Sodium-ion energy storage battery thermal management system control method, device and electronic equipment

Abstract

This invention provides a control method, device, and electronic device for the thermal management system of a sodium-ion energy storage battery, relating to the technical field of sodium-ion battery thermal management. The method predicts the battery temperature change at each time step after the current moment. If the temperature at a first target moment exceeds the preset temperature control range of the sodium-ion energy storage battery's thermal management system, a pre-adjustment temperature difference is determined based on the temperature at the first target moment and the preset temperature control limit. If the corrected target temperature obtained by adding the pre-adjustment temperature difference to the sodium-ion energy storage battery within the first time step after the current moment is within the preset temperature control range, the target temperature of the sodium-ion energy storage battery at a second target moment is configured as the corrected target temperature. This invention avoids the problem of thermal management lag by adopting a pre-adjustment method with a pre-set target temperature, achieving temperature control adjustment that follows changes in battery operating conditions and reducing the amplitude of battery operating temperature variations.

Description

Technical Field

[0001] This invention relates to the technical field of thermal management of sodium-ion batteries, and in particular to a control method, device and electronic equipment for a thermal management system of sodium-ion energy storage batteries. Background Technology

[0002] Sodium-ion batteries operate similarly to lithium-ion batteries, with sodium ions moving back and forth between the positive and negative electrodes during charging and discharging. During charging, ions are released from the positive electrode and inserted into the negative electrode via the electrolyte; the reverse occurs during discharging. However, sodium ions have a larger radius than lithium ions. Furthermore, variations in the negative electrode material's structure, electrolyte, and interfacial reactions mean that the insertion and extraction of sodium ions from the positive electrode during charging and discharging require more energy interaction. This, combined with the heat generated by ion migration within the electrolyte due to resistance, results in more complex external temperature variations. Unlike lithium-ion batteries, which generate similar amounts of heat during charging and discharging, sodium-ion batteries experience significantly greater heat dissipation during discharging than during charging, and this heat dissipation varies considerably throughout operation.

[0003] Figure 1 This diagram illustrates a system structure for thermal management of sodium-ion batteries in the prior art. Existing technologies typically use temperature sensors to monitor the surface temperature of sodium-ion batteries. However, the heat generated by a sodium-ion battery during operation is transferred from the inside out; therefore, the surface temperature data cannot accurately reflect the actual temperature changes inside the battery. Due to the inaccuracy of the temperature data, the implementation of thermal management strategies lags behind the actual temperature changes inside the battery. This lag may cause significant fluctuations in the thermal power consumption of the sodium-ion battery, resulting in the internal temperature not stabilizing within a suitable range, affecting the battery's operating efficiency and lifespan. In extreme cases, inaccurate temperature control may lead to thermal runaway and serious consequences. Summary of the Invention

[0004] The purpose of this invention is to provide a control method, device, and electronic device for the thermal management system of a sodium-ion energy storage battery, so as to avoid the technical problem of lagging thermal management of sodium-ion energy storage batteries in the prior art.

[0005] In a first aspect, the present invention provides a thermal management system control method for a sodium-ion energy storage battery, comprising: acquiring the power curve, the battery state-of-energy-voltage curve, the current operating voltage, power, and temperature of the sodium-ion energy storage battery; based on the power curve, the battery state-of-energy-voltage curve, the current operating voltage, and power, determining all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current time, obtaining a set of temperature changes; and based on the set of temperature changes and the temperature of the sodium-ion energy storage battery at the current time, determining the temperature of the sodium-ion energy storage battery at a first target time; wherein, the first target time represents the time after a delay of M time cycles from the current time; and determining... If the temperature at the first target time exceeds the preset temperature control range of the sodium-ion energy storage battery's thermal management system, a pre-adjustment temperature difference is determined based on the temperature at the first target time and the preset temperature control limit. Based on the current temperature, the first temperature change, and the pre-adjustment temperature difference, a corrected target temperature for the sodium-ion energy storage battery at the second target time is determined. Here, the first temperature change represents the temperature change of the sodium-ion energy storage battery within the first time cycle after the current time; the second target time represents the time after a delay of one time cycle from the current time. If the corrected target temperature is determined to be within the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target time is configured as the corrected target temperature.

[0006] In an optional implementation, based on the power curve, the battery state-of-energy-voltage curve, the current operating voltage and power, all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current time are determined, resulting in a set of temperature changes. This includes: determining the power of the sodium-ion energy storage battery at each time cycle after the current time based on the power curve and the current power; determining the operating voltage of the sodium-ion energy storage battery at each time cycle after the current time based on the current voltage, the energy changes within each time cycle, and the battery state-of-energy-voltage curve; and determining the operating voltage of the sodium-ion energy storage battery at each time cycle after the current time based on the current voltage, the energy changes within each time cycle, and the battery state-of-energy-voltage curve; and determining the operating voltage of the sodium-ion energy storage battery at the current time... The operating voltage and power at the start and end times of the i-th time cycle are used to determine the change in heat dissipation of the sodium-ion energy storage battery in the i-th time cycle after the current time; where i takes values ​​from 1 to M. Based on the change in heat dissipation in the i-th time cycle, the height of the sodium-ion energy storage battery, the battery's thermal conductivity, and the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system, the temperature change of the sodium-ion energy storage battery in the i-th time cycle after the current time is determined. Based on all temperature changes of the sodium-ion energy storage battery in the 1st to Mth time cycles after the current time, a set of temperature changes is constructed.

[0007] In an optional implementation, the change in thermal power consumption of the sodium-ion energy storage battery within the i-th time cycle after the current time is determined based on the operating voltage and power corresponding to the start time and the operating voltage and power corresponding to the end time of the i-th time cycle after the current time. This includes: obtaining the rated power of the sodium-ion energy storage battery; calculating the first thermal power consumption of the sodium-ion energy storage battery at the start time based on the rated power, the operating voltage and power corresponding to the start time of the i-th time cycle after the current time; calculating the second thermal power consumption of the sodium-ion energy storage battery at the end time based on the rated power, the operating voltage and power corresponding to the end time of the i-th time cycle after the current time; and calculating the change in thermal power consumption of the sodium-ion energy storage battery within the i-th time cycle after the current time based on the first thermal power consumption and the second thermal power consumption.

