Energy storage communication system and energy storage system

Abstract

The embodiment of the application provides a kind of energy storage communication system and energy storage system, belong to power electronics technical field.Energy storage communication system, comprising: at least one battery cluster level management unit group and at least one first management unit, wherein, one battery cluster level management unit group includes N battery cluster level management units, N is greater than or equal to 2 positive integer, adjacent battery cluster level management unit of N battery cluster level management unit is communicatively connected, forms first communication link, the battery cluster level management unit of the first communication link in the first and last two ends is all with one first management unit communicatively connected, forms first ring network communication channel;Battery cluster level management unit is used to realize the monitoring, control and / or protection of battery cluster, and the first management unit is the upper level management unit of battery cluster level management unit.The application can reduce the setting of communication cable by adopting ring redundancy communication, and improve the reliability of energy storage communication system.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and more specifically, to an energy storage communication system and an energy storage system. Background Technology

[0002] In related technologies, the secondary communication architecture of energy storage systems usually adopts a star topology. Especially for large-capacity energy storage, there are many batteries, resulting in a large number of optical fibers and complex wiring. Furthermore, if a single communication node fails, it will be impossible to determine the network status and it does not support changes in the broadcast communication topology, leading to low communication reliability. Summary of the Invention

[0003] This application provides an energy storage communication system and an energy storage system to solve the problems of large number of optical fibers, complex wiring, and low communication reliability in energy storage systems using a star topology in related technologies.

[0004] In a first aspect, embodiments of this application provide an energy storage communication system, comprising: at least one battery cluster-level management unit group and at least one first management unit, wherein a battery cluster-level management unit group comprises N battery cluster-level management units, where N is a positive integer greater than or equal to 2.

[0005] The adjacent battery cluster-level management units of the N battery cluster-level management units are connected to each other to form a first communication link. The battery cluster-level management units at both ends of the first communication link are connected to one of the first management units to form a first ring network communication channel.

[0006] The battery cluster-level management unit is used to monitor, control, and / or protect the battery clusters, and the first management unit is the next higher-level management unit of the battery cluster-level management unit.

[0007] In the above technical solution, adjacent battery cluster-level management units of multiple battery cluster-level management units are connected to form a first communication link. The battery cluster-level management units at both ends of the first communication link are connected to a first management unit, forming a first ring network communication channel. By adopting ring redundant communication, the setting of communication cables can be reduced and the wiring can be simplified when increasing energy storage capacity with multiple clusters. Furthermore, since a ring network is formed, each battery cluster-level management unit in the ring network can determine the network status and broadcast changes in the communication topology to send cluster-level information. The amount of data sent at the cluster level is appropriate, and the link delay for fault reporting can be shortened, thereby improving the reliability of the energy storage communication system.

[0008] In some embodiments, the first management unit is a battery system management unit, and the battery cluster-level management units at both ends of the first communication link are communicatively connected to the battery system management unit. The battery system management unit is used to monitor, control, and / or protect the batteries in the sub-module to which the battery cluster belongs. The battery system management unit is also connected to a sub-module controller, which is connected to the power module in the sub-module to which the battery cluster belongs, and is used to monitor, control, and / or protect the power module.

[0009] In the above technical solution, adjacent battery cluster-level management units of multiple battery cluster-level management units are connected to form a first communication link. The battery cluster-level management units at both ends of the first communication link are connected to a battery system management unit, forming a communication ring network of a single submodule battery system. This can reduce the setting of communication cables and simplify wiring when increasing energy storage capacity with multiple clusters. Furthermore, since a ring network is formed, each battery cluster-level management unit in the ring network can report cluster-level information, determine network status, and broadcast changes in communication topology, thereby improving the reliability of the energy storage communication system.

[0010] In some embodiments, the battery cluster-level management unit at one end of the first communication link is also communicatively connected to the submodule controller or the battery background monitoring system for transmitting brief information related to battery cluster safety.

[0011] In the above technical solution, a single-party transmission network is added after the battery cluster-level management unit is connected in series. This network is used to transmit brief information related to battery cluster safety, thereby ensuring that even if the battery system management unit fails, the energy storage valve control device or the battery background monitoring system can still read the safety information of the battery cluster, ensuring the uninterrupted operation of the energy storage system and improving the availability and reliability of the energy storage system.

[0012] In some embodiments, the first management unit is a battery system management unit and a submodule controller, which are communicatively connected. The battery system management unit is used to monitor, control, and / or protect the batteries in the submodule to which the battery cluster belongs. The submodule controller is connected to the power module in the submodule to which the battery cluster belongs and is used to monitor, control, and / or protect the power module. The first and last ends include a first end and a second end. The battery cluster-level management unit at the first end is communicatively connected to the battery system management unit, and the battery cluster-level management unit at the second end is communicatively connected to the submodule controller.

[0013] In the above technical solution, adjacent battery cluster-level management units of N battery cluster-level management units are connected to form a first communication link. The battery cluster-level management units at both ends of the first communication link are connected to the battery system management unit and the submodule controller, respectively, forming a communication ring network between the SBMU and the BMC and SMC. Redundant backup of detailed battery cluster information is implemented on the BMC and SMC. When the BMC fails at a single point, the SMC can obtain detailed battery cluster information and continue to effectively monitor, control and / or protect the submodule batteries, so that the entire system can still operate normally. Through ring redundant communication, the transmission of battery information can be achieved while reducing the setting of communication cables, simplifying the wiring. Each battery cluster-level management unit in the ring network can determine the network status and broadcast changes in the communication topology. The amount of data transmitted at the cluster level is appropriate, and the link delay for fault reporting can be shortened, improving the reliability of the energy storage communication system.

[0014] In some embodiments, the first management unit is a submodule integrated controller, and the battery cluster-level management units at both ends of the first communication link are connected to the submodule integrated controller. The submodule integrated controller is used to monitor, control, and / or protect the batteries and power modules in the submodule to which the battery cluster belongs.

[0015] In the above technical solution, adjacent battery cluster management units of multiple battery cluster management units are connected to form a first communication link. The battery cluster management units at both ends of the first communication link are connected to a submodule integrated controller, forming a communication ring network between SBMU and SBMC. This reduces the number of communication cables and simplifies wiring. Furthermore, because a ring network is formed, each battery cluster management unit in the ring network can report cluster-level information, determine network status, and broadcast changes in communication topology. The amount of data transmitted for cluster-level information is appropriate, and the link delay for fault reporting can be shortened, thus improving the reliability of the energy storage communication system.

[0016] In some embodiments, the energy storage communication system further includes: a second management unit, wherein the second management unit is the management unit above the first management unit;

[0017] In the case of only one submodule, the submodule controller of the submodule is communicatively connected to the battery system management unit to form a second communication link. Both ends of the second communication link are communicatively connected to the second management unit to form a second ring network communication channel.

[0018] In the above technical solution, based on the first ring network communication channel formed by SBMU and BMC, a second ring network communication channel is added, which is formed by SMC, BMC and second management unit. The second management unit is a device related to the energy storage valve control device. It can still achieve communication with the energy storage valve control device when SMC or BMC fails at a single point, without interrupting the monitoring of the sub-module's battery, thus improving the reliability of the energy storage system.

[0019] In some embodiments, the energy storage communication system further includes: a second management unit, wherein the second management unit is the management unit above the first management unit;

[0020] In the case of at least two sub-modules, within a sub-module, the sub-module controller of the sub-module is communicatively connected to the battery system management unit. Between adjacent sub-modules, the battery system management unit or sub-module controller of the preceding sub-module is communicatively connected to the battery system management unit or sub-module controller of the following sub-module, forming a second communication link. Both ends of the second communication link are communicatively connected to the second management unit, forming a second ring network communication channel.

[0021] In the above technical solution, when dealing with at least two sub-modules, a second ring network communication channel is added, consisting of the SMC, BMC, and a second management unit, on the basis of the first ring network communication channel formed by the SBMU and BMC. The second management unit is a device related to the energy storage valve control device, which can still achieve communication with the energy storage valve control device when the SMC or BMC fails at a single point, without interrupting the monitoring of the sub-module's battery, thus improving the reliability of the energy storage system.

[0022] In some embodiments, the energy storage communication system further includes: a second management unit, wherein the second management unit is the management unit above the first management unit;

[0023] In the case of only one submodule, the first management unit and the second management unit are connected to form a second ring network communication channel.

[0024] In the above technical solution, based on the first ring network communication channel formed by SBMU, BMC, and SMC, a second ring network communication channel is added, consisting of BMC, SMC, and a second management unit. The second management unit is a device related to the energy storage valve control device, which can still achieve communication with the energy storage valve control device even when the SMC or BMC fails at a single point, without interrupting the monitoring of the submodule's battery. Furthermore, the second management unit can be the energy storage valve control device and the battery background monitoring system, or the main energy storage valve control device and the backup energy storage valve control device, thus realizing the backup of the battery status monitoring function and improving the reliability of the energy storage system. Based on the first ring network communication channel formed by SBMU and SBMC, a second ring network communication channel is added, formed by SBMC and the second management unit. The second management unit is a device related to the energy storage valve control device. Battery information can be sent to the energy storage valve control device, reducing the setup of communication cables and simplifying wiring. Furthermore, since a two-layer ring network is formed, each battery cluster-level management unit in the first ring network can determine the network status and broadcast changes in the communication topology. The second management unit can be the energy storage valve control device and the battery backend monitoring system, or the main energy storage valve control device and the backup energy storage valve control device, realizing backup of the battery status monitoring function and improving the reliability of the energy storage system.

