Thermal management control method and device for power battery

Abstract

The application relates to the technical field of new energy vehicles, in particular to a thermal management control method and device for a power battery, wherein the method comprises the following steps: when a vehicle is in a preset high-temperature charging condition, current SOC and current temperature of the power battery of the vehicle are acquired, charging information of a charging device is acquired, it is judged whether the vehicle will satisfy a preset over-temperature condition in a charging process, if the preset over-temperature condition is satisfied, an optimal cooling strategy of the power battery is matched, and the highest temperature of the power battery is controlled to be lower than a highest temperature index under the optimal cooling strategy. According to the application, the thermal management control of the power battery can be realized based on the charging pile capacity, the battery system temperature, the initial SOC and the charging information of the charging device, so that the highest temperature in the charging process can be effectively controlled under the high-temperature condition, the battery is prevented from being damaged, the energy consumption in the charging process is reduced, the charging time is shortened, and the use experience of the user is improved.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle technology, and in particular to a thermal management control method and device for power batteries. Background Technology

[0002] As the new energy vehicle market continues to expand, the requirements for power batteries are also increasing. The power batteries used in new energy vehicles are mainly NCM, NCA, and LiFePO4. All three types of power batteries exhibit capacity degradation and long charging times under normal / high temperature charging conditions.

[0003] In related technologies, the current battery thermal management control strategy during normal high-temperature charging adopts a constant cooling threshold. When the temperature reaches the cooling threshold and cooling is activated, a constant inlet water temperature and flow rate are used to cool the battery.

[0004] However, in related technologies, such as patent CN113386631A "Power Battery Thermal Management Method, Vehicle Controller, Hydrogen Energy Vehicle and Storage Medium", the battery thermal management control strategy cannot effectively control the highest temperature of the battery system during charging, causing the battery system capacity to decay rapidly and resulting in battery loss. Furthermore, it does not consider the external conditions during the charging process and the optimal time to start cooling, leading to increased energy consumption and reduced charging efficiency of the power battery, which cannot meet the user's needs and urgently needs to be solved. Summary of the Invention

[0005] This application provides a thermal management control method and apparatus for a power battery to solve the problems in related technologies, such as the inability of battery thermal management control strategies to effectively control the highest temperature of the battery system during charging, causing rapid capacity decay of the battery system and battery loss, and the failure to consider external conditions during charging and the optimal timing for starting cooling, resulting in increased energy consumption, reduced charging efficiency of the power battery, and inability to meet user needs.

[0006] The first aspect of this application provides a thermal management control method for a power battery, comprising the following steps: when the vehicle is in a preset constant high temperature charging condition, acquiring the current SOC (State of Charge) value and current temperature of the vehicle's power battery, and simultaneously acquiring charging information of the charging device; determining whether the vehicle will meet a preset over-temperature condition during charging based on the current SOC value, the current temperature, and the charging information; if the preset over-temperature condition will be met, matching the optimal cooling strategy for the power battery, so as to control the maximum temperature of the power battery to be less than the maximum temperature index under the optimal cooling strategy.

[0007] Based on the above-mentioned technical means, the embodiments of this application can realize thermal management control of the power battery based on the charging pile capacity, battery system temperature, initial SOC and charging equipment charging information, thereby ensuring that the maximum charging temperature is effectively controlled under normal high temperature conditions to avoid battery damage, while reducing energy consumption during the charging process, shortening charging time and improving the user experience.

[0008] In one embodiment of this application, determining whether the vehicle will meet a preset over-temperature condition during charging based on the current SOC value, the current temperature, and the charging information includes: generating a first charging current curve based on the current SOC value, the current temperature, the charging information, and a charging strategy MAP; calculating the highest temperature that the power battery can reach without cooling based on the first charging current curve; and comparing the highest temperature of the power battery with the highest temperature index to determine whether to activate cooling based on the comparison result.

