Battery device, energy storage device, energy storage system, and charging network

Abstract

The application relates to the battery technical field and provides a battery device, an energy storage device, an energy storage system and a charging network. The battery device comprises a box body, a battery assembly, a liquid medium and a heat exchange mechanism. The box body comprises multiple wall bodies, the multiple wall bodies are arranged to form a containing cavity, at least one wall body has a double-cavity structure, the double-cavity structure is a vacuum structure; the battery assembly comprises multiple battery monomers, the battery assembly is arranged in the containing cavity; the liquid medium is arranged in the containing cavity to immerse the battery assembly; and the heat exchange mechanism is arranged in the box body to perform heat exchange on the liquid medium. The battery assembly is immersed by the liquid medium, the heat dissipation area is increased, the overall temperature in the box body is more balanced, the charging and discharging consistency of the battery device is higher, and the available power can be improved. The wall body has the double-cavity structure, the heat conduction efficiency can be reduced, the isolation effect of the internal space of the box body and the external environment can be improved, the influence of the external environment temperature on the temperature change of the battery device can be reduced, and the heat preservation performance is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, energy storage device, energy storage system, and charging network. Background Technology

[0002] In related technologies, the battery cells are located in the casing, which results in poor thermal management of the casing. Utility Model Content

[0003] In view of this, embodiments of this application provide a battery device, an energy storage device, an energy storage system, and a charging network that can improve thermal management performance.

[0004] The technical solution of this application embodiment is implemented as follows: This application provides a battery device, including: The box includes multiple walls that enclose a cavity, and at least one of the walls has a double-layer cavity structure, wherein the double-layer cavity structure is a vacuum structure. A battery assembly, comprising multiple individual battery cells, is disposed within the receiving cavity; A liquid medium is disposed in the receiving cavity to immerse the battery assembly; A heat exchange mechanism is provided in the housing to exchange heat with the liquid medium.

[0005] Immersing the battery components in a liquid medium increases the heat dissipation area, resulting in a more uniform overall temperature inside the enclosure. This leads to higher consistency in battery charging and discharging, increasing usable capacity. Furthermore, it eliminates the need for water-cooled plates and fire suppression components, reducing battery production costs and increasing energy density. The enclosure's walls feature a double-cavity structure, reducing thermal conductivity and improving insulation by isolating the internal space from the external environment, minimizing the impact of external temperature variations on battery temperature. Vacuuming the double-cavity structure further reduces its thermal conductivity, enhancing insulation performance.

[0006] In some embodiments, the housing includes: Base frame; At least one sidewall is fixedly connected to the bottom frame to enclose and form a groove structure with an open end; The cover is detachably connected to the side wall to seal the opening end of the groove structure; The bottom frame, the side walls, and the cover are all walls, and each wall has the double-layer cavity structure.

[0007] This design facilitates the removal and installation of the cover, and the opening or closing of the receiving cavity for the installation of components such as battery packs, or for subsequent maintenance. It also reduces the thermal conductivity of each wall section, further improving insulation performance.

[0008] In some embodiments, the number of sidewalls is four, and the cross-sectional profile of the groove structure is rectangular.

[0009] In some embodiments, the housing further includes: A first limiting member is disposed on the bottom frame and / or side wall to limit the battery assembly, thereby spacing the battery assembly from at least one of the side walls.

[0010] This allows for a gap between the battery assembly and the sidewall, enabling the liquid medium to fill the space between the battery assembly and the sidewall.

[0011] In some embodiments, the first limiting member is provided for each of the sidewalls to space the battery assembly from each of the sidewalls.

[0012] This allows for gaps between the battery module and each sidewall, ensuring that the battery module is completely surrounded by a liquid medium, thus improving the thermal management efficiency of the liquid medium for the battery module.

[0013] In some embodiments, the first limiting member has a guide surface to guide the battery assembly disposed in the receiving cavity.

[0014] By setting guide surfaces, the installation of battery components can be guided, making it easier for the battery components to be installed in place.

[0015] In some embodiments, the housing further includes: A sealing gasket is disposed between the cover and the side wall; Fasteners are fastened to the cover and the sidewall.

