Battery refrigeration control method, controller, battery refrigeration control system and automobile

Abstract

The application discloses a battery refrigeration control method, a controller, a battery refrigeration control system and a vehicle. The method comprises the following steps: obtaining target data corresponding to N cold plate control loops, each target data comprising a target superheat degree of a battery cold plate and cold plate measured data, and N is greater than or equal to 2; judging whether a target compensation condition is met according to the cold plate measured data corresponding to the N battery cold plates; if the target compensation condition is met, determining M to-be-compensated electronic expansion valves from the N electronic expansion valves, and 1 is less than or equal to M and M is less than or equal to N; obtaining a target compensation value corresponding to the to-be-compensated electronic expansion valves; determining a target opening degree of the to-be-compensated electronic expansion valves according to the target superheat degree of the battery cold plate and the target compensation value; and controlling the to-be-compensated electronic expansion valves to work according to the target opening degree of the to-be-compensated electronic expansion valves. The method can make the opening degree of the N electronic expansion valves fluctuate less, thereby achieving the purpose of guaranteeing the stability and control precision of battery refrigeration control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical control, in particular to a battery refrigeration control method, a controller, a battery refrigeration control system and a vehicle. BACKGROUND

[0002] In a heat pump air conditioning system including a battery refrigeration control system, the existing battery refrigeration control system includes at least one cold plate control loop, each cold plate control loop includes a battery cold plate and an electronic expansion valve, and the opening degree of the electronic expansion valve can be controlled according to the target superheat of the battery cold plate to control the refrigerant flow of the cold plate control loop. For example, when the heat pump air conditioning system is in a passenger cabin refrigeration mode, the opening degree of the electronic expansion valve on the evaporator side can be controlled according to the target superheat corresponding to the evaporator. For another example, when the heat pump air conditioning system is in a battery refrigeration mode, the opening degree of the electronic expansion valve on the battery side can be controlled according to the target superheat corresponding to the battery cold plate. For another example, when the heat pump air conditioning system is in a passenger cabin refrigeration mode and a battery refrigeration mode, the opening degree of the electronic expansion valve on the evaporator side is controlled according to the target superheat corresponding to the evaporator, and the opening degree of the electronic expansion valve on the battery side is controlled according to the target superheat corresponding to the battery cold plate. When the heat pump air conditioning system enters the battery refrigeration mode, due to the difference in heat generation of the multiple battery cold plates in the battery refrigeration control system, the opening degrees of the electronic expansion valves of different layers fluctuate greatly, affecting the stability and control accuracy of the battery refrigeration control. SUMMARY

[0003] The embodiments of the present application provide a battery refrigeration control method, a controller, a battery refrigeration control system and a vehicle to solve the problem of great fluctuation of the opening degrees of the electronic expansion valves of different layers.

[0004] The embodiments of the present application provide a battery refrigeration control method, which comprises the following steps.

[0005] Obtain target data corresponding to N cold plate control loops, each target data comprising target superheat corresponding to a battery cold plate and cold plate measured data, and N≥2;

[0006] Determine whether a target compensation condition is met according to the cold plate measured data corresponding to the N battery cold plates;

[0007] If the target compensation condition is met, determine M to-be-compensated expansion valves from the N electronic expansion valves, and 1≤M≤N;

[0008] Obtain a target compensation value corresponding to the to-be-compensated expansion valve, and determine a target opening degree of the to-be-compensated expansion valve according to the target superheat corresponding to the battery cold plate and the target compensation value;

[0009] Control the to-be-compensated expansion valve to work according to the target opening degree of the to-be-compensated expansion valve.

[0010] Preferably, the judging whether the target compensation condition is met according to the cold plate measured data corresponding to the N battery cold plates comprises:

[0011] According to the first cold plate data corresponding to the upper layer cold plate and the second cold plate data corresponding to the lower layer cold plate, a first target difference value is obtained;

[0012] If the first target difference value is outside the first compensation threshold range, it is determined that the target compensation condition is met;

[0013] If the first target difference value is within the first compensation threshold range, it is determined that the target compensation condition is not met.

[0014] Preferably, the determining M target compensation electronic expansion valves from the N electronic expansion valves comprises:

[0015] The electronic expansion valve corresponding to the larger value of the first cold plate data and the second cold plate data is determined as a target increase electronic expansion valve;

[0016] The electronic expansion valve corresponding to the smaller value of the first cold plate data and the second cold plate data is determined as a target decrease electronic expansion valve.

[0017] Preferably, the judging whether the target compensation condition is met according to the cold plate measured data corresponding to the N battery cold plates comprises:

[0018] According to the cold plate measured data corresponding to the N battery cold plates, a measured data mean value is obtained;

[0019] According to the cold plate measured data corresponding to the N battery cold plates and the measured data mean value, a second target difference value corresponding to the N battery cold plates is determined;

[0020] If the second target difference value corresponding to at least one battery cold plate is outside the second compensation threshold range, it is determined that the target compensation condition is met;

[0021] If the second target difference value corresponding to the N battery cold plates is within the second compensation threshold range, it is determined that the target compensation condition is not met.

[0022] Preferably, the determining M target compensation electronic expansion valves from the N electronic expansion valves comprises:

[0023] The electronic expansion valve whose second target difference value is outside the second compensation threshold range is determined as a target electronic expansion valve;

[0024] The target electronic expansion valve whose cold plate measured data is greater than the measured data mean value is determined as a target increase electronic expansion valve;

[0025] The target expansion valve is determined as a to-be-reduced expansion valve if the measured data of the cold plate is less than the average of the measured data.

[0026] Preferably, the determining whether the target compensation condition is met according to the cold plate measured data corresponding to the N battery cold plates comprises:

[0027] Any two of the cold plate measured data corresponding to the N battery cold plates are subjected to difference calculation to obtain N-1 third target differences.

[0028] If at least one of the third target differences is outside the third compensation threshold range, it is determined that the target compensation condition is met.

[0029] If all of the N-1 third target differences are within the third compensation threshold range, it is determined that the target compensation condition is not met.

[0030] Preferably, the determining M to-be-compensated expansion valves from the N electronic expansion valves comprises:

[0031] All of the third target differences outside the third compensation threshold range are determined as to-be-analyzed differences.

[0032] According to the order from large to small of all of the to-be-analyzed differences, the electronic expansion valve corresponding to the larger value of the two cold plate measured data corresponding to the to-be-analyzed difference is determined as a to-be-increased expansion valve, and the electronic expansion valve corresponding to the smaller value of the two cold plate measured data corresponding to the to-be-analyzed difference is determined as a to-be-reduced expansion valve.

[0033] Preferably, the determining whether the target compensation condition is met according to the cold plate measured data corresponding to the N battery cold plates comprises:

[0034] The pressure evaluation result is obtained according to the cold plate measured pressure corresponding to the N battery cold plates and a target pressure threshold range.

[0035] The temperature evaluation result is obtained according to the cold plate measured temperature corresponding to the N battery cold plates and a target temperature threshold range.

[0036] If at least one of the pressure evaluation result and the temperature evaluation result is a compensation control needed, it is determined that the target compensation condition is met.

[0037] If all of the pressure evaluation result and the temperature evaluation result are compensation control not needed, it is determined that the target compensation condition is not met.

[0038] Preferably, the obtaining the target compensation value corresponding to the to-be-compensated expansion valve comprises:

[0039] determine a target opening degree of the to-be-compensated expansion valve according to the original opening degree and the to-be-increased compensation value;

[0040] If the to-be-compensated expansion valve is a to-be-decreased expansion valve, a to-be-decreased compensation value corresponding to the to-be-compensated expansion valve is obtained, and a target opening degree of the to-be-compensated expansion valve is determined according to the original opening degree and the to-be-decreased compensation value.

[0041] If the to-be-compensated expansion valve is a to-be-decreased expansion valve, a to-be-decreased compensation value corresponding to the to-be-compensated expansion valve is obtained, and a target opening degree of the to-be-compensated expansion valve is determined according to the original opening degree and the to-be-decreased compensation value.

[0042] The embodiment of the present application provides a controller, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the battery refrigeration control method when executing the computer program.

