Energy storage container and energy storage system

Abstract

This application relates to the field of energy storage device technology and provides an energy storage container and energy storage system. The energy storage container of this application includes a container body, multiple battery modules disposed within the container body, and connecting components capable of connecting the battery modules and external circuits. Each battery module includes multiple lithium iron phosphate (LFP) cells stacked sequentially along a predetermined direction, and at least one sodium-ion battery cell disposed between adjacent LFP cells. By placing the sodium-ion battery cell between adjacent LFP cells, the energy storage container of this application, due to the higher thermal runaway temperature and safety of sodium-ion cells, can replace insulation materials to separate adjacent LFP cells, thus preventing the spread of thermal runaway and providing better safety and improving the operational stability of the energy storage container.

Description

Technical Field

[0001] This application relates to the field of energy storage device technology, and in particular to an energy storage container and energy storage system. Background Technology

[0002] Electrochemical energy storage devices are a common type of energy storage device. Energy storage devices that use lithium-ion cells as energy storage units have the advantages of high energy density and long cycle life, and are widely used in many industries.

[0003] Energy storage containers are a common type of energy storage device. When they use lithium iron phosphate (LFP) battery cells, these cells are susceptible to thermal runaway under extreme conditions such as overcharging and overheating. When one LFP cell experiences thermal runaway, adjacent LFP cells are easily affected by the heat and may also experience thermal runaway. This can then spread between the LFP cells, severely impacting the operation of the energy storage container and hindering its stability. Utility Model Content

[0004] In view of this, this application aims to propose an energy storage container to improve the stability of energy storage container use.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: An energy storage container includes a container body, a plurality of battery modules disposed in the container body, and a connection component capable of connecting the battery modules and an external circuit. The battery module includes a plurality of lithium iron phosphate cells stacked sequentially along a preset direction, and at least one sodium-ion cell arranged between adjacent lithium iron phosphate cells.

[0006] Furthermore, the battery module also includes a first current-carrying component and a second current-carrying component; The first overcurrent component is electrically connected to each of the lithium iron phosphate cells to form a lithium battery pack; The second overcurrent assembly electrically connects each of the sodium-ion cells to form a sodium battery pack.

[0007] Furthermore, in the battery module, both the lithium iron phosphate cell and the sodium ion cell have single-sided terminals, and the terminals of the lithium iron phosphate cell and the sodium ion cell face opposite directions.

[0008] Furthermore, the lithium iron phosphate battery cell is provided with a first explosion-proof valve at the end away from its own electrode post, and the sodium ion battery cell is provided with a second explosion-proof valve at the end away from its own electrode post.

[0009] Furthermore, the energy storage container includes multiple battery clusters, each battery cluster comprising multiple battery modules stacked sequentially. In each of the battery clusters, each of the lithium battery packs is arranged in series and is provided with a lithium battery positive output terminal and a lithium battery negative output terminal, and each of the sodium battery packs is arranged in series and is provided with a sodium battery positive output terminal and a sodium battery negative output terminal.

[0010] Furthermore, the battery cluster includes a first energy storage converter connected to the positive output terminal and the negative output terminal of the lithium battery, and a second energy storage converter connected to the positive output terminal and the negative output terminal of the sodium battery. The connection component includes an AC combiner module, which connects each of the first energy storage converters and each of the second energy storage converters. The connection component is connected to an external circuit through the AC combiner module.

[0011] Furthermore, the battery cluster includes a first high-voltage box connecting the positive output terminal and the negative output terminal of the lithium battery, and a second high-voltage box connecting the positive output terminal and the negative output terminal of the sodium battery. The connection component includes a first DC combiner module connecting each first high-voltage box and a second DC combiner module connecting each second high-voltage box. The connection component is connected to an external circuit through the first DC combiner module and the second DC combiner module.

[0012] Furthermore, the connection assembly includes a DC combiner cabinet, in which the first DC combiner module and the second DC combiner module are integrated.

