Balancing method and device of energy storage system, electronic equipment and storage medium

Abstract

The invention provides an equalization method and device of an energy storage system, electronic equipment and a storage medium, and relates to the technical field of energy storage equalization, and the method comprises the steps: obtaining the static voltage of a plurality of battery clusters and the standby time corresponding to the energy storage system; carrying out difference processing on the static voltages of the plurality of battery clusters in pairs, and determining a plurality of inter-cluster static voltage differences; determining an equalization mode of the energy storage system based on the plurality of inter-cluster static pressure differences and the standby time; if the equalization mode is an equalization maintenance mode, determining the lowest voltage and the highest voltage in respective static voltages of the plurality of battery clusters; and communicating the lowest battery cluster corresponding to the lowest voltage with the highest battery cluster corresponding to the highest voltage through an equalization loop, and performing equalization adjustment on the lowest battery cluster and the highest battery cluster based on a preset equalization strategy. In the mode, the balance among a plurality of battery clusters of the energy storage system is realized under the condition that the normal work of the energy storage system is not delayed, and the service life of the energy storage system is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage balancing, and in particular to a balancing method, device, electronic equipment and storage medium for an energy storage system. Background Art

[0002] Balancing has always been a pain point for energy storage systems. Balancing the energy storage system can not only increase the life of the energy storage system, but also avoid the circulation impact caused by excessive pressure difference and the resulting system failure to operate. Therefore, how to achieve balancing between multiple battery clusters in the energy storage system is an urgent problem to be solved. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a balancing method, device, electronic device and storage medium for an energy storage system, which realizes the balancing between multiple battery clusters of the energy storage system without delaying the normal operation of the energy storage system, improves the life of the energy storage system, and avoids the circulation influence caused by excessive pressure difference and the resulting system inability to operate.

[0004] In a first aspect, an embodiment of the present invention provides a balancing method for an energy storage system, the energy storage system comprising a plurality of battery clusters, the method comprising: obtaining a quiescent voltage of each of the plurality of battery clusters and a corresponding standby time of the energy storage system; performing difference processing on the quiescent voltages of each of the plurality of battery clusters, and determining a quiescent pressure difference between the plurality of clusters; determining a balancing mode of the energy storage system based on the quiescent pressure differences between the plurality of clusters and the standby time; if the balancing mode is a balancing maintenance mode, determining a lowest voltage and a highest voltage among the quiescent voltages of the plurality of battery clusters; connecting a lowest battery cluster corresponding to the lowest voltage and a highest battery cluster corresponding to the highest voltage through a balancing circuit, and performing balancing adjustment on the lowest battery cluster and the highest battery cluster based on a pre-set balancing strategy.

[0005] In a preferred embodiment of the present invention, the above-mentioned determination of the balancing mode of the energy storage system based on multiple inter-cluster static pressure differences and standby time includes: comparing the multiple inter-cluster static pressure differences with pre-set pressure difference thresholds respectively; if there is an inter-cluster static pressure difference that meets the pressure difference threshold, comparing the standby time with the pre-set time threshold; if the standby time is greater than the pre-set time threshold, the balancing mode is the balanced maintenance mode; if the standby time is less than or equal to the time threshold, the balancing mode is the balanced operation mode; if there is no inter-cluster static pressure difference that meets the pressure difference threshold, the balancing mode is the balanced static mode.

[0006] In a preferred embodiment of the present invention, after determining the balancing mode of the energy storage system based on the static pressure difference and the standby time between multiple clusters, the method also includes: if the balancing mode is a balanced operation mode, averaging the static voltages of the multiple battery clusters to obtain an average cluster voltage; comparing the static voltages of the multiple battery clusters with the average cluster voltage to determine a target battery cluster whose static voltage is less than the average cluster voltage; connecting the multiple battery clusters in pairs through a balancing circuit, and performing balancing adjustments on the target battery cluster based on a pre-set balancing strategy.

