A containerized energy storage system with a multi-stage sealing structure

Abstract

This utility model discloses a containerized energy storage system with a multi-stage sealed structure, including a prefabricated energy storage compartment, a liquid cooling compartment, and a combiner control compartment. The prefabricated energy storage compartment houses sealed battery compartments, each containing a battery array. Multiple battery cells within these compartments are connected in series and parallel. The liquid cooling compartment contains a liquid cooler to cool the battery cells in each compartment. The combiner control compartment houses a combiner control cabinet for connecting the main circuit of the battery array and auxiliary circuits for alarm, monitoring, and communication, and for controlling the external connections and charging / discharging operation of the battery array. This utility model features a simple structure, low cost, simplified manufacturing process, small footprint, and high safety.

Description

Technical Field

[0001] This utility model belongs to the field of electrochemical energy storage equipment manufacturing, specifically relating to a container energy storage system with a multi-stage sealing structure. Background Technology

[0002] Against the backdrop of my country's energy transition and "dual-carbon" strategy, the proportion of new energy power generation such as photovoltaic and wind power is increasing. However, both wind power and photovoltaic power are characterized by fluctuations and intermittency. To address this situation, containerized energy storage systems have become a development trend. Electrochemical containerized energy storage systems, with their advantages of high controllability, high modularity, high energy density, high conversion efficiency, and convenient installation, have become one of the most promising energy storage technologies in the field of new energy storage. Containerized energy storage systems consist of electrochemical energy storage units installed inside standardized shipping containers. These containers contain battery arrays, battery management systems (BMS), thermal management systems, fire suppression systems, and other control hardware. The battery arrays are currently structured in multiple levels, consisting of cells, modules, battery packs, battery clusters, and battery stacks, and are installed within the battery compartment of the container. As containerized energy storage systems are increasingly used in practice, many problems have gradually emerged, such as complex structure, high cost, complicated manufacturing process, large space occupation, and low safety. Utility Model Content

[0003] To address the aforementioned problems, this utility model proposes a container energy storage system with a multi-stage sealing structure, which can solve the problems mentioned above.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: As in one aspect of this utility model, a container energy storage system with a multi-stage sealing structure is provided, comprising: The prefabricated energy storage compartment serves as the equipment carrier for the containerized energy storage system. It contains a sealed battery compartment, which is a sealed structure and independent of other compartments. The sealed battery compartment is used to house the battery array and is divided into multiple sealed sub-battery compartments. Each sealed sub-battery compartment includes several battery cell groups. The sealed battery compartment provides a uniform sealed environment for all battery cell groups. The battery cell groups in the multiple sealed sub-battery compartments are connected in series and parallel. The liquid cooling chamber is equipped with a liquid cooler. The inlet and outlet pipes of the liquid cooler are connected to each sealed battery compartment to cool the battery cells in each sealed battery compartment. The combiner control compartment houses the combiner control cabinet, which connects the main circuit and alarm, monitoring, and communication auxiliary circuits of the battery array within the sealed battery compartment, and controls the external connections and charging / discharging operation of the battery array within the sealed battery compartment.

[0005] In one embodiment of this utility model, there are a total of 96 sealed sub-battery compartments, and each sealed sub-battery compartment is identical and independently arranged. Eight compartments are arranged in a row in the vertical direction, and a total of 12 clusters are arranged. Each cluster is equipped with a high-voltage box. Inside each sealed battery compartment, there are 4 lithium-ion battery cell groups, and a total of 52 battery cells are connected in series. The rated voltage of the lithium-ion battery cells is 3.2V, and the rated voltage of each cluster is 1331.2V. The 12 clusters are connected in parallel to form the battery array inside the sealed battery compartment.

[0006] In one embodiment of the present invention, a metal partition is provided between two adjacent sealed sub-battery compartments, the partition is filled with refractory material including rock wool, and the interior of the sealed sub-battery compartment is sprayed with a high-temperature resistant coating, thus forming a fireproof partition between adjacent sealed sub-battery compartments.

[0007] As in one embodiment of this utility model, the partition has a built-in inlet pipe and a return pipe for cables and liquid cooling pipes, and the pipes are fixed by non-metallic structural components.

[0008] In one embodiment of the present invention, the bottom of the sealed electronic battery compartment is a liquid cooling plate, and the four battery cell groups are placed on the liquid cooling plate at the bottom of the sealed sub-battery compartment.

[0009] As in one embodiment of the present invention, the sealed sub-battery compartment is provided with a removable front cover plate, and the front cover plate is provided with a sealing structure to seal the sealed sub-battery compartment. The rear of the sealed sub-battery compartment has a structure for fixing the battery cell assembly, which is used to tighten and fix the battery cell assembly.

