Battery pack cooling method, device, vehicle and storage medium

Abstract

This application provides a battery pack cooling method, device, vehicle, and storage medium. The method includes: when determining that a vehicle is in a charging state, obtaining the vehicle's charging data; determining the vehicle's battery pack cooling level based on the charging data; wherein different cooling levels have corresponding cooling target temperatures; and cooling the battery pack based on the cooling target temperature corresponding to the battery pack cooling level. The above method can solve the problems of long charging times and high battery pack temperatures in electric vehicles.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to a cooling method, device, vehicle and storage medium for a battery pack. Background Art

[0002] As global environmental pollution becomes increasingly serious and oil prices continue to rise, more and more users are choosing electric vehicles as their means of transportation. Charging electric vehicles is an indispensable part of using electric vehicles.

[0003] With the gradual increase in charging power of electric vehicles and the emergence of supercharging technology, battery cooling problems in different charging scenarios have gradually emerged. For example, existing electric vehicles may experience problems such as long charging time and excessive battery pack temperature during charging.

[0004] Therefore, it is extremely important to solve problems such as long charging time for electric vehicles and high battery pack temperature. Summary of the Invention

[0005] The present application provides a battery pack cooling method, device, vehicle and storage medium, which can solve the problems of long charging time and high battery pack temperature in electric vehicles.

[0006] In a first aspect, a method for cooling a battery pack is provided, the method comprising: when it is determined that a vehicle is in a charging state, obtaining charging data of the vehicle; determining a cooling level of the battery pack of the vehicle based on the charging data; wherein different cooling levels have corresponding cooling target temperatures; and cooling the battery pack based on the cooling target temperature corresponding to the cooling level of the battery pack.

[0007] In the above technical solution, by obtaining the charging data of the vehicle and determining the cooling level of the battery pack according to the charging data, the battery pack can be accurately cooled according to the cooling target temperature corresponding to different cooling levels. This can effectively avoid the problem of the charging current decreasing due to the high temperature of the battery pack, thereby avoiding the problem of the battery pack charging time being too long due to the decrease in charging current, thereby avoiding energy waste and other problems. At the same time, it can also avoid the occurrence of battery pack thermal safety issues, extend the battery life, and enhance the user experience.

[0008] In combination with the first aspect, in certain implementations of the first aspect, the charging data includes the current temperature of the battery pack and the current charge of the battery pack; determining the cooling level of the battery pack of the vehicle based on the charging data includes: determining a first comparison relationship between the current temperature of the battery pack and a preset temperature; determining a second comparison relationship between the current charge of the battery pack and a preset charge; and determining the cooling level of the battery pack of the vehicle based on the first comparison relationship and the second comparison relationship.

[0009] In the above technical solution, the current temperature and charge level of the battery pack are acquired. During vehicle charging, the charging current is higher when the battery is low, causing the battery pack temperature to rise faster; while the charging current is lower when the battery is high, causing the battery pack temperature to rise slower. Therefore, the battery pack cooling level is determined based on the comparison between the vehicle's current temperature and a preset temperature, as well as the comparison between the vehicle's current charge level and a preset charge level. By determining different cooling levels for different charge levels and temperatures of the battery pack, a more rational battery pack cooling strategy can be formulated, allowing for more precise control of the battery pack temperature to achieve optimal cooling results.

[0010] In combination with the first aspect and the above-mentioned implementation manner, in certain implementation manners of the first aspect, the method further includes: determining the type of charging pile to which the vehicle is connected; when the charging pile type is a super charging pile, the first comparison relationship is the comparison relationship between the current temperature of the battery pack and the first preset temperature; when the charging pile type is a national standard charging pile, the first comparison relationship is the comparison relationship between the current temperature of the battery pack and the second preset temperature; the first preset temperature is lower than the second preset temperature.

[0011] In combination with the first aspect and the above-mentioned implementation manner, in some implementation manners of the first aspect, the first preset temperature includes a first-level preset temperature and a second-level preset temperature, and the first-level preset temperature is less than the second-level preset temperature; the second preset temperature includes a third-level preset temperature and a fourth-level preset temperature, and the third-level preset temperature is less than the fourth-level preset temperature; and determining the cooling level of the battery pack of the vehicle according to the first comparison relationship and the second comparison relationship includes: when the first comparison relationship is that the current temperature of the battery pack is greater than the first-level preset temperature and the second comparison relationship is that the current power of the battery pack is less than or equal to the preset power, determining that the cooling level of the battery pack of the vehicle is the first cooling level. level; when the first comparison relationship is that the current temperature of the battery pack is greater than the second level preset temperature and the second comparison relationship is that the current power of the battery pack is greater than the preset power, it is determined that the cooling level of the battery pack of the vehicle is the second cooling level; when the first comparison relationship is that the current temperature of the battery pack is greater than the third level preset temperature and the second comparison relationship is that the current power of the battery pack is less than or equal to the preset power, it is determined that the cooling level of the battery pack of the vehicle is the third cooling level; when the first comparison relationship is that the current temperature of the battery pack is greater than the fourth level preset temperature and the second comparison relationship is that the current power of the battery pack is greater than the preset power, it is determined that the cooling level of the battery pack of the vehicle is the fourth cooling level.

[0012] In the above technical solution, the type of charging pile to which the vehicle is connected is first determined, and then the cooling level of the battery pack is determined based on the type of charging pile to which the vehicle is connected, the current temperature of the battery pack, and the current charge level of the battery pack. Different types of charging piles correspond to different charging currents, and the charging current of the battery pack in the later stage of charging is smaller than the charging current in the early stage of charging. The temperature change of the battery pack when charging with different charging currents is also different. The greater the current, the faster the temperature rises. Therefore, for different types of charging piles, different cooling levels are determined according to the different battery pack charges and temperatures. This can more accurately cool the battery pack, more accurately control the battery pack temperature, and ensure the safety of the battery pack cells.

[0013] In combination with the first aspect and the above-mentioned implementation methods, in certain implementation methods of the first aspect, before determining the cooling level of the battery pack of the vehicle based on the charging data, the method also includes: detecting the status of the battery pack water pump; when the status of the battery pack water pump is normal, executing the determination of the cooling level of the battery pack.

[0014] In the above technical solution, before determining the cooling level, the status of the battery pack water pump is first detected to ensure that the battery pack water pump can be used normally during the battery pack cooling process, without affecting the user's use, thereby improving the user's experience.

