Control method and device of power battery cooling system, electronic equipment, storage medium, computer program product and vehicle

Abstract

The application provides a control method and device of a power battery cooling system, electronic equipment, a storage medium, a computer program product and a vehicle. The control method of the power battery cooling system comprises: acquiring a working parameter of a power battery; determining a state of the power battery based on the working parameter of the power battery; dynamically adjusting a control parameter of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameter of the cooling system, so that the state of the cooling system matches the state of the power battery. The application can match the state of the cooling system with the state of the power battery based on the control parameter, thereby overcoming the poor adaptability of the existing cooling system.

Description

Technical Field

[0001] This application relates to the field of cooling control, and more specifically, to a control method, apparatus, electronic device, storage medium, computer program product, and vehicle for a power battery cooling system. Background Technology

[0002] Currently, traditional cooling systems are often "passive" or "open-loop" controlled, resulting in poor adaptability and an inability to meet the needs of different operating conditions. For example, when a vehicle is traveling at a constant speed in urban areas (e.g., 30-50 km / h) and the power battery is in a low-load cruising state (stable and low output power, minimal heat generation), the electric pump in a traditional passive cooling system still operates at a fixed high speed (e.g., 1800 rpm), and the fan maintains a constant airflow. At this time, the circulation flow rate of the cooling medium far exceeds the battery's heat dissipation requirements, and the continuous high-power operation of the electric pump and fan will consume additional power battery energy. Summary of the Invention

[0003] The purpose of this application is to provide a control method, device, electronic device, storage medium, computer program product, and vehicle for a power battery cooling system, so as to dynamically adjust the state of the cooling system according to the state of the power battery and adapt to the vehicle usage needs in different scenarios.

[0004] In a first aspect, the present invention provides a control method for a power battery cooling system, the method comprising: Obtain the operating parameters of the power battery; The state of the power battery is determined based on its operating parameters. The control parameters of the cooling system are dynamically adjusted based on the state of the power battery, and the cooling system is controlled based on the control parameters of the cooling system so that the state of the cooling system matches the state of the power battery.

[0005] The method of this application can determine the state of the power battery through the working parameters of the power battery, and then dynamically adjust the control parameters of the cooling system according to the state of the power battery. Based on the control parameters, the state of the cooling system is matched with the state of the power battery, thereby overcoming the defect of poor adaptability of the existing cooling system.

[0006] In an optional implementation, the operating parameters of the power battery include the voltage and current of the power battery, and the control parameters of the cooling system include the rotational speed of the electronic pump of the cooling system. And, determining the state of the power battery based on its operating parameters includes: The output power of the power battery is determined based on the voltage and current of the power battery. When the output power of the power battery is within the low load power range and the output power of the power battery remains stable within the determination period, the state of the power battery is the low load cruise state. And, the step of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, includes: When the power battery is in the low-load cruise state, the speed of the electronic pump is adjusted to the first electronic pump target speed, so that the cooling system is in a low-power state based on the first electronic pump target speed.

[0007] This optional implementation can reduce the speed of the electric pump when the power battery is in a low-load cruising state, thereby reducing the power consumption of the cooling system and improving the overall vehicle range.

[0008] In an optional implementation, the operating parameters of the power battery also include the internal resistance of the power battery, and the control parameters of the cooling system also include the proportional valve opening degree, the outlet temperature of the cooler, the opening degree of the electronic expansion valve, and the compressor speed. Furthermore, determining the state of the power battery based on its operating parameters further includes: Predict whether the power battery has a risk of thermal runaway based on the internal resistance or voltage of the power battery. When the power battery is at risk of thermal runaway, the state of the power battery is determined to be a runaway risk state; Furthermore, the method of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, further includes: When the power battery is in the state of runaway risk, the outlet temperature of the cooler is adjusted to the target temperature, the opening of the electronic expansion valve is adjusted to the target opening of the electronic expansion valve, the speed of the compressor is the target speed of the compressor, the opening of the proportional valve is the target opening of the proportional valve, and the speed of the electronic pump is the target speed of the second electronic pump, so that the cooling system is in a high cooling power operation state.

[0009] This optional implementation can control the opening degree of the proportional valve, the outlet temperature of the cooler, the opening degree of the electronic expansion valve, and the speed of the compressor when the power battery is in a state of runaway risk, so as to keep the cooling system in a high cooling power operation state, thereby improving the cooling effect and preventing thermal runaway of the power battery.

[0010] In an optional embodiment, the target temperature is 5-8°C, the target opening degree of the electronic expansion valve is 100%, the target speed of the compressor is the maximum speed of the compressor, the target opening degree of the proportional valve is 100%, and the target speed of the second electronic pump is 4000-5000 rpm.

