Battery thermal management simulation method, system and readable storage medium

Abstract

The present invention discloses a battery thermal management simulation method, system and readable storage medium, wherein the method comprises: obtaining first simulation data of a battery management system after thermal management modeling of an aged battery; obtaining second simulation data of an energy management system after thermal management modeling of an aged battery; simulating and correcting the temperature distribution, cooling control and charge and discharge strategy of the aged battery based on the first simulation data and the second simulation data; and using the simulated corrected data to simulate the coupling effect of physical fields, which at least includes electromagnetic coupling. The present invention proposes a correction method for battery thermal management simulation, which corrects the simulation data of thermal management of an aged battery using a battery management model and an energy management model, thereby coupling multiple physical fields after correction, to achieve an accurate simulation that is closest to the actual situation, improve the simulation effect, and improve the battery charge and discharge strategy while improving the safety of the aged battery.

Description

Technical Field

[0001] The present invention relates to the field of battery simulation technology, and more specifically, to a battery thermal management simulation method, system and readable storage medium. Background Art

[0002] Battery thermal management simulation plays a vital role in modern battery technology, especially in the application of electric vehicles, energy storage systems and consumer electronics. Battery thermal management is not only related to the efficiency and service life of the battery, but also directly affects its safety and performance stability. However, there is loss in the application of batteries. The electric vehicles of many electric vehicles have gradually aged, and safety and regulatory management need to be further strengthened.

[0003] However, currently, there is a lack of multiple monitoring system simulations in the thermal management simulation methods for aged batteries. Due to the increase in uncontrollable factors in aged batteries, multiple corrections cannot be made using a single detection system simulation. Therefore, the simulation of aged batteries needs to be further optimized. Summary of the invention

[0004] The purpose of the present invention is to provide a battery thermal management simulation method, system and readable storage medium, and propose a correction method for battery thermal management simulation. The simulation data of the thermal management of an aging battery is corrected by using a battery management model and an energy management model, and then multiple physical fields are coupled after the correction to achieve an accurate simulation that is closest to the actual situation, improve the simulation effect, and improve the battery charging and discharging strategy while improving the safety of the aging battery.

[0005] A first aspect of the present invention provides a battery thermal management simulation method, comprising the following steps: Acquire first simulation data of the battery management system after thermal management modeling of the aged battery; Obtaining second simulation data of the energy management system after thermal management modeling of aged batteries; Performing simulation correction on the temperature distribution, cooling control and charging and discharging strategy of the aged battery based on the first simulation data and the second simulation data; The simulated corrected data is used to simulate coupling effects of physical fields, which at least include electromagnetic coupling.

[0006] In this solution, the first simulation data of the battery management system after the aged battery thermal management modeling is obtained specifically includes: The first simulation data is obtained based on the battery management system obtaining the modeling data related to the battery itself within a preset time after the aging battery thermal management model is modeled, wherein: Obtain target data based on the battery status monitored within a preset time, wherein the target data includes SOC, SOH and SOF; Collect the hot spots generated by the internal resistance of the aging battery within the preset time, and compare the standard temperature with the battery temperature change within the preset time to obtain the internal resistance heat; Obtain the charging rate, charging / discharging voltage and discharging power of the current aged battery within a preset time; Acquire response data of the cooling system within a preset time, wherein the response data includes a change in coolant temperature and a change in flow rate.

[0007] In this solution, the second simulation data of the energy management system after the aged battery thermal management modeling is obtained specifically includes: The second simulation data is obtained based on the modeling data related to the battery and the vehicle within a preset time after the battery management system acquires the thermal management model of the aging battery, wherein: Obtaining energy scheduling data based on energy flow data from the energy storage device to the load within a preset time; Collect battery temperature changes within a preset time to obtain battery temperature fluctuation data; Obtain the charge / discharge voltage and power of the current aged battery within a preset time; The adjustment data of the liquid cooling system within a preset time is obtained, wherein the adjustment data includes an adjusted flow rate of the coolant and an additional startup unit.

[0008] In this solution, the temperature distribution and cooling control of the aged battery are simulated and corrected based on the first simulation data and the second simulation data, specifically including: When the temperature distribution is corrected, the battery temperature change and the battery temperature fluctuation data are mapped in time to correct the hot spots generated by the battery internal resistance within a preset time, and after the hot spots are corrected, the temperature distribution data is obtained based on the internal resistance heat combined with the corrected hot spots; When the cooling control is corrected, the cooling control data is obtained by clustering based on the mapping of the response data and the adjustment data on the temperature.

