Extensible modular string type energy storage system

Abstract

The utility model provides an extensible modularized string type energy storage system, which comprises a plurality of energy storage units arranged side by side, each energy storage unit comprises a heat management module, a control module and a battery module which are stacked; the heat management module is connected with the control module and the battery module through a circulation pipeline and used for providing cold energy and / or heat energy for the control module and the battery module. An electrical element is arranged in the control module and is at least connected with the thermal management module and the battery module; wherein any two energy storage units are connected in parallel, and the heat management module of each energy storage unit operates independently. The energy storage units are arranged to be the modularized heat management modules, the control modules and the battery modules, modularized flexible combination is achieved, single-row single control is achieved, independent cooling is achieved, all the energy storage units are highly independent, the energy storage units are connected through the electrical connecting pieces, structural logic is simple, production and assembly are convenient, and cost is low. And better energy expansibility of longitudinal multi-layer stacking boosting and transverse multi-column parallel connection is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage equipment, and in particular to an expandable modular string energy storage system. Background Art

[0002] Large-scale energy storage technology is a key technology for smart grids, power dispatching, peak-shaving and valley-filling, and peak-shaving and frequency regulation. Lithium-ion batteries have been widely used in many fields due to their advantages such as high energy density, low self-discharge rate, stable discharge voltage, and long cycle life. The application of lithium batteries in large-scale power storage systems will become an inevitable trend in technological development. However, lithium battery technology is not yet mature. Large-scale energy storage systems require thousands of lithium-ion single cells to be connected in series and parallel to form a system. They have high requirements for thermal management or other safety management. Any failure of a single cell will affect the operation of the entire energy storage system. Therefore, how to ensure the safe, reliable, and efficient operation of the energy storage system is a key technology for large-scale energy storage systems.

[0003] Furthermore, existing energy storage systems do not operate independently. When increasing capacity, the system needs to be suspended and redesigned. The connection of subsystems will cause total voltage differences between battery packs, damaging high-voltage devices.

[0004] The current mainstream technology is centralized energy storage technology, which connects multiple energy storage units in parallel and then converts the DC into AC through an energy storage converter. This method is simple to control, but when the voltages between energy storage units are inconsistent, it may cause circulating current problems. Utility Model Content

[0005] The utility model provides an expandable modular string energy storage system to solve at least part of the existing centralized energy storage technology, which uses a plurality of energy storage units to connect in parallel and then convert the DC into AC through an energy storage converter, but has the defect that when the voltages between the energy storage units are inconsistent, circulating current may be caused.

[0006] According to the utility model, an expandable modular string energy storage system is provided, comprising: a plurality of energy storage units arranged side by side; each of the energy storage units comprises a stacked thermal management module, a control module and at least one battery module; the thermal management module is respectively connected to the control module and the battery module through a circulation pipeline, and is used to provide cooling and / or heat to the control module and the battery module; an electrical component is arranged in the control module, and the electrical component is connected to at least the thermal management module and the battery module; wherein any two of the energy storage units are connected in parallel, and the thermal management module of each energy storage unit operates independently.

[0007] According to an embodiment of the utility model, each of the energy storage units further includes: a connecting rod, which passes through the thermal management module, the control module and the battery module respectively, and is used to achieve connection between the thermal management module, the control module and the battery module.

[0008] Specifically, this embodiment provides an implementation of a connecting rod.

[0009] According to an implementation manner of the utility model, each of the energy storage units further includes: an electrical connector for realizing series and parallel connection of the battery modules and connecting to the control module.

[0010] Specifically, this embodiment provides an implementation of an electrical connector.

[0011] According to an implementation manner of the utility model, each of the energy storage units further includes: a control signal line, connecting the thermal management module and the battery module, and connected to the control module.

[0012] Specifically, this embodiment provides an implementation method for controlling a signal line.

[0013] 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 module and the battery module, which is used to provide cooling and / or heat to the control module and the battery module.

[0014] Specifically, this embodiment provides an implementation of a module housing and a power unit.

