Thermal management control method and device of power battery, computer equipment and storage medium

Abstract

The invention provides a thermal management control method and device for a power battery, computer equipment and a storage medium, and the method comprises the steps: obtaining a plurality of charging and discharging currents of the power battery in a time interval, and calculating a mean value of the plurality of charging and discharging currents; heat management parameters are determined according to the mean value, and the heat management parameters comprise at least one of the battery target temperature, the heat management target temperature, the target water flow speed, the target water pump rotating speed, the compressor power and the fan rotating speed; and performing thermal management on the power battery according to the thermal management parameters. The heat effects of different current working conditions are treated differently, and the performance and safety of the power battery are improved.

Description

Technical Field

[0001] The present invention belongs to the field of power battery control, and specifically relates to a thermal management control method and device for a power battery, a computer device, and a storage medium. Background Art

[0002] In recent years, the new energy industry has been booming. As an important component of new energy equipment (such as automobiles, aircraft, etc.), power battery packs have also received widespread attention, especially the safety of power battery packs. The thermal management system of power battery packs is an important part of ensuring the safety of power battery packs. The thermal management system includes thermal management equipment such as air cooling and water cooling, as well as circuits and thermal management strategies used to control thermal management equipment.

[0003] At present, the thermal management strategy of power batteries is relatively simple, which is to heat or cool the power batteries based on a fixed battery target temperature. However, these control strategies do not differentiate the thermal effects of different current conditions (such as different current magnitudes and different current durations), which may increase the energy consumption of new energy equipment or affect the performance and safety of power batteries. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a thermal management control method and device, computer equipment, and storage medium for a power battery, so as to treat the thermal effects of different current conditions differently.

[0005] In order to solve or improve the above technical problems to a certain extent, according to one aspect of the present invention, a thermal management control method for a power battery is provided, the method comprising: obtaining multiple charge and discharge currents of the power battery within a time interval, and calculating the average of the multiple charge and discharge currents; determining thermal management parameters according to the average, wherein the thermal management parameters include at least one of a battery target temperature, a thermal management target temperature, a target water flow rate, a target water pump speed, a compressor power, and a fan speed; and performing thermal management on the power battery according to the thermal management parameters.

[0006] Optionally, determining the thermal management parameter according to the mean value includes: acquiring a preset current and a preset parameter; comparing the mean value with the preset current, and adjusting the preset parameter based on the comparison result to obtain the thermal management parameter.

[0007] Optionally, the time interval changes dynamically, and the mean is continuously updated as the time interval changes dynamically.

[0008] Optionally, the time interval includes a first time interval, the thermal management parameter is a battery target temperature, and the preset current includes a first current upper limit and a first current lower limit; the preset parameters are adjusted based on the comparison result to obtain the thermal management parameters, including: in response to the mean being greater than the first current upper limit, gradually increasing the battery target temperature from the preset temperature to the first temperature; obtaining an updated mean; in response to the updated mean being less than the first current lower limit, gradually decreasing the battery target temperature from the first temperature to the preset temperature.

[0009] Optionally, the time interval includes a second time interval, the thermal management parameter is the battery target temperature, and the preset current includes a second current upper limit and a second current lower limit; the preset parameters are adjusted based on the comparison result to obtain the thermal management parameters, including: in response to the mean being greater than the second current upper limit, gradually lowering the battery target temperature from the preset temperature to the second temperature; obtaining an updated mean; in response to the updated mean being less than the second current lower limit, gradually raising the battery target temperature from the second temperature to the preset temperature.

[0010] Optionally, calculating the mean of the multiple charge and discharge currents includes: obtaining the absolute value of each charge and discharge current; and averaging the absolute values ​​of the multiple charge and discharge currents as the mean of the multiple charge and discharge currents.

[0011] Optionally, calculating the mean of the multiple charge and discharge currents includes: obtaining a root mean square of the multiple charge and discharge currents as the mean of the multiple charge and discharge currents.

[0012] According to a second aspect of the present invention, a thermal management control device for a power battery is provided, comprising: a current mean acquisition module, for acquiring a plurality of charge and discharge currents of the power battery within a time interval, and calculating a mean of the plurality of charge and discharge currents; a parameter determination module, for determining a thermal management parameter according to the mean, wherein the thermal management parameter comprises at least one of a battery target temperature, a target water flow rate, and a target water pump speed; and a thermal management module, for performing thermal management on the power battery according to the thermal management parameter.