[0009] In this solution, the charge and discharge strategy of the aged battery is simulated and corrected based on the first simulation data and the second simulation data, specifically including: When the charging strategy is modified, data mapping is performed on the charging voltage of the battery to determine the voltage difference between the charging voltage of the battery management system and the charging voltage of the energy management system. If the voltage difference is within the preset voltage difference range, the charging voltage of the battery management system is used for modification, otherwise the charging voltage of the energy management system is used for modification; When correcting the discharge strategy, data mapping is performed on the discharge power of the battery to determine the power difference between the discharge power of the battery management system and the discharge power of the energy management system. If the power difference is within a preset power difference range, the discharge power of the energy management system is used for correction; otherwise, the discharge power of the battery management system is used for correction.

[0010] In this scheme, the simulated corrected data is used to simulate the coupling effect of the physical field, which at least includes electromagnetic coupling, specifically including: The corrected temperature distribution data, cooling control data and charging and discharging strategy are placed in a multi-physics simulation framework for joint solution, where the multi-physics simulation includes electromagnetic coupling and chemical coupling; The current Joule heating and heat conduction convection are calculated based on the electromagnetic field model, and the charge transfer heat and polarization heat are calculated based on the chemical field model, so as to dynamically update the simulated temperature distribution; After the temperature distribution is updated, the updated cooling control and charging and discharging strategies are output synchronously.

[0011] A second aspect of the present invention further provides a battery thermal management simulation system, comprising a memory and a processor, wherein the memory comprises a battery thermal management simulation method program, and when the battery thermal management simulation method program is executed by the processor, the following steps are implemented: Acquire first simulation data of the battery management system after thermal management modeling of the aged battery; Obtaining second simulation data of the energy management system after thermal management modeling of aged batteries; Performing simulation correction on the temperature distribution, cooling control and charging and discharging strategy of the aged battery based on the first simulation data and the second simulation data; The simulated corrected data is used to simulate coupling effects of physical fields, which at least include electromagnetic coupling.

[0012] In this solution, the first simulation data of the battery management system after the aged battery thermal management modeling is obtained specifically includes: The first simulation data is obtained based on the battery management system obtaining the modeling data related to the battery itself within a preset time after the aging battery thermal management model is modeled, wherein: Obtain target data based on the battery status monitored within a preset time, wherein the target data includes SOC, SOH and SOF; Collect the hot spots generated by the internal resistance of the aging battery within the preset time, and compare the standard temperature with the battery temperature change within the preset time to obtain the internal resistance heat; Obtain the charging rate, charging / discharging voltage and discharging power of the current aged battery within a preset time; Acquire response data of the cooling system within a preset time, wherein the response data includes a change in coolant temperature and a change in flow rate.

[0013] In this solution, the second simulation data of the energy management system after the aged battery thermal management modeling is obtained specifically includes: The second simulation data is obtained based on the modeling data related to the battery and the vehicle within a preset time after the battery management system acquires the thermal management model of the aging battery, wherein: Obtaining energy scheduling data based on energy flow data from the energy storage device to the load within a preset time; Collect battery temperature changes within a preset time to obtain battery temperature fluctuation data; Obtain the charge / discharge voltage and power of the current aged battery within a preset time; The adjustment data of the liquid cooling system within a preset time is obtained, wherein the adjustment data includes an adjusted flow rate of the coolant and an additional startup unit.

[0014] In this solution, the temperature distribution and cooling control of the aged battery are simulated and corrected based on the first simulation data and the second simulation data, specifically including: When the temperature distribution is corrected, the battery temperature change and the battery temperature fluctuation data are mapped in time to correct the hot spots generated by the battery internal resistance within a preset time, and after the hot spots are corrected, the temperature distribution data is obtained based on the internal resistance heat combined with the corrected hot spots; When the cooling control is corrected, the cooling control data is obtained by clustering based on the mapping of the response data and the adjustment data on the temperature.

[0015] In this solution, the charge and discharge strategy of the aged battery is simulated and corrected based on the first simulation data and the second simulation data, specifically including: When the charging strategy is modified, data mapping is performed on the charging voltage of the battery to determine the voltage difference between the charging voltage of the battery management system and the charging voltage of the energy management system. If the voltage difference is within the preset voltage difference range, the charging voltage of the battery management system is used for modification, otherwise the charging voltage of the energy management system is used for modification; When correcting the discharge strategy, data mapping is performed on the discharge power of the battery to determine the power difference between the discharge power of the battery management system and the discharge power of the energy management system. If the power difference is within a preset power difference range, the discharge power of the energy management system is used for correction; otherwise, the discharge power of the battery management system is used for correction.

