Control method of sodium ion energy storage system

Abstract

The invention relates to the technical field of energy storage, in particular to a control method of a sodium ion energy storage system, the control method is applied to a BMS unit in the sodium ion energy storage system, the sodium ion energy storage system comprises a plurality of battery clusters, and each battery cluster is connected with the BMS unit; the method comprises the following steps: acquiring a first cluster voltage difference of each battery cluster in the sodium ion energy storage system; judging whether each first cluster pressure difference is smaller than a first pressure difference threshold value or not; and if not, determining that the current state of the sodium ion energy storage system is the to-be-charged equalization state. According to the control method of the sodium ion energy storage system provided by the invention, the first cluster voltage difference corresponding to each battery cluster is compared with the first voltage difference threshold value to determine whether the state is the to-be-charged equalization state, and the energy storage distribution of the sodium ion energy storage system is carried out after the charging equalization instruction is received until each cluster voltage difference meets the working requirement. Therefore, the operation stability and reliability of the sodium ion energy storage system are improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a control method for a sodium ion energy storage system. Background Art

[0002] Compared with lithium-ion batteries, which are commonly used in the current energy storage market, sodium-ion batteries have many advantages, such as abundant resources, low material costs, long service life, and good safety. It has the advantages of high temperature resistance and resistance to large current shocks, and can still maintain high efficiency and safety performance when operating at high temperatures. More importantly, sodium resources are extremely abundant, hundreds of times that of lithium resources. Therefore, once the sodium battery industry is well-equipped, the cost of batteries will be greatly reduced, and its broad prospects have attracted many players to invest in this new track. New technologies promote energy transformation, and the potential of sodium batteries in high and low temperature performance, deep charging and discharging, and long cycle life indicate that its application prospects in the field of energy storage will be broader. The implementation of sodium-ion energy storage will accelerate the construction of new power systems. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a control method for a sodium ion energy storage system.

[0004] In a first aspect, an embodiment of the present invention provides a control method for a sodium ion energy storage system, which is applied to a BMS unit in the sodium ion energy storage system. The sodium ion energy storage system includes a plurality of battery clusters, each of which is connected to the BMS unit; the BMS unit is communicatively connected to the EMS unit; the method includes:

[0005] Obtaining a first cluster pressure difference of each battery cluster in the sodium ion energy storage system;

[0006] Determining whether the pressure differences of each first cluster are less than a first pressure difference threshold;

[0007] If not, determine that the current state of the sodium ion energy storage system is a state to be charged and balanced, and send a charge and balance request to the EMS unit;

[0008] If the charge equalization command sent by the EMS unit is received within the set time, the charge equalization mode is started;

[0009] Acquire the second cluster voltage difference of each battery cluster, and exit the charge balancing mode when the plurality of second cluster voltage differences are all less than the second voltage difference threshold;

[0010] The first pressure difference threshold is greater than or equal to the second pressure difference threshold.

[0011] In combination with the first aspect, in response to a charge equalization instruction input by a user, the step of starting the charge equalization mode includes:

[0012] Combining the first cluster voltage corresponding to each battery cluster, sorting the battery clusters in ascending order;

[0013] Based on the ascending order, the relays corresponding to the battery clusters are closed in sequence, and the battery clusters are charged with a specified current until the third cluster voltage difference of each battery cluster is less than the first voltage difference threshold;

[0014] When the relays corresponding to all battery clusters are in a closed state, the charge balancing mode is exited and the normal operation mode is switched.

[0015] In combination with the first aspect, after the step of determining that the current state of the sodium ion energy storage system is a state to be charged and balanced, the method further includes:

[0016] determining whether there is a target second battery cluster with a cluster pressure difference greater than a third pressure difference threshold;

[0017] If yes, if no charge balancing instruction sent by the EMS is received within the set time, the relay and circuit breaker corresponding to the target second battery cluster are cut off;

[0018] The third pressure difference threshold is greater than the first pressure difference threshold.

[0019] In combination with the first aspect, after the step of determining whether there is a first battery cluster whose cluster voltage is greater than the second voltage threshold, the method includes:

[0020] If not, if the charge equalization instruction sent by the EMS is not received within the set time, the current operation mode is maintained and converted to the fault mode.