[0013] According to a third aspect of the present invention, there is provided a computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the program is executed by the processor, the steps of the method described in any one of the above claims can be implemented.

[0014] According to a fourth aspect of the present invention, there is provided a storage medium for storing a computer program, wherein the program, when executed by a computer or a processor, implements the steps of the method as claimed in any one of the preceding claims.

[0015] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the thermal management control method and device of the power battery, the computer equipment, and the storage medium of the present invention can achieve considerable technical advancement and practicality, and have wide industrial utilization value, and have at least the following advantages:

[0016] The present invention provides a thermal management control method and device for a power battery, a computer device, and a storage medium, which can adjust the thermal management parameters according to the charge and discharge current of the power battery over a period of time, and perform thermal management on the power battery based on the adjusted thermal management parameters. Thus, the thermal effects under different charge and discharge current conditions are treated differently, which can significantly improve the performance and safety of the power battery.

[0017] Furthermore, a certain time period is used as an observation window, the mean value of the charge and discharge current in the observation window is obtained and updated in real time, and the thermal management parameters are adjusted according to the updated mean value. In this way, the change of the charge and discharge current of the power battery can be monitored in time to adjust the thermal management strategy.

[0018] Further, according to the comparison result of the average value of the charge and discharge current within a period of time with the preset current, the preset parameters are adjusted to obtain the thermal management parameters. Further, when using the thermal management control method of the present application, when the comparison result meets the conditions, the parameters of the thermal management strategy set by the traditional thermal management strategy are further adjusted. If the comparison result does not meet the conditions, thermal management of the power battery is performed according to the parameters of the thermal management strategy set by the traditional thermal management strategy.

[0019] Furthermore, under short-term high-current conditions, the heat dissipation speed in a short period of time is far behind the heat generation speed of the power battery, and the battery temperature rises quickly. However, after a certain period of continuous heat dissipation and cooling, the temperature of the power battery can gradually return to a stable state. The short-term cooling effect of the traditional thermal management strategy is not significant. Through the solution of this application, the battery target temperature can be increased under short-term high-current conditions, the cooling intervention can be delayed, and the energy consumption of the whole vehicle can be reduced.

[0020] Furthermore, for long-term high-current operating conditions, the battery target temperature can be lowered to avoid the thermal management strategy being unable to meet the cooling needs of the power battery in a timely manner, affecting the performance and life of the power battery.

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a flow chart of a first thermal management control method for a power battery according to an embodiment of the present application;

[0023] Figure 2 for Figure 1 A schematic flow chart of an embodiment of step S102;

[0024] Figure 3 This is a flow chart of a second thermal management control method for a power battery according to an embodiment of the present application;

[0025] Figure 4 This is a flow chart of a second thermal management control method for a power battery according to an embodiment of the present application;

[0026] Figure 5 A schematic diagram of a dynamic time observation window according to an embodiment of the present application;

[0027] Figure 6 A schematic diagram of a relationship between different preset currents in an embodiment of the present application is provided;

[0028] Figure 7 A schematic diagram of adjusting a target temperature of a cooling battery according to an embodiment of the application;

[0029] Figure 8 It is a schematic structural diagram of a thermal management control device for a power battery according to an embodiment of the invention. DETAILED DESCRIPTION

[0030] As mentioned in the background technology, the current thermal management strategy of power batteries does not differentiate between the thermal effects of different current conditions (such as different current magnitudes and different current durations), which may affect the performance and life safety of power batteries and increase the energy consumption of new energy equipment.

[0031] It should be noted that power batteries are energy systems that provide power sources for electric vehicles, aircraft or other new energy equipment. The following explanation is given using electric vehicles as an example.

[0032] For example, high current operation of electric vehicles in high temperature environments will cause the temperature of the battery to rise, and the power battery needs to be cooled to avoid the degradation of charging and discharging performance and life safety risks caused by the temperature rise. However, many battery cooling control strategies are based on fixed temperature control targets, or will rapidly increase cooling requests when the battery temperature rises, without considering the time for which the high current is maintained. Cooling may be over-intervened under short-term high current conditions, resulting in increased cooling energy consumption. Under long-term continuous high current conditions, the cooling energy cannot be increased in time to suppress the rapid rise in battery temperature, which in turn affects battery performance and life safety.

[0033] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods and effects of the thermal management control method and device, computer equipment, and storage medium of the power battery proposed in the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0034] In one embodiment, please refer to Figure 1 As shown, the present application provides a first thermal management control method for a power battery (hereinafter referred to as the thermal management control method), including the following steps S101, S102 and S103, and each step is described in detail below.

