Method, device, equipment and medium for controlling voltage difference at charging and discharging end of energy storage system

Abstract

The present invention provides a control method, device, equipment and medium for the voltage difference at the end of charge and discharge of an energy storage system, which relates to the technical field of energy storage systems, including: determining the working state of a battery in response to the operation of the energy storage system; the working state includes a charging state and a discharging state; obtaining the current voltage and current of the battery; determining the initial operating current of the battery based on the working state, the current voltage and the current current; controlling the battery to work based on the initial operating current, obtaining the voltage after work and the current after work; adjusting the initial operating current based on the voltage after work and the current after work to obtain a target operating current; controlling the battery to work based on the target operating current until the battery ends work. In this method, the life of the energy storage system is improved by limiting the voltage difference at the end of charge and discharge of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a method, device, equipment and medium for controlling the voltage difference at the charging and discharging ends of an energy storage system. Background Art

[0002] With the development of energy storage systems, the market demand is growing. The emergence of this system not only solves the problem of distribution network in limited land and power capacity resources, but also achieves basic balance between local energy production and energy load through energy storage and optimized configuration. The system can also participate in auxiliary services such as peak and frequency regulation of the power grid, peak shaving and valley filling, and even serve as supporting facilities for the energy Internet, supporting the integrated development of smart grid, smart charging, and smart information network. The longer the energy storage service life, the greater the peak-valley arbitrage benefits, so the requirements for the system cycle life are getting higher and higher.

[0003] The voltage difference at the end of charging and discharging is a major factor that consumes the life of the system. Therefore, how to control the voltage difference at the end of charging and discharging of the energy storage system is an issue that needs to be solved urgently. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a method, device, equipment and medium for controlling the voltage difference at the charging and discharging ends of an energy storage system, so as to increase the life of the energy storage system by limiting the current of the voltage difference at the charging and discharging ends of the system.

[0005] In a first aspect, an embodiment of the present invention provides a method for controlling the voltage difference at the end of charge and discharge of an energy storage system. In response to the operation of the energy storage system, the working state of the battery is determined; the working state includes a charging state and a discharging state; the current voltage and the current current of the battery are obtained; based on the working state, the current voltage and the current current, the initial operating current of the battery is determined; based on the initial operating current, the battery is controlled to operate, and the post-operation voltage and the post-operation current are obtained; based on the post-operation voltage and the post-operation current, the initial operating current is adjusted to obtain a target operating current; based on the target operating current, the battery is controlled to operate until the battery stops operating.

[0006] In a preferred embodiment of the present invention, the above-mentioned determination of the initial operating current of the battery based on the working state, the current voltage and the current current includes: if the working state is a charging state, determining whether the battery is charged and the current is reduced based on the current voltage and a preset charging voltage threshold; the charging voltage threshold is adjusted based on the health of the battery; if charging and the current is reduced, the initial operating current is determined based on the number of times the current voltage meets the charging voltage threshold and the current current.

[0007] In a preferred embodiment of the present invention, the above-mentioned determination of the initial operating current based on the number of times the current voltage satisfies the charging voltage threshold and the current current includes: if the number of times the current voltage satisfies the charging voltage threshold is 1, then when the current current is greater than a preset first current threshold, the initial operating current is the first current threshold; when the current current is less than or equal to the first current threshold, the initial operating current is the current current; if the number of times the current voltage satisfies the charging voltage threshold is greater than 1, then when the current current is greater than a preset second current threshold, the initial operating current is the second current threshold; when the current current is less than or equal to the second current threshold, the initial operating current is the current current; the first current threshold is greater than the second current threshold.

[0008] In a preferred embodiment of the present invention, the above-mentioned initial operating current is adjusted based on the post-working voltage and the post-working current to obtain the target operating current, including: if the post-working voltage meets the charging voltage threshold, the post-working current is compared with a preset third current threshold; if the post-working current is greater than the third current threshold, the initial operating current is adjusted to the third current threshold, and the third current threshold is used as the target operating current; if the post-working current is less than or equal to the third current threshold, the initial operating current is adjusted to the post-working current, and the post-working current is used as the target operating current.

