Charging and discharging control method, device and equipment for energy storage system

Abstract

The invention provides a charging and discharging control method, device and equipment for an energy storage system, the energy storage system comprises a plurality of energy storage battery assemblies, the method comprises the following steps: obtaining characteristic parameters of the plurality of energy storage battery assemblies, the characteristic parameters comprising a battery capacity real-time value, a battery capacity rated value, a battery internal resistance calibration value and a battery internal resistance real-time value; determining the health state index of each energy storage battery assembly by using the health state index relationship and the characteristic parameters; comparing the health state index of each energy storage battery assembly with a preset battery health degree threshold value; the charging and discharging states of the energy storage battery assemblies are controlled on the basis of the comparison result, the health state index of each energy storage battery assembly is determined through the real-time characteristic parameters, and then the charging and discharging states of the energy storage battery assemblies are controlled in different control modes on the basis of the comparison result with the preset battery health degree threshold value. The rationality of charge and discharge control is improved, the charge and discharge safety is ensured, and the service life of the energy storage battery assembly is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of charging control technology, and in particular to a method, device and equipment for controlling charging and discharging of an energy storage system. Background Art

[0002] The energy storage battery control process is related to many factors, such as battery capacity, rated voltage, rated current, charge and discharge rate, state of charge, battery health status, energy conversion efficiency, and battery internal temperature. The existing energy storage battery monitoring process mostly uses capacitance, voltage, state of charge and battery temperature to obtain the battery status based on the above parameters, and then perform charge and discharge control.

[0003] However, the above monitoring parameters are unable to accurately grasp the precise operating status information of the energy storage battery assembly, resulting in unreasonable control over the charge and discharge of the energy storage battery assembly, thereby affecting the safety and service life of the energy storage battery assembly. Summary of the invention

[0004] The present invention provides a method, device and equipment for controlling charge and discharge of an energy storage system, which are used to solve the defect in the prior art that the charge and discharge control of an energy storage battery assembly is unreasonable, resulting in the impact on the safety and service life of the energy storage battery assembly.

[0005] In a first aspect, the present invention provides a method for controlling charging and discharging of an energy storage system, wherein the energy storage system includes a plurality of energy storage battery assemblies, and the method includes:

[0006] Acquire characteristic parameters of multiple energy storage battery assemblies, wherein the characteristic parameters include a real-time value of battery capacity, a rated value of battery capacity, a calibrated value of battery internal resistance, and a real-time value of battery internal resistance;

[0007] Determine the health status index of each of the energy storage battery assemblies by using the health status index relationship, combining the real-time value of the battery capacity, the rated value of the battery capacity, the calibrated value of the battery internal resistance and the real-time value of the battery internal resistance;

[0008] Comparing the health status index of each of the energy storage battery assemblies with a preset battery health threshold value respectively;

[0009] Based on the comparison result, the charge and discharge state of the energy storage battery assembly is controlled.

[0010] According to a method for controlling charging and discharging of an energy storage system provided by the present invention, the charging and discharging state of the energy storage battery assembly is controlled based on the comparison result, including:

[0011] Dividing the preset battery health threshold into a first interval, a second interval, a third interval and a fourth interval;

[0012] When the health status index of the energy storage battery assembly is in the first interval, controlling the energy storage battery assembly to charge and discharge normally;

[0013] When the health status index of the energy storage battery assembly is in the second interval, controlling the energy storage battery assembly to reduce the charge and discharge depth, limit the charge and discharge current extremes, and reduce the charge and discharge rate;

[0014] When the health status index of the energy storage battery assembly is in the third interval, limiting the applicable range of the ambient temperature of the energy storage battery assembly and the applicable range of the internal temperature of the battery;

[0015] When the health status index of the energy storage battery assembly is in the fourth interval, the usage times of the energy storage battery assembly is reduced.