[0011] This optional implementation sets the target temperature to 5-8°C, the target opening of the electronic expansion valve to 100%, the target speed of the compressor to the maximum speed of the compressor, the target opening of the proportional valve to 100%, and the target speed of the second electronic pump to 4000-5000 rpm. This enables the cooling system to achieve a cooling rate of more than 3 degrees / min within 30 seconds, thereby maximizing the utilization of the cooling capacity of the cooling system and avoiding redundant cooling capacity.

[0012] In an optional embodiment, the operating parameters of the power battery also include the temperature of several regions of the power battery, and the proportional valve opening includes the proportional valve opening of each cooling circuit of the cooling system. And, determining the state of the power battery based on its operating parameters includes: The uniformity of the temperature distribution of the power battery is determined based on the temperature of several regions of the power battery. When the temperature distribution of the power battery is uneven, the power battery is in a state of localized high temperature. Furthermore, the method of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, further includes: When the power battery is in the state of local high temperature, the opening degree of the proportional valve of each cooling circuit is independently adjusted based on the temperature of each region of the power battery, so that the cooling system is in a gradient temperature control state.

[0013] This optional implementation can independently control the opening of the proportional valve flowing through each region based on the temperature of each region when the power battery is in a state of uneven temperature. This allows the proportional valve opening to be set according to the temperature of each region, thereby achieving temperature uniformity and avoiding excessive temperature differences between each region.

[0014] In an optional implementation, determining whether the temperature distribution of the power battery is uniform based on the temperature of several regions of the power battery includes: The average temperature and the maximum temperature are determined based on the temperature of several regions of the power battery. If the difference between the maximum temperature and the average temperature is greater than or equal to 3°C, then the temperature distribution of the power battery is determined to be uneven.

[0015] This optional implementation determines whether the temperature distribution of the power battery is uneven based on the average temperature and the maximum temperature.

[0016] In an optional implementation, the control parameters of the cooling system further include the opening degree of the cooling valve and the heater bypass start signal; Furthermore, determining the state of the power battery based on its operating parameters further includes: The minimum temperature is determined based on the temperature of several regions of the power battery. When the minimum temperature is less than zero degrees Celsius, the power battery is in a low-temperature start-up state. Furthermore, the method of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, further includes: When the power battery is in the low-temperature start-up state, the heater is started based on the heater bypass start-up signal, and the opening of the cooling valve is reduced or adjusted to zero so that the cooling system is in a rapid heating state.

[0017] This optional implementation can control the cooling system to be in a rapid heating state when the power battery is in the low-temperature start-up state. By reducing the opening of the cooling valve or adjusting the opening of the cooling valve to zero, the cooling effect is reduced simultaneously, thereby rapidly heating the power battery in the low-temperature state and ensuring the performance of the power battery.

[0018] In a second aspect, the present invention provides a control device for a power battery cooling system, the device comprising: The acquisition module is used to acquire the operating parameters of the power battery; The determination module is used to determine the state of the power battery based on the operating parameters of the power battery; The dynamic control module is used to dynamically adjust the control parameters of the cooling system based on the state of the power battery, and to control the cooling system based on the control parameters of the cooling system so that the state of the cooling system matches the state of the power battery.

[0019] The device of this application can determine the state of the power battery through the working parameters of the power battery, and then dynamically adjust the control parameters of the cooling system according to the state of the power battery. Based on the control parameters, the state of the cooling system is matched with the state of the power battery, thereby overcoming the defect of poor adaptability of the existing cooling system.

[0020] Thirdly, the present invention provides an electronic device, comprising: Processor; and The memory is configured to store machine-readable instructions that, when executed by the processor, perform the method as described in any of the foregoing embodiments.

[0021] The electronic device of this application, by executing the control method of the power battery cooling system, can determine the state of the power battery based on the working parameters of the power battery, and then dynamically adjust the control parameters of the cooling system according to the state of the power battery, so as to match the state of the cooling system with the state of the power battery based on the control parameters, thereby overcoming the defect of poor adaptability of the existing cooling system.

[0022] Fourthly, the present invention provides a storage medium storing a computer program, the computer program being executed by a processor as described in any of the foregoing embodiments.

[0023] The storage medium of this application, by executing the control method of the power battery cooling system, can determine the state of the power battery based on the working parameters of the power battery, and then dynamically adjust the control parameters of the cooling system according to the state of the power battery, so as to match the state of the cooling system with the state of the power battery based on the control parameters, thereby overcoming the defect of poor adaptability of the existing cooling system.

[0024] Fifthly, the present invention provides a computer program product comprising a computer program that, when executed by a processor, implements the method described in any of the foregoing embodiments.

[0025] The computer program product of this application, by executing the control method of the power battery cooling system, can determine the state of the power battery based on the working parameters of the power battery, and then dynamically adjust the control parameters of the cooling system according to the state of the power battery, so as to match the state of the cooling system with the state of the power battery based on the control parameters, thereby overcoming the defect of poor adaptability of the existing cooling system.

