Battery cooling method and device, vehicle-mounted terminal and vehicle

Abstract

The invention relates to a battery cooling method and device, a vehicle-mounted terminal and a vehicle, and relates to the technical field of vehicles. The temperature control parameter is used for indicating that the temperature of the battery pack does not exceed the target temperature within the target duration; determining the refrigeration demand of the battery pack according to the current temperature information and the temperature control parameters of the battery pack; and performing cooling management on the battery pack according to the refrigeration demand quantity. The safety of battery operation is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, in particular to the field of battery technology, and specifically to a battery cooling method, device, vehicle-mounted terminal and vehicle. Background Art

[0002] In recent years, electric vehicles have developed rapidly, and power batteries, as key components of electric vehicles, have also developed rapidly in technology. In order to ensure the safety, discharge performance and life performance of batteries when used at high temperatures, batteries need to be cooled.

[0003] The related technical solution discloses a battery thermal management method for electric vehicles based on model predictive control. The battery thermal management method establishes a system model for battery thermal management including battery electric-thermal-aging multi-state estimation and cooling system, and combines the state estimator and cost function of the model predictive controller and the vehicle speed prediction model and other algorithms and models to set a reference value for the optimal cooling temperature of the battery. The related technical solution also discloses a battery thermal management control method, which predicts the time the user uses the vehicle, balances the battery temperature control and the energy consumption required for driving to determine the optimal temperature value at the beginning of the journey.

[0004] It can be seen that as the thermal management of electric vehicle power batteries becomes increasingly important, a variety of battery cooling methods have emerged. Currently, the battery is usually cooled when the battery temperature reaches a preset temperature. In this way, the battery is cooled only when the battery reaches a high temperature, which cannot better protect the battery. Summary of the invention

[0005] The present application provides a battery cooling method, device, vehicle-mounted terminal and vehicle, which are used to improve the safety of battery operation. The technical solution of the present application is as follows: According to a first aspect provided by the present application, a battery cooling method is provided, the method comprising: obtaining a temperature control parameter of a battery pack. The temperature control parameter is used to indicate that the temperature of the battery pack is controlled not to exceed a target temperature within a target time. According to current temperature information of the battery pack and the temperature control parameter, a cooling demand of the battery pack is determined. According to the cooling demand, cooling management is performed on the battery pack.

[0006] Based on the above technical means, the temperature control parameters of the battery pack are obtained, and the required cooling capacity of the battery pack is determined according to the current temperature information and the temperature control parameters. Furthermore, the battery pack is cooled and managed according to the cooling demand. In this way, the cooling demand for the battery pack to reach the target temperature from the current temperature within the target time is determined, and the battery pack is cooled and managed according to the cooling demand. In this way, when the battery pack reaches the target temperature and requires cooling capacity, the cooling is turned on in advance, and the battery is cooled and managed in time, which can better protect the battery from overheating, thereby improving the safety of the battery. In addition, when the required cooling capacity does not meet the battery cooling conditions, there is no need to cool the battery, saving energy consumption.

[0007] In one possible manner, the current temperature information includes the current actual temperature of the battery pack and the ambient temperature of the battery pack. According to the current temperature information of the battery pack and the temperature control parameters, the cooling requirement of the battery pack is determined, including: obtaining the heating power of the battery pack. According to the heating power, the current actual temperature, the ambient temperature and the control parameters, the cooling requirement is determined.

[0008] Based on the above technical means, the cooling demand is determined according to the current actual temperature, ambient temperature and temperature control parameters. In this way, the environmental heat dissipation is comprehensively considered, and it has strong adaptability to complex environmental factors, thereby accurately managing the cooling of the battery pack and better protecting the battery.

[0009] In one possible manner, the cooling demand includes a total cooling demand power, and the battery pack includes multiple battery cells. The cooling demand is determined based on the heat generation power, the current actual temperature, the ambient temperature, and the control parameters, including: for each of the multiple battery cells, the cooling demand power of the battery cell is determined based on the specific heat capacity of the battery cell, the heat generation power of the battery cell, the current actual temperature, the ambient temperature, and the control parameters. The total cooling demand power is determined based on the cooling demand powers of the multiple battery cells.

[0010] Based on the above technical means, the cooling demand is determined according to the specific heat capacity of the battery cell, the current actual temperature, the ambient temperature and the temperature control parameters. In this way, the regulation capacity of the battery pack is comprehensively considered, making the cooling demand more accurate.

[0011] In one possible way, the cooling power requirement of the battery cell is determined according to the specific heat capacity of the battery cell, the heating power of the battery cell, the current actual temperature, the ambient temperature and the control parameters, including: determining the adjustment power of the battery pack according to the current actual temperature, the specific heat capacity of the battery cell, the target duration and the target temperature. The adjustment power is the exothermic power or the endothermic power. The heat exchange power between the battery pack and the environment is determined according to the preset environmental exchange coefficient, the ambient temperature and the current actual temperature. The cooling power requirement of the battery cell is determined according to the adjustment power, the heat exchange power and the heating power of the battery cell.

[0012] Based on the above technical means, the cooling demand is determined according to the regulated heat value, heat exchange value and calorific value of the battery pack, and the cooling demand represents the relationship between the heat dissipation and heat generation of the battery pack. The cooling demand is more accurate by comprehensively considering the environmental heat dissipation and the regulation ability of the battery pack. Therefore, it is possible to simply and effectively determine whether the discharged battery needs to be cooled.

[0013] In one possible manner, the method further includes: determining a temperature control parameter according to a state of charge SOC of the battery pack and a current cooling mode of the battery pack.

[0014] In one possible manner, the temperature control parameters are determined according to the state of charge (SOC) of the battery pack and the current cooling mode of the battery pack, including: when the state of charge (SOC) of the battery pack is greater than or equal to a first power threshold, the temperature control parameters are determined to include a first target duration and a first target temperature. When the state of charge (SOC) of the battery pack is less than the first power threshold, the temperature control parameters are determined according to the current cooling mode of the battery pack.

[0015] In one possible manner, the temperature control parameters are determined according to the current cooling mode of the battery pack, including: when the current cooling mode is the first cooling mode, the second temperature control parameters are determined. The second temperature control parameters include a second target duration and a second target temperature. Among them, the first target duration is greater than the second target duration, and the first target temperature is greater than the second target temperature. When the current cooling mode is the second cooling mode, the temperature control parameters are determined. The temperature control parameters include a third target duration and a third target temperature. The power consumption of the first cooling mode is less than that of the second cooling mode, the second target duration is greater than the third target duration, and the second target temperature is greater than the third target temperature.