[0016] According to a method for controlling charging and discharging of an energy storage system provided by the present invention, the relationship between the health status index is:

[0017]

[0018] Among them, SOH i is the health status index of the i-th energy storage battery component, κ i1 is the capacity decay weight of the i-th energy storage battery component, Q i_act is the real-time value of the battery capacity of the i-th energy storage battery component, Q i_nom is the battery capacity rating of the i-th energy storage battery assembly, κ i2 is the internal resistance change weight of the i-th energy storage battery component, R i_bol is the battery internal resistance calibration value of the i-th energy storage battery assembly, R i_act is the real-time value of the battery internal resistance of the i-th energy storage battery assembly.

[0019] According to a method for controlling charging and discharging of an energy storage system provided by the present invention, when the characteristic parameter also includes a state parameter function term, the health state index relationship is:

[0020]

[0021] Among them, κ i3 is the state parameter weight of the i-th energy storage battery component, g i (T i ,I i_charge / discharge ) is the state parameter function term of the ith energy storage battery component.

[0022] According to a method for controlling charging and discharging of an energy storage system provided by the present invention, the calculation formula of the state parameter function term of the i-th energy storage battery assembly is:

[0023]

[0024] Among them, T i is the real-time value of the internal temperature of the i-th energy storage battery assembly, I i_charge / discharge is the charge and discharge current value of the i-th energy storage battery component, α i is the temperature influence coefficient of the i-th energy storage battery assembly, T0 is the internal reference operating temperature of the i-th energy storage battery assembly, β i is the current influence coefficient of the i-th energy storage battery component, K i is the constant term corresponding to the i-th energy storage battery component.

[0025] According to a method for controlling charging and discharging of an energy storage system provided by the present invention, when the characteristic parameter also includes an aging mechanism function term, the health status index relationship is:

[0026]

[0027] Among them, κ i4 is the aging mechanism weight of the i-th energy storage battery component, h(N i ,t i ,DOD i ) is the aging mechanism function term of the i-th energy storage battery component.

[0028] According to a method for controlling charging and discharging of an energy storage system provided by the present invention, the calculation formula of the aging mechanism function term of the i-th energy storage battery assembly is:

[0029]

[0030] Among them, N i is the number of charge and discharge cycles of the ith energy storage battery assembly, η and λ are the fitting coefficients of the ith energy storage battery assembly, μ is the attenuation rate of the ith energy storage battery assembly, t i is the usage time of the i-th energy storage battery assembly, j is the charge and discharge times of the i-th energy storage battery assembly, M is the charge and discharge times of the i-th energy storage battery assembly, 1≤j≤M, σ j is the weight coefficient of the jth charge and discharge of the i-th energy storage battery assembly, DOD j is the jth charge-discharge depth value of the ith energy storage battery assembly, and θ is the exponential coefficient of the jth charge-discharge depth of the ith energy storage battery assembly.

[0031] According to a method for controlling charging and discharging of an energy storage system provided by the present invention, when the characteristic parameters include the real-time value of battery capacity, the rated value of battery capacity, the calibrated value of battery internal resistance, the real-time value of battery internal resistance, the state parameter function term and the aging mechanism function term, the calculation formula of the health status index of the energy storage battery assembly is:

[0032]

[0033] In a second aspect, the present invention further provides a charge and discharge control device for an energy storage system, comprising:

[0034] An acquisition module is used to acquire characteristic parameters of multiple energy storage battery assemblies, wherein the characteristic parameters include a real-time value of battery capacity, a rated value of battery capacity, a calibrated value of battery internal resistance, and a real-time value of battery internal resistance;

[0035] A determination module, configured to determine the health status index of each of the energy storage battery assemblies by using the health status index relationship, in combination with the real-time value of the battery capacity, the rated value of the battery capacity, the calibrated value of the battery internal resistance and the real-time value of the battery internal resistance;

[0036] A comparison module, used to compare the health status index of each of the energy storage battery assemblies with a preset battery health threshold value;

[0037] A control module is used to control the charge and discharge state of the energy storage battery assembly based on the comparison result.

[0038] In a third aspect, the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the energy storage system charging and discharging control method described above is implemented.

[0039] In a fourth aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the energy storage system charge and discharge control methods described above.