[0021] In combination with the first aspect, after the step of starting the charging equalization mode in response to the charging equalization instruction input by the user, the method further includes:

[0022] Obtain the voltage of each battery pack in the battery cluster;

[0023] If the voltage is higher than the third voltage threshold, the sodium ion energy storage system is controlled to switch from the charge equalization mode to the operation fault mode.

[0024] In combination with the first aspect, before the step of obtaining the first cluster voltage of each battery cluster in the sodium ion energy storage system, the method further includes:

[0025] In response to the power-on instruction, controlling each battery cluster to complete power-on;

[0026] Conduct inspections on all battery clusters to determine whether the working status of all battery clusters is normal;

[0027] If yes, start normal operation mode.

[0028] In combination with the first aspect, after the step of determining whether the voltage differences of each first cluster are all less than the first voltage threshold, the method further includes:

[0029] If so, determine that the current state of the sodium ion energy storage system is a normal operating state;

[0030] Control the sodium ion energy storage system to maintain the current operating state.

[0031] In a second aspect, the present application provides a control method for a sodium ion energy storage system, which is applied to an EMS unit in the sodium ion energy storage system. The sodium ion energy storage system includes a plurality of battery clusters, each battery cluster is connected to a BMS unit, and the BMS unit is communicatively connected to the EMS unit; the method includes:

[0032] Receive the charge equalization request sent by the BMS unit;

[0033] In response to the user's touch or press operation on the designated confirmation key, a charge equalization instruction is generated and sent to the BMS unit.

[0034] In a third aspect, the present application provides a control device for a sodium ion energy storage system, which is applied to a BMS unit in the sodium ion energy storage system. The sodium ion energy storage system includes a plurality of battery clusters, each of which is connected to the BMS unit; the BMS unit is communicatively connected to the EMS unit; the device includes:

[0035] An acquisition module, used for acquiring a first cluster pressure difference of each battery cluster in the sodium ion energy storage system;

[0036] A judging module, used for judging whether the pressure differences of each first cluster are all less than a first pressure difference threshold;

[0037] A determination module, configured to determine that the current state of the sodium ion energy storage system is a state to be charged and balanced when there is a battery cluster with a voltage difference greater than or equal to the first voltage difference threshold, and send a charge and balance request to the EMS unit;

[0038] The command receiving module is used to start the charge equalization mode if a charge equalization command sent by the EMS unit is received within a set time period;

[0039] A control module, used for obtaining a second cluster voltage difference of each battery cluster, and exiting a charge balancing mode when a plurality of second cluster voltage differences are all less than a second voltage difference threshold;

[0040] The first pressure difference threshold is greater than or equal to the second pressure difference threshold.

[0041] In a fourth aspect, the present application provides a control device for a sodium ion energy storage system, which is applied to an EMS unit in the sodium ion energy storage system. The sodium ion energy storage system includes a plurality of battery clusters, each of which is connected to a BMS unit, and the BMS unit is communicatively connected to the EMS unit; the device includes:

[0042] A request receiving module, used to receive a charge equalization request sent by a BMS unit;

[0043] The response module is used to generate and send a charge equalization instruction to the BMS unit in response to a user's touch or press operation on a designated confirmation key.

[0044] The embodiments of the present invention bring the following beneficial effects: the control method of the sodium ion energy storage system provided by the present application compares the first cluster pressure difference corresponding to each battery cluster with the first pressure difference threshold to determine whether it is in a state to be charged and balanced, and after receiving the charging and balancing instruction, the sodium ion energy storage system is allocated energy until the pressure difference of each cluster meets the working requirements, thereby improving the operating stability and reliability of the sodium ion energy storage system.

[0045] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 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 those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 A schematic flow chart of a control method for a sodium ion energy storage system provided by an embodiment of the present invention;

[0049] Figure 2 A schematic diagram of another control device for a sodium ion energy storage system provided by an embodiment of the present invention;

[0050] Figure 3 A schematic diagram of the structure of a control device for a sodium ion energy storage system provided by an embodiment of the present invention;

[0051] Figure 4 A schematic diagram of the structure of another control device for a sodium ion energy storage system provided by an embodiment of the present invention;

[0052] Figure 5 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.

[0053] Reference numerals:

[0054] 10-acquisition module, 20-judgment module, 30-determination module, 40-instruction receiving module, 50-control module;

[0055] 60-request receiving module, 70-response module;

[0056] 130 - processor, 131 - memory, 132 - bus, 133 - communication interface. DETAILED DESCRIPTION

[0057] 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0058] In order to facilitate the understanding of this embodiment, the technical terms designed in this application are briefly introduced below.

