Battery cooling method and system

Abstract

The embodiment of the present application relates to the technical field of electric vehicles, and particularly relates to a battery cooling method and system.The above method comprises the following steps: when it is detected that a first battery cell temperature is greater than a battery cell cooling threshold value, and a vehicle has an air conditioner refrigeration demand, obtaining a second battery cell temperature; if the second battery cell temperature is less than a battery cell limit threshold value, starting timing and performing battery primary cooling, comprising the following steps: determining a first opening value according to a timing time and an opening change period of an electronic valve; determining a first opening compensation value according to a difference between an actual refrigeration temperature and a target refrigeration temperature; determining a target opening of the electronic valve according to the first opening value and the first opening compensation value; and adjusting the opening of the electronic valve to the target opening to cool the battery.The present application effectively solves the problem of slow air conditioner refrigeration and poor effect when cooling the battery by periodically adjusting the opening of the electronic valve.

Description

[0001] Embodiments of the present application relate to the technical field of electric vehicles, and particularly relate to a battery cooling method and system.

[0002] Currently, new energy electric vehicles have two cooling needs, including air conditioning refrigeration needs and battery cooling needs. In related technologies, the refrigerant of an air conditioning refrigeration circuit is distributed to a battery cooling circuit to achieve battery cooling and ensure efficient operation of the battery.

[0003] A problem that follows is that when the air conditioner and the battery have refrigeration needs at the same time, if the refrigerant flow into the battery cooling circuit is too large, the refrigeration capacity of the air conditioner will be reduced, affecting user comfort.

[0004] Therefore, how to reasonably control the distribution of refrigerant flow of the air conditioning system and the battery side to meet the refrigeration needs of the air conditioner and the battery has become a problem to be solved.

[0005] Embodiments of the present application provide a battery cooling method and system, which periodically adjusts the opening degree of an electronic valve to make the refrigerant of an air conditioning refrigeration circuit flow into a battery cooler through the electronic valve and cool the battery.

[0006] In a first aspect, embodiments of the present application provide a battery cooling method, comprising:

[0007] When a first battery cell temperature is greater than a cell cooling threshold and a vehicle has air conditioning refrigeration needs, a second battery cell temperature of the battery is obtained;

[0008] If the second battery cell temperature is less than a cell limit threshold, a timing is started and a battery primary cooling is performed, wherein the battery primary cooling comprises:

[0009] A first opening degree value is determined according to a timing time and an opening degree change period of the electronic valve;

[0010] A first opening degree compensation value is determined according to a difference between an actual refrigeration temperature and a target refrigeration temperature of the air conditioning refrigeration circuit;

[0011] A target opening degree of the electronic valve is determined according to the first opening degree value and the first opening degree compensation value;

[0012] The opening degree of the electronic valve is adjusted to the target opening degree to make the refrigerant of the air conditioning refrigeration circuit flow into the battery cooler through the electronic valve and cool the battery.

[0013] In one possible implementation, the target opening degree of the electronic valve is determined according to the first opening degree value and the first opening degree compensation value, comprising:​​​

[0014] a first difference between the first opening degree value and the first opening degree compensation value as the target opening degree of the electronic valve.

[0015] In one possible implementation, the first difference between the first opening degree value and the first opening degree compensation value as the target opening degree of the electronic valve further includes:

[0016] If the first opening degree value is less than or equal to the first opening degree compensation value, the electronic valve is controlled to be closed, and the cooling of the battery is suspended.

[0017] In one possible implementation, the air conditioning refrigeration circuit includes a compressor, and the battery cooling circuit includes a battery liquid cooling plate, a water temperature sensor is connected to a battery water inlet of the battery liquid cooling plate, and is configured to acquire an actual temperature of the battery water inlet; the control module includes a first proportional-integral (PI) module, configured to determine a rotation speed of the compressor corresponding to a reduction of the actual temperature of the battery water inlet to a target temperature.

[0018] After the first cell temperature of the battery is detected to be greater than the cell cooling threshold value and the air conditioning refrigeration demand of the vehicle exists, the method further includes:

[0019] a second difference between the actual temperature of the battery water inlet and the target temperature is acquired in real time;

[0020] a first rotation speed of the compressor is determined by performing proportional-integral calculation on the second difference according to the first PI module.

[0021] a second rotation speed of the compressor is determined according to the target refrigeration temperature.

[0022] a sum of the first rotation speed and the second rotation speed is taken as a target rotation speed of the compressor.

[0023] The rotation speed of the compressor is adjusted to the target rotation speed, so that the battery is cooled by the refrigerant.