[0040] In a fifth aspect, the present invention further provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the energy storage system charge and discharge control method as described above is implemented.

[0041] The present invention provides a method, device and equipment for controlling charging and discharging of an energy storage system. The energy storage system includes a plurality of energy storage battery assemblies. The method includes obtaining characteristic parameters of the plurality of energy storage battery assemblies, wherein the characteristic parameters include a real-time value of battery capacity, a rated value of battery capacity, a calibrated value of battery internal resistance and a real-time value of battery internal resistance; determining the health status index of each energy storage battery assembly by using a health status index relationship in combination with the real-time value of battery capacity, the rated value of battery capacity, the calibrated value of battery internal resistance and the real-time value of battery internal resistance; comparing the health status index of each energy storage battery assembly with a preset battery health threshold value respectively; and controlling the charging and discharging state of the energy storage battery assembly based on the comparison result. Since the health status index of each energy storage battery assembly is determined by the real-time characteristic parameters, and then based on the comparison result with the preset battery health threshold value, different control modes are used to control the charging and discharging state of the energy storage battery assembly, thereby effectively improving the rationality of charging and discharging control, ensuring charging and discharging safety, and extending the service life of the energy storage battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 is a flow chart of the energy storage system charge and discharge control method provided in this embodiment;

[0044] Figure 2 is a structural schematic diagram of the energy storage system charge and discharge control device provided in this embodiment;

[0045] Figure 3 It is a schematic diagram of the structure of the electronic device provided in this embodiment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Energy storage systems are an important part of power systems and energy management. They can store energy and release it when needed to meet different application requirements. Energy storage systems are devices or technologies that can store electrical energy or other forms of energy. They are used to store energy when there is an oversupply or low demand, and release it when the demand for energy is peak. Energy can be stored during periods of low electricity demand and released during peak periods, thereby balancing the load on the power grid and reducing dependence on traditional power generation resources. By quickly responding to changes in grid demand, energy storage systems help maintain grid frequency stability and enhance the anti-interference ability of power systems. Energy storage systems can store excess electricity generated by renewable energy sources such as wind and solar energy during off-peak hours, reduce wind and solar power abandonment, and improve the utilization rate of new energy.

[0048] When a power grid fails or an unexpected power outage occurs, the energy storage system can quickly provide electricity to ensure the electricity needs of key facilities and residents. These functions of energy storage battery systems are essential for building a more intelligent, efficient and sustainable power grid, especially in the context of the current global energy structure transformation and climate change response. With the advancement of technology and the reduction of costs, energy storage systems will play an increasingly important role in the power system.

[0049] Figure 1 It is a flow chart of the energy storage system charge and discharge control method provided in this embodiment.

[0050] like Figure 1 As shown, the energy storage system charge and discharge control method provided by the embodiment of the present invention, the energy storage system includes multiple energy storage battery components and a control component, the execution subject can be the control component, the control component controls the charge and discharge operation of the energy storage battery component, and the method mainly includes the following steps:

[0051] 101. Acquire characteristic parameters of a plurality of energy storage battery assemblies, wherein the characteristic parameters include a real-time value of battery capacity, a rated value of battery capacity, a calibrated value of battery internal resistance, and a real-time value of battery internal resistance.

[0052] In a specific implementation process, the energy storage system includes multiple energy storage battery components. Therefore, it is necessary to first obtain the characteristic parameters of each energy storage battery component. The characteristic parameters are used to reflect the performance of the energy storage battery from multiple angles, including the real-time value of battery capacity, the rated value of battery capacity, the calibrated value of battery internal resistance, and the real-time value of battery internal resistance, etc. The acquisition method can be through sensor collection or automatic acquisition through specification parameters, as long as the characteristic parameters can be obtained in a timely and accurate manner.

[0053] 102. The health status index of each energy storage battery component is determined by using the health status index relationship, combining the real-time value of the battery capacity, the rated value of the battery capacity, the calibrated value of the battery internal resistance and the real-time value of the battery internal resistance.