[0025] In some embodiments, the energy storage communication system further includes: a second management unit, wherein the second management unit is the management unit above the first management unit;

[0026] In the case of at least two sub-modules, the first management unit of the preceding sub-module and the first management unit of the following sub-module are connected to each other to form a second communication link. Both ends of the second communication link are connected to the second management unit to form a second ring network communication channel.

[0027] In the above technical solution, when dealing with at least two sub-modules, a second ring network communication channel is added, consisting of the BMC, SMC, and a second management unit, based on the first ring network communication channel formed by the SBMU, BMC, and SMC. The second management unit is a device related to the energy storage valve control device, which can still communicate with the energy storage valve control device even when the SMC or BMC fails at a single point. This ensures that the energy storage valve control device receives battery information without interrupting the monitoring of the sub-module's battery. Furthermore, the second management unit in the second ring network can be the energy storage valve control device and the battery background monitoring system, or the main energy storage valve control device and the backup energy storage valve control device, thus achieving backup of the battery status monitoring function and improving the reliability of the energy storage system. Based on the first ring network communication channel formed by SBMU and SBMC, a second ring network communication channel is added, formed by SBMC and the second management unit. The second management unit is a device related to the energy storage valve control device, which reduces the setting of communication cables and simplifies the wiring. Since a two-layer ring network is formed, each battery cluster-level management unit in the first ring network can determine the network status and broadcast changes in the communication topology. Furthermore, the second management unit in the second ring network can be the energy storage valve control device and the battery background monitoring system, or the main energy storage valve control device and the backup energy storage valve control device, realizing backup of the battery status monitoring function and improving the reliability of the energy storage system.

[0028] In some embodiments, the second management unit includes one of the following:

[0029] Energy storage valve control device;

[0030] An energy storage valve control device and a battery background monitoring system, wherein the energy storage valve control device and the battery background monitoring system are communicatively connected;

[0031] Main energy storage valve control device and backup energy storage valve control device.

[0032] In the above technical solution, the second management unit can be an energy storage valve control device, an energy storage valve control device and a battery background monitoring system, or a main energy storage valve control device and a backup energy storage valve control device. This realizes a second ring network communication channel, which enables the energy storage valve control device to still receive battery information and not interrupt the monitoring of the submodule's battery when the SMC or BMC fails at a single point. Furthermore, the second management unit in the second ring network can be an energy storage valve control device and a battery background monitoring system, or a main energy storage valve control device and a backup energy storage valve control device, which realizes the backup of the battery status monitoring function and improves the reliability of the energy storage system.

[0033] In some embodiments, both ends of the second communication link are connected to the second management unit to form a second ring network communication channel, including one of the following:

[0034] Both the first end and the second end of the second communication link are connected to the energy storage valve control device to form a second ring network communication channel;

[0035] The first end of the second communication link is connected to the energy storage valve control device, and the second end of the second communication link is connected to the battery background monitoring system, forming a second ring network communication channel;

[0036] Both the first end and the second end of the second communication link are connected to the main energy storage valve control device, and both the first end and the second end of the second communication link are also connected to the backup energy storage valve control device.

[0037] In some embodiments, the energy storage valve control device is an energy storage valve control device that integrates the battery background monitoring system function, or an energy storage valve control device that has undergone software backup.

[0038] In some embodiments, the energy storage communication system further includes: at least one battery module management unit group, wherein a battery module management unit group includes M battery module management units, where M is a positive integer greater than or equal to 2.

[0039] The adjacent battery module management units of the M battery module management units are connected to each other to form a third communication link. The battery module management units at both ends of the third communication link are connected to a battery cluster-level management unit to form a third ring network communication channel. The battery module management unit is used to monitor, control and / or protect each battery cell in the battery module.

[0040] In the above technical solution, a third ring network communication channel can be added to the structure of the aforementioned energy storage communication system, realizing cell-level monitoring, control, and / or protection below the battery cluster-level management unit. The entire ring network redundant communication is a decentralized communication method. Through fast communication protocols and ring redundant communication logic, the problem of submodule communication failure can be solved. That is, even if a single point of failure occurs, the entire system can still operate normally and does not rely on the monitoring system or other control equipment. The monitoring system only plays a supervisory and management role for the submodules. Therefore, if the monitoring system fails, the ring network can still operate normally, and each communication node can determine the network status and broadcast changes in the communication topology, ensuring uninterrupted communication of the ring network and improving the reliability of the energy storage system.

[0041] In some embodiments, the communication connection is a bidirectional communication connection or a unidirectional communication connection.

[0042] Secondly, embodiments of this application provide an energy storage system, including the energy storage communication system described in the first aspect.

[0043] In some embodiments, the energy storage system is a DC-connected energy storage system. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the secondary communication architecture of a DC direct-connected energy storage valve in related technologies;

[0046] Figure 2 This is one of the structural schematic diagrams of an energy storage communication system provided in some embodiments of this application;

[0047] Figure 3 This is a second schematic diagram of the structure of an energy storage communication system provided in some embodiments of this application;

[0048] Figure 4 This is the third of the structural schematic diagrams of the energy storage communication system provided in some embodiments of this application;

[0049] Figure 5 This is the fourth of several schematic diagrams of the energy storage communication system provided in some embodiments of this application;

[0050] Figure 6 This is the fifth of several schematic diagrams illustrating the structure of the energy storage communication system provided in this application.

[0051] Figure 7 This is the sixth of several schematic diagrams of the energy storage communication system provided in some embodiments of this application;

[0052] Figure 8 This is the seventh of several schematic diagrams of the energy storage communication system provided in some embodiments of this application;

[0053] Figure 9 This is the eighth of several schematic diagrams of the energy storage communication system provided in the embodiments of this application;

[0054] Figure 10 This is the ninth of several schematic diagrams illustrating the structure of an energy storage communication system provided in some embodiments of this application;

[0055] Figure 11 This is the tenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0056] Figure 12 This is eleventh of the structural schematic diagrams of the energy storage communication system provided in some embodiments of this application;

[0057] Figure 13 This is the twelfth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0058] Figure 14 This is the thirteenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0059] Figure 15 This is the fourteenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0060] Figure 16 This is the fifteenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0061] Figure 17 This is the sixteenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0062] Figure 18 This is the seventeenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0063] Figure 19 This is the eighteenth of the structural schematic diagrams of the energy storage communication system provided in some embodiments of this application;

[0064] Figure 20 This is the nineteenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0065] Figure 21 This is the twentieth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0066] Figure 22 This is the twenty-first of several schematic diagrams of the energy storage communication system provided in some embodiments of this application;

[0067] Figure 23 This is the twenty-second schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0068] Figure 24 This is the twenty-third schematic diagram of the energy storage communication system provided in some embodiments of this application;

[0069] Figure 25 This is the twenty-fourth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0070] Figure 26 This is the twenty-fifth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0071] Figure 27 This is the twenty-sixth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0072] Figure 28 This is the twenty-seventh schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0073] Figure 29 This is the twenty-eighth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0074] Figure 30 This is the twenty-ninth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application;

[0075] Figure 31 This is a schematic diagram of the structure of an energy storage communication system provided in some embodiments of this application;

[0076] Figure 32 This is a schematic diagram of a third ring network communication channel provided in some embodiments of this application;

[0077] Figure 33 This is the thirty-first schematic diagram of the energy storage communication system provided in some embodiments of this application.

[0078] Figure label:

[0079] 10: Battery cluster-level management unit group; 101: Battery cluster-level management unit; 20: First management unit;

[0080] 201: Battery System Management Unit; 202: Submodule Controller; 203: Submodule Integration Controller;

[0081] 30: Second Management Unit; 301: Energy Storage Valve Control Device; 302: Battery Backend Monitoring System;

[0082] 3011: Main energy storage valve control device; 3012: Backup energy storage valve control device; 40: Battery module management unit group;

[0083] 401: Battery Module Management Unit. Detailed Implementation

[0084] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0085] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0086] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0087] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0088] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0089] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0090] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application are not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these types either.

[0091] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells or multiple battery modules. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0092] In the field of power system energy storage technology, the novel high-voltage direct-connected (HVDC) energy storage technology integrates the voltage source converter (VSC) converter valve with a DC energy storage valve, offering advantages such as high modularity, low system network loss, good economic benefits, and high operational reliability. By integrating the DC energy storage valve onto the DC side of the VSC converter valve, both AC / DC power conversion and energy storage are simultaneously achieved. Compared to traditional energy storage technologies, the novel HVDC direct-connected energy storage system boasts a higher voltage level, larger capacity, and stronger grid regulation and support capabilities, making it of significant research importance for new power systems primarily based on renewable energy sources.