[0016] The cover and sidewall are fixedly connected by fasteners, and a sealing gasket is pressed between the cover and the sidewall to achieve a sealed connection and improve the overall sealing effect after connection.

[0017] In some embodiments, the battery assembly includes a pillar and stacked multi-layer battery modules, each battery module comprising multiple individual battery cells, with each layer of the battery module locked to the pillar.

[0018] The multi-layer battery modules are connected to form a whole by using columns.

[0019] In some embodiments, a plurality of battery cells are arranged along a first direction to form a battery cell assembly, and a plurality of battery cell assemblies are arranged along a second direction. The terminals of the battery cells are arranged along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. The battery module further includes: End plates are provided on the outer periphery of the plurality of battery cell assemblies along the first direction and the second direction, and the end plates are locked to the column; A support member is disposed on the shoulder of a plurality of battery cells along the first direction, and the two ends of the support member are respectively connected to the corresponding end plates; A spacer is disposed between two adjacent battery cells in the battery module.

[0020] Thus, the support member, acting as a spacer structure, separates two adjacent battery cells along a third direction, allowing the liquid medium to enter between them. The support member also supports the battery cells above it. Spacers are placed between adjacent battery cells on the same layer. These spacers act as separators, allowing the liquid medium to enter between the two battery cells for thermal management. The support member is connected to the end plates, forming a fixed whole for the battery modules. The end plates are locked to the columns, and the two ends of the support members are connected to their respective end plates, forming an integral frame that connects the battery modules of each layer to form a battery assembly, which in turn forms a fixed whole.

[0021] In some embodiments, two adjacent battery cells in each layer of the battery module share one support member.

[0022] This reduces the number of support components and facilitates assembly and disassembly. It also helps to limit the movement of adjacent battery cells, ensuring that the end faces of the two battery cells are flush.

[0023] In some embodiments, the separator has a slot and a liquid passage chamber to allow the liquid medium to flow from the slot into the liquid passage chamber and come into contact with the surface of the battery cell.

[0024] Thus, the spacer should function to separate adjacent battery cells without covering the entire surface. The shape of the slot is not limited, as long as it allows the liquid medium to flow.

[0025] In some embodiments, the septum includes an isolation portion that surrounds the fluid passage cavity, and the slot is located in the isolation portion.

[0026] The structure or location of the slotted opening in the isolation section can vary.

[0027] In some embodiments, the spacer includes spaced first spacers, with the slot and the liquid passage cavity formed between two adjacent first spacers, the slot being located at both ends of the liquid passage cavity.

[0028] Thus, setting the first separator helps to reduce the area of ​​the separator, which in turn helps to reduce the side area of ​​the covered battery cells and improve thermal management.

[0029] In some embodiments, the septum includes a continuously extending second spacer that winds around in a plane from a starting end to form a multi-layered coiled body. The second spacer has gaps between adjacent layers, which form the fluid passage cavity. The slot is located in the gap between the starting end and the adjacent layer, and the slot is located on the second spacer.

[0030] Thus, setting a second spacer reduces the number of parts and facilitates the installation of spacers.

[0031] In some embodiments, the septum includes a mesh, the mesh space of which forms the fluid passage cavity, and the slot is located in the mesh so that each mesh can form a passage.

[0032] Therefore, setting up a separator helps to make the liquid medium contact the sides of the battery cells more evenly.

[0033] In some embodiments, the spacer extends through the plurality of battery cell assemblies along the second direction.

[0034] In other words, the separators corresponding to two adjacent battery cells along the second direction in the battery module are connected to form a continuous integral component. This reduces the total number of separators and the number of components in the battery device.

[0035] In some embodiments, each of the battery cells is provided with one separator along the second direction.

[0036] In other words, the separators for two adjacent battery cells along the second direction in the battery module are set separately.

[0037] In some embodiments, the spacer extends through the battery cell assembly along the first direction.

[0038] In other words, the separators corresponding to two adjacent battery cells along the first direction in the battery module are connected to form a continuous integral component. This reduces the total number of separators and the number of components in the battery device.

[0039] In some embodiments, each of the battery cells is provided with a spacer along the first direction.

