if the cooling level of the power battery is determined to be level five. The eighth cooling control unit is used to control the cooling medium output by the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery if the cooling level of the power battery is determined to be level six.

[0091] Optionally, the third cooling control module also includes: The ninth cooling control unit is used to control the cooling medium output by the first compressor cooling circuit if the power battery fails to cool to the cooling exit condition after the second compressor cooling circuit has cooled the power battery for a third preset time. This is to enable the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery simultaneously.

[0092] The control device for the thermal management system provided in the third aspect of this application can realize the various processes implemented in the above method embodiments and achieve the same beneficial effects. To avoid repetition, it will not be described again here.

[0093] A third aspect of this application provides an electric mining truck 500, including the above-described thermal management system or the control device of the above-described thermal management system.

[0094] Please see Figure 4 This is a schematic diagram of the structure of an electric mining vehicle provided in an embodiment of this application. In some possible implementation embodiments, an electric mining vehicle 500 further includes a processor 510 and a memory 520. The memory 520 stores machine-executable instructions that can be executed by the processor 510. The processor 510 can execute the machine-executable instructions to implement the control method of the above-mentioned thermal management system.

[0095] A fourth aspect of this application provides a computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to implement the control method of the thermal management system described above.

[0096] In one embodiment of this application, a computer program product is also provided, including a computer program that, when executed by a processor, implements the control method of the thermal management system according to the above embodiments.

[0097] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0098] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 The computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0099] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0100] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0101] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0102] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0103] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0104] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A thermal management system applied to electric mining trucks, characterized in that, include: The first compressor cooling circuit is connected to both the cab cooling pipe and the power battery temperature control circuit in the cab. When the ambient temperature of the electric mining truck is higher than the preset ambient temperature, the first compressor cooling circuit is used to output cooling medium to the cab cooling pipe and / or the power battery temperature control circuit to cool the cab and / or the power battery. The second compressor cooling circuit is connected to the power battery temperature control circuit. When the ambient temperature of the electric mining vehicle is higher than the preset ambient temperature, the second compressor cooling circuit is used to output a cooling medium to the power battery temperature control circuit to cool the power battery. The radiator cooling circuit is connected to the power battery temperature control circuit. When the ambient temperature of the electric mining vehicle is lower than the preset ambient temperature, the radiator cooling circuit is used to air cool the power battery temperature control circuit. A heating circuit is connected to the power battery temperature control circuit, and the heating circuit is used to heat the power battery temperature control circuit; the heating circuit is also used to provide air conditioning heating to the cab.

2. The thermal management system according to claim 1, characterized in that, The first compressor cooling circuit includes a first temperature and pressure sensor, a first compressor, a first condenser, a first pressure sensor, an electronic expansion valve, a first plate heat exchanger, and a second temperature and pressure sensor connected in sequence to form a circuit. The first condenser is equipped with a first electronic fan. One end of the cab cooling pipe is connected to a pipe located between the electronic expansion valve and the first pressure sensor, and the other end of the cab cooling pipe is connected to a pipe located between the first temperature and pressure sensor and the second temperature and pressure sensor. The first plate heat exchanger is also connected to the power battery temperature control circuit. The second compressor cooling circuit includes a second compressor, a second condenser, a second pressure sensor, a thermal valve, a second plate heat exchanger, and a third temperature and pressure sensor connected in sequence to form a circuit; the second condenser is equipped with a second electric fan, and the second plate heat exchanger is also connected to the first plate heat exchanger and the power battery temperature control circuit through pipelines; The radiator cooling circuit includes an electric drive motor, a first bubble separator, a radiator, a first temperature sensor, a first water pump, and a first four-way valve connected in sequence to form a circuit. The radiator is equipped with a third electronic fan. The first four-way valve is also connected to the power battery temperature control circuit. The heating circuit includes a second bubble separator, a second water pump, a PTC heater, an air conditioning heating system, and a second four-way valve connected in sequence to form a circuit. The second four-way valve is also connected to the power battery temperature control circuit.

3. A control method for a thermal management system, characterized in that, The method is applied to the thermal management system according to claim 1 or 2, and the method includes: When the cab does not require cooling and the ambient temperature of the electric mining truck is higher than the preset ambient temperature, in response to the cooling command sent by the first controller of the power battery, the current temperature information of the power battery is classified according to the first classification strategy, so as to control the first compressor cooling circuit and / or the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition according to the classification result. When the cab requires cooling, in response to a cooling command sent by the second controller in the cab, the first compressor cooling circuit is controlled to output cooling medium to cool the cab cooling pipes; When the cab requires cooling and the ambient temperature of the electric mining truck is higher than the preset ambient temperature, in response to the cooling command sent by the first controller of the power battery, the current temperature information of the power battery is classified according to the second classification strategy, so as to control the second compressor cooling circuit to cool the power battery according to the classification result, or control the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition. When the ambient temperature of the electric mining vehicle is lower than the preset ambient temperature, in response to a heating command sent by the first controller of the power battery, the heating circuit is controlled to heat the power battery temperature control circuit; and in response to a cooling command sent by the first controller of the power battery, the radiator cooling circuit is controlled to air cool the power battery temperature control circuit, so that the power battery is cooled to the point where it meets the cooling exit condition.

