Battery cooling method and system

Abstract

The embodiment of the invention relates to the technical field of electric vehicles, in particular to a battery cooling method and system. The method comprises the steps that when it is detected that the first battery cell temperature is larger than a battery cell cooling threshold value and the vehicle has the air conditioner refrigeration requirement, the second battery cell temperature of a battery is obtained; if the second battery cell temperature is smaller than the battery cell limit threshold value, timing is started, and primary cooling of the battery is executed, specifically, a first opening value is determined according to the timing time and the opening change period of the electronic valve; according to the difference value between the actual refrigeration temperature and the target refrigeration temperature, a first opening compensation value is determined; according to the first opening value and the first opening compensation value, the target opening of the electronic valve is determined; and adjusting the opening degree of the electronic valve to be the target opening degree so as to cool the battery. By periodically adjusting the opening degree of the electronic valve, the problems of slow refrigeration and poor refrigeration effect of the air conditioner when the battery is cooled are effectively solved.

Description

[Technical field]

[0001] The embodiments of the present invention relate to the technical field of electric vehicles, and in particular to a battery cooling method and system. [Background technology]

[0002] At present, new energy electric vehicles have two cooling requirements, including air conditioning refrigeration requirements and battery cooling requirements. In related technologies, the refrigerant of the air conditioning refrigeration circuit is allocated to the battery cooling circuit to achieve battery cooling and ensure efficient operation of the battery.

[0003] The ensuing problem is that when both the air conditioner and the battery have cooling needs at the same time, if the refrigerant flow into the battery cooling circuit is too large, it will reduce the cooling capacity of the air conditioner and affect user comfort.

[0004] Therefore, how to reasonably control the distribution of refrigerant flow in the air-conditioning system and on the battery side to meet the cooling needs of the air-conditioning and batteries has become a problem that needs to be solved. [Summary of the invention]

[0005] The embodiment of the present invention provides a battery cooling method and system, which periodically adjusts the opening of an electronic valve so that the refrigerant of an air-conditioning refrigeration circuit flows into a battery cooler through the electronic valve and cools the battery.

[0006] In a first aspect, an embodiment of the present invention provides a battery cooling method, comprising:

[0007] When it is detected that the temperature of the first battery cell of the battery is greater than the battery cell cooling threshold and the vehicle has air conditioning cooling demand, the current temperature of the second battery cell of the battery is obtained;

[0008] If the temperature of the second battery cell is less than the battery cell limit threshold, the timing is started and the first-level battery cooling is performed, wherein the first-level battery cooling includes:

[0009] Determining a first opening value according to the timing time and the opening change cycle of the electronic valve;

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

[0011] determining a target opening of the electronic valve according to the first opening value and the first opening compensation value;

[0012] The opening of the electronic valve is adjusted to the target opening so that the refrigerant of the air-conditioning refrigeration circuit flows into the battery cooler through the electronic valve and cools the battery.

[0013] In one possible implementation, determining the target opening of the electronic valve according to the first opening value and the first opening compensation value includes:

[0014] A first difference between the first opening value and the first opening compensation value is used as the target opening of the electronic valve.

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

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

[0017] In one possible implementation, the air conditioning refrigeration circuit includes a compressor; the battery cooling circuit includes a battery liquid cooling plate, and a water temperature sensor is connected to the battery water inlet of the battery liquid cooling plate to obtain the actual temperature of the battery water inlet; the control module includes a first proportional integral PI module, which is used to determine the speed of the compressor corresponding to reducing the actual temperature of the battery water inlet to the target temperature;

[0018] After detecting that the first battery cell temperature of the battery is greater than the battery cell cooling threshold and the vehicle has an air conditioning cooling demand, the method further includes:

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

[0020] performing proportional-integral calculation on the second difference according to the first PI module to determine a first speed of the compressor;

[0021] determining a second speed of the compressor according to the target refrigeration temperature;

[0022] taking the sum of the first speed and the second speed as the target speed of the compressor;

[0023] The rotation speed of the compressor is adjusted to the target rotation speed so as to cool the battery through the refrigerant.