[0016] Based on the above technical means, the target temperature and target duration are determined according to the state of charge and cooling mode. When the state of charge is low or the energy consumption is low, the temperature near the battery pack is increased to reduce the cooling energy consumption.

[0017] In one possible approach, temperature control parameters are determined based on the state of charge SOC of the battery pack and the current cooling mode of the battery pack, including: when the battery pack is in a dischargeable state and the battery pack is not connected to a charging device, temperature control parameters are determined based on the state of charge SOC of the battery pack and the current cooling mode of the battery pack.

[0018] In one possible embodiment, the battery pack is provided with a cooling system, and the cooling system is used to adjust the temperature of the battery pack and perform cooling management on the battery pack according to the cooling demand, including: when the cooling demand is greater than or equal to a preset threshold, adjusting the temperature of the cooling medium in the cooling system according to the current actual temperature, control parameters, and the ambient temperature of the environment in which the battery pack is located, and the adjusted temperature is less than the target temperature.

[0019] According to a second aspect provided by the present application, a battery cooling device is provided, the battery cooling device comprising: an acquisition unit, a determination unit and a processing unit. The acquisition unit is used to acquire the temperature control parameters of the battery pack. The temperature control parameters are used to indicate that the temperature of the battery pack is controlled not to exceed the target temperature within the target time. The determination unit is used to determine the cooling demand of the battery pack according to the current temperature information of the battery pack and the temperature control parameters. The processing unit is used to perform cooling management on the battery pack according to the cooling demand.

[0020] In one possible manner, the current temperature information includes the current actual temperature of the battery pack and the ambient temperature of the battery pack. The determination unit is configured to: obtain the heating power of the battery pack and determine the cooling demand according to the heating power, the current actual temperature, the ambient temperature and the control parameters.

[0021] In one possible manner, the cooling demand includes a total cooling demand power, and the battery pack includes a plurality of battery cells. The determination unit is used to: for each of the plurality of battery cells, determine the cooling demand power of the battery cell according to the specific heat capacity of the battery cell, the heating power of the battery cell, the current actual temperature, the ambient temperature, and the control parameter. Determine the total cooling demand power according to the cooling demand powers of the plurality of battery cells.

[0022] In one possible manner, the determination unit is used to: determine the regulation power of the battery pack according to the current actual temperature, the specific heat capacity of the battery cell, the target duration, and the target temperature. The regulation power is the exothermic power or the endothermic power. The heat exchange power between the battery pack and the environment is determined according to the preset environmental exchange coefficient, the ambient temperature, and the current actual temperature. The cooling demand power of the battery cell is determined according to the regulation power, the heat exchange power, and the heating power of the battery cell.

[0023] In a possible manner, the determination unit is further configured to determine the temperature control parameter according to the state of charge SOC of the battery pack and a current cooling mode of the battery pack.

[0024] In one possible manner, the determination unit is configured to: determine the temperature control parameters including the first target duration and the first target temperature when the state of charge (SOC) of the battery pack is greater than or equal to the first power threshold; and determine the temperature control parameters according to the current cooling mode of the battery pack when the state of charge (SOC) of the battery pack is less than the first power threshold.

[0025] In one possible manner, the determination unit is used to: determine the second temperature control parameter when the current cooling mode is the first cooling mode. The second temperature control parameter is used to indicate that the temperature of the battery pack is controlled not to exceed the second target temperature within the second target duration. It includes the second target duration and the second target temperature. Among them, the first target duration is greater than the second target duration, and the first target temperature is greater than the second target temperature. When the current cooling mode is the second cooling mode, the temperature control parameter is determined. The temperature control parameters include a third target duration and a third target temperature. The power consumption of the first cooling mode is less than that of the second cooling mode, the second target duration is greater than the third target duration, and the second target temperature is greater than the third target temperature.

[0026] In one possible manner, the determination unit is configured to determine the temperature control parameter according to the state of charge SOC of the battery pack and the current cooling mode of the battery pack when the battery pack is in a dischargeable state and the battery pack is not connected to a charging device.

[0027] In one possible embodiment, the battery pack is provided with a cooling system, and the cooling system is used to adjust the temperature of the battery pack. The processing unit is specifically used to: when the cooling demand is greater than or equal to a preset threshold, adjust the temperature of the cooling medium in the cooling system according to the current actual temperature, control parameters, and the ambient temperature of the battery pack, and the adjusted temperature is less than the target temperature.

[0028] According to the third aspect provided by the present application, a vehicle-mounted terminal is provided, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to execute instructions to implement the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0029] According to the fourth aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by the processor of the vehicle terminal, the vehicle terminal executes the method of the above-mentioned first aspect and any possible implementation method thereof.

[0030] According to the fifth aspect provided by the present application, a computer program product is provided, which includes computer instructions. When the computer instructions are executed on a vehicle-mounted terminal, the vehicle-mounted terminal executes the method of the above-mentioned first aspect and any possible implementation method thereof.

[0031] According to a sixth aspect provided by the present application, a vehicle is provided, the vehicle comprising the vehicle-mounted terminal as described in the third aspect.

[0032] It should be noted that the technical effects brought about by any implementation method in the second to sixth aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0035] Figure 1 is a structural schematic diagram of a battery control system according to an exemplary embodiment; Figure 2 is a schematic structural diagram of a cooling system according to an exemplary embodiment; Figure 3 is one of the flowchart diagrams of a battery cooling method according to an exemplary embodiment; Figure 4 is a schematic diagram showing heat generation and filtering effect of a single cell according to an exemplary embodiment; Figure 5 is a schematic diagram of battery heat exchange according to an exemplary embodiment; Figure 6 is a schematic diagram of battery discharge current under a test condition according to an exemplary embodiment; Figure 7 is a schematic diagram of battery cooling for battery discharge under a test condition according to an exemplary embodiment; Figure 8 is a second flow chart of a battery cooling method according to an exemplary embodiment; Fig. 9 is a schematic structural diagram of a battery cooling device according to an exemplary embodiment; Fig.10 The figure is a schematic diagram of the structure of a vehicle-mounted terminal according to an exemplary embodiment. DETAILED DESCRIPTION

[0036] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0038] As described in the background technology, currently, the battery is usually cooled when the battery temperature reaches a preset temperature. In this way, the battery is cooled only when the battery temperature reaches a high temperature, which cannot better protect the battery. For example, in a scenario where the battery discharge power is high and the ambient temperature is high, the battery is cooled only when the battery temperature is high, which makes the battery cooling relatively lagging, and the battery temperature will continue to increase for a period of time, thus affecting the safety of battery operation.