[0093] In related technologies, the secondary communication architecture of a DC-connected energy storage valve is as follows: Figure 1 As shown, the existing architecture primarily adopts a star (linear) topology, which has the following drawbacks: 1. Excessive redundant optical fibers within the submodules lead to overly complex control device design; 2. As the number of submodules increases, the number of optical fibers from the Valve Battery Controller (VBC) to the submodules becomes larger, and the longer fiber optic cable distances increase the risk of failure; 3. Individual communication nodes at the lower level cannot determine the network status and do not support changes in the broadcast communication topology, resulting in reduced communication reliability. The existing secondary communication architecture for DC-connected energy storage valves is not suitable for novel high-voltage DC-connected energy storage systems.

[0094] Figure 2 This is one of the structural schematic diagrams of an energy storage communication system provided in some embodiments of this application, with reference to... Figure 2 The energy storage communication system includes at least one battery cluster-level management unit group 10 and at least one first management unit 20, wherein a battery cluster-level management unit group 10 includes N battery cluster-level management units 101, where N is a positive integer greater than or equal to 2.

[0095] This application does not limit the number of battery cluster-level management units included in a battery cluster-level management unit group. Different battery cluster-level management unit groups may include the same or different numbers of battery cluster-level management units.

[0096] It should be noted that, Figure 2Only one battery cluster-level management unit group 10 and one first management unit 20 are shown in the figure, which is not intended to limit the number of battery cluster-level management unit groups and the number of first management units.

[0097] The adjacent battery cluster-level management units of the N battery cluster-level management units are connected to each other to form a first communication link. The battery cluster-level management units at both ends of the first communication link are connected to one of the first management units to form a first ring network communication channel.

[0098] It is understood that the first communication link includes at least two nodes, each of which is a battery cluster-level management unit 101.

[0099] The string battery management unit (SBMU) 101 is used to monitor, control, and / or protect the string battery cluster, such as statistical analysis of information of the entire string battery module, thermal management of the battery module, logic control of each primary discrete device inside the high-voltage control box, and coordinated control with the string battery stack management unit. The string battery cluster includes multiple battery modules (or battery packs), and each battery module includes multiple individual battery cells. The string battery management unit can also be called a string battery manager, cluster manager, etc. This application embodiment does not limit the naming of the string battery management unit; any electronic device capable of implementing the functions of the string battery management unit mentioned in this application embodiment can replace the string battery management unit.

[0100] The adjacent battery cluster-level management units 101 of the N battery cluster-level management units 101 are interconnected to form a first communication link. The first communication link is connected to a battery cluster-level management unit 101 at both ends, and is connected to a first management unit 20, forming a first ring network communication channel.

[0101] It should be noted that the communication connections mentioned in the embodiments of this application can be implemented using optical fiber interconnection or other media connections, and this application does not impose any limitations on this. The communication connections mentioned in the embodiments of this application can be bidirectional interconnection or unidirectional connection.

[0102] It should be noted that the first management unit is the next higher level management unit above the battery cluster-level management unit, and one first management unit corresponds to one sub-module. If the energy storage system includes Q sub-modules, where each sub-module includes a power module and a battery module, and the battery module includes several battery clusters, then there are Q corresponding first management units. One first management unit forms a first ring network communication channel with multiple battery cluster-level management units, thereby forming at most Q first ring network communication channels. It should be noted that not every first management unit in a sub-module forms a first ring network communication channel with the corresponding multiple battery cluster-level management units. For example, if the energy storage system includes Q sub-modules, Q = Q1 + Q2, the first management units in Q1 sub-modules can form Q1 ring networks with the corresponding multiple battery cluster-level management units, while the first management units in the remaining Q2 sub-modules still use the communication connection methods in related technologies, such as star connection. This application embodiment does not limit this.

[0103] In the above technical solution, adjacent battery cluster-level management units of multiple battery cluster-level management units are connected to form a first communication link. The battery cluster-level management units at both ends of the first communication link are connected to a first management unit, forming a first ring network communication channel. By adopting ring redundant communication, the setting of communication cables can be reduced and the wiring can be simplified when increasing energy storage capacity with multiple clusters. Furthermore, since a ring network is formed, each battery cluster-level management unit in the ring network can determine the network status and broadcast changes in the communication topology to send cluster-level information. The amount of data sent at the cluster level is appropriate, and the link delay for fault reporting can be shortened, thereby improving the reliability of the energy storage communication system.

[0104] Optionally, the first management unit may be a battery system management unit, a management unit consisting of a battery system management unit and a submodule controller, or a management unit that integrates the functions of the battery system management unit and the functions of submodule control.

[0105] In some embodiments, the first management unit is a battery system management unit, and the battery cluster-level management units at both ends of the first communication link are communicatively connected to the battery system management unit. The battery system management unit is used to monitor, control, and / or protect the batteries in the sub-module to which the battery cluster belongs. The battery system management unit is also connected to a sub-module controller, which is connected to the power module in the sub-module to which the battery cluster belongs, and is used to monitor, control, and / or protect the power module.

[0106] In this embodiment, the first management unit is the battery system management unit. As the main controller for the batteries within a submodule of the energy storage system, the battery system management unit monitors, controls, and / or protects the batteries throughout the submodule, such as battery status monitoring and feedback, state of charge (SOC) estimation, and battery cell balancing. Here, "battery" refers to the batteries within the entire submodule. It should be noted that the submodule here refers to the submodule to which the battery cluster belongs.

[0107] The battery system management unit can also be called a battery module controller (BMC). It can also be referred to as a battery module management unit, battery management unit, battery module manager, battery manager, battery management control unit, etc. This application embodiment does not limit the naming of the battery system management unit; any electronic device capable of implementing the functions of the battery system management unit mentioned in this application embodiment can be used to replace the battery system management unit. For ease of description, BMC will be used to refer to the battery system management unit below.

[0108] Optionally, the battery system management unit is typically connected to the sub-module controller (SMC) via optical fiber. The SMC is used to perform status monitoring (or surveillance), control, and / or protection of the power modules within the sub-module, which is the sub-module to which the battery cluster belongs. The power modules can be half-bridge or full-bridge modules, and include power devices (such as IGBTs).

[0109] The submodule controller can also be called a power module controller, power module control unit, power module manager, etc. This application does not limit the naming of the submodule controller; any electronic device capable of implementing the functions of the submodule controller mentioned in this application can be used instead of the submodule controller. For ease of description, SMC will be used to refer to the submodule controller in the following text.

[0110] The BMC also receives control commands from the SMC to drive devices such as bus switches and bypass switches. Through the cooperation of the battery system management unit and the submodule controller, the monitoring, control, and / or protection of the submodules are realized.

[0111] Figure 3 This is a second schematic diagram of the energy storage communication system provided in some embodiments of this application. (Reference) Figure 3The battery cluster-level management unit group 10 includes: the first battery cluster-level management unit 101, the second battery cluster-level management unit 101, the third battery cluster-level management unit 101, ... the Nth battery cluster-level management unit 101, which can be referred to as SBMU1, SBMU2, SBMU3, ... SBMUn, respectively. Adjacent battery cluster-level management units SBMU are interconnected by optical fiber. The battery cluster-level management units SBMU1 & SBMUn at the beginning and end of the ring network are connected to the battery system management unit BMC 201, thus forming a single submodule battery system communication ring network, which can also be called the communication ring network between the battery cluster-level management unit SBMU 101 and the battery system management unit BMC 201.

[0112] Each battery cluster-level management unit (SBMU) sends Y1, Y2…Yn to the battery control unit (BMC), where Y1, Y2…Yn contain detailed information for each battery cluster. The BMC then aggregates and processes this information before sending it to the battery control unit (SMC) or the battery backend monitoring system. Optionally, the detailed information for each battery cluster includes: voltage data, current data, state of charge data, state of health data, state of power data, temperature data, etc.

[0113] This approach primarily uses the BMC as the main controller of the battery system, while the SMC only serves as a backup (battery monitoring) device. The advantage of this approach is that the SMC board requires minimal hardware and software modifications.

[0114] In the above technical solution, adjacent battery cluster-level management units of multiple battery cluster-level management units are connected to form a first communication link. The battery cluster-level management units at both ends of the first communication link are connected to a battery system management unit, forming a communication ring network of a single submodule battery system. This can reduce the setting of communication cables and simplify wiring when increasing energy storage capacity with multiple clusters. Furthermore, since a ring network is formed, each battery cluster-level management unit in the ring network can report cluster-level information, determine network status, and broadcast changes in communication topology, thereby improving the reliability of the energy storage communication system.

[0115] In some embodiments, the battery cluster-level management unit at one end of the first communication link is also communicatively connected to the submodule controller or the battery background monitoring system for transmitting brief information related to battery cluster safety.

[0116] Optionally, this embodiment adds a network for unidirectional transmission of battery cluster details to the submodule controller or battery background monitoring system after the SBMU is connected in series, based on the aforementioned SBMU sending battery cluster details to the BMC. This unidirectional transmission network is used to transmit brief information related to battery cluster safety.

