A power compensation device and method for an energy storage system

Abstract

This application provides a power replenishment device and method for an energy storage system. The power replenishment device includes a power replenishment control circuit for connecting a battery pack to an inverter, and a power supply control circuit for connecting a slave processor to an auxiliary power supply. The auxiliary power supply supplies power to the main processor and / or supplies power to the slave processor through the power supply control circuit. The main processor sends first information to the inverter and obtains a first instruction based on the first information. The slave processor obtains first information about its own slave battery cluster and sends it to the main processor, and controls the power replenishment control circuit and power supply control circuit of its own slave battery cluster according to the first instruction. The inverter replenishes the battery packs of its own battery cluster based on the first information through either the main battery management system or the slave battery management system. This power replenishment structure can achieve precise power replenishment of battery packs in each battery cluster, while completely avoiding the operational risks and voltage imbalance problems caused by manual intervention.

Description

Technical Field

[0001] This application relates to the field of energy storage system technology, specifically to a power replenishment structure and method for an energy storage system. Background Technology

[0002] In the design of the high-voltage box of a high-voltage energy storage system (HV-ESS), in order to save costs, the system usually does not configure an additional independent power supply to power the BMS (Battery Management System) control board. When the battery pack is extremely over-discharged and the voltage is lower than the minimum operating threshold of the BMS, a "board-level deadlock" phenomenon will occur - the BMS cannot start due to power failure. As the control center of the charging and discharging circuit, the high-voltage box's relay closing authority depends on the instructions of the BMS, forming a logical closed loop.

[0003] In the normal operation of high-voltage residential solar energy storage systems, it is generally recommended to keep the depth of discharge (DOD) of the battery below 90% (corresponding to a single cell voltage of approximately 3.0V) to balance cycle life and system economy. However, in off-grid photovoltaic energy storage systems, users often have a rigid demand for deep discharge when encountering sustained high loads or extreme weather. In this case, the high-voltage residential solar energy storage system may be forced to operate at close to 100% DOD (corresponding to a single cell voltage of approximately 2.6V). When the BMS detects that the voltage is too low and cannot be charged for a period of time, in order to reduce power consumption and prevent further draining of battery power, a common approach is to enter a low-power mode. However, when the battery is at zero charge, the battery's self-discharge will cause the voltage to drop sharply. In some high-voltage systems with low voltage series counts, the BMS may easily fail to start up.

[0004] In the energy storage system industry, the most common solution to the problem of BMS failure due to deep battery discharge is manual recharging. This involves using an external DC power source (such as a portable charger) to recharge each battery in the battery pack individually until the voltage returns to the BMS startup threshold. While simple and direct, this method has significant limitations: the operation is cumbersome and time-consuming, especially in multi-cluster parallel systems where each cluster needs to be operated individually, leading to low efficiency and safety hazards associated with working with live wires. Another common solution is to integrate an independent recharging circuit within the high-voltage box, directly powering the BMS through a dedicated interface. However, in practical applications, in extreme cases where multiple high-voltage boxes and multi-cluster parallel systems are completely locked, manual recharging of each cluster is still required, making automation impossible.

[0005] More challenging is the difficulty in precisely controlling the charging duration for each cluster manually. Ending the charging too early may prevent the BMS from waking up, while ending it too late can lead to voltage inconsistencies between clusters, affecting the overall system balance and creating safety hazards for subsequent operation. Furthermore, under extremely low-voltage conditions, high-current charging can directly exacerbate lithium plating reactions within the lithium-ion battery. When the battery voltage drops below 2.5V, the graphite layered structure of the negative electrode has already collapsed. At this point, a high current forces lithium ions to deposit irregularly on the negative electrode surface, increasing the risk of dendrite formation by 3-5 times compared to normal conditions. To ensure safety during manual operation, the minimum charging current recommended by the cell manufacturer for low-voltage conditions is generally used throughout, resulting in low efficiency. Both of these traditional solutions face common problems such as insufficient automation, high operational risks, and low efficiency, making it difficult to meet the rapid recovery requirements of large-scale energy storage systems. Summary of the Invention

[0006] This application addresses the problems existing in the prior art by providing a power replenishment structure and method for high-voltage household energy storage parallel systems that can achieve precise power replenishment of at least one battery pack in each battery cluster, while completely avoiding the operational risks and voltage imbalance problems caused by manual intervention.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0008] In a first aspect, embodiments of this application propose a power replenishment device for an energy storage system. The energy storage system includes a converter, a main battery cluster comprising a main battery management system and a battery pack, and a slave battery cluster comprising a slave battery management system and a battery pack. The main battery management system includes a main processor, and the slave battery management system includes a slave processor connected in parallel with the main processor and connected to the converter. The main processor is communicatively connected to both the converter and the slave processor. The power replenishment device includes:

[0009] The power supply control circuit and the main battery pack are connected to the inverter via the power supply control circuit. The auxiliary power supply is used to supply power to the main processor and / or to the slave processor via the power supply control circuit.

[0010] The main processor is used to obtain a first instruction based on the first information; the first information includes a first sub-information representing the maximum limit of the current charging current of the main battery cluster or slave battery cluster that needs to be charged; the first instruction includes a first sub-instruction representing the connection of the charging control circuit of the main battery cluster or slave battery cluster, and a second sub-instruction representing the disconnection of the charging control circuit of the main battery cluster or slave battery cluster and the connection of the power supply control circuit of the main battery cluster or slave battery cluster; the slave processor is used to control the charging control circuit and the power supply control circuit of the slave battery cluster respectively according to the first instruction; the inverter is used to charge the battery pack of the main battery cluster or slave battery cluster respectively through the main battery management system or the slave battery management system based on the first information.

[0011] In some embodiments, the battery packs of the main battery cluster and the battery packs of the slave battery cluster are respectively connected to the inverter via a power supply control circuit, including:

[0012] The battery packs of the main battery cluster and the battery packs of the secondary battery cluster are connected to the inverter through a power supply control circuit.

[0013] The auxiliary power supply provides power to the slave processor through a power supply control circuit, including:

[0014] When there are at least two slave processors, each slave processor is connected in series with the auxiliary power supply through a power supply control circuit.

[0015] In some embodiments, the power supply control circuit includes:

[0016] A power supply control switch; the battery packs of the main battery cluster and the battery packs of the slave battery cluster are connected to the inverter via the power supply control switch; the power supply control switch is also connected to the main processor or the slave processor;

[0017] The main processor or slave processor is also used to control the closing and opening of the corresponding power supply control switch respectively;

[0018] When the power supply control switch is closed, the inverter is used to supply power to the corresponding main battery cluster or the battery pack of the slave battery cluster via the closed power supply control switch.