[0015] According to one embodiment of the utility model, the control module includes: a box shell, a box door and an integrated tray; the box shell is arranged adjacent to the upper and lower layers of the thermal management module and / or the battery module; the box door is movably arranged at both side ends of the box shell; the integrated tray is slidably arranged inside the box shell from the end where the box door is located, and is used to place electrical components.

[0016] Specifically, this embodiment provides an implementation of a cabinet shell, a cabinet door, and an integrated tray.

[0017] According to an embodiment of the present utility model, the exterior of the battery module is wrapped with a thermal insulation adhesive layer.

[0018] Specifically, this embodiment provides an implementation method of a thermal insulation adhesive layer.

[0019] According to an implementation manner of the present utility model, the battery module is arranged between the thermal management module and the control module.

[0020] Specifically, this embodiment provides an implementation method for setting up a thermal management module, a control module and a battery module.

[0021] According to an embodiment of the present utility model, the battery modules are arranged on both sides of the upper and lower layers of the thermal management module and / or the control module.

[0022] Specifically, this embodiment provides another implementation method of the thermal management module, the control module and the battery module.

[0023] According to an embodiment of the present utility model, the thermal management module and the control module are arranged adjacent to each other in upper and lower layers, and the battery module is arranged adjacent to the thermal management module and / or the control module in upper and lower layers.

[0024] Specifically, this embodiment provides another implementation method of the thermal management module, the control module and the battery module.

[0025] The above one or more technical solutions in the present invention have at least one of the following technical effects: the present invention provides an expandable modular string energy storage system, which adopts a cluster-controlled energy storage system. By setting the energy storage unit as a modular thermal management module, control module and battery module, a flexible modular combination is achieved, and a single column and single control with independent cooling is provided, so that each energy storage unit is highly independent. The energy storage units are connected by electrical connectors, the structural logic is simple, and the production and assembly are convenient. It has better energy scalability of vertical multi-layer stacking boost and horizontal multi-column parallel connection, and the customer can assemble the modules on site.

[0026] Furthermore, the modular design allows for good interchangeability between modules, easy maintenance, and moderate module size, making transfer, lifting, and transportation more convenient.

[0027] 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, and can realize the replacement of the entire cluster or single module during maintenance. Accessories can be prepared in advance, and on-site replacement can reduce the later maintenance cost and shorten the maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 This is one of the assembly relationship diagrams of the expandable modular string energy storage system provided by the utility model;

[0030] Figure 2 This is the second schematic diagram of the assembly relationship of the expandable modular string energy storage system provided by the utility model;

[0031] Figure 3 This is one of the schematic diagrams of the assembly relationship of the energy storage units in the expandable modular string energy storage system provided by the utility model;

[0032] Figure 4 This is the second schematic diagram of the assembly relationship of the energy storage unit in the expandable modular string energy storage system provided by the utility model;

[0033] Figure 5 This is the third schematic diagram of the assembly relationship of the energy storage unit in the expandable modular string energy storage system provided by the utility model;

[0034] Figure 6 This is the fourth schematic diagram of the assembly relationship of the energy storage unit in the expandable modular string energy storage system provided by the utility model;

[0035] Figure 7 This is the fifth schematic diagram of the assembly relationship of the energy storage unit in the expandable modular string energy storage system provided by the utility model;

[0036] Figure 8 This is the third schematic diagram of the assembly relationship of the expandable modular string energy storage system provided by the utility model;

[0037] Fig. 9 It is a schematic diagram of the arrangement relationship of electrical components in the expandable modular string energy storage system provided by the utility model;

[0038] Fig.10 This is the second schematic diagram of the assembly relationship of the energy storage unit in the expandable modular string energy storage system provided by the utility model;

[0039] Fig.11 This is the third schematic diagram of the assembly relationship of the energy storage unit in the expandable modular string energy storage system provided by the utility model;

[0040] Fig.12 This is the fourth schematic diagram of the assembly relationship of the energy storage unit in the expandable modular string energy storage system provided by the utility model;

[0041] Fig.13This is the fifth schematic diagram of the assembly relationship of the energy storage units in the expandable modular string type energy storage system provided by the utility model.