[0007] In a preferred embodiment of the present invention, the above-mentioned balancing adjustment of the target battery cluster based on the preset balancing strategy includes: the target battery cluster requests a first voltage and a first current from the balancing circuit; and the balancing circuit balances the target battery cluster through the first voltage and the first current.

[0008] In a preferred embodiment of the present invention, the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage are connected through a balancing circuit, and the lowest battery cluster and the highest battery cluster are balanced and adjusted based on a preset balancing strategy, including: the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage are connected through a balancing circuit, and the lowest battery cluster requests a second voltage and a second current from the balancing circuit; the balancing circuit balances the lowest battery cluster through the second voltage and the second current until the inter-cluster static pressure difference between the lowest battery cluster and the highest battery cluster meets a preset static pressure difference threshold, and the balancing circuit is disconnected.

[0009] In a preferred embodiment of the present invention, after disconnecting the balancing loop, the method further includes: re-determining the lowest voltage and the highest voltage among the quiescent voltages of the plurality of battery clusters to balance the energy storage system until the quiescent pressure differences among the plurality of clusters meet the quiescent pressure difference threshold.

[0010] In a preferred embodiment of the present invention, the balancing loop includes a DC-DC converter, and multiple battery clusters are connected with DC-DC converters. When performing balancing adjustment, the corresponding DC-DC converters are connected based on the balancing strategy.

[0011] In a second aspect, an embodiment of the present invention further provides a balancing device for an energy storage system, the energy storage system comprising a plurality of battery clusters, the device comprising: an acquisition module for acquiring the quiescent voltages of the plurality of battery clusters and the corresponding standby time of the energy storage system; an inter-cluster quiescent pressure difference determination module for performing difference processing on the quiescent voltages of the plurality of battery clusters in pairs to determine the plurality of inter-cluster quiescent pressure differences; a balancing mode determination module for determining the balancing mode of the energy storage system based on the plurality of inter-cluster quiescent pressure differences and the standby time; a voltage determination module for determining the lowest voltage and the highest voltage among the quiescent voltages of the plurality of battery clusters if the balancing mode is a balancing maintenance mode; and an energy storage system balancing module for connecting the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing circuit based on a pre-set balancing strategy to balance the energy storage system.

[0012] 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 energy storage system balancing method of the first aspect mentioned above.

[0013] 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 energy storage system balancing method of the first aspect mentioned above.

[0014] The embodiments of the present invention bring the following beneficial effects: The embodiment of the present invention provides a method, device, electronic device and storage medium for balancing an energy storage system, which obtains the quiescent voltage of each of the multiple battery clusters and the corresponding standby time of the energy storage system; performs difference processing on the quiescent voltages of the multiple battery clusters to determine the quiescent pressure difference between the multiple clusters; determines the balancing mode of the energy storage system based on the quiescent pressure difference between the multiple clusters and the standby time; if the balancing mode is the balancing maintenance mode, determines the lowest voltage and the highest voltage among the quiescent voltages of the multiple battery clusters; connects the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing loop, and performs balancing adjustment on the lowest battery cluster and the highest battery cluster based on a preset balancing strategy. In this way, the balancing between the multiple battery clusters of the energy storage system is achieved without delaying the normal operation of the energy storage system, thereby improving the life of the energy storage system and avoiding the circulation influence caused by the excessive pressure difference and the resulting inability of the system to operate.

[0015] 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.

[0016] 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

[0017] 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.

[0018] Figure 1 A flow chart of a balancing method for an energy storage system provided by an embodiment of the present invention; Figure 2 A schematic diagram of a charge-discharge balancing circuit of an energy storage system provided by an embodiment of the present invention; Figure 3 A flow chart of another energy storage system balancing method provided by an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a balancing device for an energy storage system provided by an embodiment of the present invention; Figure 5 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] 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.