[0019] In some embodiments, the power supply control circuit includes:

[0020] Power supply control switch; each slave processor is connected in series with the auxiliary power supply via a power supply control switch, and the power supply control switch is also connected to the master processor or slave processor;

[0021] The main processor or slave processor is also used to control the closing and opening of the corresponding power supply control switches respectively;

[0022] With the power supply control switch closed, the auxiliary power supply is used to supply power to the slave processor through the closed power supply control circuit.

[0023] In some embodiments, the first information further includes second sub-information, which includes being in a first state, being in a second state, and being in a third state. Being in the first state indicates that the battery cluster is in a state where charging has not started, being in the second state indicates that the battery cluster is in a state where charging is in progress, and being in the third state indicates that the battery cluster is in a state where charging is complete. The battery cluster indicates a main battery cluster or a slave battery cluster.

[0024] The main processor is used to send the first sub-information of each battery cluster to the converter;

[0025] The main processor is used to obtain the first instruction of each battery cluster based on the second sub-information of each battery cluster.

[0026] The inverter is used to replenish the battery pack of the battery cluster based on the first sub-information, either through the main battery management system or the slave battery management system.

[0027] In some embodiments, the second sub-information also includes being in a fourth state, which indicates that the battery cluster is in a faulty state;

[0028] When the second sub-information is in the fourth state, the energy storage system jumps to the fifth state. The fifth state represents the state when the main processor recognizes the second instruction, and the second instruction represents the power replenishment start instruction.

[0029] In some embodiments, the battery pack of the main battery cluster and the battery pack of the slave battery cluster are respectively connected to the inverter through a power supply control circuit, including: the battery pack of the main battery cluster and the battery pack of the slave battery cluster are respectively connected in series to the inverter through a power supply control circuit.

[0030] The auxiliary power supply supplies power to the main processor and / or supplies power to the slave processor through the power supply control circuit, including: the main processor and the slave processor are respectively connected in parallel or in series to the auxiliary power supply through the power supply control circuit;

[0031] or:

[0032] The battery packs of the main battery cluster and the battery packs of the slave battery cluster are respectively connected to the inverter through a power supply control circuit, including: the battery packs of the main battery cluster and the battery packs of the slave battery cluster are respectively connected to the inverter through a power supply control circuit.

[0033] The auxiliary power supply supplies power to the main processor and / or supplies power to the slave processor through a power supply control circuit, including: the main processor and the slave processor are respectively connected to the auxiliary power supply through the power supply control circuit.

[0034] Secondly, embodiments of this application propose a method for replenishing power to an energy storage system, which is implemented using a power replenishment device for the energy storage system. The power replenishment method includes:

[0035] The main battery management system or the battery management system obtains the first information of the battery cluster and sends it to the main processor. The battery cluster represents the main battery cluster or the battery cluster.

[0036] The main processor obtains the first instruction for each battery cluster based on the first information of each battery cluster; the main processor sends the first information of each battery cluster to the inverter;

[0037] The main battery management system or the slave battery management system executes the corresponding first sub-instruction based on the first information, and the inverter replenishes the battery pack of its battery cluster with power through the main battery management system or the slave battery management system based on the first information; or

[0038] The main battery management system or the slave battery management system executes the corresponding second sub-instruction based on the first information.

[0039] In some embodiments, the main battery management system or the slave battery management system executes a corresponding first sub-instruction based on the first information, and the inverter replenishes the battery pack of its battery cluster with power through the main battery management system or the slave battery management system based on the first information; or the main battery management system or the slave battery management system executes a corresponding second sub-instruction based on the first information, including:

[0040] Initialize the current charging sequence number, which is the sequence number of the battery cluster along the sequential connection direction, and let... , This is the current power replenishment sequence number;

[0041] When the second sub-information of the battery cluster corresponding to the current power replenishment sequence number is in the first state, the main processor sends the first sub-instruction to the main processor or slave processor corresponding to the current power replenishment sequence number.

[0042] The master or slave processor corresponding to the current power-up sequence number executes the first sub-instruction;

[0043] The converter replenishes the battery pack of the battery cluster based on the first sub-information through the main processor or slave processor corresponding to the current replenishment sequence number;

[0044] When the second sub-information of the battery cluster corresponding to the current power replenishment sequence number is in the third state, the main processor sends the second sub-instruction to the main processor or slave processor corresponding to the current power replenishment sequence number.

[0045] The master or slave processor corresponding to the current power-up sequence number executes the second sub-instruction and instructs... ;

[0046] when hour, Given the total number of battery clusters, repeatedly execute the following: when the second sub-information of the battery cluster corresponding to the current power replenishment sequence number is in the first state, the main processor sends the first sub-instruction to the main processor or slave processor corresponding to the current power replenishment sequence number.

[0047] when At that time, the power replenishment will end.

[0048] In some embodiments, when the total battery voltage of the battery cluster corresponding to the current charging sequence number is not lower than the charging voltage threshold, the second sub-information is in the third state.

[0049] Compared with the prior art, this application has the following advantages:

[0050] This application connects an auxiliary power source during power replenishment. By supplying power to the main processor and / or to the slave processor through the power control circuit, the main battery management system or the slave battery management system monitors the power replenishment status and sends it to the main processor to update the power replenishment control command. Based on the power replenishment energy and the first command, the inverter replenishes the battery packs in each battery cluster sequentially along the sequential connection direction through the power replenishment control circuit. This can achieve precise power replenishment of the battery packs in each battery cluster, while completely avoiding the operational risks and voltage imbalance problems caused by manual intervention. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the power replenishment device applied to the energy storage system in Embodiment 1 of this application. Figure I ;

[0052] Figure 2 This is a schematic diagram of the power replenishment device applied to the energy storage system in Embodiment 1 of this application. Figure II ;

[0053] Figure 3 This is a schematic flowchart of the power replenishment method applied to the energy storage system in Embodiment 1 of this application;

[0054] Figure 4 This is a flowchart illustrating the process of obtaining the first information of the battery cluster from the main battery management system or the battery management system in Embodiment 1 of this application.

[0055] Figure 5 This is a flowchart illustrating the power replenishment procedure in Embodiment 1 of this application.

[0056] The reference numerals in the attached diagram are as follows: 110, inverter; 120, main battery cluster; 121, main battery management system; 1211, main processor; 130, slave battery cluster; 131, slave battery management system; 1311, slave processor; 140, battery pack; 150, first interface; 160, second interface; 200, DC bus; 310, supplementary power control circuit; 320, power supply control circuit; 410, first CAN bus; 420, second CAN bus. Detailed Implementation

[0057] To clearly illustrate the technical features of this solution, the implementation methods of this application will be described in detail below with reference to the accompanying drawings and embodiments. This will allow for a full understanding and implementation of how this application uses technical means to solve technical problems and achieve corresponding technical effects. The embodiments of this application and the various features within them can be combined with each other without conflict, and the resulting technical solutions are all within the protection scope of this application.

