Diagnostic methods, devices, storage media, and electronic equipment for battery cooling capacity

Abstract

This disclosure provides a method, apparatus, storage medium, and electronic device for diagnosing battery cooling capacity. The diagnostic method includes: performing a first-level cooling capacity diagnosis of the battery cooling system when the vehicle and its environment meet a first preset condition; and performing a second-level cooling capacity diagnosis of the battery cooling system after performing the first-level cooling capacity diagnosis, when the vehicle and its environment meet a second preset condition. This disclosure identifies whether the above two levels of cooling capacity are functioning normally or are in a limited state before the battery temperature reaches a cooling threshold, thereby taking preventative measures in advance to prevent a rapid rise in battery temperature and a rapid decrease in charge / discharge capacity due to limited system cooling capacity when the battery actually reaches the cooling threshold. This not only minimizes the potential risk of this fault but also avoids the risk of power interruption during driving.

Description

Technical Field

[0001] This invention relates to the field of battery diagnostic technology, and in particular to a method, apparatus, storage medium, and electronic device for diagnosing battery cooling capacity. Background Technology

[0002] In electric vehicle thermal management systems, the cooling capacity of the battery cooling system is crucial to battery performance and overall vehicle power performance. However, current battery cooling systems only activate cooling after the battery temperature reaches a cooling temperature threshold. If the cooling capacity of the battery cooling system is limited at this point, it will directly lead to a rapid rise in battery temperature and a rapid decline in charge and discharge performance. The consequence is a sudden limitation in the battery's output power. Current technology cannot predict the cooling capacity of the battery cooling system in advance or take preventative measures to avoid the sudden drop in battery performance and overall vehicle power caused by limited cooling capacity. Summary of the Invention

[0003] The purpose of this disclosure is to provide a method, apparatus, storage medium, and electronic device for diagnosing battery cooling capacity, in order to solve the problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, the embodiments of this disclosure adopt the following technical solutions:

[0005] One aspect of this disclosure provides a method for diagnosing battery cooling capacity, comprising:

[0006] When the vehicle and its surrounding environment meet the first preset conditions, perform the first-level cooling capacity diagnosis of the battery cooling system.

[0007] After performing the first-level cooling capacity diagnosis, if the vehicle and its environment meet the second preset conditions, the second-level cooling capacity diagnosis of the battery cooling system is performed.

[0008] In some embodiments, performing a first-level cooling capacity diagnosis of the battery cooling system when the vehicle and its environment meet a first preset condition includes:

[0009] The ambient temperature of the vehicle's environment, the battery temperature of the vehicle, and the motor temperature of the vehicle are obtained.

[0010] When the ambient temperature is greater than a first preset threshold, the battery temperature is greater than the ambient temperature but less than a second preset threshold, and the motor temperature is less than a third preset threshold, the predetermined component is controlled to enter a first diagnostic state.

[0011] Perform the first-level cooling capacity diagnostic.

[0012] In some embodiments, performing the first-level cooling capacity diagnosis includes:

[0013] The difference in battery temperature at time t2 relative to time t1 is less than the first preset temperature difference, indicating that the first-stage cooling capacity of the battery cooling system is limited.

[0014] If the difference in battery temperature at time t2 relative to time t1 is greater than or equal to the first preset temperature difference, it indicates that the first-stage cooling capacity of the battery cooling system is normal.

[0015] In some embodiments, after performing the first-level cooling capacity diagnosis, when the vehicle and its surrounding environment meet a second preset condition, performing the second-level cooling capacity diagnosis of the battery cooling system includes:

[0016] When the ambient temperature is greater than a first preset threshold, the battery temperature is greater than the ambient temperature but less than a second preset threshold and greater than a preset heating threshold, the battery cooling system has no serious faults, and there is no request for air conditioning cooling in the passenger cabin, the predetermined component is controlled to enter the second diagnostic state.

[0017] Perform a judgment on the second level of cooling capacity.

[0018] In some embodiments, performing the second-level cooling capacity diagnostic includes:

[0019] When the difference in battery temperature at time t4 relative to time t3 is greater than the second preset temperature difference but less than the third preset temperature difference, it indicates that the second-stage cooling capacity of the battery cooling system is in a moderately limited state.

[0020] When the difference in battery temperature at time t4 relative to time t3 is less than or equal to the second preset temperature difference, it indicates that the second-stage cooling capacity of the battery cooling system is severely limited.