[0020] Balancing has always been a pain point for energy storage systems. Balancing the energy storage system can not only increase the life of the energy storage system, but also avoid the circulation impact caused by excessive pressure difference and the resulting system failure to operate. Therefore, how to achieve balancing between multiple battery clusters in the energy storage system is an urgent problem to be solved.

[0021] Based on this, an energy storage system balancing method, device, electronic device and storage medium provided by an embodiment of the present invention can obtain the quiescent voltage of each of the multiple battery clusters and the corresponding standby time of the energy storage system; perform difference processing on the quiescent voltages of each of the multiple battery clusters to determine the quiescent pressure difference between the multiple clusters; determine the balancing mode of the energy storage system based on the quiescent pressure difference between the multiple clusters and the standby time; if the balancing mode is the balancing maintenance mode, determine the lowest voltage and the highest voltage among the quiescent voltages of the multiple battery clusters; connect the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing loop, and balance the lowest battery cluster and the highest battery cluster based on a pre-set balancing strategy. In this way, the balancing between the multiple battery clusters of the energy storage system is achieved without delaying the normal operation of the energy storage system, which improves the life of the energy storage system and avoids the circulation influence caused by excessive pressure difference and the resulting inability of the system to operate.

[0022] To facilitate understanding of this embodiment, a balancing method for an energy storage system disclosed in an embodiment of the present invention is first introduced in detail.

[0023] Example 1 The embodiment of the present invention provides a method for balancing an energy storage system. Figure 1 The following is a flow chart of a method for balancing an energy storage system provided by an embodiment of the present invention. Figure 1 As shown, the balancing method of the energy storage system may include the following steps: Step S101, obtaining the static voltage of each of a plurality of battery clusters and the corresponding standby time of the energy storage system.

[0024] The static voltage is the voltage of the battery cluster when it is not charging or discharging, and the standby time is the duration of the energy storage system not charging or discharging. The standby time can be determined according to the charging and discharging tasks of the energy storage system.

[0025] Step S102 , performing a difference process on the static voltages of the plurality of battery clusters in pairs to determine static voltage differences between the plurality of clusters.

[0026] For example, there are three battery clusters, namely battery cluster A, battery cluster B and battery cluster C. The quiescent voltages of the multiple battery clusters are processed pairwise, that is, the quiescent voltage of battery cluster A is subtracted from the quiescent voltage of battery cluster B to obtain the corresponding inter-cluster quiescent pressure difference, the quiescent voltage of battery cluster A is subtracted from the quiescent voltage of battery cluster C to obtain the corresponding inter-cluster quiescent pressure difference, and the quiescent voltage of battery cluster B is subtracted from the quiescent voltage of battery cluster C to obtain the corresponding inter-cluster quiescent pressure difference.

[0027] Step S103 : determining a balancing mode of the energy storage system based on static pressure differences and standby times between multiple clusters.

[0028] Among them, the balancing mode may include a balancing maintenance mode, a balancing operation mode, and a balancing static mode. The balancing maintenance mode is a mode performed under the condition that the standby time is sufficient and there is a balancing demand. This mode performs balancing cluster by cluster and has the highest precision. The balancing operation mode is a mode performed under the condition that the standby time is not sufficient but there is a balancing demand. This mode performs balancing based on the determined average cluster voltage and the static voltage of the battery cluster, and has a slightly lower precision than the balancing maintenance mode. The balancing static mode is a mode performed under the condition that there is no balancing demand, and usually no balancing control is performed.

[0029] Step S104 : if the balancing mode is the balancing maintenance mode, determining the lowest voltage and the highest voltage among the quiescent voltages of the plurality of battery clusters.

[0030] Among them, by determining the lowest voltage and the highest voltage, the two clusters of voltages can be balanced preferentially to greatly improve the consistency of the system static voltage.

[0031] Step S105 , connecting the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing loop, and performing balancing adjustment on the lowest battery cluster and the highest battery cluster based on a preset balancing strategy.