[0026] In a sixth aspect, the present invention provides a vehicle that includes electronic equipment as described in the foregoing embodiments.

[0027] The vehicle described in this application can determine the state of the power battery based on the working parameters of the power battery, and then dynamically adjust the control parameters of the cooling system according to the state of the power battery. Based on these control parameters, the state of the cooling system is matched with the state of the power battery, thereby overcoming the defect of poor adaptability of existing cooling systems. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic flowchart of a control method for a power battery cooling system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a control device for a power battery cooling system provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0031] Please see Figure 1 , Figure 1 This is a schematic flowchart illustrating a control method for a power battery cooling system provided in an embodiment of this application. Figure 1 As shown, the method in this application embodiment includes the following steps: 101. Obtain the operating parameters of the power battery; 102. Determine the state of the power battery based on its operating parameters; 103. The control parameters of the cooling system are dynamically adjusted based on the state of the power battery, and the cooling system is controlled based on the control parameters of the cooling system so that the state of the cooling system matches the state of the power battery.

[0032] In the embodiments of this application, the operating parameters of the power battery refer to quantitative indicators that can reflect the real-time operating status, performance characteristics and health status of the power battery. These parameters can include categories such as electrical parameters, thermal parameters and chemical characteristic parameters. Among them, electrical parameters can be current and voltage, and thermal parameters can be temperature, etc.

[0033] In this embodiment, the state of the power battery refers to a comprehensive state determined based on the battery's operating parameters (such as voltage, current, power, temperature, internal resistance, etc.), reflecting the battery's current operating mode, load level, thermal safety risks, and environmental adaptability. The power battery state can include load-related states, which are states determined based on electrical parameters such as output power and current, reflecting the battery's energy output intensity, such as low-load cruising state and high-load discharge state. The power battery state can also include thermal safety-related states, which are states determined based on parameters such as temperature and internal resistance, reflecting the battery's thermal safety risks and temperature distribution characteristics, such as runaway risk state, localized high-temperature state, and low-temperature start-up state. In this embodiment, the control parameters of the cooling system refer to the adjustable operating parameters of key components in the cooling system that directly affect cooling capacity and power consumption. Adjusting these parameters can change the heat dissipation intensity and operating mode of the cooling system, thereby adapting to the different state requirements of the power battery. These control parameters may include control parameters of the cooling system's power components, which are parameters of components that drive the circulation or heat exchange of the cooling medium, such as the speed of the electronic pump controlling the coolant flow, the speed of the cooling fan controlling the airflow, and the speed of the compressor controlling the power of the refrigeration system. The control parameters of the cooling system may also include cooling system flow / path control parameters, which are parameters of components that adjust the flow direction and flow distribution of the cooling medium, such as the opening degree of the proportional valve, the opening degree of the electronic expansion valve, and the opening degree of the cooling valve.

[0034] In this embodiment of the application, voltage, current and temperature data are collected in real time by voltage sensors installed at the positive and negative terminals of the power battery, current sensors in the main circuit and temperature sensors inside the battery pack, thereby obtaining the operating parameters of the power battery. The collection frequency is once every 0.5 seconds to ensure data timeliness.

[0035] In this embodiment of the application, the average value of the operating parameters within the most recent 10 seconds can be retrieved from the historical database of the power battery management system (BMS) to obtain the operating parameters of the power battery.

[0036] The method in this application embodiment can determine the state of the power battery through its operating parameters, and then dynamically adjust the control parameters of the cooling system according to the state of the power battery. This ensures that the state of the cooling system matches the state of the power battery, overcoming the poor adaptability of existing cooling systems. For example, traditional cooling systems use fixed parameters (e.g., a constant 1500 rpm for the electronic pump). When the power battery is under low load, overcooling leads to additional power consumption. With this method, the cooling system parameters are adapted under low load, significantly improving the vehicle's single-charge range and avoiding unnecessary energy waste. Furthermore, when the power battery is under high load (e.g., during high-speed acceleration), traditional cooling systems fail to dissipate heat, causing the battery temperature to rise continuously and leading to performance degradation (e.g., reduced discharge power). With this method, the cooling system state is matched to the high-load state, the battery temperature remains stable within a safe range, ensuring stable power output and no performance degradation.

[0037] In this application embodiment, as an optional implementation, the operating parameters of the power battery include the voltage and current of the power battery, and the control parameters of the cooling system include the rotational speed of the electronic pump of the cooling system. In addition, determining the state of the power battery based on its operating parameters includes the following sub-steps: The output power of the power battery is determined based on its voltage and current. When the output power of the power battery is within the low load power range and the output power of the power battery remains stable within the judgment period, the state of the power battery is the low load cruise state. Furthermore, the control parameters of the cooling system are dynamically adjusted based on the state of the power battery, and the cooling system is controlled based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, including the following sub-steps: When the power battery is in a low-load cruising state, the speed of the electric pump is adjusted to the first electric pump target speed, so that the cooling system is in a low-power state based on the first electric pump target speed.