[0035] Step S101, obtaining a plurality of charge and discharge currents of the power battery within a time interval, and calculating an average value of the plurality of charge and discharge currents.

[0036] Among them, the charge and discharge current of the power battery refers to the discharge current when the power battery supplies power to the electric vehicle, or the current when the power battery is charged. The charge and discharge current will change with the working conditions of the electric vehicle (such as acceleration conditions, deceleration conditions, overtaking conditions, parking conditions, uniform speed conditions, cruising conditions, fast charging conditions, slow charging conditions, etc.). For example, during acceleration conditions, the discharge current of the power battery increases; during deceleration conditions, the discharge current of the power battery may decrease. If the deceleration is sudden, the energy recovery function of the power battery may be triggered, and the power battery will switch from discharge to reverse charging.

[0037] The time interval is a certain period of time. The length of the time interval can be set according to needs, for example, the time interval can be set to tens of seconds, 1 minute, 2 minutes or 5 minutes.

[0038] In a specific embodiment, obtaining multiple charge and discharge currents of the power battery within a time interval may include: obtaining the charge and discharge current of the power battery once every certain time interval, and obtaining multiple charge and discharge currents within this time interval. For example, if the time interval is 10 seconds, the charge and discharge current may be sampled once every 100 ms (milliseconds) to obtain 100 charge and discharge currents. In order to capture the rapid changes in current, the sampling time interval should be shorter, and can be set to 10ms, 50ms, 100ms, etc.

[0039] In a specific embodiment, the calculating the mean of the multiple charge and discharge currents includes: obtaining the absolute value of each charge and discharge current; and averaging the absolute values ​​of the multiple charge and discharge currents as the mean of the multiple charge and discharge currents.

[0040] Among them, the charge and discharge current has a direction. In order to avoid the current in different directions from canceling each other out, the absolute value of each charge and discharge current is obtained, and the absolute values ​​of multiple charge and discharge currents are summed up to calculate the average value, and the calculation result is used as the mean of the multiple charge and discharge currents.

[0041] In another specific embodiment, the calculating the average of the multiple charge and discharge currents includes: obtaining a root mean square of the multiple charge and discharge currents as the average of the multiple charge and discharge currents.

[0042] Among them, the root mean square of the charge and discharge current can better reflect the relationship between the charge and discharge current and the heat generated by the power battery. Therefore, it is more effective to perform thermal management on the power battery based on the root mean square of multiple charge and discharge currents. In addition, the root mean square can also avoid the cancellation of currents in different directions.

[0043] Step S102, determining a thermal management parameter according to the mean value, wherein the thermal management parameter includes at least one of a battery target temperature, a thermal management target temperature, a target water flow rate, a target water pump speed, a compressor power, and a fan speed.

[0044] Step S103: performing thermal management on the power battery according to the thermal management parameters.

[0045] The influence of different mean values ​​on the thermal management parameters is preset, so that the thermal management parameters for thermal management of the power battery can be determined according to the mean value calculated in step S101.

[0046] In a specific embodiment, the thermal management parameter includes a battery target temperature, where the battery target temperature refers to a target temperature that the power battery reaches by performing thermal management on the power battery.

[0047] After the battery target temperature is determined, the power battery can be heated or cooled to reach the target temperature.

[0048] In another specific embodiment, the thermal management parameter includes a thermal management target temperature, which may be a temperature set for thermal management hardware, and the thermal management hardware may include a liquid cooling device and an air cooling device, etc. For example, when the thermal management device of the power battery is a liquid cooling device, the thermal management target temperature may be a target temperature of a coolant (such as water, ethylene glycol, or a mixture of water and ethylene glycol, etc.). For another example, when the thermal management device of the power battery is an air cooling device, the thermal management target temperature may be a target temperature of a cooling gas (such as air).

[0049] The coolant flows through the cooling channel in the power battery, and can heat or cool each cell in the power battery. By setting the temperature of the coolant, the speed of heating or cooling each cell in the power battery and the heating or cooling target can be set.

[0050] Further, when the thermal management parameter is a target temperature of the coolant, step S103 may include: setting the temperature of the coolant to the target temperature, and operating the liquid cooling system.