[0024] In one possible implementation, the battery cooler is provided with a refrigerant outlet; the refrigerant outlet is connected to a temperature and pressure sensor for obtaining an actual outlet superheat of the battery cooler; the control module includes a second PI module for determining an opening of the electronic valve corresponding to reducing the actual outlet superheat of the battery cooler to a target outlet superheat;

[0025] If the vehicle does not have the air conditioning cooling demand, or if the second battery cell temperature is greater than the limit temperature threshold, performing secondary battery cooling;

[0026] Wherein, the secondary cooling of the battery comprises:

[0027] acquiring in real time a third difference between the actual outlet superheat and the target outlet superheat;

[0028] According to the second PI module, performing proportional integral calculation on the third difference to determine a second opening degree of the electronic valve;

[0029] The opening of the electronic valve is adjusted to the second opening so that the refrigerant of the air conditioning 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 includes:

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

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

[0033] detecting a third battery cell temperature of the battery in real time, and determining whether the third battery cell temperature is less than or equal to a target battery cell temperature, wherein the target battery cell temperature is determined according to the battery cell cooling threshold;

[0034] If the third battery cell temperature is less than or equal to the target battery cell temperature, the electronic valve is controlled to close to stop cooling the battery.

[0035] In a second aspect, an embodiment of the present invention provides a 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 connected to a battery cooler, and an electronic valve is provided on the connection path between the air-conditioning refrigeration circuit and the battery cooler; the control module is used to execute the battery cooling method as described in the first aspect.

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

[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 can execute the method as described in the first aspect by calling the program instructions.

[0040] In a fourth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the method described in the first aspect.

[0041] The battery cooling method provided in an embodiment of the present invention periodically adjusts the opening of the electronic valve to adjust the flow rate of the refrigerant distributed to the battery cooler by the air-conditioning refrigeration circuit when the vehicle has air-conditioning refrigeration needs and battery cooling needs, thereby avoiding the problem of poor air-conditioning cooling effect caused by a large opening of the electronic valve.

Brief Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 A schematic diagram of the structure of a battery cooling system provided by an embodiment of the present invention;

[0044] Figure 2 A flowchart of a battery cooling method provided by an embodiment of the present invention;

[0045] Figure 3 A schematic diagram showing the change of the opening degree of an electronic valve over time provided by an embodiment of the present invention;

[0046] Figure 4 A schematic diagram of the structure of another battery cooling system provided by an embodiment of the present invention;

[0047] Figure 5 A flowchart of another battery cooling method provided by an embodiment of the present invention;

[0048] Figure 6 A flow chart of a method for providing refrigerant to an air-conditioning refrigeration circuit provided by an embodiment of the present invention;

[0049] Figure 7 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. [Specific implementation method]

[0050] In order to better understand the technical solution of the embodiment of the present invention, the embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0051] It should be clear that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments in the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present invention.

[0052] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

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

[0054] The air conditioning refrigeration circuit 1 is specifically used to cool the passenger compartment in the vehicle. Specifically, the air conditioning refrigeration circuit 1 may include a compressor 11 and an evaporator 12. When the vehicle has an air conditioning refrigeration demand, the compressor 11 and the evaporator 12 enter the working state. The compressor 11 is used to provide refrigerant for the air conditioning refrigeration circuit. After the refrigerant enters the evaporator 12, the temperature of the evaporator decreases, thereby absorbing the heat in the passenger compartment and cooling the passenger compartment.

[0055] The battery cooling circuit 2 is specifically used to cool the battery in the vehicle. In the related art, when the vehicle has a battery cooling demand, the battery is often cooled by the refrigerant of the air conditioning refrigeration circuit.

