Control box body of string type energy storage system, battery cluster and string type energy storage system

Abstract

The utility model provides a control box body of a string type energy storage system, a battery cluster and the string type energy storage system. The control box body is electrically connected with a battery module; the control box body comprises a box body shell, wherein an open containing space is formed in the box body shell; the integrated tray is arranged in the accommodating space, is used for mounting electrical elements, and can move relative to the length direction of the box body shell; the box body door is arranged at the opening of the accommodating space; wherein the electrical element at least comprises an integrated control unit which is respectively connected with the battery module and an external power grid. According to the utility model, by adopting the integrated arrangement, all electrical elements are arranged on the integrated tray, and the integrated tray adopts a drawable structure, so that the space utilization rate and the energy density are improved, the cost is reduced, and meanwhile, the requirements of a string type energy storage system with single-row single-cluster and single-row multi-cluster battery arrangement can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage equipment, and in particular to a control box of a string type energy storage system and a string type energy storage system. Background Art

[0002] In traditional energy storage solutions, battery modules are directly connected in parallel, and the voltage is forced to be balanced. When charging, if one battery cell is fully charged, all parallel battery clusters must stop charging. Similarly, when discharging, if one battery cell is empty, all parallel battery clusters must stop discharging. At present, the mainstream technology of energy storage battery applications is generally applied to the power supply system in a centralized manner of energy storage cabinets, that is, centralized energy storage technology, through the DC parallel connection of battery clusters, and then the DC is converted into AC through the energy storage converter. This method is simple to control, but when the voltage between battery clusters is inconsistent, it may cause circulation problems. In addition, there are several battery cells in a large container. If the temperature control is not done well, the local temperature is too high, affecting the service life of the single battery or even the entire system. At the same time, all the battery cells in the energy storage cabinet are placed together, and the battery is prone to sympathetic combustion and explosion when it catches fire, which is difficult to solve; at the same time, in order to meet the heat dissipation requirements of the batteries and control components in the energy storage cabinet, the heat dissipation device in the energy storage cabinet needs to be turned on 24 hours a day, which consumes a lot of energy. If the energy storage industry wants to achieve long-term development, it is imperative to improve the requirements of energy storage battery systems in terms of safety, energy saving, and efficiency.

[0003] Based on the above requirements, a distributed, modular string energy storage system becomes the best solution to solve the above problems. The distributed, modular solution is actually to split the "system" into independent "modules", replacing the large energy storage battery cabinet with a small discrete outdoor battery box, which is equipped with independent heat dissipation, fire protection, and energy management units, and then forms a large-capacity string energy storage system through parallel connection, that is, a string energy storage system.

[0004] In the string energy storage system mode, if a single battery box has a problem, other battery boxes are completely unaffected and can continue to work, which can fully realize the functions of one box one monitoring, one box one management, and distributed heat dissipation, which can greatly improve the safety of the entire system and the battery life, and effectively avoid the "short board effect" caused by factors such as battery module capacity loss and poor cell consistency, thereby meeting the demand for longer constant power output. This control method can realize flexible battery module input and output control, automatic maintenance of the plug-in box, and improve the comprehensive utilization efficiency of the string energy storage system.

[0005] However, the current string energy storage technology still has the following problems:

[0006] 1. Centralized water cooling and PCS become single cluster single water cooling and single control, which requires multiple water chillers and PCS, increasing costs;

[0007] 2. Low integration. Each cluster requires independent water cooling, high-voltage box, PCS, EMS, and BMS, involving many materials, complex control logic, large space requirements, and low energy density.

[0008] 3. The string energy storage system on the market has not yet broken away from the architecture of the traditional centralized string energy storage system. It still uses a frame box structure, or even a string system, and a centralized water cooling mode, which is not convenient for capacity expansion and fails to give full play to the flexible characteristics of the string energy storage system. Utility Model Content

[0009] The utility model provides a control box body of a string type energy storage system and a string type energy storage system, which are used to solve the defects of the existing string type energy storage system, such as low space utilization, distributed arrangement of electrical components, high cost, great difficulty in transportation, inability to achieve rapid installation, great difficulty in maintenance and long maintenance period when a fault occurs.

[0010] According to a control box of a string energy storage system provided in the first aspect of the utility model, the control box is electrically connected to a battery module; the control box comprises: a box shell, an open accommodating space is formed inside; an integrated tray is arranged in the accommodating space and used for installing electrical components, and the integrated tray can move relative to the length direction of the box shell; a box door is arranged at the opening of the accommodating space; wherein the electrical components at least include: an integrated control unit, which is respectively connected to the battery module and an external power grid.

[0011] According to one embodiment of the utility model, the integrated control unit includes: a PCS unit, which is an energy conversion unit of the battery module, used to regulate the conversion between AC and DC; an EMS unit, which is a management unit of the battery module, used to manage the operation of the battery module; and a BMS unit, which is a control unit of the battery module, used to control the charging and discharging of the battery module.

[0012] Specifically, this embodiment provides an implementation of an integrated control unit.