[0059] BMS (Battery Management System) is a battery management system. BMS is a device that monitors the status of energy storage batteries. It is mainly used to intelligently manage and maintain each battery unit, prevent overcharging and over-discharging of the battery, extend the battery life, and monitor the battery status. Generally, BMS is a circuit board, namely a BMS protection board, or a hardware box.

[0060] After introducing the technical terms involved in this application, the application scenarios and design concepts of the embodiments of this application are briefly introduced.

[0061] Based on this, an embodiment of the present application provides a control method for a sodium ion energy storage system.

[0062] Example 1

[0063] The present application provides a control method for a sodium ion energy storage system, which is applied to a BMS unit in the sodium ion energy storage system. The sodium ion energy storage system includes a plurality of battery clusters, each of which is connected to a BMS unit; and the BMS unit is in communication connection with an EMS unit. Figure 1 As shown, the method includes:

[0064] S110, obtaining a first cluster pressure difference of each battery cluster in the sodium ion energy storage system.

[0065] S120: Determine whether the pressure differences of each first cluster are all smaller than a first threshold.

[0066] If yes, execute steps S130 - S140 ; ​​if no, execute steps S150 - S170 .

[0067] S130, determining that the current state of the sodium ion energy storage system is a normal operating state.

[0068] S140, controlling the sodium ion energy storage system to maintain the current operating state.

[0069] S150, determining that the current state of the sodium ion energy storage system is a state to be charged and balanced, and sending a charge and balance request to the EMS unit.

[0070] S160, if a charge balancing instruction sent by the EMS unit is received within the set time, the charge balancing mode is started.

[0071] S170, obtaining a second cluster voltage difference of each battery cluster, and exiting the charge balancing mode when a plurality of second cluster voltage differences are all smaller than a second voltage difference threshold.

[0072] The first pressure difference threshold is greater than or equal to the second pressure difference threshold.

[0073] The control method of the sodium ion energy storage system provided in the present application determines the first cluster pressure difference of each battery cluster. When there is a battery cluster with a pressure difference greater than the first pressure difference threshold and the user confirms to execute the charge equalization function, the sodium ion energy storage system is allocated energy storage until the cluster pressure difference corresponding to each battery cluster meets the working requirements, thereby improving the operating stability and reliability of the sodium ion energy storage system.

[0074] It can be understood that the sodium ion energy storage system includes multiple battery clusters, each battery cluster includes multiple battery packs, and in step S110, the cluster voltage of each battery cluster is first obtained, and then, for each battery cluster, the highest cluster voltage is subtracted from the cluster voltage of the battery cluster to obtain the first cluster voltage difference of the battery cluster. In this way, the first cluster voltage difference corresponding to each battery cluster can be obtained.

[0075] In step S120, the first threshold is preset according to actual working needs. It can be understood that the smaller the cluster pressure difference between battery clusters, the better. Therefore, each first cluster pressure difference is compared with the first threshold to determine whether the first cluster pressure difference corresponding to each battery cluster meets the actual working requirements. It can be understood that if (that is, the first cluster pressure difference of each battery cluster meets the actual working requirements), then executing step S130 can be considered that each battery cluster does not need to be charged, and the cluster pressure difference of each battery cluster is small and stable, and continuous operation is sufficient. Otherwise, executing step S150 determines that there are battery clusters that need to be charged in the sodium ion energy storage system.

[0076] Then the BMS sends a charge balancing request to the EMS. In step S160, after the user confirms (by touching, clicking, or pressing a function key), a charge balancing instruction is input to the BMS unit to start a charge balancing mode to charge each battery cluster. In step S170, the cluster pressure difference of each battery cluster is obtained again to obtain multiple second cluster pressure differences. When the cluster pressure difference is less than the second pressure difference threshold, it is confirmed that the charge balancing is completed and the charge balancing mode is exited.

[0077] In this embodiment, the first voltage difference threshold is 20V, and the second voltage difference threshold is 15V.

[0078] In combination with the first aspect, step S160 includes:

[0079] S161 , sorting the battery clusters in ascending order based on the first cluster voltage corresponding to each battery cluster.