[0009] In a preferred embodiment of the present invention, the above-mentioned determination of the initial operating current based on the number of times the current voltage meets the charging voltage threshold and the current current also includes: if the operating state is a discharge state, determining whether the battery is discharging to reduce the current based on a predetermined battery state of charge and a preset state of charge threshold; if discharging to reduce the current, determining the initial operating current based on the current current and a predetermined fourth current threshold.

[0010] In a preferred embodiment of the present invention, the above-mentioned determination of whether the battery is discharged and current reduced based on a predetermined battery state of charge and a preset state of charge threshold includes: if the battery state of charge is less than the state of charge threshold, determining that the battery is discharged and current reduced; determining the initial operating current based on the current current and a predetermined fourth current threshold, including: if the current current is greater than the fourth current threshold, the initial operating current is the fourth current threshold; if the current current is less than or equal to the fourth current threshold, the initial operating current is the current current.

[0011] In a preferred embodiment of the present invention, the method further comprises: after the initial operating current and the target operating current are determined, adjusting the initial operating current and the target operating current based on the battery state of charge, temperature, and temperature duration of the battery.

[0012] In a second aspect, an embodiment of the present invention further provides a control device for the voltage difference at the end of charge and discharge of an energy storage system, comprising: a working state determination module, used to determine the working state of a battery in response to the operation of the energy storage system; the working state includes a charging state and a discharging state; a voltage and current acquisition module, used to acquire the current voltage and current of the battery; an initial operating current determination module, used to determine the initial operating current of the battery based on the working state, the current voltage and the current current; a working control module, used to control the battery to work based on the initial operating current, and acquire the post-operation voltage and post-operation current; a target operating current determination module, used to adjust the initial operating current based on the post-operation voltage and the post-operation current to obtain a target operating current; and a battery control module, used to control the battery to work based on the target operating current until the battery ends its operation.

[0013] In a third aspect, an embodiment of the present invention further provides an electronic device, including a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the method for controlling the charging and discharging terminal pressure difference of the energy storage system according to the first aspect above.

[0014] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to implement the method for controlling the charge and discharge terminal pressure difference of the energy storage system according to the first aspect above.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] The embodiment of the present invention provides a method, device, equipment and medium for controlling the voltage difference at the end of charge and discharge of an energy storage system. The method determines the working state of the battery in response to the operation of the energy storage system, and the working state includes the charging state and the discharging state. The current voltage and current of the battery are obtained. The initial operating current of the battery is determined based on the working state, the current voltage and the current current. The battery is controlled to work based on the initial operating current. The post-operation voltage and the post-operation current are obtained. The initial operating current is adjusted based on the post-operation voltage and the post-operation current to obtain the target operating current. The battery is controlled to work based on the target operating current until the battery ends its operation. In this method, the life of the energy storage system is improved by limiting the voltage difference at the end of charge and discharge of the system.

[0017] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0018] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A flow chart of a method for controlling the voltage difference at the end of charging and discharging of an energy storage system provided by an embodiment of the present invention;

[0021] Figure 2 A flow chart of another method for controlling the voltage difference at the end of charging and discharging of an energy storage system provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a device for controlling the voltage difference at the end of charging and discharging of an energy storage system provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. 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.

[0025] With the development of energy storage systems, the market demand is growing. The emergence of this system not only solves the problem of distribution network in limited land and power capacity resources, but also achieves basic balance between local energy production and energy load through energy storage and optimized configuration. The system can also participate in auxiliary services such as peak and frequency regulation of the power grid, peak shaving and valley filling, and even serve as supporting facilities for the energy Internet, supporting the integrated development of smart grid, smart charging, and smart information network. The longer the energy storage service life, the greater the peak-valley arbitrage benefits, so the requirements for the system cycle life are getting higher and higher.