[0009] Based on the above technical means, this application embodiment generates a first charging current curve based on the current SOC value, current temperature, charging information and charging strategy MAP, calculates the highest temperature that the power battery can reach without cooling based on the first charging current curve, compares the highest temperature of the power battery with the highest temperature index, and determines whether to turn on cooling based on the comparison result, thereby ensuring the safety of battery charging at high temperature and maintaining the normal charging process of the battery.

[0010] In one embodiment of this application, the optimal cooling strategy for matching the power battery includes: generating a second charging current curve based on the current SOC value, the current temperature, the charging information, the charging strategy MAP, and the cooling power of the power battery; and using the second charging current curve to calculate the cooling activation threshold determined by the power battery based on the highest temperature index and the current temperature, thereby generating the optimal cooling strategy.

[0011] Based on the above technical means, the embodiments of this application can generate a second charging current curve based on the current SOC value, current temperature, charging information, charging strategy MAP diagram and cooling power of the power battery, and use the second charging current curve to calculate the cooling start threshold of the power battery based on the highest temperature index and the current temperature, generate the optimal cooling strategy, thereby obtaining the optimal time to start cooling, while controlling the highest temperature of the battery system to meet the requirements, reducing the energy consumed in the cooling process, and thus improving charging efficiency.

[0012] Optionally, in one embodiment of this application, the method further includes: detecting whether the vehicle meets a preset cooling end condition; and when the preset cooling end condition is detected, controlling the vehicle to exit the cooling mode and stopping the cooling of the power battery.

[0013] Based on the above technical means, the embodiments of this application can detect whether the vehicle meets the preset cooling end conditions, and when the preset cooling end conditions are detected, control the vehicle to exit the cooling mode and stop cooling the power battery, thereby effectively controlling the total time consumed in the battery cooling process, further reducing other energy losses in the charging process, so as to ensure the charging efficiency and charging safety of the battery.

[0014] Optionally, in one embodiment of this application, the preset cooling termination condition includes the power battery ending charging, the highest temperature of the power battery being less than or equal to a preset cooling shutdown threshold, and the current cell voltage being equal to the maximum cell voltage.

[0015] According to the above technical means, in one embodiment of this application, the preset cooling end conditions include the power battery ending charging, the power battery's highest temperature being less than or equal to the preset cooling shut-off threshold, and the cell's current voltage being equal to the cell's maximum voltage value. By limiting the cooling shut-off conditions, the safety of the vehicle during the charging and cooling process is improved, and the user experience is further enhanced.

[0016] A second aspect of this application provides a thermal management control device for a power battery, comprising: an acquisition module, configured to acquire the current SOC value and current temperature of the power battery of the vehicle while acquiring charging information of the charging device when the vehicle is in a preset constant high temperature charging condition; a judgment module, configured to determine whether the vehicle will meet a preset over-temperature condition during charging based on the current SOC value, the current temperature and the charging information; and a control module, configured to match the optimal cooling strategy for the power battery if the preset over-temperature condition will be met, so as to control the maximum temperature of the power battery to be less than the maximum temperature index under the optimal cooling strategy.

[0017] In one embodiment of this application, the determination module includes: a first generation unit, configured to generate a first charging current curve based on the current SOC value, the current temperature, the charging information, and the charging strategy MAP; a first calculation unit, configured to calculate the highest temperature that the power battery can reach without cooling based on the first charging current curve; and a confirmation unit, configured to compare the highest temperature of the power battery with the highest temperature index to determine whether to activate cooling based on the comparison result.

[0018] In one embodiment of this application, the control module includes: a second generation unit, configured to generate a second charging current curve based on the current SOC value, the current temperature, the charging information, the charging strategy MAP, and the cooling power of the power battery; and a second calculation unit, configured to use the second charging current curve to calculate the cooling activation threshold determined by the power battery based on the highest temperature index and the current temperature, and generate the optimal cooling strategy.