[0039] In order to solve the above technical problems, a battery cooling method is provided in an embodiment of the present application, the method comprising: obtaining a temperature control parameter of a battery pack. The temperature control parameter is used to indicate that the temperature of the battery pack is controlled not to exceed a target temperature within a target time. According to the current temperature information of the battery pack and the temperature control parameter, the cooling demand of the battery pack is determined. According to the cooling demand, the battery pack is cooled and managed.

[0040] In this way, the temperature control parameters of the battery pack are obtained, and the required cooling capacity of the battery pack is determined based on the current temperature information and the temperature control parameters. Furthermore, the battery pack is cooled and managed based on the cooling demand. In this way, the cooling demand for the battery pack to reach the target temperature from the current temperature within the target time is determined, and the battery pack is cooled and managed based on the cooling demand. In this way, when the battery pack reaches the target temperature and requires cooling capacity, cooling is turned on in advance, and the battery is cooled and managed in time, which can better protect the battery from overheating, thereby improving the safety of the battery. In addition, when the required cooling capacity does not meet the battery cooling conditions, there is no need to cool the battery, saving energy consumption.

[0041] like Figure 1 As shown, Figure 1 1 is a schematic diagram showing a structure of a battery control system 100 according to an exemplary embodiment. The battery control system 100 may include a vehicle terminal 101 and a battery pack 102. The vehicle terminal 101 is in communication connection with the battery pack 102.

[0042] In some embodiments, the battery control system 100 may further include a temperature sensor. The vehicle terminal 101 collects the temperature of the battery pack 102 and the ambient temperature of the environment where the battery pack 102 is located through the temperature sensor.

[0043] In some embodiments, the vehicle terminal 101 is further used to obtain the temperature control parameters of the battery pack 102. The temperature control parameters are used to indicate that the temperature of the battery pack 102 is controlled not to exceed the target temperature within the target time. The vehicle terminal 101 is also used to determine the cooling demand of the battery pack 102 based on the current temperature information of the battery pack 102 and the temperature control parameters. The battery pack 102 is cooled and managed according to the cooling demand.

[0044] In some other embodiments, the vehicle-mounted terminal 101 includes a memory, and the memory stores temperature control parameters.

[0045] In some embodiments, the vehicle terminal cools the battery pack 102 through the battery pack cooling system.

[0046] For example, Figure 2 As shown, Figure 2 2 is a schematic diagram of a cooling system 200 according to an exemplary embodiment. The cooling system 200 includes a battery pack 102, a compressor 202, a condenser 203, an expansion valve 204, and a battery cooler 205. The compressor 202 is connected to the condenser 203 and the battery cooler 205, respectively, and the expansion valve 204 is connected to the condenser 203 and the battery cooler 205, respectively. The battery pack 102 is connected to the battery cooler 205.

[0047] When the battery cooling system 200 is started, the coolant passes through the compressor 202, the condenser 203, the expansion valve 204, and the battery cooler 205, and then passes through the inlet of the battery pack 102 to cool the battery pack 102. Subsequently, the coolant flows out from the outlet of the battery pack 102, passes through the battery cooler 205, and then flows back to the compressor 202.

[0048] It should be noted that in the embodiment of the present application, the cooling system 200 mainly controls the temperature or cooling power of the cooling medium, and does not limit the control method of the specific cooling system and the compressor 202. Figure 2 The cooling architecture shown is also applicable to other similar cooling architectures.

[0049] The vehicle-mounted terminal 101 in the embodiment of the present application may be a control device in a thermal management system in a vehicle, or may be a main control device of the vehicle, and the embodiment of the present application does not make any specific limitation on this.

[0050] For ease of understanding, the battery cooling method provided in the present application is specifically introduced below with reference to the accompanying drawings.

[0051] Figure 3 It is a flowchart of a battery cooling method according to an exemplary embodiment. The method includes: S301-S303.

[0052] S301. Obtain temperature control parameters of a battery pack.

[0053] The temperature control parameter is used to indicate that the temperature of the battery pack is controlled not to exceed the target temperature within the target time.

[0054] In the embodiment of the present application, the target temperature is the critical temperature to which the battery pack changes from the current temperature. The target duration is the operating duration of the battery pack.

[0055] As a possible implementation method, the vehicle-mounted terminal obtains battery parameters of the battery pack, and determines the temperature control parameters of the battery pack according to the battery parameters of the battery pack.

[0056] In the embodiment of the present application, the battery parameters of the battery pack may include one or more of the remaining power, temperature, voltage and charge / discharge rate of the battery pack.

[0057] In some embodiments, the vehicle terminal determines the control parameter according to the battery parameter and the target correspondence relationship, wherein the target correspondence relationship includes a plurality of battery parameters and a temperature control parameter corresponding to each battery parameter.

[0058] For example, the vehicle terminal obtains the state of charge (SOC) of the battery pack, and determines the target temperature and target duration of the battery pack according to the SOC of the battery pack and the target correspondence relationship. The target correspondence relationship includes multiple SOCs and the temperature and duration corresponding to each SOC.

[0059] For example, the SOC of the battery pack is 25%. The vehicle terminal determines that the target temperature corresponding to the remaining power of 25% is 44°C and the target duration is 600 seconds according to the corresponding relationship table. The corresponding relationship table is shown in Table 1 below.

[0060] Table 1 Correspondence table

[0061] In some embodiments, the vehicle terminal determines the temperature control parameters according to the battery parameters and the parameter determination function. The target duration is positively correlated with the remaining power of the battery pack, and the target temperature is negatively correlated with the remaining power of the battery pack. In this way, when the battery state of charge is low, the temperature control duration is set longer to reduce the cooling time, which can reduce cooling energy consumption.

[0062] For example, the vehicle terminal inputs the SOC and voltage of the battery pack into a parameter determination function to obtain a target temperature.

[0063] It should be noted that the target correspondence relationship and the parameter determination function are pre-stored in the vehicle terminal.

[0064] In some embodiments, the vehicle terminal determines the temperature control parameter according to the state of charge SOC of the battery pack and the current cooling mode of the battery pack. This step is described in detail in the following embodiment and will not be repeated here.

[0065] In some embodiments, before determining the temperature control parameters, the vehicle-mounted terminal obtains the state of the battery pack, and determines the temperature control parameters when the state of the battery pack meets preset conditions.

[0066] For example, the vehicle terminal determines whether the battery pack is currently in a dischargeable state and is not connected to a charging gun. If so, the temperature control parameters of the battery pack are determined according to the battery parameters of the battery pack, and the battery pack is cooled according to the temperature control parameters. Otherwise, the battery pack is not cooled.

[0067] As another possible implementation method, the vehicle terminal obtains the temperature control parameters from the memory.