[0008] In an optional implementation, the method further includes: if the corrected target temperature is determined to be lower than the lower limit of the preset temperature control range, configuring the target temperature of the sodium-ion energy storage battery at the second target time as the lower limit; if the corrected target temperature is determined to be higher than the upper limit of the preset temperature control range, configuring the target temperature of the sodium-ion energy storage battery at the second target time as the upper limit.

[0009] In an optional implementation, the method further includes: if the temperature at the first target time is determined to be within a preset temperature control range, determining whether the preset phase transition voltage is within the voltage range formed by the working voltage at the first target time and the working voltage at the third target time, or whether the working voltage at the first target time is equal to the preset rated voltage; wherein, the preset phase transition voltage represents the voltage at which the battery positive electrode material undergoes a phase transition; the third target time represents the time after a delay of M-1 time cycles from the current time; if yes, then based on the temperature at the current time and the first temperature change, configuring the target temperature of the sodium-ion energy storage battery at the second target time; if no, then determining whether the temperature of the sodium-ion energy storage battery at a time after a delay of M+1 time cycles from the current time is within the preset temperature control range.

[0010] In an optional implementation, the method further includes: configuring the sodium-ion energy storage battery at a preset rated temperature; setting the target temperature of the sodium-ion energy storage battery as a preset lower limit; monitoring the surface temperature of the sodium-ion energy storage battery and determining the target time delay for the surface temperature to drop from the preset rated temperature to the preset lower limit; determining the thermal conduction delay coefficient of the sodium-ion energy storage battery based on the preset rated temperature, the preset lower limit, and the target time delay; and determining the timing of the thermal management system's temperature prediction of the sodium-ion energy storage battery based on the preset temperature accuracy threshold and the thermal conduction delay coefficient.

[0011] In an optional implementation, based on the change in heat dissipation within the i-th time cycle, the height of the sodium-ion energy storage battery, the battery's thermal conductivity, and the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system, the temperature change of the sodium-ion energy storage battery within the i-th time cycle after the current moment is determined, including: using a formula Calculate the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment; where... This indicates the height of the sodium-ion energy storage battery. This represents the change in heat dissipation of the sodium-ion energy storage battery during the i-th time cycle after the current moment. This indicates the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system. This indicates the thermal conductivity of a sodium-ion energy storage battery. This represents the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment.

[0012] Secondly, the present invention provides a thermal management system control device for a sodium-ion energy storage battery, comprising: an acquisition module for acquiring the power curve, the battery state-of-energy-voltage curve, the current operating voltage, power, and temperature of the sodium-ion energy storage battery; a first determination module for determining, based on the power curve, the battery state-of-energy-voltage curve, the current operating voltage, and power, all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current time, to obtain a set of temperature changes; a second determination module for determining, based on the set of temperature changes and the current temperature of the sodium-ion energy storage battery, the temperature of the sodium-ion energy storage battery at a first target time; wherein, the first target time represents the time after a delay of M time cycles from the current time; and a third determination module. The first module is used to determine a pre-adjustment temperature difference based on the temperature at the first target time and the preset temperature control limit when the temperature at the first target time exceeds the preset temperature control range of the thermal management system of the sodium-ion energy storage battery. The fourth determination module is used to determine the corrected target temperature of the sodium-ion energy storage battery at the second target time based on the current temperature, the first temperature change, and the pre-adjustment temperature difference. The first temperature change represents the temperature change of the sodium-ion energy storage battery within the first time cycle after the current time. The second target time represents the time after a delay of one time cycle from the current time. The first configuration module is used to configure the target temperature of the sodium-ion energy storage battery at the second target time as the corrected target temperature when the corrected target temperature is determined to be within the preset temperature control range.

[0013] Thirdly, the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the computer program to implement the steps of the thermal management system control method for the sodium-ion energy storage battery of any of the foregoing embodiments.

[0014] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions, which, when executed by a processor, implement the thermal management system control method for a sodium-ion energy storage battery according to any of the foregoing embodiments.

[0015] The thermal management system control method for sodium-ion energy storage batteries provided by this invention predicts the battery temperature change in various time cycles within a short period after the current moment. If the temperature at a first target moment exceeds the preset temperature control range of the sodium-ion energy storage battery's thermal management system, a pre-adjustment temperature difference is determined based on the temperature at the first target moment and the preset temperature control limit. If the corrected target temperature obtained by adding the pre-adjustment temperature difference to the sodium-ion energy storage battery in the first time cycle after the current moment is within the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target moment is configured as the corrected target temperature. In other words, this invention avoids the problem of thermal management lag by adopting a pre-adjustment method with a pre-set target temperature, achieving temperature control adjustment that follows changes in battery operating conditions, reducing the amplitude of battery operating temperature changes, and improving the efficiency and lifespan of the sodium-ion energy storage battery. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a system structure for thermal management of sodium-ion batteries in the prior art.

[0018] Figure 2 A flowchart of a thermal management system control method for a sodium-ion energy storage battery provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the rated heat dissipation change curve of a sodium-ion energy storage battery during the discharge process.

[0020] Figure 4 A schematic diagram of the rated thermal power consumption change curve during the charging process of a sodium-ion energy storage battery;

[0021] Figure 5 A functional block diagram of a thermal management system control device for a sodium-ion energy storage battery provided in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0025] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] Example 1

[0027] Figure 2 A flowchart of a thermal management system control method for a sodium-ion energy storage battery provided in an embodiment of the present invention is shown below. Figure 2 As shown, the method specifically includes the following steps:

[0028] Step S102: Obtain the power curve, battery state-of-energy-voltage curve, current operating voltage, power, and temperature of the sodium-ion energy storage battery.

[0029] Specifically, the method provided in this embodiment of the invention is applicable to the thermal management of sodium-ion batteries during charging / discharging. If the method is applied to the charging process, the power curve and the battery state-of-energy (SOE-V) curve in this step correspond to the curves changing during the charging process; if the method is applied to the discharging process, the power curve and the battery SOE-V curve in this step correspond to the curves changing during the discharging process. The power curve is the curve showing the change in power of the sodium-ion energy storage battery over time; the battery SOE-V curve is also known as the SOE-V curve. Based on this curve, this embodiment of the invention can obtain the operating voltage of the sodium-ion energy storage battery after a certain energy change, given an arbitrary operating voltage. Energy is equal to the product of power and time. To accurately obtain the power and operating voltage of the sodium-ion energy storage battery at different times, this embodiment of the invention uses the current operating voltage and power as a reference; that is, the current operating voltage and power are used as the starting data for changes in operating voltage and power.