[0013] According to an embodiment of the utility model, the box door is rotatably arranged on the open side of the accommodating space;

[0014] Alternatively, the box door is detachably arranged on the open side of the accommodating space.

[0015] Specifically, this embodiment provides an implementation of a cabinet door.

[0016] According to a second aspect of the present invention, a battery cluster is provided, comprising a control box and at least one battery module, wherein the battery cluster comprises at least one battery sub-cluster; wherein the control box is the control box of the above-mentioned string energy storage system.

[0017] According to an embodiment of the present utility model, the control box is arranged at the bottom of the string-type energy storage system to support the battery module.

[0018] Specifically, this embodiment provides an implementation method for controlling the setting position of the box.

[0019] According to a third aspect of the present invention, a string-type energy storage system is provided, comprising a plurality of the above-mentioned battery clusters; the battery modules of the battery clusters and the control box are stacked.

[0020] According to an embodiment of the present invention, a plurality of the battery clusters are arranged in parallel, and any two of the battery clusters are connected via an electrical connector, wherein the battery cluster includes at least one battery sub-cluster.

[0021] Specifically, this embodiment provides an implementation of a battery cluster.

[0022] According to one embodiment of the utility model, it also includes: a thermal management module, which is respectively connected to the control box and the battery module through a circulation pipeline, and is used to provide cooling and / or heat to the control box and the battery module; wherein the thermal management module, the battery module and the control box are stacked.

[0023] Specifically, this embodiment provides an implementation of a thermal management module.

[0024] According to one embodiment of the utility model, the thermal management module, the battery module and the control box are stacked to form a battery cluster, a plurality of the battery clusters are arranged in parallel, and the thermal management module of each battery cluster operates independently, wherein the battery cluster includes at least one battery sub-cluster.

[0025] Specifically, this embodiment provides another implementation of a battery cluster.

[0026] According to one embodiment of the utility model, the thermal management module includes: a module housing and a power unit; the power unit is arranged in the module housing; the circulation pipeline is connected to the power unit, and the circulation pipeline forms a loop between the control box and the battery module, which is used to provide cooling and / or heat to the control box and the battery module.

[0027] Specifically, this embodiment provides an implementation of a module housing and a power unit.

[0028] The above one or more technical solutions in the present invention have at least one of the following technical effects: the control box, battery cluster and string energy storage system of a string energy storage system provided by the present invention adopt an integrated setting, and all electrical components are installed on an integrated tray. The integrated tray adopts a pull-out structure, which improves space utilization and energy density, reduces costs, and is convenient for later maintenance and inspection, or the entire integrated tray can be pulled out for replacement in case of failure, which is also convenient for production organization, and even enables customers to assemble modules on site, meeting the needs of string energy storage systems with single-row single-cluster or single-row multi-cluster battery arrangements.

[0029] Furthermore, all electrical components are integrated and installed on an integrated tray, and single-cluster charging and discharging, battery temperature management, energy conversion, and convergence control are realized. They are connected to an external power grid through cables at the bottom to realize internal charging or external discharging. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the assembly relationship of the control box of the string type energy storage system provided by the utility model;

[0032] Figure 2 It is a schematic diagram of the arrangement relationship of the control box of the string type energy storage system provided by the utility model;

[0033] Figure 3 This is one of the schematic diagrams of the assembly relationship between the thermal management module, the control box and the battery module in the string energy storage system provided by the utility model;

[0034] Figure 4 This is the second schematic diagram of the assembly relationship between the thermal management module, the control box and the battery module in the string energy storage system provided by the utility model;

[0035] Figure 5 This is the third schematic diagram of the assembly relationship between the thermal management module, the control box and the battery module in the string energy storage system provided by the utility model;

[0036] Figure 6 This is the fourth schematic diagram of the assembly relationship between the thermal management module, the control box and the battery module in the string energy storage system provided by the utility model;

[0037] Figure 7 This is the fifth schematic diagram of the assembly relationship between the thermal management module, the control box and the battery module in the string energy storage system provided by the utility model;

[0038] Figure 8 It is a schematic diagram of the assembly relationship of the string type energy storage system provided by the utility model;

[0039] Fig. 9 It is a logic diagram of a control module of a string energy storage system provided by the utility model;

[0040] Fig.10 This is a schematic diagram of the arrangement of a single column and double clusters in the string energy storage system provided by the utility model;

[0041] Fig.11 It is a schematic diagram of external wiring of a single-row double-cluster string energy storage system in the string energy storage system provided by the utility model.

[0042] Reference numerals:

[0043] 10. Thermal management module; 11. Circulation pipeline; 12. Module housing; 13. Power unit;

[0044] 20. Control box; 21. Integrated control unit; 211. PCS unit; 212. EMS unit; 213. BMS unit; 22. Box shell; 23. Box door; 24. Integrated tray;

[0045] 30. Battery module;

[0046] 40. Connecting screw;

[0047] 50. Electrical connectors;

[0048] 60. Control signal line;

[0049] 70. Thermal insulation layer;

[0050] 100. Battery cluster. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0052] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0053] The present invention will be described in detail below in conjunction with specific implementation methods.

