Battery Cooling Method, Device, Vehicle-mounted Terminal, and Vehicle

Abstract

The present application relates to a battery cooling method, device, vehicle-mounted terminal, and vehicle, and relates to the technical field of vehicles. The method includes: obtaining temperature control parameters of a battery pack; the temperature control parameters are used to indicate that the temperature of the battery pack is controlled not to exceed a target temperature within a target duration; determining a refrigeration demand of the battery pack according to the current temperature information of the battery pack and the temperature control parameters; and performing cooling management on the battery pack according to the refrigeration demand. It is used to improve the safety of battery operation.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, especially the technical field of batteries, and particularly relates to a battery cooling method, device, vehicle-mounted terminal, and vehicle. Background Art

[0002] In recent years, electric vehicles have developed rapidly. As a key component of electric vehicles, power batteries have also seen rapid technological development. To ensure the safety, discharge performance, and lifespan performance of batteries when used at high temperatures, it is necessary to cool the batteries.

[0003] Related technical solutions disclose a battery thermal management method for an electric vehicle based on model predictive control. This battery thermal management method establishes a system model of battery thermal management including multi-state estimation of battery electricity-thermal-aging and a cooling system, and combines algorithms and models such as a state estimator of a model predictive controller, a cost function, and a vehicle speed prediction model to set a reference value for the optimal cooling temperature of the battery. Related technical solutions also disclose a battery thermal management control method that predicts the user's vehicle usage time and balances the energy consumption required for battery temperature control and driving to determine the optimal temperature value at the start of a journey.

[0004] It can be seen that due to the increasing importance of thermal management of power batteries for electric vehicles, various battery cooling methods have emerged. Currently, usually, when the temperature of the battery reaches a preset temperature, the battery starts to be cooled. In this way, the battery is cooled only when it reaches a relatively high temperature, and the battery cannot be better protected. Summary of the Invention

[0005] The present application provides a battery cooling method, device, vehicle-mounted terminal, and vehicle to improve the safety of battery operation. The technical solution of the present application is as follows:

[0006] According to a first aspect provided by the present application, a battery cooling method is provided. The method includes: obtaining temperature control parameters of a battery pack. The temperature control parameters are used to indicate that the temperature of the battery pack is controlled not to exceed a target temperature within a target duration. According to the current temperature information of the battery pack and the temperature control parameters, determining the refrigeration demand of the battery pack. Cooling management is performed on the battery pack according to the refrigeration demand.

[0007] 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. Further, 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 duration is determined, and the battery pack is cooled and managed according to the cooling demand. In this way, when the battery pack needs cooling capacity to reach the target temperature, 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.

[0008] In a possible way, the current temperature information includes the current actual temperature of the battery pack and the ambient temperature where the battery pack is located. Determining the cooling demand of the battery pack according to the current temperature information of the battery pack and the temperature control parameters includes: obtaining the heat generation power of the battery pack. The cooling demand is determined according to the heat generation power, the current actual temperature, the ambient temperature and the control parameters.

[0009] Based on the above technical means, the cooling demand is determined according to the current actual temperature, the ambient temperature and the temperature control parameters. In this way, the environmental heat dissipation is comprehensively considered, and it has strong adaptability to complex environmental factors, and then the battery pack can be accurately cooled and managed to better protect the battery.

[0010] In a possible way, the cooling demand includes the total cooling demand power, and the battery pack includes multiple battery cells. Determining the cooling demand according to the heat generation power, the current actual temperature, the ambient temperature and the control parameters includes: for each battery cell in the multiple battery cells, determining the cooling demand power of the battery cell according to 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 according to the cooling demand powers of the multiple battery cells.

[0011] 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 adjustment ability of the battery pack is comprehensively considered, making the obtained cooling demand more accurate.

[0012] In a possible way, determining the cooling demand power of the battery cell according to 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 includes: 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 heat release power or the heat absorption 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 heat generation power of the battery cell.

[0013] Based on the above technical means, the refrigeration demand is determined according to the adjusted calorific value, heat exchange value of the battery pack and the calorific value of the battery pack, and the refrigeration demand represents the relationship between the heat dissipation and heat generation of the battery pack. Considering the environmental heat dissipation and the adjustment ability of the battery pack comprehensively, the obtained refrigeration demand is more accurate. Thus, it can be simply and effectively judged whether it is necessary to cool the battery in the discharging state.

[0014] In one possible way, the method further includes: determining a temperature control parameter according to the state of charge (SOC) of the battery pack and the current cooling mode of the battery pack.

[0015] In one possible way, 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 the first power threshold, determining that the temperature control parameter includes 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 the current cooling mode of the battery pack.

[0016] In one possible way, determining the temperature control parameter according to the current cooling mode of the battery pack includes: when 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, determining the temperature control parameter. 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.

[0017] Based on the above technical means, 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 small, the temperature approaching line reached by the battery pack is increased to reduce the cooling energy consumption.

[0018] In one possible way, 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, 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.

[0019] In a possible way, the battery pack is provided with a cooling system, which is used to adjust the temperature of the battery pack and perform cooling management on the battery pack according to the refrigeration demand, including: when the refrigeration 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 where the battery pack is located, and the adjusted temperature is less than the target temperature.

[0020] According to the second aspect provided by the present application, a battery cooling device is provided. The battery cooling device includes: 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 duration. The determination unit is used to determine the refrigeration 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 refrigeration demand.

[0021] In a possible way, the current temperature information includes the current actual temperature of the battery pack and the ambient temperature of the environment where the battery pack is located. The determination unit is configured to: acquire the heat generation power of the battery pack. Determine the refrigeration demand according to the heat generation power, the current actual temperature, the ambient temperature, and the control parameters.