[0051] In another specific embodiment, the thermal management parameter includes a target water flow rate, which is applicable to a liquid cooling system. Step S103 may include performing thermal management on the power battery according to the target water flow rate, that is, setting the water flow rate in the flow channel of the liquid cooling system to the target water flow rate. By adjusting the water flow rate in the flow channel of the liquid cooling system, the speed of heating or cooling each cell in the power battery can be set.

[0052] In another specific embodiment, the thermal management parameter includes a target water pump speed, which is applicable to a liquid cooling system. Step S103 may include performing thermal management on the power battery according to the target water pump speed, that is, setting the speed of the water pump of the liquid cooling system to the target water pump speed. By adjusting the speed of the water pump, the water flow speed in the flow channel of the liquid cooling system can be changed, and the speed of heating or cooling each cell in the power battery can be set.

[0053] Furthermore, the above-mentioned water flow velocity may refer to the water flow velocity of the liquid cooling main water pipe, or may refer to the water flow velocity of one or more liquid cooling branch pipes.

[0054] In another specific embodiment, the thermal management parameters may also include compressor power or fan speed, etc. The refrigeration efficiency is adjusted by adjusting the compressor power, and the air cooling efficiency is changed by changing the fan speed.

[0055] It should be noted that the thermal management parameters include but are not limited to the above examples, and other parameters involved in the thermal management strategy of the power battery are all within the scope of the thermal management parameters in step S102. In addition, the thermal management parameters may include two or more parameters, and multiple thermal management parameters may be synchronously controlled to perform thermal management on the power battery.

[0056] pass Figure 1 The thermal management control method can adjust the thermal management parameters according to the charge and discharge current of the power battery over a period of time, and perform thermal management on the power battery based on the adjusted thermal management parameters. Thus, the thermal effects under different charge and discharge current conditions are treated differently, which can significantly improve the performance and safety of the power battery.

[0057] For example, under short-term high-current conditions (such as short-term car acceleration, overtaking, etc.), the average of the charging and discharging current within the time interval is used to determine that the high current is maintained for a short time, and there is no need to over-cool the power battery.

[0058] In one embodiment, the time interval changes dynamically, and the mean value is continuously updated as the time interval changes dynamically. That is, a certain time period is used as an observation window, the mean value of the charge and discharge current in the observation window is obtained and updated in real time, and the thermal management parameters are adjusted according to the updated mean value to execute the corresponding thermal management strategy. In this way, the changes in the charge and discharge current of the power battery can be monitored in time to adjust the thermal management strategy.

[0059] In one embodiment, see Figure 1 and Figure 2 , Figure 1 Step S102 specifically includes:

[0060] Step S1021, obtaining a preset current and preset parameters;

[0061] Step S1022, comparing the mean value with the preset current, and adjusting the preset parameter based on the comparison result to obtain the thermal management parameter.

[0062] The preset current is one or more preset current values.

[0063] The preset parameter corresponds to the thermal management parameter and is a preset parameter value. For example, when the thermal management parameter is the battery target temperature, the preset parameter is the preset target battery temperature; when the thermal management parameter is the thermal management target temperature, the preset parameter is the preset temperature of the thermal management hardware; when the thermal management parameter is the target water flow rate, the preset parameter is the preset water flow rate; when the thermal management parameter is the target water pump speed, the preset parameter is the preset water pump speed.

[0064] Optionally, the preset parameters are parameters of a thermal management strategy set by a traditional thermal management strategy when the thermal management control method of the present application is not considered.

[0065] Furthermore, the traditional thermal management strategy does not introduce the mean of multiple charge and discharge currents within a time interval, which will change the mean and the parameters of the thermal management strategy. Generally, the parameters of the thermal management strategy are determined according to the average temperature or the maximum temperature of the current power battery, and this parameter can be used as a preset parameter. That is, when using the thermal management control method of the present application, when the comparison result meets the conditions, the parameters of the thermal management strategy set by the traditional thermal management strategy are further adjusted. That is, if the comparison result does not meet the conditions, thermal management of the power battery is performed according to the parameters of the thermal management strategy set by the traditional thermal management strategy.

[0066] Optionally, the preset parameter may be adjusted in a variety of ways, such as increasing or decreasing the value of the preset parameter, increasing the preset parameter first and then decreasing it, or decreasing the preset parameter first and then increasing it, etc.