[0026] The voltage difference at the end of charging and discharging is a major factor that consumes the life of the system. Therefore, how to control the voltage difference at the end of charging and discharging of the energy storage system is an issue that needs to be solved urgently.

[0027] Based on this, the embodiment of the present invention provides a method, device, equipment and medium for controlling the voltage difference at the end of charge and discharge of an energy storage system. The working state of the battery can be determined in response to the operation of the energy storage system. The working state includes the charging state and the discharging state, and the current voltage and current of the battery are obtained. The initial operating current of the battery is determined based on the working state, the current voltage and the current current, and the battery is controlled to work based on the initial operating current, and the post-operation voltage and the post-operation current are obtained. The initial operating current is adjusted based on the post-operation voltage and the post-operation current to obtain the target operating current, and the battery is controlled to work based on the target operating current until the battery ends its operation. In this method, the life of the energy storage system is improved by limiting the voltage difference at the end of charge and discharge of the system.

[0028] To facilitate understanding of this embodiment, a method for controlling the voltage difference at the charging and discharging ends of an energy storage system disclosed in an embodiment of the present invention is first introduced in detail.

[0029] Example 1

[0030] The embodiment of the present invention provides a method for controlling the voltage difference at the end of charging and discharging of an energy storage system. Figure 1 A flow chart of a method for controlling the voltage difference at the end of charge and discharge of an energy storage system provided by an embodiment of the present invention. Figure 1 As shown, the method for controlling the voltage difference at the end of charge and discharge of the energy storage system may include the following steps:

[0031] Step S101, in response to the operation of the energy storage system, determining the working state of the battery.

[0032] The working state includes a charging state and a discharging state.

[0033] Among them, the energy storage system can be a 2-hour system, that is, the power is twice the power. Under this premise, multiple charging and discharging may lead to insufficient charging and discharging, and it is impossible to fully charge and discharge. Therefore, in order to maintain the consistency of the battery, the energy storage system can be calibrated for multiple times in voltage, and the specific method is to reduce the current. For example, the charging state is charging current reduction, and the discharging state is discharging current reduction.

[0034] Among them, the premise of charging current reduction and discharging current reduction is that the power is greater than 2 times the power, and the discharging current reduction is only used when connected to the grid, and being off the grid may cause overload.

[0035] Step S102, obtaining the current voltage and current of the battery.

[0036] The current voltage and current of the battery are the voltage and current of the battery at the corresponding working state at this moment.

[0037] Step S103, determining the initial operating current of the battery based on the working state, the current voltage and the current current.

[0038] Among them, different working states correspond to different initial operating current determination strategies. For example, in the charging state and charging current reduction, the initial operating current can be determined by the number of times the current voltage meets the charging voltage threshold and the current current; in the discharging state and discharging current reduction, the initial operating current can be determined by the current current and the current threshold.

[0039] The charging voltage threshold may be 3.3V, 3.2V, etc., which are not limited here. The current threshold may be 30A, etc., which are not limited here.

[0040] Step S104, controlling the battery to operate based on the initial operating current, and obtaining the post-operation voltage and post-operation current.

[0041] Among them, after the battery is controlled by the initial operating current, the current voltage and current will change, and the post-operation voltage and the post-operation current are the current voltage and the current current after the battery is controlled by the initial operating current.

[0042] Step S105, adjusting the initial operating current based on the post-operation voltage and the post-operation current to obtain a target operating current.

[0043] Among them, the above-mentioned initial operating current may be the operating current for the first time of current limiting, or it may be the operating current for more than one time of current limiting. In the case of more than one time of current limiting, if this time is the last time, the initial operating current is the target operating current.

[0044] Specifically, the initial operating current is adjusted based on the post-operating voltage and the post-operating current to obtain the target operating current, which may include: if the post-operating voltage meets the charging voltage threshold, the post-operating current is compared with a pre-set third current threshold; if the post-operating current is greater than the third current threshold, the initial operating current is adjusted to the third current threshold, and the third current threshold is used as the target operating current; if the post-operating current is less than or equal to the third current threshold, the initial operating current is adjusted to the post-operating current, and the post-operating current is used as the target operating current.