[0058] Example 1

[0059] See Figure 1 In a first aspect, embodiments of this application propose a power replenishment device for an energy storage system. The energy storage system includes a converter 110, a main battery cluster 120, and at least one slave battery cluster 130. The main battery cluster 120 includes a main battery management system 121 and at least one battery pack 140. Each slave battery cluster 130 includes at least one battery pack 140 and a slave battery management system 131. Both the main battery cluster 120 and each slave battery cluster 130 include multiple battery packs 140. The multiple battery packs in each battery cluster are connected in series and / or in parallel. A battery cluster represents either the main battery cluster 120 or a slave battery cluster. 130. The main battery management system 121 includes a main processor 1211, and the slave battery management system 131 includes a slave processor 1311. The main processor 1211 is communicatively connected to the inverter 110 and the slave processor 1311 via a CAN (Controller Area Network) bus. The CAN bus includes a first CAN bus 410 and a second CAN bus 420. The main processor 1211 and the slave processor 1311 communicate via the first CAN bus 410, and the main processor 1211 and the inverter 110 communicate via the second CAN bus 420. The main processor 1211 and the slave processor 1311 are connected in parallel to the inverter 110. Specifically, the main processor 1211 and the slave processor 1311 are connected in parallel to the inverter 110 via a DC bus 200. The charging device includes:

[0060] Power supply control circuit 310 and power supply control circuit 320;

[0061] The battery pack 140 of the main battery cluster 120 and the battery pack 140 of each slave battery cluster 130 are respectively connected to the inverter 110 through the power supply control circuit 310. During normal operation, the power supply control circuit 310 is turned on and used to perform the charging and discharging function of the energy storage system. Each slave processor 1311 is connected to the auxiliary power supply through the power supply control circuit 320, and the main processor 1211 is connected to the auxiliary power supply.

[0062] The auxiliary power supply is used to supply power to the main processor 1211 and / or to the slave processor 1311 through the power supply control circuit 320. The auxiliary power supply is used to connect to the main processor 1211 and also to connect to the power supply control circuit 320 of the battery cluster where the main processor 1211 is located. The output power of the auxiliary power supply is not less than the operating voltage of the main processor 1211 and any slave processor 1311, ensuring that the main processor 1211 or each slave processor 1311 can start normally.

[0063] The main processor 1211 is used to send the first information to the inverter 110, and the main processor 1211 is also used to obtain a first instruction based on the first information. The first instruction is a power supply control instruction. The first instruction includes a first sub-instruction and a second sub-instruction. The first sub-instruction is to turn on the power supply control circuit 310 of the battery cluster, and the second sub-instruction is to turn off the power supply control circuit 310 of the battery cluster and turn on the power supply control circuit 320 of the battery cluster.

[0064] The slave processor 1311 obtains the first information of its battery cluster and sends it to the master processor 1211. The master processor 1211 also obtains the first information of its battery cluster. The master processor 1211 has the function of identifying each slave processor 1311. It can identify different slave processors 1311 through communication automatic addressing, DIP switches, etc., to correspond to the first information of different battery clusters. In addition, the master processor 1211 also has a power-off storage medium function to record the total number of battery clusters in the energy storage system in the last time, which facilitates the management of the power replenishment program.

[0065] The inverter 110 is used to replenish power to at least one battery pack 140 of the battery cluster based on the first information via the main battery management system or the slave battery management system. The main processor 1211 and the slave processor 1311 are both used to execute the first instruction.

[0066] When the main processor 1211 is connected to the auxiliary power supply control circuit 320, the auxiliary power supply supplies power to both the main processor 1211 and the power supply control circuit 320. During the power replenishment process, when the main processor 1211 or the slave processor 1311 detects the auxiliary power supply connection, it begins to collect the first information of the battery cluster and sends it to the main processor 1211. The main processor 1211 sends the first information to the inverter 110 and obtains the first instruction based on the first information. The main battery management system or the slave battery management system first executes the first sub-instruction, that is, the power replenishment control circuit 310 of the battery cluster where the main battery management system or the slave battery management system is located is turned on. Based on the first information, the inverter 110 replenishes power to at least one battery pack 140 of the battery cluster through the main battery management system or the slave battery management system. In other words, the inverter 110 supplies power to the battery cluster through the main battery management system or the slave battery management system according to the maximum limited power replenishment current. The replenishment current output by at least one battery pack 140 of the cluster is strictly controlled within the safest range, which is most beneficial to the lifespan of the battery cluster or battery pack. After the main battery management system or the slave battery management system completes the replenishment of the battery cluster, the main battery management system or the slave battery management system executes the second sub-instruction, that is, the replenishment control circuit 310 of the battery cluster where the main battery management system or the slave battery management system is located is disconnected and the power supply control circuit 320 is turned on. The main battery management system or the slave battery management system connected to the auxiliary power supply through the turned-on power supply control circuit 320 begins to collect the first information of the battery cluster and sends it to the main processor 1211, thereby realizing the replenishment of the battery cluster connected to the auxiliary power supply through the turned-on power supply control circuit 320. It is worth noting that before replenishment, it is necessary to confirm that the switches of the main battery management system and each slave battery management system in the energy storage system are in the on state. This is generally confirmed manually, such as ensuring that the power button is pressed.

[0067] Advantageously, during power replenishment, when the main processor 1211 is connected to an auxiliary power source or the slave processor 1311 is connected to an auxiliary power source via the power supply control circuit 320, the main battery management system or the slave battery management system monitors the first information and sends it to the main processor 1211. The main processor 1211 sends the first information to the inverter 110 and updates the first instruction according to the first information. The main battery management system or the slave battery management system currently connected to the auxiliary power source executes the first sub-instruction to turn on the power replenishment control circuit 310 of the battery cluster. The inverter 110, based on the first information, provides power to the battery cluster through the main battery management system or the slave battery management system. At least one battery pack 140 in the battery cluster is recharged. After recharging, the main battery management system or the slave battery management system executes a second sub-instruction to disconnect the recharging control circuit 310 of the battery cluster and connect the power supply control circuit 320. This enables the battery cluster connected to the auxiliary power supply through the connected power supply control circuit 320 to recharge, avoiding the phenomenon of recharging termination due to the inability of the main battery management system or the slave battery management system to start. Furthermore, the first information can be used to accurately recharge at least one battery pack 140 in each battery cluster, while completely avoiding the operational risks and voltage imbalance problems caused by manual intervention.