[0019] Optionally, in one embodiment of this application, the device further includes a detection module for detecting whether the vehicle meets a preset cooling end condition; and a stop module for controlling the vehicle to exit the cooling mode and stop cooling the power battery when the preset cooling end condition is detected.

[0020] Optionally, in one embodiment of this application, the preset cooling termination condition includes the power battery ending charging, the highest temperature of the power battery being less than or equal to a preset cooling shutdown threshold, and the current cell voltage being equal to the maximum cell voltage.

[0021] A third aspect of this application provides a vehicle, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the thermal management control method for a power battery as described in the above embodiments.

[0022] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described thermal management control method for a power battery.

[0023] The beneficial effects of this application are:

[0024] (1) The embodiments of this application can realize thermal management control of the power battery based on the charging pile capacity, battery system temperature, initial SOC and charging equipment charging information, thereby ensuring that the maximum charging temperature is effectively controlled under normal high temperature conditions to avoid battery damage, while reducing energy consumption during charging, shortening charging time and improving user experience.

[0025] (2) In this embodiment of the application, a first charging current curve is generated based on the current SOC value, current temperature, charging information and charging strategy MAP. The highest temperature that the power battery can reach without cooling is calculated based on the first charging current curve. The highest temperature of the power battery and the highest temperature index are compared to determine whether to turn on the cooling based on the comparison results, thereby ensuring the safety of the battery charging at high temperature and maintaining the normal charging process of the battery.

[0026] (3) The embodiments of this application can generate a second charging current curve based on the current SOC value, current temperature, charging information, charging strategy MAP and cooling power of the power battery, and use the second charging current curve to calculate the cooling start threshold of the power battery based on the highest temperature index and the current temperature, generate the best cooling strategy, thereby obtaining the best time to start cooling, while controlling the highest temperature of the battery system to meet the requirements, reducing the energy consumed in the cooling process, and thus improving the charging efficiency.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 This is a flowchart of a thermal management control method for a power battery according to an embodiment of this application;

[0030] Figure 2 This is a logical diagram illustrating the process of determining whether to activate cooling according to one embodiment of this application.

[0031] Figure 3 This is a logical diagram illustrating the process of determining the cooling start time according to an embodiment of this application;

[0032] Figure 4 This is a logical diagram illustrating the process of determining whether to shut down cooling according to one embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the structure of a power battery thermal management control device according to an embodiment of this application;

[0034] Figure 6 This is a structural schematic diagram of a vehicle according to an embodiment of this application.

[0035] Among them, 10-power battery thermal management control device; 100-acquisition module, 200-judgment module and 300-control module; 601-memory, 602-processor and 603-communication interface. Detailed Implementation

[0036] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0037] The following describes a thermal management control method and apparatus for a power battery according to embodiments of this application, with reference to the accompanying drawings. Addressing the issues raised in the background section regarding the ineffective control of battery thermal management control strategies during charging, which lead to rapid capacity decay and battery damage, and fail to consider external conditions and optimal timing for cooling activation during charging, resulting in increased energy consumption, reduced charging efficiency, and failure to meet user needs, this application provides a thermal management control method for a power battery. This method acquires the current SOC value and temperature of the vehicle's power battery while simultaneously obtaining charging information from the charging equipment when the vehicle is in a preset constant-temperature charging condition. It then determines whether the vehicle will meet a preset over-temperature condition during charging. If the preset over-temperature condition is met, the optimal cooling strategy for the power battery is matched to control the maximum temperature of the power battery below the maximum temperature index under the optimal cooling strategy. This ensures effective control of the maximum charging temperature under constant-temperature conditions, preventing battery damage, reducing energy consumption during charging, shortening charging time, and improving the user experience. This solves the problems in related technologies, such as the inability of battery thermal management control strategies to effectively control the highest temperature of the battery system during charging, which leads to rapid capacity decay and battery loss. Furthermore, the failure to consider external conditions during charging and the optimal timing for activating cooling results in increased energy consumption, reduced charging efficiency of the power battery, and inability to meet user needs.