[0010] As in one embodiment of the present invention, the container energy storage system further includes a fire compartment, which is used to house fire-fighting equipment. The gas supply pipes of the fire-fighting equipment are connected to each sealed sub-battery compartment to provide fire protection for the battery cells in the sealed sub-battery compartment.

[0011] The containerized energy storage system of this utility model also has advantages in maintenance. When maintaining the containerized energy storage system, after removing the front cover, the battery cell assembly can be directly taken out for maintenance without involving the disassembly and assembly of the liquid cooling pipeline; maintenance is convenient.

[0012] The container energy storage system with a multi-stage sealing structure of this invention is simple in structure, low in cost, has a simplified manufacturing process, occupies little space, and is highly safe. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a first schematic diagram of the external structure of a containerized energy storage system with a multi-stage sealing structure; Figure 2 This is a second schematic diagram of the external structure of a containerized energy storage system with a multi-stage sealing structure; Figure 3 This is a first schematic diagram of the composition structure of a prefabricated energy storage cabin with a multi-stage sealing structure; Figure 4 This is a second schematic diagram of the composition structure of a prefabricated energy storage cabin with a multi-stage sealing structure; Figure 5 This is a third schematic diagram of the composition structure of a prefabricated energy storage cabin with a multi-stage sealing structure; Figure 6 This is the fourth schematic diagram of the structure of a prefabricated energy storage cabin with a multi-stage sealing structure. Figure 7 This is the fifth schematic diagram of the composition structure of a prefabricated energy storage cabin with a multi-stage sealing structure; Figure 8 This is the sixth schematic diagram of the composition structure of a prefabricated energy storage cabin with a multi-stage sealing structure; Figure 9 This is the seventh schematic diagram of the composition structure of a prefabricated energy storage cabin with a multi-stage sealing structure. Figure 10 This is a first schematic diagram of the installation process for a containerized energy storage system with a multi-stage sealing structure. Figure 11 This is a second schematic diagram illustrating the installation process of a containerized energy storage system with a multi-stage sealing structure. Figure 12 This is the third schematic diagram of the installation process for a containerized energy storage system with a multi-stage sealing structure. Figure 13 This is the fourth schematic diagram of the installation process for a containerized energy storage system with a multi-stage sealing structure. Figure 14 This is the fifth schematic diagram of the installation process for a containerized energy storage system with a multi-stage sealing structure. Figure 15 This is the sixth schematic diagram of the installation process for a containerized energy storage system with a multi-stage sealing structure. Figure 16 This is the seventh schematic diagram of the installation process for a containerized energy storage system with a multi-stage sealing structure. Figure 17 This is the eighth schematic diagram of the installation process for a containerized energy storage system with a multi-stage sealing structure. Figure 18 This is the ninth schematic diagram of the installation process for a containerized energy storage system with a multi-stage sealing structure. Figure 19 This is the tenth schematic diagram of the installation process for a containerized energy storage system with a multi-stage sealing structure. Figure 20 , 21 This is a basic schematic diagram of a containerized energy storage system with a multi-stage sealing structure. Figure 22 This is a schematic diagram of other forms of prefabricated container energy storage cabins with multi-stage sealing structures.

[0015] The components are as follows: 1-Sealed battery compartment, 2-Liquid-cooled engine compartment, 3-Combiner control compartment, 4-Fire compartment, 5-Sealed battery compartment, 6-High-pressure compartment location, 7-Primary liquid-cooled pipe, 8-Liquid-cooled pipe wiring location, 9-Ventilation space, 10-Prefabricated energy storage compartment door panel, 11-Air inlet louvers, 12-Explosion-proof fan, 13-Secondary and tertiary liquid-cooled pipes, 14-Carbon steel plate, 15-Rock wool, 16-Partition space, 17-Liquid-cooled plate, 18-Inlet three-stage water pipe, 19-Outlet three-stage water pipe, 20-Front cover plate, 21-Low-voltage communication terminal, 22-Battery cell assembly, 23-Explosion-proof valve, 24-Maintenance switch. 25-High voltage terminal, 26-Fire sprinkler head, 27-BMU, 28-Fasting screw, 29-Battery compartment, 30-Triangular limit block, 31-Fire gas cylinder, 32-Liquid cooler, 33-Main circuit cable, 34-Bus converter control cabinet, 35-Heat conductive pad, 36-Cell baffle, 37-Fixed angle, 38-CCS, 39-CCS output terminal, 40-Lithium battery cell, 41-Threaded hole, 42-Extended bolt, 43-Connecting piece, 44-Output electrode, 45-High voltage box, 46-Series wire, 47-Dairy chain harness, 48-Fire pipe, 49-Pipe fastener. Detailed Implementation

[0016] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0017] In the following description of various examples of the present invention, reference is made to the accompanying drawings, which form part of the present invention, and which illustrate by way of example different exemplary structures, systems, and steps that can implement various aspects of the present invention. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of the present invention. Furthermore, although the terms “top,” “bottom,” “front,” “rear,” “side,” etc., may be used in this specification to describe various exemplary features and elements of the present invention, these terms are used herein only for convenience, such as the orientation of the examples as shown in the drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention.