[0043] The embodiment of the present application provides a battery refrigeration control system, which comprises the above-mentioned controller and N cold plate control circuits, N≥2; each cold plate control circuit comprises a battery cold plate, an electronic expansion valve and a target sensor, and the controller is connected with the target sensor and the electronic expansion valve.

[0044] The embodiment of the present application provides an automobile, which comprises the above-mentioned battery refrigeration control system.

[0045] The battery refrigeration control method, the controller, the battery refrigeration control system and the automobile can determine that the outlet pressure of the N battery cold plates fluctuates greatly when the cold plate measured data of the N battery cold plates meets the target compensation condition, which can cause the opening degree of the N electronic expansion valves to fluctuate greatly. Therefore, the N cold plate measured data needs to be further analyzed to determine M to-be-compensated expansion valves and target compensation values corresponding to the M to-be-compensated expansion valves from the N battery cold plates. Then, the target opening degree of each to-be-compensated expansion valve is determined according to the target compensation value corresponding to the to-be-compensated expansion valve and the target superheat degree corresponding to the to-be-compensated expansion valve, and the to-be-compensated expansion valve is controlled to work, so that the outlet pressure of the N battery cold plates fluctuates less, the system pressure can be quickly balanced, the opening degree of the N electronic expansion valves fluctuates less, and the stability and control precision of the battery refrigeration control are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0047] Figure 1 is a schematic diagram of a battery refrigeration control system in an embodiment of the present application;

[0048] Figure 2 is a flow chart of a battery refrigeration control method in an embodiment of the present application;

[0049] Figure 3 is another flow chart of a battery refrigeration control method in an embodiment of the present application;

[0050] Figure 4 is another flow chart of a battery refrigeration control method in an embodiment of the present application;

[0051] Figure 5 is another flow chart of a battery refrigeration control method in an embodiment of the present application;

[0052] Figure 6 is another flow chart of a battery refrigeration control method in an embodiment of the present application;

[0053] Figure 7 is another flow chart of a battery refrigeration control method in an embodiment of the present application;

[0054] Figure 8 is another flow chart of a battery refrigeration control method in an embodiment of the present application;

[0055] Figure 9 is another flow chart of a battery refrigeration control method in an embodiment of the present application;

[0056] Figure 10 is another flow chart of a battery refrigeration control method in an embodiment of the present application. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0058] The battery refrigeration control method provided by the embodiments of the present application can be applied in the battery refrigeration control system as shown in Figure 1 Figure 1 ​As shown in the figure, the battery refrigeration control system comprises a controller and N cold plate control loops, N≥2; each cold plate control loop comprises a battery cold plate, an electronic expansion valve and a target sensor, the target sensor being used to collect cold plate measured data corresponding to the battery cold plate; the controller is connected with the target sensor and the electronic expansion valve, and is used to adjust the opening degree of the electronic expansion valve according to the target superheat corresponding to the battery cold plate and the cold plate measured data.

[0059] The target sensor is a sensor arranged on the battery cold plate and used to realize signal collection. The cold plate measured data refers to measured data related to the battery cold plate and collected in real time, and specifically can be measured data collected in real time by the target sensor arranged on the battery cold plate. As an example, the target sensor includes but is not limited to a pressure sensor and / or a temperature sensor. The pressure sensor is arranged on the battery cold plate, and specifically is arranged at an outlet position of the battery cold plate, and is used to measure the cold plate measured pressure, which is the cold plate measured data corresponding to the battery cold plate. The temperature sensor can be arranged on the battery cold plate or between the battery cold plate and the electronic expansion valve, and is used to measure the cold plate measured temperature, which is the cold plate measured data corresponding to the battery cold plate.

[0060] The electronic expansion valve is used to control the voltage or current applied to the expansion valve by using an electric signal generated by a regulated parameter, so as to achieve the purpose of regulating the supply flow. As an example, the battery refrigeration control system comprises N cold plate control loops, and each cold plate control loop is provided with an electronic expansion valve. Here, the electronic expansion valve is a bidirectional electronic expansion valve.

[0061] As an example, the controller is connected with the target sensor and the electronic expansion valve, and can evaluate whether the target compensation condition is met according to the cold plate measured data collected in real time by the N target sensors; if the target compensation condition is not met, the opening degree of the electronic expansion valve is directly controlled according to the target superheat corresponding to the battery cold plate; if the target compensation condition is met, the target compensation value corresponding to the N cold plate control loops can be determined according to the cold plate measured data collected in real time by the N target sensors, and the opening degree of the electronic expansion valve is controlled according to the target compensation value and the target superheat, so as to achieve the purpose of guaranteeing the stability and control precision of the battery refrigeration control.

[0062] In an embodiment, as shown in the figure, a battery refrigeration control method is provided. Taking the controller in the battery refrigeration control system as an example, the method comprises the following steps: Figure 2 Figure 1 S201: Obtain target data corresponding to N cold plate control loops, each target data comprising target superheat corresponding to a battery cold plate and cold plate measured data, N≥2;

[0063] S201: Obtain target data corresponding to N cold plate control loops, each target data comprising target superheat corresponding to a battery cold plate and cold plate measured data, N≥2;

[0064] ​S202: Determine whether a target compensation condition is met according to the cold plate measured data corresponding to the N battery cold plates;

[0065] S203: If the target compensation condition is met, determine M to-be-compensated expansion valves from the N electronic expansion valves, 1≤M≤N;

[0066] S204: Obtain a target compensation value corresponding to the to-be-compensated expansion valve, and determine a target opening degree of the to-be-compensated expansion valve according to the target superheat degree of the battery cold plate and the target compensation value;

[0067] S205: Control the to-be-compensated expansion valve to work according to the target opening degree of the to-be-compensated expansion valve.

[0068] The cold plate control loop is a control loop in the battery refrigeration control system, and at least includes one battery cold plate and one electronic expansion valve. In this example, the electronic expansion valve can be a bidirectional electronic expansion valve.

[0069] The target data refers to data needed in the battery refrigeration control process. As an example, the target data corresponding to each cold plate control loop includes but is not limited to the target superheat degree of the battery cold plate and the cold plate measured data corresponding to the battery cold plate.

[0070] In this example, the target superheat degree refers to the superheat degree of the refrigerant in the battery cold plate that needs to be controlled this time. The superheat degree refers to the difference between the superheat temperature and the saturation temperature of the refrigerant under the same evaporation pressure in the refrigeration cycle, which can be understood as the temperature difference between the low-pressure side of the corresponding electronic expansion valve and the vapor in the temperature bulb. Understandably, the target superheat degree corresponding to each battery cold plate can be determined by existing technical means, which will not be described here.

[0071] In this example, the cold plate measured data refers to data related to the battery cold plate measured in real time. As an example, the cold plate measured data can be data measured in real time by a target sensor arranged on the cold plate control loop. For example, the target sensor can be a pressure sensor, and the cold plate measured data can include the cold plate measured pressure collected in real time by the pressure sensor arranged on the battery cold plate, specifically the cold plate measured pressure collected in real time by the pressure sensor arranged at the corresponding position of the battery cold plate. For example, the target sensor can be a temperature sensor, and the cold plate measured data can include the cold plate measured temperature collected in real time by the temperature sensor arranged on the battery cold plate, specifically the cold plate measured temperature collected in real time by the temperature sensor arranged between the battery cold plate and the electronic expansion valve. For example, the target sensor can be a pressure sensor and a temperature sensor, and the cold plate measured data can further include the cold plate measured pressure collected in real time by the pressure sensor and the cold plate measured temperature collected in real time by the temperature sensor.

[0072] As an example, in step S201, the controller needs to obtain target data corresponding to N cold plate control loops when the heat pump air conditioning system is in the battery refrigeration mode or in the passenger cabin refrigeration mode and the battery refrigeration mode. Specifically, the target superheat corresponding to the battery cold plate in each cold plate control loop and the cold plate measured data corresponding to the battery cold plate are obtained. The target superheat here is the main control parameter for controlling the opening degree of the electronic expansion valve in the cold plate control loop, and the cold plate measured data can be understood as the environmental data of the battery cold plate. Generally, in the case of a battery refrigeration control system including N cold plate control loops (N≥2), the battery cold plates in the N cold plate control loops are stacked. Due to the different positions of the battery cold plates in the N cold plate control loops, the temperature and / or pressure of the N battery cold plates differ greatly. If only the target superheat of the battery cold plate is used to control the opening degree of the corresponding electronic expansion valve, the outlet pressure of the N battery cold plates will fluctuate greatly, resulting in a large fluctuation in the opening degree of the N electronic expansion valves, which will affect the stability and control accuracy of the battery refrigeration control.