[0022] In a possible way, the refrigeration demand includes the total refrigeration demand power, and the battery pack includes multiple battery cells. The determination unit is configured to: for each battery cell among the multiple battery cells, determine the refrigeration demand power of the battery cell according to 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. Determine the total refrigeration demand power according to the refrigeration demand powers of the multiple battery cells.

[0023] In a possible way, the determination unit is configured to: determine 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 heat release power or the heat absorption power. Determine the heat exchange power between the battery pack and the environment according to the preset environment exchange coefficient, the ambient temperature, and the current actual temperature. Determine the refrigeration demand power of the battery cell according to the adjustment power, the heat exchange power, and the heat generation power of the battery cell.

[0024] In a possible way, the determination unit is further configured to determine the temperature control parameters according to the state of charge SOC of the battery pack and the current cooling mode of the battery pack.

[0025] In a possible way, the determination unit is configured to: when the state of charge SOC of the battery pack is greater than or equal to the first power threshold, determine that the temperature control parameters include 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, determine the temperature control parameters according to the current cooling mode of the battery pack.

[0026] In one possible way, a determination unit is configured to: when the current cooling mode is the first cooling mode, determine a second temperature control parameter. The second temperature control parameter is used to indicate that the temperature of the battery pack is controlled not to exceed a second target temperature within a second target duration. The second target duration and the second target temperature are included. 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, determine a temperature control parameter. 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.

[0027] In one possible way, a determination unit is configured to: when the battery pack is in a dischargeable state and not connected to a charging device, determine a temperature control parameter according to the state of charge (SOC) of the battery pack and the current cooling mode of the battery pack.

[0028] In one possible way, the battery pack is provided with a cooling system for adjusting the temperature of the battery pack. A processing unit is specifically configured to: when the refrigeration 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, the control parameter, and the ambient temperature of the environment where the battery pack is located, and the adjusted temperature is less than the target temperature.

[0029] According to the third aspect provided by the present application, a vehicle-mounted terminal is provided, including: a processor; a memory for storing instructions executable by the processor; wherein, the processor is configured to execute the instructions to implement the method according to the first aspect and any possible implementation manner thereof.

[0030] 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-mounted terminal, the vehicle-mounted terminal is caused to execute the method according to the first aspect and any possible implementation manner thereof.

[0031] According to the fifth aspect provided by the present application, a computer program product is provided. The computer program product includes computer instructions. When the computer instructions run on the vehicle-mounted terminal, the vehicle-mounted terminal is caused to execute the method according to the first aspect and any possible implementation manner thereof.

[0032] According to the sixth aspect provided by the present application, a vehicle is provided. The vehicle includes the vehicle-mounted terminal according to the third aspect.

[0033] It should be noted that the technical effects brought by any implementation manner in the second aspect to the sixth aspect can be referred to the technical effects brought by the corresponding implementation manner in the first aspect, which will not be elaborated here.

[0034] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this application. Brief Description of the Drawings

[0035] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application, and do not constitute an improper limitation of this application.

[0036] Figure 1 is a schematic structural diagram of a battery control system shown according to an exemplary embodiment;

[0037] Figure 2 is a schematic structural diagram of a cooling system shown according to an exemplary embodiment;

[0038] Figure 3 is one of the schematic flowcharts of a battery cooling method shown according to an exemplary embodiment;

[0039] Figure 4 is a schematic diagram of the heat generation amount and filtering effect of the battery cells of a single battery shown according to an exemplary embodiment;

[0040] Figure 5 is a schematic diagram of battery heat exchange shown according to an exemplary embodiment;

[0041] Figure 6 is a schematic diagram of the battery discharge current under a test condition shown according to an exemplary embodiment;

[0042] Figure 7 is a schematic diagram of battery cooling during battery discharge under a test condition shown according to an exemplary embodiment;

[0043] Figure 8 is the second of the schematic flowcharts of a battery cooling method shown according to an exemplary embodiment;

[0044] Figure 9 is a schematic structural diagram of a battery cooling device shown according to an exemplary embodiment;

[0045] Figure 10 is a schematic structural diagram of a vehicle-mounted terminal shown according to an exemplary embodiment. Detailed Description of the Embodiments

[0046] In order to enable those of ordinary skill in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the drawings.

[0047] It should be noted that in the description of the present application, the specification, the claims and the above drawings, the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances 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 appended claims.

[0048] As described in the background art, currently, generally, when the temperature of the battery reaches a preset temperature, the battery is cooled. In this way, the battery is cooled only when it reaches a relatively high temperature, and the battery cannot be better protected. For example, in the 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, resulting in a relatively late cooling of the battery, and the battery temperature will continue to increase for a period of time. In this way, the safety of the battery operation is affected.

[0049] To solve the above technical problems, an embodiment of the present application provides a battery cooling method, which includes: obtaining temperature control parameters of a battery pack. The temperature control parameters are used to indicate that the temperature of the battery pack is controlled not to exceed a target temperature within a target duration. According to the current temperature information of the battery pack and the temperature control parameters, determine the refrigeration demand of the battery pack. According to the refrigeration demand, perform cooling management on the battery pack.

[0050] In this way, obtain the temperature control parameters of the battery pack, and determine the required cooling capacity of the battery pack according to the current temperature information and the temperature control parameters. Further, perform cooling management on the battery pack according to the refrigeration demand. In this way, determine the refrigeration demand for the battery pack to reach the target temperature from the current temperature within the target duration, and perform cooling management on the battery pack according to the refrigeration demand. In this way, when the battery pack needs cooling capacity to reach the target temperature, cooling is started in advance, and the battery is cooled in a timely manner, 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.