[0054] The relationship of health status index is formula (1):

[0055]

[0056] Among them, SOH i is the health status index of the i-th energy storage battery component, κ i1 is the capacity decay weight of the i-th energy storage battery component, Q i_act is the real-time value of the battery capacity of the i-th energy storage battery component, Q i_nom is the battery capacity rating of the i-th energy storage battery assembly, κ i2 is the internal resistance change weight of the i-th energy storage battery component, R i_bol is the battery internal resistance calibration value of the i-th energy storage battery assembly, R i_act is the real-time value of the battery internal resistance of the i-th energy storage battery assembly.

[0057] Therefore, after various characteristic parameters are obtained through the above steps and input into the health status index relationship of formula (1), the health status index of each energy storage battery component can be accurately calculated.

[0058] 103. Compare the health status index of each energy storage battery component with a preset battery health threshold value.

[0059] Since the energy storage system includes multiple energy storage battery components, it is necessary to compare the determined health status index of each energy storage battery component with the preset battery health threshold value and compare the size relationship between the two.

[0060] Among them, the preset battery health threshold is determined in advance through a large amount of experimental data, and the battery health threshold can better reflect the different states of the energy storage battery components.

[0061] 104. Based on the comparison result, control the charge and discharge state of the energy storage battery assembly.

[0062] There are two types of comparison results, one is that the health index of the energy storage battery assembly is greater than or equal to the preset battery health threshold, and the other is that the health index of the energy storage battery assembly is less than the preset battery health threshold. However, in order to better realize the control of the energy storage battery assembly, multiple battery health thresholds can be preset, so that based on the size of different battery health thresholds, the preset battery health threshold is divided into a first interval, a second interval, a third interval and a fourth interval. The connection between different intervals is the battery health threshold. Through the division of four intervals, targeted charging and discharging control can be carried out to better ensure the scientificity and rationality of the control. For example, the first interval is 90%-100%, the second interval is 75%-89%, the third interval is 40%-74%, and the fourth interval is 0%-39%.

[0063] When the health status index of the energy storage battery assembly is in the first interval, the energy storage battery assembly is controlled to charge and discharge normally. The first interval indicates that the performance of the energy storage battery assembly is optimal and can be used normally without special control measures, and only normal monitoring and charging and discharging are required.

[0064] When the health status index of the energy storage battery assembly is in the second interval, the energy storage battery assembly is controlled to reduce the depth of charge and discharge to avoid high current charge and discharge to slow down the aging rate. At the same time, the charge and discharge current extremes are limited and the charge and discharge rate is reduced; the battery is prevented from being subjected to high stress, such as high temperature or deep charge and discharge. In addition, the parameters of the energy storage battery management system (BMS) are updated to adapt to the decline in battery performance and to remind users of changes in battery performance.

[0065] For example, if the battery can be charged and discharged at 100% DOD in a brand new state, when the SOH drops to the second interval, the DOD needs to be limited to 80% or lower. For the charge and discharge rate, if the original battery can withstand a charge and discharge rate of 2C (i.e., a current of twice the rated capacity of the battery), it needs to be reduced to 1C or 0.5C in the second interval. The specific value needs to be determined based on the actual performance of the battery and the above factors. In actual operation, it is necessary to determine the most appropriate charge and discharge depth and rate by gradually adjusting and monitoring the battery's response.

[0066] When the health status index of the energy storage battery assembly is in the third interval, avoid using the battery under extreme conditions, limit the applicable range of the ambient temperature of the energy storage battery assembly and the applicable range of the internal temperature of the battery; such as high or low temperature environments, limit the depth of charge and discharge and current. For example, if an energy storage battery assembly can withstand a charge and discharge current of 100A in a brand new state, when its SOH drops to the third interval, the charge and discharge current needs to be limited to 50A or lower to slow down further aging.

[0067] In addition, the energy storage batteries corresponding to the third interval should avoid extreme temperatures. For example, if the applicable ambient temperature range of the new battery is -20°C to 50°C, the energy storage batteries corresponding to the third interval should be limited to 1°C to 30°C.