[0073] The target compensation condition is a condition for evaluating whether compensation control of the opening degree of the electronic expansion valve is needed.

[0074] As an example, in step S202, after obtaining the cold plate measured data corresponding to the N battery cold plates, the controller can analyze the differences between the N battery cold plates according to the cold plate measured data corresponding to the N battery cold plates, and determine the environmental differences of the N battery cold plates. Then, according to the analyzed environmental differences, it is evaluated whether the target compensation condition set in advance is met, to determine whether the opening degree of the electronic expansion valve controlled according to the target superheat can achieve stable control. For example, if the cold plate measured data includes temperature and / or pressure, the environmental differences of the N battery cold plates analyzed are temperature differences and / or pressure differences. According to these environmental differences, it is evaluated whether these environmental differences cause the outlet pressure of the N battery cold plates stacked to fluctuate greatly, and further cause the opening degree of the N electronic expansion valves to fluctuate greatly, so as to determine whether the target compensation condition is met.

[0075] The to-be-compensated expansion valve refers to the electronic expansion valve that needs to be compensated, that is, the opening degree of the electronic expansion valve is determined based on the target superheat, and further compensation is needed according to the N cold plate measured data, so that the outlet pressure of the N battery cold plates fluctuates less after compensation, and further the opening degree of the N electronic expansion valves fluctuates less, thereby ensuring the stability and control accuracy of the battery refrigeration control.

[0076] The target compensation value refers to the opening degree value of the to-be-compensated expansion valve determined according to the N cold plate measured data.

[0077] As an example, in step S203, the controller can determine that, in the current scenario, only according to the target superheat to control the opening degree of the electronic expansion valve can greatly cause the outlet pressure of the N battery cold plates to fluctuate greatly, and then cause the opening degree of the N electronic expansion valves to fluctuate greatly, so compensation control is needed, and at this time, M electronic expansion valves to be compensated can be determined from the N electronic expansion valves. In this example, 1≤M≤N, that is, in the case where the battery refrigeration control system includes N electronic expansion valves, all electronic expansion valves can be determined as electronic expansion valves to be compensated (M=N), or part of the electronic expansion valves can be determined as electronic expansion valves to be compensated (1≤M<N).

[0078] As an example, in step S204, after determining the M electronic expansion valves to be compensated, the controller can determine the preset opening degree as the target compensation value corresponding to the electronic expansion valve to be compensated, or can calculate and determine the target compensation value corresponding to the electronic expansion valve to be compensated according to the cold plate measured data of the electronic expansion valve to be compensated. Generally speaking, the greater the pressure and / or temperature of the battery cold plate, the greater the opening degree of the corresponding electronic expansion valve to be compensated, and the target compensation value can be determined as an increased compensation value; on the contrary, if the pressure and / or temperature of the battery cold plate is smaller, the opening degree of the corresponding electronic expansion valve to be compensated needs to be reduced, and the target compensation value can be determined as a reduced compensation value.

[0079] In this example, after calculating the target compensation values corresponding to the M electronic expansion valves to be compensated, the controller can first determine the original opening degree corresponding to the electronic expansion valve to be compensated according to the target superheat of the battery cold plate; and then compensates the original opening degree with the target compensation value to obtain the target opening degree of the electronic expansion valve to be compensated, so as to achieve the purpose of compensation control using the N cold plate measured data. The original opening degree here is the opening degree determined according to the target superheat. The target opening degree refers to the opening degree adjusted by the original opening degree with the target compensation value.

[0080] As an example, in step S205, after determining the target opening degree of each electronic expansion valve to be compensated, the controller can control the electronic expansion valve to be compensated according to the target opening degree, so that the opening degree of the electronic expansion valve to be compensated reaches the target opening degree, and the outlet pressure of the N battery cold plates after compensation fluctuates less, and the opening degree of the N electronic expansion valves can be prevented from fluctuating greatly, so as to achieve the purpose of ensuring the stability and control accuracy of the battery refrigeration control.

[0081] In this example, when the N battery cold plate measured data does not meet the target compensation condition, it can be determined that the outlet pressure fluctuation of the N battery cold plate is small, at this time, the opening fluctuation of the N electronic expansion valve is small, and compensation control is not required. According to the target superheat degree of the battery cold plate in each cold plate control loop, the opening of the electronic expansion valve is controlled, and the opening of each electronic expansion valve is controlled to reach the original opening according to the target superheat degree of each battery cold plate.

[0082] In this example, the controller determines M to-be-compensated expansion valves from the N electronic expansion valves, and for the remaining N-M electronic expansion valves, i.e. the remaining N-M electronic expansion valves that do not require compensation control, the opening of the electronic expansion valve is controlled according to the target superheat degree of the battery cold plate in each cold plate control loop, and the original opening of the electronic expansion valve is determined according to the target superheat degree of each battery cold plate, and the opening of each electronic expansion valve is controlled to reach the original opening.

[0083] In this embodiment, when the cold plate measured data of the N battery cold plates meets the target compensation condition, it can be determined that the outlet pressure fluctuation of the N battery cold plates is large, which will cause the opening fluctuation of the N electronic expansion valves to be large. Therefore, the N cold plate measured data needs to be further analyzed to determine M to-be-compensated expansion valves and their corresponding target compensation values from the N battery cold plates. Then, the target opening of the to-be-compensated expansion valve is determined according to the target compensation value and the target superheat degree corresponding to each to-be-compensated expansion valve, and the to-be-compensated expansion valve is controlled to work, so as to achieve the purpose of ensuring the stability and control precision of the battery refrigeration control.

[0084] In an embodiment, as shown in Figure 3 Step S202, i.e. determining whether the target compensation condition is met according to the cold plate measured data corresponding to the N battery cold plates, includes:

[0085] S301: Obtain a first target difference value according to the first cold plate data corresponding to the upper layer cold plate and the second cold plate data corresponding to the lower layer cold plate;

[0086] S302: If the first target difference value is outside the first compensation threshold range, it is determined that the target compensation condition is met;

[0087] S303: If the first target difference value is within the first compensation threshold range, it is determined that the target compensation condition is not met.

[0088] The upper and lower cold plates refer to two battery cold plates stacked in an upper and lower arrangement. The first cold plate data refers to measured data related to the upper cold plate collected in real time. As an example, the first cold plate data can include, but is not limited to, a first cold plate pressure and / or a first cold plate temperature corresponding to the upper cold plate. The second cold plate data refers to measured data related to the lower cold plate collected in real time. As an example, the second cold plate data can include, but is not limited to, a second cold plate pressure and / or a second cold plate temperature corresponding to the lower cold plate.

[0089] As an example, in step S301, when two cold plate control loops are provided on the battery refrigeration control system (i.e., N = 2), the cold plate measured data corresponding to the N battery cold plates obtained by the controller includes the first cold plate data corresponding to the upper cold plate and the second cold plate data corresponding to the lower cold plate. When determining whether the target compensation condition is met, the controller can perform a difference calculation on the first cold plate data corresponding to the upper cold plate and the second cold plate data corresponding to the lower cold plate, and determine the difference between the two as a first target difference, i.e., the first target difference = the first cold plate data - the second cold plate data. Understandably, since the first target difference is the difference between the first cold plate data corresponding to the upper cold plate and the second cold plate data corresponding to the lower cold plate, it can directly reflect the environmental difference between the upper and lower cold plates, so as to evaluate whether it is necessary to compensate the opening of the corresponding electronic expansion valve using the first target difference.