[0038] Specifically, Figure 1 This is a schematic flowchart illustrating a thermal management control method for a power battery provided in an embodiment of this application.

[0039] like Figure 1 As shown, the thermal management control method for this power battery includes the following steps:

[0040] In step S101, when the vehicle is in a preset constant high temperature charging condition, the current SOC value and current temperature of the vehicle's power battery are obtained, and the charging information of the charging equipment is also obtained.

[0041] It is understood that the preset constant temperature charging condition in the embodiments of this application can be the ambient temperature of the battery at normal or high temperature, the current temperature can be the current temperature value of the battery, and the charging information of the charging device can be the charging capacity of the charging device connected to the battery, such as obtaining the charging capacity of the connected charging pile.

[0042] It should be noted that the preset constant high temperature charging conditions are set by those skilled in the art based on actual conditions, and are not specifically limited here.

[0043] In some embodiments, the remaining SOC value of the power battery can be calculated, the current temperature value can be obtained through the temperature sensor inside the new energy vehicle, and the charging information of the corresponding charging device can be obtained from the cloud via network connection.

[0044] This application embodiment can acquire the current SOC value and current temperature of the vehicle's power battery while the vehicle is in a preset constant high temperature charging condition, and simultaneously acquire the charging information of the charging equipment. By collecting and analyzing relevant information about the charging environment in which the battery is located, and combining it with the actual external conditions, the excess energy consumption of the battery is further reduced, making it more practical.

[0045] In step S102, it is determined whether the vehicle will meet the preset over-temperature condition during the charging process based on the current SOC value, current temperature and charging information.

[0046] It is understood that the preset over-temperature condition in this application embodiment can be determined by processing the current SOC value, current temperature and charging information to determine whether the temperature of the power battery exceeds the specified maximum temperature during the charging process, so as to decide whether to activate the battery cooling function at the current temperature.

[0047] It should be noted that the preset over-temperature conditions are set by those skilled in the art based on actual conditions, and no specific limitations are made here.

[0048] The embodiments of this application can determine whether the vehicle will meet the preset over-temperature conditions during the charging process based on the current SOC value, current temperature and charging information, and thus determine whether cooling needs to be activated under this condition to avoid the capacity degradation of the battery system caused by high temperature and to ensure the charging safety of the battery.

[0049] In one embodiment of this application, determining whether the vehicle will meet the preset over-temperature condition during charging based on the current SOC value, current temperature, and charging information includes: generating a first charging current curve based on the current SOC value, current temperature, charging information, and charging strategy MAP; calculating the highest temperature that the power battery can reach without cooling based on the first charging current curve; and comparing the highest temperature of the power battery with the highest temperature index to determine whether to activate cooling based on the comparison result.

[0050] It is understood that the first charging current curve generated in this embodiment can be based on the current SOC value, current temperature, charging information, and charging strategy MAP diagram, assuming the battery temperature T0 remains constant, and using a first-order RC equivalent circuit model to output the charging current curve from the current SOC to 100% SOC. The maximum temperature index can be the highest temperature threshold that the power battery can reach.

[0051] In actual operation, the highest temperature T1 that the power battery can reach without cooling can be calculated from the obtained first charging current curve. This temperature is then compared with the maximum temperature requirement Tmax of the battery system. If T1 < Tmax, charging continues. When the battery system temperature reaches T0+1℃, the above process is repeated until T1 ≥ Tmax, which satisfies the preset over-temperature condition. Then, it is determined that the power battery needs to turn on cooling during this charging process at the corresponding T1 temperature.

[0052] For example, such as Figure 2 The diagram shown is a logical schematic of the cooling activation determination process according to an embodiment of this application. First, the equivalent circuit model in the software is input with the charging pile capacity, the current SOC of the battery system, the charging strategy, the cell parameters, and the current temperature T0 of the battery system to obtain the corresponding thermal model. That is, the highest temperature T1 reached by the battery system without cooling is calculated based on the charging curve. Based on the obtained highest temperature T1, the relationship between T1 and the highest temperature index Tmax of the power battery is determined. If T1 < Tmax, charging continues. The above logic is repeated for re-determination every time the actual system temperature rises by 1°C. If T1 ≥ Tmax, an instruction is output that cooling needs to be activated.