[0018] A containerized energy storage system with a multi-stage sealing structure includes multiple compartments, such as a sealed battery compartment, a liquid-cooled engine compartment, a power control compartment, and a fire suppression compartment. The equipment carrier of the containerized energy storage system is a prefabricated energy storage compartment. The sealed battery compartment inside the prefabricated energy storage compartment is a sealed structure and independent of other compartments. The sealed battery compartment is an assembly of multiple independent sealed sub-battery compartments. Each sealed sub-battery compartment houses a battery cell assembly, providing a sealed environment for the battery cell assembly. The battery cell assemblies in multiple sealed sub-battery compartments are connected in series and parallel to form a battery array for storing electrical energy. The liquid-cooled engine compartment is used to house… The liquid chiller, with its inlet and outlet pipes connected to each sealed sub-battery compartment, cools the battery cells within. The fire-fighting compartment houses fire-fighting equipment, whose gas supply pipes connect to each sealed sub-battery compartment, providing fire protection for the battery cells within. The combiner control compartment houses the combiner control cabinet, which connects the main circuit of the battery array in the battery compartment to auxiliary circuits such as alarms, monitoring, and communication circuits, and controls the external connections and charging / discharging operation of the battery array. Multiple battery cells in the sealed sub-battery compartments are connected in series and parallel to form the battery array, used for energy storage.

[0019] As in one embodiment of the present invention, the overall protection level of the battery compartment of the prefabricated energy storage compartment of the container energy storage system is not lower than IP54, and the protection level of the sealed battery compartment inside the prefabricated energy storage compartment of the container energy storage system is not lower than IP67.

[0020] As in one embodiment of the present invention, the container energy storage system equipment carrier is a prefabricated energy storage compartment, which is a standard 20-foot prefabricated compartment, 6058mm*2438mm*2896mm.

[0021] As in one embodiment of this utility model, the sealed battery compartment inside the container energy storage system is divided into 96 identical sealed battery compartments. Eight sealed battery compartments are arranged in a row in the vertical direction to form a cluster, and there are a total of 12 clusters. Each cluster is equipped with a high-voltage box. Four battery cell groups are placed inside each sealed battery compartment, with a total of 52 battery cells connected in series. The rated voltage of each battery cell is 3.2V. The rated voltage of each cluster is 1,331.2V. The 12 clusters are connected in parallel to form the battery array of the battery compartment.

[0022] In one embodiment of this utility model, the partition between the sealed sub-battery compartment and the adjacent sealed sub-battery compartment is made of metal. Metal materials include carbon steel plates, stainless steel, etc.

[0023] In one embodiment of this utility model, various pipes, cables, etc. are built into the support structure space on both sides of the battery cell sealing chamber.

[0024] In one embodiment of this utility model, the four battery cell groups are placed directly inside the sealed battery compartment, and there is no physical isolation between the battery cell groups and the side walls (partitions) of the sealed sub-battery compartment.

[0025] As in one embodiment of the present invention, the interior of the sealed sub-battery compartment is coated with a high-temperature resistant coating, and a fireproof partition is formed between adjacent sealed sub-battery compartments.

[0026] As in one embodiment of the present invention, the sealed sub-battery compartment is provided with a fire sprinkler interface, so that external fire spray can enter the sealed sub-battery compartment when necessary.

[0027] As in one embodiment of the present invention, the sealed sub-battery compartment is provided with a water spray head interface, so that external fire-fighting water can enter the sealed sub-battery compartment when necessary.

[0028] In this invention, multiple battery cells are combined and placed into a sealed sub-battery compartment to generate the voltage and energy required by the energy storage system. All the battery cells then form a battery cell array. The battery cell array is formed by placing all the sealed battery compartments (the small cells in the middle) into the battery cell assembly.

[0029] This utility model discloses a containerized energy storage system with a multi-stage sealing structure and a method for manufacturing such a system. The equipment carrier of the containerized energy storage system with a multi-stage sealing structure is a prefabricated energy storage compartment, which serves as a support and protection component for the battery compartment. The battery compartment protection level of the prefabricated energy storage compartment is not lower than IP54, and the sealed battery compartment protection level is not lower than IP67. The sealed battery compartment consists of multiple sealed sub-battery compartments, each containing a battery cell assembly. The battery cell assemblies in the multiple sealed sub-battery compartments are connected in series and parallel to form a battery array. This design reduces the battery pack casing required in traditional designs, thereby reducing material and production costs, improving production efficiency, reducing volume, increasing energy density, and facilitating maintenance.