[0068] The battery pack 140 of the main battery cluster 120 and each battery pack 140 in the slave battery cluster 130 are respectively connected to the inverter 110 through a power supply control circuit 310, including:

[0069] The battery pack 140 of the main battery cluster 120 and each battery pack 140 in the secondary battery cluster 130 are connected in parallel to the inverter 110 through the power supply control circuit 310.

[0070] The auxiliary power supply provides power to the slave processor 1311 through the power supply control circuit 320, including:

[0071] Each slave processor 1311 is connected in series to the auxiliary power supply via a power supply control circuit 320.

[0072] See Figure 1-2 The main battery management system or the slave battery management system also includes a first interface 150. Within the same battery cluster, the first interface 150 is connected to the main processor or the slave processor. When each slave processor 1311 is connected in series to the auxiliary power supply via a power supply control circuit 320, the power supply control circuit 320 connects the first interface 150 of its current battery cluster to the first interface 150 of an adjacent battery cluster. The adjacent battery cluster is the battery cluster adjacent to the current battery cluster along the series connection direction. During recharging, only the auxiliary power supply needs to be connected to the first interface 150 of the main battery management system 121, which is convenient for operation and facilitates modular management.

[0073] See Figure 2The main battery management system or the slave battery management system also includes a second interface 160. In the same battery cluster, the first interface 150 and the second interface 160 are connected through a power supply control circuit 320. The second interface 160 is connected to the first interface 150 of the adjacent battery cluster, which further facilitates modular management.

[0074] In some embodiments, the power replenishment control circuit 310 includes: a power replenishment control switch, wherein the battery pack 140 of the main battery cluster 120 and the battery pack 140 of the slave battery cluster 130 are connected in parallel to the inverter 110 via the power replenishment control switch; the power replenishment control switch is also connected to the main processor 1211 or the slave processor 1311, which is also used to control the closing and opening of the corresponding power replenishment control switch respectively. When the power replenishment control switch is closed, the inverter 110 is used to replenish power to the battery pack 140 of the corresponding battery cluster through the closed power replenishment control switch. The main processor 1211 or the slave processor 1311 controls the power replenishment control circuit 310 of the battery cluster by controlling the power replenishment control switch. When the power replenishment control switch is open, the power replenishment control circuit 310 of the battery cluster is disconnected; when the power replenishment control switch is closed, the power replenishment control circuit 310 of the battery cluster is connected. See also Figure 1 X1, X2...X n These are the power supply control switches, Figure 1 Each slave processor 1311 is connected in series with the auxiliary power supply via a power supply control circuit 320, 1~ n X1 represents the serial number of the battery cluster in which the power supply control switch is located, i.e., X1 is the power supply control switch in the first battery cluster (main battery cluster 120) in the sequential series direction, X2 is the power supply control switch in the second battery cluster in the sequential series direction, and X... n For the first in sequential series direction n The power supply control switch in the battery cluster; when X1 is closed, the power supply control circuit 310 in the first battery cluster in the sequential series direction is turned on. At this time, when the main processor 1211 is in the powered state, the inverter 110 provides power to at least one battery pack 140 of the main battery cluster 120 through the power supply control circuit 310 based on the first sub-information.

[0075] In some embodiments, the power supply control circuit 320 includes: a power supply control switch, with each slave processor 1311 connected in series with an auxiliary power supply via the power supply control switch; the power supply control switch is also connected to the master processor 1211 or the slave processor 1311, and the master processor 1211 or the slave processor 1311 is also used to control the closing and opening of the corresponding power supply control switch; the master processor 1211 or the slave processor 1311 controls the power supply control circuit 320 by controlling the power supply control switch; when the power supply control switch is open, the power supply control circuit 320 is disconnected; when the power supply control switch is closed, the power supply control circuit 320 is connected; when the power supply control switch is closed, the auxiliary power supply is used to supply power to the slave processor 1311 through the closed power supply control circuit 320. See also Figure 1 Y1, Y2...Y n These are the power supply control switches: Y1 is the power supply control switch for the first battery cluster (main battery cluster 120) in the sequential series direction, and Y2 is the power supply control switch for the second battery cluster in the sequential series direction. n For the first in sequential series direction n The power supply control switch in the battery cluster; when Y1 is closed, the power supply control circuit 320 in the main battery cluster 120 is turned on. The power supply control circuit 320 connects the auxiliary power supply to the slave processor 1311 of the second battery cluster in the sequential series direction. That is, the auxiliary power supply supplies power to the slave processor 1311 of the second battery cluster in the sequential series direction through the turned-on power supply control circuit 320.

[0076] In some embodiments, an instruction input device is also included, which is connected to the main processor 1211. The instruction input device is used to send a second instruction to the main processor 1211, the second instruction representing a power-on instruction. The main processor 1211 is also used to control the main battery management system of each battery cluster according to the second instruction, or to obtain the first information of the battery cluster from the battery management system and send it to the main processor 1211 respectively. The command input device is implemented in, but is not limited to, the following ways: The command input device is a human-machine interface device located on the main battery management system or the slave battery management system, preferably located on the main battery cluster 120. The human-machine interface device is a touch screen or buttons, through which a second command is input to the main battery management system or the slave battery management system; or the command input device is located on the inverter 110, and communication is established with the main battery management system or the slave battery management system via a CAN bus through the communication interface located on the inverter 110, and the second command is sent to the main battery management system or the slave battery management system through the inverter 110; or the charging command input device is located on a remote control terminal, which is a mobile device or a cloud platform, and communication is established between the remote control terminal and the main battery management system or the slave battery management system, and the second command is sent to the main battery management system or the slave battery management system through the remote control terminal. After receiving the second command, the main battery management system or any slave battery management system can send the second command to the main processor 1211 via the CAN bus. The charging command input device clarifies the charging procedure of the energy storage system, facilitating management.

[0077] The first information includes a first sub-information and a second sub-information. The first sub-information includes at least the maximum limited charging current information for the battery cluster that currently needs charging. The maximum limited charging current information is obtained by collecting the current state parameters of the battery cluster, including the current state of charge, total battery voltage, and current temperature. The main battery management system or the slave battery management system obtains the maximum limited charging current for the battery cluster based on the current state of charge and current temperature of the battery cluster, and through the recommended charging information provided by the battery cluster or battery pack manufacturer. Each battery cluster corresponds to one maximum limited charging current. The second sub-information is provided by the main processor 1211 or the slave processor 1211. The second sub-information includes at least a first state (battery cluster not yet started charging), a second state (battery cluster in charging), and a third state (battery cluster fully charged). Specifically, the main processor 1211 sends the first sub-information of each battery cluster to the inverter 110. The main processor 1211 obtains a first instruction for each battery cluster based on the second sub-information of each battery cluster. The inverter 110 charges at least one battery pack 140 of the battery cluster based on the first sub-information via the main battery management system or the slave battery management system.