[0013] Furthermore, in each of the battery clusters, the positive output terminal and the negative output terminal of the lithium battery are arranged on one side, and the positive output terminal and the negative output terminal of the sodium battery are arranged on the other side.

[0014] Compared with related technologies, this application has the following advantages: (1) The energy storage container described in this application, by placing sodium-ion battery cells between adjacent lithium iron phosphate battery cells, can replace the insulation material and separate adjacent lithium iron phosphate battery cells because sodium-ion battery cells have higher thermal runaway temperature and safety. This helps to prevent the spread of thermal runaway and thus has better safety. It also helps to improve the stability of the energy storage container. While reducing production costs, it also increases energy density compared to energy storage containers that only use sodium-ion batteries.

[0015] (2) Setting up a first overcurrent component and a second overcurrent component can combine the lithium iron phosphate cells of the same battery module into a lithium battery pack and the sodium ion cells into a sodium battery pack. This design makes the lithium battery pack and the sodium battery pack relatively independent, which facilitates separate current control and management of different types of battery packs.

[0016] (3) By setting both lithium iron phosphate cells and sodium ion cells to single-sided terminal posts with opposite orientations, the internal structure layout of the battery module is optimized. The opposite orientation of the terminals makes wiring more convenient and compact when connecting the battery pack, reducing the length and complexity of the connection lines, reducing line resistance, thereby reducing energy loss during transmission, improving the energy transmission efficiency of the battery module, and making the overall structure of the battery module more regular, which is convenient for installation and maintenance.

[0017] (4) A first explosion-proof valve is installed at the end of the lithium iron phosphate cell away from its own electrode, and a second explosion-proof valve is installed at the end of the sodium ion cell away from its own electrode. This allows the explosion-proof valves of the lithium iron phosphate cell and the sodium ion cell to be located in different pressure relief channels, making the lithium iron phosphate cell and the sodium ion cell more independent and improving the safety of the battery module.

[0018] (5) The arrangement of multiple battery clusters increases the energy storage capacity of the energy storage container. The lithium battery packs and sodium battery packs in each battery cluster are arranged in series and have corresponding output terminals, which facilitates the integration and output of the electrical energy of multiple battery modules. At the same time, the series arrangement can improve the output voltage, meet the voltage level requirements of different external circuits, enhance the flexibility and adaptability of the energy storage container to external circuits, and can be better applied to various energy storage system scenarios.

[0019] (6) The first energy storage converter in the battery cluster is connected to the output terminal of the lithium battery pack, the second energy storage converter is connected to the output terminal of the sodium battery pack, and then connected to the external circuit through the AC combiner module. This design can convert the DC power output by the battery pack into AC power, and then collect and integrate the AC power before outputting it to the external circuit. The energy storage converter can accurately control the charging and discharging process of the battery pack to achieve efficient conversion and transmission of electrical energy. The AC combiner module can uniformly manage and distribute the AC power output by multiple energy storage converters, thereby improving the efficiency and stability of energy interaction between the entire energy storage container and the external circuit.

[0020] (7) The first high-voltage box is connected to the output terminal of the lithium battery pack, the second high-voltage box is connected to the output terminal of the sodium battery pack, and the first DC combiner module and the second DC combiner module are connected to each high-voltage box and then connected to the external circuit. This realizes the high-voltage transmission and combiner processing of the DC output of the battery pack. It can realize the conversion of DC to AC through the external high-power energy storage converter. When in use, multiple energy storage containers can use the same energy storage converter, which simplifies the internal structure of the energy storage container.

[0021] (8) The first DC combiner module and the second DC combiner module are integrated in the DC combiner cabinet, making the entire DC combiner system more compact and centralized, which is convenient for installation, debugging and maintenance. At the same time, it reduces the floor space, optimizes the internal space layout of the energy storage container, and improves the overall integration and practicality of the energy storage container.