[0016] In this scheme, the simulated corrected data is used to simulate the coupling effect of the physical field, which at least includes electromagnetic coupling, specifically including: The corrected temperature distribution data, cooling control data and charging and discharging strategy are placed in a multi-physics simulation framework for joint solution, where the multi-physics simulation includes electromagnetic coupling and chemical coupling; The current Joule heating and heat conduction convection are calculated based on the electromagnetic field model, and the charge transfer heat and polarization heat are calculated based on the chemical field model, so as to dynamically update the simulated temperature distribution; After the temperature distribution is updated, the updated cooling control and charging and discharging strategies are output synchronously.

[0017] A third aspect of the present invention provides a computer-readable storage medium, which includes a battery thermal management simulation method program for a machine. When the battery thermal management simulation method program is executed by a processor, the steps of a battery thermal management simulation method as described in any one of the above items are implemented.

[0018] The present invention discloses a battery thermal management simulation method, system and readable storage medium, and proposes a correction method for battery thermal management simulation. The simulation data of the thermal management of an aging battery is corrected by using a battery management model and an energy management model, and then multiple physical fields are coupled after the correction to achieve an accurate simulation that is closest to the actual situation, improve the simulation effect, and improve the battery charging and discharging strategy while improving the safety of the aging battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flow chart of a battery thermal management simulation method of the present invention is shown; Figure 2 A block diagram of a battery thermal management simulation system of the present invention is shown. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0022] An aged battery is a battery whose performance and structure have degraded after long-term use or multiple charge and discharge cycles, resulting in changes in its electrical and chemical properties. As the battery is used more often, its capacity gradually decreases, its internal resistance increases, and its charge and discharge efficiency decreases, causing the battery's energy density, power density, and discharge efficiency to decrease with aging. At the same time, uneven temperature, overheating, or other performance degradation phenomena may occur, increasing the risk of fire or explosion. In high-power application scenarios, overheating of aged batteries may cause thermal runaway, posing serious safety hazards. Therefore, accurate thermal management simulation of aged batteries is required.

[0023] Figure 1 A flow chart of a battery thermal management simulation method of the present application is shown.

[0024] like Figure 1 As shown, the present application discloses a battery thermal management simulation method, comprising the following steps: S102, obtaining first simulation data of a battery management system after thermal management modeling of an aged battery; S104, obtaining second simulation data of the energy management system after thermal management modeling of the aged battery; S106, performing simulation correction on the temperature distribution, cooling control, and charging and discharging strategy of the aged battery based on the first simulation data and the second simulation data; S108, using the simulated corrected data to simulate the coupling effect of the physical field, which at least includes electromagnetic coupling.

[0025] It should be noted that, in this embodiment, it is proposed to use a battery management system and an energy management system to perform dual monitoring of aging batteries, so as to optimize and correct the thermal management simulation of aging batteries, wherein firstly, the first simulation data of the battery management system after the thermal management modeling of the aging battery is obtained, and the second simulation data of the energy management system after the thermal management modeling of the aging battery is obtained, and then the temperature distribution, cooling control and charging and discharging strategies of the aging battery are simulated and corrected based on the first simulation data and the second simulation data, and finally the simulated and corrected data is used to simulate the coupling effect of the physical field, which at least includes electromagnetic coupling, wherein, since the internal resistance of the aging battery increases and the current flows slowly, the simulation of the electromagnetic coupling of the aging battery must be accurate, and therefore multiple monitoring is required for data optimization.

[0026] According to an embodiment of the present invention, the step of obtaining first simulation data of a battery management system after thermal management modeling of an aged battery specifically includes: The first simulation data is obtained based on the battery management system obtaining the modeling data related to the battery itself within a preset time after the aging battery thermal management model is modeled, wherein: Obtain target data based on the battery status monitored within a preset time, wherein the target data includes SOC, SOH and SOF; Collect the hot spots generated by the internal resistance of the aging battery within the preset time, and compare the standard temperature with the battery temperature change within the preset time to obtain the internal resistance heat; Obtain the charging rate, charging / discharging voltage and discharging power of the current aged battery within a preset time; Acquire response data of the cooling system within a preset time, wherein the response data includes a change in coolant temperature and a change in flow rate.

[0027] It should be noted that, in this embodiment, the BMS (battery management system) is responsible for monitoring parameters such as the battery's state of charge (SOC), state of health (SOH), and state of function (SOF). These parameters reflect the battery's aging, capacity decay, and internal resistance changes, and help the BMS evaluate the battery's thermal management simulation requirements. Therefore, the target data is obtained based on the battery status monitored within a preset time. Accordingly, the target data includes SOC, SOH, and SOF.