[0078] See Figure 3 Secondly, embodiments of this application propose a method for replenishing power to an energy storage system, implemented using a power replenishment device for the energy storage system. The method includes:

[0079] Connect the auxiliary power supply to the main processor 1211;

[0080] The main battery management system or the battery management system obtains the first information of the battery cluster and sends it to the main processor 1211;

[0081] The main processor 1211 obtains the first instruction of each battery cluster based on the first information of each battery cluster; the main processor 1211 sends the first information of each battery cluster to the inverter 110;

[0082] The main battery management system or the slave battery management system executes the corresponding first sub-instruction based on the first information, and the inverter 110 replenishes the power of at least one battery pack 140 of the battery cluster based on the first information through the main battery management system or the slave battery management system; or the battery management system executes the corresponding second sub-instruction based on the first information.

[0083] See Figure 4 In some embodiments, the main battery management system or obtains first information about the battery cluster from the battery management system, including:

[0084] A second instruction is sent to the main processor 1211. Before sending the second instruction to the main processor 1211, the switch of the main battery management system or slave battery management system of each battery cluster needs to be operated to turn the switch on. It is worth noting that the main battery management system or slave battery management system is not necessarily in the started state when the switch is in the started state: usually, when the main battery management system or slave battery management system of at least one battery cluster in the energy storage system cannot start, the power replenishment method provided in this application needs to be used for power replenishment. At this time, even if the switch is in the started state, the main battery management system or slave battery management system of the at least one battery cluster is still in the unstarted state. After determining that the switch of the main battery management system or slave battery management system of each battery cluster is in the started state, the second instruction is sent to the main processor 1211 through the instruction input device.

[0085] The main processor 1211 recognizes the second instruction; the main processor 1211 sends a third instruction to the main battery management system or each slave battery management system according to the second instruction. The third instruction represents the instruction of the main battery management system and / or the slave battery management system to prepare for charging before charging. Specifically, the third instruction is to disconnect the charging control circuit 310 of the battery cluster to ensure that only one battery cluster receives charging from the inverter 110 during the charging process, so as to achieve accurate and efficient charging.

[0086] The main battery management system or the slave battery management system executes a third instruction. When the main battery management system or the slave battery management system is in the start state, it executes a third instruction to disconnect itself from the inverter 110. When the main battery management system or the slave battery management system is in the non-start state, it is always disconnected from the inverter 110.

[0087] Along the sequential connection direction, when the main battery management system or the slave battery management system is powered by the auxiliary power supply, the main battery management system or the slave battery management system obtains first information based on the battery cluster it belongs to. When the main processor 1211 detects that the main battery management system and each slave battery management system are disconnected from the inverter 110, that is, the charging control circuit 310 is disconnected, the main battery management system or the slave battery management system cannot be used to perform the charging and discharging function of the energy storage system. Since only the main battery management system 121 is powered by the auxiliary power supply at this time, the main battery management system 121 collects the current state parameters of the main battery cluster it belongs to obtain the first information. As the charging procedure continues, along the sequential connection direction, when the slave battery management system is powered by the auxiliary power supply, the slave battery management system collects the current state parameters of the slave battery cluster it belongs to obtain the first information. The first information includes at least first sub-information related to the maximum limited charging current, and second sub-information that clarifies the current charging state of the battery cluster it belongs to.

[0088] When the main battery management system or the slave battery management system executes a third instruction and the inverter 110 has not yet started to recharge at least one battery pack 140 in the battery cluster, the current recharging state of the battery cluster is not started, that is, the second sub-information of the battery cluster is in the first state.

[0089] When the main battery management system or the slave battery management system executes the third instruction, and the inverter 110 replenishes at least one battery pack 140 in the battery cluster based on the first sub-information and the connected replenishment control circuit 310, and the total battery voltage of the battery cluster is lower than the replenishment voltage threshold, the current replenishment state of the battery cluster is replenishment in progress, that is, the second sub-information of the battery cluster is in the second state; the replenishment voltage threshold is the sum of the start-up voltage threshold and the preset voltage. The replenishment voltage threshold can ensure that the voltage of the battery cluster can compete with the auxiliary power supply for power supply, so as not to affect the auxiliary power supply to the adjacent battery cluster.

[0090] When the main battery management system or the slave battery management system executes the third instruction, and the inverter 110 replenishes at least one battery pack 140 in the battery cluster based on the first sub-information and the connected replenishment control circuit 310, and the total battery voltage of the battery cluster is not lower than the replenishment voltage threshold, the current replenishment state of the battery cluster is replenishment completed, that is, the second sub-information of the battery cluster is in the third state.

[0091] The main processor 1211 sends the first sub-information of each battery cluster to the inverter 110; the main processor 1211 obtains the first instruction of each battery cluster according to the second sub-information of each battery cluster; the inverter 110 replenishes power to at least one battery pack 140 of the battery cluster based on the first sub-information through the main battery management system or the slave battery management system, that is, based on the execution of the first instruction by the main battery management system or the slave battery management system, the inverter 110 replenishes power to at least one battery pack 140 of the battery cluster based on the first sub-information through the main battery management system or the slave battery management system.

[0092] In some of these embodiments, see Figure 5 The main battery management system or the slave battery management system executes a corresponding first sub-instruction based on the first information, and the inverter 110 replenishes at least one battery pack 140 of the battery cluster based on the first information through the main battery management system or the slave battery management system; or the main battery management system or the slave battery management system executes a corresponding second sub-instruction based on the first information, including:

[0093] Initialize the current charging sequence number, which is the sequence number of the battery cluster along the sequential connection direction, and let... , This is the current power replenishment sequence number;

[0094] When the second sub-information of the battery cluster corresponding to the current power replenishment sequence number is in the first state, the main processor 1211 sends the first sub-instruction to the main processor or slave processor corresponding to the current power replenishment sequence number.

[0095] The master or slave processor corresponding to the current power-up sequence number executes the first sub-instruction;

[0096] The inverter 110 replenishes power to at least one battery pack 140 of the battery cluster based on the first sub-information through the main processor or slave processor corresponding to the current replenishment sequence number;

[0097] When the second sub-information of the battery cluster corresponding to the current power replenishment sequence number is in the second state, the inverter 110 replenishes at least one battery pack 140 of the battery cluster based on the first sub-information through the main processor or slave processor corresponding to the current power replenishment sequence number.