[0040] In other words, the separators for two adjacent battery cells along the first direction in the battery module are set separately.

[0041] In some embodiments, the battery device further includes a liquid level sensor disposed in the housing and located in the containment cavity to detect the position of the liquid medium.

[0042] Liquid level control is achieved by acquiring the position of the liquid medium. If the liquid level is lower than the preset position, an alert signal will be issued so that the liquid medium can be replenished in time.

[0043] In some embodiments, the battery device further includes a temperature sensor disposed in the housing and located in the receiving cavity to detect the temperature within the receiving cavity.

[0044] Temperature control of the cavity can be achieved by acquiring the temperature inside the cavity. For example, if the temperature inside the cavity is higher than a preset temperature, an alert signal will be issued to activate the heat exchange mechanism.

[0045] In some embodiments, the battery device further includes a heating device disposed in the housing and located in the receiving cavity to heat the liquid medium.

[0046] A heating device is used to provide heat to raise the temperature of a liquid medium. As an example, the heating device includes a heating wire disposed between the battery assembly and the wall.

[0047] In some embodiments, the battery device further includes a pressure relief valve disposed in the housing to relieve pressure in the receiving cavity.

[0048] Thus, the pressure relief valve can release pressure when the internal pressure of the containment chamber exceeds a safe threshold, reducing the risk of deflagration. As an example, please refer to the figure; the housing has a pressure relief port, and the pressure relief valve is located at the pressure relief port.

[0049] In some embodiments, the heat exchange mechanism includes: The inlet pipe is connected to the receiving cavity; The liquid outlet pipe is connected to the receiving cavity; A heat exchanger is disposed on the outside of the housing, and the heat exchanger is connected to the inlet pipe and the outlet pipe respectively; A fan is installed on the outside of the housing or on the heat exchanger to dissipate heat from the heat exchanger.

[0050] Liquid media enter the heat exchanger, enabling thermal management. The radiator cools the heat exchanger, thereby cooling the liquid media. The fan further cools the heat exchanger, improving its heat dissipation efficiency. The heat exchanger and fan do not occupy housing space, reducing the required enclosure size and simplifying the internal structure. Their external location facilitates disassembly and maintenance.

[0051] In some embodiments, the inlet pipe and the outlet pipe are respectively connected to opposite sides of the receiving cavity.

[0052] This allows the liquid medium within the cavity to circulate, extending the flow path of the liquid medium and improving heat exchange efficiency.

[0053] This application also provides an energy storage device, including: The battery device described in any one of the embodiments of this application is used to store or provide electrical energy.

[0054] In some embodiments, the energy storage device is configured as an energy storage container or an energy storage cabinet.

[0055] This application also provides an energy storage system, including: The energy storage device described in the embodiments of this application; An energy storage converter is electrically connected to the energy storage device and the power generation device.

[0056] This application also provides a charging network, including: Charging stations; The energy storage device described in this application embodiment is electrically connected to the charging pile and is used to provide electrical energy.

[0057] The embodiments of this application have the following beneficial effects: The battery device, energy storage device, energy storage system, and charging network provided in this application embodiment increase the heat dissipation area by immersing the battery components in a liquid medium, resulting in a more uniform overall temperature inside the enclosure, higher charging and discharging consistency of the battery device, increased usable power, and the elimination of water-cooling plates and fire-fighting components, reducing battery device production costs and increasing energy density. The enclosure wall has a double-cavity structure, which reduces the thermal conductivity of the wall, improves the isolation between the internal space of the enclosure and the external environment, reduces the impact of external ambient temperature on the temperature changes of the battery device, and improves thermal insulation performance. Vacuuming the cavity of the double-cavity structure further reduces its thermal conductivity and improves thermal insulation performance. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the charging network structure in one embodiment of this application; Figure 2 This is a schematic diagram of the energy storage system and power grid in one embodiment of this application; Figure 3 This is a schematic diagram of the structure of a battery device according to an embodiment of this application; Figure 4 for Figure 3 The right view; Figure 5 for Figure 3 The left view; Figure 6 for Figure 3 Rear view; Figure 7 This is a schematic diagram of the structure of the box in one embodiment of this application; Figure 8 for Figure 7 Top view; Figure 9 for Figure 5 A schematic diagram of the cross-sectional structure of aa; Figure 10 for Figure 9 Enlarged view of point A; Figure 11 for Figure 9 Enlarged view of point B; Figure 12 for Figure 3 A schematic diagram of the cross-sectional structure of bb; Figure 13 for Figure 12 Enlarged diagram at point C Figure 14 This is a schematic diagram of the separator and battery cell in the first embodiment of this application; Figure 15 This is a schematic diagram of the separator and battery cell in the second embodiment of this application; Figure 16 This is a schematic diagram of the separator and battery cell in the third embodiment of this application; Figure 17 This is a schematic diagram of the separator and battery cell in the fourth embodiment of this application; Figure 18 This is a schematic diagram of the separator and battery cell in the fifth embodiment of this application.