[0022] (9) In each battery cluster, the positive and negative output terminals of lithium batteries are arranged on one side, and the positive and negative output terminals of sodium batteries are arranged on the other side. This layout makes the output lines of the battery cluster clearer and more organized, which is convenient for wiring and connection. At the same time, when connecting the battery cluster to external circuits or maintaining and repairing the battery cluster, it is easier to distinguish and operate the output lines of the lithium battery pack and the sodium battery pack, reducing the possibility of misoperation and improving the convenience and safety of operation.

[0023] This application also proposes an energy storage system, which includes the aforementioned energy storage container.

[0024] The energy storage system described in this application uses the aforementioned energy storage container. By placing sodium-ion batteries between adjacent lithium iron phosphate batteries in the battery module, the sodium-ion batteries, due to their higher thermal runaway temperature and safety, can replace insulation materials to separate adjacent lithium iron phosphate batteries. This helps prevent the spread of thermal runaway, thus providing better safety, improving the stability of the energy storage container, and ultimately enhancing the operational reliability of the energy storage system. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the internal structure of the energy storage container described in the embodiments of this application; Figure 2 This is a front view of the energy storage container described in the embodiments of this application; Figure 3 This is a schematic diagram of the battery module assembled and packaged into a battery pack according to an embodiment of this application; Figure 4 This is a wiring diagram of the battery cluster described in an embodiment of this application; Figure 5 This is a schematic diagram of the battery module described in an embodiment of this application; Figure 6 for Figure 5 A diagram from another perspective; Figure 7 This is a front view of another energy storage container described in an embodiment of this application; Figure 8 for Figure 7 A schematic diagram of the wiring between the energy storage container and external equipment; Explanation of reference numerals in the attached figures: 1. Box body; 2. Battery module; 201. Lithium iron phosphate cell; 202. Sodium-ion cell; 203. First overcurrent assembly; 2031. First busbar; 2032. First output terminal; 2033. First fuse device; 204. Second overcurrent assembly; 2041. Second busbar; 2042. Second output terminal; 2043. Second fuse device; 3. Connecting components; 301. AC combiner cabinet; 302. DC combiner cabinet; 4. Battery clusters; 401. First energy storage converter; 402. Second energy storage converter; 403. Lithium battery positive output terminal; 404. Lithium battery negative output terminal; 405. Sodium battery positive output terminal; 406. Sodium battery negative output terminal; 5. Lithium-ion battery energy storage converter; 6. Sodium-ion battery energy storage converter; 7. Transformer; 8. Lower casing; 9. Upper shell; 10. Repair the cover plate; 11. Fire protection module; 12. Thermal Management Module. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0028] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0030] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] An embodiment of the first aspect of this application provides an energy storage container to improve the stability of the energy storage container in use.

[0033] Among related technologies, electrochemical energy storage devices are a common type of energy storage device. Energy storage devices that use lithium-ion cells as energy storage units have the advantages of high energy density and long cycle life, and are widely used in many industries. In particular, lithium iron phosphate cells have the advantages of high energy density and low manufacturing and usage costs.

[0034] Energy storage containers are a common type of energy storage device. When using lithium iron phosphate (LFP) battery cells, they offer high energy density and low manufacturing costs. However, LFP cells are susceptible to thermal runaway under extreme conditions such as overcharging and overheating. When one LFP cell experiences thermal runaway, adjacent LFP cells are easily affected by the heat and may also experience thermal runaway. This can then spread between the LFP cells, severely impacting the operation of the energy storage container and hindering its stability.

[0035] In view of this, in order to overcome the shortcomings of related technologies, the energy storage container in this embodiment combines... Figures 1 to 6 In terms of content and overall design, it includes a housing 1, multiple battery modules 2 disposed in the housing 1, and a connection component 3 that can connect the battery modules 2 and external circuits.

[0036] The battery module 2 includes a plurality of lithium iron phosphate cells 201 stacked sequentially along a preset direction, and at least one sodium-ion cell 202 arranged between adjacent lithium iron phosphate cells 201.