[0030] The containerized energy storage system features a multi-level sealing structure. It comprises multiple compartments, including a sealed battery compartment, a liquid cooling compartment, a manifold control compartment, and a fire protection compartment. These compartments together form a 20-foot container with external dimensions of 6058mm*2438mm*2896mm. In special circumstances, the liquid cooling compartment, manifold control compartment, and fire protection compartment can also be arranged separately and independently.

[0031] Because 20-foot containers are currently the most common container size and the standard cargo hold for ocean shipping; the container energy storage system with a multi-level sealing structure is a sealed structure with a protection level of not less than IP54. The carrier of the container energy storage system is the energy storage prefabricated compartment. The sealing inside the energy storage prefabricated compartment is a sealed structure and is independent of other compartments. The sealed battery compartment is composed of multiple sealed sub-battery compartments. Each sealed sub-battery compartment is used to place the battery cell assembly. The partitions between the sealed sub-battery compartments and the adjacent sealed sub-battery compartments are made of metal.

[0032] The liquid cooling compartment houses the liquid cooler, whose inlet and outlet water pipes are connected to each sealed battery compartment to cool or heat the battery cells in each compartment for thermal management.

[0033] The fire compartment is used to house fire-fighting equipment, including fire communication harnesses, hazardous gas detectors, sprinklers, etc. The gas supply pipes of the fire-fighting equipment are connected to each sealed battery compartment to provide fire protection for the battery cells inside the sealed battery compartment.

[0034] The combiner control compartment houses the combiner control cabinet, which connects the main circuit of the battery array and auxiliary circuits such as alarms, monitoring, and communication, and controls the external connections and charging / discharging operation of the battery array in the battery compartment.

[0035] Multiple sealed sub-battery compartments are connected in series and parallel to form a battery array for storing electrical energy. Various pipes and cables are built into the support structure space on both sides of the sealed sub-battery compartment. The high-voltage and low-voltage wiring harnesses between adjacent sealed sub-battery compartments in the same cluster are located in the support structure space on both sides of the sealed sub-battery compartment for easy protection.

[0036] The containerized energy storage system features a multi-level sealing structure. The battery compartment of the prefabricated energy storage module has an overall protection level of IP54, preventing external rainwater and dust from entering the containerized energy storage system during use. The internal sealed battery compartment of the prefabricated energy storage module has a protection level of no less than IP67, preventing external rainwater and dust from entering the internal sealed battery compartment of the containerized energy storage system during use and affecting the battery cells.

[0037] The containerized energy storage system is a standard 20-foot prefabricated container; other non-standard containers of different sizes can also be manufactured according to the contents of this utility model.

[0038] The containerized energy storage system has a multi-stage sealing structure. The sealed battery compartment inside the containerized energy storage system is divided into 96 identical sealed sub-battery compartments, 48 ​​on each side and 8 in each row in the vertical direction, forming a cluster. There are a total of 12 clusters, and each cluster is equipped with a high-voltage box.

[0039] Each sealed sub-battery compartment houses four cell groups, with each cell group consisting of 13 cells connected in series, for a total of 52 cells connected in series. The rated voltage of each cell is 3.2V, and the rated voltage of each cluster is 1,331.2V. Twelve clusters are connected in parallel to form the battery array of the battery compartment. This is currently the most common form of battery array. Taking CATL's 314Ah cells as an example, the capacity of the entire containerized energy storage system is 5MWh.

[0040] The containerized energy storage system with a multi-stage sealing structure has four battery cells placed directly inside the sealed sub-battery compartment, with no physical isolation between the battery cells and the side walls of the sealed sub-battery compartment.

[0041] The containerized energy storage system with a multi-stage sealing structure has a high-temperature resistant coating sprayed inside the sealed sub-battery compartments, forming fireproof partitions between adjacent sealed sub-battery compartments, which can effectively prevent the spread of fire after thermal runaway of the battery cells.

[0042] The containerized energy storage system with a multi-stage sealing structure has fire sprinkler interfaces inside the sealed sub-battery compartment. The sprinklers face the battery cells and can be used to extinguish fires from the outside in case of fire. If necessary, they can enter the sealed sub-battery compartment to extinguish the fire; for example, perfluorohexanone.

[0043] The containerized energy storage system with a multi-stage sealing structure has water sprinkler heads inside the sealed battery compartment, with the sprinklers facing the battery cells. In the event of a fire, external fire-fighting water can enter the sealed battery compartment to extinguish the fire if necessary.

[0044] The containerized energy storage system with a multi-stage sealing structure has a liquid cooling plate at the bottom of the sealed sub-battery compartment. The liquid cooling plate has an inlet and an outlet. Low-temperature coolant enters from the inlet of the liquid cooling plate and flows out from the outlet, carrying away the heat generated by the battery cells during operation. This reduces the temperature of the battery cells that are heated during operation, keeping the temperature of the cells within a reasonable range, or heating the battery cells in low-temperature environments.