[0032] The balancing loop includes a DC-DC converter (DC / DC), and multiple battery clusters are connected with DC-DC converters. When performing balancing adjustment, the corresponding DC-DC converters are connected based on the balancing strategy.

[0033] For ease of understanding, Figure 2 A schematic diagram of a charge-discharge balancing circuit of an energy storage system provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the charge-discharge balancing circuit includes a balancing loop and a system charge-discharge main loop. The DC-DC converter in the balancing loop is connected to the high-voltage box, and the high-voltage box is connected to the battery cluster (PACK). Figure 2 In the figure, n battery cluster branches are taken as an example. When performing balancing adjustment, the DC-DC converters between battery clusters are turned on and off through the balancing strategy. When the energy storage system is working normally, the circuit breaker is closed to connect to the PCS (Power Conversion System) and the grid to work.

[0034] The energy storage system balancing method provided in the embodiment of the present invention can obtain the quiescent voltage of each of the multiple battery clusters and the corresponding standby time of the energy storage system; perform difference processing on the quiescent voltages of each of the multiple battery clusters to determine the quiescent pressure difference between the multiple clusters; determine the balancing mode of the energy storage system based on the quiescent pressure difference between the multiple clusters and the standby time; if the balancing mode is the balancing maintenance mode, determine the lowest voltage and the highest voltage among the quiescent voltages of the multiple battery clusters; connect the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing loop, and balance the lowest battery cluster and the highest battery cluster based on a preset balancing strategy. In this way, the balancing between the multiple battery clusters of the energy storage system is achieved without delaying the normal operation of the energy storage system, thereby improving the life of the energy storage system and avoiding the circulation influence caused by excessive pressure difference and the resulting inability of the system to operate.

[0035] Example 2 The embodiment of the present invention also provides another balancing method for an energy storage system; this method is implemented on the basis of the method in the above embodiment.

[0036] Figure 3 A flowchart of another energy storage system balancing method provided by an embodiment of the present invention, such as Figure 3 As shown, the balancing method of the energy storage system may include the following steps: Step S201 , obtaining the static voltage of each of the plurality of battery clusters and the corresponding standby time of the energy storage system.

[0037] Step S202 , performing a difference process on the static voltages of the plurality of battery clusters in pairs to determine static voltage differences between the plurality of clusters.

[0038] Among them, step S201 and step S202 are similar to the above-mentioned step S101 and step S102, and are not described in detail here.

[0039] Step S203 : determining a balancing mode of the energy storage system based on static pressure differences and standby times between multiple clusters.

[0040] Specifically, determining the operation mode of the energy storage system based on multiple inter-cluster static pressure differences and standby times may include: comparing the multiple inter-cluster static pressure differences with pre-set pressure difference thresholds respectively; if there is an inter-cluster static pressure difference that meets the pressure difference threshold, comparing the standby time with the pre-set time threshold; if the standby time is greater than the pre-set time threshold, the balancing mode is the balanced maintenance mode; if the standby time is less than or equal to the time threshold, the balancing mode is the balanced operation mode; if there is no inter-cluster static pressure difference that meets the pressure difference threshold, the balancing mode is the balanced static mode.

[0041] The voltage difference threshold may be 20V, and if it is greater than 20V, it is considered to meet the voltage difference threshold. The time threshold may be 30 minutes, and if it is greater than 30 minutes, it is considered to meet the time threshold.

[0042] Among them, for the balanced maintenance mode, the voltage difference threshold and the time threshold can be further divided and matched. For example, when the voltage difference threshold range is (20V, 40V), the time threshold is greater than 30 minutes, and when the voltage difference range is above 40V, the time threshold is greater than 60 minutes.

[0043] Step S204 , if the balancing mode is the balancing operation mode, average processing is performed on the static voltages of the plurality of battery clusters to obtain an average cluster voltage.

[0044] For example, there are three battery clusters, namely battery cluster A, battery cluster B and battery cluster C. The average cluster voltage is obtained by summing the static voltages of battery cluster A, battery cluster B and battery cluster C and dividing the sum by 3.