[0098] When the second sub-information of the battery cluster corresponding to the current power replenishment sequence number is in the third state, the main processor 1211 sends the second sub-instruction to the main processor or slave processor corresponding to the current power replenishment sequence number; as explained above, when the total battery voltage of the battery cluster corresponding to the current power replenishment sequence number is not lower than the power replenishment voltage threshold, the second sub-information of the battery cluster corresponding to the current power replenishment sequence number is in the third state.

[0099] The master or slave processor corresponding to the current power-up sequence number executes the second sub-instruction and instructs... ;

[0100] when hour, Given the total number of battery clusters, when the second sub-information of the battery cluster corresponding to the current power replenishment sequence number is in the first state, the main processor 1211 sends the first sub-instruction to the main processor or slave processor corresponding to the current power replenishment sequence number.

[0101] when At that time, the power replenishment will end.

[0102] When the charging process ends, the main processor 1211 sends a fourth instruction to the main battery management system and each of the slave battery management systems. The main battery management system and each of the slave battery management systems execute the fourth instruction, and all battery clusters return to normal operation. The fourth instruction is to connect the charging control circuit 310 of the battery cluster and disconnect the power supply control circuit 320 of the battery cluster. In normal operation, each battery cluster charges and discharges between the inverter 110 and at least one battery pack 140 through the corresponding main battery management system or slave battery management system.

[0103] In some embodiments, the second sub-information also includes a fourth state, i.e., the battery cluster is in a faulty state. When the second sub-information is in the fourth state, the energy storage system jumps to the fifth state, which represents the state when the main processor 1211 recognizes the second instruction.

[0104] In some embodiments, the faults include a first fault and a second fault. The first fault is a fault in which the main battery management system or the slave battery management system cannot be turned on, that is, the main battery management system or the slave battery management system that has the first fault cannot enter the fully automatic charging process. When the main battery management system or the slave battery management system of the adjacent battery cluster is not detected to be online within a preset time, the battery management system of the adjacent battery cluster experiences the first fault. The second fault is a fault that occurs when the main battery management system or the slave battery management system is turned on and during the charging process, that is, the charging process is interrupted when the second fault occurs. The second fault includes single cell overvoltage, battery overtemperature, charging overcurrent, etc. The definition of the second fault depends on the system definition. In addition, when the second sub-information is in the fourth state, the main processor 1211 reports the fault and waits for after-sales troubleshooting or the fault disappears. The host sends a third instruction to the main battery management system and the slave battery management system and executes the above initialization of the current charging sequence number again and performs charging.

[0105] Example 2

[0106] The difference between Example 1 and Example 2 is that:

[0107] The battery pack 140 of the main battery cluster 120 and the battery pack 140 in each of the slave battery clusters 130 are respectively connected to the inverter 110 through the power supply control circuit 310, including: the battery pack 140 of the main battery cluster 120 and the battery pack 140 in each of the slave battery clusters 130 are respectively connected in series to the inverter 110 through the power supply control circuit 310.

[0108] The auxiliary power supply supplies power to the main processor 1211 and / or supplies power to the slave processor 1311 through the power supply control circuit 320, including: the main processor 1211 and each slave processor 1311 are respectively connected to the auxiliary power supply through the power supply control circuit 320.

[0109] When the main processor 1211 and each slave processor 1311 are connected to the inverter 110 respectively, the working principle during power replenishment is as follows: the power supply control circuit 320 corresponding to the battery cluster located at the first position along the first series direction is turned on. The first series direction represents the direction from near the inverter 110 to away from the inverter 110 along the series connection direction of the power replenishment control circuit 310. The auxiliary power supply supplies power to the main processor 1211 or the slave processor 1311 through the turned-on power supply control circuit 320. When the main processor 1211 or the slave processor 1311 detects the auxiliary power supply access, it begins to collect the first information of the battery cluster and send it to the inverter 110 and the power supply control circuit 310 of the battery cluster. Based on the first information, the inverter 110 connects the power supply control circuit 310 to supply power to at least one battery pack 140 of the battery cluster through the corresponding main battery management system or slave battery management system. After the battery cluster is fully supplied with power, the inverter disconnects the corresponding power supply control circuit 320 and connects the power supply control circuit 320 of the next battery cluster connected sequentially along the first series direction, and supplies power to the next battery cluster connected sequentially.

[0110] When only the main processor 1211 is connected to the inverter 110, the main battery cluster 120 is the battery cluster located at the first position along the first series direction. The working principle during power replenishment is as follows: the power supply control circuit 320 corresponding to the main battery cluster 120 is controlled to be turned on, and the auxiliary power supply supplies power to the main processor 1211 through the turned-on power supply control circuit 320. When the main processor 1211 detects the auxiliary power supply connection, it begins to collect the first information of the main battery cluster 120 and sends it to the inverter 110 and the power supply control circuit 310 that connects the main battery cluster 120. Based on the first information, the inverter 110, through the power supply control circuit 310, supplies power to at least one battery pack 140 of the main battery cluster 120 via the main battery management system. After the main battery cluster 120 is fully powered, it controls the power supply control circuit 320 corresponding to the next slave battery cluster 130 connected sequentially along the first series direction. The auxiliary power supply simultaneously supplies power to the main battery cluster 120 and the connected slave battery cluster 130. When the slave processor 1311 detects the auxiliary power supply connection, it begins to collect the first information of the slave battery cluster 130. The first information is sent to the main processor 1211. The main processor 1211 sends the first information to the inverter 110. According to the first information, the slave processor 1311 corresponding to the connected slave battery cluster 130 connects the power supply control circuit 310 of the slave battery cluster 130. Based on the first information, the inverter 110 connects the power supply control circuit 310 to power at least one battery pack 140 of the slave battery cluster through the slave battery management system. After the slave battery cluster 130 is powered, the power supply control circuit corresponding to the slave battery cluster 130 is disconnected and connected to the power supply control circuit 320 corresponding to the next slave battery cluster 130 connected sequentially along the first series direction, and the next connected slave battery cluster 130 is powered.

[0111] Example 3

[0112] The difference between Example 1 and Example 2 is that:

[0113] The battery pack 140 of the main battery cluster 120 and the battery pack 140 in each of the slave battery clusters 130 are respectively connected to the inverter 110 through the power supply control circuit 310, including: the battery pack 140 of the main battery cluster 120 and the battery pack 140 in each of the slave battery clusters 130 are respectively connected in series to the inverter 110 through the power supply control circuit 310.

[0114] The auxiliary power supply supplies power to the main processor 1211 and / or supplies power to the slave processor 1311 through the power supply control circuit 320, including: the main processor 1211 and each slave processor 1311 are respectively connected in series to the auxiliary power supply through the power supply control circuit 320.