[0051] As Figure 1 shown, Figure 1 FIG. 16 is a schematic structural diagram of a battery control system 100 according to an exemplary embodiment. The battery control system 100 may include an in-vehicle terminal 101 and a battery pack 102. The in-vehicle terminal 101 is communicatively connected to the battery pack 102.

[0052] In some embodiments, the battery control system 100 may further include a temperature sensor. The in-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.

[0053] In some embodiments, the in-vehicle terminal 101 is further configured to obtain the temperature control parameter of the battery pack 102. The temperature control parameter is used to indicate that the temperature of the battery pack 102 is controlled not to exceed the target temperature within the target duration. The in-vehicle terminal 101 is further configured to determine the cooling demand of the battery pack 102 according to the current temperature information of the battery pack 102 and the temperature control parameter. The battery pack 102 is cooled and managed according to the cooling demand.

[0054] In some other embodiments, the in-vehicle terminal 101 includes a memory. The temperature control parameter is stored in the memory.

[0055] In some embodiments, the in-vehicle terminal cools the battery pack 102 through the cooling system of the battery pack.

[0056] Exemplarily, as Figure 2 shown, Figure 2 FIG. 16 is a schematic structural diagram of a cooling system 200 shown 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 respectively connected to the condenser 203 and the battery cooler 205, and the expansion valve 204 is respectively connected to the condenser 203 and the battery cooler 205. The battery pack 102 is connected to the battery cooler 205.

[0057] When the battery cooling system 200 is started, after the coolant passes through the compressor 202, the condenser 203, the expansion valve 204, and the battery cooler 205, it enters the battery pack 102 through the inlet of the battery pack 102 to cool the battery pack 102. Subsequently, it flows out from the outlet of the battery pack 102, passes through the battery cooler 205, and then returns to the compressor 202.

[0058] It should be noted that in the embodiments of the present application, the cooling system 200 mainly controls the temperature or refrigeration power of the cooling medium, and does not limit the control method of the specific cooling system and the compressor 202. The cooling system 200 is not limited to Figure 2 the shown cooling architecture, and is also applicable to other similar cooling architectures.

[0059] The in-vehicle terminal 101 in the embodiments of the present application may be a control device in the thermal management system of the vehicle, or may be the main control device of the vehicle. The embodiments of the present application do not make specific limitations thereto.

[0060] For ease of understanding, the battery cooling method provided by the present application will be specifically introduced below with reference to the accompanying drawings.

[0061] Figure 3 It is a schematic flowchart of a battery cooling method shown according to an exemplary embodiment. The method includes: S301 - S303.

[0062] S301. Obtain the temperature control parameters of the battery pack.

[0063] Among them, 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 duration.

[0064] In the embodiments 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.

[0065] As a possible implementation manner, the vehicle-mounted terminal obtains the 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.

[0066] In the embodiments 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.

[0067] In some embodiments, the vehicle-mounted terminal determines the control parameters according to the battery parameters and the target correspondence relationship. The target correspondence relationship includes multiple battery parameters and the temperature control parameters corresponding to each battery parameter.

[0068] For example, the vehicle-mounted 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.

[0069] Exemplarily, taking the SOC of the battery pack as 25% as an example. The vehicle-mounted terminal determines according to the correspondence table that the target temperature corresponding to the remaining power of 25% is 44 °C, and the target duration is 600 seconds. The example of the correspondence table is shown in Table 1 below.

[0070] Table 1 Correspondence Table

[0071]

[0072] In some embodiments, the vehicle-mounted terminal determines the temperature control parameters according to the battery parameters and the parameter determination function. Among them, 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 state of charge of the battery is low, setting a longer temperature control duration to reduce the cooling time can reduce the cooling energy consumption.

[0073] For example, the vehicle-mounted terminal inputs the SOC and voltage of the battery pack into the parameter determination function to obtain the target temperature.

[0074] It should be noted that the target correspondence and the parameter determination function are pre-stored in the vehicle-mounted terminal.

[0075] In some embodiments, the vehicle-mounted 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. For details of this step, please refer to the following embodiments and will not be elaborated here.

[0076] In some embodiments, before determining the temperature control parameter, the vehicle-mounted terminal obtains the state of the battery pack, and determines the temperature control parameter when the state of the battery pack meets the preset condition.

[0077] For example, the vehicle-mounted terminal determines whether the battery pack is currently in a dischargeable state and the charging gun is not connected. If so, it determines the temperature control parameter of the battery pack according to the battery parameters of the battery pack, and performs cooling management on the battery pack according to the temperature control parameter. Otherwise, it does not perform cooling management on the battery pack.

[0078] As another possible implementation, the vehicle-mounted terminal obtains the temperature control parameter from the memory.

[0079] In some embodiments, when the battery pack is currently in a dischargeable state and the charging gun is not connected, the vehicle-mounted terminal obtains the temperature control parameter from the memory.

[0080] S302. Determine the refrigeration demand of the battery pack according to the current temperature information of the battery pack and the temperature control parameter.

[0081] Among them, the refrigeration demand can be used to characterize the refrigeration capacity required by the battery pack within the target duration. For example, the refrigeration demand can include the refrigeration demand heat or the refrigeration demand power.

[0082] In some embodiments, the current temperature information includes the current actual temperature of the battery pack and the ambient temperature where the battery pack is located. The vehicle-mounted terminal obtains the heat generation power of the battery pack, and determines the refrigeration demand according to the heat generation power, the current actual temperature, the ambient temperature and the control parameter. For details of this step, please refer to the following embodiments and will not be elaborated here.

[0083] In some other embodiments, the vehicle-mounted terminal obtains the current temperature information, and inputs the current temperature information, the target duration and the target temperature into the refrigeration capacity model to obtain the refrigeration demand.