[0024] In one possible implementation, the battery cooler is provided with a refrigerant outlet, the refrigerant outlet is connected with a temperature and pressure sensor configured to acquire an actual outlet superheat of the battery cooler, and the control module includes a second PI module configured to determine an opening degree of the electronic valve corresponding to a reduction of the actual outlet superheat of the battery cooler to a target outlet superheat.

[0025] If the air conditioning cooling demand of the vehicle does not exist, or if the second cell temperature is greater than the limit temperature threshold value, a secondary battery cooling is performed.

[0026] The battery secondary cooling comprises:

[0027] A third difference value between the actual outlet superheat and the target outlet superheat is acquired in real time.

[0028] The third difference value is subjected to proportional integral calculation according to the second PI module, so as to determine a second opening degree of the electronic valve.

[0029] The opening degree of the electronic valve is adjusted to be the second opening degree, so that the refrigerant of the air conditioner refrigeration circuit flows into the battery cooler through the electronic valve to cool the battery until the actual outlet superheat reaches the target outlet superheat.

[0030] In one possible implementation, after the actual outlet superheat reaches the target outlet superheat, the method further comprises:

[0031] The opening degree of the electronic valve is controlled in a target opening degree range.

[0032] In one possible implementation, after the battery cooling, the method further comprises:

[0033] A third cell temperature of the battery is detected in real time, and it is determined whether the third cell temperature is less than or equal to a target cell temperature, the target cell temperature being determined according to the cell cooling threshold.

[0034] If the third cell temperature is less than or equal to the target cell temperature, the electronic valve is controlled to be closed, and the battery cooling is stopped.

[0035] In a second aspect, an embodiment of the present application provides a battery cooling system, comprising: an air conditioner refrigeration circuit, a battery cooling circuit and a control module; the air conditioner refrigeration circuit and the battery cooling circuit are both in communication with a battery cooler, and an electronic valve is arranged on a connection passage of the air conditioner refrigeration circuit and the battery cooler; the control module is configured to execute the battery cooling method as described in the first aspect.

[0036] In a third aspect, an embodiment of the present application provides an electronic device, comprising:

[0037] at least one processor; and

[0038] at least one memory in communication with the processor, wherein:

[0039] The memory stores program instructions executable by the processor, and the processor invoking the program instructions can execute the method as described in the first aspect.

[0040] In a fourth aspect, an embodiment of the present application provides a non-transitory computer-readable storage medium storing computer instructions, which cause the computer to perform the method of the first aspect.

[0041] The battery cooling method provided by the embodiment of the present application periodically adjusts the opening degree of the electronic valve to adjust the flow of refrigerant distributed to the battery cooler by the air conditioning refrigeration circuit when the vehicle has air conditioning refrigeration demand and battery cooling demand, thereby avoiding the problem of poor air conditioning refrigeration effect caused by a large opening degree of the electronic valve. BRIEF DESCRIPTION OF DRAWINGS

[0042] 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 embodiments. 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.

[0043] Figure 1 A structural schematic diagram of a battery cooling system provided by the embodiment of the present application is shown in FIG. 1.

[0044] Figure 2 A flowchart of a battery cooling method provided by the embodiment of the present application is shown in FIG. 2.

[0045] Figure 3 A schematic diagram of the change of the opening degree of the electronic valve with time provided by the embodiment of the present application is shown in FIG. 3.

[0046] Figure 4 A structural schematic diagram of another battery cooling system provided by the embodiment of the present application is shown in FIG. 4.

[0047] Figure 5 A flowchart of another battery cooling method provided by the embodiment of the present application is shown in FIG. 5.

[0048] Figure 6 A flowchart of a method for providing refrigerant by an air conditioning refrigeration circuit provided by the embodiment of the present application is shown in FIG. 6.

[0049] Figure 7 A structural schematic diagram of an electronic device provided by the embodiment of the present application is shown in FIG. 7.

DETAILED DESCRIPTION

[0050] In order to better understand the technical solutions of the embodiments of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0051] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0052] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0053] Figure 1 This is a schematic diagram of a battery cooling system provided in an embodiment of the present invention. The battery cooling system includes an air conditioning cooling circuit 1, a battery cooling circuit 2, and a control module 3.

[0054] The air conditioning cooling circuit 1 is specifically used to cool the passenger compartment inside the vehicle. Specifically, the air conditioning cooling circuit 1 may include a compressor 11 and an evaporator 12. When the vehicle requires air conditioning cooling, the compressor 11 and evaporator 12 are activated. The compressor 11 provides refrigerant to the air conditioning cooling circuit. After the refrigerant enters the evaporator 12, the evaporator temperature decreases, thereby absorbing heat from the passenger compartment and cooling it.