[0030] To reduce the temperature fluctuation of sodium-ion energy storage batteries, this invention adopts a pre-target temperature design. Specifically, if a significant temperature change in the sodium-ion energy storage battery is predicted at a future time, the thermal management system (i.e., temperature control system) preemptively adjusts the battery temperature in the opposite direction. In other words, if a higher temperature is predicted in the future, the battery is cooled down in advance, and vice versa. This avoids the technical problem of the battery temperature not being maintained within a suitable range, affecting the battery's operating efficiency and lifespan. Therefore, at the beginning of the method's operation, this invention also needs to obtain the current temperature of the sodium-ion energy storage battery as the starting data for temperature changes. As described in the background section, existing technologies can only collect temperature data from the battery surface. Therefore, unless otherwise specified, the temperature described in this invention refers to the battery surface temperature.

[0031] Step S104: Based on the power curve, the battery energy state-voltage curve, the operating voltage and power at the current moment, determine all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current moment, and obtain the set of temperature changes.

[0032] To accurately control the temperature of sodium-ion energy storage batteries, it is necessary to determine the amount of temperature change over time. Since the power and voltage of sodium-ion energy storage batteries do not change linearly during charging / discharging, it is necessary to predict the temperature change on a time-by-time basis. This embodiment of the invention does not specifically limit the duration of the time-by-time cycle; users can set it according to their actual temperature control accuracy requirements. Obviously, the higher the temperature control accuracy, the shorter the duration of the time-by-time cycle should be.

[0033] The thermal power consumption of a sodium-ion energy storage battery can be calculated based on its power and operating voltage. Furthermore, the temperature change can be calculated based on the change in thermal power consumption between different times. Therefore, based on the power curve, the battery state-voltage curve, and the operating voltage and power at the current time, all temperature changes within the first to Mth time cycles after the current time can be determined, thus obtaining the set of temperature changes. Initially, M is set to 1.

[0034] Step S106: Based on the set of temperature changes and the temperature of the sodium-ion energy storage battery at the current moment, determine the temperature of the sodium-ion energy storage battery at the first target moment.

[0035] After obtaining all temperature changes of the sodium-ion energy storage battery during the first to Mth time cycles after the current moment, the temperature of the sodium-ion energy storage battery at the first target moment can be obtained by the following formula: ;in, This indicates the sodium-ion energy storage battery at the current moment. temperature, This represents the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment. This represents the time of the sodium-ion energy storage battery after a delay of M-1 time ticks from the current time. temperature, This indicates that the sodium-ion energy storage battery was at the first target time. The temperature, where the first target time represents the time after a delay of M time ticks from the current time.

[0036] Step S108: If the temperature at the first target time exceeds the preset temperature control range of the thermal management system of the sodium-ion energy storage battery, a pre-adjustment temperature difference is determined based on the temperature at the first target time and the preset temperature control limit.

[0037] In this embodiment of the invention, the preset temperature control range of the thermal management system of the sodium-ion energy storage battery is expressed as ( , ), This indicates the lower limit of the preset temperature control range. This indicates the upper temperature limit corresponding to the preset temperature control range. If the temperature at the first target time... or If the temperature at the first target moment exceeds the preset temperature control range of the sodium-ion energy storage battery's thermal management system, then the difference between the two is used as the pre-adjustment amount for temperature, i.e., the pre-adjustment temperature difference. .

[0038] .

[0039] Step S110: Based on the current temperature, the first temperature change, and the pre-adjusted temperature difference, determine the corrected target temperature of the sodium-ion energy storage battery at the second target time.

[0040] Specifically, if it's not necessary to pre-set the temperature adjustment amount at the current moment, then to ensure the sodium-ion battery temperature is as stable as possible, given that the first temperature change has already been calculated (where the first temperature change represents the temperature change of the sodium-ion battery within the first time cycle after the current moment), to reduce the actual temperature change of the sodium-ion battery, the battery temperature adjustment amount set by the thermal management system at the current moment needs to be equal to the first temperature change amount. That is, in this case, the thermal management system at the current moment... Set the sodium-ion energy storage battery at the second target time. Target temperature for: The second target time refers to the time after a delay of one time tick from the current time. This indicates the sodium-ion energy storage battery at the current moment. temperature, This indicates the first temperature change.

[0041] However, if it is necessary to set the temperature adjustment amount in advance at the current moment, in order to reduce the temperature change of the sodium-ion energy storage battery, the embodiments of the present invention need to calculate the corrected target temperature at the second target moment based on the current temperature, the first temperature change amount, and the pre-adjustment temperature difference, that is, ;in, This indicates the corrected target temperature at the second target time. This indicates that the temperature difference is adjusted in advance. .

[0042] Step S112: If the target temperature for correction is determined to be within the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target time is configured as the target temperature for correction.

[0043] After calculating the corrected target temperature at the second target time, it is necessary to further determine whether the corrected target temperature is within the preset temperature control range. If it is determined that it does not exceed the preset temperature control range, then the target temperature of the sodium-ion energy storage battery at the second target time is directly configured as the corrected target temperature, that is, .

[0044] The thermal management system control method for sodium-ion energy storage batteries provided in this invention predicts the battery temperature change over short periods after the current moment. If the temperature at a first target moment exceeds the preset temperature control range of the sodium-ion energy storage battery's thermal management system, a pre-adjustment temperature difference is determined based on the temperature at the first target moment and the preset temperature control limit. If the corrected target temperature obtained by adding the pre-adjustment temperature difference to the sodium-ion energy storage battery within the first time period after the current moment is within the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target moment is configured as the corrected target temperature. In other words, this invention avoids the problem of thermal management lag by adopting a pre-adjustment method with a pre-set target temperature, achieving temperature control adjustment that follows changes in battery operating conditions, reducing the amplitude of battery operating temperature changes, and improving the efficiency and lifespan of the sodium-ion energy storage battery.