[0038] In the above embodiments, the low-load cruise state refers to the operating state of the power battery when the output power calculated based on the voltage and current of the power battery is within a preset low-load power range, and this output power remains stable (without significant fluctuations) within a set judgment period. The low-load cruise state can include urban road low-load cruise state and highway low-load cruise state. The urban road low-load cruise state refers to the power battery output power being within a low-load range and stable within the judgment period, corresponding to a scenario where the vehicle is traveling at a constant speed (e.g., 30-50 km / h) on urban roads without frequent acceleration or deceleration, at which time the battery power demand is stable and low. The highway low-load cruise state refers to the power battery output power being within a low-load range and stable within the judgment period, corresponding to a scenario where the vehicle is traveling at a constant speed (e.g., 60-80 km / h) on a highway without rapid acceleration or hill climbing, and this state typically lasts longer than the urban road low-load cruise state.

[0039] In the above embodiments, the electronic pump speed of the cooling system refers to the rotational speed of the electronic pump that drives the cooling medium (such as coolant) to circulate in the cooling circuit. The electronic pump speed directly determines the circulation flow rate of the cooling medium; the higher the speed, the greater the coolant flow rate.

[0040] In the above embodiment, the first electronic pump target speed refers to the target operating speed of the electronic pump set to keep the cooling system in a low-power state when the power battery is in a low-load cruising state. This speed is determined based on the low heat generation characteristics of the battery in the low-load cruising state.

[0041] This optional implementation can reduce the speed of the electric pump when the power battery is in a low-load cruising state, thus keeping the cooling system in a low-power state, saving power consumption of the cooling system, and thereby improving the vehicle's range. As an example, a conventional electric vehicle's cooling system electric pump is fixed at 1800 rpm, resulting in high power consumption during low-load cruising in urban areas (such as a constant speed of 30 km / h). Using this method, the electric pump speed is adjusted to 1000 rpm, significantly reducing power consumption per 100 kilometers, improving the vehicle's range, and reducing the frequency of charging for users.

[0042] In this embodiment of the application, as an optional implementation, the operating parameters of the power battery also include the internal resistance of the power battery, and the control parameters of the cooling system also include the opening degree of the proportional valve, the outlet temperature of the cooler, the opening degree of the electronic expansion valve, and the speed of the compressor. In addition, determining the state of the power battery based on its operating parameters also includes the following sub-steps: Predict the risk of thermal runaway of a power battery based on its internal resistance or voltage. When there is a risk of thermal runaway in the power battery, the state of the power battery is determined to be a runaway risk state; In addition, the system dynamically adjusts the control parameters of the cooling system based on the state of the power battery, and controls the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery. This also includes: When the power battery is in a state of runaway risk, the outlet temperature of the cooler is adjusted to the target temperature, the opening of the electronic expansion valve is adjusted to the target opening of the electronic expansion valve, the speed of the compressor is adjusted to the target speed of the compressor, the opening of the proportional valve is adjusted to the target opening of the proportional valve, and the speed of the electronic pump is adjusted to the target speed of the second electronic pump, so that the cooling system is in a high cooling power operation state.

[0043] In the above optional embodiments, the thermal runaway risk of a power battery refers to the potential risk state of thermal runaway predicted by a preset judgment logic based on the battery's internal resistance or voltage operating parameters. Thermal runaway is an extreme situation in which a power battery experiences a rapid increase in temperature, releases a large amount of heat, or even causes combustion and explosion due to uncontrolled internal chemical reactions. The "thermal runaway risk" is a warning state before this extreme situation occurs. Specifically, the thermal runaway risk of a power battery can be based on abnormal internal resistance, that is, the thermal runaway risk is determined by monitoring abnormal changes in the internal resistance of the power battery (such as a significant increase in internal resistance within a short period of time). The thermal runaway risk of a power battery can also be based on abnormal voltage, that is, the thermal runaway risk is determined by monitoring abnormal fluctuations in the terminal voltage of the power battery (such as a sudden drop in voltage without reason, or excessively large differences in the voltage difference between individual cells).

[0044] In the above optional embodiments, the thermal runaway risk state of the power battery refers to the specific operating state of the power battery when the risk of thermal runaway is predicted by the internal resistance or voltage parameters of the power battery.

[0045] In the above optional embodiments, the high cooling power operation state of the cooling system refers to the operation state in which the cooling system reaches its maximum or near maximum heat dissipation capacity by adjusting control parameters such as the opening degree of the proportional valve, the outlet temperature of the cooler, the opening degree of the electronic expansion valve, the compressor speed, and the electronic pump speed when the power battery is in a state of runaway risk.