[0053] This application embodiment generates a first charging current curve based on the current SOC value, current temperature, charging information, and charging strategy MAP. Based on the first charging current curve, it calculates the highest temperature that the power battery can reach without cooling. It compares the highest temperature of the power battery with the highest temperature index to determine whether to activate cooling based on the comparison results, thereby ensuring the safety of battery charging at high temperatures and maintaining the normal charging process of the battery.

[0054] In step S103, if the preset over-temperature condition is met, the optimal cooling strategy for the power battery is matched to control the maximum temperature of the power battery to be lower than the maximum temperature index under the optimal cooling strategy.

[0055] It is understood that the optimal cooling strategy in this application embodiment can be the current battery temperature at which battery cooling is activated, so that when the power battery thermal management cooling measures are activated at this temperature, the highest temperature of the power battery during charging and cooling is lower than the highest temperature index.

[0056] In this application embodiment, when the preset over-temperature condition is met, the optimal cooling strategy for the power battery is matched so that the maximum temperature of the power battery is controlled to be lower than the maximum temperature index under the optimal cooling strategy, thereby reducing the energy consumption used for cooling the battery and further reducing the charging time of the power battery.

[0057] In one embodiment of this application, matching the optimal cooling strategy for the power battery includes: generating a second charging current curve based on the current SOC value, current temperature, charging information, charging strategy MAP, and cooling power of the power battery; and using the second charging current curve to calculate the cooling activation threshold of the power battery based on the highest temperature index and the current temperature, thereby generating the optimal cooling strategy.

[0058] It is understood that, in the embodiments of this application, the second charging current curve can be based on the current SOC value, current temperature, charging information, charging strategy MAP diagram, and cooling power of the power battery, with the battery temperature T0 set constant, and the charging current curve when the current SOC reaches 100% SOC is output using a first-order RC equivalent circuit model. The cooling activation threshold can be the battery temperature at which cooling begins.

[0059] In actual execution, the obtained second charging current curve can be used to calculate the corresponding value of the highest temperature T1 that the power battery can reach when cooling is activated at the corresponding times Tmax-1, Tmax-2...T0, until T1≤Tmax, at which point Tcool0 is output as the cooling activation threshold. When the battery system temperature changes to T0+1℃ during charging, the calculation process is repeated until the cooling activation threshold Tcool is output, and cooling is activated according to the cooling activation threshold.

[0060] For example, such as Figure 3 The diagram shown illustrates the logic of the cooling activation timing determination process according to an embodiment of this application. First, based on the charging pile capability, the current SOC of the battery system, the charging strategy, cell parameters, the current T0 of the battery system, and the equivalent circuit model in the cooling power input software, a corresponding thermal model is obtained. Specifically, based on the charging curve, when cooling is activated at temperature points Tmax-1, Tmax-2, ..., T1, the highest battery system temperature Tmax1 is calculated and determined. If cooling is activated at Tmax-1 but cannot maintain the highest battery system temperature Tmax, then Tmax-2 is executed, and this process is repeated to find the cooling activation temperature Tcool0. This continues until cooling is activated at Tcool0, which can maintain the highest battery system temperature Tmax. At this point, the activation cooling temperature Tcool is output. Furthermore, for every 1°C increase in the actual battery system temperature, a new thermal model is recalculated.

[0061] The embodiments of this application can generate a second charging current curve based on the current SOC value, current temperature, charging information, charging strategy MAP, and cooling power of the power battery. The second charging current curve is used to calculate the cooling start threshold of the power battery based on the highest temperature index and the current temperature, thereby generating the optimal cooling strategy and obtaining the optimal time to start cooling. While controlling the highest temperature of the battery system to meet the requirements, the energy consumed in the cooling process is reduced, thereby improving charging efficiency.