4. The method according to claim 1, characterized in that, The current temperature information of the power battery includes the highest cell temperature and the battery inlet temperature when the power battery is not charging; the first classification strategy includes at least one of the first classification rule, the second classification rule and the third classification rule; The first classification rule includes: if the highest cell temperature of the power battery in the non-charging state is between the first preset temperature and the second preset temperature, and the battery inlet temperature is not higher than the third preset temperature, then the cooling classification of the power battery is determined to be level one; wherein, the first preset temperature is higher than the second preset temperature, and the third preset temperature is lower than the second preset temperature. The second classification rule includes: if the highest cell temperature of the power battery in the non-charging state is not lower than the second preset temperature, and the battery inlet temperature is higher than the third preset temperature, then the cooling classification of the power battery is determined to be level two. The third grading rule includes: if the highest cell temperature of the power battery in the non-charging state is not lower than the fourth preset temperature, then the cooling grading of the power battery is determined to be level three; the fourth preset temperature is higher than the first preset temperature. The step of performing cooling classification based on the current temperature information of the power battery according to the first classification strategy, and controlling the first compressor cooling circuit and / or the second compressor cooling circuit to cool the power battery according to the classification result, includes: If the cooling level of the power battery is determined to be Level 1, then the cooling medium output from the cooling circuit of the first compressor is controlled to cool the power battery. If the cooling level of the power battery is determined to be level two, then the cooling medium output from the cooling circuit of the second compressor is controlled to cool the power battery. If the cooling level of the power battery is determined to be three levels, then the cooling medium output by the first compressor cooling circuit and the second compressor cooling circuit simultaneously is controlled to cool the power battery.

5. The method according to claim 4, characterized in that, After determining that the cooling level of the power battery is level one, and controlling the cooling medium output from the first compressor cooling circuit to cool the power battery, the method further includes: After the first compressor cooling circuit cools the power battery for a first preset time, if the power battery fails to cool to the cooling exit condition, the cooling medium output by the second compressor cooling circuit is controlled so that the first compressor cooling circuit and the second compressor cooling circuit simultaneously cool the power battery.

6. The method according to claim 4, characterized in that, After determining that the cooling level of the power battery is two-stage, and controlling the cooling medium output from the second compressor cooling circuit to cool the power battery, the method further includes: After the second compressor cooling circuit cools the power battery for a second preset time, if the power battery fails to cool to the cooling exit condition, the cooling medium output by the first compressor cooling circuit is controlled so that the first compressor cooling circuit and the second compressor cooling circuit cool the power battery simultaneously.

7. The method according to claim 4, characterized in that, The second classification strategy includes at least one of the fourth classification rule, the fifth classification rule, and the sixth classification rule; The fourth grading rule includes: if the battery inlet temperature is not lower than the fifth preset temperature, and the highest cell temperature of the power battery in the non-charging state is between the second preset temperature and the fourth preset temperature, then the cooling grading of the power battery is determined to be four levels; wherein, the fifth preset temperature is the temperature between the second preset temperature and the third preset temperature; The fifth classification rule includes: if the battery inlet temperature is lower than the fifth preset temperature, and the highest cell temperature of the power battery in the non-charging state is between the second preset temperature and the fourth preset temperature, then the cooling classification of the power battery is determined to be level five. The sixth grading rule includes: if the highest cell temperature is not lower than the fourth preset temperature, then the cooling grading of the power battery is determined to be level six; The step of performing cooling classification based on the current temperature information of the power battery according to the second classification strategy, and controlling the second compressor cooling circuit to cool the power battery according to the classification result, or controlling the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery, includes: If the cooling level of the power battery is determined to be four levels, then the cooling medium output by the cooling circuit of the second compressor is controlled to cool the power battery. If the cooling level of the power battery is determined to be level five, then the cooling medium output by the cooling circuit of the second compressor is controlled to cool the power battery. If the cooling level of the power battery is determined to be level six, then the cooling medium output by the first compressor cooling circuit and the second compressor cooling circuit simultaneously is controlled to cool the power battery.

8. The method according to claim 7, characterized in that, After determining that the cooling level of the power battery is five levels, and controlling the cooling medium output from the second compressor cooling circuit to cool the power battery, the method further includes: After the second compressor cooling circuit has cooled the power battery for a third preset time, if the power battery fails to cool to the cooling exit condition, the cooling medium output by the first compressor cooling circuit is controlled so that the first compressor cooling circuit and the second compressor cooling circuit simultaneously cool the power battery.

9. A control device for a thermal management system, applied to the thermal management system of claim 1 or 2, characterized in that, The device includes: The first cooling control module is used to respond to the cooling command sent by the first controller of the power battery when the cab does not need to be refrigerated and the ambient temperature of the electric mining truck is higher than the preset ambient temperature. It performs cooling classification on the current temperature information of the power battery according to the first classification strategy, so as to control the first compressor cooling circuit and / or the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition according to the classification result. The second cooling control module is used to control the first compressor cooling circuit to output cooling medium to cool the cab in response to a cooling command sent by the second controller of the cab when the cab needs to be cooled. The third cooling control module is used to respond to the cooling command sent by the first controller of the power battery when the cab needs to be cooled and the ambient temperature of the electric mining truck is higher than the preset ambient temperature. It performs cooling classification on the current temperature information of the power battery according to the second classification strategy, so as to control the second compressor cooling circuit to cool the power battery according to the classification result, or control the first compressor cooling circuit and the second compressor cooling circuit to cool the power battery until it reaches the cooling exit condition. The heating control module is used to control the heating circuit to heat the power battery temperature control circuit in response to a heating command sent by the first controller of the power battery when the ambient temperature of the electric mining vehicle is lower than the preset ambient temperature; and to control the radiator cooling circuit to air cool the power battery temperature control circuit in response to a cooling command sent by the first controller of the power battery, so as to cool the power battery to the point that it meets the cooling exit condition.

10. An electric mining car, characterized in that, It includes the thermal management system as described in claim 1 or 2, or the control device of the thermal management system as described in claim 9.

Images