[0067] In this embodiment, the preset parameters are adjusted to obtain the thermal management parameters according to the comparison result between the average value of the charge and discharge current within a period of time and the preset current. Further, when the thermal management control method of the present application is used, when the comparison result meets the conditions, the parameters of the thermal management strategy set by the traditional thermal management strategy are further adjusted. If the comparison result does not meet the conditions, thermal management is performed on the power battery according to the parameters of the thermal management strategy set by the traditional thermal management strategy.

[0068] In one embodiment, the time interval includes a first time interval, and the first time interval is set to a shorter time period, such as 10 seconds, 30 seconds, 1 minute, 2 minutes, etc.

[0069] The thermal management parameters include a battery target temperature, where the battery target temperature is a target temperature reached by cooling the power battery through a liquid cooling device or an air cooling device.

[0070] The preset current includes a first current upper limit I1 and a first current lower limit I2, that is, two preset currents are set for the first interval: I1 and I2, and I1 is greater than I2.

[0071] Figure 2 In step S1022, adjusting the preset parameters based on the comparison result to obtain the thermal management parameters may include: in response to the average value being greater than the first current upper limit I1, increasing the battery target temperature from the preset temperature T steady Raise to the first temperature T1; obtain an updated mean value; in response to the updated mean value being less than the first current lower limit I2, lower the battery target temperature to the preset temperature T steady .

[0072] Among them, if the average value is greater than the first current upper limit I1, it proves that in the first time interval, the average value of the charging and discharging current of the power battery is large, indicating that the power battery enters a short-term high-current operating condition. At this time, if the battery target temperature is set according to the traditional thermal management strategy, it may affect the energy consumption of the entire vehicle.

[0073] This is because under short-term high-current conditions, the heat dissipation speed in a short period of time is far behind the heat generation speed of the power battery, and the battery temperature rises quickly. However, after a certain period of continuous heat dissipation and cooling, the temperature of the power battery can gradually return to a stable state. The short-term cooling effect of traditional thermal management strategies is not significant. After research, the inventors found that under short-term high-current conditions, the battery target temperature can be increased, cooling intervention can be delayed, and the energy consumption of the entire vehicle can be reduced.

[0074] In addition, the mean value is continuously updated. If it is detected that the updated mean value is less than the first current lower limit I2, the short-term high current condition has ended, and the battery target temperature can be adjusted back to T steadyThat is, if the special operating condition of short-term high current does not occur, the thermal management of the power battery is still performed according to the traditional thermal management strategy.

[0075] Optional, preset temperature T steady is a preset temperature value, and its value can be set as needed. In a specific embodiment, the preset temperature T steady When the thermal management control method of the present application is not considered, the target temperature of the battery is set by the conventional thermal management strategy.

[0076] Optionally, the first temperature T1 can be set to a fixed temperature value; the first temperature T1 can also be a preset temperature T steady +△T, that is, the first temperature T1 is based on T steady get.

[0077] Optionally, the battery target temperature is set to a preset temperature T steady The temperature T1 may be increased to the first temperature T1, which may include: increasing the battery target temperature from a preset temperature T steady Gradually increase to the first temperature T1.

[0078] Optionally, the battery target temperature is lowered to the preset temperature T steady , which may include: gradually lowering the battery target temperature to the preset temperature T steady .

[0079] That is, the adjustment of the battery target temperature is not completed at one time, but is completed in multiple times. In order to ensure a smooth transition of the battery target temperature, the battery target temperature can be adjusted in small amounts multiple times until it reaches the current adjustment target.

[0080] In a specific embodiment, the temperature change amount for each adjustment is set, and the battery target temperature is adjusted once every period of time.

[0081] In one embodiment, see Figure 3 , Figure 3 A flow chart of a second thermal management control method for a power battery according to an embodiment of the present application is provided, and the method comprises the following steps:

[0082] Step S301, obtaining multiple charge and discharge currents of the power battery in a first time interval, and calculating an average of the multiple charge and discharge currents;

[0083] Step S302, determine whether the mean is greater than I1;

[0084] In response to the judgment result of S302 being yes, executing step S303 and step S304;

[0085] In step S303, the battery target temperature is changed from T steadyGradually increase to T1;

[0086] Step S304, continuously determine whether the updated mean value is less than I2; in response to the determination result of step S304 being yes, execute step S305 to gradually reduce the battery target temperature to T steady ;

[0087] In response to the judgment result of S302 being no, step S303 is executed to set the battery target temperature to T steady .

[0088] In one embodiment, the time interval includes a second time interval. Compared with the first time interval, the second time interval is set to a longer time period, such as 1 minute, 3 minutes, 5 minutes, etc. The thermal management parameter includes a battery target temperature.