[0059] Explanation of reference numerals in the attached figures 100. Battery assembly; 10. Housing; 10a. Receiving cavity; 10b. Pressure relief port; 101. Wall; 11. Base frame; 12. Side wall; 13. Cover; 14. First limiting component; 141. Guide surface; 15. Sealing gasket; 16. Fastener; 102. Heat insulation component; 20. Battery assembly; 201. Battery module; 202. Battery cell assembly; 21. Battery cell; 211. Shoulder; 22. Column; 23. End plate; 24. Support component; 25. Divider; 25a. Slot; 25b. Liquid passage cavity; 251. 252. First isolation section; 253. Second isolation section; 254. Second partition bar; 30. Heat exchange mechanism; 31. Liquid inlet pipe; 32. Liquid outlet pipe; 33. Heat exchanger; 34. Fan; 40. Liquid level sensor; 50. Temperature sensor; 60. Heating device; 70. Electrical connector; 2000. Energy storage system; 1000. Charging network; 200. Energy storage device; 300. Charging pile; 400. Energy storage converter; 3000. Power generation device; L. Liquid medium; X. First direction; Y. Second direction; Z. Third direction. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0062] It should be noted that in the embodiments of this application, the orientations or positional relationships such as "first direction," "second direction," and "third direction" are based on the orientations or positional relationships shown in the accompanying drawings. It should be understood that these orientational terms 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; therefore, they should not be construed as limitations on this application. The application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0064] In the description of this specification, references to terms such as "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of those different embodiments or examples.

[0065] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0066] The following is a detailed description of this application.

[0067] In related technologies, the battery cells are located in the casing, which results in poor thermal management of the casing.

[0068] In view of this, embodiments of this application provide a battery device that can improve thermal management performance. The battery device can be applied to energy storage devices or to electrical appliances, such as vehicles.

[0069] This application also provides an energy storage device, which includes a battery device according to any embodiment of this application. The battery device is used to store or provide electrical energy.

[0070] Please refer to Figure 1 and Figure 2 This application also provides a charging network 1000, which includes a charging pile 300 for charging electrical equipment. The charging network 1000 may also include an energy storage device 200 according to any embodiment of this application. The energy storage device 200 is electrically connected to the charging pile 300 and is used to provide power to the charging pile 300.

[0071] The charging pile 300 is electrically connected to the battery cells in the energy storage device 200 via cables. The battery cells can supply their stored electrical energy to the charging pile 300. The charging pile 300 has a connector that can connect to electrical equipment, thereby replenishing the equipment's power. The application of the energy storage device 200 in this charging network 1000 can effectively improve the safety of the charging network 1000 and also help to enhance the flexibility of the charging network 1000 during deployment.

[0072] In a charging network 1000, there can be one charging pile 300, and the energy storage device 200 provides power to the one charging pile 300; there can also be multiple charging piles 300, and the energy storage device 200 provides power to multiple charging piles 300.

[0073] As an example, such as Figure 1 As shown, the charging network 1000 includes an energy storage device 200 and two charging piles 300, with the energy storage device 200 providing power to the two charging piles 300.

[0074] The energy storage device 200 includes a battery device that is electrically connected to the charging pile 300 so that the battery device can provide power to the charging pile 300.