[0080] S162 , closing the relays corresponding to the battery clusters in ascending order, and charging the battery clusters with a specified current until the third cluster voltage difference of each battery cluster is less than the first voltage difference threshold.

[0081] S163, when the relays corresponding to all battery clusters are in a closed state, the charging balancing mode is exited and switched to a normal operation mode.

[0082] In this embodiment, the multiple battery clusters are sorted according to the ascending order of the cluster voltages in the multiple battery clusters. It can be understood that the battery cluster with the smallest cluster voltage has the largest cluster voltage difference, and the battery cluster should be charged and balanced first. Therefore, each battery cluster is charged and balanced in turn according to the obtained ascending order. The specific adjustment method for any battery cluster is: turn off the relay corresponding to the battery cluster, and perform maintenance charging on the battery cluster with a specified small current, then obtain the cluster voltage of each battery cluster after charging, and then calculate the third cluster voltage difference of each battery cluster, and compare each third cluster voltage difference with the second voltage difference threshold again, until each third cluster voltage difference is less than the second voltage difference threshold, the cluster voltages between the battery clusters are relatively balanced, and at this time, the charging and balancing mode can be exited. Among them, the value range of the second cluster voltage difference threshold is 12-18V, and the value of the second cluster voltage difference threshold in this embodiment is 15V.

[0083] In addition, during the charge balancing adjustment process, when the cluster voltage of the current battery cluster after charging is close to the current cluster voltage of the next battery cluster, the relay corresponding to the next battery cluster is turned off. For example, there are 8 battery clusters, namely: A1, A2...A8, and their corresponding cluster voltages are U1, U2...U8 respectively. The result of sorting the battery clusters in ascending order according to the corresponding cluster voltages is: A2, A4, A6, A8, A1, A3, A5, A7. In combination with the above example, the relay corresponding to the A2 battery cluster should be turned off first, and the A2 battery cluster should be charged and maintained with a specified small current until the charged U2' approaches U4, and the relay corresponding to the A4 battery cluster is turned off to start charging and maintaining the A4 battery cluster with a specified small current, until the charged U4' approaches U6, and the relay corresponding to the A6 battery cluster is turned off to start charging and maintaining the A6 battery cluster with a specified small current... and so on, until the relay corresponding to the A7 battery cluster is turned off (that is, the relays corresponding to all battery clusters are in a closed state), the charge balancing mode is exited, and the normal operation mode is converted.

[0084] It can be understood that after step S162, the following steps are also included:

[0085] S164, receiving a charge balancing termination instruction sent by the EMS, and controlling one or more battery clusters whose relays are in a closed state to switch from a charge balancing mode to a normal operating mode.

[0086] In this embodiment, if the EMS sends a charge balancing termination instruction to the BMS unit after entering the charge balancing mode, the charge balancing mode can be terminated.

[0087] It can be understood that after step S162, the following steps are also included:

[0088] S165, obtaining operating parameters of the battery cells in each battery cluster, wherein the operating parameters include at least voltage, current, and temperature.

[0089] S166: If the operating parameters are abnormal, exit the charge balancing mode.

[0090] That is, the charge balancing mode is still protected by the threshold value, and the working parameters of the battery cells in each battery cluster are collected in real time during the charge balancing process, wherein the working parameters include at least voltage, current, temperature, insulation withstand voltage, etc., and each parameter corresponds to a preset parameter alarm threshold, such as the battery cell charging voltage threshold (in the present embodiment, the value range is 1.8V-3.3V). When any of the above working parameters reaches the alarm threshold, it means that the working parameter is abnormal. At this time, charging is stopped in time to maintain the stability of the system.

[0091] In combination with the first aspect, after step S150, the method further includes:

[0092] S151, obtaining the number of battery clusters whose first cluster voltage difference is less than a first voltage difference threshold.

[0093] S152: If the number of battery clusters is greater than a preset number threshold, and the faulty battery cluster whose first cluster voltage difference is greater than or equal to the first voltage difference threshold is in a cut-off state, the state to be charged and balanced is converted to a normal operation state.

[0094] In this embodiment, whether the system can operate normally is determined by combining the number of battery clusters whose voltage difference is less than the first voltage difference threshold and the status of the faulty battery clusters whose voltage difference is greater than or equal to the first voltage difference threshold.

[0095] In combination with the above example, that is, when the number of battery clusters with a first cluster voltage difference <20V (such as 5) is greater than or equal to 2, and the faulty battery clusters with a first cluster voltage difference ≥20V are all in a cut-off state, normal operation can continue.