[0042] Reference numerals:

[0043] 10. Thermal management module; 11. Circulation pipeline; 12. Module shell; 121. Air outlet; 122. Air inlet; 13. Power unit; 20. Control module; 21. Electrical components; 211. PCS unit; 212. EMS unit; 213. BMS unit; 22. Box shell; 23. Box door; 24. Integrated tray; 30. Battery module; 40. Connecting rod; 50. Electrical connector; 60. Control signal line; 70. Insulation glue layer; 100. Energy storage unit; 110. Electronic control unit; 120. Pump body; 130. Expansion pot; 140. Compressor; 150. Heat exchanger; 160. Condenser; 170. Fan; 180. Connecting rod; 190. Heater. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] The present invention will be described in detail below in conjunction with specific implementation methods.

[0047] In some specific embodiments of the present invention, Figures 1 to 7As shown, the present solution provides an expandable modular string energy storage system, comprising: a plurality of energy storage units 100 arranged side by side; each energy storage unit 100 comprises a stacked thermal management module 10, a control module 20 and at least one battery module 30; the thermal management module 10 is respectively connected to the control module 20 and the battery module 30 through a circulation pipeline 11, and is used to provide cooling and / or heat to the control module 20 and the battery module 30; an electrical component 21 is arranged in the control module 20, and the electrical component 21 is connected to at least the thermal management module 10 and the battery module 30; wherein any two energy storage units 100 are connected in parallel, and the thermal management module 10 of each energy storage unit 100 operates independently.

[0048] Independent operation in the present invention means that each energy storage unit 100 has a complete set of thermal management modules 10 and does not share equipment or pipelines in the thermal management module 10 with other energy storage units 100, so as to improve the flexibility and scalability of the energy storage unit 100 and facilitate the lateral and longitudinal expansion of the energy storage unit 100.

[0049] It should be noted that 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 energy storage systems. Unlike centralized energy storage, it adopts cluster control and cluster management, 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 improve the overall efficiency of the energy storage system.

[0050] Furthermore, the utility model solves the problem of centralized water cooling and increased costs in existing cluster-controlled energy storage technologies by providing single-row single control and independent cooling for each cluster.

[0051] In addition, the energy storage unit 100 of the present invention has better longitudinal boosting capability and flexible energy combination through modular stacking setting, single-row single control and independent cooling. When different battery cells are used and there is a boosting 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.

[0052] 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 the limited shell space for installation operation, and is more convenient to assemble. The stacked energy storage unit 100 can be rapidly expanded horizontally as needed.

[0053] 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, cabin-level pressure relief and explosion relief. A single-row failure or a single battery module 30 failure will not affect the overall operation, and the system is more reliable.

[0054] Furthermore, the thermal management module 10, the battery module 30, and the control module 20 each have good consistency and interchangeability. When a single module fails, it can be quickly disassembled and replaced, repaired or replaced in a single box, 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.

[0055] In some possible implementations of the present invention, each energy storage unit 100 further includes: a connecting rod 40 that passes through the thermal management module 10 , the control module 20 and the battery module 30 respectively, and is used to achieve connection between the thermal management module 10 , the control module 20 and the battery module 30 .

[0056] Specifically, this embodiment provides an implementation method of a connecting rod 40. By setting the connecting rod 40, the thermal management module 10, the control module 20 and the battery module 30 in a single column 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.

[0057] It should be noted that the purely modular design provided by the present invention has the advantages of good module interchangeability, convenient maintenance, moderate module size, and more convenient transfer, lifting, and transportation.

[0058] Furthermore, when a fault occurs, the entire row or module can be replaced and accessories can be prepared, and the after-sales fault handling cycle is short.

[0059] In some possible implementations of the present invention, each energy storage unit 100 further includes: an electrical connector 50 for realizing series and parallel connection of the battery modules 30 and connecting to the control module 20 .

[0060] Specifically, this embodiment provides an implementation of an electrical connector 50 . By setting the electrical connector 50 , the battery modules 30 in a single column are connected in series and parallel, and connected to the control module 20 , thereby achieving the voltage superposition and convergence between the battery modules 30 .