[0089] The preset current includes a second current upper limit I3 and a second current lower limit I4, that is, two preset currents are set for the second interval: I3 and I4, and I3 is greater than I4.

[0090] Figure 2 Step S1022 includes: adjusting the preset parameters based on the comparison result to obtain the thermal management parameters, including: in response to the average value being greater than the second current upper limit I3, increasing the battery target temperature from the preset temperature T steady Lower the battery target temperature to the preset temperature T2; obtain an updated mean value; in response to the updated mean value being less than the second current lower limit I4, raise the battery target temperature to the preset temperature T steady .

[0091] Among them, if the average value is greater than the second current upper limit I3, it proves that in the second time interval, the average value of the charge and discharge current of the power battery is large, indicating that the power battery enters a long-term high-current operating condition. At this time, if the battery target temperature is set according to the traditional thermal management strategy, the cooling temperature may be too high, and the power battery cannot be quickly cooled to meet the cooling needs of the power battery. For long-term high-current operating conditions, the battery target temperature can be lowered to avoid the thermal management strategy being unable to meet the cooling needs of the power battery in a timely manner, affecting the performance and life of the power battery.

[0092] In addition, the mean value is continuously updated. If it is detected that the updated mean value is less than the second current lower limit I4, the long-term high current operation condition has ended, and the battery target temperature can be adjusted back to T steady That is, if there is no special operating condition such as long-term high current, the power battery is still thermally managed according to the traditional thermal management strategy.

[0093] Optional, preset temperature T steadyis a preset temperature value, and its value can be set as needed. In a specific embodiment, the preset temperature T steady When the thermal management control method of the present application is not considered, the target temperature of the battery is set by the conventional thermal management strategy.

[0094] Optionally, the second temperature T2 can be set to a fixed temperature value; the second temperature T2 can also be a preset temperature T steady -ΔT', that is, the second temperature T2 is based on T steady get.

[0095] Optionally, the battery target temperature is set by a preset temperature T steady The lowering to the second temperature T2 may include: lowering the battery target temperature from a preset temperature T steady Gradually lower the temperature to the second temperature T2.

[0096] Optionally, the battery target temperature is raised to the preset temperature T steady , which may include: gradually lowering the battery target temperature to the preset temperature T steady .

[0097] The above description of the gradual adjustment process will not be repeated here.

[0098] See also Figure 4 , Figure 4 A flowchart of a third thermal management control method for a power battery according to an embodiment of the present application is provided, and the method comprises the following steps:

[0099] Step S401, obtaining multiple charge and discharge currents of the power battery in a second time interval, and calculating an average of the multiple charge and discharge currents;

[0100] Step S402, determine whether the mean is greater than I3;

[0101] In response to the judgment result of S402 being yes, executing step S403 and step S404;

[0102] In step S403, the battery target temperature is changed from T steady Gradually downgrade to T2;

[0103] Step S404, continuously determine whether the updated mean value is less than I4; in response to the determination result of step S404 being yes, execute step S405 to gradually increase the battery target temperature to T steady ;

[0104] In response to the judgment result of S402 being no, step S403 is executed to set the battery target temperature to T steady .

[0105] In one embodiment, two observation windows, a first time interval (also referred to as a short-term observation window) and a second time interval (also referred to as a long-term observation window), can be set simultaneously to determine whether a short-term high-current condition and a long-term high-current condition occur. If both the mean calculated by the short-term observation window and the mean calculated by the long-term observation window require adjustment of the battery target temperature, the battery target temperature is adjusted according to the mean calculated by the long-term observation window. That is, compared with the short-term high-current condition, the thermal management control strategy for the long-term high-current condition has a higher priority.

[0106] In one embodiment, see Figures 5 to 7 , Figure 5 A schematic diagram of a dynamic time observation window in an embodiment of the present application is provided. Figure 6 A schematic diagram of the relationship between different preset currents in an embodiment of the present application is provided. Figure 7 A schematic diagram of battery target temperature adjustment according to an embodiment of the application.