[0096] After step S150 in the first aspect, the method further includes:

[0097] S153, determining whether there is a target second battery cluster whose cluster pressure difference is greater than a third pressure difference threshold.

[0098] If so, execute step S154.

[0099] S154: If no charge balancing instruction is received from the EMS within the set time, the relay and the circuit breaker corresponding to the target second battery cluster are disconnected.

[0100] The third pressure difference threshold is greater than the first pressure difference threshold.

[0101] If there is a battery cluster whose cluster voltage difference is greater than the third voltage difference threshold, it indicates that the cluster voltage of the battery cluster is large. If it is not maintained in time, it may cause overcharging and over-discharging to damage the battery cell. Circulation may also be generated between the battery clusters to reduce the safety of the system. At this time, the extremely low voltage cluster needs to be powered on in time to supplement the voltage to maintain the operation stability of the sodium ion energy storage system. At this time, the BMS sends a forced charging equalization request to the EMS. On the premise that the user confirms that there are no other safety hazards or faults, the EMS determines that it can enter the forced charging equalization mode, and then sends a charging equalization instruction to the BMS. After receiving the charging equalization instruction, the BMS executes steps S160-S170 to perform charging equalization adjustment; if the user confirms that there are still other safety hazards or faults, the EMS determines that it cannot enter the forced charging equalization mode at this time, that is, the user still does not confirm the execution of charging balance within the set time (such as 30s), then the sodium ion energy storage system is very likely to fail during operation. At this time, the relay and circuit breaker corresponding to the target second battery cluster whose cluster voltage difference is greater than the third voltage difference threshold should be cut off, and it is necessary to manually check the battery status in real time and handle abnormal situations. In this process, the multi-level warnings of the BMS unit (such as level 1, level 2, and level 3 warnings) are ignored. In this embodiment, the third voltage difference threshold is 80V.

[0102] In combination with the first aspect, after step S153, the method further includes:

[0103] If not, execute step S155.

[0104] S155, if the charging equalization instruction sent by the EMS is not received within the set time, the current operation mode is maintained and converted to the fault mode.

[0105] In this embodiment, although there are battery clusters with a cluster voltage difference greater than the first voltage difference threshold, there is no voltage difference greater than the third voltage difference threshold. Combined with the above example, the voltage difference of each cluster is between 20V and 80V. Although there are battery clusters that need to be charged, they have not yet caused too much adverse impact on the operation of the sodium ion energy storage system. The cluster voltage difference can be eliminated in other power-on steps after power-on is completed. This step is intended to supplement the situation where a forced fault will occur when the cluster voltage difference is greater than 80V, and completing balancing before power-on can greatly reduce the charging time.

[0106] In combination with the first aspect, after step S150, the method further includes:

[0107] S1601, obtaining the voltage of each battery pack in the battery cluster.

[0108] S1602: If the voltage is higher than a third voltage threshold, the sodium ion energy storage system is controlled to switch from a charge balancing mode to an operation fault mode.

[0109] During the operation of the sodium-ion energy storage system, the voltage of each battery pack in the battery cluster is monitored. If the voltage is abnormal, it switches to the operation fault mode to serve as a warning. The voltage includes but is not limited to the voltage of a single battery pack and the voltage of the entire battery cluster composed of multiple battery packs.

[0110] In combination with the first aspect, before step S110, the method further includes:

[0111] In response to the power-on instruction, controlling each battery cluster to complete power-on;

[0112] Conduct inspections on all battery clusters to determine whether the working status of all battery clusters is normal;

[0113] If yes, start normal operation mode.

[0114] During the initial operation stage of the sodium-ion energy storage system, each battery cluster is inspected to determine the working status of each battery cluster. If the dimensions of each point are in normal working condition, it will operate normally.

[0115] In a second aspect, an embodiment of the present application provides a control method for a sodium ion energy storage system, which is applied to an EMS unit in the sodium ion energy storage system. The sodium ion energy storage system includes a plurality of battery clusters, each of which is connected to a BMS unit, and the BMS unit is in communication connection with the EMS unit. Figure 2 As shown, the method includes:

[0116] S210, receiving a charge balancing request sent by a BMS unit.

[0117] S220 , in response to the user touching or pressing the designated confirmation key, generating and sending a charge equalization instruction to the BMS unit.