[0045] Step S205 : Compare the quiescent voltages of the plurality of battery clusters with the average cluster voltage respectively, and determine a target battery cluster whose quiescent voltage is less than the average cluster voltage.

[0046] For a target battery cluster with a voltage lower than the average cluster voltage, a balancing adjustment needs to be performed. For a battery cluster with a voltage higher than the average cluster voltage, the high-voltage box of the battery cluster can meet the requirement of external discharge at this time.

[0047] Step S206 , connecting the multiple battery clusters in pairs through a balancing loop, and performing balancing adjustment on the target battery cluster based on a preset balancing strategy.

[0048] Specifically, performing balancing adjustment on the target battery cluster based on a preset balancing strategy may include: the target battery cluster making a first voltage request and a first current request to the balancing circuit; and the balancing circuit performing balancing adjustment on the target battery cluster through the first voltage and the first current.

[0049] The first voltage may be 20V, and the first current may be 30A. It should be noted that the first voltage and the first current may be adjusted according to the static voltage difference between clusters, which is not limited here.

[0050] Step S207 : if the balancing mode is the balancing maintenance mode, determining the lowest voltage and the highest voltage among the quiescent voltages of the plurality of battery clusters.

[0051] Among them, step S207 is similar to step S104 and is not described in detail here.

[0052] Step S208 , connecting the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing loop, and performing balancing adjustment on the lowest battery cluster and the highest battery cluster based on a preset balancing strategy.

[0053] Specifically, the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage are connected through a balancing circuit, and the lowest battery cluster requests a second voltage and a second current from the balancing circuit; the balancing circuit balances the lowest battery cluster through the second voltage and the second current until the inter-cluster static pressure difference between the lowest battery cluster and the highest battery cluster meets a preset static pressure difference threshold, and then disconnects the balancing circuit; and the lowest voltage and the highest voltage among the static voltages of the multiple battery clusters are determined again to balance the energy storage system until the static pressure differences between the multiple clusters meet the static pressure difference threshold.

[0054] The second voltage may be 20 V, the second current may be 30 A, and the static voltage difference threshold may be 15 V. It should be noted that the second voltage and the second current may be adjusted according to the static voltage difference between clusters, which is not limited here.

[0055] After determining the highest voltage and the lowest voltage, the lowest battery cluster corresponding to the highest voltage and the highest battery cluster corresponding to the highest voltage are connected through a balancing circuit, and at the same time, the lowest battery cluster requests the second voltage and the second current from the corresponding balancing circuit to perform balancing maintenance until the static pressure difference between the highest battery cluster and the lowest battery cluster is less than the static pressure difference threshold, and then the new highest voltage and the lowest voltage are re-determined and the above operation is repeated until the static pressure difference between all clusters is less than the static pressure difference threshold. This greatly improves the precision of balancing.

[0056] Example 3 Corresponding to the above method embodiment, the embodiment of the present invention provides a balancing device for an energy storage system, Figure 4 A structural diagram of a balancing device for an energy storage system provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, the balancing device of the energy storage system may include: The acquisition module 301 is used to acquire the static voltage of each of the multiple battery clusters and the corresponding standby time of the energy storage system.

[0057] The inter-cluster static pressure difference determination module 302 is used to perform a difference processing on the static voltages of the plurality of battery clusters in pairs to determine a plurality of inter-cluster static pressure differences.

[0058] The balancing mode determination module 303 is used to determine the balancing mode of the energy storage system based on static pressure differences and standby times between multiple clusters.

[0059] The voltage determination module 304 is configured to determine the lowest voltage and the highest voltage of the static voltages of the plurality of battery clusters if the balancing mode is the balancing maintenance mode.

[0060] The energy storage system balancing module 305 is used to connect the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing loop based on a preset balancing strategy to balance the energy storage system.