[0028] Furthermore, as the battery ages, the internal resistance will increase, resulting in an increase in the heat generated during the charging and discharging process. The increase in internal resistance not only affects the efficiency of the battery, but may also cause local overtemperature and generate hot spots, affecting the safety and service life of the battery. Since the BMS can adjust the charge and discharge rate in real time and control the generation of heat by monitoring the changes in the internal resistance of the battery, the hot spots generated by the internal resistance of the aged battery within a preset time can be collected based on the BMS, and the internal resistance heat can be obtained by comparing the standard temperature with the battery temperature changes within the preset time, where the standard temperature is the heat generation temperature of a non-aged battery within the preset time; and the charging / discharging characteristics of the aged battery will change, for example, the battery's charging efficiency will decrease, the capacity will decline, and the temperature will increase under high voltage, etc. The BMS needs to adjust the charging strategy according to the degree of battery aging, so the charging rate, charge / discharge voltage and discharge power of the current aged battery are obtained based on the preset time.

[0029] Furthermore, BMS is not only responsible for the thermal management of single cells, but also involves the coordination of the entire aging battery system (battery pack or module). In aging batteries, the performance differences between batteries may be exacerbated. BMS can optimize and adjust at the system level to ensure the overall efficient operation of the thermal management system. Therefore, it can also obtain the response data of the cooling system within a preset time, where the response data includes changes in coolant temperature and flow rate.

[0030] According to an embodiment of the present invention, the step of obtaining second simulation data of the energy management system after thermal management modeling of an aged battery specifically includes: The second simulation data is obtained based on the modeling data related to the battery and the vehicle within a preset time after the battery management system acquires the thermal management model of the aging battery, wherein: Obtaining energy scheduling data based on energy flow data from the energy storage device to the load within a preset time; Collect battery temperature changes within a preset time to obtain battery temperature fluctuation data; Obtain the charge / discharge voltage and power of the current aged battery within a preset time; The adjustment data of the liquid cooling system within a preset time is obtained, wherein the adjustment data includes an adjusted flow rate of the coolant and an additional startup unit.

[0031] It should be noted that, in this embodiment, the EMS (energy management system) is used to obtain the second simulation data, wherein the second simulation data includes energy scheduling data, battery temperature fluctuation data, charge / discharge voltage and power measured by the EMS, and adjustment data. Specifically, the energy scheduling data is obtained based on the flow data of energy from the energy storage device to the load within a preset time; the battery temperature fluctuation data is obtained by collecting the battery temperature change within a preset time; the charge / discharge voltage and power of the current aging battery are obtained within a preset time; and the adjustment data of the liquid cooling system within a preset time are obtained, wherein the adjustment data includes the adjusted flow rate of the coolant and the additional starting unit.

[0032] According to an embodiment of the present invention, the temperature distribution and cooling control of the aged battery are simulated and corrected based on the first simulation data and the second simulation data, specifically including: When the temperature distribution is corrected, the battery temperature change and the battery temperature fluctuation data are mapped in time to correct the hot spots generated by the battery internal resistance within a preset time, and after the hot spots are corrected, the temperature distribution data is obtained based on the internal resistance heat combined with the corrected hot spots; When the cooling control is corrected, the cooling control data is obtained by clustering based on the mapping of the response data and the adjustment data on the temperature.

[0033] It should be noted that, in this embodiment, how to correct the temperature distribution and cooling control is specifically described, wherein, when the temperature distribution is corrected, the battery temperature change and the battery temperature fluctuation data are mapped in time to correct the hot spot generated by the internal resistance of the battery within a preset time, and after correcting the hot spot, the temperature distribution data is obtained based on the internal resistance heat combined with the corrected hot spot, wherein the battery temperature will be reduced in value after the hot spot is corrected, and the specific reduction can be logarithmically reduced by combining the change in battery temperature measured by the BMS with the correction amount of the hot spot; and when the cooling control is corrected, the response data and the adjustment data are mapped in temperature to perform clustering to obtain the cooling control data, wherein the cooling control is specifically combined with the temperature, so it is necessary to cluster different temperatures at the temperature level to obtain cooling control data for different temperatures, and then obtain the corresponding coolant temperature and coolant flow rate.

[0034] According to an embodiment of the present invention, the charge and discharge strategy of the aged battery is simulated and corrected based on the first simulation data and the second simulation data, specifically including: When the charging strategy is modified, data mapping is performed on the charging voltage of the battery to determine the voltage difference between the charging voltage of the battery management system and the charging voltage of the energy management system. If the voltage difference is within the preset voltage difference range, the charging voltage of the battery management system is used for modification, otherwise the charging voltage of the energy management system is used for modification; When correcting the discharge strategy, data mapping is performed on the discharge power of the battery to determine the power difference between the discharge power of the battery management system and the discharge power of the energy management system. If the power difference is within a preset power difference range, the discharge power of the energy management system is used for correction; otherwise, the discharge power of the battery management system is used for correction.