[0084] In the embodiments of the present application, the cooling demand of the battery pack is the amount of cooling required to adjust the temperature of the battery pack from the current actual temperature to the target temperature within the target duration. Subsequently, if the amount of cooling is small, the cooling system may not be started. Otherwise, the cooling system needs to be started to cool the battery pack.

[0085] S303. Perform cooling management on the battery pack according to the cooling demand.

[0086] As a possible implementation manner, when the vehicle-mounted terminal obtains the cooling demand value, it determines whether the cooling demand value meets the battery cooling condition, and performs cooling management on the battery pack when the cooling demand meets the battery cooling condition. When the cooling demand does not meet the battery cooling condition, no cooling management is performed on the battery pack.

[0087] In the embodiments of the present application, the cooling demand meeting the battery cooling condition means that the total cooling demand heat is greater than the heat threshold and / or the total cooling demand power is greater than the power threshold.

[0088] 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, and the embodiments of the present application do not limit this.

[0089] In some embodiments, when the cooling demand of the vehicle-mounted terminal 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, the control parameter, and the ambient temperature of the environment where the battery pack is located, and the adjusted temperature is less than the target temperature.

[0090] Details of this step are described in the following embodiments and will not be elaborated here.

[0091] In some embodiments, when the cooling demand of the vehicle-mounted terminal meets the battery cooling condition, the cooling demand is determined as the total cooling demand, and the cooling medium is cooled according to the total cooling demand. In this way, the cooled cooling medium takes away the corresponding heat generated by the battery pack, and the temperature of the battery pack is controlled not to be higher than the target temperature.

[0092] In other embodiments, when the cooling demand of the vehicle-mounted terminal meets the battery cooling condition, the battery pack is cooled at a preset cooling power.

[0093] The battery cooling method provided by the embodiment of the present application has at least the following beneficial effects: obtaining the temperature control parameters of the battery pack, and determining the required cooling capacity of the battery pack according to the current temperature information and the temperature control parameters. Further, cooling management of the battery pack is performed 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 duration is determined, and cooling management of the battery pack is performed according to the cooling demand. In this way, when the battery pack requires cooling capacity to reach the target temperature, cooling is turned on in advance, and cooling management of the battery is performed in a timely manner, 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.

[0094] In one design, to improve the user experience. The above S301 includes: S3011.

[0095] S3011. Determine the temperature control parameters according to the state of charge SOC of the battery pack and the current cooling mode of the battery pack.

[0096] As a possible implementation manner, when the state of charge of the battery pack is greater than or equal to the first power threshold, the determined temperature control parameters include 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.

[0097] In some embodiments, the vehicle-mounted 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 the first power threshold. Further, when the state of charge of the battery pack is greater than or equal to the first power threshold, the determined temperature control parameters include 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 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.

[0098] Further, when the current cooling mode is the first cooling mode, the second temperature control parameters are determined. The second temperature control parameters include 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 parameters are determined. The temperature control parameters include the third target duration and the 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.

[0099] In some embodiments, the first cooling mode and the second cooling mode are pre-configured. The embodiments of the present application do not make specific limitations on the naming of the first cooling mode and the second cooling mode. For example, the second cooling mode may be a high dynamic 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 current cooling mode of the battery pack will be adjusted to the first cooling mode.

[0100] 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.

[0101] 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.

[0102] It should be noted that the first power threshold, the first target temperature, the second target temperature, the third target temperature, the fourth target temperature, the first target duration, the second target duration, and the third target duration in the embodiments of the present application are pre-configured in the vehicle terminal, and the embodiments of the present application do not make specific limitations on their data.

[0103] It can be understood that the target temperature and the 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 small, the temperature approaching line reached by the battery pack is increased to reduce the cooling energy consumption.

[0104] In one design, in order to accurately determine the refrigeration demand, the current temperature information includes the current actual temperature of the battery pack and the ambient temperature where the battery pack is located. The above S302 includes: S3021 - S3022.

[0105] S3021. Obtain the heat generation power of the battery pack.

[0106] In the embodiments of the present application, the heat generation power of the battery pack may be the heat generation power of the battery pack, or may also be the heat generation power of a single battery cell in the battery pack.

[0107] In some embodiments, the vehicle terminal obtains the heat generation power of the target single battery cell in the battery pack, and determines the total heat generation power of the battery pack according to the heat generation power of the target single battery cell in the battery pack and the number of single battery cells.

[0108] Specifically, the vehicle terminal determines the heat generation power according to the single cell voltage, open circuit voltage, and discharge current of the single battery in the battery pack.

[0109] For example, the vehicle-mounted terminal inputs the single-cell voltage, open-circuit voltage, and discharge current into the heat value formula to obtain the heat generation power of the single cell.

[0110] Exemplarily, the heat value formula is as shown in Formula 1 below.

[0111] Formula 1.

[0112] Wherein, is the heat generation power, is the single-cell voltage, is the open-circuit voltage, is the discharge current.

[0113] It should be noted that the single-cell voltage is the voltage of the single cell during discharge, the open-circuit voltage is the voltage of the single cell when not discharging (or the rated voltage of the single cell), and the open-circuit current is the discharge current of the battery pack.

[0114] In some other embodiments, when the vehicle-mounted terminal determines the heat generation power of the single cell , the heat generation power of the single cell is filtered to obtain the filtered heat generation power.

[0115] Exemplarily, the heat generation power of the single cell is input into the filtering formula to obtain the filtered heat generation power. The filtering formula is as shown in Formula 2 below.

[0116] Formula 2.

[0117] Wherein, is the (n + 1)th filtered heat generation power, α is the filtering coefficient, is the (n + 1)th observed heat generation power, is the nth predicted heat generation power.