[0068] In some embodiments, the vehicle terminal obtains the temperature control parameters from the memory when the battery pack is currently in a dischargeable state and is not connected to a charging gun.

[0069] S302: Determine the cooling requirement of the battery pack according to the current temperature information of the battery pack and the temperature control parameters.

[0070] The cooling demand may be used to characterize the cooling capacity required by the battery pack within the target duration. For example, the cooling demand may include cooling demand heat or cooling demand power.

[0071] In some embodiments, the current temperature information includes the current actual temperature of the battery pack and the ambient temperature of the battery pack. The vehicle terminal obtains the heating power of the battery pack and determines the cooling demand according to the heating power, the current actual temperature, the ambient temperature and the control parameters. This step is described in detail in the following embodiment and will not be repeated here.

[0072] In other embodiments, the vehicle-mounted terminal obtains current temperature information, and inputs the current temperature information, target duration, and target temperature into a cooling capacity model to obtain a cooling demand.

[0073] In the embodiment of the present application, the cooling demand of the battery pack is the cooling capacity required to adjust the temperature of the battery pack from the current actual temperature to the target temperature within the target time. Subsequently, if the cooling capacity is small, the cooling system may not be started. Otherwise, the cooling system needs to be started to cool the battery pack.

[0074] S303: Perform cooling management on the battery pack according to cooling demand.

[0075] As a possible implementation method, when obtaining the cooling demand value, the vehicle terminal determines whether the cooling demand value meets the battery cooling condition, and performs cooling management on the battery pack when the cooling demand value meets the battery cooling condition. When the cooling demand value does not meet the battery cooling condition, no cooling management is performed on the battery pack.

[0076] In the embodiment of the present application, the cooling demand satisfies the battery cooling condition when the total heat demanded by the cooling is greater than a heat threshold and / or the total power demanded by the cooling is greater than a power threshold.

[0077] It should be noted that the heat threshold and the power threshold are pre-configured. Exemplarily, the heat threshold can be 0, or other values, which are not limited in the embodiments of the present application.

[0078] In some embodiments, when the cooling demand is greater than or equal to a preset threshold, the vehicle terminal adjusts the temperature of the cooling medium in the cooling system according to the current actual temperature, control parameters, and the ambient temperature of the battery pack, and the adjusted temperature is less than the target temperature.

[0079] This step is described in detail in the following embodiment and will not be described again here.

[0080] In some embodiments, when the cooling demand meets the battery cooling condition, the vehicle terminal determines the cooling demand as the total cooling demand and cools the cooling medium according to the total cooling demand. In this way, the cooled cooling medium takes away the corresponding heat generated by the battery pack, and controls the temperature of the battery pack not to be higher than the target temperature.

[0081] In other embodiments, when the cooling demand meets the battery cooling condition, the vehicle-mounted terminal cools the battery pack according to the preset cooling power.

[0082] The battery cooling method provided in the embodiment of the present application brings at least the following beneficial effects: the temperature control parameters of the battery pack are obtained, and the required cooling capacity of the battery pack is determined based on the current temperature information and the temperature control parameters. Furthermore, the battery pack is cooled and managed based on the cooling demand. In this way, the cooling demand for the battery pack to reach the target temperature from the current temperature within the target time is determined, and the battery pack is cooled and managed based on the cooling demand. In this way, when the battery pack reaches the target temperature and requires cooling capacity, the cooling is turned on in advance, and the battery is cooled and managed in time, which can better protect the battery from overheating, thereby improving the safety of the battery. In addition, when the required cooling capacity does not meet the battery cooling conditions, there is no need to cool the battery, saving energy consumption.

[0083] In one design, in order to improve the user experience, the above S301 includes: S3011.

[0084] S3011 . Determine a temperature control parameter according to the state of charge (SOC) of the battery pack and a current cooling mode of the battery pack.

[0085] As a possible implementation method, when the state of charge (SOC) of the battery pack is greater than or equal to the first power threshold, the vehicle terminal determines the temperature control parameters including the first target duration and the first target temperature. When the state of charge (SOC) of the battery pack is less than the first power threshold, the temperature control parameters are determined according to the current cooling mode of the battery pack.

[0086] In some embodiments, the vehicle terminal obtains the state of charge of the battery pack and determines whether the state of charge of the battery pack is greater than or equal to a first power threshold. Further, when the state of charge of the battery pack is greater than or equal to the first power threshold, the vehicle terminal determines that the temperature control parameters include a first target duration and a first target temperature. When the state of charge SOC of the battery pack is less than the first power threshold, the current cooling mode of the battery pack is obtained, and the temperature control parameters are determined according to the current cooling mode of the battery pack.

[0087] Further, when the current cooling mode is the first cooling mode, the second temperature control parameter is determined. The second temperature control parameter includes a second target duration and a second target temperature. Among them, the first target duration is greater than the second target duration, and the first target temperature is greater than the second target temperature. When the current cooling mode is the second cooling mode, the temperature control parameter is determined. The temperature control parameter includes a third target duration and a third target temperature. The power consumption of the first cooling mode is less than that of the second cooling mode, the second target duration is greater than the third target duration, and the second target temperature is greater than the third target temperature.

[0088] In some embodiments, the first cooling mode and the second cooling mode are pre-configured. The present application embodiment does not specifically limit the naming of the first cooling mode and the second cooling mode. For example, the second cooling mode may be a high power performance mode, and the first cooling mode may be a high economic performance mode. In this way, in response to clicking the "first cooling mode" control, the first cooling mode will be adjusted according to the current cooling mode of the battery pack.

[0089] In other embodiments, the first cooling mode and the second cooling mode are determined according to the discharge power and temperature of the battery pack. For example, if the discharge power of the battery pack is greater than or equal to the first power, and the temperature of the battery pack is greater than or equal to the fourth target temperature, the current cooling mode is the second cooling mode. Otherwise, the current cooling mode is the first cooling mode.

[0090] In other embodiments, the first target duration is equal to the second target duration, and the first target temperature is equal to the second target temperature.

[0091] It should be noted that the first power threshold, first target temperature, second target temperature, third target temperature, fourth target temperature, first target duration, second target duration and third target duration in the embodiment of the present application are pre-configured in the vehicle terminal, and the embodiment of the present application does not specifically limit its data.

[0092] It is understandable that the target temperature and target duration are determined according to the state of charge and the cooling mode. When the state of charge is low or the energy consumption is low, the temperature near the line reached by the battery pack is increased to reduce the cooling energy consumption.

[0093] In one design, in order to accurately determine the cooling demand, the current temperature information includes the current actual temperature of the battery pack and the ambient temperature of the battery pack. The above S302 includes: S3021-S3022.