[0055] Battery cooling circuit 2 is specifically used to cool the battery inside the vehicle. In related technologies, when a vehicle has a battery cooling requirement, the refrigerant in the air conditioning cooling circuit is often used to cool the battery.

[0056] Specifically, such as Figure 1 In this configuration, both the battery cooling circuit 2 and the air conditioning refrigeration circuit 1 are connected to the battery cooler 21. An electronic valve is also installed on the connection path between the air conditioning refrigeration circuit 1 and the battery cooler 21. The refrigerant in the air conditioning refrigeration circuit 1 flows into the battery cooler 21 through the electronic valve 13. The battery cooler 21 is used to exchange heat between the coolant in the battery cooling circuit 2 and the refrigerant in the air conditioning refrigeration circuit 1. After heat exchange, the temperature of the coolant in the battery cooling circuit 2 decreases, thereby absorbing heat from the battery and cooling it.

[0057] Control module 3, integrated within the vehicle controller, is electrically connected to air conditioning cooling circuit 1, battery cooling circuit 2, and electronic valve 13. Control module 3 responds to the vehicle's air conditioning and battery cooling needs, controlling air conditioning cooling circuit 1 and battery cooling circuit 2 to enter operating mode, and opening electronic valve 13 for air conditioning and battery cooling.

[0058] However, when the vehicle has both air conditioning refrigeration demand and battery cooling demand, if too much refrigerant flows into the battery cooler 21 through the electronic valve, the refrigeration performance of the air conditioning refrigeration circuit will be affected, the refrigeration temperature in the passenger compartment will fluctuate, and the user's cooling experience will be affected.

[0059] To solve the above problems, the embodiment of the present application provides a battery cooling method. In the process of battery cooling and air conditioning refrigeration, the opening degree of the electronic valve is adjusted to adjust the flow of refrigerant in the air conditioning refrigeration circuit 1 into the battery cooling circuit.

[0060] Referring to Figure 2 A flow chart of a battery cooling method provided by the embodiment of the present application. The method is applied to the control module 3. As Figure 2 shown, the processing steps of the method can specifically include:

[0061] Step 101, when the first cell temperature of the battery is greater than the cell cooling threshold value and the vehicle has air conditioning refrigeration demand, the current second cell temperature of the battery is obtained.

[0062] Specifically, the control module 3 can detect the cell temperature of the battery in real time. If the control module 3 detects that the first cell temperature at a certain time is greater than the cell cooling threshold value, it is determined that the battery needs to be cooled. Optionally, the cell cooling threshold value can be set according to the actual situation, and the embodiment of the present application is not limited.

[0063] The control module 3 detects that the vehicle has air conditioning refrigeration demand, which can specifically include: the control module 3 detects that the user has turned on the air conditioning equipment in the vehicle, and then determines that the vehicle has air conditioning refrigeration demand. Alternatively, the control module 3 obtains the first temperature in the vehicle and judges whether the vehicle has air conditioning refrigeration demand according to the first temperature in the vehicle. It can be understood that if there is air conditioning refrigeration demand, the control module 3 can control to turn on the air conditioning equipment in the vehicle. The air conditioning refrigeration circuit 1 enters the working state to cool the passenger compartment in the vehicle and improve the user's experience in the vehicle.

[0064] Step 102, if the second cell temperature is less than the cell limit threshold value, start timing and perform battery primary cooling.

[0065] In the embodiment of the present application, the cell limit threshold value can be a cell temperature limit value obtained by a large number of test experiments in advance. For example, the cell limit threshold value can be 48℃. Of course, the cell limit threshold value can also be other numerical values, and the embodiment of the present application is not limited.

[0066] If the second cell temperature of the battery is less than the preset cell temperature limit value, it indicates that the working performance of the current battery has not been affected. Based on this, the control module 3 performs battery primary cooling to preferentially meet the air conditioning refrigeration demand of the passenger compartment in the vehicle.

[0067] Specifically, referring to steps 103 to 106, the control module 3 performing primary battery cooling may include:

[0068] Step 103: Determine the first opening value based on the timing time and the opening change cycle of the electronic valve.

[0069] As one possible approach, control module 3 has a pre-set formula for calculating the opening degree of the electronic valve. This can be expressed as:

[0070]

[0071] Wherein, μ, λ, and γ are all calibration parameters, which can be obtained in advance through a large number of experiments and are not limited in the embodiments of the present invention.

[0072] According to formula (1), in this embodiment of the invention, the opening degree of the electronic valve changes periodically with time. The period of change of the opening degree of the electronic valve is 2μ. The opening degree range of the electronic valve is 0~λ.

