Method, device and equipment for estimating state of charge of sodium-ion battery

Abstract

The invention belongs to the technical field of battery energy storage, and particularly relates to a method, a device and equipment for estimating the state of charge of a sodium-ion battery. The method comprises the following steps: acquiring the temperature and charging and discharging current data of the sodium ion battery in real time; respectively correcting the battery capacity and the charge-discharge efficiency of the sodium ion battery in real time based on the temperature; and estimating the state of charge of the sodium-ion battery by combining the corrected battery capacity and the corrected charge-discharge efficiency. The invention provides an estimation scheme of the state of charge of the sodium ion battery, which is suitable for various working conditions and is more accurate and reliable.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of sodium-ion battery energy storage, and particularly relates to a method, device, and equipment for estimating the state of charge of a sodium-ion battery. Background Art

[0002] As an energy storage device with high safety and good environmental friendliness, sodium-ion batteries have gradually attracted more and more attention and applications in recent years, replacing lithium-ion batteries.

[0003] The accurate estimation of the state of charge (SOC) is crucial for the safe use of batteries. The industry generally uses the current integration method for SOC estimation. The current integration method calculates the SOC value of the battery by integrating the charge and discharge current of the battery and combining the capacity and charge and discharge efficiency of the battery.

[0004] At present, the SOC estimation method is mainly based on the design of lithium-ion batteries. However, sodium-ion batteries have more complex temperature-dependent characteristics compared to lithium-ion batteries. The battery capacity and charge and discharge efficiency of sodium-ion batteries vary greatly with temperature. And the current SOC estimation methods based on the design of lithium-ion batteries either do not compensate for the temperature dependence of the battery capacity and charge and discharge efficiency or only compensate for a single factor, and the compensation parameters are determined for lithium-ion batteries without optimization for sodium-ion batteries. Summary of the Invention

[0005] Embodiments of the present disclosure propose an estimation scheme for the state of charge of a sodium-ion battery to solve the problem that the current estimation method of the state of charge of the battery is inaccurate and unreliable when applied to sodium-ion batteries because it has not been optimized for sodium-ion batteries.

[0006] The first aspect of the embodiments of the present disclosure provides a method for estimating the state of charge of a sodium-ion battery, including:

[0007] Real-time acquiring temperature and charge and discharge current data of the sodium-ion battery;

[0008] Based on the temperature, respectively and real-time correcting the battery capacity and charge and discharge efficiency of the sodium-ion battery;

[0009] Combining the corrected battery capacity and the charge and discharge efficiency to estimate the state of charge of the sodium-ion battery.

[0010] In some embodiments of the present disclosure, the real-time acquiring temperature and charge and discharge current data of the sodium-ion battery includes:

[0011] Real-time monitoring the operating temperature of the battery through a high-precision temperature sensor;

[0012] Obtain the charging and discharging current of the battery in real time through a current sensor.

[0013] In some embodiments of the present disclosure, the real-time correction of the battery capacity of the sodium-ion battery based on the temperature includes:

[0014] Determine in real time a temperature correction coefficient corresponding to the temperature based on the temperature, wherein the temperature correction coefficient is predetermined based on the sodium-ion battery;

[0015] Perform real-time correction of the battery capacity of the sodium-ion battery based on the temperature and the temperature correction coefficient.

[0016] In some embodiments of the present disclosure, the real-time correction of the battery capacity of the sodium-ion battery based on the temperature and the temperature correction coefficient includes:

[0017] Perform real-time correction of the battery capacity of the sodium-ion battery based on the temperature and the temperature correction coefficient according to the following formula:

[0018] C real (T) = C nom ·(1 + k T ·(T - T ref ))

[0019] Wherein, (C real (T)) is the actual battery capacity after temperature correction, (C nom ) is the nominal capacity of the battery, (T) is the current battery temperature, (T ref ) is the reference temperature, and (k T ) is the temperature correction coefficient of the sodium-ion battery at the current temperature.

[0020] In some embodiments of the present disclosure, the real-time correction of the charge and discharge efficiency of the sodium-ion battery based on the temperature includes:

[0021] Determine in real time an efficiency temperature coefficient corresponding to the temperature based on the temperature, wherein the efficiency temperature coefficient is predetermined based on the sodium-ion battery;

[0022] Perform real-time correction of the charge and discharge efficiency of the sodium-ion battery based on the temperature and the efficiency temperature coefficient.