[0021] When the temperature difference between the battery at time t4 and time t3 is greater than or equal to the third preset temperature difference, it indicates that the second-stage cooling capacity of the battery cooling system is normal.

[0022] In some embodiments, when the second-stage cooling capacity of the battery cooling system is moderately limited, and the battery temperature is greater than or equal to a second preset threshold and the passenger compartment requests air conditioning, the maximum charge / discharge capacity of the battery is limited in advance to a previously predetermined first percentage.

[0023] In some embodiments, when the second-stage cooling capacity of the battery cooling system is severely limited, when the battery temperature is greater than or equal to a second preset threshold, the maximum charge / discharge capacity of the battery is limited to a previously predetermined second percentage.

[0024] Another aspect of this disclosure provides a diagnostic device for battery cooling capacity, comprising:

[0025] The first execution module is used to perform the first-level cooling capacity diagnosis of the battery cooling system when the vehicle and the surrounding environment meet the first preset conditions.

[0026] The second execution module is used to perform a second-level cooling capacity diagnosis of the battery cooling system after performing the first-level cooling capacity diagnosis, provided that the vehicle and its environment meet the second preset conditions.

[0027] Another aspect of this disclosure provides a storage medium storing a computer program that, when executed by a processor, implements the steps of any of the methods described above.

[0028] Another aspect of this disclosure provides an electronic device, including at least a memory and a processor, wherein the memory stores a computer program, characterized in that the processor, when executing the computer program in the memory, implements the steps of any of the methods described above.

[0029] This disclosure embodiment is used to pre-diagnose the first-stage and second-stage cooling capabilities of a vehicle's battery cooling system. That is, before the battery temperature reaches the cooling threshold, it identifies whether the two-stage cooling capabilities are functioning normally or in a limited state, thereby taking preventive measures in advance to prevent the battery temperature from rising rapidly and the charging and discharging capabilities from decreasing rapidly due to the limited system cooling capacity when the battery actually reaches the cooling threshold. In this way, not only is the potential risk of this fault minimized, but the risk of power interruption during the driver's driving is also avoided. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the thermal management system to which the battery cooling capacity diagnostic method provided in this embodiment of the disclosure is applicable;

[0032] Figure 2 This is a schematic diagram of the steps of the method for diagnosing battery cooling capacity provided in the embodiments of this disclosure;

[0033] Figure 3 This is a schematic diagram of the steps of the method for diagnosing battery cooling capacity provided in the embodiments of this disclosure;

[0034] Figure 4 This is a schematic diagram of the steps of the method for diagnosing battery cooling capacity provided in the embodiments of this disclosure. Detailed Implementation

[0035] Various embodiments and features of this disclosure are described herein with reference to the accompanying drawings.

[0036] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this disclosure will be apparent to those skilled in the art.

[0037] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

[0038] These and other features of this disclosure will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0039] It should also be understood that although this disclosure has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this disclosure, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0040] The above and other aspects, features and advantages of this disclosure will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0041] Specific embodiments of this disclosure are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this disclosure, which may be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure this disclosure. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use this disclosure in a variety of substantially any suitable detailed structures.

[0042] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this disclosure.

[0043] The first embodiment of this disclosure provides a method for diagnosing battery cooling capacity, where battery cooling capacity refers to the ability of a battery cooling system on a vehicle to cool the battery. The diagnostic method can diagnose the battery cooling capacity in advance. This diagnostic method is applicable to… Figure 1 The thermal management system of the pure electric vehicle shown includes a first cycle as a motor cooling circuit, consisting of a motor 1, a first pump 2, a radiator 3, and a DC-DC converter 4 connected in sequence. The outlet of the radiator 3 is connected to its inlet via a first water valve 15. The outlet of the first pump 2 is connected to the inlet of the first water valve 15 via a pipeline. A second water valve 14, a third water valve 13, and a fifth water valve 8 are installed on the pipeline. The third water valve 13 is connected in sequence to a heat exchanger 10, a PTC heater 11, and a second pump 12 to form a second cycle as a PTC heating circuit. The fifth water valve 8 is connected in sequence to a battery 5, a cooler 6, a fourth water valve 9, and a third pump 7 to form a third cycle as a battery cooling circuit. The heat exchanger 10 is connected to the fourth water valve 9. This embodiment is also applicable to thermal management systems for other types of pure electric vehicles.