[0037] Sodium-ion battery cell 202 does not ignite or explode during overcharge, over-discharge, short circuit, and nail penetration tests. Sodium-ion battery cell 202 has a higher thermal runaway temperature and is more prone to passivation and oxidation at high temperatures, preventing spontaneous combustion. The sodium salt electrolyte has a larger electrochemical window, reducing the likelihood of electrolyte decomposition during reactions and resulting in higher system stability. Sodium-ion battery cell 202 has a higher internal resistance than lithium-ion battery cells, leading to less instantaneous heat generation and a lower temperature rise during short circuits. Its higher thermal runaway temperature also contributes to its superior safety.

[0038] Therefore, by placing the sodium-ion battery cell 202 between adjacent lithium iron phosphate battery cells 201, the sodium-ion battery cell 202, with its higher thermal runaway temperature and safety, can replace the insulation material to separate the adjacent lithium iron phosphate battery cells 201. This helps prevent the spread of thermal runaway, resulting in better safety and improved stability of the energy storage container. While reducing production costs, it also increases energy density compared to energy storage containers that only use sodium-ion batteries.

[0039] Based on the above overview, specifically, both the lithium iron phosphate cell 201 and the sodium-ion cell 202 can be in the form of square cells or blade cells, with the preset direction being the thickness direction of the corresponding cell. This stacking allows for a more compact overall structure of the battery module 2. Placing the sodium-ion cell 202 between adjacent lithium iron phosphate cells 201 allows the sodium-ion cell 202 to isolate the adjacent lithium iron phosphate cells 201.

[0040] It should be noted that when no sodium-ion battery cell 202 is arranged between adjacent lithium iron phosphate battery cells 201, thermal insulation materials such as aerogel or ceramic fiber board are required. The number of sodium-ion battery cells 202 arranged between adjacent lithium iron phosphate battery cells 201 can also be more than one. Preferably, the lithium iron phosphate battery cells 201 and sodium-ion battery cells 202 are arranged alternately, that is, a sodium-ion battery cell 202 is provided between any two adjacent lithium iron phosphate battery cells 201.

[0041] Combination Figures 3 to 6 As shown, in some exemplary embodiments, the battery module 2 further includes a first current-carrying component 203 and a second current-carrying component 204. The first current-carrying component 203 is electrically connected to each lithium iron phosphate cell 201 to form a lithium battery pack, and the second current-carrying component 204 is electrically connected to each sodium-ion cell 202 to form a sodium battery pack.

[0042] In this way, by setting up the first overcurrent component 203 and the second overcurrent component 204, each lithium iron phosphate cell 201 of the same battery module 2 can be combined into a lithium battery pack, and each sodium-ion cell 202 can be combined into a sodium battery pack. This design makes the lithium battery pack and the sodium battery pack relatively independent, which facilitates separate current control and management of different types of battery packs.

[0043] Continue to refer to Figures 3 to 6 Based on the provision of a first current-carrying component 203 and a second current-carrying component 204, in some exemplary embodiments, in the battery module 2, both the lithium iron phosphate cell 201 and the sodium-ion cell 202 have single-sided outlet posts, and the outlet posts of the lithium iron phosphate cell 201 and the sodium-ion cell 202 are oriented in opposite directions.

[0044] This configuration, by setting both the lithium iron phosphate cell 201 and the sodium-ion cell 202 as single-sided outlet posts with opposite orientations, optimizes the internal structural layout of the battery module 2. The opposite orientation of the posts makes wiring more convenient and compact when connecting the battery pack, reducing the length and complexity of the connection lines, lowering the line resistance, and thus reducing energy loss during transmission. This improves the energy transmission efficiency of the battery module 2 and makes the overall structure of the battery module 2 more regular, facilitating installation and maintenance.