[0054] In some specific embodiments of the present invention, Figure 1 and Figure 2 As shown, the utility model provides a control box of a string energy storage system, wherein the control box 20 is electrically connected to a battery module 30; the control box 20 comprises: a box shell 22, inside which is formed a storage space with a side opening; an integrated tray 24, arranged in the storage space, for installing electrical components 21, and the integrated tray 24 can move in the length direction relative to the box shell 22; a box door 23, arranged at the opening of the storage space; wherein the electrical component 21 comprises at least: an integrated control unit, respectively connected to the battery module 30 and the external power grid.

[0055] It is understandable that the battery module 30 can be provided in one or more numbers, such as 5, 8 or other numbers within a reasonable range.

[0056] It should be noted that the control box 20 is composed of a box shell 22, a box door 23 and an integrated tray 24. The control box 20 is mainly a supporting structure of the entire string energy storage system. There are 4 to 6 threaded holes arranged around it for connecting with the battery module 30. The connecting screw 40 passes through the thermal management module 10, and the battery module 30 is connected to the threaded hole of the box shell 22. The control box 20 also plays the role of protecting the integrated tray 24. All electrical components are installed on the integrated tray 24. The integrated tray 24 adopts a retractable structure, which is convenient for later maintenance, inspection and replacement. The box door 23 protects the electrical components 21 of the integrated tray 24 from rain and dust when the system is working normally and avoids electrical damage. It can be opened for operation when maintenance and inspection are required.

[0057] In some possible embodiments of the utility model, the integrated control unit includes: a PCS unit 211, which is an energy conversion unit of the battery module 30, used to regulate the conversion between AC and DC; an EMS unit 212, which is a management unit of the battery module 30, used to manage the operation of the battery module 30; and a BMS unit 213, which is a control unit of the battery module 30, used to control the charging and discharging of the battery module 30.

[0058] Specifically, this embodiment provides an implementation of an integrated control unit.

[0059] It should be noted that the electrical component 21 includes a PCS unit 211, an EMS unit 212 and a BMS unit 213. The PCS unit 211 is an energy conversion unit of the battery module 30, which is used to adjust the conversion between AC and DC; the EMS unit 212 is a management unit of the battery module 30, which is used to manage the operation of the battery module 30; the BMS unit 213 is a control unit of the battery module 30, which is used to control the charging and discharging of the battery module 30; the integrated design of the PCS unit 211, the EMS unit 212 and the BMS unit 213 has the advantage of lower overall procurement cost; the energy density is high, and no additional space for the high-voltage box 211 or other systems is required, the space utilization rate is high, the energy density is high, and the footprint is small.

[0060] Furthermore, according to the structural layout requirements, the PCS unit 211, the BMS unit 213 and the EMS unit 212 are all integrated into a box shell 22 to form an integrated module of control, energy conversion and battery management, thereby improving space utilization and energy density, simplifying control logic and reducing costs.

[0061] It should be noted that PCS is a power storage inverter, the full spelling of which is Power Conversion System. It is a device used to control the charging and discharging process of the battery, and it can realize the conversion of AC and DC power.

[0062] EMS is the abbreviation of Energy Management System. The energy storage management system can monitor and manage energy storage equipment in real time, including battery packs, supercapacitors, etc., to ensure their normal operation and performance.

[0063] BMS is the abbreviation of Battery Management System. Energy storage BMS refers to the subsystem used to manage battery string energy storage systems, including battery charging, discharging, temperature, voltage and other parameter monitoring, SOC (Stat of Charge), SOH (State of Health) estimation and protection measures.

[0064] In an application scenario, such as Figure 1 As shown, the control box 20 is composed of electrical components 21, a box shell 22, a box door 23 and an integrated tray 24.

[0065] The box shell 22 is mainly the supporting frame of the entire module or the entire string energy storage system. There are 4 to 6 threaded holes arranged around it for connecting with other modules. The box shell 22 also plays the role of protecting the electrical components 21. All electrical components 21 are installed on a pull-out tray, namely the integrated tray 24. The integrated tray 24 has good independence and interchangeability, which is convenient for later pull-out maintenance and inspection as well as replacement of the entire control box 20. The box door 23 protects the electrical components 21 on the integrated tray 24 from the entry of rain and dust and avoids electrical damage when the system is working normally, and can be opened for operation when maintenance and inspection are required.

[0066] The control box 20 is a design that integrates the PCS unit 211, the EMS unit 212 and the BMS unit 213 into one module according to the requirements of the structural modular layout. All electrical components 21 are installed on an integrated tray 24, which is arranged in sequence from the DC side into a DC circuit, a power unit, a filter unit, an integrated control unit and an AC circuit.

[0067] The DC circuit is a component that connects the battery cluster 100 and the power unit, and is composed of electrical components such as fuses, DC contactors, and inductors, and plays a connecting and protective role.