[0094] S3021. Obtain the heating power of the battery pack.

[0095] In the embodiment of the present application, the heating power of the battery pack may be the heating power of the battery pack, or the heating power of a single battery cell in the battery pack.

[0096] In some embodiments, the vehicle terminal obtains the heating power of the target single battery cell in the battery pack, and determines the total heating power of the battery pack according to the heating power of the target single battery cell and the number of single battery cells in the battery pack.

[0097] Specifically, the vehicle terminal determines the heating power according to the cell voltage, open circuit voltage and discharge current of the cell in the battery pack.

[0098] For example, the vehicle terminal inputs the single cell voltage, open circuit voltage and discharge current into the heating value formula to obtain the heating power of the single cell.

[0099] For example, the calorific value formula is shown in the following formula 1.

[0100] Formula 1.

[0101] in, is the heating power, is the single cell voltage, is the open circuit voltage, is the discharge current.

[0102] It should be noted that the single cell voltage is the voltage of the single cell when it is discharged, the open circuit voltage is the voltage of the single cell when it is not discharged (or the rated voltage of the single cell), and the open circuit current is the discharge current of the battery pack.

[0103] In other embodiments, the vehicle terminal determines the heating power of the single battery cell. In the case of Filtering is performed to obtain the filtered heating power.

[0104] For example, the heating power of a single cell Input the filter formula to get the heating power after filtering. The filter formula is shown in the following formula 2.

[0105] Formula 2.

[0106] in, is the heating power after the n+1th filter, α is the filter coefficient, is the n+1th observed heating power, is the nth estimated heating power.

[0107] For example, Figure 4 As shown, Figure 4 FIG. 1 is a schematic diagram showing the heat generation and filtering effect of a single cell battery according to an exemplary embodiment. Figure 4 It is shown in the figure that during the discharge process of the battery pack, the heat generation of the battery cells fluctuates greatly. Therefore, by filtering the heat generation power, an adaptive cooling strategy can be made for the unstable heat generation during driving.

[0108] In some embodiments, the cell voltage may be the cell voltage of the cell with the highest temperature in the battery pack. In other embodiments, in order to avoid local voltage outliers, the cell voltage is the average voltage of multiple cell voltages in the battery pack. The embodiment of the present application does not specifically limit the value of the cell voltage.

[0109] S3022. Determine the cooling demand according to the heating power, the current actual temperature, the ambient temperature and the control parameters.

[0110] As a possible implementation method, the vehicle terminal determines the regulated heat and heat exchange amount of the electronic group according to the current actual temperature, ambient temperature and control parameters, and determines the cooling demand according to the total heat generation power, regulated heat value and heat exchange amount of the battery group. Among them, the regulated heat value is the heat absorbed or dissipated by the electronic group when it is adjusted from the current actual temperature to the target temperature, and the heat exchange amount is the exchange heat between the battery group and the environment in which the battery group is located.

[0111] In this way, the cooling demand is determined based on the regulated heat value, heat exchange value and calorific value of the battery pack, and the cooling demand represents the relationship between the heat dissipation and heat generation of the battery pack. The cooling demand is more accurate by comprehensively considering the environmental heat dissipation and the regulation capability of the battery pack. Therefore, it is possible to simply and effectively determine whether the discharged battery needs to be cooled.

[0112] As a possible implementation method, the cooling demand includes the total cooling demand power, and the battery pack includes multiple battery cells. The vehicle terminal determines the cooling demand power of each of the multiple battery cells according to the specific heat capacity of the battery cell, the heating power of the battery cell, the current actual temperature, the ambient temperature, and the control parameters. And the total cooling demand power is determined based on the cooling demand powers of the multiple battery cells.

[0113] In some embodiments, the adjustment power of the battery pack is determined according to the current actual temperature, the specific heat capacity of the battery cell, the target duration, and the target temperature. The adjustment power is the exothermic power or the endothermic power. The heat exchange power between the battery pack and the environment is determined according to the preset environmental exchange coefficient, the ambient temperature, and the current actual temperature. The cooling demand power of the battery cell is determined according to the adjustment power, the heat exchange power, and the heating power of the battery cell.

[0114] In other embodiments, the cooling demand power of the battery cell is obtained by inputting the cooling demand power according to the specific heat capacity of the battery cell, the heating power of the battery cell, the current actual temperature, the ambient temperature and the control parameters.

[0115] As a possible implementation method, the vehicle terminal inputs the specific heat capacity of the battery cell, the heating power of the battery cell, the current actual temperature, the ambient temperature and the control parameters into the total cooling power demand formula to obtain the total cooling power demand.

[0116] Exemplarily, the total cooling power required is shown in the following formula 3.

[0117] Formula three.

[0118] in, is the total cooling power required, is the specific heat capacity of the battery cell, is the target temperature, is the current actual temperature, is the target duration, is the heating power after filtering, is the ambient temperature, is the environmental exchange coefficient, is the number of single cells in the battery pack.

[0119] Based on the above technical means, the cooling demand is determined according to the current actual temperature, ambient temperature and temperature control parameters. In this way, the environmental heat dissipation is comprehensively considered, and it has strong adaptability to complex environmental factors, thereby accurately managing the cooling of the battery pack and better protecting the battery.

[0120] It can be understood that the cooling requirement is determined based on the regulated heat value, heat exchange value and calorific value of the battery pack, and the cooling requirement represents the relationship between the heat dissipation and the heat generation of the battery pack. The cooling requirement obtained is more accurate by comprehensively considering the environmental heat dissipation and the regulation capability of the battery pack. Therefore, it is possible to simply and effectively determine whether it is necessary to cool the battery in the discharge state.

[0121] In one design, in order to accurately perform thermal management on the battery pack, the battery pack is provided with a cooling system, and the above S303 includes: S3031.

[0122] S3031. When the cooling demand is greater than or equal to a preset threshold, the temperature of the cooling medium in the cooling system is adjusted according to the current actual temperature, control parameters, and the ambient temperature of the environment in which the battery pack is located, and the adjusted temperature is less than the target temperature.

[0123] As a possible implementation method, the vehicle terminal determines whether the cooling demand is greater than or equal to a preset threshold. If the cooling demand is greater than or equal to the preset threshold, the temperature of the cooling medium in the cooling system is adjusted according to the current actual temperature, control parameters, and the ambient temperature of the battery pack. If the cooling demand is less than the preset threshold, the battery pack is not cooled.

[0124] In some embodiments, when the cooling demand is greater than or equal to a preset threshold, the vehicle terminal starts the cooling system of the battery pack and obtains the outlet target temperature of the cooling medium at the battery pack outlet according to the current actual temperature, temperature control parameters and ambient temperature. Further, the vehicle terminal controls the temperature of the cooling medium flowing out of the battery pack outlet to be the outlet target temperature.