[0035] It should be noted that, in this embodiment, it is specifically described how to correct the charging and discharging strategy of an aging battery. Specifically, when correcting the charging strategy, data mapping is performed on the charging voltage of the battery to determine the voltage difference between the charging voltage of the battery management system and the charging voltage of the energy management system. If the voltage difference is within a preset voltage difference range, the charging voltage of the battery management system is used for correction, otherwise the charging voltage of the energy management system is used for correction; and when correcting the discharging strategy, data mapping is performed on the discharge power of the battery to determine the power difference between the discharge power of the battery management system and the discharge power of the energy management system. If the power difference is within a preset power difference range, the discharge power of the energy management system is used for correction, otherwise the discharge power of the battery management system is used for correction.

[0036] According to an embodiment of the present invention, the simulated corrected data is used to simulate the coupling effect of the physical field, which at least includes electromagnetic coupling, specifically including: The corrected temperature distribution data, cooling control data and charging and discharging strategy are placed in a multi-physics simulation framework for joint solution, where the multi-physics simulation includes electromagnetic coupling and chemical coupling; The current Joule heating and heat conduction convection are calculated based on the electromagnetic field model, and the charge transfer heat and polarization heat are calculated based on the chemical field model, so as to dynamically update the simulated temperature distribution; After the temperature distribution is updated, the updated cooling control and charging and discharging strategies are output synchronously.

[0037] It should be noted that, in this embodiment, how to perform physical field simulation is specifically explained, wherein the simulated corrected data is first simulated, and specifically the corrected temperature distribution data, cooling control data and charge and discharge strategy are placed in a multi-physical field simulation framework for joint solution, wherein the multi-physical field simulation includes electromagnetic coupling and chemical coupling, thereby calculating the Joule heat of current and heat conduction convection based on the electromagnetic field model, and calculating the charge transfer heat and polarization heat based on the chemical field model, thereby dynamically updating the simulated temperature distribution, and at the same time, since the temperature distribution is updated, the corresponding cooling control and charge and discharge strategies will also be updated accordingly, thereby completing the thermal management simulation of the aging battery.

[0038] Figure 2 A block diagram of a battery thermal management simulation system of the present invention is shown.

[0039] like Figure 2 As shown, the present invention discloses a battery thermal management simulation system, including a memory and a processor, wherein the memory includes a battery thermal management simulation method program, and when the battery thermal management simulation method program is executed by the processor, the following steps are implemented: Acquire first simulation data of the battery management system after thermal management modeling of the aged battery; Obtaining second simulation data of the energy management system after thermal management modeling of aged batteries; Performing simulation correction on the temperature distribution, cooling control and charging and discharging strategy of the aged battery based on the first simulation data and the second simulation data; The simulated corrected data is used to simulate coupling effects of physical fields, which at least include electromagnetic coupling.

[0040] It should be noted that, in this embodiment, it is proposed to use a battery management system and an energy management system to perform dual monitoring of aging batteries, so as to optimize and correct the thermal management simulation of aging batteries, wherein firstly, the first simulation data of the battery management system after the thermal management modeling of the aging battery is obtained, and the second simulation data of the energy management system after the thermal management modeling of the aging battery is obtained, and then the temperature distribution, cooling control and charging and discharging strategies of the aging battery are simulated and corrected based on the first simulation data and the second simulation data, and finally the simulated and corrected data is used to simulate the coupling effect of the physical field, which at least includes electromagnetic coupling, wherein, since the internal resistance of the aging battery increases and the current flows slowly, the simulation of the electromagnetic coupling of the aging battery must be accurate, and therefore multiple monitoring is required for data optimization.

[0041] According to an embodiment of the present invention, the step of obtaining first simulation data of a battery management system after thermal management modeling of an aged battery specifically includes: The first simulation data is obtained based on the battery management system obtaining the modeling data related to the battery itself within a preset time after the aging battery thermal management model is modeled, wherein: Obtain target data based on the battery status monitored within a preset time, wherein the target data includes SOC, SOH and SOF; Collect the hot spots generated by the internal resistance of the aging battery within the preset time, and compare the standard temperature with the battery temperature change within the preset time to obtain the internal resistance heat; Obtain the charging rate, charging / discharging voltage and discharging power of the current aged battery within a preset time; Acquire response data of the cooling system within a preset time, wherein the response data includes a change in coolant temperature and a change in flow rate.

[0042] It should be noted that, in this embodiment, the BMS (battery management system) is responsible for monitoring parameters such as the battery's state of charge (SOC), state of health (SOH), and state of function (SOF). These parameters reflect the battery's aging, capacity decay, and internal resistance changes, and help the BMS evaluate the battery's thermal management simulation requirements. Therefore, the target data is obtained based on the battery status monitored within a preset time. Accordingly, the target data includes SOC, SOH, and SOF.