[0068] The power unit is mainly composed of capacitors, transistors, heat sinks and other components. Its main function is DC / AC conversion and energy conversion, that is, in the charging process, the AC power of the power grid is converted into DC power to charge the battery. When discharging, the DC power of the battery is converted into AC power, and discharged to the power grid or load through LCL filtering and subsequent AC circuits. The LCL filter unit mainly plays a filtering role, so that the power unit and the subsequent battery power remain stable during charging, or when discharging, the load or power grid is discharged stably.

[0069] The integrated control unit is a highly integrated EMS, PCS, and BMS. The integrated controller adopts a multi-core control chip to realize the functions of EMS, PCS, and BMS respectively, thereby realizing the centralized control of the entire string energy storage system, avoiding the situation in which EMS, PCS, and BMS are controlled separately in the existing technology. Chip-level IPC and other communications can be used between the three.

[0070] The AC circuit is the component that connects the LCL filter unit and the power grid. It includes circuit breakers, AC contactors, capacitors and other components, and plays a connecting and protective role.

[0071] Through the integrated design of the above-mentioned multiple functional components, a multifunctional energy storage control module is formed, so that the entire energy storage control module can realize the charging and discharging, battery temperature management, energy conversion, and convergence control of the string energy storage system, and connect with the external power grid through the bottom cable to realize internal charging or external discharging.

[0072] In a possible embodiment, the energy conversion logic of the utility model is as follows: during charging, AC power enters from the bottom of the cabinet, passes through the AC circuit, LCL filtering, and power unit inversion, and is connected to the battery cluster 100 through the DC circuit. During reverse discharge, the load is supplied through power unit inversion, LCL filtering, and AC circuit.

[0073] In some possible implementations of the present invention, the box door 23 is rotatably disposed at the opening of the accommodating space.

[0074] Specifically, this embodiment provides an implementation of a box door 23 , and the rotation setting of the box door 23 facilitates opening and closing the accommodating space through the box door 23 .

[0075] In some possible implementations of the present invention, the box door 23 is detachably disposed at the opening of the accommodating space.

[0076] Specifically, this embodiment provides another implementation of the cabinet door 23, in which the cabinet door 23 is set to be detachable, so that when the cabinet door 23 needs to be removed as a whole or it hinders installation, maintenance and disassembly, the cabinet door 23 can be removed as a whole, thereby improving work efficiency.

[0077] In some specific embodiments of the present invention, the present invention provides a battery cluster including a control box 20 and at least one battery module 30, and the battery cluster 100 includes at least one battery sub-cluster; wherein the control box 20 is the control box of the above-mentioned string energy storage system.

[0078] In some possible implementations of the present invention, the control box 20 is disposed at the bottom of the string energy storage system to support the battery module 30 .

[0079] Specifically, this embodiment provides an implementation method for controlling the location of the control box 20 , where the control box 20 is disposed at the bottom of the battery module 30 to facilitate supporting the battery module 30 .

[0080] In some specific embodiments of the present invention, Figures 1 to 11 As shown, the utility model provides a string-type energy storage system, comprising a plurality of the above-mentioned battery clusters 100; the battery modules 30 and the control box 20 of the battery cluster 100 are stacked.

[0081] It should be noted that the battery cluster 100 of the present invention has better longitudinal boost capability and flexible energy combination through modular stacking setting and single-cluster single control. When different battery cells are used and there is a boost requirement, a reasonable number of stacking layers of battery modules 30 can be selected to achieve different voltage requirements. The layout is more compact, the space utilization rate is high, the energy density is high, the footprint is small, and it is not restricted by the site, cooling equipment, and pipeline layout.

[0082] Furthermore, the utility model realizes a flexible modular combination by configuring the battery cluster 100 as a modular thermal management module 10, a control box 20 and a battery module 30, and a single cluster with a single control and independent cooling, so that each battery cluster 100 is highly independent, and the battery clusters 100 are connected by electrical connectors 50, with a simple structural logic, easy to organize production, and with better longitudinal boost and lateral energy scalability, and the customer can assemble the modules on site.

[0083] Furthermore, the modular design allows for good interchangeability between modules, easy maintenance, and moderate module size, making transfer, lifting, and transportation more convenient.

[0084] Furthermore, the utility model can monitor the status of the battery in real time in the background, promptly warn and replace the faulty battery module 30, and can achieve whole cluster replacement or single module replacement during maintenance. Accessories can be prepared in advance, and on-site replacement can reduce later maintenance costs and shorten the maintenance cycle.

[0085] In some possible implementations of the present invention, the battery modules 30 and the control box 20 are stacked to form a battery cluster 100 . The battery clusters 100 are arranged in parallel, and any two battery clusters 100 are electrically connected. The battery cluster 100 includes at least one battery sub-cluster.

[0086] Specifically, this embodiment provides an implementation method of a battery cluster 100. The utility model directly adopts direct stacking in structure, has no large box structure, removes the traditional frame box structure, is free from the limitations of the traditional frame structure, adopts direct stacking of modules, has lower cost, does not have limited shell space for installation operations, and is more convenient to assemble. The stacked battery cluster 100 can be vertically boosted and horizontally expanded rapidly as needed.