[0125] Exemplarily, the outlet target temperature satisfies the following formula 4.

[0126] Formula 4.

[0127] in, is the outlet target temperature, is the specific heat capacity of the battery cell, is the target temperature, is the current actual temperature, is the target duration, is the heating power after filtering, is the ambient temperature, is the environmental exchange coefficient, is the medium exchange coefficient between the battery and the cooling medium.

[0128] In some embodiments, in the embodiments of the present application, when the battery cooling conditions are met, the temperature or cooling power of the cooling medium required for the current cooling is calculated: According to Fourier's law, the rate at which the battery transfers heat to the environment is proportional to the temperature difference.

[0129] For example, Figure 5 As shown, Figure 5 FIG. 1 is a schematic diagram of a battery heat exchange according to an exemplary embodiment. Figure 5 The heat transfer between the cells is ignored.

[0130] exist Figure 5 The temperature of the cooling medium is The heat exchange formula between the single battery and the cooling medium can be the first heat exchange formula: .in, is the current actual temperature, is the medium exchange coefficient between the battery and the cooling medium, is the heat exchange amount between the single battery and the cooling medium, and t is the heat exchange time between the single battery and the cooling medium.

[0131] exist Figure 5 The ambient temperature is The heat exchange formula between the single cell and the environment can be the second heat exchange formula: .in, is the current actual temperature, is the medium exchange coefficient between the battery and the cooling medium, is the heat exchange amount between the single battery and the cooling medium, and t is the heat exchange time between the single battery and the cooling medium.

[0132] exist Figure 5The battery heat exchange schematic diagram shows that the thermal management control strategy for the entire pack is mapped out by calculating the temperature change of a single battery cell. Because the control goal is to make the maximum temperature of the battery not exceed the target temperature, only the single battery cell with the highest temperature needs to be calculated. In this way, the environmental contamination formula obtained according to the first heat exchange formula and the second heat exchange formula is shown in the following formula 5.

[0133] Formula five.

[0134] in, is the battery temperature change rate, is the specific heat capacity of the battery cell, is the temperature of the cooling medium, is the current actual temperature, is the heating power after filtering, is the ambient temperature, is the environmental exchange coefficient, is the medium exchange coefficient between the battery and the cooling medium.

[0135] Need to explain, , The calculation can be performed using the structural parameters of the battery pack, or identification can be performed based on the test data of the battery pack.

[0136] Furthermore, since the ambient heat transfer formula can characterize the instantaneous state change of the battery pack, the temperature of the cooled battery does not exceed the target temperature T1 within the target time t1, the current demand can be expressed as (T1-T) / t1=dT / dt. Substituting it into the ambient heat transfer formula, the formula for determining the outlet temperature can be obtained.

[0137] In other embodiments, when determining the outlet target temperature of the cooling medium, the vehicle terminal takes into account the inlet and outlet temperature difference of the cooling medium, the flow rate of the cooling medium, and the specific heat capacity of the cooling medium. When the flow rate of the cooling medium is constant, the inlet and outlet temperature difference of the cooling medium and the specific heat capacity of the cooling medium are proportional to the cooling power and the temperature difference between the cooling medium temperature and the battery. In this way, it can be obtained that: the inlet and outlet temperature difference of the cooling medium T2 = A3 (T-Tw1). Among them, A3 is the temperature difference ratio coefficient of the inlet and outlet temperature difference and the temperature difference between the cooling medium temperature and the battery temperature. The temperature difference ratio coefficient is a coefficient pre-configured in the vehicle terminal.

[0138] Furthermore, the vehicle terminal obtains the inlet temperature of the cooling medium according to the temperature difference between the inlet and outlet of the cooling circuit and the outlet temperature of the cooling medium. . is the outlet temperature of the cooling medium, is the temperature difference between the inlet and outlet of the cooling medium.

[0139] In other embodiments, the vehicle terminal obtains the inlet target temperature of the cooling medium at the inlet of the battery pack based on the current actual temperature of the battery pack, the temperature control parameter, and the ambient temperature of the environment in which the battery pack is located. Further, the vehicle terminal configures the cooling medium temperature at the inlet of the battery pack as the inlet target temperature.

[0140] Exemplarily, the inlet target temperature of the cooling medium satisfies the following formula 6.

[0141] Formula six.

[0142] in, is the target inlet temperature, is the specific heat capacity of the battery cell, is the target temperature, is the current actual temperature, is the target duration, is the heating power after filtering, is the ambient temperature, is the environmental exchange coefficient, is the medium exchange coefficient between the battery and the cooling medium, is the temperature difference proportional coefficient.

[0143] In some embodiments, when the outlet target temperature is greater than the upper temperature threshold, the outlet target temperature is adjusted, and the adjusted outlet target temperature controls the outlet temperature of the cooling medium at the battery pack. For example, the upper temperature threshold is set as the outlet target temperature.

[0144] Alternatively, when the inlet target temperature is less than the lower temperature threshold, the inlet target temperature is adjusted, and the adjusted inlet target temperature controls the inlet temperature of the cooling medium at the battery pack. For example, the lower temperature threshold is set as the outlet target temperature.

[0145] In the embodiment of the present application, the temperature of the battery pack after the target cooling time is controlled to be below the target temperature by cooling the battery pack. If the current maximum temperature of the battery pack is higher than the target temperature, the temperature of the battery pack is lowered to below the target temperature after the target time. If the current battery temperature is lower than the target temperature, the temperature of the battery pack is protected from rising above the target temperature after the target time.

[0146] In some embodiments, in order to better understand the battery cooling method provided by the embodiments of the present application, Figure 6 FIG. 1 is a schematic diagram of battery discharge current under a test condition according to an exemplary embodiment. Figure 6 , a schematic diagram of the change of discharge current within the target time is shown. Figure 6 , Figure 7FIG. 1 is a schematic diagram of battery cooling for battery discharge under a test condition according to an exemplary embodiment. Figure 7 In the figure, the change lines of the maximum battery temperature, the minimum battery temperature, the target temperature of the battery water inlet, and the actual temperature of the battery water inlet are shown. Figure 7 The data shown are control unit area network (CAN) signal data collected by the battery management system software when performing a cooling test in combination with the battery cooling method in the embodiment of the present application.

[0147] In addition, Figure 7 The target temperature of the control is a comprehensive consideration of factors such as the battery's service life and discharge capacity. Figure 7 The target temperature shown in the figure is 44°C, which can meet the battery pack life warranty and is the temperature value with the maximum allowable discharge power.