[0062] Optionally, in one embodiment of this application, the method further includes: detecting whether the vehicle meets a preset cooling end condition; and when the preset cooling end condition is detected, controlling the vehicle to exit the cooling mode and stopping the cooling of the power battery.

[0063] It is understood that the preset cooling end condition in the embodiments of this application can be a condition set based on the overall vehicle performance requirements to make the battery reach the cooling end state, so as to end the cooling mode of the power battery of the new energy vehicle and stop cooling the battery.

[0064] It should be noted that the preset cooling end conditions are set by those skilled in the art according to the actual situation, and are not specifically limited here.

[0065] This application embodiment can detect whether the vehicle meets the preset cooling end condition, and when the preset cooling end condition is detected, control the vehicle to exit the cooling mode and stop cooling the power battery, thereby effectively controlling the total time consumed in the battery cooling process and further reducing other energy losses in the charging process, so as to ensure the charging efficiency and charging safety of the battery.

[0066] Optionally, in one embodiment of this application, the preset cooling termination conditions include the power battery ending charging, the power battery's highest temperature being less than or equal to a preset cooling shutdown threshold, and the cell's current voltage being equal to the cell's maximum voltage value.

[0067] It is understood that, in the embodiments of this application, the battery cooling is determined to be finished and cooling is exited when the vehicle meets any one of the following conditions: the power battery has finished charging, the highest temperature of the power battery is less than or equal to the preset cooling shutdown threshold, and the current cell voltage is equal to the maximum cell voltage. The preset cooling shutdown threshold can be the current temperature at which the battery reaches the cooling shutdown condition.

[0068] It should be noted that the preset cooling shutdown threshold is set by those skilled in the art based on actual conditions, and is not specifically limited here.

[0069] For example, such as Figure 4 The diagram shown illustrates the logic of the cooling shutdown determination process according to an embodiment of this application. Cooling of the power battery is shut off when the battery system finishes charging, or the highest battery system temperature is less than or equal to a preset cooling shutdown threshold T2, or the current cell voltage Ucell reaches the maximum cell voltage Umax.

[0070] In one embodiment of this application, the preset cooling termination conditions include the power battery ending charging, the power battery's highest temperature being less than or equal to a preset cooling shutdown threshold, and the cell's current voltage being equal to the cell's maximum voltage value. By limiting the cooling shutdown conditions, the safety of the vehicle during the charging and cooling process is improved, further enhancing the user experience.

[0071] The thermal management control method for power batteries proposed in this application can, when the vehicle is in a preset constant high-temperature charging condition, acquire the current SOC value and current temperature of the vehicle's power battery, and simultaneously acquire charging information from the charging equipment. It then determines whether the vehicle will meet a preset over-temperature condition during charging. If the preset over-temperature condition is met, the optimal cooling strategy for the power battery is matched to control the maximum temperature of the power battery to be lower than the maximum temperature index under the optimal cooling strategy. This ensures effective control of the maximum charging temperature under constant high-temperature conditions, preventing battery damage, reducing energy consumption during charging, shortening charging time, and improving the user experience. Therefore, this solves the problems in related technologies where battery thermal management control strategies cannot effectively control the maximum temperature of the battery system during charging, causing rapid capacity decay and battery loss. Furthermore, these strategies do not consider external conditions during charging and the optimal timing for activating cooling, leading to increased energy consumption, reduced charging efficiency, and failure to meet user needs.

[0072] Next, the thermal management control device for a power battery according to an embodiment of this application is described with reference to the accompanying drawings.

[0073] Figure 5 This is a block diagram of the thermal management control device for a power battery according to an embodiment of this application.

[0074] like Figure 5 As shown, the thermal management control device 10 for the power battery includes: an acquisition module 100, a judgment module 200, and a control module 300.