[0118] In this embodiment, when the BMS determines that charging equalization is required based on the comparison of the cluster pressure difference of each battery cluster with the first pressure difference threshold, it sends a charging equalization request to the EMS unit. At this time, the EMS unit receives the charging equalization request and waits for user confirmation. If the user touches or presses the preset confirmation key, it means that the user confirms to perform charging equalization. At this time, the EMS unit generates a charging equalization instruction and sends it to the BMS unit to adjust the charging equalization of the sodium ion energy storage system.

[0119] In a third aspect, the present application provides a control device for a sodium ion energy storage system, which is applied to a BMS unit in the sodium ion energy storage system. The sodium ion energy storage system includes a plurality of battery clusters, each of which is connected to a BMS unit; and the BMS unit is in communication connection with an EMS unit. Figure 3 As shown, the device includes: an acquisition module 10, a judgment module 20, a determination module 30, an instruction receiving module 40 and a control module 50.

[0120] The acquisition module 10 is used to acquire the first cluster voltage of each battery cluster in the sodium ion energy storage system.

[0121] The determination module 20 is used to determine whether the voltages of each first cluster are all less than a first voltage threshold.

[0122] The determination module 30 is used to determine that the current state of the sodium ion energy storage system is a state to be charged and balanced when there is a battery cluster whose first cluster voltage is greater than or equal to the first voltage threshold.

[0123] The instruction receiving module 40 is used to start the charging equalization mode if a charging equalization instruction sent by the EMS is received within a set time period.

[0124] The control module 50 is used for acquiring the second cluster voltage difference of each battery cluster, and exiting the charge balancing mode when the plurality of second cluster voltage differences are all smaller than the second voltage difference threshold.

[0125] The first pressure difference threshold is greater than or equal to the second pressure difference threshold.

[0126] In a fourth aspect, an embodiment of the present application provides another control device for a sodium ion energy storage system, which is used for an EMS unit in a sodium ion energy storage system, wherein the sodium ion energy storage system includes a plurality of battery clusters, each battery cluster is connected to a BMS unit, and the BMS unit is communicatively connected to the EMS unit; Figure 4 As shown, the device includes: a request receiving module 60 and a response module 70.

[0127] The request receiving module 60 is used to receive a charge equalization request sent by the BMS unit.

[0128] The response module 70 is used to generate and send a charge equalization instruction to the BMS unit in response to a user's touch or press operation on a designated confirmation key.

[0129] In a fifth aspect, an embodiment of the present application provides an electronic device, Figure 5 As shown, the electronic device includes a memory 131 and a processor 130. The memory 131 is used to store computer programs, and the processor 130 runs the computer programs to enable the electronic device to perform the above method.

[0130] Furthermore, combined with Figure 5 The electronic device shown further includes a bus 132 and a communication interface 133 , and the processor 130 , the communication interface 133 and the memory 131 are connected via the bus 132 .

[0131] The memory 131 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 133 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used. The bus 132 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.

[0132] The processor 130 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 130. The above processor 130 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-purpose 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 131, and the processor 130 reads the information in the memory 131 and completes the steps of the method of the above embodiment in combination with its hardware.

[0133] In a sixth aspect, an embodiment of the present application provides a readable storage medium, in which computer program instructions are stored. When the computer program instructions are read and executed by a processor, the above method is executed.

[0134] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0135] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0136] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. 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 a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of 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.

[0137] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0138] Finally, it should be noted that the above 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 embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions recorded in the above 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 control method for a sodium ion energy storage system, characterized in that: A BMS unit applied to a sodium ion energy storage system, wherein the sodium ion energy storage system comprises a plurality of battery clusters, each of which is connected to a BMS unit; the BMS unit is communicatively connected to an EMS unit; and the method comprises: Obtaining a first cluster pressure difference of each battery cluster in the sodium ion energy storage system; Determining whether the pressure differences of each of the first clusters are less than a first pressure difference threshold; If not, determining that the current state of the sodium ion energy storage system is a state to be charged and balanced, and sending a charge and balance request to the EMS unit; If a charge equalization instruction sent by the EMS unit is received within a set time, a charge equalization mode is started; Acquiring a second cluster voltage difference of each of the battery clusters, and, when a plurality of the second cluster voltage differences are all less than a second voltage difference threshold, exiting the charge balancing mode; The first pressure difference threshold is greater than or equal to the second pressure difference threshold.