[0046] This optional implementation can control the proportional valve opening, cooler outlet temperature, electronic expansion valve opening, and compressor speed when the power battery is in a runaway risk state, thereby keeping the cooling system in a high-power cooling state to improve cooling efficiency and prevent thermal runaway of the power battery. As an example, if a power battery experiences an abnormal increase in internal resistance during charging, and the traditional cooling system fails to adjust in time, the battery temperature continues to rise to near the thermal runaway threshold. Using this method, the cooling system quickly enters a high-power operating state, and the battery temperature drops to a safe range within a short time, preventing a thermal runaway accident.

[0047] In this embodiment of the application, as an optional implementation, the target temperature is 5-8℃, the target opening degree of the electronic expansion valve is 100%, the target speed of the compressor is the maximum speed of the compressor, the target opening degree of the proportional valve is 100%, and the target speed of the second electronic pump is 4000-5000 rpm.

[0048] This optional implementation sets the target temperature to 5-8°C, the target opening of the electronic expansion valve to 100%, the target speed of the compressor to the maximum speed of the compressor, the target opening of the proportional valve to 100%, and the target speed of the second electronic pump to 4000-5000 rpm. This enables the cooling system to achieve a cooling rate of more than 3 degrees / min within 30 seconds, thereby maximizing the utilization of the cooling capacity of the cooling system and avoiding redundant cooling capacity.

[0049] In this embodiment of the application, as an optional implementation, the operating parameters of the power battery also include the temperature of several regions of the power battery, and the proportional valve opening degree includes the proportional valve opening degree of each cooling circuit of the cooling system. In addition, determining the state of the power battery based on its operating parameters includes the following steps: Determine whether the temperature distribution of the power battery is uniform based on the temperature of several regions of the power battery. When the temperature distribution of the power battery is uneven, the power battery is in a state of localized high temperature. Furthermore, the method of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, also includes the following steps: When the power battery is in a locally high temperature state, the opening of the proportional valve of each cooling circuit is adjusted independently based on the temperature of each area of ​​the power battery to make the cooling system be in a gradient temperature control state.

[0050] In the above optional embodiments, the localized high-temperature state of the power battery refers to the operating state of the power battery when, by collecting temperature data from several areas of the power battery, it is determined that there are significant differences in the temperature distribution of different areas of the battery (the temperature of some areas is significantly higher than that of other areas). Specifically, the localized high-temperature state of the power battery can include a module-level localized high-temperature state, that is, using an independent module of the power battery as the temperature monitoring unit, determining that the temperature of one or more modules is significantly higher than that of other modules (e.g., temperature difference between modules ≥ 3℃), which is commonly seen in scenarios where the heat dissipation channels of the module are blocked or the consistency of individual cells within the module is poor. Simultaneously, the localized high-temperature state of the power battery can also include a cell-level localized high-temperature state, that is, using an individual cell of the power battery as the temperature monitoring unit, determining that the temperature of one or more cells is significantly higher than that of other cells within the same module (e.g., temperature difference between cells ≥ 2℃).

[0051] In the above optional implementation, the gradient temperature control state of the cooling system refers to the cooling system operating state in which, when the power battery is in a locally high temperature state, the opening degree of the proportional valve of each cooling circuit in the cooling system is independently adjusted so that different temperature areas obtain cooling intensities that match their needs (high cooling intensity in high temperature areas and low cooling intensity in low temperature areas), ultimately achieving a cooling system operating state in which the battery temperature distribution tends to be uniform. The core feature is that "the cooling intensity varies with the regional temperature difference gradient, rather than being uniformly controlled".

[0052] In the above optional implementation, the power battery can be divided into different levels (such as high temperature zone, medium temperature zone, and normal temperature zone) according to the temperature differences in each area, and different proportional valve opening ranges can be set for the cooling circuits corresponding to different level areas. For example, a gradient temperature control state with an opening of 80%-100% in the high temperature zone, 50%-70% in the medium temperature zone, and 30%-40% in the normal temperature zone.

[0053] In the above optional implementation, the gradient temperature control state can be dynamically followed. For example, the temperature change of each area can be monitored in real time, and the opening of the corresponding circuit can be dynamically adjusted according to the linear relationship of "area temperature - proportional valve opening" (e.g., the opening increases by 10% for every 1°C increase in temperature above the average value). This allows the cooling intensity to follow the gradient temperature control state in real time, which is suitable for scenarios with dynamic temperature fluctuations.

[0054] In the above optional embodiments, the opening degree of the cooling circuit proportional valve refers to the degree to which the proportional valve controlling the flow rate of the cooling medium (such as coolant) in each independent cooling circuit (corresponding to a specific area of ​​the power battery) in the cooling system is open. It is the core control parameter for achieving gradient temperature control. The larger the opening degree, the greater the flow rate of the cooling medium in the corresponding circuit.