[0107] In this embodiment, two observation windows, the first time interval and the second time interval, are set simultaneously to determine whether a short-term high current condition or a long-term high current condition occurs. Figure 5 It can detect that a short-term high current condition occurs first and then a long-term high current condition occurs. Figure 6 The relationship between the real-time updated mean value and the first current upper limit I1, the first current lower limit I2, the second current upper limit I3, and the second current lower limit I4 can be reflected in the table. Figure 5 In the short-term high current condition, the battery target temperature is determined by T steady Gradually increase to T steady +△T, wait until the short-term high current condition ends, then gradually adjust back to T steady ;against Figure 5 In the long-term high-current operation, the battery target temperature is determined by T steady Gradually down to T steady -△T', wait until the long-term high current condition ends, and then gradually adjust back to T steady .

[0108] It should be noted that in this application Figures 3 to 7 The thermal management control method provided is illustrated by taking the battery target temperature as an example of the thermal management parameter. There is a correlation between other thermal management parameters (such as thermal management target temperature, target water flow rate, target water pump speed, compressor power, fan speed, etc.) and the battery target temperature. According to their correlation, corresponding thermal management control methods can be designed to achieve similar effects.

[0109] In one embodiment, the thermal management control method of the present application is executed by a device such as a car or an aircraft, and can be further executed by a battery management system (BMS) or other controller on the device. The length of the first time interval, the length of the second time interval, and various thermal management parameters, such as battery target temperature, thermal management target temperature, target water flow rate, target water pump speed, etc., can be stored in a disk, and the thermal management control method can be called and executed by the BMS or other controller.

[0110] In another embodiment, the thermal management control method of the present application can also be performed by a device such as a car or an aircraft and a server (such as a cloud). The BMS or other controller on the device such as a car or an aircraft exchanges data with the server to execute the thermal management control method.

[0111] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0112] In one embodiment, based on the same inventive concept, the present application embodiment also provides a thermal management control device for a power battery, see Figure 8 , the device may include:

[0113] A current mean value acquisition module 801 is used to acquire multiple charge and discharge currents of the power battery within a time interval and calculate the mean value of the multiple charge and discharge currents;

[0114] a parameter determination module 802, configured to determine a thermal management parameter according to the mean value, wherein the thermal management parameter includes at least one of a battery target temperature, a thermal management target temperature, a target water flow rate, a target water pump speed, a compressor power, and a fan speed;

[0115] The thermal management module 803 is used to perform thermal management on the power battery according to the thermal management parameters.

[0116] In one embodiment, Figure 8 The parameter determination module 802 described in the embodiment includes:

[0117] An acquisition unit, used for acquiring a preset current and preset parameters;

[0118] The determination unit is used to compare the average value with the preset current, and adjust the preset parameter based on the comparison result to obtain the thermal management parameter.

[0119] In one embodiment, the time interval changes dynamically, and the mean value is continuously updated as the time interval changes dynamically.

[0120] In one embodiment, the time interval includes a first time interval, the thermal management parameter includes a battery target temperature, and the preset current includes a first current upper limit and a first current lower limit; and the determining unit includes:

[0121] a first adjustment subunit, configured to gradually increase a battery target temperature from a preset temperature to a first temperature in response to the average value being greater than the first current upper limit;

[0122] A mean update subunit, used to obtain an updated mean;

[0123] The second adjustment subunit is configured to gradually reduce the battery target temperature to the preset temperature in response to the updated average being less than the first current lower limit.

[0124] In one embodiment, the time interval includes a second time interval, the thermal management parameter includes a battery target temperature, and the preset current includes a second current upper limit and a second current lower limit; and the determining unit includes:

[0125] a third adjustment subunit, configured to gradually reduce the battery target temperature from a preset temperature to a second temperature in response to the average value being greater than the second current upper limit;

[0126] A mean update subunit, used to obtain an updated mean;

[0127] The fourth adjustment subunit is configured to gradually increase the battery target temperature to the preset temperature in response to the updated average being less than the second current lower limit.

[0128] In one embodiment, Figure 8 The current mean value acquisition module 801 in the embodiment includes:

[0129] An absolute value calculation unit, used to obtain the absolute value of each charge and discharge current;

[0130] The first averaging unit is used to average the absolute values ​​of the multiple charge and discharge currents as the average value of the multiple charge and discharge currents.

[0131] In one embodiment, Figure 8The current average value acquisition module 801 in the embodiment is further used to acquire the root mean square of the multiple charge and discharge currents as the average value of the multiple charge and discharge currents.

[0132] For details on the thermal management control device for power batteries, please refer to Figures 1 to 7 The description of thermal management control in will not be repeated here.

[0133] According to another embodiment of the present invention, a computer device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and when the program is executed by the processor, the steps of the thermal management control method of the power battery in any of the above embodiments can be implemented. The computer device may refer to a device such as a car or an aircraft, or may refer to a BMS or other controller.