[0075] The acquisition module 100 is used to acquire the current SOC value and current temperature of the vehicle's power battery while acquiring the charging information of the charging equipment when the vehicle is in a preset constant high temperature charging condition.

[0076] The judgment module 200 is used to determine whether the vehicle will meet the preset over-temperature conditions during the charging process based on the current SOC value, current temperature and charging information.

[0077] The control module 300 is used to match the optimal cooling strategy for the power battery if the preset over-temperature conditions are met, so as to control the maximum temperature of the power battery to be lower than the maximum temperature index under the optimal cooling strategy.

[0078] In one embodiment of this application, the judgment module 200 includes: a first generation unit, a first calculation unit, and a confirmation unit.

[0079] The first generation unit is used to generate a first charging current curve based on the current SOC value, current temperature, charging information and charging strategy MAP.

[0080] The first calculation unit is used to calculate the highest temperature that the power battery can reach without turning on the cooling based on the first charging current curve.

[0081] The confirmation unit is used to compare the highest temperature and maximum temperature index of the power battery to determine whether to activate cooling based on the comparison results.

[0082] In one embodiment of this application, the control module 300 includes: a second generation unit and a second calculation unit.

[0083] The second generation unit is used to generate a second charging current curve based on the current SOC value, current temperature, charging information, charging strategy MAP, and cooling power of the power battery.

[0084] The second calculation unit is used to calculate the cooling activation threshold of the power battery based on the highest temperature index and the current temperature using the second charging current curve, and to generate the optimal cooling strategy.

[0085] Optionally, in one embodiment of this application, the device 10 further includes a detection module and a stop module.

[0086] The detection module is used to detect whether the vehicle meets the preset cooling end conditions.

[0087] The stop module is used to control the vehicle to exit the cooling mode and stop cooling the power battery when the preset cooling end condition is detected.

[0088] Optionally, in one embodiment of this application, the preset cooling termination conditions include the power battery ending charging, the power battery's highest temperature being less than or equal to a preset cooling shutdown threshold, and the cell's current voltage being equal to the cell's maximum voltage value.

[0089] It should be noted that the foregoing explanation of the embodiment of the thermal management control method for power batteries also applies to the thermal management control device of the power battery in this embodiment, and will not be repeated here.

[0090] The thermal management control device for a power battery proposed in this application can, when the vehicle is in a preset constant high-temperature charging condition, acquire the current SOC value and current temperature of the vehicle's power battery, and simultaneously acquire charging information from the charging equipment. It then determines whether the vehicle will meet a preset over-temperature condition during charging. If the preset over-temperature condition is met, the optimal cooling strategy for the power battery is matched to control the maximum temperature of the power battery to be lower than the maximum temperature index under the optimal cooling strategy. This ensures effective control of the maximum charging temperature under constant high-temperature conditions, preventing battery damage, reducing energy consumption during charging, shortening charging time, and improving the user experience. Therefore, this solves the problems in related technologies where the battery thermal management control strategy cannot effectively control the maximum temperature of the battery system during charging, causing rapid capacity decay and battery loss. Furthermore, it fails to consider external conditions during charging and the optimal timing for cooling activation, leading to increased energy consumption, reduced charging efficiency, and failure to meet user needs.

[0091] Figure 6 A schematic diagram of the structure of a vehicle provided in an embodiment of this application. The vehicle may include:

[0092] The memory 601, the processor 602, and the computer program stored on the memory 601 and capable of running on the processor 602.

[0093] When the processor 602 executes the program, it implements the thermal management control method for the power battery provided in the above embodiments.

[0094] Furthermore, the vehicle also includes:

[0095] Communication interface 603 is used for communication between memory 601 and processor 602.

[0096] The memory 601 is used to store computer programs that can run on the processor 602.

[0097] The memory 601 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0098] If the memory 601, processor 602, and communication interface 603 are implemented independently, then the communication interface 603, memory 601, and processor 602 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0099] Alternatively, in a specific implementation, if the memory 601, processor 602, and communication interface 603 are integrated on a single chip, then the memory 601, processor 602, and communication interface 603 can communicate with each other through an internal interface.