[0045] Specifically, the first overcurrent assembly 203 includes a first busbar 2031, a first output terminal 2032, and a first fuse 2033. Adjacent lithium iron phosphate cells 201 have opposite positive and negative terminals. The first busbar 2031 connects adjacent terminals of different polarities of adjacent lithium iron phosphate cells 201, thus allowing for electrical connection of each lithium iron phosphate cell 201 using a shorter first busbar 2031. The first output terminal 2032 is located at the start and end points of the series path of the lithium iron phosphate cells 201, serving as the overall positive and negative terminals of the lithium battery pack for connection to other electrical components. The first fuse 2033 is connected to the positive first output terminal 2032 of the lithium battery pack and to a corresponding circuit. It automatically cuts off the circuit in case of abnormal conditions (such as overheating, short circuit, overcharging, etc.) to prevent safety accidents such as fires and explosions.

[0046] Correspondingly, the second overcurrent assembly 204 includes a second busbar 2041, a second output terminal 2042, and a second fuse 2043. Adjacent sodium-ion cells 202 have opposite positive and negative terminals. The second busbar 2041 connects adjacent sodium-ion cells 202 with opposite polarities, allowing for electrical connection of each sodium-ion cell 202 using a shorter second busbar 2041. The second output terminal 2042 is located at the start and end points of the series path of the sodium-ion cells 202, serving as the overall positive and negative terminals of the sodium battery pack for connection to other electrical components. The second fuse 2043 is connected to the positive second output terminal 2042 of the sodium battery pack and to a corresponding circuit. It automatically cuts off the circuit in case of abnormal conditions (such as overheating, short circuit, overcharging, etc.) to prevent safety accidents such as fires and explosions.

[0047] In this module, battery module 2 can be configured with multiple rows of lithium iron phosphate cells 201, which can be connected in series or in parallel. Similarly, sodium-ion cells 202 are also configured with multiple rows, which can be connected in series or in parallel. For example... Figure 5 and Figure 6 As shown, the lithium iron phosphate battery cell 201 has two rows connected in series. The two rows of lithium iron phosphate battery cells 201 are connected by a first busbar 2031 located at the end. The corresponding two rows of sodium ion battery cells 202 are also connected in series and are connected by two second busbars 2041 located at the end. Both the first fuse 2033 and the second fuse 2043 can be in the form of fuses.

[0048] Given that both the lithium iron phosphate cell 201 and the sodium ion cell 202 have single-sided outlet posts, in some exemplary embodiments, the end of the lithium iron phosphate cell 201 away from its own outlet post is provided with a first explosion-proof valve, and the end of the sodium ion cell 202 away from its own outlet post is provided with a second explosion-proof valve.

[0049] In this way, by setting a first explosion-proof valve at the end of the lithium iron phosphate cell 201 away from its own terminal and setting a second explosion-proof valve at the end of the sodium-ion cell 202 away from its own terminal, the explosion-proof valves of the lithium iron phosphate cell 201 and the sodium-ion cell 202 can be located in different pressure relief channels, making the lithium iron phosphate cell 201 and the sodium-ion cell 202 more independent and thus enhancing the safety of the battery module 2.

[0050] To facilitate the management of battery module 2, battery module 2 can be assembled and packaged into a battery pack. (Refer to...) Figure 3 and Figure 4As shown, the battery pack may include a lower housing 8, an upper housing 9, and a maintenance cover 10. The battery module 2 is mounted on the lower housing 8, and the upper housing 9 fastens the battery module 2 onto the lower housing 8. The maintenance cover 10 is screwed onto the upper housing 9, which allows the operator to easily perform internal maintenance by removing the maintenance cover 10.

[0051] Reference Figures 1 to 4 In some exemplary embodiments, the energy storage container includes multiple battery clusters 4, each battery cluster 4 including multiple battery modules 2 stacked sequentially. In each battery cluster 4, each lithium battery module is arranged in series and is provided with a lithium battery positive output terminal 403 and a lithium battery negative output terminal 404, and each sodium battery module is arranged in series and is provided with a sodium battery positive output terminal 405 and a sodium battery negative output terminal 406.

[0052] As described above, the arrangement of multiple battery clusters 4 increases the energy storage capacity of the energy storage container. The lithium battery packs and sodium battery packs in each battery cluster 4 are arranged in series and have corresponding output terminals, which facilitates the integration and output of the electrical energy of multiple battery modules 2. At the same time, the series arrangement can improve the output voltage, meet the voltage level requirements of different external circuits, enhance the flexibility and adaptability of the energy storage container to external circuits, and enable it to be better applied to various energy storage system scenarios.