[0056] Specifically, Figure 1 In the embodiment, the battery cooling circuit 2 and the air conditioning refrigeration circuit 1 are both connected to the battery cooler 21. At the same time, an electronic valve is also provided 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 1 and the refrigerant in the air conditioning refrigeration circuit 1. After the heat exchange, the temperature of the coolant in the battery cooling circuit 1 decreases, thereby absorbing the heat of the battery and cooling the battery.

[0057] The control module 3 is integrated in the vehicle controller and is electrically connected to the air conditioning refrigeration circuit 1, the battery cooling circuit 2 and the electronic valve 13. The control module 3 is used to respond to the vehicle's air conditioning refrigeration and battery cooling requirements, control the air conditioning refrigeration circuit 1 and the battery cooling circuit 2 to enter the working state, and open the electronic valve 13 for air conditioning refrigeration and battery cooling.

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

[0059] In view of the above problems, an embodiment of the present invention provides a battery cooling method. During battery cooling and air conditioning refrigeration, the opening of the electronic valve is adjusted to adjust the flow rate of the refrigerant in the air conditioning refrigeration circuit 1 into the battery cooling circuit.

[0060] See also Figure 2 , is a flow chart of a battery cooling method provided by an embodiment of the present invention. The method is applied to the control module 3. Figure 2 As shown, the processing steps of the method may specifically include:

[0061] Step 101: When it is detected that a first battery cell temperature of the battery is greater than a battery cell cooling threshold and the vehicle has an air conditioning cooling demand, obtain a current second battery cell temperature of the battery.

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

[0063] The control module 3 detects that the vehicle has air conditioning and refrigeration needs, which may 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 and refrigeration needs. Alternatively, the control module 3 obtains the first temperature in the vehicle, and determines whether the vehicle has air conditioning and refrigeration needs based on the first temperature in the vehicle. It is understandable that if there is air conditioning and refrigeration needs, the control module 3 can control the turning on of the air conditioning equipment in the vehicle. The air conditioning refrigeration circuit 1 enters the working state, cools the passenger compartment in the vehicle, and improves the user experience in the vehicle.

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

[0065] In the embodiment of the present invention, the cell limit threshold may be a cell temperature limit value obtained in advance through a large number of experimental tests. For example, the cell limit threshold may be 48° C. Of course, the cell limit threshold may also be other values, which are not limited in the embodiment of the present invention.

[0066] If the temperature of the second battery cell of the battery is lower than the preset battery cell temperature limit value, it indicates that the current working performance of the battery has not been affected. Based on this, the control module 3 performs primary cooling of the battery to give priority to meeting the air conditioning and cooling requirements of the passenger compartment in the vehicle.

[0067] Specifically, referring to step 103 to step 106, the control module 3 may perform the first-level cooling of the battery, including:

[0068] Step 103: Determine a first opening value according to the timing time and the opening variation cycle of the electronic valve.

[0069] As a feasible method, the control module 3 is preset with a calculation formula for the opening of the electronic valve. It can be expressed as:

[0070]

[0071] Among them, μ, λ, and θ are all calibration parameters, which can be obtained in advance through a large number of experimental tests and are not limited in the embodiment of the present invention.

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

[0073] See also Figure 3 , is a schematic diagram of the change of the opening 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 time t=0, the first opening value p1=λ of the electronic valve. The control module 3 controls the opening of the electronic valve and adjusts the opening of the electronic valve to λ.

[0074] According to formula (1), within the time [0, μ], the first opening value of the electronic valve gradually decreases from λ to 0. Within the time [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 a preset opening change cycle. The control module 3 adjusts the opening of the electronic valve to the first opening value in real time to achieve slow opening and closing of the electronic valve, thereby avoiding the problem of poor cooling effect of the air conditioner due to 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 experimental tests to take into account both the battery cooling requirements and the air conditioning cooling requirements, and the embodiments of the present invention are not limited thereto.