[0090] The first compensation threshold range is a first compensation threshold range set in advance, and the compensation threshold range is a threshold range for evaluating whether the difference is large enough to determine whether compensation control is necessary. For example, the first compensation threshold range includes a first upper threshold and a first lower threshold, where the first upper threshold is a larger value defined in the first compensation threshold range, and the first lower threshold is a smaller value defined in the first compensation threshold range. In this example, the determination of the first compensation threshold range is related to the refrigerant of the battery refrigeration control system.

[0091] As an example, in step S302, after calculating the first target difference, the controller can compare the first target difference with the first compensation threshold range set in advance. If the first target difference is outside the first compensation threshold range, i.e., the first target difference is greater than the first upper threshold or the first target difference is less than the first lower threshold, it is determined that the environmental difference between the first cold plate data corresponding to the upper cold plate and the second cold plate data corresponding to the lower cold plate is large. If compensation control is not performed, it is highly likely that the outlet pressure fluctuation between the upper and lower cold plates will be large, which in turn will cause the opening of the N electronic expansion valves to fluctuate greatly, affecting the stability and control accuracy of the battery refrigeration control. Therefore, it is determined that the target compensation condition is met, and subsequent compensation control operation is required.

[0092] As an example, in step S303, after the controller calculates the first target difference, it can compare the first target difference with a preset first compensation threshold range. If the first target difference is within the first compensation threshold range, that is, the first target difference is not greater than the first upper limit threshold and not less than the first lower limit threshold, it is determined that the environmental difference between the first cold plate data corresponding to the upper cold plate and the second cold plate data corresponding to the lower cold plate is small. The stability and control accuracy of the battery cooling control can be guaranteed without compensation control. Therefore, it can be determined that the target compensation condition is not met and no subsequent compensation control operation is required.

[0093] In this embodiment, the difference between the first cold plate data and the second cold plate data is calculated to determine the first target difference. The first target difference is compared with the first compensation threshold range. Based on the comparison result, it is evaluated whether the environmental difference between the upper cold plate and the lower cold plate reaches the standard of large difference, so as to determine whether the target compensation condition is met. Then, subsequent compensation control operations are performed to ensure the stability and control accuracy of battery cooling control.

[0094] In one embodiment, such as Figure 4 As shown, step S203, which involves determining M expansion valves to be compensated from N electronic expansion valves, includes:

[0095] S401: The electronic expansion valve corresponding to the larger value between the first cold plate data and the second cold plate data is identified as the expansion valve to be added;

[0096] S402: The electronic expansion valve corresponding to the smaller value between the first cold plate data and the second cold plate data is identified as the expansion valve to be reduced.

[0097] As an example, in a battery cooling control system with two cold plate control loops (i.e., N=2), when the first target difference between the data of the first cold plate corresponding to the upper cold plate and the data of the second cold plate corresponding to the lower cold plate is outside the first compensation threshold range, and the target compensation condition is met—that is, when it is confirmed that the outlet pressure of the upper and lower cold plates is relatively large, which may cause large fluctuations in the opening of the two electronic expansion valves—the controller will further compare the magnitudes of the first and second cold plate data. The electronic expansion valve corresponding to the larger value of the first and second cold plate data will be identified as the expansion valve to be increased, and the electronic expansion valve corresponding to the smaller value of the first and second cold plate data will be identified as the expansion valve to be decreased. This allows for subsequent compensation by increasing the opening of the expansion valve to be increased and decreasing the opening of the expansion valve to be decreased. The expansion valves to be compensated include the expansion valve to be increased and the expansion valve to be decreased.

[0098] In this embodiment, the sizes of the first cold plate data and the second cold plate data are compared, and the larger value of the two can reflect that the outlet pressure of the battery cold plate corresponding to the larger value is larger in the current scenario, and the opening of the electronic expansion valve thereof needs to be increased to reduce the outlet pressure of the battery cold plate. Therefore, the electronic expansion valve corresponding to the larger value is determined as the to-be-increased expansion valve. Conversely, the smaller value of the two can reflect that the outlet pressure of the battery cold plate corresponding to the smaller value is smaller in the current scenario, and the opening of the electronic expansion valve thereof needs to be reduced to increase the outlet pressure of the battery cold plate. Therefore, the electronic expansion valve corresponding to the smaller value is determined as the to-be-decreased expansion valve.

[0099] In an embodiment, as shown in FIG. 2, step S202, i.e., determining whether the target compensation condition is met according to the cold plate measured data corresponding to the N battery cold plates, comprises: Figure 5

[0100] S501: obtaining a measured data mean value according to the cold plate measured data corresponding to the N battery cold plates;

[0101] S502: determining a second target difference value corresponding to the N battery cold plates according to the cold plate measured data corresponding to the N battery cold plates and the measured data mean value;

[0102] S503: if the second target difference value corresponding to at least one battery cold plate is outside the second compensation threshold range, it is determined that the target compensation condition is met;

[0103] S504: if the second target difference values corresponding to the N battery cold plates are all within the second compensation threshold range, it is determined that the target compensation condition is not met.

[0104] As an example, in step S501, when at least three cold plate control loops (i.e., N≥3) are provided on the battery refrigeration control system, the controller can obtain the cold plate measured data corresponding to the N battery cold plates collected by the target sensor in real time, and then perform mean value calculation on the cold plate measured data corresponding to the N battery cold plates to obtain the measured data mean value.

[0105] As an example, in step S502, after obtaining the measured data mean value corresponding to the N cold plate measured data, the controller can perform difference calculation on the cold plate measured data corresponding to each battery cold plate and the measured data mean value, and determine the difference value between the two as the second target difference value, i.e., the second target difference value=cold plate measured data-measured data mean value. Understandably, since the second target difference value is the difference value between the cold plate measured data corresponding to each battery cold plate and the measured data mean value, it can intuitively reflect the degree of deviation of each battery cold plate from the measured data mean value corresponding to the N battery cold plates, so as to evaluate whether it is necessary to perform compensation control on the opening of the electronic expansion valve by using the second target difference value.

[0106] ​The second compensation threshold range is a second compensation threshold range preset in advance, and is a threshold range for evaluating whether the difference is large enough to determine whether compensation control is necessary. In this example, the second compensation threshold range can be the same as or different from the first compensation threshold range. In this example, the determination of the second compensation threshold range is related to the refrigerant of the battery refrigeration control system.

[0107] As an example, in step S503, after calculating the second target difference, the controller compares the second target difference corresponding to each battery cold plate with the preset second compensation threshold range. If the second target difference corresponding to at least one battery cold plate is outside the second compensation threshold range, it is determined that the measured data of the cold plate corresponding to at least one battery cold plate deviates from the mean value of the measured data to a large extent. If compensation control is not performed, the outlet pressure of at least one battery cold plate will be significantly different from the outlet pressure of other battery cold plates, resulting in a large fluctuation in the opening degree between at least two electronic expansion valves, which affects the stability and control accuracy of the battery refrigeration control. Therefore, it can be determined that the target compensation condition is met, and subsequent compensation control operation needs to be performed.

[0108] As an example, in step S504, after calculating the second target difference, the controller compares the second target difference corresponding to each battery cold plate with the preset second compensation threshold range. If the second target difference corresponding to all battery cold plates is within the second compensation threshold range, it is determined that the measured data of the cold plate corresponding to all battery cold plates deviates from the mean value of the measured data to a small extent. Compensation control is not needed to ensure the stability and control accuracy of the battery refrigeration control. Therefore, it can be determined that the target compensation condition is not met, and subsequent compensation control operation is not needed.

[0109] In this embodiment, the mean value of the measured data is first determined according to N measured data, and then N second target differences are determined according to the measured data of the cold plate corresponding to each battery cold plate and the mean value of the measured data. The N second target differences are compared with the second compensation threshold range respectively, the degree to which the measured data of the cold plate deviates from the mean value of the measured data is determined according to the comparison result, and then it is evaluated whether the target compensation condition is met, and then the subsequent compensation control operation is performed, so as to achieve the purpose of ensuring the stability and control accuracy of the battery refrigeration control.

[0110] In an embodiment, as shown in FIG. 2, step S203, i.e., determining M to-be-compensated expansion valves from N electronic expansion valves, includes: Figure 6

[0111] S601: determining the electronic expansion valve with the second target difference outside the second compensation threshold range as a target expansion valve;

[0112] ​S602: Determine the target expansion valve as the expansion valve to be increased, if the measured data of the cold plate corresponding to the target expansion valve is greater than the average of the measured data.