[0015] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, obtaining the charging data of the vehicle includes: when it is determined that the charging state is a fast charging state, obtaining the charging data of the vehicle; when it is determined that the charging state is a non-fast charging state, cooling the battery pack at a preset cooling target temperature.

[0016] In the above technical solution, the charging status of the vehicle is first determined. When the vehicle is in the fast charging state, it directly receives the DC power input by the charging pile, which causes the temperature of the battery pack to rise rapidly. At this time, it is necessary to obtain the charging data of the vehicle and cool the battery pack in time according to the obtained charging data. When the vehicle is in the non-fast charging state, it receives the converted current, so the temperature of the battery pack will not rise quickly. A target temperature can be set to cool the battery pack when it needs to be cooled. Therefore, formulating corresponding cooling strategies for both the fast charging state and the non-fast charging state can better deal with the problem of excessive battery pack temperature that needs to be solved in multiple scenarios. In the process of users charging the vehicle, regardless of whether the vehicle is in the fast charging state or the non-fast charging state, the battery pack can be cooled in time, which can better enhance the user experience.

[0017] In combination with the first aspect and the above-mentioned implementation methods, in certain implementation methods of the first aspect, after the battery pack is cooled, the method further includes: obtaining the temperature of the battery pack after cooling and the cooling exit temperature corresponding to the cooling level of the battery pack; determining whether the temperature of the battery pack after cooling reaches the cooling exit temperature; when the temperature of the battery pack after cooling reaches the cooling exit temperature, stopping cooling the battery pack; when the temperature of the battery pack after cooling does not reach the cooling exit temperature, continuing to cool the battery pack.

[0018] In the above technical solution, the battery pack's temperature after cooling is promptly acquired to determine whether it has reached the cooling exit temperature corresponding to the cooling level. Once the cooling exit temperature is reached, cooling the battery pack is stopped, avoiding the problem of slow charging due to overcooling the battery pack. This improves the user experience, ensures battery pack charging safety, and extends the battery life.

[0019] In a second aspect, a cooling device for a battery pack is provided, which includes: an acquisition module for acquiring charging data of the vehicle when it is determined that the vehicle is in a charging state; a determination module for determining a cooling level of the battery pack of the vehicle based on the charging data; wherein different cooling levels have corresponding cooling target temperatures; and a cooling module for cooling the battery pack according to the cooling target temperature corresponding to the cooling level of the battery pack.

[0020] In combination with the second aspect, in certain implementations of the second aspect, the charging data includes the current temperature of the battery pack and the current charge of the battery pack; determining the cooling level of the battery pack of the vehicle based on the charging data includes: determining a first comparison relationship between the current temperature of the battery pack and a preset temperature; determining a second comparison relationship between the current charge of the battery pack and a preset charge; and determining the cooling level of the battery pack of the vehicle based on the first comparison relationship and the second comparison relationship.

[0021] In combination with the second aspect and the above-mentioned implementation methods, in some implementation methods of the second aspect, the device also includes: a determination module for determining the type of charging pile to which the vehicle is connected; when the charging pile type is a super charging pile, the first comparison relationship is the comparison relationship between the current temperature of the battery pack and the first preset temperature; when the charging pile type is a national standard charging pile, the first comparison relationship is the comparison relationship between the current temperature of the battery pack and the second preset temperature; the first preset temperature is lower than the second preset temperature.

[0022] In combination with the second aspect and the above implementations, in certain implementations of the second aspect, the first preset temperature includes a first-level preset temperature and a second-level preset temperature, the first-level preset temperature being lower than the second-level preset temperature; the second preset temperature includes a third-level preset temperature and a fourth-level preset temperature, the third-level preset temperature being lower than the fourth-level preset temperature; and determining the cooling level of the battery pack of the vehicle based on the first comparison relationship and the second comparison relationship includes: when the first comparison relationship indicates that the current temperature of the battery pack is higher than the first-level preset temperature and the second comparison relationship indicates that the current power level of the battery pack is lower than or equal to the preset power level, determining that the cooling level of the battery pack of the vehicle is the first cooling level; When the first comparison relationship is that the current temperature of the battery pack is greater than the second-level preset temperature and the second comparison relationship is that the current power of the battery pack is greater than the preset power, it is determined that the cooling level of the battery pack of the vehicle is the second cooling level; for the national standard charging pile, when the first comparison relationship is that the current temperature of the battery pack is greater than the third-level preset temperature and the second comparison relationship is that the current power of the battery pack is less than or equal to the preset power, it is determined that the cooling level of the battery pack of the vehicle is the third cooling level; when the first comparison relationship is that the current temperature of the battery pack is greater than the fourth-level preset temperature and the second comparison relationship is that the current power of the battery pack is greater than the preset power, it is determined that the cooling level of the battery pack of the vehicle is the fourth cooling level.

[0023] In combination with the second aspect and the above-mentioned implementation methods, in certain implementation methods of the second aspect, before determining the cooling level of the battery pack of the vehicle based on the charging data, the device also includes: a detection module for detecting the status of the battery pack water pump; when the status of the battery pack water pump is normal, the determination of the cooling level of the battery pack is executed.

[0024] In combination with the second aspect and the above-mentioned implementation methods, in certain implementation methods of the second aspect, the acquisition module is specifically used to: when it is determined that the charging state is a fast charging state, obtain the charging data of the vehicle; when it is determined that the charging state is a non-fast charging state, cool the battery pack at a preset cooling target temperature.

[0025] In combination with the second aspect and the above-mentioned implementation methods, in some implementation methods of the second aspect, the device also includes: a judgment module, used to obtain the temperature of the battery pack after cooling and the cooling exit temperature corresponding to the cooling level of the battery pack; judge whether the temperature of the battery pack after cooling reaches the cooling exit temperature; when the temperature of the battery pack after cooling reaches the cooling exit temperature, stop cooling the battery pack; when the temperature of the battery pack after cooling does not reach the cooling exit temperature, continue cooling the battery pack.

[0026] In a third aspect, a vehicle is provided, comprising a memory and a processor. The memory is configured to store executable program code, and the processor is configured to retrieve and execute the executable program code from the memory, so that the vehicle executes the battery pack cooling method of the first aspect and any possible implementation of the first aspect.

[0027] In a fourth aspect, a computer program product is provided, which includes: a computer program code, which, when running on a computer, enables the computer to execute the battery pack cooling method in the above-mentioned first aspect and any possible implementation of the first aspect.