[0045] In a containerized energy storage system with a multi-stage sealing structure, four battery cells in the sealed sub-battery compartment contact a liquid cooling plate via thermal pads. Because the liquid cooling plate is relatively thin and easily deformed, it is not a load-bearing component for the four battery cells. The load-bearing component for the four battery cells is a rigid insulating material. The rigid insulating material and the liquid cooling plate are independent of each other and are independently fixed to the support columns inside the sealed battery compartment. When the liquid cooling plate is installed into the sealed battery compartment, the bottom of the liquid cooling plate needs to be combined with the rigid insulating material. The bottom of the liquid cooling plate and the rigid insulating material have a detachable structure, which facilitates the assembly of the containerized energy storage system.

[0046] The containerized energy storage system with a multi-stage sealing structure uses a liquid-cooled plate as a partition between adjacent sealed sub-battery compartments. At the same time, no insulation layer is installed below the liquid-cooled plate. The liquid-cooled plate can remove heat from both the upper and lower sealed sub-battery compartments at the same time, which can effectively reduce the temperature difference between the upper and lower cells inside the sealed battery compartment.

[0047] The containerized energy storage system with a multi-stage sealing structure employs liquid cooling for temperature control. The coolant is a 50% ethylene glycol solution. The liquid chiller is connected to the liquid cooling plate inlet and outlet pipes of each sealed sub-cell via inlet and outlet pipes, respectively, to achieve temperature control through circulation. The inlet and outlet pipes connected to the liquid cooling plate are integrated inside the partition between adjacent sealed sub-cells. The partition contains built-in cables, liquid cooling pipes, and inlet and outlet pipes. Fire suppression pipes can also be installed. The pipes are fixed using non-metallic structural components, typically injection-molded parts, designed to secure various cables and pipes. During installation, the non-metallic structural components, cables, and pipes are first combined to form a module. The module is then placed inside the partition between adjacent sealed sub-battery compartments. The inlet and outlet pipes of each liquid-cooled plate in the containerized energy storage system are independent. Before the cell assembly is placed in the sealed sub-battery compartment, the module is pre-placed in the partition space between adjacent sealed battery compartments. The inlet and outlet pipes of the liquid-cooled plate, as well as the cables, pipes, and liquid-cooled plate, are not related to the cell assembly. This design allows for the simultaneous installation of accessories for the prefabricated energy storage compartment before the cell assembly is installed, improving work efficiency. Furthermore, it eliminates the need for disassembly when maintaining the cell assembly in the future.

[0048] The containerized energy storage system with a multi-stage sealing structure has a detachable front cover for the sealed sub-battery compartment. The front cover is equipped with an explosion-proof valve, high-voltage terminals, low-voltage terminals, fire sprinklers, maintenance switches, etc. The edge of the front cover of the sealed battery compartment has a sealing strip. After the four battery cells are placed into the sealed battery compartment, fixed and connected, the front cover is installed to complete the sealing of the sealed battery compartment.

[0049] A containerized energy storage system with a multi-stage sealing structure is disclosed. Ventilation equipment, primarily explosion-proof fans and air inlet louvers, is installed on the battery compartment door. The gas exhaust channel is located between the sealed battery compartment and the prefabricated energy storage door panel. The air inlet louvers are used to allow air in, while the explosion-proof fans are used to extract air from the gas exhaust channel. The explosion-proof fans and air inlet louvers are arranged diagonally on opposite sides of the battery compartment, maximizing the distance between them and preventing short circuits or dead zones. Furthermore, the gas exhaust channel has no dead zones, making it easier to completely remove flammable, explosive, and hazardous materials.

[0050] The method for manufacturing a containerized energy storage system with a multi-stage sealing structure is to follow a three-stage assembly sequence of battery cell, battery cell assembly, and container. First, four battery cell assemblies are placed one by one into the sealed battery compartment. Then, they are fixed and connected to the main circuit. Next, auxiliary circuits such as alarm, monitoring, and communication circuits of the battery cell assembly are connected. Finally, the front baffle of the sealed battery compartment is installed to complete the assembly of the sealed sub-battery compartment. Finally, the energy storage part of the containerized energy storage system is formed by connecting all the battery cell assemblies in the sealed sub-battery compartments in series and parallel.

[0051] Unlike the traditional four-stage assembly sequence of cell-cell pack-battery pack-container, this design eliminates the battery pack structure and reduces the number of production lines.

[0052] A method for manufacturing a containerized energy storage system with a multi-stage sealing structure involves placing the battery cell assembly and its load-bearing rigid insulation components together into a sealed sub-battery compartment. The battery cell assembly and its load-bearing rigid insulation components need to be fixed together before being placed into the sealed sub-battery compartment as a whole. The rigid insulation components can maintain the insulation performance of the battery cell assembly to ground to meet the relevant electrical performance requirements.