[0023] In some embodiments of the present disclosure, the real-time correction of the charge and discharge efficiency of the sodium-ion battery based on the temperature and the efficiency temperature coefficient includes:

[0024] Perform real-time correction of the charge and discharge efficiency of the sodium-ion battery based on the temperature and the efficiency temperature coefficient according to the following formula:

[0025] η(T) = η0·(1 + k η ·(T - Tref )) Among them, (η(T)) is the charge-discharge efficiency after temperature correction, (η0) is the charge-discharge efficiency at the reference temperature, and (k η ) is the efficiency temperature coefficient of the sodium-ion battery, and (T) is the current battery temperature.

[0026] In some embodiments of the present disclosure, estimating the state of charge of the sodium-ion battery by combining the corrected battery capacity and the charge-discharge efficiency includes:

[0027] Integrating the charge-discharge current data, and estimating the state of charge of the sodium-ion battery by combining the corrected battery capacity and the charge-discharge efficiency.

[0028] In some embodiments of the present disclosure, the integrating the charge-discharge current data and estimating the state of charge of the sodium-ion battery by combining the corrected battery capacity and the charge-discharge efficiency includes:

[0029] Integrating the charge-discharge current data according to the following formula, and estimating the state of charge of the sodium-ion battery by combining the corrected battery capacity and the charge-discharge efficiency:

[0030]

[0031] Among them, (SOC0) is the initial state of charge of the sodium-ion battery, (I(τ)) is the charge-discharge current data of the sodium-ion battery at time (τ), (τ(T(τ))) is the charge-discharge efficiency of the sodium-ion battery after temperature correction at time (τ), and (C real (T(τ))) is the battery capacity of the sodium-ion battery after temperature correction at time (τ).

[0032] The second aspect of the embodiments of the present disclosure provides an estimation device for the state of charge of a sodium-ion battery, including:

[0033] An acquisition module, configured to acquire the temperature and charge-discharge current data of the sodium-ion battery in real time;

[0034] A correction module, configured to perform real-time correction on the battery capacity and charge-discharge efficiency of the sodium-ion battery based on the temperature respectively;

[0035] An estimation module, configured to estimate the state of charge of the sodium-ion battery by combining the corrected battery capacity and the charge-discharge efficiency.

[0036] The third aspect of the embodiments of the present disclosure provides an estimation device for the state of charge of a sodium-ion battery, including a memory and a processor,

[0037] The memory is used to store a computer program;

[0038] The processor is configured to implement the method described in the first aspect of the present disclosure when executing the computer program.

[0039] In summary, the methods, devices, and equipment for estimating the state of charge of a sodium-ion battery provided by the embodiments of the present disclosure dynamically adjust the temperature correction coefficient of the battery capacity and the efficiency temperature coefficient of the charge and discharge efficiency of the sodium-ion battery according to the real-time battery temperature, so as to dynamically compensate the battery capacity and the charge and discharge efficiency of the sodium-ion battery based on temperature, and jointly compensate the SOC estimation deviation under different working conditions by the dynamic compensation of the battery capacity and the charge and discharge efficiency, ensuring that the accuracy of the SOC estimation of the sodium-ion battery does not show a significant deviation in various working environments, delaying battery aging, and improving energy management efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The features and advantages of the present disclosure will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as limiting the present disclosure in any way. In the drawings:

[0041] Figure 1 is the overall framework diagram of the method for estimating the state of charge of a sodium-ion battery based on current and temperature compensation shown in the present disclosure;

[0042] Figure 2 is the flowchart of a method for estimating the state of charge of a sodium-ion battery according to some embodiments of the present disclosure;

[0043] Figure 3 is Figure 1 the flowchart of the compensation of temperature for the battery capacity in the method for estimating the state of charge of a sodium-ion battery based on current and temperature compensation shown;

[0044] Figure 4 is Figure 1 the flowchart of the compensation of temperature for the charge and discharge efficiency of sodium ions in the method for estimating the state of charge of a sodium-ion battery based on current and temperature compensation shown;