[0073] See Figure 3 This is a schematic diagram illustrating the change in the opening degree of an electronic valve over time, provided by an embodiment of the present invention. Taking γ = 0 as an example, according to formula (1), at t = 0, the first opening degree value of the electronic valve is p1 = λ. The control module 3 controls the opening of the electronic valve and adjusts the opening degree of the electronic valve to λ.

[0074] According to formula (1), within the time interval [0, μ], the first opening value of the electronic valve gradually decreases from λ to 0. Within the time interval [μ, 2μ], the first opening value of the electronic valve gradually increases from 0 to λ. The control module 3 cyclically controls the opening of the electronic valve according to the preset opening change cycle. The control module 3 adjusts the opening of the electronic valve to the first opening value in real time, realizing the slow opening and slow closing of the electronic valve, thereby avoiding the problem of poor air conditioning cooling effect caused by excessive changes in the opening of the electronic valve. Of course, γ can also be any value within [0, 2] obtained through a large number of tests, in order to take into account both battery cooling requirements and air conditioning cooling requirements. This embodiment of the invention does not limit the value.

[0075] Step 104: Determine the first opening compensation value based on the difference between the actual cooling temperature and the target cooling temperature of the air conditioning refrigeration circuit.

[0076] As one feasible approach, control module 3 has a preset formula for calculating opening compensation. This can be expressed as:

[0077] p2=ωΔ Formula (2)

[0078] Wherein, ω is the opening compensation coefficient, which can be obtained in advance through a large number of experimental tests, and is not limited in the embodiments of the present invention.

[0079] Δ is the difference between the actual refrigeration temperature of the air conditioning refrigeration circuit and the target refrigeration temperature. The actual refrigeration temperature of the air conditioning refrigeration circuit can be determined according to the actual temperature of the evaporator. The target refrigeration temperature can be the refrigeration temperature set by the user.

[0080] In some embodiments, the control module 3 can also determine the target temperature of the evaporator according to the refrigeration temperature set by the user. The control module 3 determines the first opening degree compensation value according to the difference between the actual temperature and the target temperature of the evaporator.

[0081] In step 105, the target opening degree of the electronic valve is determined according to the first opening degree value and the first opening degree compensation value. The target opening degree of the electronic valve can be represented as:

[0082]

[0083] According to formula (3), the target opening degree of the electronic valve is the first difference between the first opening degree value and the first opening degree compensation value.

[0084] In a specific application scenario, if the battery cooling and the air conditioning refrigeration start at the same time, the difference between the actual refrigeration temperature and the target refrigeration temperature of the air conditioning refrigeration circuit is large. The target opening degree of the electronic valve calculated by the control module 3 according to formula (3) is small, so that the refrigeration demand of the air conditioning refrigeration circuit can be met preferentially, and the problem of poor refrigeration effect of the air conditioner caused by large opening degree of the electronic valve can be avoided.

[0085] Alternatively, if the control module 3 starts battery cooling when the air conditioner has been on for a period of time, the difference between the actual refrigeration temperature and the target refrigeration temperature of the air conditioning refrigeration circuit is small. The target opening degree of the electronic valve calculated by the control module 3 according to formula (3) is large, so that the battery cooling demand and the air conditioning refrigeration demand can be considered.

[0086] In step 106, the opening degree of the electronic valve is adjusted to the target opening degree, so that the refrigerant of the air conditioning refrigeration circuit flows into the battery cooler through the electronic valve and cools the battery.

[0087] The battery cooling method provided by the embodiments of the present application periodically adjusts the opening degree of the electronic valve when the vehicle has air conditioning refrigeration demand and battery cooling demand, so as to adjust the flow of the refrigerant of the air conditioning refrigeration circuit distributed to the battery cooling circuit, thereby avoiding the problem of poor refrigeration effect of the air conditioner caused by large opening degree of the electronic valve.

[0088] In the following, the above-mentioned battery cooling method is described in detail in combination with specific embodiments.

[0089] Referring to Figure 4 is a structural schematic diagram of another battery cooling system provided by the embodiments of the present application.

[0090] As Figure 4As shown, the battery cooling circuit 2 can further include a battery water pump 22, a battery liquid cooling plate 23 and a compensation water kettle 24. The battery water pump 22 is connected with the battery liquid cooling plate 23 and the compensation water kettle 24 in sequence.

[0091] The battery water pump 22 is specifically configured to draw the cooling liquid into the battery liquid cooling plate 23.

[0092] The battery liquid cooling plate 23 is specifically configured to absorb the heat of the battery through the cooling liquid to cool the battery.

[0093] The compensation water kettle 24 is specifically configured to provide the cooling liquid for the battery cooling circuit 2, so as to ensure the sufficiency of the cooling liquid in the battery cooling circuit.