[0044] like Figure 2 As shown, the diagnostic method includes:

[0045] S101, when the vehicle and its environment meet the first preset conditions, perform the first-level cooling capacity diagnosis of the battery cooling system.

[0046] In this step, when the vehicle and its surrounding environment meet the first preset conditions, a first-level cooling capacity diagnosis of the battery cooling system is performed. Specifically, when the relevant parameters of the vehicle and its surrounding environment meet certain conditions, a first-level cooling capacity diagnosis is performed on the vehicle's battery cooling system. Specifically, as follows... Figure 2 As shown, it includes:

[0047] S201, obtain the ambient temperature of the vehicle's environment, the battery temperature of the vehicle, and the motor temperature of the vehicle.

[0048] In this step, the ambient temperature of the vehicle's surroundings, the vehicle's battery temperature, and the vehicle's motor temperature are acquired. This step obtains the vehicle's temperature status by collecting temperatures from various external and internal components of the vehicle. Specifically, for example, the ambient temperature is collected using a temperature sensor located on the vehicle's body, the battery temperature is collected using a temperature sensor located inside the battery, and the motor temperature is collected using a temperature sensor located inside the motor.

[0049] S202. When the ambient temperature is greater than the first preset threshold, the battery temperature is greater than the ambient temperature and less than the second preset threshold, and the motor temperature is less than the third preset threshold, control a predetermined component to enter the first diagnostic state.

[0050] After obtaining the ambient temperature of the environment where the vehicle is located, the battery temperature of the vehicle, and the motor temperature of the vehicle through the above step S201, in this step, when the ambient temperature is greater than the first preset threshold, the battery temperature is greater than the ambient temperature and less than the second preset threshold, and the motor temperature is less than the third preset threshold, control a predetermined component to enter the first diagnostic state.

[0051] In this step, it is judged whether it is necessary to diagnose the first-stage cooling capacity of the battery cooling system by collecting the temperature parameters of the environment and inside the vehicle. Specifically, to judge whether the vehicle enters the diagnostic state of the first-stage cooling capacity, it is necessary to judge whether the above three temperature parameters meet the corresponding preset conditions. For example, it is necessary to meet that the ambient temperature where the vehicle is located, that is, T_env > (T1 + ΔT1). That is, here the T_env needs to be greater than the preset threshold, and the preset threshold here is represented by T1 + ΔT1. Here, T1 is set to 10 degrees, for example. When the ambient temperature is less than or equal to the above preset threshold, it means that there is no cooling request for the battery in the vehicle.

[0052] At the same time, the battery temperature of the vehicle also needs to satisfy the following relationship: T_env + ΔT_env < battery temperature, that is, T_battery < T2 - ΔT2. The above means that when the battery reaches a certain temperature, it means that the battery needs to start considering performing the first-stage cooling. It is also necessary that the motor temperature of the vehicle, that is, T_motor < T3 - ΔT3, that is, it is necessary to meet that the temperature of the motor cannot be too high. If the motor temperature is greater than the above preset threshold, it means that the motor temperature is too high, and then the output power / capability of the motor is restricted. Among them, the above ΔT1, ΔT_env, ΔT2, and ΔT3 are all used for hysteresis processing and are generally set to 2 degrees.

[0053] When the vehicle simultaneously meets the above three conditions, it is judged that the first-stage cooling capacity of the battery cooling system can be diagnosed currently. Of course, when any one of the above temperature values meets the predetermined condition, the diagnostic condition for the first-stage cooling capacity can also be exited. Among them, in one embodiment, when any of the following conditions is met, the diagnosis is exited. For example, the ambient temperature, that is, T_env <= T1 and / or the battery temperature, that is, T_battery <= T_env and / or the battery temperature, that is, T_battery >= T2 and / or the motor temperature T_motor >= T3.

[0054] Furthermore, when the vehicle meets the above conditions, it meets the conditions for diagnosing the first-level cooling capacity. In addition, before the diagnosis is performed, the predetermined control component needs to enter the first diagnostic state. The predetermined component here includes, for example, at least one of the following: control battery cooling circuit, motor cooling circuit, PTC heating circuit, radiator, and cooling fan.