2. The method according to claim 1, characterized in that In response to a charge equalization instruction input by a user, the step of starting a charge equalization mode includes: In combination with the first cluster voltage corresponding to each of the battery clusters, sorting the battery clusters in ascending order; Based on the ascending order, the relays corresponding to the battery clusters are closed in sequence, and the battery clusters are charged with a specified current until the third cluster voltage difference of each battery cluster is less than the first voltage difference threshold; When the relays corresponding to all the battery clusters are in a closed state, the charging balancing mode is exited and switched to a normal operating mode.

3. The method according to claim 1, characterized in that After the step of determining that the current state of the sodium ion energy storage system is a state to be charged and balanced, the method further includes: Determine whether there is a target second battery cluster whose cluster pressure difference is greater than a third pressure difference threshold; If yes, if no charge balancing instruction sent by the EMS is received within the set time, disconnecting the relay and the circuit breaker corresponding to the target second battery cluster; Wherein, the third pressure difference threshold is greater than the first pressure difference threshold.

4. The method according to claim 1, characterized in that: After the step of determining whether there is a first battery cluster having a cluster voltage greater than a second voltage threshold, the method includes: If not, if the charge equalization instruction sent by the EMS is not received within the set time, the current operation mode is maintained and converted to the fault mode.

5. The method according to claim 3, characterized in that: After the step of starting the charging equalization mode in response to the charging equalization instruction input by the user, the method further includes: Acquiring the voltage of each battery pack in the battery cluster; If the voltage is higher than a third voltage threshold, the sodium ion energy storage system is controlled to switch from the charge equalization mode to the operation fault mode.

6. The method according to claim 3, characterized in that Before the step of obtaining the first cluster voltage of each battery cluster in the sodium ion energy storage system, the step further includes: In response to the power-on instruction, controlling each battery cluster to complete power-on; Performing inspection on all the battery clusters to determine whether the working status of all the battery clusters are normal; If yes, start normal operation mode.

7. The method according to claim 1, characterized in that After the step of determining whether the voltage differences of each of the first clusters are all less than the first voltage threshold, the method further includes: If yes, determining that the current state of the sodium ion energy storage system is a normal operating state; The sodium ion energy storage system is controlled to maintain a current operating state.

8. A control method for a sodium ion energy storage system, characterized in that: An EMS unit applied to a sodium ion energy storage system, wherein the sodium ion energy storage system comprises a plurality of battery clusters, each of which is connected to a BMS unit, and the BMS unit is communicatively connected to the EMS unit; the method comprises: Receive the charge equalization request sent by the BMS unit; In response to a user's touch or press operation on a designated confirmation key, a charge equalization instruction is generated and sent to the BMS unit.

9. A control device for a sodium ion energy storage system, characterized in that: A BMS unit applied to a sodium ion energy storage system, wherein the sodium ion energy storage system comprises a plurality of battery clusters, each of which is connected to a BMS unit; the BMS unit is communicatively connected to an EMS unit; the device comprises: An acquisition module, used for acquiring a first cluster pressure difference of each battery cluster in the sodium ion energy storage system; A judging module, configured to judge whether the pressure differences of each of the first clusters are all less than a first pressure difference threshold; A determination module, configured to determine that the current state of the sodium ion energy storage system is a state to be charged and balanced when there is a battery cluster with a voltage difference greater than or equal to the first voltage difference threshold, and send a charge and balance request to the EMS unit; The command receiving module is used to start the charge equalization mode if a charge equalization command sent by the EMS unit is received within a set time period; a control module, configured to obtain a second cluster voltage difference of each of the battery clusters, and exit the charge balancing mode when a plurality of the second cluster voltage differences are all less than a second voltage difference threshold; The first pressure difference threshold is greater than or equal to the second pressure difference threshold.

10. A control device for a sodium ion energy storage system, characterized in that: An EMS unit used in a sodium ion energy storage system, the sodium ion energy storage system comprising a plurality of battery clusters, each of which is connected to a BMS unit, and the BMS unit is communicatively connected to the EMS unit; the device comprises: A request receiving module, used to receive a charge equalization request sent by a BMS unit; The response module is used to generate and send a charge equalization instruction to the BMS unit in response to a user's touch or press operation on a designated confirmation key.

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