[0053] Based on the configuration of multiple battery clusters 4, in some exemplary embodiments, each battery cluster 4 includes a first energy storage inverter 401 connecting the positive output terminal 403 and the negative output terminal 404 of a lithium battery, and a second energy storage inverter 402 connecting the positive output terminal 405 and the negative output terminal 406 of a sodium battery. The connection component 3 includes an AC combiner module, which connects each of the first energy storage inverters 401 and each of the second energy storage inverters 402. The connection component 3 is connected to an external circuit via the AC combiner module. Specifically, an AC combiner cabinet 301 can be provided, and the AC combiner module can be arranged within the AC combiner cabinet 301.

[0054] With this configuration, the first high-voltage box is connected to the output terminal of the lithium battery pack, and the second high-voltage box is connected to the output terminal of the sodium battery pack. The first and second DC combiner modules are connected to each high-voltage box and then to the external circuit. This realizes the high-voltage transmission and combiner processing of the DC power output from the battery pack. It can also realize the conversion of DC to AC through an external high-power energy storage converter. In use, multiple energy storage containers can use the same energy storage converter, which simplifies the internal structure of the energy storage container.

[0055] Meanwhile, based on the provision of multiple battery clusters 4, in some exemplary embodiments, in each battery cluster 4, the positive output terminal 403 and the negative output terminal 404 of the lithium battery are arranged on one side, and the positive output terminal 405 and the negative output terminal 406 of the sodium battery are arranged on the other side.

[0056] In this way, in each battery cluster 4, the positive output terminal 403 and negative output terminal 404 of the lithium battery are arranged on one side, and the positive output terminal 405 and negative output terminal 406 of the sodium battery are arranged on the other side. This layout makes the output lines of the battery cluster 4 clearer and neater, facilitating wiring and connection. At the same time, when connecting the battery cluster 4 to external circuits or performing maintenance and repairs on the battery cluster 4, it is easier to distinguish and operate the output lines of the lithium battery pack and the sodium battery pack, reducing the possibility of misoperation and improving operational convenience and safety. Specifically, the battery modules 2 of the battery cluster 4 can be arranged vertically, and the connection method can be referred to, for example... Figure 4 As shown in the image.

[0057] It should be noted that, referring to Figure 7 and Figure 8 As shown, based on the provision of multiple battery clusters 4, in some other exemplary embodiments, the battery cluster 4 includes a first high-voltage box connecting the positive output terminal 403 and the negative output terminal 404 of the lithium battery, and a second high-voltage box connecting the positive output terminal 405 and the negative output terminal 406 of the sodium battery. The connection component 3 includes a first DC bus module connecting each of the first high-voltage boxes, and a second DC bus module connecting each of the second high-voltage boxes. The connection component 3 connects to an external circuit through the first and second DC bus modules.

[0058] In this way, by connecting the first high-voltage box to the output terminal of the lithium battery pack and the second high-voltage box to the output terminal of the sodium battery pack, and by setting up a first DC combiner module and a second DC combiner module to connect to each high-voltage box before connecting to the external circuit, high-voltage transmission and combining of the DC power output from the battery pack is achieved. The DC-to-AC conversion can be realized through an external high-power energy storage converter. In practical implementation, multiple energy storage containers can use the same energy storage converter, simplifying the energy storage system using energy storage containers. The high-voltage boxes are mainly used for high-voltage side management and protection of the DC power output from battery cluster 4.

[0059] Based on the provision of a first DC combiner module and a second DC combiner module, in some exemplary embodiments, the connection component 3 includes a DC combiner cabinet 302, in which the first DC combiner module and the second DC combiner module are integrated. That is, the DC combiner cabinet 302 has two independent branches, allowing the current from the lithium iron phosphate cell 201 and the current from the sodium-ion cell 202 to be separately drawn out of the energy storage container.