[0055] In this step, specifically, such as Figure 1 As shown, for example, this includes controlling the third water pump 3 in the battery cooling circuit and the first water pump 2 in the motor cooling circuit to operate at their maximum duty cycle; then closing the water valve switch connecting the battery cooling circuit and the PTC heating circuit, i.e., the water-to-water heat exchanger; next, opening the fifth water valve 8 and the second water valve 14 to connect the battery cooling circuit and the motor cooling circuit; finally, keeping the motor cooling circuit connected to the radiator 3, i.e., opening the first water valve 15 and turning on the cooling fan to operate at its maximum duty cycle.

[0056] S203, perform the first level of cooling capacity diagnosis.

[0057] After controlling the predetermined component to enter the first diagnostic state through the above step S202, the first-level cooling capacity is determined in this step.

[0058] Specifically, when the diagnosis of the first-level cooling capacity of the battery cooling system begins, the running command is issued as time 0. Time t1 is first passed to ensure that the battery cooling system enters the working state. Here, t1 represents the time from when the water valve, water pump, fan, etc. in the battery cooling system receive the start command to when they are working normally. Generally, t1 is set to no more than 3 seconds.

[0059] After time t2, if the temperature difference between the battery and time t1 is less than the first preset temperature difference, i.e., (Tbattery t1 - Tbattery t2) < (first preset temperature difference ΔT1 - ΔT offset), it indicates that the first-stage cooling capacity of the battery cooling system is limited. This alerts the vehicle's thermal management control unit in advance. When the battery requires cooling, the system then recommends not activating the first-stage cooling and directly switching to the second-stage forced cooling. The first preset temperature difference ΔT1 is obtained during early vehicle development through vehicle thermal management testing. It represents the rate at which the battery should achieve a temperature reduction under specific ambient temperature, battery temperature, motor temperature, vehicle speed, and motor / battery charging / discharging power, provided the first-stage cooling capacity is normal. When (Tbattery t1 - Tbattery t2) >= the first preset temperature difference ΔT1, it indicates that the first-stage cooling capacity of the battery cooling system is normal.

[0060] S102, after performing the first-level cooling capacity diagnosis, if the vehicle and its environment meet the second preset conditions, perform the second-level cooling capacity diagnosis of the battery cooling system.

[0061] After performing the first-level cooling capacity diagnosis of the battery cooling system in step S101, in this step, after performing the first-level cooling capacity diagnosis, if the vehicle and its surrounding environment meet a second preset condition, a second-level cooling capacity diagnosis of the battery cooling system is performed. Specifically, if the relevant parameters of the vehicle and its surrounding environment meet certain conditions, a second-level cooling capacity diagnosis is performed on the vehicle's battery cooling system. This second-level cooling is also known as forced cooling, specifically, as... Figure 3 As shown, it includes:

[0062] S301, when the ambient temperature is greater than a first preset threshold, the battery temperature is greater than the ambient temperature but less than a second preset threshold and greater than a preset heating threshold, the battery cooling system has no serious faults, and there is no request for air conditioning cooling in the passenger cabin, the predetermined component is controlled to enter the second diagnostic state.

[0063] In this step, after the first-level cooling capacity diagnosis is completed, the ambient and vehicle interior temperature parameters are collected to determine whether a second-level cooling capacity diagnosis of the battery cooling system is needed. Specifically, determining whether the vehicle enters the second-level cooling capacity diagnosis state requires checking whether the above three temperature parameters meet the corresponding preset conditions. For example, the ambient temperature where the vehicle is located must be greater than (T1 + ΔT1), meaning that T_ambienterable must be greater than a preset threshold, which is represented by T1 + ΔT1, where T1 is set to, for example, 10 degrees Celsius. If the ambient temperature is less than or equal to the preset threshold, it indicates that the battery in the vehicle does not require cooling.

[0064] Simultaneously, the vehicle's battery temperature must meet the following relationship: (Theating + ΔTheating) < battery temperature Tbattery < (T2 - ΔT2), where Theating refers to the battery's performance being severely limited below this temperature, requiring heating to raise its temperature. Furthermore, the battery cooling system must be free of serious malfunctions (such as compressor failure / refrigerant leakage or insufficiency); and there must be no request for passenger compartment air conditioning cooling.

[0065] If the vehicle meets all of the above conditions, it is determined that the second-level cooling capacity of the battery cooling system can be diagnosed at present.