[0028] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the battery pack cooling method in the above-mentioned first aspect and any possible implementation of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic flow chart of a battery pack cooling method provided in an embodiment of the present application;

[0030] Figure 2 is a schematic flow chart of another battery pack cooling method provided in an embodiment of the present application;

[0031] Figure 3 is a schematic flow chart of a method for stopping cooling a battery pack provided in an embodiment of the present application;

[0032] Figure 4 is a schematic flow chart of a battery pack cooling logic provided in an embodiment of the present application;

[0033] Figure 5 This is a schematic diagram of a battery pack cooling system interaction provided by an embodiment of the present application;

[0034] Figure 6 This is a schematic structural diagram of a battery pack cooling device provided in an embodiment of the present application;

[0035] Figure 7 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The following will clearly and thoroughly describe the technical solutions in this application in conjunction with the accompanying drawings. In the description of the embodiments of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more than two.

[0037] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0038] With the increasing severity of global environmental pollution and rising oil prices, sales of electric vehicles are gradually increasing. Electric vehicles offer lower operating costs and a better driving experience than traditional fuel-powered vehicles. However, existing electric vehicles often experience long charging times and high battery pack temperatures, which can affect the battery life.

[0039] To address the above technical issues, embodiments of the present application provide a battery pack cooling method. The method provided in embodiments of the present application can cool battery packs in different charging scenarios. The battery pack cooling method provided in embodiments of the present application is applied to vehicles, specifically electric vehicles within a vehicle, and more specifically, the method can be applied to a controller within an electric vehicle. In embodiments of the present application, the controller can specifically be a vehicle control unit (VCU).

[0040] Figure 1 This is a schematic flow chart of a battery pack cooling method provided in an embodiment of the present application.

[0041] For example, Figure 1 As shown, the method 100 includes:

[0042] S101: When it is determined that the vehicle is in a charging state, the charging data of the vehicle is obtained.

[0043] S102: Determine a cooling level of the vehicle's battery pack based on the charging data, wherein different cooling levels have corresponding cooling target temperatures.

[0044] S103 , cooling the battery pack according to the cooling target temperature corresponding to the cooling level of the battery pack.

[0045] An embodiment of the present application provides a battery pack cooling method. When it is determined that a vehicle is in a charging state, the charging data of the vehicle is obtained; based on the charging data, the cooling level of the vehicle's battery pack is determined; wherein different cooling levels have corresponding cooling target temperatures; and the battery pack is then cooled according to the cooling target temperatures corresponding to the cooling levels of the battery pack. The above method obtains the charging data of the vehicle, determines the cooling level of the battery pack based on the charging data, and accurately cools the battery pack according to the cooling target temperatures corresponding to different cooling levels. This method can effectively avoid the problem of a reduced charging current due to an excessively high battery pack temperature, thereby avoiding the problem of a battery pack charging time being too long due to a reduced charging current, thereby avoiding energy waste and other problems. At the same time, it avoids battery thermal safety issues, extends the battery life, and enhances the user experience.

[0046] Regarding the above S101, the VCU is first used to determine whether the vehicle is in a charging state. If the vehicle is in a charging state, the charging data of the vehicle is obtained.

[0047] Exemplarily, the charging data may include the current temperature of the battery pack and the current charge level of the battery pack.

[0048] It is understandable that the current temperature of the battery pack and the current charge of the battery pack can be specifically detected by the Battery Management System (BMS). After the BMS completes the detection, it sends the detected current temperature of the battery pack and the current charge of the battery pack to the controller. The above-mentioned current temperature of the battery pack can be the maximum temperature of the battery cells of the current battery pack, and the above-mentioned current charge of the battery pack can be the current battery state of charge (SOC) of the battery pack, which refers to the available state of the remaining charge in the battery, that is, the current remaining charge of the battery. SOC is used to reflect the remaining capacity of the battery, and its numerical value is defined as the ratio of the remaining capacity to the battery capacity, usually expressed as a percentage.

[0049] Exemplarily, when it is determined that the vehicle is in a charging state, the charging state of the vehicle can be identified by the VCU, and the charging state of the vehicle can generally be divided into a fast charging state and a non-fast charging state, that is, a slow charging state. The charging state of the vehicle is related to the type of charging pile. When the charging piles are distinguished by the charging type, they can generally be divided into AC charging piles and DC charging piles. When an AC charging pile is used to charge an electric vehicle, the charging state of the vehicle can generally be referred to as a "slow charging" state, so the AC charging pile can also be referred to as a slow charging pile. When a DC charging pile is used to charge an electric vehicle, the charging state of the vehicle can generally be referred to as a "fast charging" state, so the DC charging pile can also be referred to as a fast charging pile. It can be understood that the above method can be used to cool the battery pack in the fast charging state, and can also be used to cool the battery pack in the non-fast charging state.

[0050] In one possible implementation, the above-mentioned acquisition of the vehicle's charging data may include: when it is determined that the charging state is a fast charging state, acquiring the vehicle's charging data; when it is determined that the charging state is a non-fast charging state, cooling the battery pack at a preset cooling target temperature.

[0051] For example, electric vehicles typically have two charging ports. One is a slow-charging port, also known as an AC charging port. When charging an electric vehicle via an AC charging station, AC power is input through the slow-charging port. The vehicle's onboard charger converts the AC power into DC power, which is then fed into the battery to complete the charging process. The other charging port is a fast-charging port, also known as a DC charging port. When charging an electric vehicle via a DC charging station, the station converts AC power from the grid into DC power, which is then directly fed into the electric vehicle's battery pack for charging. The difference between the two types of charging stations is that using a slow-charging station takes longer to charge but has less impact on battery life. Using a fast-charging station takes shorter charging times, but does have a negative impact on battery life. Furthermore, when charging in fast-charging mode, the vehicle directly receives DC power from the charging station, causing the battery pack to heat up rapidly. When not charging in fast-charging mode, the vehicle receives converted current, so the battery pack temperature does not rise as rapidly, allowing the battery pack to be cooled directly to the preset cooling target temperature. Therefore, the embodiment of the present application can formulate different battery pack cooling strategies for different charging states, that is, when the charging state of the vehicle is determined to be a fast charging state, the charging data of the vehicle can be obtained. When the charging state of the vehicle is determined to be a non-fast charging state, the charging data of the vehicle can be omitted, and the battery pack can be directly cooled according to the preset cooling target temperature. For example, when the charging state of the vehicle is determined to be a non-fast charging state, because the temperature of the battery pack will not be particularly high, the battery pack is directly cooled according to the preset cooling target temperature to avoid redundancy.