[0117] Figure 4 This is the third of the structural schematic diagrams of the energy storage communication system provided in some embodiments of this application, see reference. Figure 4 A unidirectional communication network is established between the battery cluster-level management units 101: the first battery cluster-level management unit sends cluster 1 information X1 to the second battery cluster-level management unit; the second battery cluster-level management unit adds cluster 2 information X2 and sends it to the third battery cluster-level management unit, and so on. The Nth battery cluster-level management unit adds cluster n information Xn to obtain the summarized information, which is then sent to the SMC 202. X1, X2…Xn represent brief safety-related information for each battery cluster, such as SOC and cell temperature. The SMC 202 summarizes the received detailed battery cluster information and the brief safety-related information and distributes it to the energy storage valve control device 301. In other words, based on the ring network formed by the SBMU and BMC, a communication channel is added between the Nth battery cluster-level management unit and the SMC, and the Nth battery cluster-level management unit sends the summarized safety-related brief information to the SMC.

[0118] Figure 5 This is the fourth of several schematic diagrams of the energy storage communication system provided in some embodiments of this application, see reference. Figure 5 Based on the ring network formed by SBMU and BMC, a unidirectional communication network is connected in series between battery cluster management units 101: the first battery cluster management unit sends cluster 1 information X1 to the second battery cluster management unit, the second battery cluster management unit adds cluster 2 information X2 and sends it to the third battery cluster management unit, and so on. The Nth battery cluster management unit adds cluster n information Xn to obtain the summarized information, and sends the summarized information to the battery background monitoring system 302. Among them, X1, X2, ... Xn are brief information related to safety in each battery cluster, such as SOC, cell temperature, etc.

[0119] It should be noted that, Figure 4 and Figure 5 Communication connections between adjacent SBMUs, and between SBMUs and BMCs, are unidirectional. Optionally, communication connections between adjacent SBMUs, and between SBMUs and BMCs, can also be bidirectional. Optionally, some SBMUs and BMCs can also have point-to-point connections.

[0120] Optionally, in the communication channel transmitting simplified security information, a communication frame consisting of n bytes is used, with each byte segment including i battery cluster security information. To ensure consistency across multiple SBMU programs, each SBMU exposes an adjustable numbering parameter, with the k-th battery cluster assigned the number k. After receiving a data frame from the higher-level SBMU, the k-th SBMU adds its i battery cluster security information to the k-th byte segment before sending it to the next-level SBMU.

[0121] The energy storage communication system provided in this application embodiment adds a unilateral transmission network after the battery cluster-level management unit is connected in series. This network is used to transmit brief information related to battery cluster safety, thereby ensuring that even if the battery system management unit fails, the energy storage valve control device or the battery background monitoring system can still read the safety information of the battery cluster, ensuring the uninterrupted operation of the energy storage system and improving the availability and reliability of the energy storage system.

[0122] In some embodiments, the first management unit is a battery system management unit and a submodule controller, which are communicatively connected. The battery system management unit is used to monitor, control, and / or protect the batteries in the submodule to which the battery cluster belongs. The submodule controller is connected to the power module in the submodule to which the battery cluster belongs and is used to monitor, control, and / or protect the power module. The first and last ends include a first end and a second end. The battery cluster-level management unit at the first end is communicatively connected to the battery system management unit, and the battery cluster-level management unit at the second end is communicatively connected to the submodule controller.

[0123] Figure 6 This is the fifth of several schematic diagrams illustrating the structure of an energy storage communication system provided in some embodiments of this application, such as... Figure 6 As shown, adjacent battery cluster management units (BMCs) of the N battery cluster management units 101 are interconnected to form a first communication link. The BMCs at both ends of this first communication link are respectively connected to the battery system management unit (BMC) 201 and the submodule controller (SMC) 202. The BMC and SMC are also interconnected, forming a first ring network communication channel, which can also be called a communication ring network between the SBMU and the BMC and SMC, achieving ring-based redundant communication. The battery system management unit and the submodule controller are also interconnected.

[0124] In some embodiments, the communication connection described above can be bidirectional. Each Battery Cluster Management Unit (SBMU) sends Y1, Y2…Yn to the Battery Controller (BMC) along a first direction, where Y1, Y2…Yn represent detailed information for each battery cluster. This information is then aggregated and processed by the BMC before being sent to the Storage Controller (SMC) or the battery backend monitoring system. Each SBMU also sends Y1, Y2…Yn to the SMC along a second direction, where the information is aggregated and processed before being sent to the energy storage valve control device. This provides redundant backup of the detailed battery cluster information on both the BMC and SMC. In the event of a single-point failure of the BMC, the SMC can obtain the detailed battery cluster information and continue to effectively monitor, control, and / or protect the batteries in the submodules, ensuring the entire system can still operate normally.

[0125] In some embodiments, the communication connection described above can be unidirectional. Each Battery Cluster Management Unit (SBMU) sends Y1, Y2…Yn to the Battery Controller (BMC) in one direction, where Y1, Y2…Yn represent detailed information for each battery cluster. The BMC aggregates and processes this information before sending it to the Storage Controller (SMC), which then sends it to the energy storage valve control device. Alternatively, the BMC aggregates this information and sends it to the battery backend monitoring system. Alternatively, each Battery Cluster Management Unit (SBMU) sends Y1, Y2…Yn to the SMC in one direction, where Y1, Y2…Yn represent detailed information for each battery cluster. The SMC aggregates and processes this information before sending it to the BMC, which then sends it to the battery backend monitoring system. Alternatively, the SMC aggregates this information and sends it to the energy storage valve control device. Through ring-based redundant communication, the transmission of battery information can be achieved while reducing the amount of communication cables required. The wiring is simple, and each battery cluster-level management unit in the ring network can determine the network status and broadcast changes in the communication topology. Furthermore, the amount of data transmitted at the cluster level is appropriate, and the link delay for fault reporting can be shortened, improving the reliability of the energy storage communication system.

[0126] In the above technical solution, adjacent battery cluster-level management units of N battery cluster-level management units are connected to form a first communication link. The battery cluster-level management units at both ends of the first communication link are connected to the battery system management unit and the submodule controller, respectively, forming a communication ring network between the SBMU and the BMC and SMC. Redundant backup of detailed battery cluster information is implemented on the BMC and SMC. When the BMC fails at a single point, the SMC can obtain detailed battery cluster information and continue to effectively monitor, control and / or protect the submodule batteries, so that the entire system can still operate normally. Through ring redundant communication, the transmission of battery information can be achieved while reducing the setting of communication cables, simplifying the wiring. Each battery cluster-level management unit in the ring network can determine the network status and broadcast changes in the communication topology. The amount of data transmitted at the cluster level is appropriate, and the link delay for fault reporting can be shortened, improving the reliability of the energy storage communication system.

[0127] In some embodiments, the first management unit is a submodule integrated controller, and the battery cluster-level management units at both ends of the first communication link are connected to the submodule integrated controller. The submodule integrated controller is used to monitor, control, and / or protect the batteries and power modules in the submodule to which the battery cluster belongs.

[0128] It should be noted that the sub-module integrated controller is an electronic device that integrates the functions of the SMC board and the BMC board, simplifying the overall communication architecture. The sub-module integrated controller is used to monitor, control, and / or protect the battery and power modules within the entire sub-module. The sub-module integrated controller can also be called a sub-module integrated manager, sub-module integrated management unit, sub-module battery management unit, etc. This application does not limit the naming of the sub-module integrated controller; any electronic device capable of implementing the functions of the sub-module integrated controller mentioned in this application can be used instead. For ease of description, SBMC (Sub-module Battery Management Controller) will be used to refer to the sub-module integrated controller in the following text.

[0129] Figure 7 This is the sixth of several schematic diagrams of the energy storage communication system provided in some embodiments of this application, such as... Figure 7 As shown, the adjacent battery cluster management units of the N battery cluster management units 101 are connected to form a first communication link. The battery cluster management units 101 at both ends of the first communication link are connected to the submodule integrated controller SBMC 203 to form a first ring network communication channel, which can also be called the communication ring network between SBMU and SBMC, realizing ring redundant communication.

[0130] For example, the battery cluster-level management units SBMU1~SBMUn are interconnected by optical fiber. The first and last two ends of the ring network, SBMU1 and SBMUn, are connected to the SBMC, thus forming a ring network. Each battery cluster-level management unit (SBMU) sends Y1, Y2...Yn to the SBMC, where Y1, Y2...Yn are detailed information for each battery cluster. The SBMC summarizes and processes this information before sending it to the energy storage valve control device or the battery background monitoring system.

[0131] In the above technical solution, adjacent battery cluster management units of multiple battery cluster management units are connected to form a first communication link. The battery cluster management units at both ends of the first communication link are connected to a submodule integrated controller, forming a communication ring network between SBMU and SBMC. This reduces the number of communication cables and simplifies wiring. Furthermore, because a ring network is formed, each battery cluster management unit in the ring network can report cluster-level information, determine network status, and broadcast changes in communication topology. The amount of data transmitted for cluster-level information is appropriate, and the link delay for fault reporting can be shortened, thus improving the reliability of the energy storage communication system.

[0132] In some embodiments, the energy storage communication system further includes: a second management unit, wherein the second management unit is the management unit above the first management unit;

[0133] In the case of only one submodule, the submodule controller of the submodule is communicatively connected to the battery system management unit to form a second communication link. Both ends of the second communication link are communicatively connected to the second management unit to form a second ring network communication channel.