[0061] In some possible implementations of the present invention, each energy storage unit 100 further includes: a control signal line 60 , which connects the thermal management module 10 and the battery module 30 , and is connected to the control module 20 .

[0062] 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 module 20 to achieve orderly control of the operation of each branch and each component, and subsequent transmission to the background for monitoring and management.

[0063] 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 module 20 and the battery module 30, which is used to provide cooling and / or heat to the control module 20 and the battery module 30.

[0064] 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 module 20 through the circulation pipeline 11, thereby cooling the battery module 30 and the control module 20.

[0065] Furthermore, the medium loop forms a loop between the control module 20 and the battery module 30, thereby achieving uniform distribution of cooling and / or heat, reducing system energy loss, improving cooling efficiency, and simplifying the cooling control loop.

[0066] 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 module 20 through a medium loop for heat exchange.

[0067] 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 module 20 through a medium loop for heat exchange.

[0068] 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 module 20 through the medium loop.

[0069] In some possible embodiments of the utility model, the control module 20 includes: a box shell 22, a box door 23 and an integrated tray 24; the box shell 22 is arranged adjacent to the upper and lower layers of the thermal management module 10 and / or the battery module 30; the box door 23 is movably arranged at the two side ends of the box shell 22; the integrated tray 24 is slidably arranged inside the box shell 22 from the end where the box door 23 is located, and is used to place the electrical components 21.

[0070] Specifically, this embodiment provides an implementation of a box shell 22, a box door 23 and an integrated tray 24, and all electrical components 21 are installed on the integrated tray 24. The integrated tray 24 adopts a pull-out structure, which is convenient for later maintenance and inspection, or the entire integrated tray 24 can be pulled out for replacement in case of failure, while the overall battery module 30, water cooling module and control module 20 do not need to be replaced and are not affected.

[0071] In a possible embodiment, the control module 20 is composed of a box shell 22, a box door 23 and an integrated tray 24. The control module 20 is mainly a supporting structure of the entire energy storage system, with 4 to 6 threaded holes arranged around it for connecting with the battery module 30. The connecting rod 40 passes through the thermal management module 10, and the battery module 30 is connected to the threaded holes of the box shell 22. The control module 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.

[0072] Furthermore, all electrical components 21 are integrated and installed on the integrated tray 24, and realize single-row charging and discharging, battery temperature management, energy conversion, and convergence control, and are connected to the external power grid through cables at the bottom to realize internal charging or external discharging.

[0073] In a possible embodiment, the electrical component 21 includes a PCS unit, an EMS unit, a BMS unit and a high-voltage box. The PCS unit is an energy conversion unit of the battery module 30, used to adjust the conversion between AC and DC; the EMS unit is a management unit of the battery module 30, used to manage the operation of the battery module 30; the BMS unit is a control unit of the battery module 30, used to control the charging and discharging of the battery module 30; the integrated design of the PCS unit, the EMS unit, the BMS unit and the high-voltage box has the advantage of lower overall procurement cost; high energy density, no additional space for high-voltage boxes or other systems is required, high space utilization, high energy density, and small footprint.

[0074] Furthermore, according to the structural layout requirements, the PCS unit, BMS unit, EMS unit and high-voltage box 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.

[0075] 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.

[0076] 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.

[0077] BMS is the abbreviation of Battery Management System. Energy storage BMS refers to the subsystem used to manage the battery energy storage system, including battery charging, discharging, temperature, voltage and other parameter monitoring, SOC (Stat of Charge), SOH (State of Health) estimation and protection measures.

[0078] In a possible embodiment, the energy conversion logic of the utility model is as follows: when charging, the 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 energy storage unit 100 by the DC circuit. When discharging in the reverse direction, the load is supplied by the power unit inversion, LCL filtering, and AC circuit.

[0079] In some possible implementations of the present invention, the exterior of the battery module 30 is wrapped with a thermal insulation adhesive layer 70 .

[0080] 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 energy storage unit 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 energy storage system. Small modules are assembled, and the module size is moderate, which makes transfer, lifting and transportation more convenient.