[0115] The main battery cluster 120 is the battery cluster located at the first position along the first series connection direction. The first series connection direction represents the direction from near the inverter 110 to away from the inverter 110 along the series connection direction of the power supply control circuit 310, and the first series connection direction represents the direction from near the auxiliary power supply to away from the auxiliary power supply along the series connection direction of the power supply control circuit 320. The working principle during power supply is as follows: the power supply control circuit 320 corresponding to the main battery cluster 120 is turned on, and the auxiliary power supply supplies power to the main processor 1211 through the turned-on power supply control circuit 320. When the main processor 1211 detects the auxiliary power supply connection, it begins to collect the first information of the main battery cluster 120 and sends it to the inverter 110 and the power supply control circuit 310 that connects the main battery cluster 120. Based on the first information, the inverter 110, through the power supply control circuit 310, supplies power to at least one battery pack 140 of the main battery cluster 120 via the main battery management system. After the main battery cluster 120 is fully powered, it controls the power supply control circuit 320 corresponding to the next slave battery cluster 130 connected sequentially along the first series direction. The auxiliary power supply simultaneously supplies power to the main battery cluster 120 and the connected slave battery cluster 130. When the slave processor 1311 detects the auxiliary power supply connection, it begins to collect... The first information of the battery cluster is sent to the main processor 1211. The main processor 1211 sends the first information to the inverter 110. According to the first information, the slave processor 1311 corresponding to the connected slave battery cluster 130 connects the power supply control circuit 310 of the slave battery cluster 130. Based on the first information, the inverter 110 connects the power supply control circuit 310 to supply power to at least one battery pack 140 of the slave battery cluster through the slave battery management system. After the slave battery cluster 130 is fully supplied with power, the control circuit 320 corresponding to the next slave battery cluster 130 connected sequentially along the first series direction is connected to supply power to the next slave battery cluster 130 connected sequentially.

[0116] Example 4

[0117] The difference between Example 1 and Example 2 is that:

[0118] The battery pack 140 of the main battery cluster 120 and the battery pack 140 of each slave battery cluster 130 are respectively connected to the inverter 110 through the power supply control circuit 310, including: the battery pack 140 of the main battery cluster 120 and the battery pack 140 of each slave battery cluster 130 are respectively connected to the inverter 110 through the power supply control circuit 310.

[0119] The auxiliary power supply supplies power to the main processor 1211 and / or supplies power to the slave processor 1311 through the power supply control circuit 320, including: the main processor 1211 and each slave processor 1311 are respectively connected to the auxiliary power supply through the power supply control circuit 320.

[0120] When only the main processor 1211 is connected to the inverter 110, the working principle during power replenishment is as follows: the power supply control circuit 320 corresponding to the main battery cluster 120 is activated, and the auxiliary power supply supplies power to the main processor 1211 through the activated power supply control circuit 320. When the main processor 1211 detects the auxiliary power supply connection, it begins to collect the first information of the main battery cluster 120 and sends it to the inverter 110 and the power replenishment control circuit 310 that activates the main battery cluster 120. Based on the first information, the inverter 110 replenishes power to at least one battery pack 140 of the main battery cluster 120 through the main battery management system via the activation of the power replenishment control circuit 310. After the main battery cluster 120 is fully replenished, the power supply control circuit 320 corresponding to any slave battery cluster 130 that has not yet completed replenishment is activated. The auxiliary power supply simultaneously supplies power to the main battery cluster 120 and the activated slave battery cluster 130. When the slave processor 1311 detects the auxiliary power supply connection, it begins to collect the first information of its slave battery cluster. The information is sent to the main processor 1211, which then sends the first information to the inverter 110. Based on the first information, the slave processor 1311 corresponding to the connected slave battery cluster 130 connects the power supply control circuit 310 of the slave battery cluster 130. The inverter 110, based on the first information, connects the power supply control circuit 310 to power at least one battery pack 140 of the slave battery cluster through the slave battery management system. After the slave battery cluster 130 is fully powered, the power supply control circuit 320 corresponding to the slave battery cluster 130 is disconnected, and the power supply control circuit 320 corresponding to any slave battery cluster 130 that has not been fully powered is connected to power the connected slave battery cluster 130.

[0121] When the main processor 1211 and each slave processor 1311 are connected to the inverter 110, the working principle during power replenishment is as follows: the power supply control circuit 320 corresponding to any battery cluster that has not yet completed power replenishment is activated, and the auxiliary power supply supplies power to the main processor 1211 or slave processor 1311 through the activated power supply control circuit 320. When the main processor 1211 or slave processor 1311 detects the auxiliary power supply connection, it starts to collect the first information of the battery cluster and sends it to the inverter 110, and activates the power replenishment control circuit 310 of the battery cluster. Based on the first information, the inverter 110 activates the power replenishment control circuit 310 to replenish at least one battery pack 140 of the battery cluster through the corresponding main battery management system or slave battery management system. After the battery cluster is replenished, the corresponding power supply control circuit 320 is disconnected, and the power supply control circuit 320 corresponding to any battery cluster that has not yet completed power replenishment is activated, and the activated battery cluster is replenished.

[0122] Thirdly, embodiments of this application propose a battery management system, which includes a power replenishment device for the energy storage system in any of the foregoing embodiments.

[0123] Fourthly, this application provides an energy storage system including a converter, a main battery cluster, and at least one slave battery cluster, wherein the main battery cluster and the slave battery cluster respectively include the battery management system described in the foregoing embodiments.

[0124] It should be understood that the phrases "one embodiment" or "some embodiments" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in one embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0125] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0126] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components may be combined, or integrated into another device, or some features may be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0127] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units. They may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0128] In addition, each functional unit in the various embodiments of this application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0129] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media that can store program code, such as mobile storage devices, read-only memory (ROM), magnetic disks, or optical disks.

[0130] Alternatively, if the integrated units described above are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a device (which may be a terminal or platform, etc.) to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROMs, magnetic disks, or optical disks.

[0131] Finally, it should be noted that the above content is only used to illustrate the technical solution of this application, and is not intended to limit the scope of protection of this application. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this application shall not depart from the substance and scope of the technical solution of this application.