[0053] The maintenance method for containerized energy storage systems with multi-level sealing structures involves removing the front baffle of the sealed sub-battery compartment corresponding to the faulty cell group during maintenance, and then individually removing the cell group that needs maintenance from the sealed sub-battery compartment for replacement. It is not necessary to replace other non-faulty cell groups in the same sub-sealed compartment.

[0054] The maintenance method for containerized energy storage systems with multi-level sealing structures involves removing the front baffle of the sealed sub-compartment corresponding to the cell group that needs to be recharged during maintenance. Then, the cell group that needs to be maintained in the sealed sub-compartment battery compartment is taken out separately for recharging. It is not necessary to deal with other cell groups that do not need to be recharged in the same sealed sub-compartment battery compartment.

[0055] The maintenance method for containerized energy storage systems with multi-stage sealing structures involves removing the battery cells and their load-bearing insulation components together from the sealed sub-battery compartment, and then replacing or recharging the battery cells that require maintenance.

[0056] The maintenance method for containerized energy storage systems with multi-stage sealing structures involves removing the battery cells and their load-bearing rigid insulation components from the sealed battery compartment. Only the fixing screws of the battery cells, the main circuit circuit, and the auxiliary circuit need to be removed, without disassembling the liquid cooling system. This method is simple to operate and requires minimal work.

[0057] The method of containerized energy storage system with multi-stage sealing structure is to put modules with different numbers of cells in series into a general containerized energy storage system. This allows the use of a single general containerized energy storage system to achieve containerized energy storage systems of different capacities. In particular, if the DC energy storage system required by the customer is not an integer multiple of 5MWh, it can be assembled using cell groups with a reduced number of cells. At the same time, the containerized energy storage system is universal and does not require replacement, reducing the amount of design and construction work.

[0058] The above description uses a 5MWh containerized DC energy storage system as an example. This invention also applies to AC / DC integrated energy storage compartments. Modifications and optimizations made by those skilled in the art based on this invention are all within the scope of protection of this invention. For example, adding an external liquid cooler, using other specifications of battery cells for the battery array, increasing or decreasing the size and number of sealed battery compartments, such as placing 104 battery cells in each sealed battery compartment, doubling the volume of each sealed battery compartment, and reducing the number of cells in each sealed battery compartment by half, are also within the scope of protection of this invention.

[0059] like Figure 1 , 2 As shown, a prefabricated energy storage compartment for a containerized energy storage system with a multi-stage sealing structure is a standard 20-foot container, mainly comprising: a battery compartment 29, a combiner control compartment 3, a fire-fighting compartment 4, a liquid-cooled compartment 2, and the combiner control compartment 3 and fire-fighting compartment 4 can be combined into one compartment; the combiner control compartment 3 is used to house the combiner control integrated cabinet, the fire-fighting compartment 4 is used to house fire-fighting equipment such as fire cylinders and fire-fighting main units, and is used to house the battery array; the sealed battery compartment 1 is used to house the battery array, and the liquid-cooled compartment 2 is used to house the liquid-cooled unit, which is a 60KW liquid-cooled unit in this embodiment. The battery compartment 2 has an IP54 protection rating, and the sealed battery compartment has an IP67 protection rating. The sealed battery compartment is located inside the energy storage prefabricated compartment door 10 of the battery compartment 2, and is used to house the battery array; the sealed battery compartment 1 is used to house the battery array, and there is a ventilation space between the battery compartment and the sealed battery compartment.

[0060] like Figure 3 As shown, a container energy storage system with a multi-stage sealing structure is described. The sealed battery compartment 1 inside the energy storage prefabricated compartment is divided into 96 identical sealed battery compartments 5, which are symmetrical from left to right. There are 48 sealed battery compartments 5 on each side and 8 sealed battery compartments 5 in a row from top to bottom, forming a total of 12 clusters. Each cluster is equipped with a high-voltage box 45 position 6. Above the sealed battery compartment 1 is the liquid cooling pipe wiring position 8, which is used to place the liquid cooling pipe 7 and perform wiring.

[0061] like Figure 4 As shown, a container energy storage system with a multi-stage sealing structure has gas exhaust ventilation spaces 9 in the left and right symmetrical directions of the sealed battery compartment 1 inside the energy storage prefabricated compartment. The gas exhaust channel 9 is located between the sealed battery compartment 1 and the energy storage prefabricated compartment door panel 10. Air inlet louvers 11 and explosion-proof fans 12 are installed on the energy storage prefabricated compartment door panel 10 in the diagonal direction of the gas exhaust channel 9.

[0062] like Figure 5As shown, a container energy storage system with a multi-stage sealing structure has 96 identical sealed battery compartments 5 inside the energy storage prefabricated compartment, each with a liquid cooling plate 17. The compartments are composed of partitions on three sides, which separate them from other adjacent sealed battery compartments 5 and are tightly connected. Each of the 96 identical sealed battery compartments 5 has two liquid cooling pipes and secondary pipes 13 on both sides.