[0066] Of course, the diagnostic conditions for the second-level cooling capacity can be exited if any of the above temperature values ​​meet the predetermined conditions. In one embodiment, the diagnosis is exited when any of the following conditions are met: the first-level cooling capacity diagnosis is not completed, the ambient temperature Tambient <= T1, the battery temperature Tbattery <= Theating, the battery temperature Tbattery >= T2, the cooling system has a serious malfunction, or there is a request for air conditioning cooling in the crew cabin.

[0067] Furthermore, when the vehicle meets the above conditions, it meets the conditions for diagnosing the first-level cooling capacity. In addition, before the diagnosis is performed, the predetermined control component needs to enter the second diagnostic state. The predetermined component here includes, for example, at least one of the following: control battery cooling circuit, motor cooling circuit, PTC heating circuit, and compressor.

[0068] Specifically, this step includes, for example, controlling the first water pump 2 in the battery cooling circuit to operate at its maximum duty cycle, then closing the fourth water valve 9, which connects the battery cooling circuit and the PTC heating circuit to the heat exchanger 10, and then closing the fifth water valve 8 and the second water valve 14, which connect the battery cooling circuit and the motor cooling circuit; finally, sending a request to the air conditioner for the highest level of forced battery cooling, i.e., controlling the compressor to operate at its maximum power.

[0069] S302, performs the second-level cooling capacity assessment.

[0070] After controlling the predetermined component to enter the second diagnostic state through the above step S202, the second-level cooling capacity is determined in this step.

[0071] Specifically, when the diagnosis of the first-stage cooling capacity of the battery cooling system begins, the running command is issued as time 0. Time t3 is first passed to ensure that the battery cooling system enters the working state. Here, t3 represents the time from when the water valve, water pump and compressor in the battery cooling system receive the start command to when they are working normally. Generally, t3 is set to no more than 10 seconds.

[0072] After time t4, if the difference in battery temperature at time t4 relative to time t3 is greater than the second preset temperature difference and less than the third preset temperature difference, i.e., the second preset temperature difference ΔT2 < (T_battery_t3 - T_battery_t4) < (the third preset temperature difference ΔT3 - ΔT_offset), it indicates that the second-stage cooling capacity of the battery cooling system is in a moderately limited state. Furthermore, when the battery temperature T_battery >= T2 and the passenger cabin has an air conditioning cooling request, it is necessary to limit the maximum charge and discharge capacity of the battery to the previous first predetermined percentage at a lower rate of decrease and store a fault code.

[0073] When the difference in battery temperature at time t4 relative to time t3 is less than or equal to the second preset temperature difference, i.e., (Tbatteryt3 - Tbatteryt4) = < (second preset temperature difference ΔT2 - ΔT offset), it indicates that the second-stage cooling capacity of the battery cooling system is severely limited. Furthermore, when the battery temperature Tbattery >= T2, it is necessary to limit the maximum charge and discharge capacity of the battery to the previous second predetermined percentage at a lower rate of decrease in advance to prevent the battery from generating too much heat when fully outputting, which would lead to excessive temperature rise. At the same time, the driver should be alerted through the instrument panel or other means that the battery cooling capacity is severely limited and needs to be checked and repaired.

[0074] When the temperature difference between the battery at time t4 and time t3 is greater than or equal to the third preset temperature difference, i.e. (T_battery_t3 - T_battery_t4) >= the third preset temperature difference ΔT3, it indicates that the second-stage cooling capacity of the battery cooling system is normal.

[0075] The third preset temperature difference ΔT3 here was obtained through vehicle thermal management tests during early development. It represents the temperature cooling rate that the battery should achieve under certain ambient temperature, battery temperature, motor temperature, vehicle speed, and motor / battery charging / discharging power conditions, when the battery cooling system is in normal operation with its second-level cooling capacity. The second preset temperature difference ΔT2 here is the temperature cooling rate at which the battery maintains its minimum cooling requirement under the same conditions as the third preset temperature difference ΔT3.

[0076] This disclosure embodiment is used to pre-diagnose the first-stage and second-stage cooling capabilities of a vehicle's battery cooling system. That is, before the battery temperature reaches the cooling threshold, it identifies whether the two-stage cooling capabilities are functioning normally or in a limited state, thereby taking preventive measures in advance to prevent the battery temperature from rising rapidly and the charging and discharging capabilities from decreasing rapidly due to the limited system cooling capacity when the battery actually reaches the cooling threshold. In this way, not only is the potential risk of this fault minimized, but the risk of power interruption during the driver's driving is also avoided.