[0068] When the health status index of the energy storage battery assembly is in the fourth interval, the number of times the energy storage battery assembly is used is reduced, and the use of the battery needs to be strictly limited, and is only allowed to be used in applications with low power or low energy requirements.

[0069] In this embodiment, the health status index of each energy storage battery assembly is determined by real-time feature parameters, and then based on the comparison result with the preset battery health threshold, different control methods are used to control the charge and discharge status of the energy storage battery assembly, which effectively improves the rationality of the charge and discharge control, ensures the safety of charge and discharge, and prolongs the service life of the energy storage battery assembly.

[0070] Further, based on the above embodiment, the characteristic parameters in this embodiment also include a state parameter function term, and the corresponding health state index relationship is formula (2):

[0071]

[0072] Among them, SOH i is the health status index of the i-th energy storage battery component, κ i1 is the capacity decay weight of the i-th energy storage battery component, Q i_act is the real-time value of the battery capacity of the i-th energy storage battery component, Q i_nom is the battery capacity rating of the i-th energy storage battery assembly, κ i2 is the internal resistance change weight of the i-th energy storage battery component, R i_bol is the battery internal resistance calibration value of the i-th energy storage battery assembly, R i_act is the real-time value of the internal resistance of the i-th energy storage battery assembly, κ i3 is the state parameter weight of the i-th energy storage battery component, g i (T i ,I i_charge / discharge ) is the state parameter function term of the ith energy storage battery component.

[0073] The calculation formula of the state parameter function term of the i-th energy storage battery component is (3):

[0074]

[0075] Among them, T i is the real-time value of the internal temperature of the i-th energy storage battery assembly, I i_charge / discharge is the charge and discharge current value of the i-th energy storage battery component, α i is the temperature influence coefficient of the i-th energy storage battery assembly, T0 is the internal reference operating temperature of the i-th energy storage battery assembly, β i is the current influence coefficient of the i-th energy storage battery component, K i is the constant term corresponding to the i-th energy storage battery component.

[0076] The state parameter function term quantifies the real-time value of the internal temperature T of the energy storage battery component. i and the charge and discharge current value I i_charge / discharge Impact on battery health index, αi is the temperature influence coefficient, which indicates the effect of one unit increase in temperature on performance; β i The current influence coefficient indicates the influence of one unit increase in current on the battery health index; K i is a constant term, which indicates the performance of the energy storage battery assembly under the benchmark state; the internal benchmark operating temperature T0 is a reference temperature, which can usually be set as the optimal operating temperature of the battery; e is the base of the natural logarithm, which is used to create the real-time value of the internal temperature of the energy storage battery assembly T i The effect decays exponentially as the temperature deviates from the internal reference operating temperature T0.

[0077] By adding characteristic parameters of the state parameter function term, the health status index of the energy storage battery component can be further accurately determined, thereby improving the rationality of subsequent charge and discharge control.

[0078] Further, based on the above embodiment, the characteristic parameters in this embodiment also include an aging mechanism function term, and the corresponding health status index relationship is formula (4):

[0079]

[0080] Among them, SOH i is the health status index of the i-th energy storage battery component, κ i1 is the capacity decay weight of the i-th energy storage battery component, Q i_act is the real-time value of the battery capacity of the i-th energy storage battery component, Q i_nom is the battery capacity rating of the i-th energy storage battery assembly, κ i2 is the internal resistance change weight of the i-th energy storage battery component, R i_bol is the battery internal resistance calibration value of the i-th energy storage battery assembly, R i_act is the real-time value of the internal resistance of the i-th energy storage battery assembly, κ i4 is the aging mechanism weight of the i-th energy storage battery component, h(N i ,t i ,DOD i ) is the aging mechanism function term of the i-th energy storage battery component.