[0045] In one optional implementation, the method provided by the embodiments of the present invention further includes the following steps:

[0046] Step S113: If the target temperature is determined to be lower than the lower limit of the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target time is set as the lower limit.

[0047] Step S114: If the target temperature is determined to be greater than the upper limit of the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target time is set as the upper limit of the temperature.

[0048] Based on the above description, the target temperature at the second target moment can be expressed as:

[0049] In other words, the target temperature of the battery at the second target time is set within the maximum adjustable range. After the second target time is reached, the second target time can be used as the current time, and the method provided in this embodiment of the invention can continue to be applied to thermal management of the sodium-ion energy storage battery.

[0050] In an optional implementation, step S104 above, based on the power curve, the battery state-of-energy-voltage curve, and the current operating voltage and power, determines all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current moment, obtaining a set of temperature changes, specifically including the following steps:

[0051] Step S1041: Based on the power curve and the power at the current moment, determine the power of the sodium-ion energy storage battery at each time interval after the current moment.

[0052] Specifically, after obtaining the power curve and the power at the current moment, based on the duration of each time tick, the power at the moment corresponding to each time tick after the current moment can be obtained from the power curve. For example, if the current moment is... One time beat is Then take the current time as The power is the initial power, which can be obtained from the power curve. time, time, time…… The power corresponding to a given moment.

[0053] Step S1042: Based on the current voltage, the energy change within each time cycle, and the battery energy state-voltage curve, determine the operating voltage of the sodium-ion energy storage battery at the time corresponding to each time cycle after the current moment.

[0054] In this embodiment of the invention, the energy change within the i-th time cycle is equal to the product of the power corresponding to the start time of the i-th time cycle and the duration of the corresponding time cycle. Therefore, after determining the power corresponding to the start time of each time cycle, the energy change within each time cycle can be calculated, and then the current time can be used as the reference point. The operating voltage is the initial voltage, which can be obtained from the battery's state-of-energy-voltage curve. time, time, time…… The operating voltage at any given time.

[0055] Step S1043: Based on the operating voltage and power of the sodium-ion energy storage battery at the start time and the operating voltage and power at the end time of the i-th time cycle after the current time, determine the change in heat dissipation of the sodium-ion energy storage battery in the i-th time cycle after the current time; where i takes values ​​from 1 to M.

[0056] According to the principle of thermal power consumption calculation, the initial thermal power consumption can be calculated based on the operating voltage and power corresponding to the start time of the i-th time cycle, and the final thermal power consumption can be calculated based on the operating voltage and power corresponding to the end time of the i-th time cycle. Subtracting these two thermal power consumption values ​​yields the change in thermal power consumption within the i-th time cycle. Similarly, the M changes in thermal power consumption within the 1st to Mth time cycles can be calculated.

[0057] Step S1044: Based on the change in heat dissipation within the i-th time cycle, the height of the sodium-ion energy storage battery, the thermal conductivity of the battery, and the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system, determine the temperature change of the sodium-ion energy storage battery within the i-th time cycle after the current moment.

[0058] In this embodiment of the invention, the internal temperature of the sodium-ion battery ,in, The height of the sodium-ion energy storage battery (the height of the battery center) is indicated by the unit (m). This represents the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system, expressed in m². 2 ), The thermal conductivity of a sodium-ion energy storage battery is expressed in W / mK. The thermal power consumption of a sodium-ion battery is expressed in W. This indicates the surface temperature of the battery, and is usually located at the top of the battery. The unit is (K). This indicates the highest internal temperature of the battery, expressed in Kelvin (K).

[0059] Based on the formula for battery internal temperature, it can be seen that after temperature equilibrium, changes in battery thermal power consumption will cause changes in battery temperature. The change in thermal power consumption within the i-th time cycle is then calculated. Then, combined with the height of sodium-ion energy storage batteries Battery thermal conductivity Contact area between sodium-ion energy storage batteries and the liquid cooling base plate in the thermal management system This allows us to calculate the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment.

[0060] Step S1045: Based on all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current moment, construct a set of temperature changes.

[0061] In an optional implementation, step S1043 above, based on the operating voltage and power of the sodium-ion energy storage battery at the start time and the end time of the i-th time cycle after the current time, determines the change in heat dissipation of the sodium-ion energy storage battery within the i-th time cycle after the current time, specifically including the following steps:

[0062] Step S10431: Obtain the rated power of the sodium-ion energy storage battery.

[0063] Step S10432: Based on the rated power, the operating voltage and power of the sodium-ion energy storage battery at the start time of the i-th time cycle after the current time, calculate the first thermal power consumption of the sodium-ion energy storage battery at the start time.

[0064] Step S10433: Based on the rated power, the operating voltage and power of the sodium-ion energy storage battery at the end time of the i-th time cycle after the current time, calculate the second thermal power consumption of the sodium-ion energy storage battery at the end time.

[0065] Step S10434: Based on the first thermal power consumption and the second thermal power consumption, calculate the change in thermal power consumption of the sodium-ion energy storage battery in the i-th time cycle after the current moment.

[0066] Based on the rated charge and discharge thermal power consumption parameters of sodium-ion energy storage batteries, to simplify the temperature control process, this embodiment of the invention uses a two-stage curve fitting method to fit the change in rated thermal power consumption during the discharge process, and a one-stage curve fitting method to fit the change in rated thermal power consumption during the charging process:

[0067] ;

[0068] ;

[0069] in, This indicates the rated discharge thermal power consumption of a sodium-ion energy storage battery, expressed in W. This indicates the rated charging thermal power consumption of a sodium-ion energy storage battery, expressed in W. , , , , , All represent the preset thermal power coefficient; This indicates the operating voltage of the sodium-ion energy storage battery. This indicates the battery's maximum operating voltage, expressed in V. This indicates the minimum operating voltage of the battery, expressed in V. This represents the voltage at which the positive electrode material of the battery undergoes a phase transition, and is expressed in V.

[0070] For example, the rated discharge thermal power coefficient of a 180Ah square sodium-ion battery , , =20、 , =10、 , =2.7、 =4、 =1.5. Therefore, ; ; Figure 3 and Figure 4 The above two example formulas are illustrated with curve diagrams. Figure 3 This is a schematic diagram of the rated heat dissipation change curve of a sodium-ion energy storage battery during the discharge process. Figure 4 This is a schematic diagram of the rated thermal power consumption change curve during the charging process of a sodium-ion energy storage battery.