[0060] This arrangement integrates the first and second DC combiner modules into the DC combiner cabinet 302, making the entire DC combiner system more compact and centralized, facilitating installation, commissioning, and maintenance. It also reduces the floor space, optimizes the internal space layout of the energy storage container, and enhances the overall integration and practicality of the energy storage container.

[0061] For example, continue to refer to Figure 7 and Figure 8 As shown, when two energy storage containers are used together, an integrated lithium-ion battery energy storage converter 5 and a sodium-ion battery energy storage converter 6 can be installed externally. The branch corresponding to the lithium iron phosphate battery cell 201 of the DC combiner cabinet 302 of each energy storage container is connected to the lithium-ion battery energy storage converter 5, and the branch corresponding to the sodium-ion battery cell 202 of the DC combiner cabinet 302 of each energy storage container is connected to the sodium-ion battery energy storage converter 6. The two energy storage containers can work with a set of integrated energy storage converters. The AC power output by the integrated energy storage converter is finally collected and connected to the external transformer 7.

[0062] It should be noted that the container 1 also includes a thermal management module 12 and a fire protection module 11. The thermal management module 12 includes a water chiller assembly and multiple liquid cooling plates. The water chiller assembly circulates coolant to the liquid cooling plates, which are used to cool the lithium iron phosphate battery cells 201 and sodium ion battery cells 202 inside the energy storage container. The lithium iron phosphate battery cells 201 and sodium ion battery cells 202 are bonded to the liquid cooling plates with thermally conductive adhesive.

[0063] Secondly, the fire protection module 11 mainly includes a fire detection sensor, an alarm, a fire extinguishing device, and a control system. The fire detection sensor can detect fire conditions, the alarm can provide audible and visual alarms, the fire extinguishing device can spray extinguishing agent, and the control system is used to trigger the fire extinguishing device based on the signal from the fire detection sensor and to trigger the alarm. For other specific structures of the fire protection module 11, refer to the existing related technologies for configuration methods; this embodiment will not elaborate further.

[0064] It is worth noting that, regarding the energy storage container of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still... Figures 1 to 6 As shown, it may include, for example, a housing 1, a battery module 2, and a connection assembly 3.

[0065] The battery module 2 includes a lithium iron phosphate cell 201 and a sodium-ion cell 202. Both are blade cells with a single-sided electrode post, and the lithium iron phosphate cell 201 and sodium-ion cell 202 are arranged alternately along the thickness direction.

[0066] Each lithium iron phosphate cell 201 is connected in series through a first overcurrent assembly 203, and each sodium ion cell 202 is connected in series through a second overcurrent assembly 204.

[0067] In this battery cluster 4, multiple battery modules 2 are vertically stacked to form a battery cluster 4. All lithium iron phosphate cells 201 in the battery cluster 4 are connected in series and are provided with a sodium battery positive output terminal 405 and a sodium battery negative output terminal 406. All sodium battery packs in the battery cluster 4 are connected in series and are provided with a sodium battery positive output terminal 405 and a sodium battery negative output terminal 406. The battery cluster 4 has multiple such cells.

[0068] The battery cluster 4 includes a first energy storage converter 401 that connects the positive output terminal 403 and the negative output terminal 404 of the lithium battery, and a second energy storage converter 402 that connects the positive output terminal 405 and the negative output terminal 406 of the sodium battery. The connection component 3 includes an AC combiner module that connects each of the first energy storage converters 401 and each of the second energy storage converters 402. The connection component 3 is connected to an external circuit through the AC combiner module.

[0069] In the preferred embodiment of the above energy storage container, the specific configuration and arrangement of the container body 1, battery module 2 and connecting component 3, etc., can still be referred to the description in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the container body 1, battery module 2 and connecting component 3, etc., can also be referred to the description in the above exemplary embodiments.