[0081] Furthermore, the modules of the utility model are isolated from each other. When a battery experiences thermal runaway or catches fire, or the integrated circuit of the base 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 without any impact on other modules.

[0082] In some possible implementations of the present invention, a battery module 30 is disposed between the thermal management module 10 and the control module 20 .

[0083] Specifically, this embodiment provides an implementation method for the setting of a thermal management module 10, a control module 20 and a battery module 30. The thermal management module 10, the control module 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.

[0084] In some possible implementations of the present invention, battery modules 30 are disposed on both sides of the upper and lower adjacent layers of the thermal management module 10 and / or the control module 20 .

[0085] Specifically, this embodiment provides another implementation method of the setting of the thermal management module 10, the control module 20 and the battery module 30. The thermal management module 10, the control module 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.

[0086] In some possible implementations of the present invention, the thermal management module 10 and the control module 20 are disposed adjacent to each other in upper and lower layers, and the battery module 30 is disposed adjacent to the thermal management module 10 and / or the control module 20 in upper and lower layers.

[0087] Specifically, this embodiment provides another implementation method of the setting of the thermal management module 10, the control module 20 and the battery module 30. The thermal management module 10, the control module 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.

[0088] 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.

[0089] Specifically, this embodiment provides an implementation of an integrated control unit.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] In an application scenario, such as Figure 8 As shown, the control module 20 is composed of electrical components 21 , a box shell 22 , a box door 23 and an integrated tray 24 .

[0096] 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 module 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.

[0097] The control module 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] In some possible implementations of the present invention, the box door 23 is rotatably disposed at the opening of the accommodating space.

[0105] 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 .

[0106] In some specific embodiments of the present invention, Figures 10 to 13 As shown, the present solution provides a thermal management module for a battery cluster, comprising: a shell 10, a circulation part, a heat exchange part and an electronic control part 110, wherein the shell 10 and at least one battery module 30 are stacked to form a battery cluster 100, and the outer shape of the shell 10 is the same as the outer shape of the battery module 30; the circulation part is arranged in the shell 10, and is connected to the battery module 30 through a circulation pipeline 11 to form a circulation loop of the medium; the heat exchange part is arranged in the shell 10, and is thermally coupled with the circulation part, and is used to exchange heat or cold with the medium; the electronic control part 110 is arranged in the shell 10, and is respectively connected to the circulation part and the heat exchange part.

[0107] It can be understood that the stacking direction can be horizontal, vertical, or other stacking directions that can be obtained without creative work by those skilled in the art, and vertical stacking is preferred.

[0108] It should be noted that the utility model provides an integrated thermal management module, which can adapt to battery clusters 100 with different capacities to ensure the versatility of the thermal management system. At the same time, the thermal management module is connected to the battery module 30 through a connecting rod 40, etc., and the outer shape of the shell 10 is the same as that of the battery module 30, thereby improving the integration of the entire system.

[0109] Furthermore, the key thermal management components inside the thermal management module can be replaced and upgraded individually, and the upgraded thermal management system has a consistent appearance, which improves the uniformity of the appearance of the entire battery cluster 100 and the consistency of the thermal management system, making the thermal management system have the advantage of high component reusability.

[0110] In some possible embodiments of the utility model, the circulation part includes: a pump body 120 and an expansion pot 130. The pump body 120 is connected to the battery module 30 through the circulation pipeline 11, and is used to transport the medium to the corresponding battery module 30; the expansion pot 130 is arranged in parallel with the circulation loop, and is used to replenish the medium into the circulation loop and discharge the gas in the circulation pipeline 11.

[0111] Specifically, this embodiment provides an implementation of a pump body 120 and an expansion pot 130 . By setting the pump body 120 , the medium is transported to the battery module 30 through the circulation pipeline 11 to exchange heat or cold.

[0112] It can be understood that the medium can be water, air or any one or more mixtures of any common cooling media in the art.