[0118] Exemplarily, as Figure 4 shown, Figure 4 is a schematic diagram of the heat generation amount and filtering effect of the single cell of a single battery shown according to an exemplary embodiment. In Figure 4 , it is shown that during the discharge process of the battery pack, the fluctuation of the heat generation amount of the single cell is very high. Thus, by filtering the heat generation power, an adaptive cooling strategy is made for the working condition of unstable heat generation during driving.

[0119] In some embodiments, the single-cell voltage may be the single-cell voltage of the single cell with the highest temperature in the battery pack. In some other embodiments, in order to avoid local voltage outliers, the single-cell voltage is the average voltage of multiple single-cell voltages in the battery pack. The embodiments of the present application do not make specific limitations on the value of the single-cell voltage.

[0120] S3022. Determine the refrigeration demand according to the heating power, the current actual temperature, the ambient temperature, and the control parameters.

[0121] As a possible implementation, the vehicle-mounted terminal determines the adjusted heat and the heat exchange amount of the electronic group according to the current actual temperature, the ambient temperature, and the control parameters, and determines the refrigeration demand according to the total heating power, the adjusted heat value, and the heat exchange amount of the battery pack. Among them, the adjusted heat value is the heat absorbed or dissipated when the electronic group is adjusted from the current actual temperature to the target temperature, and the heat exchange amount is the heat exchanged between the battery pack and the environment where the battery pack is located.

[0122] In this way, the refrigeration demand is determined according to the adjusted heat value, the heat exchange value, and the heating value of the battery pack. This refrigeration demand represents the relationship between the heat dissipation and the heat generation of the battery pack. Considering the environmental heat dissipation and the adjustment ability of the battery pack comprehensively makes the obtained refrigeration demand more accurate. Thus, it is possible to simply and effectively determine whether it is necessary to cool the discharging battery.

[0123] As a possible implementation, the refrigeration demand includes the total refrigeration demand power, and the battery pack includes multiple battery cells. The vehicle-mounted terminal determines the refrigeration demand power of each battery cell among 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 determines the total refrigeration demand power according to the refrigeration demand power of the multiple battery cells.

[0124] In some embodiments, the adjusted 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 adjusted power is the heat release power or the heat absorption power. The heat exchange power between the battery pack and the environment is determined according to the preset environment exchange coefficient, the ambient temperature, and the current actual temperature. The refrigeration demand power of the battery cell is determined according to the adjusted power, the heat exchange power, and the heating power of the battery cell.

[0125] In other embodiments, 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 are input into the refrigeration demand power to obtain the refrigeration demand power of the battery cell.

[0126] As a possible implementation, the vehicle-mounted 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 refrigeration demand power formula to obtain the total refrigeration demand power.

[0127] Exemplarily, the total refrigeration demand power formula is as shown in Formula Three below.

[0128] Formula Three.

[0129] Among them, is the total power of the refrigeration demand, is the specific heat capacity of the battery cells in the battery pack, is the target temperature, is the current actual temperature, is the target duration, is the filtered heat generation power, is the ambient temperature, is the ambient exchange coefficient, is the number of single cells in the battery pack.

[0130] Based on the above technical means, the refrigeration demand is determined according to the current actual temperature, the ambient temperature, and the temperature control parameters. In this way, the ambient heat dissipation is comprehensively considered, and it has strong adaptability to complex environmental factors. Furthermore, the battery pack can be accurately cooled and managed, and the battery can be better protected.

[0131] It can be understood that the refrigeration demand is determined according to the adjusted heat value, the heat exchange value, and the heat generation value of the battery pack. This refrigeration demand represents the relationship between the heat dissipation and the heat generation of the battery pack. By comprehensively considering the ambient heat dissipation and the adjustment ability of the battery pack, the obtained refrigeration demand is more accurate. Thus, it can be simply and effectively determined whether it is necessary to cool the battery in the discharging state.

[0132] In one design, in order to accurately perform thermal management on the battery pack, the battery pack is provided with a cooling system. The above S303 includes: S3031.

[0133] S3031. When the refrigeration demand is greater than or equal to a preset threshold, according to the current actual temperature, the control parameters, and the ambient temperature of the environment where the battery pack is located, adjust the temperature of the cooling medium in the cooling system, and the adjusted temperature is less than the target temperature.

[0134] As a possible implementation manner, the vehicle-mounted terminal determines whether the refrigeration demand is greater than or equal to a preset threshold. When the refrigeration demand is greater than or equal to the preset threshold, according to the current actual temperature, the control parameters, and the ambient temperature of the environment where the battery pack is located, adjust the temperature of the cooling medium in the cooling system. When the refrigeration demand is less than the preset threshold, do not cool the battery pack.

[0135] In some embodiments, when the refrigeration demand is greater than or equal to a preset threshold, the vehicle-mounted terminal starts the cooling system of the battery pack, and according to the current actual temperature, the temperature control parameters, and the ambient temperature, obtains the outlet target temperature of the cooling medium at the outlet of the battery pack. Further, the vehicle-mounted terminal controls the temperature of the cooling medium flowing out of the battery pack outlet to be the outlet target temperature.

[0136] Exemplarily, the outlet target temperature satisfies the following formula four.

[0137] Formula Four.

[0138] Among them, is the outlet target temperature, is the specific heat capacity of the battery cells in the battery pack, is the target temperature, is the current actual temperature, is the target duration, is the filtered heat generation power, is the ambient temperature, is the ambient exchange coefficient, is the medium exchange coefficient between the battery and the cooling medium.

[0139] In some embodiments, in the embodiments of the present application, when the battery cooling condition is satisfied, calculate the temperature or refrigeration power of the cooling medium for the current cooling demand: According to Fourier's law, the rate of heat transfer from the battery to the environment is proportional to the temperature difference.