[0148] The shorter the control target time is set, the more intense the response of the target cooling medium to the battery temperature will be when the temperature approaches the target temperature. If the target time is set too long, it will be difficult to achieve the expected cooling effect in a short time. Figure 7 The target duration is shown in FIG. 6000 s.

[0149] Combination Figure 7 It can be seen that the cooling system controls the battery inlet temperature and the control target temperature well. The maximum temperature of the battery is also controlled around the target. A lower target water temperature is sent in the early period when the heat production is high, and a higher target water temperature is sent in the later period when the heat production is low. In this way, the battery cooling method provided in the embodiment of the present application can achieve the purpose of saving the power consumption of the cooling system as much as possible and meeting the cooling temperature control through real-time judgment.

[0150] In order to better understand the battery cooling method provided in the embodiment of the present application, Figure 8 As shown, Figure 8 The present invention is a schematic diagram of a battery cooling process according to an exemplary embodiment, including: S801-S808.

[0151] S801: Determine temperature control parameters according to the current discharge performance mode and the remaining power of the battery.

[0152] Among them, the temperature control parameters include target temperature and target duration.

[0153] This step is detailed in S301 above and will not be repeated here.

[0154] S802: Determine whether the battery pack is in a dischargeable state and is not connected to a charging gun.

[0155] If yes, then execute S803. If no, then end.

[0156] S803: Calculate the heating power of the single cell.

[0157] In some embodiments, the vehicle-mounted terminal calculates the heating power of a single battery cell in real time or periodically.

[0158] This step is detailed in S3021 above and will not be repeated here.

[0159] S804: Filter the heating power to obtain filtered heating power.

[0160] This step is detailed in S3021 above and will not be repeated here.

[0161] S805: Determine a cooling demand value according to the filtered heating power.

[0162] This step is detailed in S302 above and will not be described again here.

[0163] S806: Determine whether the cooling demand value is greater than a preset threshold.

[0164] If yes, execute S807. If no, end.

[0165] S807: Perform cooling management on the battery pack.

[0166] This step is detailed in S303 and S3031 above and will not be repeated here.

[0167] S808, end.

[0168] The battery cooling method provided in the embodiment of the present application brings at least the following beneficial effects: 1) It can simply and effectively determine whether it is necessary to cool the battery in the discharge state. 2) It has strong adaptability to complex environmental factors. Accurately evaluate the working conditions where the battery generates low heat and does not require cooling, and request appropriate cooling capacity from the thermal management system during cooling to save energy; for scenarios where the battery discharge power is high and the ambient temperature is high, start cooling in advance to better protect the battery from overheating. 3) There is no need for a large number of repeated experiments to verify the fixed temperature threshold, saving R&D costs.

[0169] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to achieve the above functions, the communication device includes a hardware structure and / or software module corresponding to each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present application.

[0170] Fig. 9 FIG. 1 is a schematic diagram showing a battery cooling device according to an exemplary embodiment. Fig. 9 The battery cooling device 90 includes: an acquisition unit 901 , a determination unit 902 and a processing unit 903 .

[0171] The acquisition unit 901 is used to acquire the temperature control parameters of the battery pack. The temperature control parameters are used to indicate that the temperature of the battery pack is controlled not to exceed the target temperature within the target time. The determination unit 902 is used to determine the cooling demand of the battery pack according to the current temperature information of the battery pack and the temperature control parameters. The processing unit 903 is used to perform cooling management on the battery pack according to the cooling demand.

[0172] In one possible manner, the current temperature information includes the current actual temperature of the battery pack and the ambient temperature of the battery pack. The determination unit 902 is configured to: obtain the heating power of the battery pack and determine the cooling demand according to the heating power, the current actual temperature, the ambient temperature and the control parameters.

[0173] In one possible manner, the cooling demand includes a total cooling demand power, and the battery pack includes a plurality of battery cells. The determination unit 902 is configured to: for each of the plurality of battery cells, determine the cooling demand power of the battery cell according to the specific heat capacity of the battery cell, the heating power of the battery cell, the current actual temperature, the ambient temperature, and the control parameter. Determine the total cooling demand power according to the cooling demand powers of the plurality of battery cells.

[0174] In one possible manner, the determination unit 902 is used to: determine the regulation power of the battery pack according to the current actual temperature, the specific heat capacity of the battery cell, the target duration, and the target temperature. The regulation power is the exothermic power or the endothermic power. The heat exchange power between the battery pack and the environment is determined according to the preset environmental exchange coefficient, the ambient temperature, and the current actual temperature. The cooling demand power of the battery cell is determined according to the regulation power, the heat exchange power, and the heating power of the battery cell.

[0175] In a possible manner, the determination unit 902 is further configured to determine the temperature control parameter according to the state of charge SOC of the battery pack and the current cooling mode of the battery pack.

[0176] In one possible manner, the determination unit 902 is configured to: determine the temperature control parameters including the first target duration and the first target temperature when the state of charge SOC of the battery pack is greater than or equal to the first power threshold; and determine the temperature control parameters according to the current cooling mode of the battery pack when the state of charge SOC of the battery pack is less than the first power threshold.

[0177] In one possible manner, when the state of charge SOC of the battery pack is less than the first power threshold, the determination unit 902 is used to: determine the second temperature control parameter when the state of charge SOC of the battery pack is less than the first power threshold and the current cooling mode is the first cooling mode. The second temperature control parameter is used to indicate that the temperature of the battery pack is controlled not to exceed the second target temperature within the second target duration. It includes the second target duration and the second target temperature. Among them, the first target duration is greater than the second target duration, and the first target temperature is greater than the second target temperature. When the state of charge SOC of the battery pack is less than the first power threshold and the current cooling mode is the second cooling mode, the temperature control parameter is determined. The temperature control parameters include a third target duration and a third target temperature. The power consumption of the first cooling mode is less than that of the second cooling mode, the second target duration is greater than the third target duration, and the second target temperature is greater than the third target temperature.

[0178] In one possible manner, the determination unit 902 is configured to determine the temperature control parameter according to the state of charge SOC of the battery pack and the current cooling mode of the battery pack when the battery pack is in a dischargeable state and the battery pack is not connected to a charging device.

[0179] In one possible embodiment, the battery pack is provided with a cooling system, and the processing unit 903 is specifically used to: when the cooling demand is greater than or equal to a preset threshold, adjust the temperature of the cooling medium in the cooling system according to the current actual temperature, control parameters, and the ambient temperature of the environment in which the battery pack is located, and the adjusted temperature is less than the target temperature.