[0061] The energy storage system balancing device provided in the embodiment of the present invention can obtain the quiescent voltage of each of the multiple battery clusters and the corresponding standby time of the energy storage system; perform difference processing on the quiescent voltages of each of the multiple battery clusters to determine the quiescent pressure difference between the multiple clusters; determine the balancing mode of the energy storage system based on the quiescent pressure difference between the multiple clusters and the standby time; if the balancing mode is the balancing maintenance mode, determine the lowest voltage and the highest voltage among the quiescent voltages of the multiple battery clusters; connect the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing loop, and balance the lowest battery cluster and the highest battery cluster based on a preset balancing strategy. In this way, the balancing between the multiple battery clusters of the energy storage system is achieved without delaying the normal operation of the energy storage system, thereby improving the life of the energy storage system and avoiding the circulation influence caused by excessive pressure difference and the resulting inability of the system to operate.

[0062] In some embodiments, the balancing mode determination module is also used to compare the static pressure differences between multiple clusters with pre-set pressure difference thresholds; if there is a static pressure difference between clusters that meets the pressure difference threshold, the standby time is compared with the pre-set time threshold; if the standby time is greater than the pre-set time threshold, the balancing mode is the balanced maintenance mode; if the standby time is less than or equal to the time threshold, the balancing mode is the balanced operation mode; if there is no static pressure difference between clusters that meets the pressure difference threshold, the balancing mode is the balanced static mode.

[0063] In some embodiments, the energy storage system balancing module is also used to, if the balancing mode is a balancing operation mode, average the quiescent voltages of the multiple battery clusters to obtain an average cluster voltage; compare the quiescent voltages of the multiple battery clusters with the average cluster voltage to determine a target battery cluster whose quiescent voltage is less than the average cluster voltage; connect the multiple battery clusters in pairs through a balancing circuit, and perform balancing adjustments on the target battery cluster based on a pre-set balancing strategy.

[0064] In some embodiments, the energy storage system balancing module is further used for the target battery cluster to request a first voltage and a first current from the balancing circuit; the balancing circuit performs balancing adjustment on the target battery cluster through the first voltage and the first current.

[0065] In some embodiments, the energy storage system balancing module is further used to connect the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing circuit, and the lowest battery cluster requests a second voltage and a second current from the balancing circuit; the balancing circuit balances the lowest battery cluster through the second voltage and the second current until the inter-cluster static pressure difference between the lowest battery cluster and the highest battery cluster meets a preset static pressure difference threshold, and then disconnects the balancing circuit.

[0066] In some embodiments, the energy storage system balancing module is further used to re-determine the lowest voltage and the highest voltage among the static voltages of the multiple battery clusters to balance the energy storage system until the static pressure differences between the multiple clusters meet the static pressure difference threshold.

[0067] In some embodiments, the balancing loop includes a DC-DC converter, and multiple battery clusters are connected with DC-DC converters. When performing balancing adjustment, the corresponding DC-DC converters are connected based on the balancing strategy.

[0068] 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.

[0069] Example 4 The embodiment of the present invention also provides an electronic device for running the above energy storage system balancing method; see Figure 5 A 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 balancing method of the energy storage system.

[0070] Further, Figure 5 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 .

[0071] 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 5 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.

[0072] 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.

[0073] 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 energy storage system balancing method. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0074] The computer program product for the energy storage system balancing method provided in the embodiment of the present invention includes a computer-readable storage medium storing a non-volatile program code executable by a processor. 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 balancing an energy storage system, characterized in that: The energy storage system includes a plurality of battery clusters, and the method includes: Obtaining the static voltage of each of the plurality of battery clusters and the corresponding standby time of the energy storage system; performing a difference processing on the static voltages of the plurality of battery clusters in pairs to determine static voltage differences between the plurality of clusters; Determining a balancing mode of the energy storage system based on a plurality of static pressure differences between the clusters and the standby time; If the balancing mode is a balancing maintenance mode, determining a lowest voltage and a highest voltage among the static voltages of the plurality of battery clusters; The lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage are connected through a balancing loop, and balancing adjustment is performed on the lowest battery cluster and the highest battery cluster based on a preset balancing strategy.