[0071] Based on the expression for the rated heat dissipation during charging / discharging, the expressions for the fitting curves of the actual heat dissipation and charging of sodium-ion energy storage batteries operating under any power state are as follows: ;

[0072] ;in, This indicates the rated power of the sodium-ion energy storage battery. This indicates the actual power of the sodium-ion energy storage battery.

[0073] according to and As shown in the formula, given the rated power of the sodium-ion energy storage battery, its operating voltage and power at any given moment, the corresponding thermal power consumption at that moment can be calculated. Referring to the above method, the first thermal power consumption corresponding to the start moment and the second thermal power consumption corresponding to the end moment of the i-th time cycle after the current moment can be calculated separately. The difference between the first and second thermal power consumption can then be used to obtain the change in thermal power consumption of the sodium-ion energy storage battery within the i-th time cycle after the current moment.

[0074] In an optional implementation, step S1044 above, based on the change in heat dissipation within the i-th time cycle, the height of the sodium-ion energy storage battery, the battery's thermal conductivity, and the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system, determines the temperature change of the sodium-ion energy storage battery within the i-th time cycle after the current moment, specifically including the following:

[0075] Using formulas Calculate the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment; where... This indicates the height of the sodium-ion energy storage battery. This represents the change in heat dissipation of the sodium-ion energy storage battery during the i-th time cycle after the current moment. This indicates the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system. This indicates the thermal conductivity of a sodium-ion energy storage battery. This represents the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment.

[0076] To ensure a relatively stable battery temperature, the thermal management system is set to regulate the battery temperature. Requires the amount of change in battery internal temperature They are equal. Therefore, according to the formula for calculating the internal temperature of the battery, the embodiments of the present invention utilize the formula... Calculate the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment.

[0077] In one optional implementation, the method provided by the embodiments of the present invention further includes the following steps:

[0078] Step S1091: If the temperature at the first target time is determined to be within the preset temperature control range, determine whether the preset phase change voltage is within the voltage range formed by the working voltage at the first target time and the working voltage at the third target time, or whether the working voltage at the first target time is equal to the preset rated voltage; wherein, the preset phase change voltage represents the voltage when the battery positive electrode material undergoes a phase change; the third target time represents the time after the current time is delayed by M-1 time cycles.

[0079] If yes, proceed to step S1092 below; otherwise, proceed to step S1093 below.

[0080] Step S1092: Based on the current temperature and the first temperature change, configure the target temperature of the sodium-ion energy storage battery at the second target time.

[0081] Step S1093: Determine whether the temperature of the sodium-ion energy storage battery at the moment M+1 time cycles after the current moment is within the preset temperature control range.

[0082] It is known that during the discharge process of a sodium-ion battery, a surge in heat generation occurs when the positive electrode material undergoes a phase transition reaction. According to the thermal power simulation curve, when the battery voltage is... At this time, the battery may experience a sudden increase in heat dissipation, which can easily cause the battery temperature to exceed the temperature control range. Therefore, if it has been determined that the temperature at the first target time is within the preset temperature control range, and the preset phase change voltage is within the voltage range formed by the working voltage at the first and third target times, it means that the battery temperature change caused by the phase change reaction of the positive electrode material occurs within the Mth time cycle, and the battery temperature has not exceeded the preset temperature control range. In this case, it is only necessary to use the sum of the current temperature and the first temperature change as the target temperature of the sodium-ion energy storage battery at the second target time, that is, there is no need to set the temperature intervention adjustment amount in advance. However, if the preset phase change voltage is not within the voltage range formed by the working voltage at the first and third target times, it means that the state of the positive electrode material undergoing a phase change reaction has not been reached in the first M time cycles. In this case, it is necessary to continue to predict whether the battery temperature at the time after the M+1th time cycle is within the preset temperature control range, until the battery voltage exceeds the preset temperature control range. The method for calculating the temperature at the moment after the (M+1)th time cycle can be found above and will not be repeated here.

[0083] If thermal management is applied to a sodium-ion battery during charging, then if the temperature at the first target time is within the preset temperature control range, and the operating voltage at the first target time is equal to the preset rated voltage (during charging, the preset rated voltage is also the battery's maximum operating voltage), then... If the battery temperature remains within the preset temperature control range throughout the entire charging process, then the sum of the current temperature and the first temperature change can be used as the target temperature for the sodium-ion battery at the second target time. In other words, there is no need to set an advance temperature adjustment. However, if the operating voltage at the first target time is not equal to the preset rated voltage, it means that the battery has not reached a fully charged state within the first M time cycles. In this case, it is necessary to continue predicting whether the battery temperature is within the preset temperature control range after the (M+1)th time cycle, until the battery voltage reaches the target temperature. .

[0084] In one optional implementation, the method provided by the embodiments of the present invention further includes the following steps:

[0085] Step S201: Configure the sodium-ion energy storage battery to a preset rated temperature.

[0086] Step S202: Set the target temperature of the sodium-ion energy storage battery to the preset lower limit of the temperature range.

[0087] Step S203: Monitor the surface temperature of the sodium-ion energy storage battery and determine the target time delay for the surface temperature to drop from the preset rated temperature to the preset lower limit.

[0088] Step S204: Determine the thermal conduction delay coefficient of the sodium-ion energy storage battery based on the preset rated temperature, the preset lower limit of the temperature, and the target time delay.

[0089] Step S205: Determine the timing of the thermal management system's temperature prediction for the sodium-ion energy storage battery based on the preset temperature accuracy threshold and the thermal conduction delay coefficient.

[0090] Considering the significant increase in complexity after sodium-ion energy storage batteries are assembled in the energy storage system, and the mutual interference between the heat conduction path and heat dissipation path of the temperature control system, it is difficult to obtain an accurate result by theoretical calculation of the delay time from the start of temperature adjustment by the temperature control system to the sodium-ion energy storage battery reaching the target temperature. In this embodiment of the invention, the heat conduction delay time from the start of cooling by the temperature control system to the battery temperature reaching the expected target is calibrated by performing initialization operation, and the time cycle Δt in this embodiment of the invention is obtained by the relationship between temperature difference and delay time.