[0045] Among them, the charging voltage threshold may be 3.3V, and the third current threshold may be 30A.

[0046] For example, when the voltage after operation reaches 3.3V, if the current after operation is greater than 30A, the target operating current is 30A; if the current after operation is less than 30A, such as 20A, the target operating current is 20A.

[0047] Step S106, controlling the battery to operate based on the target operating current until the battery operation is completed.

[0048] Wherein, when the working state is the charging state, the battery is controlled to work according to the target operating current until the voltage meets the preset stop threshold.

[0049] The stop threshold may be 3.65V.

[0050] Among them, when the working state is the discharge state, the battery is controlled to work according to the target operating current until the battery discharge is completed. The end benchmark can be set in advance. For example, the stop discharge power can be set. When the remaining power of the battery reaches this power, the discharge is stopped.

[0051] Further, after the initial operating current and the target operating current are determined, the initial operating current and the target operating current are adjusted based on the battery state of charge, the temperature, and the duration of the temperature of the battery.

[0052] Specifically, if the temperature rises too quickly during the charging and discharging process, continuous high-current charging may damage the battery or be limited by the system power, so the current can be adjusted.

[0053] Among them, in the charging state, when the battery charge state is less than 50% and the temperature is higher than 42°C for more than 5 seconds, the current at this time is 75% of the current current; when the temperature is higher than 44°C for more than 5 seconds, the current at this time is 75% of the current current.

[0054] Among them, in the discharge state, when the battery charge state is greater than 50%, the temperature is higher than 45°C and lasts for more than 5 seconds (the discharge temperature rises, so the temperature judgment condition is lower than the charging temperature), the current at this time is 75% of the current current; when the temperature is higher than 47°C and lasts for more than 5 seconds, the current at this time is 75% of the current current.

[0055] The control method of the voltage difference at the end of charge and discharge of the energy storage system provided in the embodiment of the present invention can determine the working state of the battery in response to the operation of the energy storage system, the working state includes the charging state and the discharging state, obtain the current voltage and current of the battery, determine the initial operating current of the battery based on the working state, the current voltage and the current current, control the battery to work based on the initial operating current, obtain the post-operation voltage and the post-operation current, adjust the initial operating current based on the post-operation voltage and the post-operation current, obtain the target operating current, and control the battery to work based on the target operating current until the battery ends its operation. In this method, the life of the energy storage system is improved by limiting the voltage difference at the end of charge and discharge of the system.

[0056] Example 2

[0057] An embodiment of the present invention also provides another method for controlling the voltage difference at the end of charging and discharging of an energy storage system; this method is implemented on the basis of the method in the above embodiment; this method focuses on describing the specific implementation method of determining the initial operating current of the battery based on the working state, current voltage and current current.

[0058] Figure 2 A flow chart of another method for controlling the voltage difference at the end of charge and discharge of an energy storage system provided by an embodiment of the present invention, such as Figure 2 As shown, the method of determining the initial operating current of the battery based on the working state, the current voltage and the current current may include the following steps:

[0059] Step S201: If the working state is the charging state, determine whether the battery is charged and current reduced based on the current voltage and a preset charging voltage threshold.

[0060] Among them, the charging voltage threshold can be 3.3V. Since the battery has a certain cycle life and attenuation, the battery health will decay year by year. The greater the attenuation, the greater the final terminal voltage difference. Therefore, when the battery health decays to 80%, in order to reduce this terminal voltage difference, its charging voltage threshold can be adjusted to 3.2V.

[0061] Step S202: If charging and current reduction are performed, the initial operating current is determined based on the number of times the current voltage meets the charging voltage threshold and the current current.

[0062] Specifically, determining the initial operating current based on the number of times the current voltage meets the charging voltage threshold and the current current may include the following steps:

[0063] Step A1: if the number of times that the current voltage meets the charging voltage threshold is 1, then when the current current is greater than a preset first current threshold, the initial operating current is the first current threshold.