[0081] The calculation formula of the aging mechanism function term of the i-th energy storage battery component is (5):

[0082]

[0083] Among them, N i is the number of charge and discharge cycles of the ith energy storage battery assembly, η and λ are the fitting coefficients of the ith energy storage battery assembly, μ is the attenuation rate of the ith energy storage battery assembly, t iis the usage time of the i-th energy storage battery assembly, j is the charge and discharge times of the i-th energy storage battery assembly, M is the charge and discharge times of the i-th energy storage battery assembly, 1≤j≤M, σ j is the weight coefficient of the jth charge and discharge of the i-th energy storage battery assembly, DOD j is the jth charge-discharge depth value of the ith energy storage battery assembly, and θ is the exponential coefficient of the jth charge-discharge depth of the ith energy storage battery assembly.

[0084] Similarly, by adding characteristic parameters of the aging mechanism function term, the determined health status index can be made more accurate, and the controlled charging and discharging of the energy storage battery components can be made more reasonable and scientific.

[0085] Furthermore, in order to maximize the accuracy of the health status index, the characteristic parameters in this embodiment include the real-time value of battery capacity, the rated value of battery capacity, the calibrated value of battery internal resistance, the real-time value of battery internal resistance, the state parameter function term and the aging mechanism function term. The calculation formula of the health status index of the energy storage battery assembly is (6):

[0086]

[0087] Among them, SOH i is the health status index of the i-th energy storage battery component, κ i1 is the capacity decay weight of the i-th energy storage battery component, Q i_act is the real-time value of the battery capacity of the i-th energy storage battery component, Q i_nom is the battery capacity rating of the i-th energy storage battery assembly, κ i2 is the internal resistance change weight of the i-th energy storage battery component, R i_bol is the battery internal resistance calibration value of the i-th energy storage battery assembly, R i_act is the real-time value of the internal resistance of the i-th energy storage battery assembly, κ i3 is the state parameter weight of the i-th energy storage battery component, g i (T i ,I i_charge / discharge ) is the state parameter function term of the i-th energy storage battery component, κ i4 is the aging mechanism weight of the i-th energy storage battery component, h(N i ,t i ,DOD i ) is the aging mechanism function term of the i-th energy storage battery component.

[0088] The health status index determined by multiple characteristic parameters effectively improves the accuracy of the health status index determination, and can accurately obtain the accurate health status of each energy storage battery component in the energy storage system, and formulate corresponding control strategies accordingly, which greatly improves the accuracy of health status monitoring of each energy storage battery component and improves the safety and service life of the energy storage battery components in the energy storage system.

[0089] The present invention detects the characteristic parameters of the energy storage battery in real time, calculates the health status index of each energy storage battery assembly, and determines the corresponding control strategy according to the health status of each energy storage battery assembly, so as to improve the safety and service life of the energy storage battery assembly during operation. For energy storage batteries with too low health status index, they are replaced in time, effectively avoiding the occurrence of safety problems.

[0090] Based on the same general inventive concept, the present invention also protects a charge and discharge control device for an energy storage system. The charge and discharge control device for an energy storage system provided by the present invention is described below. The charge and discharge control device for an energy storage system described below and the charge and discharge control method for an energy storage system described above can be referred to each other.

[0091] Figure 2 It is a structural schematic diagram of the energy storage system charge and discharge control device provided in this embodiment.

[0092] like Figure 2 As shown, this embodiment provides a charge and discharge control device for an energy storage system, comprising:

[0093] An acquisition module 201 is used to acquire characteristic parameters of a plurality of energy storage battery assemblies, wherein the characteristic parameters include a real-time value of battery capacity, a rated value of battery capacity, a calibrated value of battery internal resistance, and a real-time value of battery internal resistance;

[0094] A determination module 202 is used to determine the health status index of each of the energy storage battery assemblies by using the health status index relationship, combining the real-time value of the battery capacity, the rated value of the battery capacity, the calibrated value of the battery internal resistance and the real-time value of the battery internal resistance;

[0095] A comparison module 203 is used to compare the health status index of each energy storage battery assembly with a preset battery health threshold value;

[0096] The control module 204 is used to control the charge and discharge state of the energy storage battery assembly based on the comparison result.

[0097] Figure 3 It is a schematic diagram of the structure of the electronic device provided in this embodiment.