[0094] In a specific application scenario, when the vehicle has a battery cooling demand, the battery water pump is started, and the cooling liquid circulates in the battery cooling circuit 2. After the cooling liquid enters the battery liquid cooling plate, the temperature of the battery liquid cooling plate is reduced, thereby absorbing the heat of the battery to cool the battery. At the same time, the compressor 11 of the air conditioning refrigeration circuit 1 is started to provide refrigerant for the battery cooling circuit 2. The refrigerant enters the battery cooler through the electronic valve. As shown in Figure 4 The battery cooler is provided with a refrigerant side and a cooling liquid side. The refrigerant of the air conditioning refrigeration circuit enters the refrigerant side of the battery cooler through the electronic valve. The cooling liquid flowing out of the battery liquid cooling plate enters the cooling liquid side of the battery cooler and exchanges heat with the refrigerant of the refrigerant side. The temperature of the cooling liquid after heat exchange is reduced, and the cooling liquid reenters the battery liquid cooling plate through the battery water pump to cool the battery.

[0095] As shown in Figure 4 , a water temperature sensor can be further arranged between the battery water cooling and the battery liquid cooling plate, and is specifically configured to obtain the actual temperature of the cooling liquid at the battery water inlet.

[0096] Similarly, the refrigerant after heat exchange reenters the air conditioning refrigeration circuit to circulate. As shown in Figure 4 , the battery cooling system further includes a temperature and pressure sensor. The temperature and pressure sensor is arranged on the connection passage between the refrigerant side of the battery cooler and the air conditioning refrigeration circuit, and is specifically configured to obtain the actual outlet superheat of the refrigerant outlet of the battery cooler.

[0097] Referring to Figure 5 , a flow chart of another battery cooling method provided by the embodiment of the present application is provided. The method is applied to the control module 3. The control module 3 includes a second proportional-integral (hereinafter referred to as PI) module, which is configured to calculate the opening degree of the electronic valve.

[0098] As shown in Figure 5 , the processing steps of the method can specifically include:

[0099] Step 201, the control module 3 acquires a first cell temperature of the battery.

[0100] Step 202, the control module 3 determines whether the first cell temperature is greater than a cell cooling threshold. If the first cell temperature is greater than the cell cooling threshold, step 203 is performed. If the first cell temperature is less than the cell cooling threshold, step 222 is performed, and the battery is not cooled.

[0101] Step 203, if the first cell temperature is greater than the cell cooling threshold, the control module 3 determines whether there is an air conditioning refrigeration demand of the vehicle. If there is an air conditioning refrigeration demand, step 204 is performed. If there is no air conditioning refrigeration demand, step 213 is performed.

[0102] Step 204, if there is, the control module 3 acquires a second cell temperature of the battery in real time.

[0103] Step 205, the control module 3 determines whether the second cell temperature is greater than a cell limit threshold. If the second cell temperature is less than the cell limit threshold, step 206 is performed. If the second cell temperature is greater than the cell limit threshold, step 213 is performed.

[0104] Step 206, if the second cell temperature is less than the cell limit threshold, the control module 3 starts timing and performs a first-level cooling of the battery.

[0105] Step 207, the control module 3 determines a first opening value according to the timing time and the opening change period of the electronic valve.

[0106] Step 208, the control module 3 determines a first opening compensation value according to the difference between the actual refrigeration temperature of the air conditioning refrigeration circuit and the target refrigeration temperature.

[0107] Step 209, the control module 3 determines whether the first opening value is greater than or equal to the first opening compensation value.

[0108] Step 210, if the first opening value is less than the first opening compensation value, the control module 3 controls the electronic valve to be closed, and the cooling of the battery is suspended.

[0109] Step 211, if the first opening value is greater than or equal to the first opening compensation value, the control module 3 takes a first difference between the first opening value and the first opening compensation value as a target opening of the electronic valve.

[0110] Step 212, the control module 3 adjusts the opening of the electronic valve to the target opening to make the refrigerant of the air conditioning refrigeration circuit flow into the battery cooler through the electronic valve and cool the battery.

[0111] Step 213, if the vehicle does not have air conditioning cooling demand, or if the second battery cell temperature is greater than the battery cell threshold, the control module 3 executes the battery secondary cooling, and acquires the actual outlet superheat of the battery cooler in real time.

[0112] Step 214, the control module 3 acquires the third difference between the actual outlet superheat and the target outlet superheat.

[0113] Step 215, the control module 3 determines the second opening of the electronic valve by performing proportional integral calculation on the third difference through the second PI module.

[0114] Step 216, the control module 3 adjusts the opening of the electronic valve to the second opening to make the refrigerant of the air conditioning cooling circuit flow into the battery cooler through the electronic valve to cool the battery.