[0075] Step 104: Determine a first opening compensation value according to a difference between an actual refrigeration temperature and a target refrigeration temperature of the air-conditioning refrigeration circuit.

[0076] As a feasible method, the control module 2 is preset with an opening compensation calculation formula. It can be expressed as:

[0077] p2=ωΔFormula (2)

[0078] Wherein, ω is an opening compensation coefficient, which can be obtained in advance through a large number of experimental tests and is not limited in the embodiment 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 based on 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 may 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 compensation value according to the difference between the actual temperature of the evaporator and the target temperature.

[0081] Step 105: Determine the target opening of the electronic valve according to the first opening value and the first opening compensation value. The target opening of the electronic valve can be expressed as:

[0082]

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

[0084] In a specific application scenario, if battery cooling and air conditioning refrigeration are started 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 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 first, avoiding the problem of poor refrigeration effect of the air conditioning due to the large opening of the electronic valve.

[0085] Alternatively, if the air conditioner has been turned on for a period of time when the control module 3 starts to cool the battery, the difference between the actual cooling temperature of the air conditioner refrigeration circuit and the target cooling temperature is small. The target opening of the electronic valve calculated by the control module 3 according to formula (3) is large to take into account both the battery cooling demand and the air conditioner refrigeration demand.

[0086] Step 106 : Adjust the opening of the electronic valve to the target opening 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 in an embodiment of the present invention periodically adjusts the opening of the electronic valve to adjust the flow rate of the refrigerant distributed from the air-conditioning refrigeration circuit to the battery cooling circuit when the vehicle has air-conditioning refrigeration needs and battery cooling needs, thereby avoiding the problem of poor air-conditioning cooling effect caused by a large opening of the electronic valve.

[0088] The battery cooling method is described in detail below in conjunction with specific embodiments.

[0089] See also Figure 4 , is a schematic structural diagram of another battery cooling system provided in an embodiment of the present invention.

[0090] like Figure 4As shown, the battery cooling circuit 2 may further include: a battery water pump 22, a battery liquid cooling plate 23 and a compensation water bottle 24. The battery water pump 22 is connected to the battery liquid cooling plate 23 and the compensation water bottle 24 in sequence.

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

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

[0093] The compensating kettle 24 is specifically used to provide coolant to the battery cooling circuit 2 , thereby ensuring that the coolant in the battery cooling circuit is sufficient.

[0094] In a specific application scenario, when the vehicle has a battery cooling requirement, the battery water pump starts, and the coolant circulates in the battery cooling circuit 2. After the coolant enters the battery liquid cooling plate, the temperature of the battery liquid cooling plate decreases, thereby absorbing the heat of the battery and cooling the battery. At the same time, the compressor 11 in the air conditioning refrigeration circuit 1 starts to provide refrigerant for the battery cooling circuit 2. The refrigerant enters the battery cooler through the electronic valve. Figure 4 In the battery cooler, a refrigerant side and a coolant side are provided. The refrigerant of the air conditioning refrigeration circuit enters the refrigerant side of the battery cooler through an electronic valve. The coolant flowing out of the battery liquid cooling plate enters the coolant side of the battery cooler and exchanges heat with the refrigerant on the refrigerant side. After the heat exchange, the coolant temperature is reduced and re-enters the battery liquid cooling plate through the battery water pump for battery cooling.

[0095] like Figure 4 A water temperature sensor may also be provided between the battery water cooling and the battery liquid cooling plate, specifically for obtaining the actual temperature of the coolant at the battery water inlet.

[0096] Similarly, the refrigerant after heat exchange re-enters the air conditioning refrigeration circuit for circulation. 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 used to obtain the actual outlet superheat of the refrigerant outlet of the battery cooler.

[0097] See also Figure 5 , is a flow chart of another battery cooling method provided by an embodiment of the present invention. The method is applied to the control module 3. The control module 3 includes a second proportional-integral (PI) module for calculating the opening of the electronic valve.