[0063] like Figure 6 As shown, the partition between adjacent sealed battery compartments 5 is made of carbon steel plate with a thickness of less than 3mm on the outside and high-density rock wool 15 on the inside. This provides thermal insulation and flame retardancy.

[0064] like Figure 7 As shown, a container energy storage system with a multi-stage sealing structure has a partition space 16 between adjacent sealed battery compartments 5. The partition space 16 has a pipe fixing component 49. The pipe fixing component 49 and two liquid cooling secondary pipes 13 are combined together to form a component. The entire component is placed inside the partition space 16 between the adjacent sealed battery compartments 5.

[0065] like Figure 8 As shown, a container energy storage system with a multi-stage sealing structure has threaded holes 41 on the liquid cooling plate 17 in the sealed battery compartment 5 for fixing the battery cell assembly 22. At the same time, the liquid cooling plate 17 is connected to the secondary pipes 13 of the liquid cooling pipe.

[0066] like Figure 9 As shown, a container energy storage system with a multi-stage sealing structure has a triangular limiting block 30 at the rear of the liquid cooling plate in the sealed battery compartment 5, which is used to limit and fix the battery cell assembly 22.

[0067] like Figure 10 As shown, the installation process of a container energy storage system with a multi-stage sealing structure is as follows: First, assemble the accessories of the container energy storage system, including the liquid cooler 34, the combiner cabinet 32, the fire-fighting gas cylinder 31, the primary liquid cooling pipe 7, the secondary pipe 13, and the fire-fighting pipe 48, and connect them accordingly to complete the preparation work for installing the battery cell assembly 22.

[0068] like Figure 11 As shown, the battery cell assembly 22 is composed of multiple battery cells 40, which are clamped and fixed by battery cell baffles 36 on both sides. The CCS 38, which collects voltage and temperature data, is welded onto the battery cell 40. The two CCS output terminals 39 and two output electrodes 44 of the CCS 38 are located on the same side of the battery cell assembly 22, and a triangular fixing angle 37 is provided below on the other side.

[0069] like Figure 12 , 13As shown, the installation process of a container energy storage system with a multi-stage sealing structure is as follows: the liquid cooling plate 17 is installed inside the energy storage prefabricated compartment to form 96 identical sealed battery compartments 5, the primary pipe 7, the secondary and tertiary liquid cooling pipes 13 are connected to the liquid cooling plate 17, and a heat-conducting pad 35 is laid on each liquid cooling plate 17.

[0070] like Figure 14 , 15 As shown, the installation process of a container energy storage system with a multi-stage sealing structure is as follows: the battery cell assembly 22 is installed inside the sealed battery compartment 5, and the triangular fixing angle 37 of the battery cell assembly 22 is placed under the triangular limiting block 30 at the rear of the liquid cooling plate 17 for limiting. The operation is carried out outside the sealed battery compartment 5. The battery cell assembly 22 is fixed on the liquid cooling plate 17 by using the extended bolt 42 to pass through the battery cell end plate 36 and connect to the threaded hole 41 on the liquid cooling plate 17.

[0071] like Figure 16 As shown, a container energy storage system with a multi-stage sealing structure is described. Each of the 96 identical sealed battery compartments 5 inside the prefabricated energy storage compartment can hold 4 battery cell groups 22. The 4 battery cell groups 22 are in contact with the liquid cooling plate 17 at the bottom of the sealed battery compartment 5. The outlet triode pipe 19 and the inlet triode pipe 18 on the secondary and tertiary pipes of the liquid cooling pipe are respectively connected to the liquid cooling plate 17. The liquid cooling plate 17 can heat or cool the battery cell groups 22 inside the sealed battery compartment 5.

[0072] like Figure 17 , 18 As shown in Figure 19, the front cover plate 20 is equipped with an explosion-proof valve 23, a maintenance switch 24, a high-voltage terminal 25, a fire sprinkler head 26, and a BMU 27. The front cover plate 20 is combined with the corresponding sealed battery compartment 5. The front cover plate 20 is sealed with the corresponding sealed battery compartment 5 by fastening screws 28, completing the complete sealing of the individual sealed battery compartment 5 with a protection level ≥ IP67. Then, a high-voltage box 45 is installed below the sealed battery compartment 1, arranged vertically in a cluster. One high-voltage box 45 is placed below each cluster, for a total of 12. The high-voltage terminal 25 on the front cover plate 20 of each cluster is connected to the high-voltage box 45 in series using a series wire 46 to complete the main circuit connection. The low-voltage communication terminal 21 on the front cover plate 20 of each cluster is connected to the high-voltage box 45 in series using a daisy chain harness 47 to complete the communication connection. Finally, the fire sprinkler head 26 on the front cover plate 20 is connected to the fire pipe 28 integrated in the sealed battery compartment to complete the fire protection system connection.