[0077] Based on the same inventive concept as the first embodiment described above, the second embodiment of this disclosure provides a diagnostic device for battery cooling capacity, comprising a first execution module and a second execution module coupled to each other, wherein:

[0078] The first execution module is used to perform the first-level cooling capacity diagnosis of the battery cooling system when the vehicle and the surrounding environment meet the first preset conditions.

[0079] The second execution module is used to perform a second-level cooling capacity diagnosis of the battery cooling system after performing the first-level cooling capacity diagnosis, provided that the vehicle and its environment meet the second preset conditions.

[0080] Further, the first execution module includes:

[0081] The acquisition unit is used to acquire the ambient temperature of the environment where the vehicle is located, the battery temperature of the vehicle, and the motor temperature of the vehicle.

[0082] A first state control unit is used to control a predetermined component to enter a first diagnostic state when the ambient temperature is greater than a first preset threshold, the battery temperature is greater than the ambient temperature but less than a second preset threshold, and the motor temperature is less than a third preset threshold.

[0083] The first diagnostic execution unit is used to perform the first-level cooling capacity diagnosis.

[0084] Furthermore, the first diagnostic execution unit is specifically used for:

[0085] The difference in battery temperature at time t2 relative to time t1 is less than the first preset temperature difference, indicating that the first-stage cooling capacity of the battery cooling system is limited.

[0086] If the difference in battery temperature at time t2 relative to time t1 is greater than or equal to the first preset temperature difference, it indicates that the first-stage cooling capacity of the battery cooling system is normal.

[0087] Furthermore, the second execution module includes:

[0088] The second state control unit is used to control a predetermined component to enter a second diagnostic state when the ambient temperature is greater than a first preset threshold, the battery temperature is greater than the ambient temperature and less than a second preset threshold and greater than a preset heating threshold, the battery cooling system has no serious faults, and there is no request for air conditioning cooling in the passenger cabin.

[0089] The second diagnostic execution unit is used to determine the second-level cooling capacity.

[0090] Furthermore, the second diagnostic execution unit is specifically used for:

[0091] When the difference in battery temperature at time t4 relative to time t3 is greater than the second preset temperature difference but less than the third preset temperature difference, it indicates that the second-stage cooling capacity of the battery cooling system is in a moderately limited state.

[0092] When the difference in battery temperature at time t4 relative to time t3 is less than or equal to the second preset temperature difference, it indicates that the second-stage cooling capacity of the battery cooling system is severely limited.

[0093] When the temperature difference between the battery at time t4 and time t3 is greater than or equal to the third preset temperature difference, it indicates that the second-stage cooling capacity of the battery cooling system is normal.

[0094] Furthermore, when the second-stage cooling capacity of the battery cooling system is moderately limited, and the battery temperature is greater than or equal to a second preset threshold and the passenger compartment requests air conditioning cooling, the second diagnostic execution unit is also used to limit the maximum charge and discharge capacity of the battery to a previously predetermined first percentage.

[0095] Furthermore, when the second-stage cooling capacity of the battery cooling system is severely limited, and the battery temperature is greater than or equal to a second preset threshold, the second diagnostic execution unit is used to limit the maximum charge / discharge capacity of the battery to a previously predetermined second percentage.

[0096] This disclosure embodiment is used to pre-diagnose the first-stage and second-stage cooling capabilities of a vehicle's battery cooling system. That is, before the battery temperature reaches the cooling threshold, it identifies whether the two-stage cooling capabilities are functioning normally or in a limited state, thereby taking preventive measures in advance to prevent the battery temperature from rising rapidly and the charging and discharging capabilities from decreasing rapidly due to the limited system cooling capacity when the battery actually reaches the cooling threshold. In this way, not only is the potential risk of this fault minimized, but the risk of power interruption during the driver's driving is also avoided.

[0097] The third embodiment of this disclosure provides a storage medium, which is a computer-readable medium storing a computer program. When executed by a processor, the computer program implements the method provided in the first embodiment of this disclosure, including the following steps S11 to S12:

[0098] S11, when the vehicle and its environment meet the first preset conditions, perform the first-level cooling capacity diagnosis of the battery cooling system.

[0099] S12, after performing the first-level cooling capacity diagnosis, if the vehicle and its environment meet the second preset conditions, perform the second-level cooling capacity diagnosis of the battery cooling system.