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

[0099] Step 201: The control module 3 obtains a first battery cell temperature of the battery.

[0100] Step 202: The control module 3 determines whether the first battery cell temperature is greater than the battery cell cooling threshold. If the first battery cell temperature is greater than the battery cell cooling threshold, continue to step 203. If the first battery cell temperature is less than the battery cell cooling threshold, jump to step 222 and do not cool the battery.

[0101] Step 203: If the first battery cell temperature is greater than the battery cell cooling threshold, the control module 3 determines whether the vehicle has an air conditioning cooling demand. If there is an air conditioning cooling demand, continue to step 204. If there is no air conditioning cooling demand, jump to step 213.

[0102] Step 204: If yes, the control module 3 obtains the current second battery cell temperature of the battery in real time.

[0103] Step 205: The control module 3 determines whether the second battery cell temperature is greater than the battery cell limit threshold. If the second battery cell temperature is less than the battery cell limit threshold, continue to step 206. If the second battery cell temperature is greater than the battery cell limit threshold, jump to step 213.

[0104] Step 206: If the second battery cell temperature is less than the battery cell limit threshold, the control module 3 starts timing and performs primary battery cooling.

[0105] Step 207 : The control module 3 determines a first opening value according to the timing time and the opening variation cycle of the electronic valve.

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

[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 close and suspends cooling of the battery.

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

[0110] Step 212: The control module 3 adjusts the opening of the electronic valve to the target opening, so that the refrigerant of the air-conditioning refrigeration circuit flows into the battery cooler through the electronic valve and cools 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 limit threshold, the control module 3 performs secondary battery cooling to obtain the actual outlet overheat of the battery cooler in real time.

[0112] Step 214: The control module 3 obtains a third difference between the actual outlet superheat and the target outlet superheat.

[0113] Step 215: The control module 3 performs proportional integral calculation on the third difference through the second PI module to determine the second opening of the electronic valve.

[0114] Step 216 : The control module 3 adjusts the opening of the electronic valve to the second opening, so that the refrigerant of the air-conditioning refrigeration circuit flows into the battery cooler through the electronic valve to cool the battery.

[0115] Step 217: The control module 3 determines whether the actual outlet superheat reaches the target outlet superheat.

[0116] Step 218: If reached, 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 experimental tests. When the opening of the electronic valve is within the target opening range, the battery cooling and the air conditioning refrigeration 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, which are not limited in the embodiment of the present invention.

[0117] Step 219: The control module 3 obtains the third battery cell temperature of the battery in real time.

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

[0119] In this embodiment, the target cell temperature may be the cell temperature of the battery in good working condition obtained through a large number of tests. It is understandable that the target cell temperature may be determined according to the cell cooling threshold. The target cell temperature is less than or equal to the cell cooling threshold. Of course, it may also be set according to the situation, and this embodiment does not limit it.

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

[0121] The battery cooling method provided in an embodiment of the present invention periodically adjusts the opening of the electronic valve to adjust the flow rate of the refrigerant distributed from the air-conditioning refrigeration circuit to the battery cooling circuit when the vehicle has air-conditioning refrigeration needs and battery cooling needs, thereby avoiding the problem of poor air-conditioning cooling effect caused by a large opening of the electronic valve.

[0122] See also Figure 6, is a flow chart of a method for providing refrigerant in an air conditioning refrigeration circuit according to an embodiment of the present invention. The method is applied to the control module 3. The control module 3 includes a first proportional integral PI module for calculating the speed of the compressor.

[0123] like Figure 6 As shown, the processing steps of the method may include:

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

[0125] Step 302: The control module 3 performs proportional integral calculation on the second difference according to the first PI module to determine the first rotation speed of the compressor.

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

[0127] Step 304: The control module 3 uses the sum of the first speed and the second speed as the target speed of the compressor.