[0115] Step 217, the control module 3 judges whether the actual outlet superheat reaches the target outlet superheat.

[0116] Step 218, if yes, the control module 3 controls the opening of the electronic valve within the target opening range. The target opening range can be obtained through a large number of test experiments. When the opening of the electronic valve is within the target opening range, the battery cooling and the air conditioning cooling are both in a stable state. For example, the target opening range can be 20% to 30%. Of course, the target opening range can also be other values, and the embodiment of the present application is not limited thereto.

[0117] Step 219, the control module 3 acquires the third battery cell temperature in real time.

[0118] Step 220, the control module 3 judges whether the third battery cell temperature is less than or equal to the target battery cell temperature.

[0119] In the embodiment, the target battery cell temperature can be the battery cell temperature of the battery in a good working state obtained through a large number of test experiments. It can be understood that the target battery cell temperature can be determined according to the battery cell cooling threshold. The target battery cell temperature is less than or equal to the battery cell cooling threshold. Of course, it can also be set according to the situation, and the embodiment of the present application is not limited thereto.

[0120] Step 221, if yes, the control module 3 controls to close the electronic valve and stop cooling the battery.

[0121] The battery cooling method provided by the embodiment of the present application periodically adjusts the opening of the electronic valve when the vehicle has air conditioning cooling demand and battery cooling demand, so as to adjust the flow of the refrigerant of the air conditioning cooling circuit distributed to the battery cooling circuit, thereby avoiding the problem that the refrigeration effect of the air conditioner is poor due to the large opening of the electronic valve.

[0122] Reference should be made to Figure 6A flowchart of a method for providing refrigerant by an air conditioning refrigeration circuit is provided for an embodiment of the present application. The method is applied to a control module 3. The control module 3 comprises a first proportional-integral (PI) module for calculating the rotation speed of the compressor.

[0123] As shown in Figure 6 , the processing steps of the method can include:

[0124] Step 301, when the control module 3 detects that the first cell temperature of the battery is greater than the cell cooling threshold value, and the vehicle has an air conditioning refrigeration demand, the second difference between the actual temperature and the target temperature of the battery water inlet is obtained in real time.

[0125] Step 302, the control module 3 calculates the first rotation speed of the compressor according to the second difference by the first proportional-integral (PI) module.

[0126] Step 303, the control module 3 determines the second rotation speed of the compressor according to the target refrigeration temperature.

[0127] Step 304, the control module 3 takes the sum of the first rotation speed and the second rotation speed as the target rotation speed of the compressor.

[0128] Step 305, the control module 3 adjusts the rotation speed of the compressor to the target rotation speed to provide refrigerant.

[0129] In this embodiment, when the vehicle is air conditioning refrigeration and battery cooling, the rotation speed of the compressor is adjusted to regulate the refrigerant flow of the air conditioning refrigeration circuit. Without changing the large displacement compressor, the cooling effect of the air conditioning refrigeration circuit and the battery cooling circuit is effectively guaranteed, and the refrigeration efficiency is improved.

[0130] Figure 7 A structural schematic diagram of an embodiment of an electronic device of an embodiment of the present application is shown in Figure 7 The above electronic device can include at least one processor and at least one memory in communication with the processor, wherein the memory stores program instructions executable by the processor, and the processor invokes the program instructions to execute the battery cooling method provided in the embodiment of the present application. Figures 1-6

[0131] The above electronic device can be a device capable of controlling the air conditioning refrigeration circuit and the battery cooling circuit. The specific form of the electronic device is not limited in the embodiment of the present application. It can be understood that the electronic device herein is the machine mentioned in the method embodiment.

[0132] Figure 7 A block diagram of an exemplary electronic device suitable for implementing embodiments of the present application is shown.​Figure 7 The electronic device illustrated is merely one example and should not be taken as limiting the scope of functionality or use of embodiments of the application.

[0133] As shown Figure 7 The electronic device is in the form of a general purpose computing device. Components of the electronic device can include, but are not limited to, one or more processors 410, system memory 430, and a communication bus 440 that connects the various system components including the system memory 430 and the processing unit 410.

[0134] The communication bus 440 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration bus, a processor or local bus using any of a variety of bus architectures including Industry Standard Architecture (ISA), Micro Channel Architecture (MCA), Enhanced ISA (EISA), Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.

[0135] The electronic device typically includes a variety of computer system readable media. Such media can be any available media that is accessible by the electronic device and includes both volatile and non-volatile media, removable and non-removable media.

[0136] The memory 430 can include computer system readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The electronic device can further include other removable / non-removable, volatile / non-volatile computer system storage media. The memory 430 can include a program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the application.