[0100] The processor 602 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0101] This embodiment also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described thermal management control method for a power battery.

[0102] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0103] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0104] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0105] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0106] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0107] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0108] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0109] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A thermal management control method for a power battery, characterized in that, Includes the following steps: When the vehicle is in a preset constant high temperature charging condition, the current SOC value and current temperature of the vehicle's power battery are obtained, and the charging information of the charging equipment is also obtained. Based on the current SOC value, the current temperature, and the charging information, it is determined whether the vehicle will meet the preset over-temperature conditions during the charging process; as well as If the preset over-temperature condition is met, then the optimal cooling strategy for the power battery is matched to control the maximum temperature of the power battery to be less than the maximum temperature index under the optimal cooling strategy. Also includes: Detect whether the vehicle meets the preset cooling end conditions; When the preset cooling end condition is detected, the vehicle is controlled to exit the cooling mode and the cooling of the power battery is stopped. The preset cooling termination conditions include the power battery ending charging, the power battery's highest temperature being less than or equal to the preset cooling shutdown threshold, and the cell's current voltage being equal to the cell's maximum voltage value. The step of determining whether the vehicle will meet the preset over-temperature condition during charging based on the current SOC value, the current temperature, and the charging information includes: A first charging current curve is generated based on the current SOC value, the current temperature, the charging information, and the charging strategy MAP. The highest temperature that the power battery can reach without cooling is calculated based on the first charging current curve. The highest temperature of the power battery is compared with the highest temperature index, and the cooling system is activated based on the comparison results. The optimal cooling strategy for the power battery includes: A second charging current curve is generated based on the current SOC value, the current temperature, the charging information, the charging strategy MAP, and the cooling power of the power battery. The second charging current curve is used to calculate the cooling activation threshold of the power battery based on the highest temperature index and the current temperature, and the optimal cooling strategy is generated. Calculating the cooling activation threshold of the power battery based on the highest temperature index and the current temperature using the second charging current curve includes: The second charging current curve is used to calculate the corresponding value of the highest temperature T1 that the power battery can reach when the cooling is turned on at the corresponding times Tmax-1, Tmax-2...T0, until T1≤Tmax, then the output Tcool0 is the cooling start threshold.

2. A thermal management control device for a power battery, implementing the thermal management control method for a power battery as described in any one of claims 1, characterized in that, include: The acquisition module is used to acquire the current SOC value and current temperature of the vehicle's power battery while acquiring the charging information of the charging equipment when the vehicle is under a preset constant high temperature charging condition. The judgment module is used to determine whether the vehicle will meet the preset over-temperature condition during the charging process based on the current SOC value, the current temperature and the charging information; as well as The control module is used to match the optimal cooling strategy of the power battery if the preset over-temperature condition is met, so as to control the maximum temperature of the power battery to be less than the maximum temperature index under the optimal cooling strategy.

3. The apparatus according to claim 2, characterized in that, The judgment module includes: The first generation unit is used to generate a first charging current curve based on the current SOC value, the current temperature, the charging information, and the charging strategy MAP. The first calculation unit is used to calculate the highest temperature that the power battery can reach when cooling is not turned on, based on the first charging current curve. The confirmation unit is used to compare the highest temperature of the power battery with the highest temperature index, and to determine whether to activate cooling based on the comparison result.

4. The apparatus according to claim 3, characterized in that, The control module includes: The second generation unit is used to generate a second charging current curve based on the current SOC value, the current temperature, the charging information, the charging strategy MAP, and the cooling power of the power battery. The second calculation unit is used to calculate the cooling activation threshold determined by the power battery based on the highest temperature index and the current temperature using the second charging current curve, and to generate the optimal cooling strategy.

5. A vehicle, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the thermal management control method for a power battery as described in any one of claims 1.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the thermal management control method for the power battery as described in any one of claims 1.

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