[0087] It should be noted that the battery cluster 100 includes at least one battery sub-cluster, that is, each battery cluster 100 includes multiple arrangements such as a single-row single cluster, a single-row double clusters, and a single-row multiple clusters.

[0088] In some possible implementations of the utility model, it also includes: a thermal management module 10, which is respectively connected to the control box 20 and the battery module 30 through a circulation pipeline 11, and is used to provide cooling and / or heating to the control box 20 and the battery module 30; wherein the thermal management module 10, the battery module 30 and the control box 20 are stacked.

[0089] Specifically, this embodiment provides an implementation method of a thermal management module 10. The battery cluster 100 of the utility model has better longitudinal boost capability and flexible energy combination through modular stacking setting, single cluster single control and independent cooling. When different battery cells are used and there is a boost requirement, a reasonable number of stacking layers of battery modules 30 can be selected to achieve different voltage requirements. The layout is more compact, the space utilization rate is high, the energy density is high, the footprint is small, and it is not restricted by the site, cooling equipment, and pipeline layout.

[0090] It should be noted that the existing string energy storage systems are not operated independently. When increasing the capacity, the system needs to be suspended and redesigned. The connection of subsystems will cause the total voltage difference between the battery groups, which will damage the high-voltage devices. The current mainstream technology is centralized energy storage technology, which connects the DC of the battery cluster 100 in parallel and then converts the DC into AC through the energy storage inverter. This method is simple to control, but when the voltage between the battery clusters 100 is inconsistent, it may cause circulation problems.

[0091] Furthermore, the cluster-controlled energy storage technology adopted by the present invention converts DC power into AC power through multiple smaller capacity converters after converging. The present invention has the advantage that the failure of a single converter will not affect the entire system; cluster-controlled energy storage technology is an important technology for realizing the application of large-scale string energy storage systems. Unlike centralized energy storage, it adopts cluster control and cluster management methods, which can effectively avoid the "short board effect" caused by capacity mismatch and uneven consistency of the battery module 30, thereby providing a longer constant power output. Cluster-controlled energy storage technology can realize flexible input and output control of the battery module 30, automatic maintenance of the plug-in box, and can improve the overall efficiency of the string energy storage system.

[0092] It can be understood that the present invention solves the problem of centralized water cooling and increased costs in existing cluster-controlled energy storage technologies by using single-cluster single-control and independent cooling for each cluster.

[0093] In addition, the utility model adopts direct stacking in structure, has no large box structure, removes the traditional frame box structure, is free from the limitations of the traditional frame structure, adopts direct stacking of modules, has lower cost, does not have limited shell space for installation operations, and is more convenient to assemble. The stacked battery cluster 100 can be rapidly expanded horizontally as needed.

[0094] It should also be noted that the cluster-controlled energy storage technology of the utility model has the advantage of high reliability. It adopts a distributed architecture and single-box single-module fire isolation to achieve cabin-level partitioning and cabin-level pressure relief and explosion relief. A single cluster failure or a single battery module 30 failure will not affect the overall operation, and the system is more reliable.

[0095] In addition, the thermal management module 10, the battery module 30, and the control box 20 each have good consistency and interchangeability. When a single module fails, it can be quickly disassembled and replaced, single-box repaired, or replaced, or the entire cluster can be replaced. After-sales maintenance is convenient, and background monitoring can be achieved, fault warnings can be performed, fault locations or modules can be analyzed, accessories can be prepared in advance, and maintenance cycles can be shortened.

[0096] In some possible embodiments of the present invention, the thermal management module 10, the battery module 30 and the control box 20 are stacked to form a battery cluster 100, the battery clusters 100 are arranged in parallel, and the thermal management module 10 of each battery cluster 100 operates independently, wherein the battery cluster 100 includes at least one battery sub-cluster.

[0097] Specifically, this embodiment provides another implementation method of the battery cluster 100. The utility model solves the problem of centralized water cooling in the existing cluster-controlled energy storage technology, which leads to increased costs, by single-cluster single control and independent cooling of each cluster. In addition, the utility model directly adopts direct stacking in structure, without a large box structure, removing the traditional frame box structure, without the limitations of the traditional frame structure, and adopts direct stacking of modules, which is more cost-effective, does not require installation operations in a limited shell space, and is more convenient to assemble. The stacked battery cluster 100 can be vertically boosted and horizontally rapidly expanded as needed.

[0098] It should be noted that the battery cluster 100 includes at least one battery sub-cluster, that is, each battery cluster 100 includes multiple arrangements such as a single-row single cluster, a single-row double clusters, and a single-row multiple clusters.

[0099] In some possible embodiments of the utility model, the thermal management module 10 includes: a module housing 12 and a power unit 13; the power unit 13 is arranged in the module housing 12; the circulation pipeline 11 is connected to the power unit 13, and the circulation pipeline 11 forms a loop between the control box 20 and the battery module 30, which is used to provide cooling and / or heat to the control box 20 and the battery module 30.

[0100] Specifically, this embodiment provides an implementation of a module housing 12 and a power unit 13. The setting of the module housing 12 provides an installation space for the power unit 13. The power unit 13 transfers cold and / or heat to the battery module 30 and the control box 20 through the circulation pipeline 11, thereby cooling the battery module 30 and the control box 20.