[0134] The computer device may include a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface, the display unit and the input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a thermal management control method for a power battery is implemented. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0135] According to another embodiment of the present invention, a storage medium is provided, which may be a computer-readable storage medium for storing a computer program, which, when executed by a computer or a processor, implements the steps of the thermal management control method for a power battery in any of the above-mentioned embodiments.

[0136] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0137] Those skilled in the art will appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described herein may be implemented as electronic hardware, computer software, or a combination of both.

[0138] In order to show the interchangeability between hardware and software, various schematic components, blocks, modules, circuits and steps are generally described above according to their functionality. Such functionality is implemented in hardware form or software form depending on the specific application and the design restrictions imposed on the overall system. Those skilled in the art can implement the described functionality in a variable manner for specific specific applications, but such implementation decisions should not be understood as causing deviations from the scope of the present application.

[0139] Although only some of the specific embodiments of the present application are described, it should be understood by those skilled in the art that the present application can be implemented in many other forms without departing from its subject matter and scope. Therefore, the examples and embodiments shown are considered to be illustrative rather than restrictive, and the present application may include various modifications and substitutions without departing from the spirit and scope of the present application as defined in the appended claims.

[0140] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A thermal management control method for a power battery, characterized in that: The method comprises: Acquiring multiple charge and discharge currents of the power battery within a time interval, and calculating an average value of the multiple charge and discharge currents; Determining a thermal management parameter according to the mean, wherein the thermal management parameter includes at least one of a battery target temperature, a thermal management target temperature, a target water flow rate, a target water pump speed, a compressor power, and a fan speed; The power battery is thermally managed according to the thermal management parameters.

2. The method according to claim 1, characterized in that Determining the thermal management parameter according to the mean value includes: Obtaining preset current and preset parameters; The average value is compared with the preset current, and the preset parameter is adjusted based on the comparison result to obtain the thermal management parameter.

3. The method according to claim 1 or 2, characterized in that: The time interval changes dynamically, and the mean value is continuously updated as the time interval changes dynamically.

4. The method according to claim 2, characterized in that: The time interval includes a first time interval, the thermal management parameter includes a battery target temperature, and the preset current includes a first current upper limit and a second current lower limit; The step of adjusting the preset parameters based on the comparison result to obtain the thermal management parameters includes: In response to the average value being greater than the first current upper limit, raising the battery target temperature from a preset temperature to a first temperature; Get the updated mean; In response to the updated average value being less than the first current lower limit, the battery target temperature is adjusted to the preset temperature.

5. The method according to claim 2 or 4, characterized in that: The time interval includes a second time interval, the thermal management parameter includes a battery target temperature, and the preset current includes a second current upper limit and a second current lower limit; The step of adjusting the preset parameters based on the comparison result to obtain the thermal management parameters includes: In response to the average being greater than the second current upper limit, gradually lowering the battery target temperature from a preset temperature to a second temperature; Get the updated mean; In response to the updated average being less than the second current lower limit, the battery target temperature is gradually increased to the preset temperature.

6. The method according to claim 1, characterized in that The calculating the average of the plurality of charge and discharge currents comprises: Obtain the absolute value of each charge and discharge current; The absolute values ​​of the plurality of charge and discharge currents are averaged to obtain a mean value of the plurality of charge and discharge currents.

7. The method according to claim 1, characterized in that The calculating the average of the plurality of charge and discharge currents comprises: A root mean square value of the multiple charge and discharge currents is obtained as an average value of the multiple charge and discharge currents.

8. A thermal management control device for a power battery, characterized in that: include: A current average acquisition module, which acquires a plurality of charge and discharge currents of the power battery within a time interval and calculates a mean value of the plurality of charge and discharge currents; a parameter determination module, configured to determine a thermal management parameter according to the mean value, wherein the thermal management parameter includes at least one of a battery target temperature, a thermal management target temperature, a target water flow rate, a target water pump speed, a compressor power, and a fan speed; A thermal management module is used to perform thermal management on the power battery according to the thermal management parameters.

9. A computer device comprising a memory and a processor, characterized in that: The memory stores a computer program, which, when executed by the processor, can implement the steps of the method according to any one of claims 1 to 7.

10. A storage medium for storing a computer program, characterized in that: When the program is executed by a computer or a processor, the program implements the steps of the method according to any one of claims 1 to 7.

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