[0075] The battery assembly includes a housing and individual battery cells, with the individual cells housed within the housing. The housing provides space for the individual battery cells and can employ various structures.

[0076] In a battery device, there can be multiple battery cells, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of these battery cells is housed within a casing. Alternatively, the battery device can consist of multiple battery cells first connected in series, parallel, or a combination thereof to form battery modules, and then these modules are connected in series, parallel, or a combination thereof to form a whole, which is also housed within a casing. The battery device may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells.

[0077] As an example, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this.

[0078] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The positive electrode can be a positive electrode sheet, the negative electrode can be a negative electrode sheet, and the separator is located between the positive and negative electrodes. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0079] In some embodiments, the positive electrode sheet may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0080] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0081] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3O2(Also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM1), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1O2 (Also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0083] In some embodiments, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0084] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0085] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0086] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0087] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0088] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0089] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0090] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0091] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0092] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0093] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0094] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0095] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0096] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0097] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0098] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal in shape. This application uses an example where the electrode assembly is approximately cuboid.

[0099] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0100] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0101] In some embodiments, the housing includes an end cap and a housing body, the housing body having an opening, and the end cap covering the opening. The housing body may have one or more openings. The end cap may also have one or more.

[0102] Please see Figure 2 This application also provides an energy storage system 2000, which includes an energy storage converter 400. The energy storage converter 400 can be electrically connected to a power generation device 3000 to convert the electrical power provided by the power generation device 3000. The energy storage system 2000 may also include an energy storage device 200 according to any embodiment of this application. The energy storage device 200 is electrically connected to the energy storage converter 400, and the energy storage converter 400 converts the electrical energy provided by the power generation device 3000 and stores it in the energy storage device 200.

[0103] A power conversion device is used to connect the power generation device 3000 and the energy storage device 200. The power generation device 3000 generates electrical energy and stores it in the energy storage device 200 via the power conversion device. The use of the energy storage device 200 in the energy storage system 2000 effectively improves its operational safety. In specific implementations, the power generation equipment can be solar panels, hydroelectric power generation equipment, thermal power generation equipment, etc. This application does not limit the specific type of power generation equipment.

[0104] As an example, such as Figure 2 As shown, the energy storage system 2000 includes an energy storage device 200 and an energy storage converter 400. The two power generation devices 3000 respectively transmit the generated electrical energy to the energy storage converter 400, and the energy storage converter 400 introduces the electrical energy into the energy storage device 200 for storage.

[0105] As an example, the energy storage device 200 is configured as an energy storage container or an energy storage cabinet, etc.

[0106] As an example, energy storage device 200 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage power stations can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Wind power generation systems collect wind energy from wind turbines, convert it into electrical energy, and store it in energy storage device 200. Solar power generation systems can convert solar energy into electrical energy, store it in energy storage device 200, and supply it to users as needed. Mobile power systems can supply power to relevant electrical equipment in areas where the mains power supply cannot reach, such as remote mountainous areas and remote wilderness areas. Temporary power supply systems can provide power to users when there is insufficient power supply.

[0107] Please see Figures 3 to 9 The battery device 100 includes a housing 10, a battery assembly 20, a liquid medium L, and a heat exchange mechanism 30. The housing 10 includes multiple walls 101, which enclose a receiving cavity 10a, and at least one wall 101 has a double-layer cavity structure. The battery assembly 20 includes multiple battery cells 21, and the battery assembly 20 is disposed in the receiving cavity 10a. The liquid medium L is disposed in the receiving cavity 10a to immerse the battery assembly 20. The heat exchange mechanism 30 is disposed in the housing 10 to exchange heat with the liquid medium L.

[0108] As an example, battery cells 21 are stacked to form a battery assembly 20, which can be assembled and disassembled as a whole from the housing 10. Alternatively, battery cells 21 are stacked on the housing 10 to form the battery assembly 20.

[0109] As an example, the battery cell 21 includes a housing and an electrode assembly, with the electrode post of the electrode assembly protruding from the end face of the housing.