[0101] Furthermore, the refrigerant circuit forms a loop between the control box 20 and the battery module 30, thereby achieving uniform distribution of cold and / or heat, reducing system energy loss, improving cooling efficiency, and simplifying the cooling control circuit.

[0102] In a possible embodiment, the thermal management module 10 provided by the present invention is a liquid cooling module, and the refrigerant is respectively transported to the battery module 30 and the control box 20 through a refrigerant circuit for heat exchange.

[0103] In a possible embodiment, the thermal management module 10 provided by the present invention is an air-cooled module, and the low-temperature airflow is respectively delivered to the battery module 30 and the control box 20 through a refrigerant circuit for heat exchange.

[0104] In a possible embodiment, the thermal management module 10 provided by the present invention is further provided with a heater, which heats the refrigerant, and the heated refrigerant provides heat to the battery module 30 and the control box 20 through the refrigerant circuit.

[0105] In some possible implementations of the present invention, each battery cluster 100 further includes: a connecting screw 40 passing through the thermal management module 10 , the control box 20 and the battery module 30 respectively, for achieving connection between the thermal management module 10 , the control box 20 and the battery module 30 .

[0106] Specifically, this embodiment provides an implementation method of a connecting screw 40. By setting the connecting screw 40, the thermal management module 10, the control box 20 and the battery module 30 in a single cluster are connected, which is convenient for transportation, installation and disassembly. It can be modularly and flexibly combined, has strong scalability, and can quickly increase the voltage vertically and expand the capacity horizontally.

[0107] It should be noted that the purely modular design of the utility model has the advantages of good module interchangeability, convenient maintenance, moderate module size, and more convenient transfer, lifting, and transportation.

[0108] Furthermore, when a fault occurs, a single cluster or a single module can be replaced as a whole and spare parts can be prepared, and the after-sales fault handling cycle is short.

[0109] In some possible implementations of the present invention, each battery cluster 100 further includes: electrical connectors 50 , which pass through the battery modules 30 and are connected to the control box 20 .

[0110] Specifically, this embodiment provides an implementation of an electrical connector 50 . By providing the electrical connector 50 , the battery modules 30 in a single cluster are connected and connected to the control box 20 , thereby achieving the voltage superposition and convergence between the battery modules 30 .

[0111] In an application scenario, such as Figure 5 and Figure 6 As shown, on the basis of the control box 20, the utility model also discloses a single-row dual-cluster string energy storage system, which includes the above-mentioned control box 20, thermal management module 10, upper battery cluster, lower battery cluster, control signal line 60, and electrical connector 50. Each part directly adopts the stacking method of standard box modules, and adopts reasonable fixing measures to form an independent string energy storage system. The functions of each component are as follows:

[0112] The electrical connector 50 connects the battery modules 30 in series and in parallel with each other, and connects each battery module 30 to the control box 20 , so as to achieve voltage superposition and current convergence between the battery modules 30 .

[0113] The control signal line 60 transmits the control signal of each module to the integrated tray 24 of the base, and controls the operation of each branch and each component in an orderly manner, and then transmits it to the background for monitoring and management. The upper battery cluster and the lower battery cluster are composed of a standardized box (containing battery modules and corresponding battery connection components) and a battery side cover plate, wherein the battery modules 30 can be installed interchangeably, and only a reasonable number of layers are stacked according to the power requirements. The battery modules 30 and the battery modules 30 are directly sealed with reasonable measures, and the battery modules 30 and the battery modules 30 are isolated from each other by the bottom plate. The single-row double-cluster layout can realize the thermal management of two battery clusters with one water cooler, thereby effectively avoiding the problem of high comprehensive cost of a single-cluster single-cold water cooler.

[0114] The thermal management module 10 is composed of a circulation pipeline 11, a module shell 12 and a power unit 13. The battery module 30 and the thermal management module 10 are isolated from each other by the cover of the battery module 30. The main function of the thermal management module 10 is to cool the battery module 30, the power unit, and the LCL filter unit system, so that the battery and PCS share a water cooler, and the control strategy is used to achieve uniform distribution of cooling capacity between the battery and PCS, reduce system energy loss, improve cooling efficiency, and simplify the cooling control loop.

[0115] In some possible implementations of the present invention, each battery cluster 100 further includes: a control signal line 60 , which passes through the thermal management module 10 and the battery module 30 respectively, and is connected to the control box 20 .

[0116] Specifically, this embodiment provides an implementation method of a control signal line 60, which connects the battery module 30 and the thermal management module 10 to the control box 20 to achieve orderly control of the operation of each branch and each component, and subsequent transmission to the background for monitoring and management.

[0117] In some possible implementations of the present invention, the exterior of the thermal management module 10 , the control box 20 , and the battery module 30 are wrapped with a thermal insulation adhesive layer 70 .