[0045] Figure 5 is Figure 1 the flowchart of the calculation of the state of charge in the method for estimating the state of charge of a sodium-ion battery based on current and temperature compensation shown;

[0046] Figure 6 is the schematic diagram of a device for estimating the state of charge of a sodium-ion battery according to some embodiments of the present disclosure;

[0047] Figure 7 is the schematic diagram of a device for estimating the state of charge of a sodium-ion battery according to some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] In the following detailed description, numerous specific details of the present disclosure are set forth by way of example in order to provide a thorough understanding of the relevant disclosure. However, it will be apparent to those of ordinary skill in the art that the present disclosure may be practiced without these details. It should be understood that the terms "system", "device", "unit" and / or "module" used in the present disclosure are a means for distinguishing different components, elements, parts or assemblies at different levels in a sequential arrangement. However, these terms may be replaced by other expressions if other expressions can achieve the same purpose.

[0049] It should be understood that when a device, unit or module is referred to as being "on", "connected to" or "coupled to" another device, unit or module, it may be directly on, connected to or coupled to or communicate with the other device, unit or module, or there may be intermediate devices, units or modules, unless the context clearly dictates otherwise. For example, the term "and / or" used in the present disclosure includes any and all combinations of one or more of the associated listed items.

[0050] The terms used in the present disclosure are only for describing specific embodiments and are not intended to limit the scope of the present disclosure. As shown in the specification and claims of the present disclosure, unless the context clearly dictates otherwise, the words "a", "an", "one" and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the specifically identified features, wholes, steps, operations, elements and / or components, and such expressions do not constitute an exclusive listing, and other features, wholes, steps, operations, elements and / or components may also be included.

[0051] Referring to the following description and the accompanying drawings, these or other features and characteristics of the present disclosure, the operating methods, the functions of the relevant elements of the structure, the combination of parts, and the economy of manufacture can be better understood, wherein the description and the drawings form a part of the specification. However, it should be clearly understood that the drawings are only for the purpose of illustration and description and are not intended to limit the scope of protection of the present disclosure. It can be understood that the drawings are not drawn to scale.

[0052] In the present disclosure, a variety of structure diagrams are used to illustrate various deformations according to the embodiments of the present disclosure. It should be understood that the foregoing or following structures are not used to limit the present disclosure. The scope of protection of the present disclosure is defined by the claims.

[0053] With the rapid development of renewable energy and electric vehicles, sodium-ion batteries, as an energy storage device with high safety and good environmental friendliness, have received extensive attention and applications. During the use of sodium-ion batteries, the accurate estimation of SOC plays a crucial role in the safety, performance optimization and battery life of the batteries.

[0054] However, the current SOC estimation methods for sodium-ion batteries are mainly based on the design of lithium-ion batteries. However, sodium-ion batteries have more complex temperature-dependent characteristics compared to lithium-ion batteries. The battery capacity and charge-discharge efficiency of sodium-ion batteries vary significantly with temperature. At present, the SOC estimation methods based on the design of lithium-ion batteries either do not compensate for the changes in battery capacity and charge-discharge efficiency with temperature, or only compensate for a single factor, and the compensation parameters are determined for lithium-ion batteries without optimization for sodium-ion batteries. Therefore, when applying the current SOC estimation methods based on the design of lithium-ion batteries to the SOC estimation of sodium-ion batteries, the following problems will occur:

[0055] 1. A significant decrease in estimation accuracy: At low temperatures, the charge-discharge efficiency of sodium-ion batteries will decrease significantly. If only the capacity is compensated while ignoring the efficiency, the actual available energy will be overestimated in the SOC calculation (for example, when the efficiency decreases at low temperatures, the actual discharge amount decreases, but the single-factor compensation does not correct this deviation).

[0056] 2. Accelerated battery aging: Frequent shallow charging and discharging or deep charging and discharging caused by estimation errors will accelerate the chemical side reactions of the battery and shorten the cycle life.

[0057] 3. Failure in extreme environments: At high temperatures, the superposition of battery capacity attenuation and efficiency loss cannot be corrected simultaneously by single-factor compensation, resulting in a significant deviation between the SOC estimation value and the true value, which may lead to the risk of overcharging or over-discharging.