[0134] Understandably, in Figure 3 Based on the communication architecture of the energy storage communication system shown (i.e., there is a first ring network communication channel between SBMU and BMC), a second ring network communication channel is added. This embodiment considers the case where only one sub-module of the energy storage system forms a ring network. Figure 8 This is the seventh of several schematic diagrams illustrating the structure of an energy storage communication system provided in some embodiments of this application, such as... Figure 8 As shown, the submodule controller SMC 202 of the submodule is communicatively connected to the battery system management unit BMC 201 of the submodule. Both the submodule controller SMC 202 and the battery system management unit BMC 201 of the submodule are communicatively connected to the second management unit 30, forming a second ring network communication channel.

[0135] In some embodiments, the second management unit 30 includes one of the following:

[0136] Energy storage valve control device;

[0137] An energy storage valve control device and a battery background monitoring system, wherein the energy storage valve control device and the battery background monitoring system are communicatively connected;

[0138] Main energy storage valve control device and backup energy storage valve control device.

[0139] Understandably, the second management unit 30 is equipment related to the energy storage valve control device.

[0140] In this embodiment, the energy storage valve control device is an interface device for the energy storage valve, mainly used to control, monitor, and / or protect the energy storage valve. The energy storage valve control device can also be called a valve controller, valve base control device, energy storage valve control device, etc. This embodiment does not limit the naming of the energy storage valve control device; any electronic device capable of performing the functions of the energy storage valve control device mentioned in this embodiment can be used to replace the energy storage valve control device. For ease of description, VBC can be used to refer to the energy storage valve control device in the following text.

[0141] Originally used for visualizing battery management systems, the battery back-end monitoring system has been gradually improved in energy storage scenarios. In this embodiment, it is used to display key parameters and alarm information of each sub-module, as well as to realize human-machine interaction control of the sub-modules. The battery back-end monitoring system can also be called a back-end monitoring system, monitoring system, etc.

[0142] Optionally, the second management unit 30 is an energy storage valve control device (VBC). Figure 9 This is the eighth schematic diagram of the energy storage communication system provided in some embodiments of this application, see reference. Figure 9 The submodule controller SMC 202 of the submodule is connected to the battery system management unit BMC 201 of the submodule. Both the submodule controller SMC 202 and the battery system management unit BMC 201 of the submodule are connected to the energy storage valve control device VBC 301 to form a second ring network communication channel.

[0143] Optionally, the second management unit 30 comprises an energy storage valve control device (VBC) and a battery backend monitoring system, wherein the energy storage valve control device (VBC) and the battery backend monitoring system are communicatively connected. Figure 10 This is the ninth of several schematic diagrams illustrating the structure of an energy storage communication system provided in some embodiments of this application, with reference to... Figure 10 The submodule controller SMC 202 of this submodule is communicatively connected to the battery system management unit BMC 201 of the same submodule. The SMC 202 is also communicatively connected to the energy storage valve control device VBC 301, and the BMC 201 is communicatively connected to the battery background monitoring system 302, forming a second ring network communication channel. In another embodiment, optionally, the SMC of this submodule is communicatively connected to the battery background monitoring system 302, and the BMC is communicatively connected to the energy storage valve control device VBC 301, forming a second ring network communication channel.

[0144] It should be noted that the battery back-end monitoring system 302 mainly receives battery information from the BMC and sends remote control commands (including high voltage adjustment commands, maintenance and testing commands, etc.). By adding the battery back-end monitoring system 302 to the second ring network communication channel, it is equivalent to backing up the battery status monitoring function of the energy storage valve control device VBC 301. Since the core of the energy storage scenario is the battery, battery failure will affect the reliability of the entire system. Backing up the core function is a reliable and efficient choice.

[0145] Optionally, the second management unit 30 includes a primary energy storage valve control device and a backup energy storage valve control device. As the brain of the entire energy storage valve, the energy storage valve control device can be redundantly backed up in terms of either hardware or software to prevent software or hardware failures, thus further improving the reliability of the energy storage valve.

[0146] The following explanation uses the example of an energy storage valve control device with hardware redundancy backup. Figure 11 This is the tenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application, with reference to... Figure 11 The submodule controller SMC 202 of this submodule is communicatively connected to the battery system management unit BMC 201 of this submodule. The submodule controller SMC 202 of this submodule is communicatively connected to the main energy storage valve control device (main VBC) 3011 and the backup energy storage valve control device (backup VBC) 3012. The battery system management unit BMC 201 of this submodule is communicatively connected to the main energy storage valve control device (main VBC) 3011 and the backup energy storage valve control device (backup VBC) 3012. The main energy storage valve control device 3011 and the backup energy storage valve control device 3012 are interconnected to form a second ring network communication channel.

[0147] In the above technical solution, based on the first ring network communication channel formed by the SBMU and BMC, a second ring network communication channel is added, consisting of the SMC, BMC, and a second management unit. The second management unit is a device related to the energy storage valve control device, which can still achieve communication with the energy storage valve control device when the SMC or BMC fails at a single point, without interrupting the monitoring of the submodule's battery. Furthermore, the second management unit can be the energy storage valve control device and the battery background monitoring system, the main energy storage valve control device and the backup energy storage valve control device, thus improving the reliability of the energy storage system.

[0148] In some embodiments, the energy storage communication system further includes: a second management unit, wherein the second management unit is the management unit above the first management unit;

[0149] In the case of at least two sub-modules, within a sub-module, the sub-module controller of the sub-module is communicatively connected to the battery system management unit. Between adjacent sub-modules, the battery system management unit or sub-module controller of the preceding sub-module is communicatively connected to the battery system management unit or sub-module controller of the following sub-module, forming a second communication link. Both ends of the second communication link are communicatively connected to the second management unit, forming a second ring network communication channel.

[0150] Understandably, in Figure 3 Based on the communication architecture of the energy storage communication system shown (i.e., the first ring network communication channel is formed between SBMU and BMC), a second ring network communication channel is added. This embodiment considers the case where at least two sub-modules of the energy storage system form a ring network. Figure 12 This is eleventh of the structural schematic diagrams of the energy storage communication system provided in some embodiments of this application, as shown below. Figure 12As shown, within a submodule, the submodule controller SMC 202 of the submodule is communicatively connected to the battery system management unit BMC 201. Between adjacent submodules, the battery system management unit BMC 201 or submodule controller SMC 202 of the preceding submodule is communicatively connected to the battery system management unit BMC 201 or submodule controller SMC 202 of the following submodule, forming a second communication link. Both ends of the second communication link are communicatively connected to the second management unit 30, forming a second ring network communication channel.

[0151] It should be noted that, Figure 12 The diagram only shows the first ring network communication channel formed between N SBMUs and BMC1, and this is not intended to limit the number of first ring network communication channels. Other BMCs can also form first ring network communication channels with multiple SBMUs. Figure 12 The same applies to other accompanying figures, which will not be repeated here.

[0152] Optionally, the second management unit is an energy storage valve control device (VBC). Figure 13 This is the twelfth schematic diagram of the structure of an energy storage communication system provided in some embodiments of this application, with reference to... Figure 13 Between adjacent submodules, the battery system management unit (BMC) 201 or submodule controller (SMC) 202 of the preceding submodule is communicatively connected to the battery system management unit (BMC) 201 or submodule controller (SMC) 202 of the following submodule, forming a second communication link. Both ends of the second communication link are communicatively connected to the energy storage valve control device (VBC) 301, forming a second ring network communication channel.

[0153] Optionally, the second management unit comprises an energy storage valve control device (VBC) and a battery backend monitoring system, wherein the energy storage valve control device (VBC) and the battery backend monitoring system are communicatively connected. Figure 14 This is the thirteenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application, with reference to... Figure 14The energy storage system comprises multiple sub-modules. Within each sub-module, the sub-module controller (SMC) 202 is communicatively connected to the battery system management unit (BMC) 201. Between adjacent sub-modules, the BMC 201 or SMC 202 of the preceding sub-module is communicatively connected to the BMC 201 or SMC 202 of the following sub-module, forming a second communication link. The first end of the second communication link is communicatively connected to the energy storage valve control device (VBC) 301, and the second end of the second communication link is communicatively connected to the battery backend monitoring system 302, forming a second ring network communication channel. Alternatively, the first end of the second communication link is communicatively connected to the battery backend monitoring system 302, and the second end of the second communication link is communicatively connected to the energy storage valve control device (VBC) 301, forming a second ring network communication channel.

[0154] It should be noted that the battery back-end monitoring system 302 mainly receives battery information from the BMC 201 and sends remote control commands (including high voltage adjustment commands, maintenance and testing commands, etc.). By adding the battery back-end monitoring system 302 to the second ring network communication channel, it is equivalent to backing up the battery status monitoring function of the energy storage valve control device VBC 301. Since the core of the energy storage scenario is the battery, battery failure will affect the reliability of the entire system. Backing up the core function is a reliable and efficient choice.