[0140] Exemplarily, as Figure 5 shown, Figure 5 is a schematic diagram of battery heat exchange shown according to an exemplary embodiment. In Figure 5 the heat transfer between the battery cells is ignored.

[0141] In 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: . Among them, 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.

[0142] In Figure 5 the ambient temperature is . The heat exchange formula between the single battery and the environment can be the second heat exchange formula: . Among them, 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.

[0143] In Figure 5In the shown schematic diagram of battery heat exchange, the thermal management control strategy for the entire battery pack is mapped by calculating the temperature change of a single battery cell. Since the control objective is to keep the maximum battery temperature from exceeding the target temperature, it is only necessary to calculate the battery cell with the highest temperature. Thus, according to the first heat exchange formula and the second heat exchange formula, the ambient heat transfer formula is shown as Formula Five below.

[0144] Formula Five.

[0145] Among them, is the battery temperature change rate, is the specific heat capacity of the battery cells in the battery pack, is the temperature of the cooling medium, is the current actual temperature, is the filtered heat generation power, is the ambient temperature, is the ambient heat exchange coefficient, is the medium exchange coefficient between the battery and the cooling medium.

[0146] It should be noted that , can be calculated using the structural parameters of the battery pack or identified based on the test data of the battery pack.

[0147] Furthermore, since the ambient heat transfer formula can characterize the instantaneous state change of the battery pack, and the temperature of the cooling battery does not exceed the target temperature T1 within the target time period t1, the demand at the current moment (T1 - T) / t1 = dT / dt can be expressed. Substituting it into the ambient heat transfer formula, the outlet temperature determination formula can be obtained.

[0148] In some other embodiments, when the in-vehicle terminal determines the outlet target temperature of the cooling medium, considering the temperature difference between the inlet and outlet 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 temperature difference between the inlet and outlet of the cooling medium and the specific heat capacity of the cooling medium are proportional to the refrigeration power and also proportional to the temperature difference between the cooling medium and the battery. Thus, it can be obtained that: the temperature difference T2 between the inlet and outlet of the cooling medium = A3(T - Tw1). Among them, A3 is the temperature difference ratio coefficient between the temperature difference between the inlet and outlet and the temperature difference between the cooling medium and the battery. The temperature difference ratio coefficient is a coefficient pre-configured in the in-vehicle terminal.

[0149] Furthermore, the in-vehicle terminal obtains the inlet temperature of the cooling medium based on 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.

[0150] In some other embodiments, the vehicle-mounted terminal obtains the current actual temperature of the battery pack, the temperature control parameters, and the ambient temperature of the environment where the battery pack is located, and obtains the inlet target temperature of the cooling medium at the inlet of the battery pack. Further, the vehicle-mounted terminal configures the temperature of the cooling medium at the inlet of the battery pack as the inlet target temperature.

[0151] Exemplarily, the inlet target temperature of the cooling medium satisfies the following formula six.

[0152] Formula six.

[0153] Wherein, is the inlet target temperature, is the specific heat capacity of the battery cells of the battery pack, is the target temperature, is the current actual temperature, is the target duration, is the filtered heat generation power, is the ambient temperature, is the ambient exchange coefficient, is the medium exchange coefficient between the battery and the cooling medium, is the temperature difference proportionality coefficient.

[0154] In some embodiments, when the outlet target temperature is greater than the temperature upper limit threshold, the outlet target temperature is adjusted, and the adjusted outlet target temperature controls the outlet temperature of the cooling medium in the battery pack. For example, the temperature upper limit threshold is set as the outlet target temperature.

[0155] 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 in the battery pack. For example, the temperature lower limit threshold is set as the outlet target temperature.

[0156] In the embodiments of the present application, through the cooling management of the battery pack, the temperature of the battery pack after the cooling target duration is controlled below the target temperature. Among them, if the highest temperature of the current battery pack is higher than the target temperature, the temperature of the battery pack will be reduced below the target temperature after the target duration. If the current battery temperature is lower than the target temperature, the temperature of the battery pack will be protected from rising above the target temperature after the target duration.

[0157] In some embodiments, to better understand the battery cooling method provided by the embodiments of the present application, Figure 6 is a schematic diagram of the battery discharge current under a test condition shown according to an exemplary embodiment. In Figure 6 shows a schematic diagram of the change of the discharge current within the target duration. Combining Figure 6 , Figure 7It is a schematic diagram of battery cooling during battery discharge under a test condition shown according to an exemplary embodiment. In Figure 7 it shows 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. Among them, Figure 7 the data shown is the controller area network (CAN) signal data collected when the battery management system software cools the battery in combination with the battery cooling method in the embodiment of the present application.

[0158] In addition, in Figure 7 the target temperature controlled is comprehensively considered in combination with factors such as the service life and discharge capacity of the battery. Figure 7 The target temperature shown in it = 44 °C, and this target temperature can meet the battery pack life quality assurance and is the temperature value with the maximum allowable discharge power.

[0159] Since the shorter the control target duration is set, the more drastic the response of the target cooling medium to the battery temperature is when the temperature approaches the target temperature. If the target duration is set too long, it is difficult to achieve the expected cooling effect in a short time. Based on the test situation of the actual vehicle, in Figure 7 it shows the target duration = 6000 s.

[0160] Combined with Figure 7 it can be seen that the cooling system controls the battery inlet temperature and the control target temperature follows well. The maximum temperature of the battery is also controlled around the target. A lower target water temperature is sent in the interval with high heat generation in the early stage, and a higher target water temperature is sent when the heat generation is low in the later stage. In this way, the battery cooling method provided by 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.