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

[0129] In this embodiment, when the vehicle is performing air conditioning refrigeration and battery cooling, the refrigerant flow rate of the air conditioning refrigeration circuit is adjusted by adjusting the speed of the compressor. Without using a 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 FIG. 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Figure 7 As shown, the electronic device may include at least one processor; and at least one memory connected to the processor in communication, wherein: the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the embodiments of the present invention. Figure 1-Figure 6 The illustrated embodiment provides a battery cooling method.

[0131] The electronic device may be a device capable of controlling an air conditioning refrigeration circuit and a battery cooling circuit. The embodiment of the present invention does not limit the specific form of the electronic device. It is understandable that the electronic device here is the machine mentioned in the method embodiment.

[0132] Figure 7 A block diagram of an exemplary electronic device suitable for implementing an exemplary embodiment of the present invention is shown. Figure 7The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0133] like Figure 7 As shown, the electronic device is in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: one or more processors 410, memory 430, and a communication bus 440 connecting different system components (including memory 430 and 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 port, a processor or a local bus using any of a variety of bus structures. For example, these architectures include but are not limited to Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus and Peripheral Component Interconnection (PCI) bus.

[0135] Electronic devices typically include a variety of computer system readable media. These media can be any available media that can be accessed by the electronic device, including volatile and non-volatile media, removable and non-removable media.

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

[0137] A program / utility having a set (at least one) of program modules may be stored in memory 430, such program modules including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules generally perform the functions and / or methods of the embodiments described in the embodiments of the present invention.

[0138] The processor 410 executes various functional applications and data processing by running the programs stored in the memory 430, such as implementing the embodiments of the present invention. Figure 1-Figure 6 The illustrated embodiment provides a battery cooling method.

[0139] An embodiment of the present invention provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions, wherein the computer instructions enable the computer to execute an embodiment of the present invention. Figure 1-Figure 6 The illustrated embodiment provides a battery cooling method.

[0140] The above-mentioned non-transitory computer-readable storage medium can adopt any combination of one or more computer-readable media. The computer-readable medium 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 electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (Read Only Memory; hereinafter referred to as: ROM), an erasable programmable read-only memory (Erasable Programmable Read Only Memory; hereinafter referred to as: EPROM) or flash memory, optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0141] Computer-readable signal media may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the foregoing. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0142] Program code embodied on a computer readable medium may 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] The computer program code for performing the operation of the embodiments of the present invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (Local Area Network; hereinafter referred to as: LAN) or a wide area network (Wide Area Network; hereinafter referred to as: WAN), or can be connected to an external computer (for example, using an Internet service provider to connect through the Internet).

[0144] The above describes specific embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0145] In the description of the embodiments of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In the embodiments of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in the embodiments of the present invention and the features of the different embodiments or examples, without contradiction.

[0146] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0147] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred implementation of the embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0148] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0149] It should be noted that the terminals involved in the embodiments of the present invention may include but are not limited to personal computers (Personal Computer; hereinafter referred to as: PC), personal digital assistants (Personal Digital Assistant; hereinafter referred to as: PDA), wireless handheld devices, tablet computers (Tablet Computer), mobile phones, MP3 players, MP4 players, etc.

[0150] In the several embodiments provided in the embodiments of the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0151] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0152] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (Processor) to perform some steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk and other media that can store program codes.

[0153] The above description is only a preferred embodiment of the embodiment of the present invention and is not intended to limit the embodiment of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiment of the present invention should be included in the scope of protection of the embodiment of the present invention.