[0091] First, allow the battery to stand still, configuring the sodium-ion energy storage battery to be at a preset rated temperature. (Battery preset technical parameters), Next, set the target temperature of the sodium-ion energy storage battery to the preset lower limit. And record the time when control begins. Next, the surface temperature of the sodium-ion energy storage battery is monitored, and the time when the surface temperature drops from the preset rated temperature to the preset lower limit is determined. Therefore, the target delay can be calculated. .

[0092] Therefore, the thermal conduction time delay coefficient of sodium-ion energy storage batteries can be obtained as follows: And, the relationship between the temperature change and the thermal conduction time delay in sodium-ion energy storage batteries: ,in, This represents the heat conduction delay time from when the temperature control system sets the target temperature until the sodium-ion energy storage battery reaches the target temperature, expressed in seconds (s). The temperature difference between the target temperature set for the temperature control system and the current temperature of the sodium-ion energy storage battery, expressed in °C.

[0093] Therefore, after determining the preset temperature accuracy threshold (e.g., 1℃ or 0.2℃), the user substitutes this threshold into the above formula. The desired result This refers to the time cycle used for temperature prediction based on the target temperature accuracy requirements of the temperature control system.

[0094] In summary, the embodiments of this invention aim to provide a thermal management system control method for sodium-ion energy storage batteries. This method fully considers the thermal power consumption characteristics of the battery during charging and discharging, as well as the heat conduction delay of the temperature control system. Specifically, addressing the problem of a surge in thermal power consumption caused by the phase change reaction of the positive electrode material during the discharge process of sodium-ion batteries, this invention adopts a pre-adjustment method based on the ultra-short-term battery thermal power consumption prediction results, achieving synchronous adjustment of temperature control and battery operating conditions. This thermal management method reduces the fluctuation range of battery temperature changes, which is beneficial to improving the efficiency and lifespan of sodium-ion energy storage batteries, while ensuring the economical operation of the heat dissipation system.

[0095] Example 2

[0096] This invention also provides a thermal management system control device for a sodium-ion energy storage battery. This device is mainly used to execute the thermal management system control method for a sodium-ion energy storage battery provided in Embodiment 1 above. The following is a detailed description of the thermal management system control device for a sodium-ion energy storage battery provided in this invention.

[0097] Figure 5 A functional block diagram of a thermal management system control device for a sodium-ion energy storage battery provided in an embodiment of the present invention is shown below. Figure 5 As shown, the device mainly includes: an acquisition module 11, a first determination module 12, a second determination module 13, a third determination module 14, a fourth determination module 15, and a first configuration module 16, wherein:

[0098] The acquisition module 11 is used to acquire the power curve, battery state-voltage curve, current operating voltage, power and temperature of the sodium-ion energy storage battery.

[0099] The first determining module 12 is used to determine all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current moment, based on the power curve, the battery energy state-voltage curve, the operating voltage and power at the current moment, and to obtain a set of temperature changes.

[0100] The second determining module 13 is used to determine the temperature of the sodium-ion energy storage battery at a first target time based on the set of temperature changes and the temperature of the sodium-ion energy storage battery at the current time; wherein the first target time represents the time after the current time is delayed by M time cycles.

[0101] The third determining module 14 is used to determine the pre-adjustment temperature difference based on the temperature at the first target time and the preset temperature control limit when the temperature at the first target time exceeds the preset temperature control range of the thermal management system of the sodium-ion energy storage battery.

[0102] The fourth determining module 15 is used to determine the corrected target temperature of the sodium-ion energy storage battery at the second target time based on the current temperature, the first temperature change, and the pre-adjusted temperature difference; wherein, the first temperature change represents the temperature change of the sodium-ion energy storage battery within the first time cycle after the current time; and the second target time represents the time after the current time is delayed by one time cycle.

[0103] The first configuration module 16 is used to configure the target temperature of the sodium-ion energy storage battery at the second target time as the corrected target temperature when it is determined that the corrected target temperature is within the preset temperature control range.

[0104] The thermal management system control device for a sodium-ion energy storage battery provided in this embodiment predicts the battery temperature change over short periods of time following the current moment. If the temperature at a first target moment exceeds the preset temperature control range of the sodium-ion energy storage battery's thermal management system, a pre-adjustment temperature difference is determined based on the temperature at the first target moment and the preset temperature control limit. If the corrected target temperature obtained by adding the pre-adjustment temperature difference to the sodium-ion energy storage battery within the first time period following the current moment is within the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target moment is configured as the corrected target temperature. In other words, this embodiment avoids the problem of thermal management lag by adopting a pre-adjustment method with a pre-set target temperature, achieving temperature control adjustment that follows changes in battery operating conditions, reducing the amplitude of battery operating temperature changes, and improving the efficiency and lifespan of the sodium-ion energy storage battery.

[0105] Optionally, the first determining module 12 includes:

[0106] The first determining unit is used to determine the power of the sodium-ion energy storage battery at each time step after the current time, based on the power curve and the power at the current time.

[0107] The second determining unit is used to determine the operating voltage of the sodium-ion energy storage battery at the time corresponding to each time delay after the current time, based on the voltage at the current moment, the energy change within each time cycle, and the battery energy state-voltage curve.

[0108] The third determining unit is used to determine the change in heat dissipation of the sodium-ion energy storage battery within the i-th time cycle after the current time, based on the working voltage and power corresponding to the start time and the working voltage and power corresponding to the end time of the i-th time cycle after the current time; where i takes the value from 1 to M.

[0109] The fourth determining unit is used to determine the temperature change of the sodium-ion energy storage battery in the i-th time cycle after the current moment, based on the change in heat dissipation within the i-th time cycle, the height of the sodium-ion energy storage battery, the thermal conductivity of the battery, and the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system.

[0110] The construction unit is used to construct a set of temperature changes based on all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current moment.

[0111] Optionally, the third determining unit is specifically used for:

[0112] Obtain the rated power of the sodium-ion energy storage battery.

[0113] Based on the rated power, the operating voltage and power of the sodium-ion energy storage battery at the start of the i-th time cycle after the current time, calculate the first thermal power consumption of the sodium-ion energy storage battery at the start time.