[0043] Furthermore, as the battery ages, the internal resistance will increase, resulting in an increase in the heat generated during the charging and discharging process. The increase in internal resistance not only affects the efficiency of the battery, but may also cause local overtemperature and generate hot spots, affecting the safety and service life of the battery. Since the BMS can adjust the charge and discharge rate in real time and control the generation of heat by monitoring the changes in the internal resistance of the battery, the hot spots generated by the internal resistance of the aged battery within a preset time can be collected based on the BMS, and the internal resistance heat can be obtained by comparing the standard temperature with the battery temperature changes within the preset time, where the standard temperature is the heat generation temperature of a non-aged battery within the preset time; and the charging / discharging characteristics of the aged battery will change, for example, the battery's charging efficiency will decrease, the capacity will decline, and the temperature will increase under high voltage, etc. The BMS needs to adjust the charging strategy according to the degree of battery aging, so the charging rate, charge / discharge voltage and discharge power of the current aged battery are obtained based on the preset time.

[0044] Furthermore, BMS is not only responsible for the thermal management of single cells, but also involves the coordination of the entire aging battery system (battery pack or module). In aging batteries, the performance differences between batteries may be exacerbated. BMS can optimize and adjust at the system level to ensure the overall efficient operation of the thermal management system. Therefore, it can also obtain the response data of the cooling system within a preset time, where the response data includes changes in coolant temperature and flow rate.

[0045] According to an embodiment of the present invention, the step of obtaining second simulation data of the energy management system after thermal management modeling of an aged battery specifically includes: The second simulation data is obtained based on the modeling data related to the battery and the vehicle within a preset time after the battery management system acquires the thermal management model of the aging battery, wherein: Obtaining energy scheduling data based on energy flow data from the energy storage device to the load within a preset time; Collect battery temperature changes within a preset time to obtain battery temperature fluctuation data; Obtain the charge / discharge voltage and power of the current aged battery within a preset time; The adjustment data of the liquid cooling system within a preset time is obtained, wherein the adjustment data includes an adjusted flow rate of the coolant and an additional startup unit.

[0046] It should be noted that, in this embodiment, the EMS (energy management system) is used to obtain the second simulation data, wherein the second simulation data includes energy scheduling data, battery temperature fluctuation data, charge / discharge voltage and power measured by the EMS, and adjustment data. Specifically, the energy scheduling data is obtained based on the flow data of energy from the energy storage device to the load within a preset time; the battery temperature fluctuation data is obtained by collecting the battery temperature change within a preset time; the charge / discharge voltage and power of the current aging battery are obtained within a preset time; and the adjustment data of the liquid cooling system within a preset time are obtained, wherein the adjustment data includes the adjusted flow rate of the coolant and the additional starting unit.

[0047] According to an embodiment of the present invention, the temperature distribution and cooling control of the aged battery are simulated and corrected based on the first simulation data and the second simulation data, specifically including: When the temperature distribution is corrected, the battery temperature change and the battery temperature fluctuation data are mapped in time to correct the hot spots generated by the battery internal resistance within a preset time, and after the hot spots are corrected, the temperature distribution data is obtained based on the internal resistance heat combined with the corrected hot spots; When the cooling control is corrected, the cooling control data is obtained by clustering based on the mapping of the response data and the adjustment data on the temperature.

[0048] It should be noted that, in this embodiment, how to correct the temperature distribution and cooling control is specifically described, wherein, when the temperature distribution is corrected, the battery temperature change and the battery temperature fluctuation data are mapped in time to correct the hot spot generated by the internal resistance of the battery within a preset time, and after correcting the hot spot, the temperature distribution data is obtained based on the internal resistance heat combined with the corrected hot spot, wherein the battery temperature will be reduced in value after the hot spot is corrected, and the specific reduction can be logarithmically reduced by combining the change in battery temperature measured by the BMS with the correction amount of the hot spot; and when the cooling control is corrected, the response data and the adjustment data are mapped in temperature to perform clustering to obtain the cooling control data, wherein the cooling control is specifically combined with the temperature, so it is necessary to cluster different temperatures at the temperature level to obtain cooling control data for different temperatures, and then obtain the corresponding coolant temperature and coolant flow rate.

[0049] According to an embodiment of the present invention, the charge and discharge strategy of the aged battery is simulated and corrected based on the first simulation data and the second simulation data, specifically including: When the charging strategy is modified, data mapping is performed on the charging voltage of the battery to determine the voltage difference between the charging voltage of the battery management system and the charging voltage of the energy management system. If the voltage difference is within the preset voltage difference range, the charging voltage of the battery management system is used for modification, otherwise the charging voltage of the energy management system is used for modification; When correcting the discharge strategy, data mapping is performed on the discharge power of the battery to determine the power difference between the discharge power of the battery management system and the discharge power of the energy management system. If the power difference is within a preset power difference range, the discharge power of the energy management system is used for correction; otherwise, the discharge power of the battery management system is used for correction.