[0155] Optionally, the second management unit comprises a primary energy storage valve control device and a backup energy storage valve control device. As the brain of the entire energy storage valve, the energy storage valve control device can be redundantly backed up in terms of either hardware or software to prevent software or hardware failures, thus further improving the reliability of the energy storage valve. The following explanation uses hardware redundancy backup of the energy storage valve control device as an example. Figure 15 This is the fourteenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application, with reference to... Figure 15Within a submodule, the submodule controller SMC 202 is communicatively connected to the battery system management unit BMC 201. Between adjacent submodules, the battery system management unit BMC 201 or submodule controller SMC 202 of the preceding submodule is communicatively connected to the battery system management unit BMC 201 or submodule controller SMC 202 of the following submodule, forming a second communication link. The battery system management unit BMC 201 or submodule controller SMC at the first end of the second communication link is communicatively connected to the main energy storage valve control device (main VBC) 3011 and the backup energy storage valve control device (backup VBC) 3012. The battery system management unit BMC at the second end of the second communication link... The 201 or submodule controller SMC202 is communicatively connected to the main energy storage valve control device (main VBC) 3011 and the backup energy storage valve control device (backup VBC) 3012. The main energy storage valve control device 3011 and the backup energy storage valve control device 3012 are interconnected to form a second ring network communication channel.

[0156] In the above technical solution, when dealing with at least two sub-modules, a second ring network communication channel is added, consisting of the SMC, BMC, and a second management unit, based on the first ring network communication channel formed by the SBMU and BMC. The second management unit is a device related to the energy storage valve control device, which can still achieve communication with the energy storage valve control device even when the SMC or BMC fails at a single point, without interrupting the monitoring of the sub-module's battery. Furthermore, the second management unit can be the energy storage valve control device and the battery background monitoring system, the main energy storage valve control device and the backup energy storage valve control device, thereby improving the reliability of the energy storage system.

[0157] In some embodiments, the energy storage communication system further includes: a second management unit, wherein the second management unit is the management unit above the first management unit;

[0158] In the case of only one submodule, the first management unit and the second management unit are connected to form a second ring network communication channel.

[0159] In some embodiments, Figure 6 Based on the communication architecture of the energy storage communication system shown (i.e., the first ring network communication channel is formed between SBMU, BMC, and SMC), a second ring network communication channel is added. This embodiment considers the case where only one sub-module of the energy storage system forms a ring network. Figure 16 This is the fifteenth schematic diagram of the structure of an energy storage communication system provided in some embodiments of this application, as shown below. Figure 16 As shown, the first management unit is the battery system management unit BMC 201 and the submodule controller SMC 202 of this submodule. The first management unit 20 and the second management unit 30 are communicatively connected to form a second ring network communication channel.

[0160] Optionally, the second management unit is an energy storage valve control device (VBC). Figure 17 This is the sixteenth schematic diagram of the structure of an energy storage communication system provided in some embodiments of this application, with reference to... Figure 17 The submodule controller SMC 202 of the submodule is connected to the battery system management unit BMC 201 of the submodule. Both the submodule controller SMC 202 and the battery system management unit BMC 201 of the submodule are connected to the energy storage valve control device VBC 301 to form a second ring network communication channel.

[0161] Optionally, the second management unit comprises an energy storage valve control device (VBC) and a battery backend monitoring system, wherein the energy storage valve control device (VBC) and the battery backend monitoring system are communicatively connected. Figure 18 This is the seventeenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application, see reference. Figure 18 The submodule controller SMC 202 of this submodule is communicatively connected to the battery system management unit BMC 201 of the same submodule. The submodule controller SMC 202 is also communicatively connected to the energy storage valve control device VBC 301, and the battery system management unit BMC 201 is communicatively connected to the battery background monitoring system 302, forming a second ring network communication channel. In another embodiment, optionally, the submodule controller SMC 201 of this submodule is communicatively connected to the battery background monitoring system 302, and the battery system management unit BMC 201 is communicatively connected to the energy storage valve control device VBC 301, forming a second ring network communication channel.

[0162] Optionally, the second management unit is a main energy storage valve control device and a backup energy storage valve control device. Figure 19 This is the eighteenth schematic diagram of the energy storage communication system provided in some embodiments of this application, with reference to... Figure 19 The submodule controller SMC 202 of this submodule is communicatively connected to the battery system management unit BMC 201 of this submodule. The submodule controller SMC 202 of this submodule is communicatively connected to the main energy storage valve control device (main VBC) 3011 and the backup energy storage valve control device (backup VBC) 3012. The battery system management unit BMC 201 of this submodule is communicatively connected to the main energy storage valve control device 3011 (main VBC) and the backup energy storage valve control device (backup VBC) 3012. The main energy storage valve control device and the backup energy storage valve control device are interconnected to form a second ring network communication channel.

[0163] In the above technical solution, based on the first ring network communication channel formed by SBMU, BMC, and SMC, a second ring network communication channel is added, consisting of BMC, SMC, and a second management unit. The second management unit is a device related to the energy storage valve control device, which can still achieve communication with the energy storage valve control device even when the SMC or BMC fails at a single point, without interrupting the monitoring of the submodule's battery. Furthermore, the second management unit can be the energy storage valve control device and the battery background monitoring system, or the main energy storage valve control device and the backup energy storage valve control device, thus realizing the backup of the battery status monitoring function and improving the reliability of the energy storage system.

[0164] In other embodiments, Figure 7 Based on the communication architecture of the energy storage communication system shown (i.e., the first ring network communication channel is formed between SBMU and SBMC), a second ring network communication channel is added. This embodiment considers the case where only one sub-module of the energy storage system forms a ring network. Figure 20 This is the nineteenth schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application, as shown below. Figure 20 As shown, the first management unit 20 is the submodule integrated controller SBMC 203 of this submodule. The first management unit 20 and the second management unit 30 are communicatively connected to form a second ring network communication channel.

[0165] Optionally, the second management unit is an energy storage valve control device (VBC). Figure 21 This is the twentieth schematic diagram of the structure of an energy storage communication system provided in some embodiments of this application, with reference to... Figure 21 The submodule integrated controller SBMC 203 of this submodule is communicatively connected to the energy storage valve control device VBC 301 to form a second ring network communication channel.

[0166] Optionally, the second management unit comprises an energy storage valve control device (VBC) and a battery backend monitoring system, wherein the energy storage valve control device (VBC) and the battery backend monitoring system are communicatively connected. Figure 22 This is the twenty-first schematic diagram of the energy storage communication system provided in some embodiments of this application, see reference. Figure 22 The submodule integrated controller SBMC 203 of this submodule is communicatively connected with the energy storage valve control device VBC 301 and the battery background monitoring system 302 to form a second ring network communication channel.

[0167] Optionally, the second management unit is a main energy storage valve control device and a backup energy storage valve control device. Figure 23 This is the twenty-second schematic diagram of the structure of an energy storage communication system provided in some embodiments of this application, see reference. Figure 23The submodule integrated controller SBMC 203 of this submodule is communicatively connected to the main energy storage valve control device (main VBC) 3011 and the backup energy storage valve control device (backup VBC) 3012. The main energy storage valve control device 3011 and the backup energy storage valve control device 3012 are interconnected to form a second ring network communication channel.

[0168] In the above technical solution, based on the first ring network communication channel formed by SBMU and SBMC, a second ring network communication channel is added, formed by SBMC and the second management unit. The second management unit is a device related to the energy storage valve control device, which reduces the setting of communication cables, simplifies the wiring, and, since two ring networks are formed, each battery cluster-level management unit in the first ring network can determine the network status and broadcast changes in the communication topology. Furthermore, the second management unit can be the energy storage valve control device and the battery background monitoring system, or the main energy storage valve control device and the backup energy storage valve control device, realizing backup of the battery status monitoring function and improving the reliability of the energy storage system.

[0169] In some embodiments, the energy storage communication system further includes: a second management unit, wherein the second management unit is the management unit above the first management unit;

[0170] In the case of at least two sub-modules, the first management unit of the preceding sub-module and the first management unit of the following sub-module are connected to each other to form a second communication link. Both ends of the second communication link are connected to the second management unit to form a second ring network communication channel.

[0171] In some embodiments, Figure 6 Based on the communication architecture of the energy storage communication system shown (i.e., the first ring network communication channel is formed between SBMU, BMC, and SMC), a second ring network communication channel is added. This embodiment considers the case where the energy storage system includes at least two sub-modules. Figure 24 This is the twenty-third schematic diagram of the energy storage communication system provided in some embodiments of this application, as shown below. Figure 24 As shown, the first management unit is the battery system management unit BMC 201 and the submodule controller SMC 202 of the submodule. Between adjacent submodules, the battery system management unit BMC 201 or the submodule controller SMC 202 of the previous submodule is connected to the battery system management unit BMC 201 or the submodule controller SMC 202 of the next submodule to form a second communication link. Both ends of the second communication link are connected to the second management unit 30 to form a second ring network communication channel.

[0172] Optionally, the second management unit is an energy storage valve control device (VBC). Figure 25This is the twenty-fourth schematic diagram of the energy storage communication system provided in some embodiments of this application, see reference. Figure 25 Between adjacent sub-modules, the first management unit of the previous sub-module communicates with the first management unit of the next sub-module to form a second communication link. The first management units at both ends of the second communication link are connected to the energy storage valve control device VBC 301 to form a second ring network communication channel.