Claims

1. A battery cooling method, characterized in that: The method is applied to a battery cooling system, which includes: 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 connected to a battery cooler, and an electronic valve is provided on the connection path between the air conditioning refrigeration circuit and the battery cooler; the control module executes the method, including: When it is detected that the temperature of the first battery cell of the battery is greater than the battery cell cooling threshold and the vehicle has air conditioning cooling demand, the current temperature of the second battery cell of the battery is obtained; If the temperature of the second battery cell is less than the battery cell limit threshold, the timing is started and the first-level battery cooling is performed, wherein the first-level battery cooling includes: Determining a first opening value according to the timing time and the opening change cycle of the electronic valve; Determining a first opening compensation value according to a difference between an actual refrigeration temperature and a target refrigeration temperature of the air-conditioning refrigeration circuit; determining a target opening of the electronic valve according to the first opening value and the first opening compensation value; The opening of the electronic valve is adjusted to the target opening so that the refrigerant of the air-conditioning refrigeration circuit flows into the battery cooler through the electronic valve and cools the battery.

2. The method according to claim 1, characterized in that Determining the target opening of the electronic valve according to the first opening value and the first opening compensation value includes: A first difference between the first opening value and the first opening compensation value is used as the target opening of the electronic valve.

3. The method according to claim 2, characterized in that The method of using a first difference between the first opening value and the first opening compensation value as the target opening of the electronic valve further includes: If the first opening value is less than or equal to the first opening compensation value, the electronic valve is controlled to close, and the cooling of the battery is suspended.

4. The method according to claim 1, characterized in that: The air conditioning refrigeration circuit includes a compressor; the battery cooling circuit includes a battery liquid cooling plate, and a water temperature sensor is connected to the battery water inlet of the battery liquid cooling plate to obtain the actual temperature of the battery water inlet; the control module includes a first proportional integral PI module, which is used to determine the speed of the compressor corresponding to reducing the actual temperature of the battery water inlet to the target temperature; After detecting that the first battery cell temperature of the battery is greater than the battery cell cooling threshold and the vehicle has an air conditioning cooling demand, the method further includes: Acquire in real time a second difference between the actual temperature of the battery water inlet and the target temperature; According to the first PI module, performing proportional integral calculation on the second difference to determine a first speed of the compressor; determining a second speed of the compressor according to the target refrigeration temperature; taking the sum of the first speed and the second speed as the target speed of the compressor; The rotation speed of the compressor is adjusted to the target rotation speed so as to cool the battery through the refrigerant.

5. The method according to claim 1, characterized in that The battery cooler is provided with a refrigerant outlet; the refrigerant outlet is connected to a temperature and pressure sensor for obtaining an actual outlet superheat of the battery cooler; the control module includes a second PI module for determining an opening of the electronic valve corresponding to reducing the actual outlet superheat of the battery cooler to a target outlet superheat; If the vehicle does not have the air conditioning cooling demand, or if the second battery cell temperature is greater than the limit temperature threshold, performing secondary battery cooling; Wherein, the secondary cooling of the battery comprises: acquiring in real time a third difference between the actual outlet superheat and the target outlet superheat; According to the second PI module, performing proportional integral calculation on the third difference to determine a second opening degree of the electronic valve; The opening of the electronic valve is adjusted to the second opening so that the refrigerant of the air conditioning 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.

6. The method according to claim 5, characterized in that After the actual outlet superheat reaches the target outlet superheat, the method further includes: The opening of the electronic valve is controlled within a target opening range.

7. The method according to claim 1, characterized in that After the battery is cooled, the method further includes: detecting a third battery cell temperature of the battery in real time, and determining whether the third battery cell temperature is less than or equal to a target battery cell temperature, wherein the target battery cell temperature is 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, the electronic valve is controlled to close to stop cooling the battery.

8. A battery cooling system, characterized in that: It 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 connected to a battery cooler, and an electronic valve is provided on the connection path between the air-conditioning refrigeration circuit and the battery cooler; the control module is used to execute the battery cooling method as described in any one of claims 1 to 7.

9. An electronic device, characterized in that: include: at least one processor; as well as at least one memory in communication with the processor, wherein: The memory stores program instructions executable by the processor, and the processor can execute the method according to any one of claims 1 to 7 by calling the program instructions.

10. A non-transitory computer-readable storage medium, characterized in that: The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the method according to any one of claims 1 to 7.

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