[0098] like Figure 3As shown, the electronic device may include: a processor 310, a communication interface 320, a memory 330 and a communication bus 340, wherein the processor 310, the communication interface 320 and the memory 330 communicate with each other through the communication bus 340. The processor 310 may call the logic instructions in the memory 330 to execute the energy storage system charge and discharge control method, the energy storage system includes a plurality of energy storage battery components, the method includes: obtaining characteristic parameters of a plurality of energy storage battery components, the characteristic parameters include the real-time value of battery capacity, the rated value of battery capacity, the calibrated value of battery internal resistance and the real-time value of battery internal resistance; using the health status index relationship, combining the real-time value of battery capacity, the rated value of battery capacity, the calibrated value of battery internal resistance and the real-time value of battery internal resistance, determining the health status index of each energy storage battery component; respectively comparing the health status index of each energy storage battery component with the preset battery health threshold; and controlling the charge and discharge state of the energy storage battery component based on the result of the comparison.

[0099] In addition, the logic instructions in the above-mentioned memory 330 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0100] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the energy storage system charge and discharge control method provided by the above methods. The energy storage system includes multiple energy storage battery assemblies. The method includes: obtaining characteristic parameters of multiple energy storage battery assemblies, the characteristic parameters include a real-time value of battery capacity, a rated value of battery capacity, a calibrated value of battery internal resistance, and a real-time value of battery internal resistance; using a health status index relationship, combining the real-time value of battery capacity, the rated value of battery capacity, the calibrated value of battery internal resistance, and the real-time value of battery internal resistance, to determine the health status index of each of the energy storage battery assemblies; respectively comparing the health status index of each of the energy storage battery assemblies with a preset battery health threshold; and controlling the charge and discharge state of the energy storage battery assemblies based on the comparison result.

[0101] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the processor executes the energy storage system charge and discharge control method provided by the above methods, the energy storage system includes multiple energy storage battery assemblies, and the method includes: obtaining characteristic parameters of multiple energy storage battery assemblies, the characteristic parameters including a real-time value of battery capacity, a rated value of battery capacity, a calibrated value of battery internal resistance, and a real-time value of battery internal resistance; using a health status index relationship, combining the real-time value of battery capacity, the rated value of battery capacity, the calibrated value of battery internal resistance, and the real-time value of battery internal resistance, to determine the health status index of each of the energy storage battery assemblies; respectively comparing the health status index of each of the energy storage battery assemblies with a preset battery health threshold; and controlling the charge and discharge state of the energy storage battery assemblies based on the comparison result.

[0102] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0103] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling charging and discharging of an energy storage system, characterized in that: The energy storage system includes a plurality of energy storage battery components, and the method includes: Acquire characteristic parameters of multiple energy storage battery assemblies, wherein the characteristic parameters include a real-time value of battery capacity, a rated value of battery capacity, a calibrated value of battery internal resistance, and a real-time value of battery internal resistance; Determine the health status index of each of the energy storage battery assemblies by using the health status index relationship, combining the real-time value of the battery capacity, the rated value of the battery capacity, the calibrated value of the battery internal resistance and the real-time value of the battery internal resistance; Comparing the health status index of each of the energy storage battery assemblies with a preset battery health threshold value respectively; Based on the comparison result, the charge and discharge state of the energy storage battery assembly is controlled.

2. The energy storage system charge and discharge control method according to claim 1, characterized in that: The controlling the charge and discharge state of the energy storage battery assembly based on the comparison result includes: Dividing the preset battery health threshold into a first interval, a second interval, a third interval and a fourth interval; When the health status index of the energy storage battery assembly is in the first interval, controlling the energy storage battery assembly to charge and discharge normally; When the health status index of the energy storage battery assembly is in the second interval, controlling the energy storage battery assembly to reduce the charge and discharge depth, limit the charge and discharge current extremes, and reduce the charge and discharge rate; When the health status index of the energy storage battery assembly is in the third interval, limiting the applicable range of the ambient temperature of the energy storage battery assembly and the applicable range of the internal temperature of the battery; When the health status index of the energy storage battery assembly is in the fourth interval, the usage times of the energy storage battery assembly is reduced.