[0073] like Figure 20 , 21As shown, after the energy storage system is installed according to this electrical schematic, the cell array and high-voltage box 45 arranged in the sealed battery compartment 1 form the main circuit through cables. The cables are collected at the bottom of the prefabricated energy storage compartment and converged into the combiner cabinet 34 in the combiner compartment 3 for current convergence, assembling into a complete 20-foot containerized energy storage system. like Figure 22 The sealed battery compartment 5 of the prefabricated energy storage module can also be expanded in size to accommodate larger battery cell packs; it can also be used in containerized energy storage systems that require multiple sealing operations.

[0074] Compared with the prior art, this utility model eliminates the outer shell protection structure of the battery pack in the prior art, and replaces the original battery pack sealing of the battery cells with the sealing of the battery compartment to the battery cells.

[0075] The benefits are: 1. Reduced production costs, fewer materials, and shorter production time.

[0076] 2. Improved production efficiency: prefabricated energy storage modules can be prefabricated in advance, shortening the manufacturing cycle and eliminating the need for battery pack production lines.

[0077] 3. Improved safety and good flame retardant effect; no dead corners and good ventilation.

[0078] 4. Easy to maintain: When maintaining the battery cells, there is no need to remove the liquid cooling pipes or take out the battery cells.

[0079] Those skilled in the art to which this utility model pertains should understand that the specific structures and processes shown in the above detailed embodiments are merely exemplary and not restrictive. Furthermore, those skilled in the art can combine the various technical features described above in various possible ways to form new technical solutions or make other modifications, all of which fall within the scope of this utility model.

Claims

1. A container energy storage system with a multi-stage seal structure, characterized by, include: The prefabricated energy storage compartment serves as the equipment carrier for the containerized energy storage system. It contains a sealed battery compartment, which is a sealed structure and independent of other compartments. The sealed battery compartment is used to house the battery array and is divided into multiple sealed sub-battery compartments. Each sealed sub-battery compartment includes several cell groups. The sealed battery compartment provides a uniform sealed environment for all cell groups. The cell groups in the multiple sealed sub-battery compartments are connected in series and parallel. The liquid cooling chamber is equipped with a liquid cooler. The inlet and outlet pipes of the liquid cooler are connected to each sealed battery compartment to cool the battery cells in each sealed battery compartment. The combiner control compartment houses the combiner control cabinet, which connects the main circuit and alarm, monitoring, and communication auxiliary circuits of the battery array within the sealed battery compartment, and controls the external connections and charging / discharging operation of the battery array within the sealed battery compartment.

2. The container energy storage system with a multi-stage sealing structure according to claim 1, characterized in that, The sealed battery compartment includes 96 sealed sub-battery compartments, all of which are identical and independently arranged. Eight compartments are arranged in a vertical row, forming a cluster, for a total of 12 clusters. Each cluster is equipped with a high-voltage box. Each sealed sub-battery compartment contains four lithium-ion cell groups, for a total of 52 cells connected in series. The rated voltage of the lithium-ion cells is 3.2V, and the rated voltage of each cluster is 1331.2V. The 12 clusters are connected in parallel to form the battery array within the sealed battery compartment.

3. The container energy storage system with a multi-stage sealing structure according to claim 1, characterized in that, A metal partition is provided between two adjacent sealed sub-battery compartments. The partition is filled with refractory material, including rock wool. The interior of the sealed sub-battery compartment is sprayed with a high-temperature resistant coating, forming a fireproof partition between the adjacent sealed sub-battery compartments.

4. The containerized energy storage system with a multi-stage sealing structure according to claim 3, characterized in that, The partition contains built-in cables, liquid cooling pipes, and water inlet and outlet pipes, which are fixed by non-metallic structural components.

5. The container energy storage system with a multi-stage sealing structure according to claim 2, characterized in that, The bottom of the sealed sub-battery compartment is a liquid cooling plate, and the four battery cells are placed on the liquid cooling plate at the bottom of the sealed sub-battery compartment.

6. The containerized energy storage system with a multi-stage sealing structure according to claim 1, characterized in that, The sealed sub-battery compartment is provided with a removable front cover plate, and the front cover plate is provided with a sealing structure to seal the sealed sub-battery compartment. The rear of the sealed sub-battery compartment has a structure for fixing the battery cell assembly, which is used to tighten and fix the battery cell assembly.

7. The container energy storage system with a multi-stage sealing structure according to claim 1, characterized in that, The containerized energy storage system also includes a fire compartment, which houses fire-fighting equipment. The gas supply pipes of the fire-fighting equipment are connected to each sealed sub-battery compartment to provide fire protection for the battery cells inside the sealed sub-battery compartment.

Images