[0055] This optional implementation can independently control the opening of the proportional valve flowing through each region when the power battery is in a state of uneven temperature. This allows for setting a proportional valve opening that matches the temperature of each region, thereby achieving temperature uniformity and preventing excessive temperature differences between regions. For example, during fast charging of a power battery pack, the central region has a significantly higher temperature than the edge regions due to its narrower heat dissipation channels. Traditional cooling systems with uniform control cause the central temperature to continue rising, affecting charging efficiency. After adopting this method, the opening of the proportional valve in the central region's cooling circuit is increased, causing the central temperature to drop rapidly. This results in a more uniform temperature distribution across the entire battery pack, and the charging efficiency returns to normal.

[0056] In this embodiment of the application, as an optional implementation, determining whether the temperature distribution of the power battery is uniform based on the temperature of several regions of the power battery includes the following steps: The average and maximum temperatures are determined based on the temperatures of several regions of the power battery. If the difference between the maximum temperature and the average temperature is greater than or equal to 3℃, then the temperature distribution of the power battery is determined to be uneven.

[0057] In the above optional implementation, the effective temperature data of all regions can be summed and divided by the number of regions to obtain the average temperature; the maximum value is selected from all effective data as the maximum temperature.

[0058] In the above optional implementation, the average temperature data of each region is first taken over 5 seconds to obtain the average temperature of each region, and then the overall average temperature of these regions and the maximum average temperature of the region are calculated.

[0059] In the above optional implementation, the difference between the maximum temperature and the average temperature can be calculated. If the difference is ≥3℃, it is immediately determined that the temperature distribution is uneven. If the difference is <3℃, monitoring is continued for 3 minutes. If the difference is <3℃ within 3 minutes, it is determined that the temperature distribution is uniform.

[0060] In the above optional implementation, if the difference in a single calculation is ≥3℃, the difference is calculated again after an interval of 10 seconds. If the second difference is still ≥2.8℃ (considering dynamic fluctuations), it is determined to be uneven, thus avoiding misjudgment caused by single data fluctuations.

[0061] This optional implementation determines whether the temperature distribution of the power battery is uneven based on the average temperature and the maximum temperature.

[0062] In this embodiment of the application, as an optional implementation, the control parameters of the cooling system also include the opening degree of the cooling valve and the heater bypass start signal; In addition, determining the state of the power battery based on its operating parameters also includes the following steps: The minimum temperature is determined based on the temperature of several regions of the power battery. When the minimum temperature is below zero degrees Celsius, the power battery is in a low-temperature start-up state. Furthermore, the method of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, also includes the following steps: When the power battery is in a low-temperature start-up state, the heater is started based on the heater bypass start signal, and the opening of the cooling valve is reduced or adjusted to zero so that the cooling system is in a rapid heating state.

[0063] In the above optional embodiments, the low-temperature start-up state of the power battery refers to the operating state of the power battery when, by collecting temperature data from several areas of the power battery, the minimum battery temperature is determined to be below zero degrees Celsius, resulting in decreased battery activity and limited charge and discharge performance, requiring heating intervention to meet normal start-up and operation requirements. The low-temperature start-up state of the power battery can be a dynamic low-temperature start-up state, that is, in a low-temperature environment (such as after a brief stop during winter driving), the minimum temperature of the power battery is still below 0°C, and the vehicle needs to be started again, requiring the battery to quickly restore its performance. At this time, the battery may have slight residual heat but has not yet reached its normal temperature.

[0064] In the above optional embodiments, the heater bypass start signal refers to the control signal issued by the control system (such as the power battery management system BMS) to trigger the start of the heater in the cooling system when the power battery is determined to be in a low-temperature start-up state. The heater bypass start signal can be a low-temperature threshold triggered heater bypass start signal, that is, when the minimum temperature of the power battery drops to a preset low-temperature threshold (such as -2℃), the system automatically generates and sends a heater start signal without manual intervention, suitable for automatic heating start-up in normal low-temperature scenarios.

[0065] In the above optional embodiments, the rapid heating state of the cooling system refers to the operating state in which, when the power battery is in a low-temperature start-up state, the cooling system stops its heat dissipation function and focuses on transferring heat to the battery by starting the heater and reducing or closing the cooling valve, thereby achieving a rapid recovery of the battery temperature.

[0066] In the above optional embodiments, the cooling valve opening degree refers to the degree to which the valve in the cooling system controls whether the cooling medium (such as coolant) enters the heat dissipation circuit (such as the radiator), and is a key parameter for adjusting the heat dissipation capacity of the cooling system. The larger the opening degree, the more cooling medium enters the heat dissipation circuit, and the stronger the heat dissipation capacity; when the opening degree decreases or closes, the heat dissipation capacity weakens or stops.

[0067] This optional implementation can control the cooling system to be in a rapid heating state when the power battery is in a low-temperature start-up state. By reducing the opening of the cooling valve or adjusting the opening of the cooling valve to zero, the cooling effect is reduced simultaneously, thereby rapidly heating the power battery in a low-temperature state and ensuring the performance of the power battery.