[0180] Fig.10 FIG. 1 is a schematic diagram showing the structure of a vehicle-mounted terminal according to an exemplary embodiment. Fig.10 As shown, the vehicle-mounted terminal includes but is not limited to: a processor 1001 and a memory 1002 .

[0181] The memory 1002 is used to store executable instructions of the processor 1001. It can be understood that the processor 1001 is configured to execute instructions to implement the battery cooling method in the above embodiment.

[0182] The processor 1001 is the control center of the vehicle terminal. It uses various interfaces and lines to connect various parts of the entire vehicle terminal. By running or executing software programs and / or modules stored in the memory 1002, and calling data stored in the memory 1002, it executes various functions of the vehicle terminal and processes data, thereby monitoring the vehicle terminal as a whole. The processor 1001 may include one or more processing units. Optionally, the processor 1001 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 1001.

[0183] The memory 1002 may be used to store software programs and various data. The memory 1002 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one functional module (such as a determination unit, a processing unit, etc.), etc. In addition, the memory 1002 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0184] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 1002 including instructions. The above instructions can be executed by the processor 1001 of the vehicle terminal to implement the method in the above embodiment.

[0185] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0186] In an exemplary embodiment, the embodiment of the present application also provides a computer program product including one or more instructions, and the one or more instructions can be executed by the processor 1001 of the vehicle terminal to complete the method in the above embodiment.

[0187] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the processor of the vehicle terminal, the various processes of the above-mentioned method embodiment are implemented, and the same technical effect as the above-mentioned method can be achieved. To avoid repetition, they will not be repeated here.

[0188] Through the description of the above implementation methods, technical personnel in the relevant field can clearly 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 assigned to 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.

[0189] In the several embodiments provided in the present 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 only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, 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.

[0190] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0191] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0192] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the full classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute the full classification part or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, ROM, RAM, disk or CD and other media that can store program code.

[0193] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery cooling method, characterized in that: The method comprises: Acquire a temperature control parameter of the battery pack; the temperature control parameter is used to indicate that the temperature of the battery pack is controlled to not exceed a target temperature within a target time period; Determining a cooling requirement of the battery pack according to the current temperature information of the battery pack and the temperature control parameter; The battery pack is cooled and managed according to the cooling demand.

2. The battery cooling method according to claim 1, characterized in that: The current temperature information includes the current actual temperature of the battery pack and the ambient temperature of the battery pack; determining the cooling demand of the battery pack according to the current temperature information of the battery pack and the temperature control parameter, including: Obtaining the heating power of the battery pack; The cooling demand is determined according to the heating power, the current actual temperature, the ambient temperature and the control parameter.

3. The battery cooling method according to claim 2, characterized in that: The cooling demand includes a total cooling demand power, and the battery pack includes a plurality of battery cells; and determining the cooling demand according to the heating power, the current actual temperature, the ambient temperature, and the control parameter includes: For each of the plurality of battery cells, determining a cooling power requirement of the battery cell according to the specific heat capacity of the battery cell, the heating power of the battery cell, the current actual temperature, the ambient temperature, and the control parameter; The total cooling demand power is determined according to the cooling demand powers of the multiple battery cells.

4. The battery cooling method according to claim 3, characterized in that: Determining the cooling power requirement of the battery cell according to the specific heat capacity of the battery cell, the heating power of the battery cell, the current actual temperature, the ambient temperature, and the control parameter, including: Determine the regulation power of the battery pack according to the current actual temperature, the specific heat capacity of the battery cell, the target duration and the target temperature; the regulation power is exothermic power or endothermic power; Determining the heat exchange power between the battery pack and the environment according to a preset environmental exchange coefficient, the environmental temperature and the current actual temperature; The cooling power requirement of the battery cell is determined according to the adjustment power, the heat exchange power and the heating power of the battery cell.

5. The battery cooling method according to any one of claims 1 to 3, characterized in that: The method further comprises: The temperature control parameter is determined according to the state of charge (SOC) of the battery pack and a current cooling mode of the battery pack.

6. The battery cooling method according to claim 5, characterized in that: Determining the temperature control parameter according to the state of charge SOC of the battery pack and the current cooling mode of the battery pack includes: When the state of charge (SOC) of the battery pack is greater than or equal to a first power threshold, determining that the temperature control parameters include a first target duration and a first target temperature; When the state of charge (SOC) of the battery pack is less than the first power threshold, the temperature control parameter is determined according to a current cooling mode of the battery pack.

7. The battery cooling method according to claim 6, characterized in that: Determining the temperature control parameter according to the current cooling mode of the battery pack includes: In the case where the current cooling mode is the first cooling mode, determining a second temperature control parameter; the second temperature control parameter includes a second target duration and a second target temperature; wherein the first target duration is greater than the second target duration, and the first target temperature is greater than the second target temperature; When the current cooling mode is the second cooling mode, the temperature control parameters are determined; the temperature control parameters include a third target duration and a third target temperature; the power consumption of the first cooling mode is less than that of the second cooling mode, the second target duration is greater than the third target duration, and the second target temperature is greater than the third target temperature.

8. The battery cooling method according to claim 6, characterized in that: Determining the temperature control parameter according to the state of charge SOC of the battery pack and the current cooling mode of the battery pack includes: When the battery pack is in a dischargeable state and the battery pack is not connected to a charging device, the temperature control parameter is determined according to a state of charge (SOC) of the battery pack and a current cooling mode of the battery pack.

9. The battery cooling method according to any one of claims 1 to 3, characterized in that: The battery pack is provided with a cooling system, and the cooling system is used to adjust the temperature of the battery pack and perform cooling management on the battery pack according to the cooling demand, including: When the cooling demand is greater than or equal to a preset threshold, the temperature of the cooling medium in the cooling system is adjusted according to the current actual temperature, the control parameters, and the ambient temperature of the environment in which the battery pack is located, and the adjusted temperature is less than the target temperature.

10. A battery cooling device, characterized in that: The device comprises: an acquisition unit, a determination unit and a processing unit; The acquisition unit is used to acquire a temperature control parameter of the battery pack; the temperature control parameter is used to indicate that the temperature of the battery pack is controlled to not exceed a target temperature within a target time period; The determining unit is used to determine the cooling requirement of the battery pack according to the current temperature information of the battery pack and the temperature control parameter; The processing unit is used to perform cooling management on the battery pack according to the cooling demand.

11. A vehicle-mounted terminal, characterized in that: including memory and processor; The memory is coupled to the processor; The memory is used to store computer program code, wherein the computer program code includes computer instructions; When the processor executes the computer instructions, the vehicle-mounted terminal executes the battery cooling method as described in any one of claims 1-9.

12. A vehicle, characterized in that: Comprising the vehicle-mounted terminal as claimed in claim 11.

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