[0137] The program / utility, having a set (at least one) of program modules, can be stored in memory 430, for execution by the processing unit 410, including by way of example, an operating system, one or more application programs, other program modules, and program data, each or any combination thereof, can include implementation of a networking environment. Generally, program modules are executed by the processing unit 410 in memory 430 as a single logical processing unit or in a logical or physical partition as appropriate.

[0138] The processor 410 performs a variety of functions as described in the embodiments of the present application including those described in the embodiments of the present application by executing the program stored in the memory 430. Figures 1-6 The battery cooling method provided by the embodiment.

[0139] The non-transitory computer readable storage medium stores computer instructions, which cause the computer to perform the method of the embodiment of the present application. Figures 1-6 The battery cooling method provided by the embodiment.

[0140] The non-transitory computer readable storage medium can be any combination of one or more computer readable media. The computer readable media can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer readable storage medium can be any tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device.

[0141] A computer readable signal medium can include a propagated data signal with computer executable code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal can take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium can be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate or transport programming code such as instructions for execution by a processor or processor- circuitry

[0142] Program code embodied on a computer readable medium can be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0143] Computer program code for carrying out operations for aspects of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0144] The specific embodiments of the present application have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. In addition, processes depicted in the accompanying figures are not necessarily to be construed as limited to the specific orders shown and / or described herein. Rather, the various blocks in the flowsheets can be performed in an order other than that which is illustrated, or performed concurrently. In some embodiments, multitasking and parallel processing can be advantageous.

[0145] In the description of the embodiments of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. The illustrative representation of the above terms in the embodiments of the present application does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the embodiments of the present application and the features of the different embodiments or examples, without contradiction.

[0146] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0147] Any process or method descriptions, or any other descriptions herein, can be understood as representing embodiments of the application comprising an executable code of modules, segments or portions of codes including one or more steps for accomplishing a specific logical function or process, and the scope of the preferred embodiments of the present application includes additional implementation in which the functions are accomplished in the same way but in a different order, including according to the function involved, in a substantially simultaneous manner or in reverse order, which should be understood by those skilled in the art of the embodiments of the present application.

[0148] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "while" or "in response to determining" or "in response to detecting". Similarly, the phrase "if it is determined" or "if (a stated condition or event) is detected" can be interpreted to mean "when it is determined" or "in response to determining" or "when (a stated condition or event) is detected" or "in response to detecting (a stated condition or event)".

[0149] It should be noted that the terminal involved in the embodiments of the present application can include, but is not limited to, a personal computer (Personal Computer; hereinafter referred to as PC), a personal digital assistant (Personal Digital Assistant; hereinafter referred to as PDA), a wireless handheld device, a tablet computer, a mobile phone, an MP3 player, an MP4 player, etc.

[0150] In several embodiments provided by the embodiments of the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the embodiments of the device described above are merely schematic, and the division of the units is merely a logical function division. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0151] In addition, each function unit in the various embodiments of the embodiments of the present application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware, or in the form of hardware plus software function units.

[0152] The integrated unit implemented in the form of software function units can be stored in a computer readable storage medium. The above software function unit stored in a storage medium includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute some steps of the method described in the various embodiments of the embodiments of the present application. The above storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0153] The above merely provides the preferred embodiments of the embodiments of the present application, but is not intended to limit the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included in the scope of protection of the embodiments of the present application.

Claims

1. A battery cooling method, characterized by, The method is applied to a battery cooling system, the battery cooling system comprising: an air conditioning refrigeration circuit, a battery cooling circuit and a control module; the air conditioning refrigeration circuit and the battery cooling circuit are both communicated with a battery cooler, an electronic valve is arranged on a connecting passage of the air conditioning refrigeration circuit and the battery cooler; the control module executes the method, comprising: When it is detected that a first cell temperature of a battery is greater than a cell cooling threshold value, and a vehicle exists an air conditioning refrigeration demand, a second cell temperature of the battery is acquired; If the second cell temperature is less than a cell limit threshold value, a timing is started and a battery primary cooling is executed, wherein the battery primary cooling comprises: A first opening degree value is determined according to a timing time and an opening degree change period of the electronic valve; A first opening degree compensation value is determined according to a difference between an actual refrigeration temperature and a target refrigeration temperature of the air conditioning refrigeration circuit; A target opening degree of the electronic valve is determined according to the first opening degree value and the first opening degree compensation value; An opening degree of the electronic valve is adjusted to the target opening degree, so that refrigerant of the air conditioning refrigeration circuit flows into the battery cooler through the electronic valve and cools the battery; The first opening degree value is determined according to the timing time and the opening degree change period of the electronic valve, comprising: According to the formula: determining the first opening value; wherein the p1 is the first opening value, the μ, λ, γ are all calibration parameters, the t is the timing time, the opening change period of the electronic valve is 2μ, and the opening range of the electronic valve is 0-λ. The first opening degree compensation value is determined according to the difference between the actual refrigeration temperature and the target refrigeration temperature of the air conditioning refrigeration circuit, comprising: The first opening degree compensation value is determined according to a formula: p2 = ωΔ; wherein the p2 is the first opening degree compensation value, the ω is an opening degree compensation coefficient, and the Δ is the difference between the actual refrigeration temperature and the target refrigeration temperature of the air conditioning refrigeration circuit; The target opening degree of the electronic valve is determined according to the first opening degree value and the first opening degree compensation value, comprising: According to the formula: determining the target opening degree; wherein the p is the target opening degree.