[0113] S602: Determine the target expansion valve as the expansion valve to be decreased, if the measured data of the cold plate corresponding to the target expansion valve is less than the average of the measured data.

[0114] As an example, when there are at least three cold plate control loops (i.e., N≥3) in the battery refrigeration control system, if the second target difference between the measured data of any battery cold plate and the average of the measured data is outside the second compensation threshold range, i.e., the target compensation condition is met, the electronic expansion valve corresponding to the second target difference is determined as the target expansion valve. After determining the expansion valve to be compensated, the measured data of the cold plate corresponding to the expansion valve to be compensated is compared with the average of the measured data. If the measured data of the cold plate corresponding to the target expansion valve is greater than the average of the measured data, the target expansion valve is determined as the expansion valve to be increased. If the measured data of the cold plate corresponding to the target expansion valve is less than the average of the measured data, the target expansion valve is determined as the expansion valve to be decreased. The expansion valve to be compensated includes the expansion valve to be increased and the expansion valve to be decreased.

[0115] In this embodiment, when the second target difference between the measured data of each battery cold plate and the average of the measured data is outside the second compensation threshold range, the electronic expansion valve corresponding to the second target difference is determined as the target expansion valve. Then, the measured data of each target expansion valve is compared with the average of the measured data to determine whether the opening of the target expansion valve needs to be increased or decreased, so as to determine the expansion valve to be increased or the expansion valve to be decreased. Subsequently, the opening of the expansion valve to be increased or the expansion valve to be decreased is increased or decreased, respectively, so as to achieve the purpose of reducing the fluctuation of the opening of the N electronic expansion valves and further ensuring the stability and control accuracy of the battery refrigeration control.

[0116] In an embodiment, as shown in FIG. 2, step S202, i.e., determining whether the target compensation condition is met according to the measured data of the N battery cold plates, includes: Figure 7

[0117] S701: Calculate the difference between any two of the measured data of the N battery cold plates to obtain N-1 third target differences.

[0118] S702: If at least one of the third target differences is outside the third compensation threshold range, it is determined that the target compensation condition is met.

[0119] S703: If all the N-1 third target differences are within the third compensation threshold range, it is determined that the target compensation condition is not met.

[0120] ​As an example, in step S701, when there are at least three cold plate control loops (i.e., N≥3) in the battery refrigeration control system, the controller can obtain the cold plate measured data corresponding to the N battery cold plates collected by the target sensor in real time, and then perform difference calculation on any two of the cold plate measured data corresponding to the N battery cold plates to obtain N-1 third target differences. Understandably, the third target difference can reflect the environmental difference between any two battery cold plates, so as to evaluate whether it is necessary to perform compensation control on the opening of the corresponding electronic expansion valve by using the third target difference.

[0121] The third compensation threshold range is a third compensation threshold range set in advance, and the compensation threshold range is a threshold range for evaluating whether the difference is large enough to determine whether compensation control is necessary. In the example, the third compensation threshold range can be the same as or different from the first and second compensation threshold ranges. In the example, the determination of the third compensation threshold range is related to the refrigerant of the battery refrigeration control system.

[0122] As an example, in step S702, after calculating the third target difference corresponding to any two battery cold plates, the controller can compare any one third target difference with the third compensation threshold range set in advance. If at least one third target difference is outside the third compensation threshold range, it is determined that the difference between the cold plate measured data corresponding to any two battery cold plates is large, and if compensation control is not performed, the outlet pressure difference of the two battery cold plates will be large, which will further cause the opening of at least two electronic expansion valves to fluctuate greatly, affecting the stability and control accuracy of the battery refrigeration control. Therefore, it can be determined that the target compensation condition is met, and subsequent compensation control operation is required.

[0123] As an example, in step S703, after calculating the third target difference corresponding to any two battery cold plates, the controller can compare any one third target difference with the third compensation threshold range set in advance. If the N-1 third target differences are all within the third compensation threshold range, it is determined that the difference between the cold plate measured data corresponding to any two battery cold plates is small, and compensation control is not required to ensure the stability and control accuracy of the battery refrigeration control. Therefore, it can be determined that the target compensation condition is not met, and subsequent compensation control operation is not required.

[0124] In the embodiment, the cold plate measured data of any two battery cold plates is subjected to difference calculation to determine the third target difference, the third target difference is compared with the third compensation threshold range, and according to the comparison result, it is determined whether the environmental difference between any two battery cold plates reaches the large difference standard to determine whether the target compensation condition is met, and then the subsequent compensation control operation is performed to achieve the purpose of ensuring the stability and control accuracy of the battery refrigeration control.

[0125] In an embodiment, as shown in FIG. 2, step S203, i.e., determining M electronic expansion valves to be compensated from N electronic expansion valves, comprises: Figure 8

[0126] S801: determining all third target differences outside the third compensation threshold range as to-be-analyzed differences;

[0127] S802: according to the order from large to small of all to-be-analyzed differences, determining the electronic expansion valve corresponding to the larger value of the two cold plate measured data corresponding to the to-be-analyzed difference as a to-be-increased expansion valve, and determining the electronic expansion valve corresponding to the smaller value of the two cold plate measured data corresponding to the to-be-analyzed difference as a to-be-decreased expansion valve.

[0128] As an example, when at least three cold plate control loops (i.e., N≥3) are provided on the battery refrigeration control system, the difference between any two cold plate measured data is calculated to obtain N-1 third target differences. When at least one third target difference is outside the third compensation threshold range, it is determined that the target compensation condition is met, i.e., at least two battery cold plates have relatively large outlet pressure, and at least two electronic expansion valves have relatively large opening fluctuation. In this case, the controller further determines all third target differences outside the third compensation threshold range as to-be-analyzed differences. Then, the controller further compares the sizes of all to-be-analyzed differences, determines the order from large to small of all to-be-analyzed differences, and then determines the electronic expansion valve corresponding to the larger value of the two cold plate measured data corresponding to the to-be-analyzed difference as a to-be-increased expansion valve, and determines the electronic expansion valve corresponding to the smaller value of the two cold plate measured data corresponding to the to-be-analyzed difference as a to-be-decreased expansion valve.

[0129] For example, it is determined that two third target differences are outside the third compensation threshold range. In this case, both of the two third target differences can be determined as to-be-analyzed differences, and the two to-be-analyzed differences are sorted from large to small to determine the order from large to small of the two to-be-analyzed differences, i.e., to-be-analyzed difference A is greater than to-be-analyzed difference B. Then, the electronic expansion valve corresponding to the larger value of the two cold plate measured data corresponding to to-be-analyzed difference A is determined as a to-be-increased expansion valve, and the electronic expansion valve corresponding to the smaller value of the two cold plate measured data corresponding to to-be-analyzed difference A is determined as a to-be-decreased expansion valve. The opening of the to-be-increased expansion valve and the to-be-decreased expansion valve corresponding to to-be-analyzed difference A is adjusted first. After the opening of the two to-be-compensated expansion valves corresponding to to-be-analyzed difference A is adjusted, the electronic expansion valve corresponding to the larger value of the two cold plate measured data corresponding to to-be-analyzed difference B is determined as a to-be-increased expansion valve, and the electronic expansion valve corresponding to the smaller value of the two cold plate measured data corresponding to to-be-analyzed difference B is determined as a to-be-decreased expansion valve. The opening of the to-be-increased expansion valve and the to-be-decreased expansion valve corresponding to to-be-analyzed difference B is adjusted.