[0050] It should be noted that, in this embodiment, it is specifically described how to correct the charging and discharging strategy of an aging battery. Specifically, when correcting the charging strategy, data mapping is performed on the charging voltage of the battery to determine the voltage difference between the charging voltage of the battery management system and the charging voltage of the energy management system. If the voltage difference is within a preset voltage difference range, the charging voltage of the battery management system is used for correction, otherwise the charging voltage of the energy management system is used for correction; and when correcting the discharging strategy, data mapping is performed on the discharge power of the battery to determine the power difference between the discharge power of the battery management system and the discharge power of the energy management system. If the power difference is within a preset power difference range, the discharge power of the energy management system is used for correction, otherwise the discharge power of the battery management system is used for correction.

[0051] According to an embodiment of the present invention, the simulated corrected data is used to simulate the coupling effect of the physical field, which at least includes electromagnetic coupling, specifically including: The corrected temperature distribution data, cooling control data and charging and discharging strategy are placed in a multi-physics simulation framework for joint solution, where the multi-physics simulation includes electromagnetic coupling and chemical coupling; The current Joule heating and heat conduction convection are calculated based on the electromagnetic field model, and the charge transfer heat and polarization heat are calculated based on the chemical field model, so as to dynamically update the simulated temperature distribution; After the temperature distribution is updated, the updated cooling control and charging and discharging strategies are output synchronously.

[0052] It should be noted that, in this embodiment, how to perform physical field simulation is specifically explained, wherein the simulated corrected data is first simulated, and specifically the corrected temperature distribution data, cooling control data and charge and discharge strategy are placed in a multi-physical field simulation framework for joint solution, wherein the multi-physical field simulation includes electromagnetic coupling and chemical coupling, thereby calculating the Joule heat of current and heat conduction convection based on the electromagnetic field model, and calculating the charge transfer heat and polarization heat based on the chemical field model, thereby dynamically updating the simulated temperature distribution, and at the same time, since the temperature distribution is updated, the corresponding cooling control and charge and discharge strategies will also be updated accordingly, thereby completing the thermal management simulation of the aging battery.

[0053] A third aspect of the present invention provides a computer-readable storage medium, which includes a battery thermal management simulation method program. When the battery thermal management simulation method program is executed by a processor, it implements the steps of a battery thermal management simulation method as described in any one of the above items.

[0054] The present invention discloses a battery thermal management simulation method, system and readable storage medium, and proposes a correction method for battery thermal management simulation. The simulation data of the thermal management of an aging battery is corrected by using a battery management model and an energy management model, and then multiple physical fields are coupled after the correction to achieve an accurate simulation that is closest to the actual situation, improve the simulation effect, and improve the battery charging and discharging strategy while improving the safety of the aging battery.

[0055] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0056] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0057] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0058] A person of ordinary skill in the art can understand that: all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0059] Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention can be essentially or partly reflected in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

Claims

1. A battery thermal management simulation method, characterized in that: The following steps are involved: Acquire first simulation data of the battery management system after thermal management modeling of the aged battery; Obtaining second simulation data of the energy management system after thermal management modeling of aged batteries; Performing simulation correction on the temperature distribution, cooling control, and charging and discharging strategy of the aged battery based on the first simulation data and the second simulation data; The simulated corrected data is used to simulate coupling effects of physical fields, which at least include electromagnetic coupling.

2. A battery thermal management simulation method according to claim 1, characterized in that: The step of obtaining first simulation data of the battery management system after the aged battery thermal management modeling is performed specifically includes: The first simulation data is obtained based on the battery management system obtaining the modeling data related to the battery itself within a preset time after the aging battery thermal management model is modeled, wherein: Obtain target data based on the battery status monitored within a preset time, wherein the target data includes SOC, SOH and SOF; Collect the hot spots generated by the internal resistance of the aging battery within the preset time, and compare the standard temperature with the battery temperature change within the preset time to obtain the internal resistance heat; Obtain the charging rate, charging / discharging voltage and discharging power of the current aged battery within a preset time; Acquire response data of the cooling system within a preset time, wherein the response data includes a change in coolant temperature and a change in flow rate.