[0113] Furthermore, the expansion pot 130 is arranged in parallel with the circulation loop. When the medium in the circulation loop is insufficient, the expansion pot 130 can replenish the medium into the circulation loop. When there is gas in the circulation loop, the gas can be discharged into the expansion pot 130.

[0114] In a possible embodiment, two pump bodies 120 may be provided.

[0115] In a possible embodiment, when the temperature of the battery module 30 is high, the medium obtains cold energy through the heat exchange part and transfers the cold energy to the battery module 30 .

[0116] In a possible embodiment, when the temperature of the battery module 30 is low, the medium obtains heat through the heat exchange portion and transfers the heat to the battery module 30 .

[0117] In some possible embodiments of the present invention, the heat exchange unit includes: a compressor 140, a heat exchanger 150, a condenser 160 and a fan 170; the compressor 140, the heat exchanger 150 and the condenser 160 are connected to form a refrigerant circuit; the fan 170 is arranged corresponding to the condenser 160; wherein the heat exchanger 150 is arranged in parallel with the circulation circuit for exchanging heat or cold with the medium.

[0118] Specifically, this embodiment provides an implementation method of a compressor 140, a heat exchanger 150, a condenser 160 and a fan 170. Through the arrangement of the compressor 140, the heat exchanger 150 and the condenser 160, the circulation of the refrigerant to absorb or release heat is realized. The refrigerant that obtains heat or cold exchanges heat with the medium at the heat exchanger 150, thereby transferring the heat or cold to the medium, and then the medium transfers the heat or cold to the battery module 30.

[0119] Furthermore, the fan 170 is provided to cool the condenser 160 to ensure the normal operation of the condenser 160 .

[0120] In some possible embodiments of the utility model, an air outlet 121 and an air inlet 122 are provided on the shell 10, and the air outlet 121 is provided at least corresponding to the condenser 160 and the fan 170, and the air inlet 122 and the air outlet 121 are connected to form a channel for air flow in and out of the shell 10.

[0121] Specifically, this embodiment provides an implementation of the air outlet 121 and the air inlet 122. The arrangement of the air outlet 121 and the air inlet 122 enables the fan 170 to cool the condenser 160 by utilizing the external airflow.

[0122] In a possible embodiment, the areas of the air inlet 122 and the air outlet 121 are adjustable to meet the requirements for different air flow rates.

[0123] In a possible embodiment, the number of air inlets 122 and air outlets 121 can be adjusted to meet the requirements for different air flow rates.

[0124] In some possible implementations of the present invention, the air inlet 122 and the air outlet 121 are disposed on a side surface of the housing 10 that is perpendicular to the stacking direction of the battery cluster 100 .

[0125] Specifically, this embodiment provides an implementation method for the setting positions of the air outlet 121 and the air inlet 122. The change in the specific setting positions of the air outlet 121 and the air inlet 122 makes it possible to stack the thermal management module and the battery module 30 more. The air inlet 122 and the air outlet 121 are set on a side surface perpendicular to the stacking direction of the battery cluster 100, so that the thermal management module can be set on the top of the battery cluster.

[0126] In some possible implementations of the present invention, the air inlet 122 and the air outlet 121 are disposed on a side surface of the housing 10 that is parallel to the stacking direction of the battery cluster 100 .

[0127] Specifically, this embodiment provides another implementation method for the setting positions of the air outlet 121 and the air inlet 122. The change in the specific setting positions of the air outlet 121 and the air inlet 122 makes the stacking of the thermal management module and the battery module 30 more possible. The air inlet 122 and the air outlet 121 are set on the side surface parallel to the stacking direction of the battery cluster 100, so that the thermal management module can be set not only on the top of the battery cluster 100, but also in the middle of the battery cluster 100, that is, the battery modules 30 are arranged on the top and bottom of the thermal management module, which improves the flexibility of the longitudinal arrangement of the battery cluster 100.

[0128] In some possible implementations of the present invention, the air inlet 122 and the air outlet 121 are disposed on two adjacent surfaces of the housing 10 .