[0173] Optionally, the second management unit comprises an energy storage valve control device (VBC) and a battery backend monitoring system, wherein the energy storage valve control device (VBC) and the battery backend monitoring system are communicatively connected. Figure 26 This is the twenty-fifth schematic diagram of the energy storage communication system provided in some embodiments of this application, see reference. Figure 26 Between adjacent submodules, the battery system management unit (BMC) 201 or submodule controller (SMC) 202 of the preceding submodule is communicatively connected to the battery system management unit (BMC) 201 or submodule controller (SMC) 202 of the following submodule, forming a second communication link. The first end of the second communication link can be BMC1 or SMC1 in the first management unit of the first end, which is communicatively connected to the energy storage valve control device (VBC) 301. The second end of the second communication link can be BMCn or SMCn in the first management unit of the second end, which is communicatively connected to the battery background monitoring system 302, forming a second ring network communication channel. In another embodiment, optionally, the first end of the second communication link can be BMC1 or SMC1 in the first management unit of the first end, which is communicatively connected to the battery background monitoring system 302. The second end of the second communication link can be BMCn or SMCn in the first management unit of the second end, which is communicatively connected to the energy storage valve control device (VBC) 301, forming a second ring network communication channel.

[0174] Optionally, the second management unit is a main energy storage valve control device and a backup energy storage valve control device. Figure 27 This is the twenty-sixth schematic diagram of the energy storage communication system provided in some embodiments of this application, see reference. Figure 27Within a submodule, the submodule controller SMC 202 is communicatively connected to the battery system management unit BMC 201. Between adjacent submodules, the battery system management unit BMC 201 or submodule controller SMC 202 of the preceding submodule is communicatively connected to the battery system management unit BMC 201 or submodule controller SMC 202 of the following submodule, forming a second communication link. The battery system management unit BMC 201 or submodule controller SMC 202 at the first end of the second communication link is communicatively connected to the main energy storage valve control device (main VBC) 3011 and the backup energy storage valve control device (backup VBC) 3012. The battery system management unit BMC 201 or submodule controller SMC 202 at the second end of the second communication link is also communicatively connected. 202, is communicatively connected to the main energy storage valve control device (main VBC) 3011 and the backup energy storage valve control device (backup VBC) 3012, and the main energy storage valve control device 3011 and the backup energy storage valve control device 3012 are interconnected to form a second ring network communication channel.

[0175] In the above technical solution, based on the first ring network communication channel formed by SBMU, BMC, and SMC, a second ring network communication channel is added, consisting of BMC, SMC, and a second management unit. The second management unit is a device related to the energy storage valve control device, which can still communicate with the energy storage valve control device even when the SMC or BMC fails at a single point. This ensures that the energy storage valve control device can receive battery information and will not interrupt the monitoring of the submodule's battery. Furthermore, the second management unit in the second ring network can be the energy storage valve control device and the battery background monitoring system, or the main energy storage valve control device and the backup energy storage valve control device, thus achieving backup of the battery status monitoring function and improving the reliability of the energy storage system.

[0176] In other embodiments, Figure 7 Based on the communication architecture of the energy storage communication system shown (i.e., the first ring network communication channel is formed between SBMU and SBMC), a second ring network communication channel is added. This embodiment considers the case where the energy storage system includes at least two sub-modules. Figure 28 This is the twenty-seventh schematic diagram of the structure of the energy storage communication system provided in some embodiments of this application, as shown below. Figure 28 As shown, the first management unit is the submodule integration controller SBMC 203 of the submodule. Between adjacent submodules, the submodule integration controller SBMC 203 of the previous submodule and the submodule integration controller SBMC 203 of the next submodule are connected to form a second communication link. Both ends of the second communication link are connected to the second management unit 30 to form a second ring network communication channel.

[0177] Optionally, the second management unit is an energy storage valve control device (VBC). Figure 29This is the twenty-eighth schematic diagram of the structure of an energy storage communication system provided in some embodiments of this application, see reference. Figure 29 The first management unit is the submodule integrated controller SBMC 203 of the submodule. Between adjacent submodules, the submodule integrated controller SBMC 203 of the previous submodule and the submodule integrated controller SBMC 203 of the next submodule are connected to form a second communication link. The two ends of the second communication link (i.e., SBMC1 and SBMCn) are connected to the energy storage valve control device VBC 301 to form a second ring network communication channel.

[0178] Optionally, the second management unit comprises an energy storage valve control device (VBC) and a battery backend monitoring system, wherein the energy storage valve control device (VBC) and the battery backend monitoring system are communicatively connected. Figure 30 This is the twenty-ninth schematic diagram of the energy storage communication system provided in some embodiments of this application, see reference. Figure 30 Between adjacent submodules, the submodule integrated controller SBMC 203 of the previous submodule communicates with the submodule integrated controller SBMC 203 of the next submodule to form a second communication link. The submodule integrated controller SBMC1 at the first end of the second communication link is connected to the energy storage valve control device VBC 301, and the submodule integrated controller SBMCn at the second end of the second communication link is connected to the battery background monitoring system 302 to form a second ring network communication channel.

[0179] Optionally, the second management unit is a main energy storage valve control device and a backup energy storage valve control device. Figure 31 This is a schematic diagram of the structure of an energy storage communication system provided in some embodiments of this application, referred to as 30. Figure 31 Between adjacent submodules, the submodule integrated controller SBMC 203 of the previous submodule communicates with the submodule integrated controller SBMC 203 of the next submodule, forming a second communication link. The submodule integrated controllers SBMC 203 at both ends of the second communication link are respectively connected to the main energy storage valve control device 3011 and the backup energy storage valve control device 3012. That is, the SBMC (i.e., SBMC1) at the first end of the second communication link and the SBMC (i.e., SBMCn) at the second end of the second communication link are both connected to the main energy storage valve control device 3011. The SBMC (i.e., SBMC1) at the first end of the second communication link and the SBMC (i.e., SBMCn) at the second end of the second communication link are also connected to the backup energy storage valve control device 3012, forming a second ring network communication channel.

[0180] In the above technical solution, based on the first ring network communication channel formed by SBMU and SBMC, a second ring network communication channel is added, formed by SBMC and the second management unit. The second management unit is a device related to the energy storage valve control device, which reduces the setting of communication cables, simplifies the wiring, and, since two ring networks are formed, each battery cluster-level management unit in the first ring network can determine the network status and broadcast changes in the communication topology. Furthermore, the second management unit in the second ring network can be the energy storage valve control device and the battery background monitoring system, or the main energy storage valve control device and the backup energy storage valve control device, realizing backup of the battery status monitoring function and improving the reliability of the energy storage system.

[0181] In some embodiments, both ends of the second communication link are connected to the second management unit to form a second ring network communication channel, including one of the following:

[0182] Both the first end and the second end of the second communication link are connected to the energy storage valve control device to form a second ring network communication channel;

[0183] The first end of the second communication link is connected to the energy storage valve control device, and the second end of the second communication link is connected to the battery background monitoring system, forming a second ring network communication channel;

[0184] Both the first end and the second end of the second communication link are connected to the main energy storage valve control device, and both the first end and the second end of the second communication link are also connected to the backup energy storage valve control device.

[0185] With the second management unit consisting of an energy storage valve control device, an energy storage valve control device and a battery background monitoring system, a main energy storage valve control device and a backup energy storage valve control device, the connection relationship between the first end of the second communication link and the second end of the second communication link is as described above, which can realize the second ring network communication channel and improve the reliability of the energy storage system.

[0186] In some embodiments, the energy storage valve control device is an energy storage valve control device that integrates the battery background monitoring system function, or an energy storage valve control device that has undergone software backup.

[0187] In other words, a battery monitoring system is not strictly necessary; its control functions can be integrated into the energy storage valve control device. Even if the battery monitoring system malfunctions, the ring network can still operate normally, and each communication node can determine the network status and broadcast changes in the communication topology, ensuring uninterrupted communication and improving the reliability of the energy storage system.

[0188] Based on the above embodiments, the energy storage communication system further includes: at least one battery module management unit group, wherein one battery module management unit group includes M battery module management units, where M is a positive integer greater than or equal to 2.

[0189] The adjacent battery module management units of the M battery module management units are connected to each other to form a third communication link. The battery module management units at both ends of the third communication link are connected to a battery cluster-level management unit to form a third ring network communication channel. The battery module management unit is used to monitor, control and / or protect each battery cell in the battery module.

[0190] The Cell Supervisory Controller (CSC) is primarily used to monitor the voltage and temperature parameters of each individual battery cell (cell) within the battery module. The CSC transmits the collected data to the Battery Supervisory Controller (SBMU) via optical fiber, and the SBMU then uploads the data. The Cell Supervisory Controller can also be referred to as a Battery Module Manager, Battery Module Control Unit, or Battery Monitoring Unit. This application does not limit the naming of the Cell Supervisory Controller; any electronic device capable of performing the functions of the Cell Supervisory Controller mentioned in this application can replace the Cell Supervisory Controller.

[0191] The energy storage communication system includes at least one battery module management unit group. A battery module management unit group includes M battery module management units, where M is a positive integer greater than or equal to 2. It should be noted that the number of battery module management units contained in different battery module management unit groups may be the same or different. This application does not limit the number of battery module management units contained in each group of battery module management units.

[0192] A group of battery module management units (BMUs) and a battery cluster management unit (SBMU) form a third ring network communication channel. In other words, P groups of BMUs and P SBMUs form P third ring network communication channels.