[0118] Specifically, this embodiment provides an implementation method of the thermal insulation glue layer 70. The provision of the thermal insulation glue layer 70 realizes the removal of the traditional container shell, so that the battery cluster 100 of the utility model eliminates the large box structure, and there is no problem of installation and assembly within the limited space of the shell of the traditional centralized string energy storage system. Small modules are assembled, and the module size is moderate, which is more convenient for transfer, lifting and transportation.

[0119] Furthermore, the modules of the utility model are isolated from each other. When a battery has thermal runaway or catches fire, or the base integrated circuit heats up and catches fire, fire protection isolation of a single box and a single module can be achieved, and cabin-level partitioning, cabin-level pressure relief and explosion relief can be achieved, while other modules are not affected in any way.

[0120] In some possible implementations of the present invention, a battery module 30 is disposed between the thermal management module 10 and the control box 20 .

[0121] Specifically, this embodiment provides an implementation method for the setting of a thermal management module 10, a control box 20 and a battery module 30. The thermal management module 10, the control box 20 and the battery module 30 can be flexibly arranged according to needs. While meeting the different needs of users, flexible longitudinal boosting can also be performed according to the different power requirements of customers.

[0122] In some possible implementations of the present invention, battery modules 30 are disposed on two adjacent sides of the thermal management module 10 and / or the control box 20 .

[0123] Specifically, this embodiment provides another implementation method of the thermal management module 10, the control box 20 and the battery module 30. The thermal management module 10, the control box 20 and the battery module 30 can be flexibly arranged according to needs. While meeting the different needs of users, flexible longitudinal boosting can be performed according to the different power requirements of customers.

[0124] In some possible implementations of the present invention, the thermal management module 10 and the control box 20 are disposed adjacent to each other, and the battery module 30 is disposed adjacent to the thermal management module 10 and / or the control box 20 .

[0125] Specifically, this embodiment provides another implementation method of the thermal management module 10, the control box 20 and the battery module 30. The thermal management module 10, the control box 20 and the battery module 30 can be flexibly arranged according to needs. While meeting the different needs of users, they can also perform flexible longitudinal boosting according to the different power requirements of customers.

[0126] In an application scenario, such as Fig. 9 As shown, the utility model integrates the PCS unit 211, the EMS unit 212 and the BMS unit 213 on an integrated tray 24 to form an integrated module of control, energy conversion, battery management and power distribution, improve space utilization and energy density, simplify control logic and reduce costs. When charging, AC power enters from the bottom of the cabinet, and after being converted into DC power by the AC circuit, LCL filtering and power unit, it is connected to the battery cluster 100 by the DC circuit to charge the battery cluster 100. When discharging in reverse, it is converted into DC power by the power unit, LCL filtering and AC circuit to supply power to the load.

[0127] All electrical components 21 are integrated into the integrated tray 24. The integrated tray 24 adopts a removable structure, which is convenient for later maintenance and inspection, or the entire tray can be replaced in case of failure, while the entire battery module 30, thermal management module 10, and control box 20 do not need to be replaced and are not affected. The entire control box 20 can be designed in a standardized manner to achieve the control of various power string energy storage systems.

[0128] In an application scenario, such as Fig.10 and Fig.11 As shown, the single-row dual-cluster string energy storage system disclosed by the utility model adopts a standardized large-capacity PACK, the number of cells is twice that of an ordinary PACK, the internal part is connected in series, and the external part is connected in 4P series to form a cluster, so as to form a single system with two clusters. It can also adopt 1P (single box) or 2P (two boxes), 3P (3 boxes) series connection to meet the energy storage needs of different voltages, and it can also be made into more clusters, that is, a single-row multi-cluster arrangement (appropriately change the base), and the corresponding modular control base adopts a dual-path (or multi-path) circuit, and realizes convergence in the LCL filter unit.

[0129] Furthermore, the utility model integrates the PCS unit 211, the EMS unit 212 and the BMS unit 213 into an integrated tray 24 to form a standard module integrating control, energy conversion, battery management and power distribution, thereby improving space utilization and energy density and reducing costs. The utility model not only integrates the structure but also realizes the fusion of control, realizes the multifunctional synthesis of a component and forms a standardized module with moderate module size, which is more convenient for transfer, lifting and transportation.

[0130] In an application scenario, the single-row dual-cluster string energy storage system disclosed by the utility model adopts a standardized battery box module 30 and a thermal management module 10, and directly adopts direct stacking in structure to form a single-row control with independent water cooling, a highly independent string system. The fire protection isolation of a single box and a single module realizes cabin-level partitioning, cabin-level pressure relief and explosion relief, while other modules are not affected in any way. When a fault occurs, the overall replacement and accessories preparation of a single cluster and a single module can be realized, and the after-sales fault handling cycle is short. The traditional frame box structure is removed, and the cost is lower.

[0131] In an application scenario, the single-row dual-cluster string energy storage system disclosed by the utility model adopts a single-row dual-cluster layout, which can realize thermal management of two clusters of batteries with one water chiller, thereby effectively avoiding the problem of high comprehensive cost of a single-cluster single-cold water chiller. The corresponding modular control box 20 adopts a dual-path circuit and realizes convergence in the LCL filter unit, and finally outputs stable three-phase electricity to the power grid or load. The system has good longitudinal boost and scalability, and the energy combination is flexible. When different battery cells are used and there is a boost requirement, a reasonable number of battery module stacking layers can be selected to achieve different voltage requirements.