[0129] Specifically, this embodiment provides another implementation method for the setting positions of the air outlet 121 and the air inlet 122. The change in the specific setting positions of the air outlet 121 and the air inlet 122 makes the stacking of the thermal management module and the battery module 30 more possible. The air inlet 122 and the air outlet 121 are set on two adjacent surfaces to ensure that the airflow cools the condenser 160, while increasing the stacking arrangement style of the thermal management module and the battery module 30, thereby improving the flexibility of the longitudinal arrangement of the battery cluster 100.

[0130] In some possible implementations of the present invention, an angle is formed between the condenser 160 and the battery module 30, and the angle is between 25° and 60°;

[0131] Alternatively, the condenser 160 and the battery module 30 are arranged vertically;

[0132] The condenser 160 and the fan 170 are arranged in parallel.

[0133] Specifically, this embodiment provides an implementation method for the setting position of the condenser 160, wherein the condenser 160 is set in parallel with the fan 170 and is set in a relative position with the battery module 30, so that the condenser 160 can better contact with the airflow.

[0134] In some possible implementations of the present invention, the present invention further includes: a heater 180 , which is connected in series with the circulation pipeline 11 to heat the medium.

[0135] Specifically, this embodiment provides an implementation of a heater 180 . When the temperature of the battery module 30 is low, the heater 180 heats the medium, and then transfers the heat to the battery module 30 , thereby increasing the temperature of the battery module 30 .

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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. An expandable modular string energy storage system, characterized in that: include: A plurality of energy storage units (100) arranged side by side; Each of the energy storage units (100) comprises a thermal management module (10), a control module (20) and at least one battery module (30) which are stacked; The thermal management module (10) is connected to the control module (20) and the battery module (30) respectively through a circulation pipeline (11), and is used to provide cooling and / or heating for the control module (20) and the battery module (30); An electrical component (21) is disposed in the control module (20), and the electrical component (21) is connected to at least the thermal management module (10) and the battery module (30); Any two of the energy storage units (100) are connected in parallel, and the thermal management module (10) of each energy storage unit (100) operates independently.

2. The scalable modular string energy storage system according to claim 1, 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 module (20) and the battery module (30) for providing cooling and / or heating to the control module (20) and the battery module (30).

3. The scalable modular string energy storage system according to claim 1, characterized in that: The control module (20) comprises: a box shell (22), a box door (23) and an integrated tray (24); The box shell (22) is arranged adjacent to the thermal management module (10) and / or the battery module (30) in upper and lower layers; The box door (23) is movably arranged at both side ends of the box shell (22); The integrated tray (24) is slidably disposed inside the box shell (22) from the end where the box door (23) is located, and is used to place the electrical components (21).

4. The scalable modular string energy storage system according to claim 1, characterized in that: Each of the energy storage units (100) further comprises: The connecting rod (40) passes through the thermal management module (10), the control module (20) and the battery module (30) respectively, and is used to realize the connection between the thermal management module (10), the control module (20) and the battery module (30).

5. The scalable modular string energy storage system according to claim 1, characterized in that: Each of the energy storage units (100) further comprises: The electrical connector (50) is used to realize the series and parallel connection of the battery modules (30) and is connected to the control module (20).

6. The scalable modular string energy storage system according to claim 1, characterized in that: Each of the energy storage units (100) further comprises: A control signal line (60) connects the thermal management module (10) and the battery module (30), and is connected to the control module (20).

7. The scalable modular string energy storage system according to any one of claims 1 to 6, characterized in that: The battery module (30) is wrapped outside with a thermal insulation adhesive layer (70).

8. The scalable modular string energy storage system according to any one of claims 1 to 6, characterized in that: The battery module (30) is arranged between the thermal management module (10) and the control module (20).

9. The scalable modular string energy storage system according to any one of claims 1 to 6, characterized in that: The battery modules (30) are arranged on two adjacent sides of the upper and lower layers of the thermal management module (10) and / or the control module (20).

10. The scalable modular string energy storage system according to any one of claims 1 to 6, characterized in that: The thermal management module (10) and the control module (20) are arranged adjacent to each other in upper and lower layers, and the battery module (30) is arranged adjacent to the thermal management module (10) and / or the control module (20) in upper and lower layers.

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