[0052] For example, when the VCU identifies the vehicle's charging state as slow charging, assuming the preset cooling target temperature of the battery pack in the slow charging state is 20°C, the battery pack is cooled at 20°C. That is, in the slow charging state, the battery pack can be cooled at a fixed cooling target temperature. When the VCU identifies the vehicle's charging state as fast charging, it can obtain the vehicle's charging data, such as the current temperature and current charge level of the battery pack, and then cool the battery pack based on this data.

[0053] The above technical solution develops corresponding cooling strategies for both fast-charging and non-fast-charging states, effectively addressing the urgent issue of overheating in battery packs in multiple scenarios. During the charging process, regardless of whether the vehicle is fast-charging or not, the battery pack can be cooled promptly, enhancing the user experience.

[0054] Regarding S102 above, when it is determined that the vehicle is in a charging state, the vehicle's charging data, such as the current temperature and charge level of the battery pack, can be obtained. The cooling level can be determined based on a preset cooling level table, the current temperature and charge level of the battery pack, and the corresponding cooling target temperature can be determined based on the cooling level. The preset cooling level table can store a correspondence between the battery pack temperature, the battery pack charge level, and the cooling level.

[0055] For example, after determining that the vehicle is in a charging state, it is obtained that the current temperature of the vehicle's battery pack is 38°C and the current power is 70%. According to the preset cooling level table, the current temperature of the battery pack and the current power, it can be determined that the cooling level corresponding to the temperature of 38°C and the power of 70% is the first cooling level, and the target cooling temperature corresponding to the first cooling level is 20°C.

[0056] For example, different cooling levels having corresponding cooling target temperatures can be understood as: the cooling target temperatures corresponding to different cooling levels are not completely the same. For example, the cooling target temperatures corresponding to different cooling levels can be different, or some can be the same and some can be different. Among them, the cooling target temperature corresponding to the first cooling level can be the lowest.

[0057] In one possible implementation, determining the cooling level of the vehicle's battery pack based on charging data may include: determining a first comparison relationship between the current temperature of the battery pack and a preset temperature; determining a second comparison relationship between the current power of the battery pack and a preset power; and determining the cooling level of the vehicle's battery pack based on the first comparison relationship and the second comparison relationship.

[0058] For example, the charging data may include the current temperature and charge level of the battery pack. If the current temperature of the battery pack is 38°C and the current charge level is 75%, the current temperature of the battery pack is compared with a preset temperature to determine whether the current temperature is greater than the preset temperature, thereby obtaining a first comparison relationship. The current charge level of 75% is then compared with the preset charge level to determine whether the current charge level is greater than the preset charge level, thereby obtaining a second comparison relationship.

[0059] It is understandable that before determining the first comparison relationship between the current temperature of the battery pack and the preset temperature, the type of charging pile connected to the vehicle can be determined first, and different preset temperatures and preset power levels can be matched according to the type of charging pile.

[0060] In one possible implementation, the type of charging pile to which the vehicle is connected is determined. When the charging pile is a super charging pile, the first comparison relationship is a comparison relationship between the current temperature of the battery pack and a first preset temperature. When the charging pile is a national standard charging pile, the first comparison relationship is a comparison relationship between the current temperature of the battery pack and a second preset temperature. The first preset temperature is lower than the second preset temperature.

[0061] For example, the VCU can identify the type of charging pile connected to the vehicle based on the connection between the vehicle and the charging gun on the charging pile. In the fast charging state, the charging pile type can be divided into super charging piles and national standard charging piles. The charging current of super charging piles can reach over 250A, usually between 400-600A, while the charging current of national standard charging piles is usually below 250A. Therefore, when charging an electric vehicle, the battery pack temperature rises faster when charging with a super charging pile than when charging with a national standard charging pile.

[0062] For example, when using a super charging pile to charge an electric car, it may take 20 minutes to fully charge the battery of the electric car, so the temperature of the battery pack rises faster at this time, and it may only take 10 minutes for the temperature of the battery pack to rise to 38°C. When using a national standard charging pile to charge an electric car, it takes 40 minutes to fully charge the battery of the electric car, and it takes 20 minutes for the temperature of the battery pack to rise to 38°C, and the temperature rises more slowly. From the above content, it can be seen that the temperature of the battery pack rises faster when charging with a super charging pile than when charging with a national standard charging pile, so when using a super charging pile to charge an electric car, the battery pack should be cooled when the temperature of the battery pack is slightly lower to avoid the problem that the battery pack cannot be cooled in time due to the temperature rising too quickly. Therefore, in the embodiment of the present application, the first preset temperature corresponding to the super charging pile is set to be lower than the second preset temperature corresponding to the national standard charging pile.

[0063] In one possible implementation, the first preset temperature includes a first level preset temperature and a second level preset temperature, and the first level preset temperature is lower than the second level preset temperature; the second preset temperature includes a third level preset temperature and a fourth level preset temperature, and the third level preset temperature is lower than the fourth level preset temperature; and determining the cooling level of the battery pack of the vehicle based on the first comparison relationship and the second comparison relationship includes:

[0064] When the above-mentioned first comparison relationship is that the current temperature of the battery pack is greater than the first-level preset temperature and the above-mentioned second comparison relationship is that the current power of the battery pack is less than or equal to the preset power, it is determined that the cooling level of the vehicle's battery pack is the first cooling level; when the above-mentioned first comparison relationship is that the current temperature of the battery pack is greater than the second-level preset temperature and the above-mentioned second comparison relationship is that the current power of the battery pack is greater than the preset power, it is determined that the cooling level of the vehicle's battery pack is the second cooling level.

[0065] When the above-mentioned first comparison relationship is that the current temperature of the battery pack is greater than the third-level preset temperature and the above-mentioned second comparison relationship is that the current power of the battery pack is less than or equal to the second preset power, it is determined that the cooling level of the vehicle's battery pack is the third cooling level; when the above-mentioned first comparison relationship is that the current temperature of the battery pack is greater than the fourth-level preset temperature and the above-mentioned second comparison relationship is that the current power of the battery pack is greater than the second preset power, it is determined that the cooling level of the vehicle's battery pack is the fourth cooling level.