[0130] ​In the embodiment, when the third target difference determined by the cold plate measured data corresponding to any two battery cold plates is out of the third compensation threshold range, the third target difference is determined as a to-be-analyzed difference value; then, according to the order from large to small of all to-be-analyzed difference values, the sizes of the two cold plate measured data corresponding to each to-be-analyzed difference value are compared, and the larger value of the two can reflect that the outlet pressure of the battery cold plate corresponding to the larger value is larger under the current scene, and the outlet pressure of the battery cold plate needs to be reduced by increasing the opening of the electronic expansion valve corresponding to the larger value. Therefore, the electronic expansion valve corresponding to the larger value is determined as a to-be-increased expansion valve. Conversely, the smaller value of the two can reflect that the outlet pressure of the battery cold plate corresponding to the smaller value is smaller under the current scene, and the outlet pressure of the battery cold plate needs to be increased by reducing the opening of the electronic expansion valve corresponding to the smaller value. Therefore, the electronic expansion valve corresponding to the smaller value is determined as a to-be-decreased expansion valve. Understandably, since the third target difference is the difference of any two cold plate measured data, if the number of third target differences out of the third compensation threshold range is at least two, the any two battery cold plates corresponding to the at least two third target differences may overlap. At this time, according to the order from large to small of all to-be-analyzed difference values, the two electronic expansion valves corresponding to each to-be-analyzed difference value are determined as the to-be-increased expansion valve and the to-be-decreased expansion valve respectively and compensation control is performed, which can realize the linkage adjustment of other third target differences and achieve the purpose of compensation control.

[0131] In an embodiment, as shown in FIG. 2A, step S202, i.e., determining whether the target compensation condition is met according to the cold plate measured data corresponding to the N battery cold plates, includes: Figure 9

[0132] S901: obtaining a pressure evaluation result according to the cold plate measured pressure corresponding to the N battery cold plates and the target pressure threshold range;

[0133] S902: obtaining a temperature evaluation result according to the cold plate measured temperature corresponding to the N battery cold plates and the target temperature threshold range;

[0134] S903: if at least one of the pressure evaluation result and the temperature evaluation result is a compensation control needed, it is determined that the target compensation condition is met;

[0135] S904: if the pressure evaluation result and the temperature evaluation result are both compensation control not needed, it is determined that the target compensation condition is not met.

[0136] ​As an example, the cold plate measured data corresponding to the N battery cold plates acquired by the controller includes cold plate measured pressure and / or cold plate measured temperature. The cold plate measured pressure is the pressure measured in real time in the battery cold plate, which can be the cold plate measured pressure collected in real time by the pressure sensor arranged at the corresponding position of the battery cold plate. The target pressure threshold range refers to a range set in advance for evaluating whether the cold plate measured pressure reaches the compensation control standard.

[0137] As an example, in step S901, after acquiring the cold plate measured pressure corresponding to the N battery cold plates, the controller can calculate the target pressure difference value according to the N cold plate measured pressures, and then compare the target pressure difference value with the preset target pressure threshold range. If the target pressure difference value is outside the target pressure threshold range, it means that there are at least two battery cold plates with large differences in cold plate measured pressure, and if no compensation control is performed, it will cause large fluctuations in the opening degree of the corresponding electronic expansion valve, affecting the stability and control accuracy of the battery refrigeration control. At this time, the pressure evaluation result that needs compensation control is acquired. If the target pressure difference value is outside the target pressure threshold range, it means that there are no at least two battery cold plates with large differences in cold plate measured pressure. At this time, the pressure evaluation result that does not need compensation control can be acquired.

[0138] For example, the target pressure threshold range is a first pressure threshold range, which is a first pressure threshold range set in advance, for example, it can be set as [-0.7Mbar, 0.7Mbar]. When N=2, the N cold plate measured pressures corresponding to the N battery cold plates acquired by the controller include the first cold plate pressure corresponding to the upper layer cold plate and the second cold plate pressure corresponding to the lower layer cold plate. In the pressure evaluation process, the controller can first calculate the difference between the first cold plate pressure corresponding to the upper layer cold plate and the second cold plate pressure corresponding to the lower layer cold plate to obtain a first pressure difference value; then, compare the first pressure difference value with the first pressure threshold range; if the first pressure difference value is outside the first pressure threshold range, it is determined that the pressure difference between the upper layer cold plate and the lower layer cold plate is large, which is likely to cause large fluctuations in the outlet pressure between the upper layer cold plate and the lower layer cold plate, and thus cause large fluctuations in the opening degree of the two electronic expansion valves. Therefore, the pressure evaluation result that needs compensation control can be acquired; if the first pressure difference value is within the first pressure threshold range, it is determined that the pressure difference between the upper layer cold plate and the lower layer cold plate is small, and the pressure evaluation result that does not need compensation control can be acquired.

[0139] For example, the target pressure threshold range is a second pressure threshold range, which is a pre-set second pressure threshold range and can be the same as or different from the first pressure threshold range. During the pressure evaluation process, after obtaining the measured pressure of the cold plates corresponding to N battery cold plates, the controller can calculate the average of the N measured pressures to obtain the average cold plate pressure. Then, the controller compares the measured pressure of each battery cold plate with the average cold plate pressure.

[0140] Calculate the difference to obtain the second pressure difference value corresponding to each battery cold plate; compare the second pressure difference value corresponding to each battery cold plate with the second pressure threshold range; if at least one battery cold plate has a second pressure difference value corresponding to the second pressure threshold range, then...

[0141] If the pressure is outside the force threshold range, it is determined that the measured pressure of at least one battery cold plate deviates significantly from the average pressure of the cold plate. This is very likely to cause the outlet pressure of at least one battery cold plate to differ significantly from the outlet pressure of other battery cold plates, which in turn leads to a large fluctuation in the opening of at least one electronic expansion valve. Therefore, the pressure assessment results that require compensation control can be obtained.

[0142] If all second pressure differences are within the second pressure threshold range, it is determined that the measured pressure of all battery cold plates deviates little from the average cold plate pressure of 0, and pressure assessment results without compensation control can be obtained.

[0143] For example, the target pressure threshold range is a third pressure threshold range, which is a pre-set third pressure threshold range. This third pressure threshold range can be the same as or different from the first and second pressure threshold ranges. During the pressure evaluation process, after obtaining the measured pressure of the cold plates corresponding to N battery cold plates, the controller applies pressure to the N battery cold plates.

[0144] The controller calculates the difference between any two of the measured pressures on the corresponding cold plate to obtain N-1 third pressure difference values. Then, the controller compares each of the N third pressure difference values ​​with a third pressure threshold range; if at least one third pressure difference value is found to be false, the controller will take further action.

[0145] If the pressure difference is outside the third pressure threshold range, it is determined that there is a large difference in the measured pressure of any two battery cold plates. Therefore, a pressure assessment result requiring compensation control can be obtained. If all third pressure differences are within the third pressure threshold range, it is determined that the difference in the measured data of any two battery cold plates is small. A pressure assessment result requiring no compensation control can be obtained.

[0146] As an example, in step S902, after the controller obtains the measured temperatures of the cold plates corresponding to the N battery cold plates, it can...

[0147] The target temperature difference is calculated based on the measured temperatures of N cold plates, and then compared with a preset target temperature threshold range. If the target temperature difference is outside the target temperature threshold range, it indicates that at least two battery cold plates have significantly different measured temperatures. Since the temperature and pressure of the battery cold plates are directly proportional in the cold plate control loop, at least two...

[0148] The greater the measured temperature difference of the battery cold plate, the greater the fluctuation in the outlet pressure of the corresponding battery cold plate, which in turn leads to a greater fluctuation in the opening degree of the corresponding 5-electro-expansion valve. This affects the stability and accuracy of the battery cooling control, thus requiring compensation.

[0149] The controlled temperature assessment results; if the target temperature difference is outside the target temperature threshold range, it indicates that there is no battery cold plate with a large difference in the measured temperature of the cold plate. In this case, the temperature assessment results that do not require compensation control can be obtained.

[0150] For example, the target temperature threshold range is a first temperature threshold range, which is a preset first temperature threshold range.

[0151] A temperature threshold range. When N=2, the controller acquires the measured temperatures of the N battery cold plates, including the temperature of the first cold plate corresponding to the upper cold plate (0) and the temperature of the second cold plate corresponding to the lower cold plate. During temperature evaluation, the controller first calculates the difference between the temperatures of the first cold plate corresponding to the upper cold plate and the second cold plate corresponding to the lower cold plate to obtain a first temperature difference. Then, it compares the first temperature difference with a first temperature threshold range. If the first temperature difference is outside the first temperature threshold range, it is considered that the temperature difference between the upper and lower cold plates is large, which is very likely to cause large fluctuations in the outlet pressure between the upper and lower cold plates, and consequently, large fluctuations in the opening of the two electronic expansion valves. Therefore, a temperature evaluation result requiring compensation control can be obtained. If the first temperature difference is within the first temperature threshold range, it is considered that the temperature difference between the upper and lower cold plates is small, and a temperature evaluation result requiring no compensation control can be obtained.