[0068] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a control device for a power battery cooling system provided in an embodiment of this application. Figure 2 As shown, the apparatus in this embodiment includes the following functional modules: Module 201 is used to acquire the operating parameters of the power battery; Module 202 is used to determine the state of the power battery based on the operating parameters of the power battery; The dynamic control module 203 is used to dynamically adjust the control parameters of the cooling system based on the state of the power battery, and to control the cooling system based on the control parameters of the cooling system so that the state of the cooling system matches the state of the power battery.

[0069] The device in this application embodiment can determine the state of the power battery through the working parameters of the power battery, and then dynamically adjust the control parameters of the cooling system according to the state of the power battery. Based on the control parameters, the state of the cooling system is matched with the state of the power battery, thereby overcoming the defect of poor adaptability of the existing cooling system.

[0070] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application. For example... Figure 3 As shown, the electronic device includes: Processor 301; and The memory 302 is configured to store machine-readable instructions that, when executed by the processor 301, perform the method as described in any of the foregoing embodiments.

[0071] The electronic device in this application embodiment can determine the state of the power battery based on the working parameters of the power battery by executing the control method of the power battery cooling system. Then, it can dynamically adjust the control parameters of the cooling system according to the state of the power battery, so as to match the state of the cooling system with the state of the power battery based on the control parameters, thereby overcoming the defect of poor adaptability of the existing cooling system.

[0072] This application also provides a storage medium storing a computer program, which is executed by a processor using the method described in any of the foregoing embodiments.

[0073] The storage medium of this application embodiment can determine the state of the power battery based on the working parameters of the power battery by executing the control method of the power battery cooling system. Then, it can dynamically adjust the control parameters of the cooling system according to the state of the power battery, so that the state of the cooling system matches the state of the power battery based on the control parameters, thereby overcoming the defect of poor adaptability of the existing cooling system.

[0074] This application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the method claimed in any of the foregoing embodiments.

[0075] The computer program product of this application embodiment, by executing the control method of the power battery cooling system, can determine the state of the power battery based on the working parameters of the power battery, and then dynamically adjust the control parameters of the cooling system according to the state of the power battery, so as to match the state of the cooling system with the state of the power battery based on the control parameters, thereby overcoming the defect of poor adaptability of the existing cooling system.

[0076] This application also provides a vehicle that includes electronic equipment as described in the foregoing embodiments.

[0077] The vehicle in this application embodiment can determine the state of the power battery based on the working parameters of the power battery, and then dynamically adjust the control parameters of the cooling system according to the state of the power battery, so as to match the state of the cooling system with the state of the power battery based on the control parameters, thereby overcoming the defect of poor adaptability of the existing cooling system.

[0078] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interface; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0079] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0080] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0081] It should be noted that if a function is implemented as a software module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0082] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0083] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A control method for a power battery cooling system, characterized in that, The method includes: Obtain the operating parameters of the power battery; The state of the power battery is determined based on its operating parameters. The control parameters of the cooling system are dynamically adjusted based on the state of the power battery, and the cooling system is controlled based on the control parameters of the cooling system so that the state of the cooling system matches the state of the power battery. The operating parameters of the power battery include the voltage and current of the power battery, and the control parameters of the cooling system include the rotational speed of the electronic pump of the cooling system. And, determining the state of the power battery based on its operating parameters includes: The output power of the power battery is determined based on the voltage and current of the power battery. When the output power of the power battery is within the low load power range and the output power of the power battery remains stable within the determination period, the state of the power battery is the low load cruise state. And, the step of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, includes: When the power battery is in the low-load cruise state, the speed of the electronic pump is adjusted to the first electronic pump target speed, so that the cooling system is in a low-power state based on the first electronic pump target speed. The operating parameters of the power battery also include the internal resistance of the power battery, and the control parameters of the cooling system also include the opening degree of the proportional valve, the outlet temperature of the cooler, the opening degree of the electronic expansion valve, and the speed of the compressor. Furthermore, determining the state of the power battery based on its operating parameters further includes: Predict whether the power battery has a risk of thermal runaway based on the internal resistance or voltage of the power battery. When the power battery is at risk of thermal runaway, the state of the power battery is determined to be a runaway risk state; Furthermore, the method of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, further includes: When the power battery is in the runaway risk state, the outlet temperature of the cooler is adjusted to the target temperature, the opening of the electronic expansion valve is adjusted to the target opening of the electronic expansion valve, the speed of the compressor is the target speed of the compressor, the opening of the proportional valve is the target opening of the proportional valve, and the speed of the electronic pump is the target speed of the second electronic pump, so that the cooling system is in a high cooling power operation state. The operating parameters of the power battery also include the temperature of several areas of the power battery, and the proportional valve opening includes the proportional valve opening of each cooling circuit of the cooling system. And, determining the state of the power battery based on its operating parameters includes: The uniformity of the temperature distribution of the power battery is determined based on the temperature of several regions of the power battery. When the temperature distribution of the power battery is uneven, the power battery is in a state of localized high temperature. Furthermore, the method of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, further includes: When the power battery is in the state of local high temperature, the opening degree of the proportional valve of each cooling circuit is independently adjusted based on the temperature of each region of the power battery, so that the cooling system is in a gradient temperature control state.