[0100] Furthermore, when the computer program is executed by the processor, it implements other methods provided in the first embodiment of this disclosure.

[0101] This disclosure embodiment is used to pre-diagnose the first-stage and second-stage cooling capabilities of a vehicle's battery cooling system. That is, before the battery temperature reaches the cooling threshold, it identifies whether the two-stage cooling capabilities are functioning normally or in a limited state, thereby taking preventive measures in advance to prevent the battery temperature from rising rapidly and the charging and discharging capabilities from decreasing rapidly due to the limited system cooling capacity when the battery actually reaches the cooling threshold. In this way, not only is the potential risk of this fault minimized, but the risk of power interruption during the driver's driving is also avoided.

[0102] A fourth embodiment of this disclosure provides an electronic device, which includes at least a memory and a processor. The memory stores a computer program, and the processor, when executing the computer program in the memory, implements the method provided in any embodiment of this disclosure. Exemplarily, the computer program steps of the electronic device are as follows: S21 to S22:

[0103] S21, when the vehicle and its environment meet the first preset conditions, perform the first-level cooling capacity diagnosis of the battery cooling system;

[0104] S22, after performing the first-level cooling capacity diagnosis, if the vehicle and its environment meet the second preset conditions, perform the second-level cooling capacity diagnosis of the battery cooling system.

[0105] Furthermore, the processor also executes the computer program described in the third embodiment above.

[0106] This disclosure embodiment is used to pre-diagnose the first-stage and second-stage cooling capabilities of a vehicle's battery cooling system. That is, before the battery temperature reaches the cooling threshold, it identifies whether the two-stage cooling capabilities are functioning normally or in a limited state, thereby taking preventive measures in advance to prevent the battery temperature from rising rapidly and the charging and discharging capabilities from decreasing rapidly due to the limited system cooling capacity when the battery actually reaches the cooling threshold. In this way, not only is the potential risk of this fault minimized, but the risk of power interruption during the driver's driving is also avoided.

[0107] The aforementioned storage medium may be included in the aforementioned electronic device; or it may exist independently and not be assembled into the electronic device.

[0108] The aforementioned storage medium carries one or more programs, which, when executed by the electronic device, cause the electronic device to: acquire at least two Internet Protocol (IP) addresses; send a node evaluation request including at least two IP addresses to a node evaluation device, wherein the node evaluation device selects an IP address from the at least two IP addresses and returns it; receive the IP address returned by the node evaluation device; wherein the acquired IP address indicates an edge node in the content delivery network.

[0109] Alternatively, the storage medium may carry one or more programs that, when executed by the electronic device, cause the electronic device to: receive a node evaluation request including at least two Internet Protocol (IP) addresses; select an IP address from the at least two IP addresses; and return the selected IP address; wherein the received IP address indicates an edge node in the content delivery network.

[0110] Computer program code for performing the operations of this disclosure can be written in one or more programming languages ​​or a combination thereof, including but not limited to object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the passenger's computer, partially on the passenger's computer, as a standalone software package, partially on the passenger's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer can be connected to the passenger's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0111] It should be noted that the storage medium described in this disclosure can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this disclosure, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this disclosure, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, characterized by carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any storage medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the storage medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0112] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0113] The units described in the embodiments of this disclosure can be implemented in software or in hardware. It is characterized in that the name of a unit does not, in certain circumstances, constitute a limitation on the unit itself.

[0114] The functions described above in this document can be performed at least in part by one or more hardware logic components. For example, exemplary types of hardware logic components that can be used, without limitation, include: field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), system-on-a-chip (SoCs), complex programmable logic devices (CPLDs), and so on.

[0115] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0116] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features disclosed in this disclosure that have similar functions.

[0117] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. In certain environments, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0118] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

[0119] The foregoing has provided a detailed description of several embodiments of this disclosure. However, this disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications based on the concept of this disclosure, and all such variations and modifications should fall within the scope of protection claimed by this disclosure.