3. The energy storage system charge and discharge control method according to claim 1, characterized in that: The health status index relationship is: Among them, SOH i is the health status index of the i-th energy storage battery component, κ i1 is the capacity decay weight of the i-th energy storage battery component, Q i_act is the real-time value of the battery capacity of the i-th energy storage battery component, Q i_nom is the battery capacity rating of the i-th energy storage battery assembly, κ i2 is the internal resistance change weight of the i-th energy storage battery component, R i_bol is the battery internal resistance calibration value of the i-th energy storage battery assembly, R i_act is the real-time value of the battery internal resistance of the i-th energy storage battery assembly.

4. The energy storage system charge and discharge control method according to claim 3, characterized in that: When the characteristic parameter also includes a state parameter function term, the health state index relationship is: Among them, κ i3 is the state parameter weight of the i-th energy storage battery component, g i (T i ,I i_charge / discharge ) is the state parameter function term of the ith energy storage battery component.

5. The energy storage system charge and discharge control method according to claim 4, characterized in that: The calculation formula of the state parameter function term of the i-th energy storage battery assembly is: Among them, T i is the real-time value of the internal temperature of the i-th energy storage battery assembly, I i_charge / discharge is the charge and discharge current value of the i-th energy storage battery component, α i is the temperature influence coefficient of the i-th energy storage battery assembly, T0 is the internal reference operating temperature of the i-th energy storage battery assembly, β i is the current influence coefficient of the i-th energy storage battery component, K i is the constant term corresponding to the i-th energy storage battery component.

6. The energy storage system charge and discharge control method according to claim 5, characterized in that: When the characteristic parameter also includes an aging mechanism function term, the health status index relationship is: Among them, κ i4 is the aging mechanism weight of the i-th energy storage battery component, h(N i ,t i ,DOD i ) is the aging mechanism function term of the i-th energy storage battery component.

7. The energy storage system charge and discharge control method according to claim 6, characterized in that: The calculation formula of the aging mechanism function term of the i-th energy storage battery assembly is: Among them, N i is the number of charge and discharge cycles of the ith energy storage battery assembly, η and λ are the fitting coefficients of the ith energy storage battery assembly, μ is the attenuation rate of the ith energy storage battery assembly, t i is the usage time of the i-th energy storage battery assembly, j is the charge and discharge times of the i-th energy storage battery assembly, M is the charge and discharge times of the i-th energy storage battery assembly, 1≤j≤M, σ j is the weight coefficient of the jth charge and discharge of the i-th energy storage battery assembly, DOD j is the jth charge-discharge depth value of the ith energy storage battery assembly, and θ is the exponential coefficient of the jth charge-discharge depth of the ith energy storage battery assembly.

8. The energy storage system charge and discharge control method according to claim 7, characterized in that: When the characteristic parameters include the real-time value of battery capacity, the rated value of battery capacity, the calibrated value of battery internal resistance, the real-time value of battery internal resistance, the state parameter function term and the aging mechanism function term, the calculation formula of the health status index of the energy storage battery assembly is:

9. A charge and discharge control device for an energy storage system, characterized in that: The energy storage system includes multiple energy storage battery components, and the device includes: An acquisition module is used to acquire characteristic parameters of multiple energy storage battery assemblies, wherein the characteristic parameters include a real-time value of battery capacity, a rated value of battery capacity, a calibrated value of battery internal resistance, and a real-time value of battery internal resistance; A determination module, configured to determine the health status index of each of the energy storage battery assemblies by using the health status index relationship, in combination with the real-time value of the battery capacity, the rated value of the battery capacity, the calibrated value of the battery internal resistance and the real-time value of the battery internal resistance; A comparison module, used to compare the health status index of each of the energy storage battery assemblies with a preset battery health threshold value; A control module is used to control the charge and discharge state of the energy storage battery assembly based on the comparison result.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the energy storage system charging and discharging control method as described in any one of claims 1 to 8 is implemented.

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