3. A battery thermal management simulation method according to claim 2, characterized in that: The step of obtaining the second simulation data of the energy management system after the thermal management modeling of the aged battery specifically includes: The second simulation data is obtained based on the modeling data related to the battery and the vehicle within a preset time after the battery management system acquires the thermal management model of the aging battery, wherein: Obtaining energy scheduling data based on energy flow data from the energy storage device to the load within a preset time; Collect battery temperature changes within a preset time to obtain battery temperature fluctuation data; Obtain the charge / discharge voltage and power of the current aged battery within a preset time; The adjustment data of the liquid cooling system within a preset time is obtained, wherein the adjustment data includes an adjusted flow rate of the coolant and an additional startup unit.

4. A battery thermal management simulation method according to claim 3, characterized in that: The method further comprises: performing simulation correction on the temperature distribution and cooling control of the aged battery based on the first simulation data and the second simulation data, specifically comprising: When the temperature distribution is corrected, the battery temperature change and the battery temperature fluctuation data are mapped in time to correct the hot spots generated by the battery internal resistance within a preset time, and after the hot spots are corrected, the temperature distribution data is obtained based on the internal resistance heat combined with the corrected hot spots; When the cooling control is corrected, the cooling control data is obtained by clustering based on the mapping of the response data and the adjustment data on the temperature.

5. A battery thermal management simulation method according to claim 4, characterized in that: The charging and discharging strategy of the aged battery is simulated and corrected based on the first simulation data and the second simulation data, specifically including: When the charging strategy is modified, data mapping is performed on the charging voltage of the battery to determine the voltage difference between the charging voltage of the battery management system and the charging voltage of the energy management system. If the voltage difference is within the preset voltage difference range, the charging voltage of the battery management system is used for modification, otherwise the charging voltage of the energy management system is used for modification; When correcting the discharge strategy, data mapping is performed on the discharge power of the battery to determine the power difference between the discharge power of the battery management system and the discharge power of the energy management system. If the power difference is within a preset power difference range, the discharge power of the energy management system is used for correction; otherwise, the discharge power of the battery management system is used for correction.

6. A battery thermal management simulation method according to claim 5, characterized in that: The corrected data is used to simulate the coupling effect of the physical field, which includes at least electromagnetic coupling, including: The corrected temperature distribution data, cooling control data and charging and discharging strategy are placed in a multi-physics simulation framework for joint solution, where the multi-physics simulation includes electromagnetic coupling and chemical coupling; The current Joule heating and heat conduction convection are calculated based on the electromagnetic field model, and the charge transfer heat and polarization heat are calculated based on the chemical field model, so as to dynamically update the simulated temperature distribution; After the temperature distribution is updated, the updated cooling control and charging and discharging strategies are output synchronously.

7. A battery thermal management simulation system, characterized in that: The invention comprises a memory and a processor, wherein the memory comprises a battery thermal management simulation method program, and when the battery thermal management simulation method program is executed by the processor, the following steps are implemented: Acquire first simulation data of the battery management system after thermal management modeling of the aged battery; Obtaining second simulation data of the energy management system after thermal management modeling of aged batteries; Performing simulation correction on the temperature distribution, cooling control, and charging and discharging strategy of the aged battery based on the first simulation data and the second simulation data; The simulated corrected data is used to simulate coupling effects of physical fields, which at least include electromagnetic coupling.

8. A battery thermal management simulation system according to claim 7, characterized in that: The step of obtaining first simulation data of the battery management system after the aged battery thermal management modeling is performed specifically includes: The first simulation data is obtained based on the battery management system obtaining the modeling data related to the battery itself within a preset time after the aging battery thermal management model is modeled, wherein: Obtain target data based on the battery status monitored within a preset time, wherein the target data includes SOC, SOH and SOF; Collect the hot spots generated by the internal resistance of the aging battery within the preset time, and compare the standard temperature with the battery temperature change within the preset time to obtain the internal resistance heat; Obtain the charging rate, charging / discharging voltage and discharging power of the current aged battery within a preset time; Acquire response data of the cooling system within a preset time, wherein the response data includes a change in coolant temperature and a change in flow rate.

9. A battery thermal management simulation system according to claim 8, characterized in that: The step of obtaining the second simulation data of the energy management system after the thermal management modeling of the aged battery specifically includes: The second simulation data is obtained based on the modeling data related to the battery and the vehicle within a preset time after the battery management system acquires the thermal management model of the aging battery, wherein: Obtaining energy scheduling data based on energy flow data from the energy storage device to the load within a preset time; Collect battery temperature changes within a preset time to obtain battery temperature fluctuation data; Obtain the charge / discharge voltage and power of the current aged battery within a preset time; The adjustment data of the liquid cooling system within a preset time is obtained, wherein the adjustment data includes an adjusted flow rate of the coolant and an additional startup unit.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a battery thermal management simulation method program. When the battery thermal management simulation method program is executed by a processor, the steps of a battery thermal management simulation method as described in any one of claims 1 to 6 are implemented.

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