[0058] 4. Inefficient energy management: When the battery efficiency decreases at low temperatures, if the efficiency is not compensated, the battery management system may misallocate the charge-discharge power, resulting in energy waste or insufficient system power supply.

[0059] 5. The coupling effect is not captured: Temperature changes may affect both the capacity and efficiency simultaneously (such as low temperature reducing both the capacity and efficiency). Single-factor compensation only corrects one of them and cannot reflect the multiple coupling effects, resulting in an increase in the deviation between the model and the actual situation.

[0060] To solve the above problems, the present disclosure proposes an estimation method for the state of charge of a sodium-ion battery based on current and temperature compensation. By combining real-time temperature and current information, the accuracy of SOC estimation is improved through refined compensation, especially in low-temperature or high-temperature environments. The overall framework of the estimation method for the state of charge of a sodium-ion battery based on current and temperature compensation shown in the present disclosure is as Figure 1 shown. In some embodiments, the flowchart of the estimation method for the state of charge of a sodium-ion battery is as Figure 2 shown, and specifically includes the following steps:

[0061] S210, obtain the temperature and charge-discharge current data of the sodium-ion battery in real time.

[0062] Preferably, the working temperature of the battery is monitored in real time by a high-precision temperature sensor; the charging and discharging current of the battery is obtained in real time by a current sensor.

[0063] S220, based on the temperature, the battery capacity and the charge and discharge efficiency of the sodium-ion battery are corrected in real time respectively.

[0064] First, based on the temperature, the battery capacity of the sodium-ion battery is corrected in real time.

[0065] The capacity of the sodium-ion battery will change at different temperatures. Especially in low-temperature or high-temperature environments, the available capacity of the battery usually decreases. In order to accurately estimate the SOC, temperature compensation for the battery capacity is required.

[0066] Specifically:

[0067] First, based on experimental data or the electrochemical model of the battery, determine the temperature correction coefficient (k T ) of the battery capacity of the sodium-ion battery, which can reflect the influence of different temperatures on the battery capacity of the sodium-ion battery.

[0068] Then, based on the correction formula of the battery capacity with respect to temperature, compensate the battery capacity of the sodium-ion battery based on temperature:

[0069] C real (T)=C nom ·(1 + k T ·(T - T ref ))

[0070] Among them, (C real (T)) is the actual battery capacity after temperature correction, (C nom ) is the nominal capacity of the battery, (T) is the current battery temperature, (T ref ) is the reference temperature, and (k T ) is the temperature correction coefficient. Through this formula, the battery capacity of the sodium-ion battery is adjusted in real time with the change of temperature, so as to ensure a more accurate estimation of the SOC of the sodium-ion battery.

[0071] In some embodiments of the present disclosure, the compensation process of the temperature for the battery capacity of the sodium-ion battery is as Figure 3 shown.

[0072] Then, based on the temperature, the charge and discharge efficiency of the sodium-ion battery is corrected in real time.

[0073] Temperature also has a significant impact on the charge and discharge efficiency of sodium-ion batteries. Generally, the efficiency of the battery is relatively low at low temperatures, while it may be relatively high at appropriate high temperatures. However, excessively high temperatures may cause heat loss and reduce efficiency. Therefore, it is necessary to compensate for the impact of temperature on the charge and discharge efficiency.

[0074] Specifically, first, based on experimental data or the electrochemical model of the battery, determine the temperature coefficient of efficiency (k η ) of the sodium-ion battery. This coefficient can reflect the impact of different temperatures on the charge and discharge efficiency of the sodium-ion battery.

[0075] Then, based on the correction formula of the battery charge and discharge efficiency with respect to temperature, compensate the charge and discharge efficiency of the sodium-ion battery based on temperature:

[0076] η(T) = η0·(1 + k η ·(T - T ref )) where (η(T)) is the charge and discharge efficiency after temperature correction, (η0) is the charge and discharge efficiency at the reference temperature, (k η ) is the temperature coefficient of efficiency, and (T) is the current battery temperature.

[0077] In some embodiments of the present disclosure, the compensation process of temperature for the charge and discharge efficiency of sodium ions is as Figure 4 shown.