[0064] Step A2: when the current current is less than or equal to the first current threshold, the initial operating current is the current current.

[0065] The first current threshold may be 70A.

[0066] For example, when the current voltage reaches 3.3V for the first time, if the current current is greater than 70A, the initial operating current is 70A; if the current current is less than or equal to 70A, such as 60A, the initial operating current is 60A.

[0067] Step A3: if the number of times that the current voltage meets the charging voltage threshold is greater than 1, then when the current current is greater than a preset second current threshold, the initial operating current is the second current threshold.

[0068] Step A4: when the current current is less than or equal to the second current threshold, the initial operating current is the current current.

[0069] The first current threshold is greater than the second current threshold.

[0070] The second current threshold may be 30A.

[0071] For example, when the current voltage reaches 3.3V for the second time, if the current current is greater than 30A, the initial operating current is 30A; if the current current is less than or equal to 30A, such as 20A, the initial operating current is 20A.

[0072] It should be noted that the current voltage may reach the charging voltage threshold for the third time or more, but the number of current limiting times when the charging voltage threshold is reached can be set according to actual conditions, and the corresponding current threshold can also be set. The set current threshold can decrease as the number of current limiting times increases.

[0073] Step S203: if the working state is the discharging state, determining whether the battery is to be discharged and current reduced based on a predetermined battery state of charge and a preset state of charge threshold.

[0074] If the battery state of charge is less than the state of charge threshold, it is determined that the battery is being discharged to reduce the current.

[0075] Among them, the state of charge threshold can be 20%.

[0076] Step S204: if discharging and current reduction is performed, an initial operating current is determined based on the current current and a predetermined fourth current threshold.

[0077] If the current current is greater than the fourth current threshold, the initial operating current is the fourth current threshold; if the current current is less than or equal to the fourth current threshold, the initial operating current is the current current.

[0078] The fourth current threshold may be 30A.

[0079] For example, if the current current is greater than 30A, the initial operating current is 30A; if the current current is less than or equal to 30A, such as 20A, the initial operating current is 20A.

[0080] Example 3

[0081] Corresponding to the above method embodiment, the embodiment of the present invention provides a device for controlling the voltage difference at the end of charging and discharging of an energy storage system, Figure 3 A schematic diagram of a control device for a charge / discharge terminal pressure difference of an energy storage system provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the control device for the voltage difference at the end of charge and discharge of the energy storage system may include:

[0082] The working state determination module 301 is used to determine the working state of the battery in response to the operation of the energy storage system; the working state includes a charging state and a discharging state.

[0083] The voltage and current acquisition module 302 is used to acquire the current voltage and current of the battery.

[0084] The initial operating current determination module 303 is used to determine the initial operating current of the battery based on the working state, the current voltage and the current current.

[0085] The working control module 304 is used to control the battery to work based on the initial operating current, and obtain the post-operation voltage and post-operation current.

[0086] The target operating current determination module 305 is used to adjust the initial operating current based on the post-operation voltage and the post-operation current to obtain a target operating current.

[0087] The battery control module 306 is used to control the battery to work based on the target operating current until the battery operation ends.

[0088] The control device for the voltage difference at the end of charge and discharge of the energy storage system provided in the embodiment of the present invention can determine the working state of the battery in response to the operation of the energy storage system, the working state includes the charging state and the discharging state, obtain the current voltage and current of the battery, determine the initial operating current of the battery based on the working state, the current voltage and the current current, control the battery to work based on the initial operating current, obtain the post-operation voltage and the post-operation current, adjust the initial operating current based on the post-operation voltage and the post-operation current, obtain the target operating current, and control the battery to work based on the target operating current until the battery ends its operation. In this method, the life of the energy storage system is improved by limiting the voltage difference at the end of charge and discharge of the system.