2. The method as described in claim 1, characterized in that, The target temperature is 5-8℃, the target opening degree of the electronic expansion valve is 100%, the target speed of the compressor is the maximum speed of the compressor, the target opening degree of the proportional valve is 100%, and the target speed of the second electronic pump is 4000-5000 rpm.

3. The method as described in claim 1, characterized in that, The step of determining whether the temperature distribution of the power battery is uniform based on the temperature of several regions of the power battery includes: The average temperature and the maximum temperature are determined based on the temperature of several regions of the power battery. If the difference between the maximum temperature and the average temperature is greater than or equal to 3°C, then the temperature distribution of the power battery is determined to be uneven.

4. The method as described in claim 3, characterized in that, The control parameters of the cooling system also include the opening degree of the cooling valve and the heater bypass start signal; Furthermore, determining the state of the power battery based on its operating parameters further includes: The minimum temperature is determined based on the temperature of several regions of the power battery. When the minimum temperature is less than zero degrees Celsius, the power battery is in a low-temperature start-up state. Furthermore, the method of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, further includes: When the power battery is in the low-temperature start-up state, the heater is started based on the heater bypass start-up signal, and the opening of the cooling valve is reduced or adjusted to zero so that the cooling system is in a rapid heating state.

5. A control device for a power battery cooling system, characterized in that, The device includes: The acquisition module is used to acquire the operating parameters of the power battery; The determination module is used to determine the state of the power battery based on the operating parameters of the power battery; The dynamic control module is used to dynamically adjust the control parameters of the cooling system based on the state of the power battery, and to control the cooling system based on the control parameters of the cooling system so that the state of the cooling system matches the state of the power battery. The operating parameters of the power battery include the voltage and current of the power battery, and the control parameters of the cooling system include the rotational speed of the electronic pump of the cooling system. And, determining the state of the power battery based on its operating parameters includes: The output power of the power battery is determined based on the voltage and current of the power battery. When the output power of the power battery is within the low load power range and the output power of the power battery remains stable within the determination period, the state of the power battery is the low load cruise state. And, the step of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, includes: When the power battery is in the low-load cruise state, the speed of the electronic pump is adjusted to the first electronic pump target speed, so that the cooling system is in a low-power state based on the first electronic pump target speed. The operating parameters of the power battery also include the internal resistance of the power battery, and the control parameters of the cooling system also include the opening degree of the proportional valve, the outlet temperature of the cooler, the opening degree of the electronic expansion valve, and the speed of the compressor. Furthermore, determining the state of the power battery based on its operating parameters further includes: Predict whether the power battery has a risk of thermal runaway based on the internal resistance or voltage of the power battery. When the power battery is at risk of thermal runaway, the state of the power battery is determined to be a runaway risk state; Furthermore, the method of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, further includes: When the power battery is in the runaway risk state, the outlet temperature of the cooler is adjusted to the target temperature, the opening of the electronic expansion valve is adjusted to the target opening of the electronic expansion valve, the speed of the compressor is the target speed of the compressor, the opening of the proportional valve is the target opening of the proportional valve, and the speed of the electronic pump is the target speed of the second electronic pump, so that the cooling system is in a high cooling power operation state. The operating parameters of the power battery also include the temperature of several areas of the power battery, and the proportional valve opening includes the proportional valve opening of each cooling circuit of the cooling system. And, determining the state of the power battery based on its operating parameters includes: The uniformity of the temperature distribution of the power battery is determined based on the temperature of several regions of the power battery. When the temperature distribution of the power battery is uneven, the power battery is in a state of localized high temperature. Furthermore, the method of dynamically adjusting the control parameters of the cooling system based on the state of the power battery, and controlling the cooling system based on the control parameters of the cooling system to match the state of the cooling system with the state of the power battery, further includes: When the power battery is in the state of local high temperature, the opening degree of the proportional valve of each cooling circuit is independently adjusted based on the temperature of each region of the power battery, so that the cooling system is in a gradient temperature control state.

6. An electronic device, characterized in that, include: processor; as well as A memory configured to store machine-readable instructions that, when executed by the processor, perform the method as described in any one of claims 1-4.

7. A storage medium, characterized in that, The storage medium stores a computer program, which is executed by a processor according to any one of claims 1-4.

8. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method described in any one of claims 1-4.

9. A vehicle, characterized in that, The vehicle includes the electronic equipment as described in claim 6.

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