[0161] To better understand the battery cooling method provided by the embodiment of the present application, as Figure 8 shown, Figure 8 it is a schematic diagram of a battery cooling process shown according to an exemplary embodiment, including: S801 - S808.

[0162] S801. Determine the temperature control parameters according to the current discharge performance mode and the remaining battery power.

[0163] Among them, the temperature control parameters include the target temperature and the target duration.

[0164] For details of this step, see the above S301, which will not be elaborated here.

[0165] S802. Determine whether the battery pack is in a dischargeable state and the charging gun is not connected.

[0166] If so, execute S803. If not, end.

[0167] S803. Calculate the heat generation power of a single battery cell.

[0168] In some embodiments, the vehicle-mounted terminal calculates the heat generation power of a single battery cell in real time or periodically.

[0169] For details of this step, refer to S3021 above and will not be elaborated here.

[0170] S804. Filter the heat generation power to obtain the filtered heat generation power.

[0171] For details of this step, refer to S3021 above and will not be elaborated here.

[0172] S805. Determine the refrigeration demand value according to the filtered heat generation power.

[0173] For details of this step, refer to S302 above and will not be elaborated here.

[0174] S806. Determine whether the refrigeration demand value is greater than a preset threshold.

[0175] If so, execute S807. If not, end.

[0176] S807. Perform cooling management on the battery pack.

[0177] For details of this step, refer to S303 and S3031 above and will not be elaborated here.

[0178] S808. End.

[0179] The battery cooling method provided by the embodiments of the present application has at least the following beneficial effects: 1) It can simply and effectively determine whether it is necessary to cool the battery in the discharging state. 2) It has strong adaptability to complex environmental factors. It can accurately evaluate the working conditions where the heat generation of the battery is low and cooling is not required, and request an appropriate cooling capacity from the thermal management system during cooling to save energy consumption; for scenarios where the battery discharging power is high and the environmental temperature is high, cooling can be started in advance to better protect the battery from overheating. 3) There is no need to conduct a large number of repeated experiments to verify fixed temperature thresholds, saving R & D costs.

[0180] The above mainly introduces the solution provided by the embodiments of the present application from the perspective of methods. To implement the above functions, a communication device includes corresponding hardware structures and / or software modules for performing each function. Those skilled in the art should easily realize that, combining 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 certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0181] Figure 9 is a schematic structural diagram of a battery cooling device shown according to an exemplary embodiment. Referring to Figure 9 , the battery cooling device 90 includes: an acquisition unit 901, a determination unit 902, and a processing unit 903.

[0182] The acquisition unit 901 is configured to acquire the temperature control parameter of the battery pack. 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 duration. The determination unit 902 is configured to determine the refrigeration demand of the battery pack according to the current temperature information of the battery pack and the temperature control parameter. The processing unit 903 is configured to perform cooling management on the battery pack according to the refrigeration demand.

[0183] In a possible way, the current temperature information includes the current actual temperature of the battery pack and the ambient temperature where the battery pack is located. The determination unit 902 is configured to: acquire the heat generation power of the battery pack. Determine the refrigeration demand according to the heat generation power, the current actual temperature, the ambient temperature, and the control parameter.

[0184] In a possible way, the refrigeration demand includes the total refrigeration demand power, and the battery pack includes multiple battery cells. The determination unit 902 is configured to: for each battery cell among the multiple battery cells, determine the refrigeration demand power of the battery cell according to 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 parameter. Determine the total refrigeration demand power according to the refrigeration demand powers of the multiple battery cells.

[0185] In a possible way, the determination unit 902 is configured to: determine 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 heat release power or the heat absorption power. Determine the heat exchange power between the battery pack and the environment according to the preset environment exchange coefficient, the ambient temperature, and the current actual temperature. Determine the refrigeration demand power of the battery cell according to the adjustment power, the heat exchange power, and the heat generation power of the battery cell.

[0186] In one possible way, the determining unit 902 is further configured to determine a temperature control parameter according to the state of charge (SOC) of the battery pack and the current cooling mode of the battery pack.

[0187] In one possible way, the determining unit 902 is configured to: when the state of charge (SOC) of the battery pack is greater than or equal to a first power threshold, determine that the temperature control parameter includes 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, determine the temperature control parameter according to the current cooling mode of the battery pack.

[0188] In one possible way, when the state of charge (SOC) of the battery pack is less than the first power threshold, the determining unit 902 is configured to: when the state of charge (SOC) of the battery pack is less than the first power threshold and the current cooling mode is a first cooling mode, determine a second temperature control parameter. The second temperature control parameter is used to indicate that the temperature of the battery pack is controlled not to exceed a second target temperature within a second target duration. It includes the second target duration and the 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 state of charge (SOC) of the battery pack is less than the first power threshold and the current cooling mode is a second cooling mode, determine the temperature control parameter. 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.

[0189] In one possible way, the determining unit 902 is configured to: when the battery pack is in a dischargeable state and the battery pack is not connected to a charging device, 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.

[0190] In one possible way, the battery pack is provided with a cooling system. The processing unit 903 is specifically configured to: when the refrigeration 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, the control parameter, and the ambient temperature of the environment where the battery pack is located, and the adjusted temperature is less than the target temperature.

[0191] Figure 10 It is a schematic structural diagram of a vehicle-mounted terminal shown according to an exemplary embodiment. As Figure 10 shown, the vehicle-mounted terminal includes, but is not limited to: a processor 1001 and a memory 1002.

[0192] Wherein, the above-mentioned memory 1002 is used to store the executable instructions of the above-mentioned processor 1001. It can be understood that the above-mentioned processor 1001 is configured to execute instructions to implement the battery cooling method in the above-mentioned embodiments.