[0066] It is understandable that in the later stages of vehicle charging, the current gradually decreases. Therefore, when the battery pack's charge level exceeds the preset charge level, the battery pack temperature rises more slowly. Therefore, when the battery pack's current charge level exceeds the preset charge level, the corresponding second-level preset temperature should be higher than the first-level preset temperature. Similarly, when the battery pack's current charge level exceeds the preset charge level, the corresponding fourth-level preset temperature should be higher than the third-level preset temperature. For example, assuming the preset charge level is 70%, the first-level preset temperature is 35°C, and the second-level preset temperature is 36°C, when the battery pack's current temperature is greater than 35°C and the battery pack's current charge level is less than or equal to 70%, the vehicle's battery pack cooling level is determined to be the first cooling level. When the battery pack's current temperature is greater than 36°C and the battery pack's current charge level is greater than 70%, the vehicle's battery pack cooling level is determined to be the second cooling level. Assuming that the preset power is 70%, the third level preset temperature is 37°C, and the fourth level preset temperature is 38°C, when the current temperature of the battery pack is greater than 37°C and the current power of the battery pack is less than or equal to 70%, the cooling level of the vehicle's battery pack is determined to be the third cooling level; when the current temperature of the battery pack is greater than 38°C and the current power of the battery pack is greater than 70%, the cooling level of the vehicle's battery pack is determined to be the fourth cooling level.

[0067] The above technical solution determines different cooling levels according to the different power levels and temperatures of the charging pack, which can more reasonably formulate the cooling strategy of the battery pack and more accurately control the battery pack temperature to achieve the optimal cooling effect.

[0068] Exemplarily, T is used to represent the current temperature of the battery pack, and SOC is used to represent the current charge of the battery pack. T1 is used to represent the above-mentioned first-level preset temperature, T2 is used to represent the above-mentioned second-level preset temperature, T3 is used to represent the above-mentioned third-level preset temperature, and T4 is used to represent the above-mentioned fourth-level preset temperature. A% is used to represent the above-mentioned preset charge. t1 is used to represent the first cooling target temperature corresponding to the first cooling level, t2 is used to represent the second cooling target temperature corresponding to the second cooling level, t3 is used to represent the third cooling target temperature corresponding to the third cooling level, and t4 is used to represent the fourth cooling target temperature corresponding to the fourth cooling level. It can be understood that the specific values ​​of the above-mentioned preset temperatures, preset charges and cooling target temperatures can be adjusted based on the specific battery heating characteristics and charging characteristics, and the embodiments of the present application do not limit the above-mentioned specific values.

[0069] According to the above method for determining the cooling level in the fast charging state, a cooling level table as shown in Table 1 can be obtained.

[0070] Table 1

[0071]

[0072] For example, as shown in Table 1, when the charging pile type is determined to be a super charging pile, if T>T1 and SOC≤A%, the cooling level of the battery pack is determined to be the first cooling level; if T>T2 and SOC>A%, the cooling level of the battery pack is determined to be the second cooling level. When the charging pile type is determined to be a national standard charging pile, if T>T3 and SOC≤A%, the cooling level of the battery pack is determined to be the third cooling level; if T>T4 and SOC>A%, the cooling level of the battery pack is determined to be the fourth cooling level. The cooling entry temperature can be T1<T2<T3<T4, and the cooling target temperature can be t1<t2<t3<t4, or t1<t2=t3=t4.

[0073] Regarding the above S103 , it can be understood that, as shown in Table 1, different cooling levels may correspond to different cooling target temperatures.

[0074] In one possible implementation, after the VCU determines the cooling level of the battery pack, it sends the cooling target temperature corresponding to the cooling level to the air conditioning controller, so that the air conditioning controller can cool the battery pack according to the cooling target temperature value.

[0075] For example, the air conditioning controller can set different compressor speeds to cool the battery pack based on the cooling target temperature, the current vehicle ambient temperature, and user needs. Simultaneously, the VCU controls the battery pack's water pump to execute a preset duty cycle. The vehicle ambient temperature refers to the ambient temperature outside the vehicle, and the user needs refer to whether the user requires the air conditioning controller to provide cooling. The preset duty cycle is a value preset at the time the vehicle leaves the factory. It is understood that the water pump duty cycle can be adjusted during user use of the vehicle.

[0076] For example, after the air conditioning controller receives the cooling level sent by the VCU, it determines the cooling target temperature, measures the ambient temperature outside the vehicle through the temperature sensor, and determines whether the user needs the air conditioning controller to perform cooling. The compressor speed is set according to the cooling target temperature, the current ambient temperature of the vehicle, and user needs. For example, if the user needs the air conditioning controller to perform cooling, the compressor speed is increased. When the ambient temperature is 35°C, the single battery pack is cooled and the compressor speed is increased; when the ambient temperature is -15 to -20°C, the cooling can be stopped. When the cooling target temperature is 20°C, the compressor speed is set to approximately 3500r / min; when the cooling target temperature is 15°C, the compressor speed is set to 5000r / min, that is, the compressor speed is increased when the cooling target temperature is low.

[0077] In the above technical solution, the type of charging pile to which the vehicle is connected is first determined, and then the cooling level of the battery pack is determined based on the type of charging pile to which the vehicle is connected, the current temperature of the battery pack, and the current power level of the battery pack. This solution can distinguish the different heating effects of the battery pack when the battery pack is charged with currents of different sizes, accurately control the battery pack temperature, and set different compressor speeds for different charging scenarios to ensure the safety of the battery pack cells.

[0078] Figure 2 This is a schematic flow chart of another battery pack cooling method provided in an embodiment of the present application.

[0079] For example, Figure 2 As shown, the method 200 includes:

[0080] S201, detecting whether the status of the battery pack water pump is abnormal.

[0081] Exemplarily, when the state of the battery pack water pump is normal, execute S102; when the state of the battery pack water pump is abnormal, execute S202.

[0082] S102: Determine a cooling level of the vehicle's battery pack based on the charging data, wherein different cooling levels have corresponding cooling target temperatures.

[0083] It is understandable that the specific implementation of S102 is as described above and will not be repeated here.

[0084] S103 , cooling the battery pack according to the cooling target temperature corresponding to the cooling level of the battery pack.

[0085] It is understandable that the specific implementation of S103 is as described above and will not be repeated here.

[0086] S202, sending reminder information.

[0087] Among them, the above reminder information can be used to remind the user that the status of the battery pack water pump is abnormal.

[0088] Optionally, the reminder message may be sent by displaying a warning sign on the vehicle computer, or by sounding an alarm corresponding to "battery pack water pump status abnormality." The embodiment of the present application does not limit the manner in which the reminder message is sent.

[0089] In this technical solution, the battery pack water pump status is checked before determining the cooling level to ensure that the pump is functioning properly during the cooling process, without affecting the user experience. If the pump status is abnormal, a reminder message is sent to the user, allowing the user to promptly understand the vehicle's condition and enhance the user experience.