[0114] Based on the rated power, the operating voltage and power of the sodium-ion energy storage battery at the end of the i-th time cycle after the current time, calculate the second thermal power consumption of the sodium-ion energy storage battery at the end time.

[0115] Based on the first thermal power consumption and the second thermal power consumption, calculate the change in thermal power consumption of the sodium-ion energy storage battery in the i-th time cycle after the current moment.

[0116] Optionally, the device is also used for:

[0117] If the target temperature is determined to be lower than the lower limit of the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target time is set as the lower limit.

[0118] If the target temperature is determined to be greater than the upper limit of the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target time is set as the upper limit of the temperature.

[0119] Optionally, the device is also used for:

[0120] If the temperature at the first target time is determined to be within the preset temperature control range, it is determined whether the preset phase change voltage is within the voltage range formed by the working voltage at the first target time and the working voltage at the third target time, or whether the working voltage at the first target time is equal to the preset rated voltage; wherein, the preset phase change voltage represents the voltage at which the battery positive electrode material undergoes a phase change; the third target time represents the time after the current time is delayed by M-1 time cycles.

[0121] If so, then based on the current temperature and the first temperature change, configure the target temperature of the sodium-ion energy storage battery at the second target time.

[0122] If not, determine whether the temperature of the sodium-ion energy storage battery at the moment M+1 time beats after the current time is within the preset temperature control range.

[0123] Optionally, the device is also used for:

[0124] The sodium-ion energy storage battery is configured to be at a preset rated temperature.

[0125] The target temperature for the sodium-ion energy storage battery is set to the lower limit of the preset temperature.

[0126] Monitor the surface temperature of the sodium-ion energy storage battery and determine the target time delay for the surface temperature to drop from the preset rated temperature to the preset lower limit.

[0127] The thermal conduction delay coefficient of sodium-ion energy storage battery is determined based on the preset rated temperature, the preset lower limit of temperature, and the target time delay.

[0128] Based on the preset temperature accuracy threshold and the thermal conduction delay coefficient, the timing of the thermal management system's temperature prediction for the sodium-ion energy storage battery is determined.

[0129] Optionally, the fourth determining unit is specifically used for:

[0130] Using formulas Calculate the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment; where... This indicates the height of the sodium-ion energy storage battery. This represents the change in heat dissipation of the sodium-ion energy storage battery during the i-th time cycle after the current moment. This indicates the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system. This indicates the thermal conductivity of a sodium-ion energy storage battery. This represents the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment.

[0131] Example 3

[0132] See Figure 6 This invention provides an electronic device, which includes a processor 60, a memory 61, a bus 62, and a communication interface 63. The processor 60, the communication interface 63, and the memory 61 are connected via the bus 62. The processor 60 is used to execute executable modules, such as computer programs, stored in the memory 61.

[0133] The memory 61 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 63 (which can be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc.

[0134] Bus 62 can be an ISA bus, PCI bus, or EISA bus, etc. Buses can be divided into address buses, data buses, control buses, etc. For ease of representation, Figure 6 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0135] The memory 61 is used to store the program. After receiving the execution instruction, the processor 60 executes the program. The method executed by the apparatus defined by the process disclosed in any of the foregoing embodiments of the present invention can be applied to the processor 60 or implemented by the processor 60.

[0136] Processor 60 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 60 or by instructions in software form. Processor 60 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this invention can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 61. Processor 60 reads the information in memory 61 and, in conjunction with its hardware, completes the steps of the above method.

[0137] The computer program product of the thermal management system control method, device and electronic device of sodium-ion energy storage battery provided in the embodiments of the present invention includes a computer-readable storage medium storing non-volatile program code executable by a processor. The instructions included in the program code can be used to execute the methods in the preceding method embodiments. For specific implementation, please refer to the method embodiments, which will not be repeated here.

[0138] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0139] If the functionality is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0140] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0141] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0142] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0143] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a thermal management system of a sodium-ion energy storage battery, characterized in that, include: Obtain the power curve, battery state-of-energy-voltage curve, current operating voltage, power, and temperature of the sodium-ion energy storage battery; Based on the power curve, the battery energy state-voltage curve, the current operating voltage and power, determine all temperature changes of the sodium-ion energy storage battery in the first to Mth time cycles after the current moment, and obtain the set of temperature changes. Based on the set of temperature changes and the temperature of the sodium-ion energy storage battery at the current moment, the temperature of the sodium-ion energy storage battery at the first target moment is determined; wherein, the first target moment represents the moment after a delay of M time ticks from the current moment; If it is determined that the temperature at the first target time exceeds the preset temperature control range of the thermal management system of the sodium-ion energy storage battery, a pre-adjustment temperature difference is determined based on the difference between the temperature at the first target time and the preset temperature control limit. Based on the current temperature, the first temperature change, and the pre-adjusted temperature difference, the corrected target temperature of the sodium-ion energy storage battery at the second target time is determined; wherein, the first temperature change represents the temperature change of the sodium-ion energy storage battery within the first time cycle after the current time; the second target time represents the time after a delay of one time cycle from the current time; the formula for the corrected target temperature of the sodium-ion energy storage battery at the second target time is expressed as: ;in, This indicates the corrected target temperature at the second target time. This indicates that the temperature difference is adjusted in advance. This indicates the sodium-ion energy storage battery at the current moment. temperature, Indicates the first temperature change; If the temperature at the first target time is determined to be within the preset temperature control range, it is determined whether the preset phase transition voltage is within the voltage range formed by the working voltage at the first target time and the working voltage at the third target time, or whether the working voltage at the first target time is equal to the preset rated voltage; wherein, the preset phase transition voltage represents the voltage at which the battery positive electrode material undergoes a phase transition; the third target time represents the time after the current time is delayed by M-1 time cycles; If so, then based on the current temperature and the first temperature change, configure the target temperature of the sodium-ion energy storage battery at the second target time; If not, determine whether the temperature of the sodium-ion energy storage battery at the moment after a delay of M+1 time cycles is within the preset temperature control range; If the corrected target temperature is determined to be within the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target time is configured as the corrected target temperature.