[0193] It should be noted that the embodiments of this application can be implemented as described above. Figures 2-31 Based on this, a third ring network communication channel was added, enabling cell-level monitoring, control, and / or protection of the lower layer of the battery cluster-level management unit.

[0194] Figure 32 This is a schematic diagram of a third ring network communication channel provided in some embodiments of this application. (Reference) Figure 32The energy storage communication system further includes: at least one battery module management unit group 40, which includes M battery module management units 401. Adjacent battery module management units CSC 401 of the M battery module management units CSC 401 are connected to each other to form a third communication link. The battery module management units CSC 401 at both ends of the third communication link are connected to a battery cluster level management unit SBMU 101 to form a third ring network communication channel.

[0195] The embodiments of this application can be described in the foregoing Figures 2-31 Based on the energy storage communication system shown in any of the figures, superimposed Figure 32 The third ring network communication channel shown in the diagram results in a ring redundant communication architecture. The entire architecture is clear, has strong accessibility and scalability, can support the design of communication systems for most energy storage scenarios, and has a clear network hierarchy, making it easy to locate problems.

[0196] For example, Figure 33 This is the thirty-first of several schematic diagrams of the energy storage communication system provided in some embodiments of this application. Figure 33 Is Figure 24 On the basis of Figure 32 The energy storage communication system, as shown in the diagram, comprises a first ring network communication channel, a second ring network communication channel, and a third ring network communication channel, forming a three-layer ring redundant communication architecture. It should be noted that... Figure 33 The diagram only shows the formation of a third ring network communication channel between M CSCs and the second SBMU, and this is not intended to limit the number of third ring network communication channels. Other SBMUs can also form third ring network communication channels with multiple CSCs. Figure 33 Not shown in the image.

[0197] The energy storage communication system provided in this application embodiment uses a decentralized ring network redundant communication method. Through a fast communication protocol and ring redundant communication logic, it can solve the problem of submodule communication failure. That is, even if a single point of failure occurs, the entire system can still operate normally and does not rely on a monitoring system or other control equipment. The monitoring system only plays a supervisory and management role for the submodules. Therefore, if the monitoring system fails, the ring network can still work normally. Moreover, each communication node can determine the network status and broadcast changes in the communication topology, ensuring uninterrupted communication of the ring network and improving the reliability of the energy storage system.

[0198] In some embodiments, the communication connection described above is a bidirectional communication connection or a unidirectional communication connection.

[0199] This application also provides an energy storage system, including the energy storage communication system as described in the above embodiments. For a better understanding of the energy storage system, please refer to the description of the energy storage communication system in the above embodiments, which achieves the same technical effects and will not be repeated here.

[0200] In some embodiments, the energy storage system is a DC-connected energy storage system, such as a novel high-voltage DC-connected energy storage system. It is understood that applying the energy storage communication system provided in this application to a DC-connected energy storage system can reduce the arrangement of communication cables, decrease the design complexity of submodules, and effectively improve the communication reliability of the DC-connected energy storage system.

[0201] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0202] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An energy storage communication system, characterized in that, include: The system includes at least one battery cluster-level management unit group and at least one first management unit, wherein a battery cluster-level management unit group comprises N battery cluster-level management units, where N is a positive integer greater than or equal to 2. The adjacent battery cluster-level management units of the N battery cluster-level management units are connected to each other to form a first communication link. The battery cluster-level management units at both ends of the first communication link are connected to one of the first management units to form a first ring network communication channel. The battery cluster-level management unit is used to monitor, control and / or protect the battery clusters, and the first management unit is the management unit above the battery cluster-level management unit. Wherein, the first management unit is a battery system management unit, or the first management unit is a battery system management unit and a submodule controller, or the first management unit is a submodule integrated controller; The battery system management unit is used to monitor, control, and / or protect the batteries in the sub-module to which the battery cluster belongs; the sub-module controller is connected to the power module in the sub-module to which the battery cluster belongs, and is used to monitor, control, and / or protect the power module; the sub-module integrated controller is used to monitor, control, and / or protect the batteries and power module in the sub-module to which the battery cluster belongs. In the case where the first management unit is the battery system management unit, the battery system management unit is also connected to the submodule controller; When the first management unit is the battery system management unit and the submodule controller, the battery system management unit and the submodule controller are connected in communication.

2. The energy storage communication system according to claim 1, characterized in that, When the first management unit is a battery system management unit, the battery cluster-level management units at both ends of the first communication link are communicatively connected to the battery system management unit.

3. The energy storage communication system according to claim 2, characterized in that, The battery cluster-level management unit at one end of the first communication link is also connected to the submodule controller or the battery background monitoring system for transmitting brief information related to battery cluster safety.

4. The energy storage communication system according to claim 1, characterized in that, When the first management unit is the battery system management unit and the submodule controller, the two ends include a first end and a second end. The battery cluster-level management unit of the first end is communicatively connected to the battery system management unit, and the battery cluster-level management unit of the second end is communicatively connected to the submodule controller.

5. The energy storage communication system according to claim 1, characterized in that, When the first management unit is the submodule integrated controller, the battery cluster-level management units at both ends of the first communication link are connected to the submodule integrated controller.

6. The energy storage communication system according to claim 2, characterized in that, The energy storage communication system further includes: a second management unit, which is the management unit above the first management unit; In the case of only one submodule, the submodule controller of the submodule is communicatively connected to the battery system management unit to form a second communication link. Both ends of the second communication link are communicatively connected to the second management unit to form a second ring network communication channel. In the case of at least two sub-modules, within a sub-module, the sub-module controller of the sub-module is communicatively connected to the battery system management unit. Between adjacent sub-modules, the battery system management unit or sub-module controller of the preceding sub-module is communicatively connected to the battery system management unit or sub-module controller of the following sub-module, forming a second communication link. Both ends of the second communication link are communicatively connected to the second management unit, forming a second ring network communication channel.

7. The energy storage communication system according to claim 3, characterized in that, The energy storage communication system further includes: a second management unit, which is the management unit above the first management unit; In the case of only one submodule, the submodule controller of the submodule is communicatively connected to the battery system management unit to form a second communication link. Both ends of the second communication link are communicatively connected to the second management unit to form a second ring network communication channel. In the case of at least two sub-modules, within a sub-module, the sub-module controller of the sub-module is communicatively connected to the battery system management unit. Between adjacent sub-modules, the battery system management unit or sub-module controller of the preceding sub-module is communicatively connected to the battery system management unit or sub-module controller of the following sub-module, forming a second communication link. Both ends of the second communication link are communicatively connected to the second management unit, forming a second ring network communication channel.

8. The energy storage communication system according to claim 4, characterized in that, The energy storage communication system further includes: a second management unit, which is the management unit above the first management unit; In the case of only one submodule, the first management unit and the second management unit are connected to form a second ring network communication channel; In the case of at least two sub-modules, the first management unit of the preceding sub-module and the first management unit of the following sub-module are connected to each other to form a second communication link. Both ends of the second communication link are connected to the second management unit to form a second ring network communication channel.

9. The energy storage communication system according to claim 5, characterized in that, The energy storage communication system further includes: a second management unit, which is the management unit above the first management unit; In the case of only one submodule, the first management unit and the second management unit are connected to form a second ring network communication channel; In the case of at least two sub-modules, the first management unit of the preceding sub-module and the first management unit of the following sub-module are connected to each other to form a second communication link. Both ends of the second communication link are connected to the second management unit to form a second ring network communication channel.

10. The energy storage communication system according to any one of claims 6-9, characterized in that, The second management unit includes one of the following: Energy storage valve control device; An energy storage valve control device and a battery background monitoring system, wherein the energy storage valve control device and the battery background monitoring system are communicatively connected; Main energy storage valve control device and backup energy storage valve control device.

11. The energy storage communication system according to claim 10, characterized in that, Both ends of the second communication link are communicatively connected to the second management unit, forming a second ring network communication channel, including one of the following: Both the first end and the second end of the second communication link are connected to the energy storage valve control device to form a second ring network communication channel; The first end of the second communication link is connected to the energy storage valve control device, and the second end of the second communication link is connected to the battery background monitoring system, forming a second ring network communication channel; Both the first end and the second end of the second communication link are connected to the main energy storage valve control device, and both the first end and the second end of the second communication link are also connected to the backup energy storage valve control device.

12. The energy storage communication system according to claim 10, characterized in that, The energy storage valve control device is an energy storage valve control device that integrates the battery background monitoring system function, or an energy storage valve control device that has undergone software backup.

13. The energy storage communication system according to any one of claims 1-9 and 11-12, characterized in that, The energy storage communication system further includes: at least one battery module management unit group, wherein one battery module management unit group includes M battery module management units, where M is a positive integer greater than or equal to 2. The adjacent battery module management units of the M battery module management units are connected to each other to form a third communication link. The battery module management units at both ends of the third communication link are connected to a battery cluster-level management unit to form a third ring network communication channel. The battery module management unit is used to monitor, control and / or protect each battery cell in the battery module.

14. The energy storage communication system according to any one of claims 1-9 and 11-12, characterized in that, The communication connection can be a two-way communication connection or a one-way communication connection.

15. An energy storage system, characterized in that, Includes the energy storage communication system as described in any one of claims 1 to 14.

16. The energy storage system according to claim 15, characterized in that, The energy storage system is a DC-connected energy storage system.

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