[0090] Figure 3 This is a schematic flowchart of a method for stopping cooling a battery pack provided in an embodiment of the present application.

[0091] For example, Figure 3 As shown, the method 300 is Figure 1 The steps after S103 in the method 300 include:

[0092] S301 , obtaining the temperature of the battery pack after cooling and the cooling exit temperature corresponding to the cooling level of the battery pack.

[0093] For example, the VCU acquires the temperature of the battery pack in real time. When the battery pack begins to cool, the VCU acquires the cooling exit temperature corresponding to the cooling level. The cooling exit temperatures corresponding to the cooling levels are shown in Table 2.

[0094] Table 2

[0095]

[0096] It is understandable that the specific values ​​of the cooling exit temperatures corresponding to the above cooling levels can be set based on the temperature at which the cooling is entered. For example, if the above cooling entry temperature can be T1<T2<T3<T4, then the cooling exit temperature can be Ta>Tb>Tc>Td. Because the greater the charging current, the faster the temperature of the battery pack rises, in order to prevent the temperature of the battery pack from rising too quickly, the cooling exit temperature of the battery pack under the condition of a large charging current can be set higher. This can extend the cooling time of the battery pack and better cool the battery pack. For example, the charging current corresponding to the super charging pile is relatively large, and the charging current received by the battery pack is relatively large when the battery power is low, so setting the cooling exit temperature corresponding to the first cooling level higher can extend the cooling time of the battery pack.

[0097] S302 , determining whether the temperature of the battery pack after cooling reaches a cooling exit temperature.

[0098] It is understandable that if the temperature of the battery pack after cooling reaches the cooling exit temperature, S303 is executed; if the temperature of the battery pack after cooling does not reach the cooling exit temperature, S304 is executed.

[0099] For example, if the cooling level of the battery pack is determined to be the first cooling level, the cooling exit temperature of the battery pack is Ta. Assuming Ta is 30°C, the VCU determines whether the temperature of the battery pack after cooling is less than or equal to 30°C.

[0100] S303, stopping cooling the battery pack.

[0101] Exemplarily, if the temperature of the battery pack after cooling is 29° C., and the temperature of the battery pack after cooling is lower than the cooling exit temperature Ta, cooling of the battery pack is stopped.

[0102] In one possible implementation, as fast charging progresses, the battery pack may heat up again, reaching the conditions for entering battery pack cooling again. When the battery pack again meets the conditions for entering the corresponding battery pack cooling level, the battery pack is cooled again until charging is completed.

[0103] For example, if the cooling exit temperature of the battery pack is 30°C and the temperature of the battery pack after cooling is 29°C, the battery pack cooling can be stopped and the vehicle can continue to charge. As the vehicle continues to charge, the temperature of the battery pack reaches the entry conditions of a certain cooling level, such as the second cooling level, and the battery pack is cooled again. When the temperature of the battery pack reaches the cooling exit temperature again, the battery pack cooling is stopped. It can be understood that as long as the battery pack meets the conditions for entering the cooling level, the battery pack will be cooled; when the temperature of the battery pack after cooling reaches the cooling exit temperature, the cooling can be stopped. The above-mentioned process of cooling the battery pack is cyclic until the vehicle charging is completed.

[0104] S304, continue cooling the battery pack.

[0105] For example, if the temperature of the battery pack after cooling is 33° C., and the temperature of the battery pack after cooling is greater than the cooling exit temperature Ta, the battery pack continues to be cooled until the temperature of the battery pack after cooling reaches the cooling exit temperature Ta.

[0106] Figure 4 This is a schematic flow chart of the cooling logic of a battery pack provided in an embodiment of the present application.

[0107] For example, Figure 4 As shown, the method 400 includes:

[0108] S401: Determine whether the vehicle is successfully connected to the charging gun.

[0109] It can be understood that the charging gun is an electric vehicle charging connector and a "bridge" connecting charging facilities such as charging piles with electric vehicles.

[0110] S402, detecting the status of vehicle components to determine whether the vehicle can be charged.

[0111] It is understandable that the vehicle components may include the vehicle's charging port, charging lines, etc.

[0112] For example, if the vehicle cannot be charged normally, S403 is executed; if the vehicle can be charged normally, S404 is executed.

[0113] S403: Send a reminder message to check for charging problems.

[0114] Among them, the above reminder information can be used to remind users that the status of vehicle components is abnormal and remind users to check for charging problems.

[0115] Optionally, the reminder information can be sent by displaying a warning sign on the vehicle computer, or by sounding an alarm corresponding to "vehicle status abnormality". The embodiment of the present application does not limit the method of sending the reminder information.

[0116] S404: Acquire the charging data of the vehicle and detect the type of the charging pile to which the vehicle is connected.

[0117] It is understandable that the vehicle's charging data is obtained through the VCU, and the vehicle's charging data includes the current temperature of the battery pack and the current power level of the battery pack.

[0118] S405: Determine whether the vehicle's charging status is a fast charging status.

[0119] Exemplarily, if the charging state of the vehicle is not in the fast charging state, S406 is executed; if the charging state of the vehicle is in the fast charging state, S407 is executed.

[0120] S406 , cooling the battery pack at a preset cooling target temperature.

[0121] It is understandable that when the vehicle's charging state is not fast charging, the temperature of the vehicle's battery pack does not rise quickly, so the battery pack can be cooled directly according to the preset cooling target temperature.

[0122] S407: Determine the cooling level of the vehicle's battery pack based on the vehicle's charging data and the type of charging station.

[0123] It is understandable that the specific implementation method for determining the cooling level of the vehicle's battery pack in the fast charging state is as described above and will not be repeated here.

[0124] S408 , determining a cooling target temperature corresponding to the cooling level, and cooling the battery pack according to the cooling target temperature corresponding to the cooling level.

[0125] It is understandable that the specific implementation method of cooling the battery pack according to the cooling target temperature corresponding to the cooling level is as described above and will not be repeated here.

[0126] S409: Obtain the temperature of the battery pack after cooling.

[0127] It is understandable that the temperature of the battery pack after cooling is obtained in real time through the VCU.

[0128] S410, determining whether the temperature of the battery pack after cooling is greater than the cooling exit temperature.

[0129] Illustratively, if the temperature of the battery pack after cooling is greater than the cooling exit temperature, then continue to execute S408 ; if the temperature of the battery pack after cooling is less than or equal to the cooling exit temperature, then execute S411 .

[0130] S411, stop cooling the battery pack.