2. The method of claim 1, wherein, The target opening degree of the electronic valve is determined according to the first opening degree value and the first opening degree compensation value, comprising: A first difference between the first opening degree value and the first opening degree compensation value is taken as the target opening degree of the electronic valve.

3. The method of claim 2, wherein, The first difference between the first opening degree value and the first opening degree compensation value is taken as the target opening degree of the electronic valve, further comprising: If the first opening degree value is less than or equal to the first opening degree compensation value, the electronic valve is controlled to be closed, and the cooling of the battery is paused.

4. The method of claim 1, wherein, The air conditioning refrigeration circuit comprises a compressor; the battery cooling circuit comprises a battery liquid cooling plate, a water temperature sensor is connected to a battery water inlet of the battery liquid cooling plate, and is used to acquire an actual temperature of the battery water inlet; the control module comprises a first proportional integral PI module, which is used to determine a rotating speed of the compressor corresponding to a decrease of the actual temperature of the battery water inlet to a target temperature; After it is detected that the first cell temperature of the battery is greater than the cell cooling threshold value, and the vehicle exists the air conditioning refrigeration demand, the method further comprises: A second difference between the actual temperature and the target temperature of the battery water inlet is acquired in real time; The second difference is proportional-integral calculated according to the first proportional integral PI module, to determine a first rotating speed of the compressor; A second rotating speed of the compressor is determined according to the target refrigeration temperature. adding the first rotation speed and the second rotation speed as a target rotation speed of the compressor; adjusting the rotation speed of the compressor to the target rotation speed to cool the battery by the refrigerant.

5. The method of claim 1, wherein, The battery cooler is provided with a refrigerant outlet; the refrigerant outlet is connected with a temperature pressure sensor for obtaining an actual outlet superheat degree of the battery cooler; the control module comprises a second PI module for determining an opening degree of the electronic valve corresponding to reducing the actual outlet superheat degree of the battery cooler to a target outlet superheat degree; If the vehicle does not have the air conditioning cooling demand, or if the second battery cell temperature is greater than the battery cell limit threshold, a battery secondary cooling is performed; The battery secondary cooling comprises: real-time obtaining a third difference between the actual outlet superheat degree and the target outlet superheat degree; performing proportional integral calculation on the third difference according to the second PI module to determine a second opening degree of the electronic valve; adjusting the opening degree of the electronic valve to the second opening degree to make the refrigerant of the air conditioning refrigeration circuit flow into the battery cooler through the electronic valve to cool the battery until the actual outlet superheat degree reaches the target outlet superheat degree.

6. The method of claim 5, wherein, After the actual outlet superheat degree reaches the target outlet superheat degree, the method further comprises: controlling the opening degree of the electronic valve within a target opening degree range.

7. The method of claim 1, wherein, After the battery is cooled, the method further comprises: real-time detecting a third battery cell temperature of the battery and determining whether the third battery cell temperature is less than or equal to a target battery cell temperature, the target battery cell temperature being determined according to the battery cell cooling threshold; if the third battery cell temperature is less than or equal to the target battery cell temperature, controlling to close the electronic valve to stop cooling the battery.

8. A battery cooling system characterized by, The battery cooling method comprises: an air conditioning refrigeration circuit, a battery cooling circuit and a control module; the air conditioning refrigeration circuit and the battery cooling circuit are both communicated with a battery cooler, and the air conditioning refrigeration circuit is provided with an electronic valve on a connecting passage of the battery cooler; the control module is used to perform the battery cooling method according to any one of claims 1 to 7.

9. An electronic device, comprising: comprise: at least one processor; and at least one memory connected with the processor in communication, wherein: the memory stores program instructions executable by the processor, and the processor calling the program instructions can perform the method according to any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium, comprising: The non-transitory computer readable storage medium stores computer instructions, and the computer instructions make the computer perform the method according to any one of claims 1 to 7.

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