2. The method according to claim 1, characterized in that: The determining of the balancing mode of the energy storage system based on the static pressure differences between the multiple clusters and the standby time includes: Comparing the plurality of static pressure differences between the clusters with preset pressure difference thresholds respectively; If there is an inter-cluster static pressure difference that meets the pressure difference threshold, comparing the standby time with a preset time threshold; If the standby time is greater than a preset time threshold, the balancing mode is a balancing maintenance mode; If the standby time is less than or equal to the time threshold, the balancing mode is a balancing operation mode; If there is no inter-cluster static pressure difference that meets the pressure difference threshold, the balanced mode is the balanced static mode.

3. The method according to claim 1, characterized in that After determining the balancing mode of the energy storage system based on the static pressure differences between the multiple clusters and the standby time, the method further includes: If the balancing mode is a balancing operation mode, averaging the static voltages of the plurality of battery clusters to obtain an average cluster voltage; Comparing the quiescent voltages of the plurality of battery clusters with the average cluster voltage, respectively, to determine a target battery cluster whose quiescent voltage is less than the average cluster voltage; The plurality of battery clusters are connected in pairs through a balancing loop, and balancing adjustment is performed on the target battery cluster based on a preset balancing strategy.

4. The method according to claim 3, characterized in that The step of performing balancing adjustment on the target battery cluster based on a preset balancing strategy includes: The target battery cluster requests a first voltage and a first current from the balancing circuit; The balancing circuit performs balancing adjustment on the target battery cluster through the first voltage and the first current.

5. The method according to claim 1, characterized in that The connecting the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing circuit, and performing balancing adjustment on the lowest battery cluster and the highest battery cluster based on a preset balancing strategy, includes: Connecting the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing circuit, wherein the lowest battery cluster requests a second voltage and a second current from the balancing circuit; The balancing loop balances the lowest battery cluster through the second voltage and the second current until the inter-cluster static pressure difference between the lowest battery cluster and the highest battery cluster meets a preset static pressure difference threshold, and then disconnects the balancing loop.

6. The method according to claim 5, characterized in that After disconnecting the balancing loop, the method further includes: The lowest voltage and the highest voltage among the static voltages of the plurality of battery clusters are determined again to balance the energy storage system until the static pressure differences between the plurality of clusters meet the static pressure difference threshold.

7. The method according to claim 1, characterized in that The balancing loop includes a DC-DC converter, and the DC-DC converters are connected between the plurality of battery clusters. When performing balancing adjustment, the corresponding DC-DC converters are connected based on the balancing strategy.

8. A balancing device for an energy storage system, characterized in that: The energy storage system includes a plurality of battery clusters, and the device includes: An acquisition module, used for acquiring the static voltage of each of the plurality of battery clusters and the corresponding standby time of the energy storage system; An inter-cluster static pressure difference determination module, used for performing a difference processing between the static voltages of the plurality of battery clusters, and determining a plurality of inter-cluster static pressure differences; A balancing mode determination module, configured to determine a balancing mode of the energy storage system based on a plurality of static pressure differences between the clusters and the standby time; a voltage determination module, configured to determine a lowest voltage and a highest voltage among the static voltages of the plurality of battery clusters if the balancing mode is a balancing maintenance mode; The energy storage system balancing module is used to connect the lowest battery cluster corresponding to the lowest voltage and the highest battery cluster corresponding to the highest voltage through a balancing loop based on a preset balancing strategy to balance the energy storage system.

9. An electronic device, characterized in that: It comprises 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 energy storage system balancing method according to any one of claims 1 to 7.

10. 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 a processor, the computer-executable instructions prompt the processor to implement the energy storage system balancing method according to any one of claims 1 to 7.

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