[0131] It is understandable that as fast charging progresses, the battery pack may heat up again, reaching the conditions for entering battery pack cooling again. When the battery pack again meets the conditions for entering the corresponding battery pack cooling level, the battery pack is cooled again until charging is completed.

[0132] Figure 5 This is a schematic diagram of a battery pack cooling system interaction provided by an embodiment of the present application. Figure 5 As shown, the battery pack cooling system includes: a charger 501, a VCU 502, an air conditioning controller 503 and a battery management system 504.

[0133] Among them, the charger is a device specially used to charge the battery of electric vehicles. It is an electric power conversion device with specific functions used when charging the battery.

[0134] VCU is the central control unit of the vehicle and the core of the entire control system.

[0135] The air conditioning controller is the control device for the vehicle's air conditioning system. It can achieve functions such as cooling, ventilation, and defrosting by adjusting the compressor speed.

[0136] The battery management system is designed to intelligently manage and maintain each battery unit, prevent the battery from overcharging and over-discharging, extend the battery life, and monitor the battery status.

[0137] In the above system, after the VCU 502 receives the vehicle connection status information and the charging pile information to which the vehicle is connected sent by the charger 501, it starts to detect the status of the vehicle components. If it is confirmed that there is no abnormality in the status of the vehicle components, it sends a request to the battery management system 504 to obtain the current temperature of the battery pack and the current power of the battery pack; after the VCU 502 obtains the current temperature of the battery pack and the current power of the battery pack, it determines the cooling level according to the current temperature of the battery pack, the current power of the battery pack, the type of charging pile and other information, and determines the cooling target temperature corresponding to the cooling level, and sends the cooling target temperature to the air-conditioning controller 503; the air-conditioning controller 503 cools the battery pack according to the cooling target temperature.

[0138] Figure 6 It is a structural schematic diagram of a battery pack cooling device provided in an embodiment of the present application.

[0139] For example, Figure 6 As shown, the apparatus 600 includes:

[0140] The acquisition module 601 is configured to acquire charging data of the vehicle when it is determined that the vehicle is in a charging state.

[0141] The determination module 602 is configured to determine a cooling level of the battery pack of the vehicle according to the charging data; wherein different cooling levels have corresponding cooling target temperatures.

[0142] The cooling module 603 is configured to cool the battery pack according to a cooling target temperature corresponding to the cooling level of the battery pack.

[0143] In one possible implementation, the above-mentioned charging data includes the current temperature of the battery pack and the current power of the battery pack; the determination module 602 is specifically used to: determine a first comparison relationship between the current temperature of the battery pack and a preset temperature; determine a second comparison relationship between the current power of the battery pack and a preset power; and determine the cooling level of the battery pack of the vehicle based on the first comparison relationship and the second comparison relationship.

[0144] In one possible implementation, the determination module 602 is also used to: determine the type of charging pile to which the vehicle is connected; when the charging pile type is a super charging pile, the first comparison relationship is the comparison relationship between the current temperature of the battery pack and the first preset temperature; when the charging pile type is a national standard charging pile, the first comparison relationship is the comparison relationship between the current temperature of the battery pack and the second preset temperature; the first preset temperature is lower than the second preset temperature.

[0145] In a possible implementation, the first preset temperature includes a first-level preset temperature and a second-level preset temperature, and the first-level preset temperature is lower than the second-level preset temperature; the second preset temperature includes a third-level preset temperature and a fourth-level preset temperature, and the third-level preset temperature is lower than the fourth-level preset temperature; and determining the cooling level of the battery pack of the vehicle according to the first comparison relationship and the second comparison relationship includes: when the first comparison relationship is that the current temperature of the battery pack is greater than the first-level preset temperature and the second comparison relationship is that the current power of the battery pack is less than or equal to the preset power, determining that the cooling level of the battery pack of the vehicle is the first cooling level; when the first comparison relationship is that the current temperature of the battery pack is greater than the first-level preset temperature and the second comparison relationship is that the current power of the battery pack is less than or equal to the preset power, When the current temperature of the battery pack is greater than the second-level preset temperature and the second comparison relationship is that the current power of the battery pack is greater than the preset power, the cooling level of the battery pack of the vehicle is determined to be the second cooling level; for the national standard charging pile, when the first comparison relationship is that the current temperature of the battery pack is greater than the third-level preset temperature and the second comparison relationship is that the current power of the battery pack is less than or equal to the preset power, the cooling level of the battery pack of the vehicle is determined to be the third cooling level; when the first comparison relationship is that the current temperature of the battery pack is greater than the fourth-level preset temperature and the second comparison relationship is that the current power of the battery pack is greater than the preset power, the cooling level of the battery pack of the vehicle is determined to be the fourth cooling level.

[0146] Optionally, the device further includes: a detection module for detecting the status of a battery pack water pump; when the status of the battery pack water pump is normal, determining the cooling level of the battery pack is executed.

[0147] In one possible implementation, the acquisition module 601 is specifically used to: when it is determined that the charging state is a fast charging state, obtain the charging data of the vehicle; when it is determined that the charging state is a non-fast charging state, cool the battery pack at a preset cooling target temperature.

[0148] Optionally, the device also includes: a judgment module, used to obtain the temperature of the battery pack after cooling and the cooling exit temperature corresponding to the cooling level of the battery pack; judge whether the temperature of the battery pack after cooling reaches the cooling exit temperature; when the temperature of the battery pack after cooling reaches the cooling exit temperature, stop cooling the battery pack and control the vehicle to continue charging; when the temperature of the battery pack after cooling does not reach the cooling exit temperature, continue cooling the battery pack.

[0149] Figure 7 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0150] For example, Figure 7 As shown, the vehicle 700 includes: a memory 701 and a processor 702, wherein the memory 701 stores an executable program code 7011, and the processor 702 is used to call and execute the executable program code 7011 to perform a battery pack cooling method.

[0151] This embodiment can divide the vehicle into functional modules based on the above-described method example. For example, each functional module can be mapped to a specific function, or two or more functions can be integrated into a single processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used.

[0152] In the case of dividing each functional module into corresponding functional modules, the vehicle may include: an acquisition module, a determination module, a cooling module, etc. It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0153] The vehicle provided in this embodiment is used to execute the above-mentioned method for cooling a battery pack, and thus can achieve the same effect as the above-mentioned implementation method.

[0154] In the case of an integrated unit, the vehicle may include a processing module and a storage module. The processing module may be used to control and manage the vehicle's movements, while the storage module may be used to support the vehicle's execution of program codes and data.