[0152] For example, the target temperature threshold range is a second temperature threshold range, which is a second preset temperature threshold range, and can be the same as or different from the first temperature threshold range. In the temperature evaluation process, after obtaining the N battery cold plate measured temperatures, the controller can calculate the average of the N battery cold plate measured temperatures to obtain a cold plate temperature average. Then, the controller can calculate the difference between each battery cold plate measured temperature and the cold plate temperature average to obtain a second temperature difference value corresponding to each battery cold plate. The second temperature difference value corresponding to each battery cold plate is compared with the second temperature threshold range. If at least one second temperature difference value corresponding to a battery cold plate is outside the second temperature threshold range, it is determined that the degree of deviation of the battery cold plate measured temperature from the cold plate temperature average is large, and it is very likely to cause a large difference between the outlet pressure of at least one battery cold plate and the outlet pressure of other battery cold plates, thereby causing a large fluctuation in the opening degree of at least one electronic expansion valve. Therefore, a temperature evaluation result requiring compensation control can be obtained. If all second temperature difference values are within the second temperature threshold range, it is determined that the degree of deviation of the battery cold plate measured temperature from the cold plate temperature average is small, and a temperature evaluation result requiring no compensation control can be obtained.

[0153] For another example, the target temperature threshold range is a third temperature threshold range, which is a third preset temperature threshold range, and can be the same as or different from the first temperature threshold range and the second temperature threshold range. In the temperature evaluation process, after obtaining the N battery cold plate measured temperatures, the controller can calculate the difference between any two of the N battery cold plate measured temperatures to obtain N-1 third temperature difference values. Then, the controller can compare the N third temperature difference values with the third temperature threshold range respectively. If at least one third temperature difference value is outside the third temperature threshold range, it is determined that the difference between the battery cold plate measured temperatures of any two battery cold plates is large, and a temperature evaluation result requiring compensation control can be obtained. If all third temperature difference values are within the third temperature threshold range, it is determined that the difference between the battery cold plate measured data of any two battery cold plates is small, and a temperature evaluation result requiring no compensation control can be obtained.

[0154] As an example, in step S903, when at least one of the pressure evaluation result and the temperature evaluation result is a result requiring compensation control, it is determined that, according to the cold plate measured pressure and / or the cold plate measured temperature, it is determined that there are at least two battery cold plates with large outlet pressure fluctuations in the current scenario, which will cause a large fluctuation in the opening degree of the corresponding electronic expansion valve, affecting the stability and control accuracy of the battery refrigeration control. Therefore, it is determined that the target compensation condition is met, so as to subsequently perform compensation control.

[0155] As an example, in step S904, when the pressure evaluation result and the temperature evaluation result are both no compensation control, it can be determined that according to the cold plate measured pressure and the cold plate measured temperature, it can be determined that there is no at least two battery cold plates with large outlet pressure fluctuation in the current scene, and there is no problem of large electronic expansion valve opening fluctuation, therefore, it can be determined that the target compensation condition is not met, and no compensation control is needed.

[0156] In this embodiment, the cold plate measured pressure and the cold plate measured temperature corresponding to the battery cold plate are used to comprehensively evaluate whether compensation control is needed, and the pressure evaluation result and the temperature evaluation result are determined respectively, and then the pressure evaluation result and the temperature evaluation result are used to comprehensively evaluate whether the target compensation condition is met, so as to ensure the accuracy of the target compensation condition evaluation, and to achieve the purpose of ensuring the stability and control precision of the battery refrigeration control.

[0157] In an embodiment, as Figure 10 , step S204, obtaining the target compensation value corresponding to the compensation expansion valve, determining the target opening degree of the compensation expansion valve according to the target superheat degree and the target compensation value corresponding to the battery cold plate, comprising:

[0158] S1002: determining the original opening degree corresponding to the compensation expansion valve according to the target superheat degree corresponding to the battery cold plate;

[0159] S1002: if the compensation expansion valve is the to-be-increased expansion valve, obtaining the to-be-increased compensation value corresponding to the compensation expansion valve, and determining the target opening degree of the compensation expansion valve according to the original opening degree and the to-be-increased compensation value;

[0160] S1003: if the compensation expansion valve is the to-be-decreased expansion valve, obtaining the to-be-decreased compensation value corresponding to the compensation expansion valve, and determining the target opening degree of the compensation expansion valve according to the original opening degree and the to-be-decreased compensation value.

[0161] As an example, in step S1001, the controller can determine the original opening degree of the compensation expansion valve according to the target superheat degree corresponding to the battery cold plate. For example, the controller can query the pre-set superheat degree opening degree table according to the target superheat degree of the compensation expansion valve to determine the original opening degree of the compensation expansion valve. Understandably, the process of determining the original opening degree according to the target superheat degree of the battery cold plate can also be determined by the prior art, which is not described here.

[0162] The to-be-increased compensation value refers to the opening degree value that needs to be increased.

[0163] As an example, in step S1002, when the controller determines that a certain to-be-compensated expansion valve is a to-be-increased expansion valve, the to-be-increased compensation value corresponding to the to-be-compensated expansion valve needs to be obtained, and the to-be-increased compensation value here is the target compensation value. For example, the preset opening value can be determined as the to-be-increased compensation value, or the to-be-increased compensation value can be calculated according to the measured data of the cold plate corresponding to the to-be-compensated expansion valve and the compensation threshold range corresponding thereto. Then, the controller can determine the target opening of the to-be-compensated expansion valve according to the original opening of the to-be-compensated expansion valve and the to-be-increased compensation value, and specifically, the sum of the original opening and the to-be-increased compensation value is determined as the target opening of the to-be-compensated expansion valve, so as to increase the opening of the to-be-increased expansion valve, thereby reducing the outlet pressure of the battery cold plate corresponding to the to-be-increased expansion valve, which helps to reduce the outlet pressure fluctuation of all battery cold plates, and further helps to reduce the opening fluctuation of all electronic expansion valves, so as to achieve the purpose of ensuring the stability and control precision of battery refrigeration control.

[0164] The to-be-decreased compensation value refers to the opening value that needs to be compensated by decreasing.

[0165] As an example, in step S1003, when the controller determines that a certain to-be-compensated expansion valve is a to-be-decreased expansion valve, the to-be-decreased compensation value corresponding to the to-be-compensated expansion valve needs to be obtained, for example, the preset opening value can be determined as the to-be-decreased compensation value, or the to-be-decreased compensation value can be calculated according to the measured data of the cold plate corresponding to the to-be-compensated expansion valve and the compensation threshold range corresponding thereto. Then, the controller can determine the target opening of the to-be-compensated expansion valve according to the original opening of the to-be-compensated expansion valve and the to-be-decreased compensation value, and specifically, the difference between the original opening and the to-be-decreased compensation value is determined as the target opening of the to-be-compensated expansion valve.

[0166] In this embodiment, after the original opening is determined according to the target superheat degree of the battery cold plate, when the to-be-compensated expansion valve is a to-be-increased expansion valve, the original opening is compensated by increasing the to-be-increased compensation value, so as to increase the opening of the to-be-increased expansion valve, thereby reducing the outlet pressure of the battery cold plate corresponding to the to-be-increased expansion valve; when the to-be-compensated expansion valve is a to-be-decreased expansion valve, the original opening is compensated by decreasing the to-be-decreased compensation value, so as to decrease the opening of the to-be-decreased expansion valve, thereby increasing the outlet pressure of the battery cold plate corresponding to the to-be-decreased expansion valve. Understandably, by increasing the opening of the to-be-increased expansion valve and decreasing the opening of the to-be-decreased expansion valve, the outlet pressure fluctuation of all battery cold plates is reduced, and further, the opening fluctuation of all electronic expansion valves is reduced, so as to achieve the purpose of ensuring the stability and control precision of battery refrigeration control.