2. The thermal management system control method for a sodium-ion energy storage battery according to claim 1, characterized in that, Based on the power curve, the battery state-of-energy-voltage curve, and the current operating voltage and power, all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current moment are determined, resulting in a set of temperature changes, including: Based on the power curve and the power at the current moment, determine the power of the sodium-ion energy storage battery at each time interval after the current moment. Based on the voltage at the current moment, the energy change within each time cycle, and the battery energy state-voltage curve, determine the operating voltage of the sodium-ion energy storage battery at the moment corresponding to each time cycle after the current moment. Based on the operating voltage and power of the sodium-ion energy storage battery at the start time and the end time of the i-th time cycle after the current time, the change in heat dissipation of the sodium-ion energy storage battery within the i-th time cycle after the current time is determined; where i takes values ​​from 1 to M. Based on the change in heat dissipation within the i-th time cycle, the height of the sodium-ion energy storage battery, the thermal conductivity of the battery, and the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system, the temperature change of the sodium-ion energy storage battery within the i-th time cycle after the current moment is determined. Based on all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current moment, the set of temperature changes is constructed.

3. The thermal management system control method for a sodium-ion energy storage battery according to claim 2, characterized in that, Based on the operating voltage and power of the sodium-ion energy storage battery at the start and end times of the i-th time cycle after the current time, determine the change in heat dissipation of the sodium-ion energy storage battery within the i-th time cycle after the current time, including: Obtain the rated power of the sodium-ion energy storage battery; Based on the rated power, the operating voltage and power of the sodium-ion energy storage battery at the start time of the i-th time cycle after the current time, calculate the first thermal power consumption of the sodium-ion energy storage battery at the start time. Based on the rated power, the operating voltage and power of the sodium-ion energy storage battery at the end time of the i-th time cycle after the current time, calculate the second thermal power consumption of the sodium-ion energy storage battery at the end time. Based on the first thermal power consumption and the second thermal power consumption, calculate the change in thermal power consumption of the sodium-ion energy storage battery in the i-th time cycle after the current moment.

4. The thermal management system control method for a sodium-ion energy storage battery according to claim 1, characterized in that, Also includes: If the target temperature for correction is determined to be lower than the lower limit of the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target time is set to the lower limit of the lower temperature. If the target temperature is determined to be greater than the upper limit of the preset temperature control range, the target temperature of the sodium-ion energy storage battery at the second target time is set as the upper limit of the temperature.

5. The thermal management system control method for a sodium-ion energy storage battery according to claim 1, characterized in that, Also includes: The sodium-ion energy storage battery is configured to be at a preset rated temperature; The target temperature of the sodium-ion energy storage battery is set to the preset lower limit of the temperature. Monitor the surface temperature of the sodium-ion energy storage battery and determine the target time delay for the surface temperature to drop from a preset rated temperature to a preset lower limit. The thermal conduction delay coefficient of the sodium-ion energy storage battery is determined based on the preset rated temperature, the preset lower limit of temperature, and the target time delay. Based on the preset temperature accuracy threshold and the heat conduction delay coefficient, the timing of the thermal management system's temperature prediction for the sodium-ion energy storage battery is determined.

6. The thermal management system control method for a sodium-ion energy storage battery according to claim 2, characterized in that, Based on the change in heat dissipation within the i-th time cycle, the height of the sodium-ion energy storage battery, the battery's thermal conductivity, and the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system, the temperature change of the sodium-ion energy storage battery within the i-th time cycle after the current moment is determined, including: Using formulas Calculate the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment; where, This indicates the height of the sodium-ion energy storage battery. This represents the change in heat dissipation of the sodium-ion energy storage battery during the i-th time cycle after the current moment. This indicates the contact area between the sodium-ion energy storage battery and the liquid-cooled base plate in the thermal management system. This represents the thermal conductivity of the sodium-ion energy storage battery. This represents the temperature change of the sodium-ion energy storage battery during the i-th time cycle after the current moment.

7. A thermal management system control device for a sodium-ion energy storage battery, characterized in that, include: The acquisition module is used to acquire the power curve, battery state-of-energy-voltage curve, current operating voltage, power, and temperature of the sodium-ion energy storage battery. The first determining module is used to determine, based on the power curve, the battery energy state-voltage curve, the current operating voltage and power, all temperature changes of the sodium-ion energy storage battery within the first to Mth time cycles after the current moment, and obtain a set of temperature changes. The second determining module is used to determine the temperature of the sodium-ion energy storage battery at a first target time based on the set of temperature changes and the temperature of the sodium-ion energy storage battery at the current time; wherein, the first target time represents the time after the current time is delayed by M time ticks; The third determining module is used to determine the pre-adjustment temperature difference based on the difference between the temperature at the first target time and the preset temperature control limit when the temperature at the first target time exceeds the preset temperature control range of the thermal management system of the sodium-ion energy storage battery. The fourth determining module is used to determine the corrected target temperature of the sodium-ion energy storage battery at the second target time based on the current temperature, the first temperature change, and the pre-adjusted temperature difference; wherein, the first temperature change represents the temperature change of the sodium-ion energy storage battery within the first time cycle after the current time; the second target time represents the time after a delay of one time cycle from the current time; the formula for the corrected target temperature of the sodium-ion energy storage battery at the second target time is expressed as: ;in, This indicates the corrected target temperature at the second target time. This indicates that the temperature difference is adjusted in advance. This indicates the sodium-ion energy storage battery at the current moment. temperature, Indicates the first temperature change; The first configuration module is used to configure the target temperature of the sodium-ion energy storage battery at the second target time as the corrected target temperature when it is determined that the corrected target temperature is within the preset temperature control range. The device is also used to: when the temperature at the first target time is determined to be within the preset temperature control range, determine whether the preset phase transition voltage is within the voltage range formed by the working voltage at the first target time and the working voltage at the third target time, or whether the working voltage at the first target time is equal to the preset rated voltage; wherein, the preset phase transition voltage represents the voltage at which the positive electrode material of the battery undergoes a phase transition; the third target time represents the time after a delay of M-1 time cycles from the current time; if yes, then based on the temperature at the current time and the first temperature change, configure the target temperature of the sodium-ion energy storage battery at the second target time; if no, then determine whether the temperature of the sodium-ion energy storage battery at a time after a delay of M+1 time cycles from the current time is within the preset temperature control range.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the thermal management system control method for the sodium-ion energy storage battery as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the thermal management system control method for the sodium-ion energy storage battery as described in any one of claims 1 to 6.

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