[0070] The energy storage container of this embodiment adopts the above design. By placing sodium-ion battery cells 202 between adjacent lithium iron phosphate battery cells 201, the sodium-ion battery cells 202 have a higher thermal runaway temperature and safety, which allows them to replace the insulation material and separate the adjacent lithium iron phosphate battery cells 201. This reduces production costs and improves energy density compared to energy storage containers that only use sodium-ion batteries. It also helps prevent the spread of thermal runaway, thus providing better safety and improving the stability of the energy storage container.

[0071] An embodiment of the second aspect of this application provides an energy storage system, which includes the energy storage container of the first aspect of this application.

[0072] The energy storage system of this embodiment adopts the energy storage container of the first aspect of this application. By placing the sodium-ion battery cell 202 in the battery module 2 between adjacent lithium iron phosphate battery cells 201, the sodium-ion battery cell 202 has a higher thermal runaway temperature and safety, which allows it to replace the heat insulation material and separate the adjacent lithium iron phosphate battery cells 201. While reducing production costs, it also increases energy density compared to energy storage containers that only use sodium-ion batteries, which helps prevent the spread of thermal runaway and thus has better safety. This also helps improve the stability of the energy storage container and improves the operational reliability of the energy storage system.

[0073] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. An energy storage container, characterized in that: It includes a housing, multiple battery modules disposed within the housing, and a connection component capable of connecting the battery modules to an external circuit. The battery module includes a plurality of lithium iron phosphate cells stacked sequentially along a preset direction, and at least one sodium-ion cell arranged between adjacent lithium iron phosphate cells.

2. The energy storage container according to claim 1, characterized in that: The battery module also includes a first current-passing component and a second current-passing component; The first overcurrent component is electrically connected to each of the lithium iron phosphate cells to form a lithium battery pack; The second overcurrent assembly electrically connects each of the sodium-ion cells to form a sodium battery pack.

3. The energy storage container according to claim 2, characterized in that: In the battery module, both the lithium iron phosphate cell and the sodium ion cell have single-sided terminals, and the terminals of the lithium iron phosphate cell and the sodium ion cell face opposite directions.

4. The energy storage container according to claim 3, characterized in that: The lithium iron phosphate battery cell is provided with a first explosion-proof valve at the end away from its own electrode post, and the sodium ion battery cell is provided with a second explosion-proof valve at the end away from its own electrode post.

5. The energy storage container according to any one of claims 2 to 4, characterized in that: It includes multiple battery clusters, each battery cluster comprising multiple battery modules stacked sequentially; In each of the battery clusters, each of the lithium battery packs is arranged in series and is provided with a lithium battery positive output terminal and a lithium battery negative output terminal, and each of the sodium battery packs is arranged in series and is provided with a sodium battery positive output terminal and a sodium battery negative output terminal.

6. The energy storage container according to claim 5, characterized in that: The battery cluster includes a first energy storage converter connected to the positive output terminal and the negative output terminal of the lithium battery, and a second energy storage converter connected to the positive output terminal and the negative output terminal of the sodium battery. The connection component includes an AC combiner module, which connects each of the first energy storage converters and each of the second energy storage converters. The connection component is connected to an external circuit through the AC combiner module.

7. The energy storage container according to claim 5, characterized in that: The battery cluster includes a first high-voltage box connecting the positive output terminal and the negative output terminal of the lithium battery, and a second high-voltage box connecting the positive output terminal and the negative output terminal of the sodium battery. The connection component includes a first DC combiner module connecting each first high-voltage box and a second DC combiner module connecting each second high-voltage box. The connection component is connected to an external circuit through the first DC combiner module and the second DC combiner module.

8. The energy storage container according to claim 7, characterized in that: The connection assembly includes a DC combiner cabinet, in which the first DC combiner module and the second DC combiner module are integrated.

9. The energy storage container according to claim 5, characterized in that: In each of the battery clusters, the positive output terminal and the negative output terminal of the lithium battery are arranged on one side, and the positive output terminal and the negative output terminal of the sodium battery are arranged on the other side.

10. An energy storage system, characterized in that: The energy storage system includes the energy storage container as described in any one of claims 1 to 9.

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