[0167] In the battery cooling control method provided in this embodiment, when it is determined that the expansion valve to be compensated is an expansion valve to be increased or an expansion valve to be decreased, the battery cooling system can be adjusted by increasing the opening of the expansion valve to be increased and decreasing the opening of the expansion valve to be decreased. This allows the battery cooling system to quickly reach system pressure balance, thereby achieving precise system control and reducing the mutual influence between the multi-layer cold plate control loops. As a result, it can achieve both precise system control and reduced system matching time, saving vehicle development costs and shortening the vehicle development cycle.

[0168] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0169] In one embodiment, a controller is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the battery cooling control method described in the above embodiment, for example... Figure 2 As shown in S201-S205, or Figures 3 to 10 As shown in the figure, to avoid repetition, it will not be repeated here.

[0170] In one embodiment, a battery cooling control system is provided, including the aforementioned controller and N cold plate control loops, where N≥2; each cold plate control loop includes a battery cold plate, an electronic expansion valve, and a target sensor, and the controller is connected to the target sensor and the electronic expansion valve. In this example, the controller can receive real-time measured data of the cold plate collected by the target sensor and execute the battery cooling control method described in the above embodiment, for example... Figure 2 As shown in S201-S205, or Figures 3 to 10 As shown in the figure, to avoid repetition, it will not be repeated here.

[0171] In one embodiment, a vehicle is provided, including the battery cooling control system described above. The controller in this battery cooling control system is capable of executing the battery cooling control method described above, for example... Figure 2 As shown in S201-S205, or Figures 3 to 10 As shown in the figure, to avoid repetition, it will not be repeated here.

[0172] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware, and the computer program can be stored in a non-volatile computer-readable storage medium.

[0173] In the storage medium, when the computer program is executed, it may include the processes of the embodiments of the methods described above. Any references to memory, storage, database, or other media used in the embodiments provided in this application 5 may include...

[0174] Non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is used in multiple...

[0175] Various forms are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate 0 SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), Rambus Direct RAM (RDRAM), Direct Memory Bus Dynamic RAM (DRDRAM), and Memory Bus Dynamic RAM (RDRAM), etc.

[0176] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, only the above-mentioned functional units will be used.

[0177] The division of units and modules is illustrated with examples. In practical applications, the above functions can be assigned to different functional units or modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete the above tasks.

[0178] Describe all or part of the functionality.

[0179] The embodiments described above are merely illustrative of the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the foregoing embodiments can still be applied in various ways.

[0180] Modifications to the technical solutions described in the examples, or equivalent substitutions to some of the technical features, shall not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and shall all be included within the protection scope of the present invention.

Claims

1. A battery cooling control method, characterized in that, include: Obtain target data corresponding to N cold plate control loops. Each target data includes the target superheat corresponding to the battery cold plate and the measured data of the cold plate, where N≥2. Based on the measured data of the cold plates corresponding to the N battery cold plates, determine whether the target compensation condition is met. If the target compensation condition is met, then from the N electronic expansion valves, M expansion valves to be compensated are determined, where 1≤M≤N; Obtain the target compensation value corresponding to the expansion valve to be compensated, and determine the target opening degree of the expansion valve to be compensated based on the target superheat and target compensation value corresponding to the battery cold plate. The operation of the expansion valve to be compensated is controlled according to the target opening degree of the expansion valve to be compensated.

2. The battery cooling control method as described in claim 1, characterized in that, The step of determining whether the target compensation condition is met based on the measured data of the N battery cold plates includes: Based on the data of the first cold plate corresponding to the upper cold plate and the data of the second cold plate corresponding to the lower cold plate, obtain the first target difference. If the first target difference is outside the range of the first compensation threshold, then the target compensation condition is deemed to be met. If the first target difference is within the first compensation threshold, then the target compensation condition is not met.

3. The battery cooling control method as described in claim 2, characterized in that, The step of determining M expansion valves to be compensated from N electronic expansion valves includes: The electronic expansion valve corresponding to the larger value between the first cold plate data and the second cold plate data is identified as the expansion valve to be added. The electronic expansion valve corresponding to the smaller value between the first cold plate data and the second cold plate data is identified as the expansion valve to be reduced.

4. The battery cooling control method as described in claim 1, characterized in that, The step of determining whether the target compensation condition is met based on the measured data of the N battery cold plates includes: Based on the measured data of the N battery cold plates, the average of the measured data is obtained. Based on the measured data of N battery cold plates and the mean of the measured data, determine the second target difference for N battery cold plates; If the second target difference corresponding to at least one of the battery cold plates is outside the range of the second compensation threshold, then the target compensation condition is deemed to be met. If the second target difference corresponding to N battery cold plates is within the range of the second compensation threshold, then the target compensation condition is not met.

5. The battery cooling control method as described in claim 4, characterized in that, The step of determining M expansion valves to be compensated from N electronic expansion valves includes: Electronic expansion valves whose second target difference is outside the range of the second compensation threshold are identified as target expansion valves; The target expansion valve whose measured data of the cold plate is greater than the average value of the measured data is identified as the expansion valve to be added; The target expansion valve whose measured data of the cold plate is less than the average value of the measured data is identified as the expansion valve to be reduced.

6. The battery cooling control method as described in claim 1, characterized in that, The step of determining whether the target compensation condition is met based on the measured data of the N battery cold plates includes: Calculate the difference between any two of the measured data of the N battery cold plates to obtain N-1 third target differences; If at least one of the third target differences is outside the range of the third compensation threshold, then the target compensation condition is deemed to be met. If all N-1 of the third target differences are within the range of the third compensation threshold, then the target compensation condition is deemed not met.

7. The battery cooling control method as described in claim 6, characterized in that, The step of determining M expansion valves to be compensated from N electronic expansion valves includes: All the third target differences outside the range of the third compensation threshold are identified as differences to be analyzed. Based on the order of all the differences to be analyzed from largest to smallest, the electronic expansion valve corresponding to the larger value of the two cold plate measured data corresponding to the differences to be analyzed is determined as the expansion valve to be increased; the electronic expansion valve corresponding to the smaller value of the two cold plate measured data corresponding to the differences to be analyzed is determined as the expansion valve to be decreased.

8. The battery cooling control method according to any one of claims 1-7, characterized in that, The step of determining whether the target compensation condition is met based on the measured data of the N battery cold plates includes: Based on the measured pressure and target pressure threshold range of the N battery cold plates, the pressure evaluation results are obtained; Based on the measured temperature and target temperature threshold range of the N battery cold plates, the temperature evaluation results are obtained. If at least one of the pressure assessment results and the temperature assessment results indicates that compensation control is required, then the target compensation condition is deemed to be met. If both the pressure assessment result and the temperature assessment result indicate that no compensation control is required, then the target compensation condition is deemed not met.

9. The battery cooling control method as described in claim 3, 5, or 7, characterized in that, The step of obtaining the target compensation value corresponding to the expansion valve to be compensated, and determining the target opening degree of the expansion valve to be compensated based on the target superheat and target compensation value corresponding to the battery cold plate, includes: The original opening degree of the expansion valve to be compensated is determined based on the target superheat degree corresponding to the battery cold plate. If the expansion valve to be compensated is an expansion valve to be increased, then obtain the increase compensation value corresponding to the expansion valve to be compensated, and determine the target opening of the expansion valve to be compensated based on the original opening and the increase compensation value. If the expansion valve to be compensated is an expansion valve to be reduced, then obtain the reduction compensation value corresponding to the expansion valve to be compensated, and determine the target opening of the expansion valve to be compensated based on the original opening and the reduction compensation value.

10. A controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the battery cooling control method as described in any one of claims 1 to 9.

11. A battery cooling control system, characterized in that, It includes the controller as described in claim 10 and N cold plate control loops, where N ≥ 2; each cold plate control loop includes a battery cold plate, an electronic expansion valve, and a target sensor, and the controller is connected to the target sensor and the electronic expansion valve.

12. A car, characterized in that, Includes the battery cooling control system as described in claim 11.

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