Claims

1. A power replenishment device for an energy storage system, characterized in that, The energy storage system includes a converter, a main battery cluster comprising a main battery management system and a battery pack, and a slave battery cluster comprising a slave battery management system and a battery pack. The main battery management system includes a main processor, and the slave battery management system includes a slave processor connected in parallel with the main processor and connected to the converter. The main processor is communicatively connected to both the converter and the slave processor. The power replenishment device includes: A power supply control circuit and a power supply control circuit are provided; the battery packs of the main battery cluster and the battery packs of the slave battery cluster are respectively connected to the inverter through the power supply control circuit; the auxiliary power supply is used to supply power to the main processor and / or to the slave processor through the power supply control circuit. The main processor is configured to obtain a first instruction based on first information; the first information includes first sub-information representing the maximum limit of the charging current of the main battery cluster or slave battery cluster that currently needs charging; the first instruction includes a first sub-instruction representing the activation of the charging control circuit of the main battery cluster or slave battery cluster, and a second sub-instruction representing the deactivation of the charging control circuit of the main battery cluster or slave battery cluster and the activation of the power supply control circuit of the main battery cluster or slave battery cluster; the slave processor is configured to control the charging control circuit and the power supply control circuit of the slave battery cluster respectively based on the first instruction; the inverter is configured to charge the battery pack of the main battery cluster or slave battery cluster respectively through the main battery management system or the slave battery management system based on the first information.

2. The power replenishment device for the energy storage system according to claim 1, characterized in that, The main battery pack and the slave battery pack are respectively connected to the inverter through the power supply control circuit, including: The battery pack of the main battery cluster and the battery pack of the slave battery cluster are respectively connected to the inverter through the power supply control circuit; The auxiliary power supply supplies power to the slave processor through the power supply control circuit, including: When the number of slave processors is at least two, each slave processor is connected in series with the auxiliary power supply through the power supply control circuit.

3. The power replenishment device for the energy storage system according to claim 2, characterized in that, The power supply control circuit includes: A power supply control switch; the battery pack of the main battery cluster and the battery pack of the slave battery cluster are connected in parallel to the inverter via the power supply control switch; the power supply control switch is also connected to the main processor or the slave processor; The main processor or the slave processor is also used to control the closing and opening of the corresponding power supply control switch, respectively; When the power replenishment control switch is closed, the converter is used to replenish the battery pack corresponding to the main battery cluster or the slave battery cluster through the closed power replenishment control switch.

4. The power replenishment device for the energy storage system according to claim 3, characterized in that, The power supply control circuit includes: Power supply control switch; each of the slave processors is connected in series with the auxiliary power supply through the power supply control switch, and the power supply control switch is also connected to the main processor or the slave processor; The main processor or the slave processor is also used to control the closing and opening of the corresponding power supply control switch, respectively; When the power supply control switch is closed, the auxiliary power supply is used to supply power to the slave processor through the closed power supply control circuit.

5. The power replenishment device for the energy storage system according to claim 1, characterized in that, The first information also includes second sub-information, which includes being in a first state, being in a second state, and being in a third state. The first state indicates that the battery cluster is in a state where charging has not started, the second state indicates that the battery cluster is in a state where charging is in progress, and the third state indicates that the battery cluster is in a state where charging is complete. The battery cluster indicates the main battery cluster or the slave battery cluster. The main processor is used to send the first sub-information of each of the battery clusters to the inverter; The main processor is used to obtain the first instruction of the battery cluster according to the second sub-information of each battery cluster; The converter is used to replenish the battery pack of the battery cluster based on the first sub-information via the main battery management system or the slave battery management system.

6. The power replenishment device for the energy storage system according to claim 5, characterized in that, The second sub-information also includes being in a fourth state, which indicates that the battery cluster is in a faulty state; When the second sub-information indicates that the system is in the fourth state, the energy storage system jumps to the fifth state. The fifth state represents the state when the main processor recognizes the second instruction, and the second instruction represents the power replenishment start instruction.

7. The power replenishment device for the energy storage system according to claim 1, characterized in that, The battery pack of the main battery cluster and the battery pack of the slave battery cluster are respectively connected to the inverter through the power supply control circuit, including: the battery pack of the main battery cluster and the battery pack of the slave battery cluster are respectively connected in series to the inverter through the power supply control circuit; The auxiliary power supply supplies power to the main processor and / or supplies power to the slave processor through the power supply control circuit, including: the main processor and the slave processor are respectively connected in parallel or in series to the auxiliary power supply through the power supply control circuit; or: The battery pack of the main battery cluster and the battery pack of the slave battery cluster are respectively connected to the inverter through the power supply control circuit, including: the battery pack of the main battery cluster and the battery pack of the slave battery cluster are respectively connected in parallel to the inverter through the power supply control circuit; The auxiliary power supply supplies power to the main processor and / or supplies power to the slave processor through the power supply control circuit, including: the main processor and the slave processor are respectively connected in parallel to the auxiliary power supply through the power supply control circuit.

8. A method for replenishing power to an energy storage system, implemented using the power replenishment device for the energy storage system according to any one of claims 1-7, characterized in that, The power replenishment method includes: The main battery management system or the slave battery management system obtains the first information of the battery cluster and sends it to the main processor, wherein the battery cluster represents the main battery cluster or the slave battery cluster; The main processor obtains the first instruction for each battery cluster based on the first information of each battery cluster; the main processor sends the first information of each battery cluster to the inverter; The main battery management system or the slave battery management system executes the corresponding first sub-instruction based on the first information, and the inverter replenishes the battery pack of the battery cluster based on the first information through the main battery management system or the slave battery management system; or The main battery management system or the slave battery management system executes the corresponding second sub-instruction based on the first information.

9. The method for replenishing power to an energy storage system according to claim 8, characterized in that, The main battery management system or the slave battery management system executes the corresponding first sub-instruction based on the first information, and the inverter replenishes the battery pack of the battery cluster based on the first information through the main battery management system or the slave battery management system; The main battery management system or the slave battery management system executes the corresponding second sub-instruction based on the first information, including: Initialize the current charging sequence number, which is the sequence number of the battery clusters along the sequential connection direction, and let... , This is the current power replenishment sequence number; When the second sub-information of the battery cluster corresponding to the current power replenishment sequence number is in the first state, the main processor sends the first sub-instruction to the main processor or the slave processor corresponding to the current power replenishment sequence number; The main processor or the slave processor corresponding to the current power-up sequence number executes the first sub-instruction; The converter replenishes the battery pack of the battery cluster based on the first sub-information through the main processor or the slave processor corresponding to the current replenishment sequence number; When the second sub-information of the battery cluster corresponding to the current power replenishment sequence number is in the third state, the main processor sends the second sub-instruction to the main processor or the slave processor corresponding to the current power replenishment sequence number; The master processor or slave processor corresponding to the current power-up sequence number executes the second sub-instruction and instructs... ; when hour, For the total number of battery clusters, when the second sub-information of the battery cluster corresponding to the current charging sequence number is in the first state, the main processor sends the first sub-instruction to the main processor or the slave processor corresponding to the current charging sequence number; when At that time, the power replenishment will end.

10. The method for replenishing power to an energy storage system according to claim 9, characterized in that, When the total battery voltage of the battery cluster corresponding to the current charging sequence number is not lower than the charging voltage threshold, the second sub-information indicates that it is in the third state.

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