[0078] Through this formula, the efficiency deviation caused by temperature changes can be compensated, thereby improving the accuracy of SOC estimation.

[0079] S230, Estimate the state of charge of the sodium-ion battery by combining the corrected battery capacity and the charge and discharge efficiency.

[0080] In some embodiments of the present disclosure, the current integration method (Coulomb counting method) is used to calculate the SOC value of the battery by integrating the charge and discharge current of the battery and combining the capacity and efficiency of the battery. The specific formula is as follows:

[0081]

[0082] where (SOC0) is the initial SOC, (I(τ)) is the current of the battery at time (τ), (η(T(τ))) is the charge and discharge efficiency after temperature correction at time (τ), and (C real (T(τ))) is the battery capacity after temperature correction at time (τ).

[0083] By integrating the current data and combining the capacity and efficiency after temperature correction, the SOC value of the battery at any time can be accurately estimated.

[0084] In some embodiments of the present disclosure, the calculation flowchart of the state of charge of a sodium-ion battery based on current and temperature compensation is as Figure 5 shown.

[0085] By adopting a multi-factor compensation model and introducing the dual effects of temperature on capacity (C real (T(τ))) and efficiency (η(T(τ))) into the integration process simultaneously, the estimation accuracy can be effectively improved, battery aging can be delayed, the estimation work in extreme environments can be ensured, and the energy management efficiency can be improved.

[0086] Figure 6 FIG. is a schematic diagram of an estimation device for the state of charge of a sodium-ion battery according to some embodiments of the present disclosure. As Figure 6 shown, the estimation device 600 for the state of charge of the sodium-ion battery includes an acquisition module 610, a correction module 620, and an estimation module 630. Among them:

[0087] The acquisition module 610 is configured to acquire the temperature and charge-discharge current data of the sodium-ion battery in real time;

[0088] The correction module 620 is configured to perform real-time correction on the battery capacity and charge-discharge efficiency of the sodium-ion battery based on the temperature;

[0089] The estimation module 630 is configured to estimate the state of charge of the sodium-ion battery by combining the corrected battery capacity and the charge-discharge efficiency.

[0090] Figure 7 FIG. is a schematic diagram of an estimation device for the state of charge of a sodium-ion battery according to some embodiments of the present disclosure. As Figure 7 shown, the estimation device 700 for the state of charge of the sodium-ion battery includes a memory 720 and a processor 710. The memory 720 is configured to store a computer program; the processor 710 is configured to implement Figure 2 the method for estimating the state of charge of the sodium-ion battery described in S210-S230 in

[0091] In summary, the method, device, and equipment for estimating the state of charge of a sodium-ion battery provided in the embodiments of the present disclosure can dynamically adjust the temperature correction coefficient of the battery capacity and the efficiency temperature coefficient of the charge-discharge efficiency of the sodium-ion battery according to the real-time battery temperature, thereby dynamically compensating the battery capacity and charge-discharge efficiency of the sodium-ion battery based on the temperature, and jointly compensating the SOC estimation deviation under different working conditions by the battery capacity and charge-discharge efficiency, ensuring that the accuracy of the sodium-ion battery SOC estimation does not show a significant deviation in various working environments, delaying battery aging, and improving the energy management efficiency.

[0092] Although the subject matter described herein is provided in the general context of executing in conjunction with the execution of an operating system and applications on a computer system, those skilled in the art will recognize that other implementations may also be performed in conjunction with other types of program modules. In general, program modules include routines, programs, components, data structures, and other types of structures that perform particular tasks or implement particular abstract data types. Those skilled in the art will understand that the subject matter described herein may be practiced using other computer system configurations, including handheld devices, multiprocessor systems, microprocessor-based or programmable consumer electronics, minicomputers, mainframe computers, etc., and may also be used in a distributed computing environment where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in both local and remote memory storage devices.

[0093] Ordinary skilled artisans will appreciate that the units and method steps of the examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this disclosure.

[0094] It should be understood that the above specific embodiments of the present disclosure are only for illustrative explanation of the principles of the present disclosure and do not constitute a limitation to the present disclosure. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present disclosure shall be included within the protection scope of the present disclosure. In addition, the appended claims of the present disclosure are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A method for estimating the state of charge of a sodium ion battery, characterized in that: include: Real-time acquisition of temperature and charge / discharge current data of sodium-ion batteries; Based on the temperature, the battery capacity and the charge and discharge efficiency of the sodium ion battery are respectively corrected in real time; The state of charge of the sodium ion battery is estimated by combining the corrected battery capacity and the charge and discharge efficiency.