[0132] In an application scenario, the utility model can also expand the single-row string energy storage system horizontally according to the different power requirements of customers, and connect the clusters in parallel to meet the customer's requirements for a large-scale string energy storage system.

[0133] The utility model has the following technical effects:

[0134] 1. High integration, achieving multifunctional synthesis and lower cost; no need for additional high-voltage boxes or other system space, high space utilization.

[0135] 2. Standardized module design and pull-out control module tray can be pulled out for maintenance or replacement, making maintenance convenient.

[0136] 3. Share water cooling with the battery module 30. In the case of a single-row dual-cluster configuration, the two clusters are water-cooled together, which has a simple structure, good cooling effect, low cost, and a high electrical protection level of the module.

[0137] 4. Single-box and single-module fire isolation realizes cabin-level partition, cabin-level pressure relief and explosion relief, making the system safer.

[0138] 5. Easy maintenance, pure modular design, good module interchangeability, convenient maintenance, moderate module size, more convenient transfer, lifting and transportation; the whole cluster can be replaced, single module can be replaced, shortening the maintenance cycle.

[0139] 6. The single-row double-cluster string energy storage system of the utility model has no traditional frame structure, and adopts direct stacking of modules, which is more cost-effective, does not require installation and operation within a limited shell space, and is more convenient to assemble.

[0140] 7. The single-row double-cluster string energy storage system of the utility model has high independence, and the two clusters in a single row are water-cooled together, which not only solves the problem of high comprehensive cost of single-cluster single-cooling water chillers in string energy storage systems, but also retains the flexible characteristics of string energy storage systems.

[0141] 8. The single-row dual-cluster string energy storage system of the utility model can be modularly and flexibly combined, has strong scalability, and can be stacked with multiple layers of batteries to increase voltage and capacity, and can be connected in parallel with multiple columns horizontally to increase capacity.

[0142] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0143] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0144] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0145] Finally, it should be noted that the above implementation modes are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not deviate from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A control box of a string energy storage system, wherein the control box (20) is electrically connected to a battery module (30), characterized in that: The control box (20) comprises: A box shell (22) is formed with an open accommodation space inside; An integrated tray (24) is arranged in the accommodating space and is used to install the electrical components (21); the integrated tray (24) can move relative to the length direction of the box shell (22); A box door (23) is arranged at the opening of the accommodation space; Wherein, the electrical component (21) at least comprises: An integrated control unit is connected to the battery module (30) and an external power grid respectively.

2. The control box of the string energy storage system according to claim 1, characterized in that: The integrated control unit comprises: The PCS unit (211) is an energy conversion unit of the battery module (30) and is used to adjust the conversion between AC power and DC power; An EMS unit (212), which is a management unit of the battery module (30) and is used to manage the operation of the battery module (30); The BMS unit (213) is a control unit of the battery module (30) and is used to control the charging and discharging of the battery module (30).

3. The control box of the string energy storage system according to claim 1 or 2, characterized in that: The box door (23) is rotatably arranged at the opening of the accommodation space; Alternatively, the box door (23) is detachably arranged at the opening of the accommodating space.

4. A battery cluster, characterized in that: It comprises a control box (20) and at least one battery module (30), wherein the battery cluster (100) comprises at least one battery sub-cluster; Wherein, the control box (20) is the control box of the string energy storage system as described in any one of claims 1 to 3 above.

5. The battery cluster according to claim 4, characterized in that: The control box (20) is arranged at the bottom of the string-type energy storage system and is used to support the battery module (30).

6. A string energy storage system, characterized in that: It comprises a plurality of battery clusters (100) as claimed in claim 4 or 5; the battery modules (30) of the battery cluster (100) and the control box (20) are stacked.

7. The string energy storage system according to claim 6, characterized in that: A plurality of the battery clusters (100) are arranged in parallel, and any two of the battery clusters (100) are connected via an electrical connector (50).

8. The string energy storage system according to claim 6, characterized in that: Also includes: A thermal management module (10) is connected to the control box (20) and the battery module (30) respectively through a circulation pipeline (11), and is used to provide cooling and / or heating for the control box (20) and the battery module (30); Wherein, the thermal management module (10), the battery module (30) and the control box (20) are stacked.

9. The string energy storage system according to claim 8, characterized in that: The thermal management module (10), the battery module (30) and the control box (20) are stacked to form a battery cluster (100); a plurality of the battery clusters (100) are arranged in parallel, and the thermal management module (10) of each battery cluster (100) operates independently.

10. The string energy storage system according to claim 8 or 9, characterized in that: The thermal management module (10) comprises: a module housing (12) and a power unit (13); The power unit (13) is arranged in the module housing (12); The circulation pipeline (11) is connected to the power unit (13), and the circulation pipeline (11) forms a loop between the control box (20) and the battery module (30), for providing cooling and / or heating to the control box (20) and the battery module (30).

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