[0155] The processing module may be a processor or controller that implements or executes various exemplary logic blocks, modules, and circuits disclosed herein. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processing (DSP) and a microprocessor, and the storage module may be a memory.

[0156] This embodiment also provides a computer-readable storage medium, which stores computer program code. When the computer program code runs on a computer, the computer executes the above-mentioned related method steps to implement a battery pack cooling method in the above-mentioned embodiment.

[0157] This embodiment further provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement a battery pack cooling method in the above-mentioned embodiment.

[0158] In addition, the electronic device provided in the embodiments of the present application may specifically be a chip, component or module, and the electronic device may include a connected processor and memory; wherein the memory is used to store instructions, and when the electronic device is running, the processor may call and execute the instructions to enable the chip to execute a battery pack cooling method in the above-mentioned embodiment.

[0159] Among them, the vehicle, computer-readable storage medium, computer program product or chip provided in this embodiment are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0160] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0161] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, 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.

[0162] The above content is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for cooling a battery pack, characterized in that: The method is a method for cooling a battery pack in a fast-charging state, and the method includes: When determining that the charging state of the battery pack of the vehicle is a fast charging state, obtaining a current temperature of the battery pack of the vehicle and a current power level of the battery pack; The cooling level of the battery pack is determined according to the type of charging pile connected to the vehicle, the current temperature of the battery pack and the current power of the battery pack; wherein, when the charging pile type is a super charging pile, if the first comparison relationship is that the current temperature of the battery pack is greater than the first level preset temperature and the second comparison relationship is that the current power of the battery pack is less than or equal to the preset power, then the cooling level of the battery pack of the vehicle is determined to be the first cooling level and the first cooling target temperature corresponding to the first cooling level; if the first comparison relationship is that the current temperature of the battery pack is greater than the second level preset temperature and the second comparison relationship is that the current power of the battery pack is greater than the preset power, then the cooling level of the battery pack of the vehicle is determined to be the second cooling level and the second cooling target temperature corresponding to the second cooling level; the first level preset The temperature is less than the second-level preset temperature; when the charging pile type is a national standard charging pile, if the first comparison relationship is that the current temperature of the battery pack is greater than the third-level preset temperature and the second comparison relationship is that the current power of the battery pack is less than or equal to the preset power, then it is determined that the cooling level of the battery pack of the vehicle is the third cooling level and the third cooling target temperature corresponding to the third cooling level; if the first comparison relationship is that the current temperature of the battery pack is greater than the fourth-level preset temperature and the second comparison relationship is that the current power of the battery pack is greater than the preset power, then it is determined that the cooling level of the battery pack of the vehicle is the fourth cooling level and the fourth cooling target temperature corresponding to the fourth cooling level; the second-level preset temperature is less than the third-level preset temperature; the third-level preset temperature is less than the fourth-level preset temperature; The battery pack is cooled according to the cooling target temperature corresponding to the cooling level of the battery pack; wherein the first cooling target temperature is lower than the second cooling target temperature; the second cooling target temperature is lower than the third cooling target temperature; and the third cooling target temperature is lower than the fourth cooling target temperature.

2. The method according to claim 1, characterized in that Before determining the type of the charging pile connected to the vehicle, the current temperature of the battery pack, and the current charge of the battery pack, the method further includes: Check the status of the battery pack water pump; When the state of the battery pack water pump is normal, determining the cooling level of the battery pack is performed.

3. The method according to claim 1, characterized in that The method further comprises: When it is determined that the charging state is a non-fast charging state, the battery pack is cooled at a preset cooling target temperature.

4. The method according to claim 1, wherein After cooling the battery pack, the method further includes: Obtaining the temperature of the battery pack after cooling and the cooling exit temperature corresponding to the cooling level of the battery pack; Determining whether the temperature of the battery pack after cooling reaches the cooling exit temperature; When the temperature of the battery pack after cooling reaches the cooling exit temperature, stopping cooling the battery pack; When the temperature of the battery pack after cooling does not reach the cooling exit temperature, the battery pack continues to be cooled.

5. A cooling device for a battery pack, characterized in that: The device is a cooling device for a battery pack in a fast-charging state, and the device includes: an acquisition module, configured to acquire a current temperature of the battery pack of the vehicle and a current charge level of the battery pack when determining that the charging state of the battery pack of the vehicle is a fast charging state; A determination module, configured to determine a cooling level of a battery pack of the vehicle according to the type of charging pile to which the vehicle is connected, the current temperature of the battery pack, and the current charge of the battery pack; wherein, when the charging pile type is a super charging pile, if the first comparison relationship is that the current temperature of the battery pack is greater than the first-level preset temperature and the second comparison relationship is that the current charge of the battery pack is less than or equal to the preset charge, then the cooling level of the battery pack of the vehicle is determined to be the first cooling level and the first cooling target temperature corresponding to the first cooling level; if the first comparison relationship is that the current temperature of the battery pack is greater than the second-level preset temperature and the second comparison relationship is that the current charge of the battery pack is greater than the preset charge, then the cooling level of the battery pack of the vehicle is determined to be the second cooling level and the second cooling target temperature corresponding to the second cooling level; the second comparison relationship is that the current temperature of the battery pack is greater than the second-level preset temperature and the second comparison relationship is that the current charge of the battery pack is greater than the preset charge, The first level preset temperature is less than the second level preset temperature; when the charging pile type is a national standard charging pile, if the first comparison relationship is that the current temperature of the battery pack is greater than the third level preset temperature and the second comparison relationship is that the current power of the battery pack is less than or equal to the preset power, then it is determined that the cooling level of the battery pack of the vehicle is the third cooling level and the third cooling target temperature corresponding to the third cooling level; if the first comparison relationship is that the current temperature of the battery pack is greater than the fourth level preset temperature and the second comparison relationship is that the current power of the battery pack is greater than the preset power, then it is determined that the cooling level of the battery pack of the vehicle is the fourth cooling level and the fourth cooling target temperature corresponding to the fourth cooling level; the second level preset temperature is less than the third level preset temperature; the third level preset temperature is less than the fourth level preset temperature; The battery pack is cooled according to the cooling target temperature corresponding to the cooling level of the battery pack; wherein the first cooling target temperature is lower than the second cooling target temperature; the second cooling target temperature is lower than the third cooling target temperature; and the third cooling target temperature is lower than the fourth cooling target temperature.

6. A vehicle, characterized in that: The vehicle comprises: a memory for storing executable program code; A processor is configured to call and run the executable program code from the memory, so that the vehicle executes the method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 4 is implemented.

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