2. The method according to claim 1, characterized in that: The real-time acquisition of the temperature and charge / discharge current data of the sodium ion battery comprises: Real-time monitoring of the battery's operating temperature through a high-precision temperature sensor; The battery charging and discharging current is obtained in real time through the current sensor.

3. The method according to claim 1, characterized in that: The real-time correction of the battery capacity of the sodium ion battery based on the temperature includes: Determining in real time a temperature correction coefficient corresponding to the temperature based on the temperature, wherein the temperature correction coefficient is predetermined based on a sodium ion battery; The battery capacity of the sodium ion battery is corrected in real time based on the temperature and the temperature correction coefficient.

4. The method according to claim 3, characterized in that: The real-time correction of the battery capacity of the sodium ion battery based on the temperature and the temperature correction coefficient includes: The battery capacity of the sodium ion battery is corrected in real time based on the temperature and the temperature correction coefficient according to the following formula: C real (T)=C nom ·(1+k T ·(T-T ref )) Among them, (C real (T)) is the actual battery capacity after temperature correction, (C nom ) is the nominal capacity of the battery, (T) is the current battery temperature, (T ref ) is the reference temperature, (k T ) is the temperature correction coefficient of the sodium ion battery at the current temperature.

5. The method according to claim 1, characterized in that: The real-time correction of the charge and discharge efficiency of the sodium ion battery based on the temperature includes: determining in real time an efficiency temperature coefficient corresponding to the temperature based on the temperature, wherein the efficiency temperature coefficient is predetermined based on a sodium ion battery; The charge and discharge efficiency of the sodium ion battery is corrected in real time based on the temperature and the efficiency temperature coefficient.

6. The method according to claim 5, characterized in that: The real-time correction of the charge and discharge efficiency of the sodium ion battery based on the temperature and the efficiency temperature coefficient includes: The charge and discharge efficiency of the sodium ion battery is corrected in real time based on the temperature and the efficiency temperature coefficient according to the following formula: η(T)=η0·(1+k η ·(TT ref )) Among them, (η(T)) is the charge and discharge efficiency after temperature correction, (η0) is the charge and discharge efficiency at the reference temperature, (k η ) is the efficiency temperature coefficient of the sodium-ion battery, and (T) is the current battery temperature.

7. The method according to claim 1, characterized in that: The combined corrected battery capacity and the charge and discharge efficiency to estimate the state of charge of the sodium ion battery includes: The charge and discharge current data are integrated, and the corrected battery capacity and the charge and discharge efficiency are combined to estimate the state of charge of the sodium ion battery.

8. The method according to claim 7, characterized in that: The step of integrating the charge and discharge current data and estimating the state of charge of the sodium ion battery by combining the corrected battery capacity and the charge and discharge efficiency comprises: The charge and discharge current data are integrated according to the following formula, and the state of charge of the sodium ion battery is estimated by combining the corrected battery capacity and the charge and discharge efficiency: Among them, (SOC0) is the initial state of charge of the sodium ion battery, (I(τ)) is the charge and discharge current data of the sodium ion battery at time (τ), (η(T(τ))) is the temperature-corrected charge and discharge efficiency of the sodium ion battery at time (τ), (C real (T(τ))) is the battery capacity of the sodium ion battery after temperature correction at time (τ).

9. A device for estimating the state of charge of a sodium ion battery, characterized in that: include: An acquisition module is used to obtain temperature and charge and discharge current data of the sodium ion battery in real time; A correction module, used to respectively correct the battery capacity and the charge and discharge efficiency of the sodium ion battery in real time based on the temperature; The estimation module is used to estimate the state of charge of the sodium ion battery by combining the corrected battery capacity and the charge and discharge efficiency.

10. A sodium ion battery state of charge estimation device, characterized in that: including memory and processor, The memory is used to store computer programs; The processor is configured to implement the method according to any one of claims 1-8 when executing the computer program.

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