[0089] In some embodiments, the initial operating current determination module is also used to determine whether the battery is charging and reducing the current based on the current voltage and a preset charging voltage threshold if the operating state is a charging state; the charging voltage threshold is adjusted based on the health of the battery; if charging and reducing the current is performed, the initial operating current is determined based on the number of times the current voltage meets the charging voltage threshold and the current current.

[0090] In some embodiments, the initial operating current determination module is also used to determine that if the current voltage satisfies the charging voltage threshold 1 time, then when the current current is greater than a preset first current threshold, the initial operating current is the first current threshold; when the current current is less than or equal to the first current threshold, the initial operating current is the current current; if the current voltage satisfies the charging voltage threshold 1 time, then when the current current is greater than a preset second current threshold, the initial operating current is the second current threshold; when the current current is less than or equal to the second current threshold, the initial operating current is the current current; the first current threshold is greater than the second current threshold.

[0091] In some embodiments, the target operating current determination module is also used to compare the post-operation current with a pre-set third current threshold if the post-operation voltage meets the charging voltage threshold; if the post-operation current is greater than the third current threshold, the initial operating current is adjusted to the third current threshold, and the third current threshold is used as the target operating current; if the post-operation current is less than or equal to the third current threshold, the initial operating current is adjusted to the post-operation current, and the post-operation current is used as the target operating current.

[0092] In some embodiments, the initial operating current determination module is also used to determine whether the battery is discharging to reduce the current based on a predetermined battery state of charge and a preset state of charge threshold if the operating state is a discharging state; if discharging to reduce the current, the initial operating current is determined based on the current current and a predetermined current threshold.

[0093] In some embodiments, the initial operating current determination module is also used to determine that the battery is discharging and reducing the current if the battery state of charge is less than the charge state threshold; if the current current is greater than the current threshold, the initial operating current is the current threshold; if the current current is less than or equal to the current threshold, the initial operating current is the current current.

[0094] In some embodiments, after the initial operating current and the target operating current are determined, the initial operating current and the target operating current are adjusted based on the battery state of charge, the temperature, and the duration of the temperature of the battery.

[0095] The device provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0096] Example 4

[0097] The embodiment of the present invention also provides an electronic device for operating the above-mentioned method for controlling the voltage difference at the end of charge and discharge of the energy storage system; Figure 4A structural schematic diagram of an electronic device is shown, the electronic device includes a memory 400 and a processor 401, wherein the memory 400 is used to store one or more computer instructions, and the one or more computer instructions are executed by the processor 401 to implement the above-mentioned method for controlling the pressure difference at the charging and discharging ends of the energy storage system.

[0098] Further, Figure 4 The electronic device shown further includes a bus 402 and a communication interface 403 , and the processor 401 , the communication interface 403 and the memory 400 are connected via the bus 402 .

[0099] The memory 400 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 403 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used. The bus 402 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0100] The processor 401 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 401. The above processor 401 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 gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present invention can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module may be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 400, and the processor 401 reads the information in the memory 400 and completes the steps of the method of the above embodiment in combination with its hardware.

[0101] An embodiment of the present invention further provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to implement the above-mentioned method for controlling the pressure difference at the charging and discharging ends of the energy storage system. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0102] The computer program product of the method for controlling the terminal pressure difference of the energy storage system provided in the embodiment of the present invention includes a computer-readable storage medium storing a non-volatile program code executable by a processor, and the instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be referred to the method embodiment, which will not be repeated here.

[0103] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0104] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0105] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0106] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0107] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that can be executed by a processor. Based on this understanding, the technical solution of the present invention, 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. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or 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, etc., various media that can store program codes.