Claims

1. A method for diagnosing battery cooling capacity, characterized in that, include: When the vehicle and its surrounding environment meet the first preset conditions, the first-level cooling capacity diagnosis of the battery cooling system is performed. The first-level cooling capacity diagnosis includes: the first-level cooling capacity of the battery cooling system is limited and the first-level cooling capacity of the battery cooling system is normal. The ambient temperature of the vehicle's environment, the battery temperature of the vehicle, and the motor temperature of the vehicle are obtained. When the ambient temperature is greater than a first preset threshold, the battery temperature is greater than the ambient temperature but less than a second preset threshold, and the motor temperature is less than a third preset threshold, the predetermined component is controlled to enter a first diagnostic state. Perform a first-level cooling capacity diagnostic; After performing the first-level cooling capacity diagnosis, when the vehicle and its environment meet the second preset conditions, the second-level cooling capacity diagnosis of the battery cooling system is performed. The second-level cooling capacity diagnosis includes: the second-level cooling capacity of the battery cooling system is in a moderately limited state, the second-level cooling capacity is severely limited, and the second-level cooling capacity is normal. When the ambient temperature is greater than a first preset threshold, the battery temperature is greater than the ambient temperature but less than a second preset threshold and greater than a preset heating threshold, the battery cooling system has no serious faults, and there is no request for air conditioning cooling in the passenger cabin, the predetermined component is controlled to enter the second diagnostic state. Perform a judgment on the second level of cooling capacity.

2. The diagnostic method according to claim 1, characterized in that, The first-level cooling capacity diagnosis includes: The difference in battery temperature at time t2 relative to time t1 is less than the first preset temperature difference, indicating that the first-stage cooling capacity of the battery cooling system is limited. If the difference in battery temperature at time t2 relative to time t1 is greater than or equal to the first preset temperature difference, it indicates that the first-stage cooling capacity of the battery cooling system is normal.

3. The diagnostic method according to claim 1, characterized in that, The second-level cooling capacity diagnosis includes: When the difference in battery temperature at time t4 relative to time t3 is greater than the second preset temperature difference but less than the third preset temperature difference, it indicates that the second-stage cooling capacity of the battery cooling system is in a moderately limited state. When the difference in battery temperature at time t4 relative to time t3 is less than or equal to the second preset temperature difference, it indicates that the second-stage cooling capacity of the battery cooling system is severely limited. When the temperature difference between the battery at time t4 and time t3 is greater than or equal to the third preset temperature difference, it indicates that the second-stage cooling capacity of the battery cooling system is normal.

4. The diagnostic method according to claim 3, characterized in that, When the second-stage cooling capacity of the battery cooling system is moderately limited, and the battery temperature is greater than or equal to a second preset threshold and the passenger compartment requests air conditioning, the maximum charge and discharge capacity of the battery is limited in advance to the previously predetermined first percentage.

5. The diagnostic method according to claim 3, characterized in that, When the second-stage cooling capacity of the battery cooling system is severely limited, and the battery temperature is greater than or equal to a second preset threshold, the maximum charge / discharge capacity of the battery is limited to a previously predetermined second percentage.

6. A diagnostic device for battery cooling capacity, characterized in that, include: The first execution module is used to perform a first-level cooling capacity diagnosis of the battery cooling system when the vehicle and its environment meet a first preset condition. The first-level cooling capacity diagnosis includes: the first-level cooling capacity of the battery cooling system is limited and the first-level cooling capacity of the battery cooling system is normal. The ambient temperature of the vehicle's environment, the battery temperature of the vehicle, and the motor temperature of the vehicle are obtained. When the ambient temperature is greater than a first preset threshold, the battery temperature is greater than the ambient temperature but less than a second preset threshold, and the motor temperature is less than a third preset threshold, the predetermined component is controlled to enter a first diagnostic state. The first execution module is used to perform a first-level cooling capacity diagnosis; The second execution module is used to perform a second-level cooling capacity diagnosis of the battery cooling system after performing the first-level cooling capacity diagnosis, provided that the vehicle and its environment meet the second preset conditions. The second-level cooling capacity diagnosis includes: the second-level cooling capacity of the battery cooling system is moderately limited; the second-level cooling capacity is severely limited; and the second-level cooling capacity is normal. When the ambient temperature is greater than a first preset threshold, the battery temperature is greater than the ambient temperature but less than a second preset threshold and greater than a preset heating threshold, the battery cooling system has no serious faults, and there is no request for air conditioning cooling in the passenger cabin, the predetermined component is controlled to enter the second diagnostic state. The second execution module is used to determine the second-level cooling capacity.

7. A storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

8. An electronic device, comprising at least a memory and a processor, wherein the memory stores a computer program, characterized in that, The processor implements the steps of the method according to any one of claims 1 to 5 when executing a computer program on the memory.

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