[0193] The processor 1001 is the control center of the vehicle-mounted terminal, connecting various parts of the entire vehicle-mounted terminal through various interfaces and lines. By running or executing software programs and / or modules stored in the memory 1002, and by calling the data stored in the memory 1002, it executes various functions of the vehicle-mounted terminal and processes data, thereby monitoring the vehicle-mounted 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. Among them, the application processor mainly processes the operating system, user interface, application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor may not be integrated into the processor 1001 either.

[0194] The memory 1002 can be used to store software programs and various data. The memory 1002 mainly includes a program storage area and a data storage area. Among them, the program storage area can store the operating system, application programs required by at least one functional module (such as a determination unit, a processing unit, etc.). In addition, the memory 1002 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0195] In an exemplary embodiment, there is also provided a computer-readable storage medium including instructions, such as the memory 1002 including instructions. The above instructions can be executed by the processor 1001 of the vehicle-mounted terminal to implement the method in the above embodiment.

[0196] Optionally, the computer-readable storage medium may be a non-transitory computer-readable storage medium. For example, the non-transitory 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, and an optical data storage device, etc.

[0197] In an exemplary embodiment, the embodiment of the present application also provides a computer program product including one or more instructions. The one or more instructions can be executed by the processor 1001 of the vehicle-mounted terminal to complete the method in the above embodiment.

[0198] It should be noted that when the instructions in the above computer-readable storage medium or the one or more instructions in the computer program product are executed by the processor of the vehicle-mounted terminal, they implement each process of the above method embodiment and can achieve the same technical effect as the above method. To avoid repetition, it will not be elaborated here.

[0199] From the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above functional modules is used as an example. In actual applications, the above functions can be allocated 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.

[0200] In the several embodiments provided in the present application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, 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 displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in electrical, mechanical or other forms.

[0201] The units described as separate components may or may not be physically separated. The components displayed as units may be one physical unit or multiple physical units, that is, they can be located in one place or distributed to multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0202] In addition, each functional unit in the various embodiments of the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0203] 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 embodiments of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. The software product is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods in the various embodiments of the present application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, ROM, RAM, magnetic disks or optical disks and other various media that can store program codes.

[0204] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery cooling method, characterized in that, The method includes: obtaining temperature control parameters of a battery pack; the temperature control parameters are used to indicate that the temperature of the battery pack is controlled not to exceed a target temperature within a target duration; 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 greater than or equal to a first power threshold, or include a second target duration and a second target temperature when the SOC of the battery pack is less than the first power threshold and the current cooling mode is a first cooling mode; wherein, the first target duration is greater than the second target duration, and the first target temperature is greater than the second target temperature; if the current cooling mode is a second cooling mode, 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. Determine the refrigeration demand of the battery pack according to the current temperature information of the battery pack and the temperature control parameters. When the refrigeration demand is greater than or equal to a preset threshold, adjust the temperature of the cooling medium in the cooling system of the battery pack according to the current actual temperature, the temperature control parameters, and the ambient temperature of the environment where the battery pack is located, and the adjusted temperature is less than the target temperature.

2. The battery cooling method according to claim 1, wherein The current temperature information includes the current actual temperature of the battery pack and the ambient temperature of the environment where the battery pack is located; determining the refrigeration demand of the battery pack according to the current temperature information of the battery pack and the temperature control parameters includes: Obtain the heat generation power of the battery pack. Determine the refrigeration demand according to the heat generation power, the current actual temperature, the ambient temperature, and the temperature control parameters.

3. The battery cooling method according to claim 2, characterized in that, The refrigeration demand includes the total refrigeration demand power, and the battery pack includes multiple battery cells; determining the refrigeration demand according to the heat generation power, the current actual temperature, the ambient temperature, and the temperature control parameters includes: For each of the multiple battery cells, determine the refrigeration demand power of the battery cell according to 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 temperature control parameters. Determine the total refrigeration demand power according to the refrigeration demand powers of the multiple battery cells.

4. The battery cooling method according to claim 3, wherein Determining the refrigeration demand power of the battery cell according to 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 temperature control parameters includes: Determine 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 heat release power or the heat absorption power. Determine the heat exchange power between the battery pack and the environment according to a preset environment exchange coefficient, the ambient temperature, and the current actual temperature. Determine the refrigeration demand power of the battery cell according to the adjustment power, the heat exchange power, and the heat generation power of the battery cell.

5. The battery cooling method according to claim 1, wherein 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, including: When the battery pack is in a dischargeable state and not connected to a charging device, 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.

6. A battery cooling device, characterized in that, The device includes: an acquisition unit, a determination unit, and a processing unit; the acquisition unit is configured to acquire the temperature control parameter of the battery pack; 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 duration; when the state of charge (SOC) of the battery pack is greater than or equal to the first power threshold, the temperature control parameter includes a first target duration and a first target temperature, or when the state of charge (SOC) of the battery pack is less than the first power threshold, if the current cooling mode is the first cooling mode, it 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; if the current cooling mode is the second cooling mode, it 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; The determination unit is further configured to determine the refrigeration demand of the battery pack according to the current temperature information of the battery pack and the temperature control parameter; The processing unit is configured to, when the refrigeration demand is greater than or equal to a preset threshold, according to the current actual temperature, control The parameter, the ambient temperature of the environment where the battery pack is located, adjusts the temperature of the cooling medium in the cooling system of the battery pack, and the adjusted temperature is less than the target temperature.

7. A vehicle-mounted terminal, characterized in that, Includes a memory and a processor; The memory and the processor are coupled; The memory is used to store computer program code, and the computer program code includes computer instructions; When the processor executes the computer instructions, the vehicle-mounted terminal executes the battery cooling method according to any one of claims 1-5.

8. A vehicle, characterized in that, Includes the vehicle-mounted terminal according to claim 7.

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