[0108] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for controlling the voltage difference at the end of charge and discharge of an energy storage system, characterized in that: The method comprises: In response to the operation of the energy storage system, determining the working state of the battery; the working state includes a charging state and a discharging state; Get the current voltage and current of the battery; determining an initial operating current of the battery based on the operating state, the current voltage, and the current current; Control the battery to operate based on the initial operating current, and obtain a voltage and a current after operation; Adjusting the initial operating current based on the post-operation voltage and the post-operation current to obtain a target operating current; Controlling the battery to operate based on the target operating current until the battery operation ends; The determining the initial operating current of the battery based on the working state, the current voltage and the current current includes: If the working state is a charging state, determining whether the battery is to be charged and reduced current based on the current voltage and a preset charging voltage threshold; the charging voltage threshold is adjusted based on the health of the battery; If charging and current reduction are performed, determining the initial operating current based on the number of times the current voltage meets the charging voltage threshold and the current current; The determining the initial operating current based on the number of times the current voltage meets the charging voltage threshold and the current current includes: If the number of times that the current voltage satisfies the charging voltage threshold is 1, then when the current current is greater than a preset first current threshold, the initial operating current is the first current threshold; When the current current is less than or equal to the first current threshold, the initial operating current is the current current; If the number of times that the current voltage satisfies the charging voltage threshold is greater than 1, then when the current current is greater than a preset second current threshold, the initial operating current is the second current threshold; When the current current is less than or equal to the second current threshold, the initial operating current is the current current; and the first current threshold is greater than the second current threshold.

2. The method according to claim 1, characterized in that The adjusting the initial operating current based on the post-operation voltage and the post-operation current to obtain a target operating current includes: If the post-operation voltage satisfies the charging voltage threshold, comparing the post-operation current with a preset third current threshold; If the post-operation current is greater than the third current threshold, adjusting the initial operation current to the third current threshold, and using the third current threshold as the target operation current; If the post-operation current is less than or equal to the third current threshold, the initial operation current is adjusted to the post-operation current, and the post-operation current is used as the target operation current.

3. The method according to claim 1, characterized in that The determining of the initial operating current based on the number of times the current voltage meets the charging voltage threshold and the current current further includes: If the working state is a discharging state, determining whether the battery is to be discharged and current reduced based on a predetermined battery state of charge and a preset state of charge threshold; If the discharge current reduction is performed, the initial operation current is determined based on the present current and a predetermined fourth current threshold.

4. The method according to claim 3, characterized in that The determining whether the battery is to be discharged and current reduced based on a predetermined battery state of charge and a preset state of charge threshold comprises: If the battery state of charge is less than the state of charge threshold, determining that the battery is to be discharged and current reduced; The determining the initial operating current based on the current current and a predetermined fourth current threshold value comprises: If the current current is greater than the fourth current threshold, the initial operating current is the fourth current threshold; If the current current is less than or equal to the fourth current threshold, the initial operating current is the current current.

5. The method according to claim 1, characterized in that The method further includes: after the initial operating current and the target operating current are determined, adjusting the initial operating current and the target operating current based on a battery state of charge, a temperature, and a duration of the temperature of the battery.

6. A device for controlling the voltage difference at the end of charge and discharge of an energy storage system, characterized in that: A method for controlling the voltage difference at the end of charge and discharge of an energy storage system according to any one of claims 1 to 5, the device comprising: A working state determination module, used to determine the working state of the battery in response to the operation of the energy storage system; the working state includes a charging state and a discharging state; A voltage and current acquisition module, used to obtain the current voltage and current of the battery; an initial operating current determining module, configured to determine an initial operating current of the battery based on the operating state, the current voltage and the current current; A working control module, used for controlling the battery to work based on the initial operating current, and obtaining a post-operation voltage and a post-operation current; A target operating current determination module, used for adjusting the initial operating current based on the post-operation voltage and the post-operation current to obtain a target operating current; The battery control module is used to control the battery to operate based on the target operating current until the battery operation ends.

7. An electronic device, characterized in that: It includes a processor and a memory, the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the method for controlling the terminal pressure difference of charging and discharging of the energy storage system as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are called and executed by the processor, the computer-executable instructions prompt the processor to implement the method for controlling the charge and discharge terminal pressure difference of the energy storage system according to any one of claims 1 to 5.

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