[0110] As an example, the housing has multiple shell walls that enclose a receiving space within the housing, where the electrode assembly is disposed. End faces and side faces are formed within the multiple shell walls. An end face refers to the surface of the shell wall where the electrode post or pressure relief valve is located; for example, two shell walls may be positioned opposite each other to form two end faces.

[0111] Sides are formed in multiple shell walls, and the side refers to the peripheral shell wall of the battery cell 21.

[0112] As an example, the battery cell 21 is a prismatic battery cell, with a shape approximately similar to a cuboid. In this way, the shape of the battery cell 21 is relatively regular, which can improve space utilization, help increase the energy density of the battery device 100, and facilitate the arrangement of multiple battery cells 21 along the first direction X, as well as along the second direction Y.

[0113] As an example, the battery cell 21 has six shell walls. Two of the shell walls of the battery cell 21 are arranged opposite each other along a first direction X to form two side surfaces. Another two shell walls of the battery cell 21 are arranged opposite each other along a second direction Y to form another two side surfaces. Two shell walls are arranged opposite each other along a third direction Z to form two end faces of the battery cell 21. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other, and the third direction Z is in the same direction as the height of the battery cell 21. The side surface with the larger area can also be referred to as the large surface.

[0114] As an example, the battery cell 21 includes two terminals. For instance, the two terminals are disposed on the same end face of the battery cell 21. In other embodiments, the two terminals are disposed on opposite end faces of the battery cell 21.

[0115] The housing 10 provides a receiving cavity 10a to accommodate the battery cell 21. The shape of the housing 10 is not limited and can be configured as needed. In some embodiments, the housing 10 is approximately cuboid in shape and includes six walls 101. In other embodiments, the housing 10 includes other numbers of walls 101, each wall 101 enclosing the receiving cavity 10a, such as a cylinder.

[0116] A double-layer cavity structure refers to a structure where the wall 101 has an inner wall and an outer wall, thus forming a double-layer structure. An interlayer cavity is formed between the inner and outer walls, resulting in the double-layer cavity structure. As an example, both the inner and outer walls are metal plates, such as steel plates. Steel plates have high structural strength, which can improve the load-bearing capacity of the enclosure 10.

[0117] At least one wall 101 has a double-layer cavity structure. Specifically, each wall 101 may have a double-layer cavity structure, or only one wall 101 may have a double-layer cavity structure, or any number of the walls 101 may have a double-layer cavity structure.

[0118] As an example, the double-cavity structure is a vacuum structure. The interior of the double-cavity structure is evacuated to a vacuum state to reduce its thermal conductivity and improve its insulation performance.

[0119] As an example, combined Figure 10 The housing 10 also includes a heat insulation element 102, which is filled within the double-layer cavity structure. By filling the cavity of the double-layer cavity structure with the heat insulation element 102, the thermal conductivity of the double-layer cavity structure is reduced, thereby improving the thermal insulation performance. The heat insulation element 102 can be made of a material with low thermal conductivity, such as rock wool or aerogel. As an example, the heat insulation element 102 includes a first heat insulation layer, which is made of rock wool. Alternatively, the heat insulation element 102 includes a second heat insulation layer, which is made of aerogel. Alternatively, the heat insulation element 102 includes a first heat insulation layer and a second heat insulation layer stacked together, where the first heat insulation layer is made of rock wool and the second heat insulation layer is made of aerogel.

[0120] As an example, two adjacent wall sections 101 are joined by welding to increase the connection strength; for example, see [link to relevant documentation]. Figure 9 The housing 10 includes side walls 12, which are walls 101. The ends of two adjacent side walls 12 are fixedly connected, for example by welding, which can improve the connection strength. For example, the housing 10 includes one, two, three or four side walls 12.

[0121] For example, please refer to Figure 9 The housing 10 also includes a bottom frame 11 and a cover 13. Both the bottom frame 11 and the cover 13 are walls 101. Each side wall 12 is fixedly connected to the bottom frame 11 to enclose and form a groove structure with an open end. For example, welding can be used to improve the connection strength. The cover 13 is detachably connected to the side walls 12 to close the open end of the groove structure. This facilitates the removal and installation of the cover 13, opening or closing the receiving cavity 10a for the installation of components such as the battery assembly 20, or for later maintenance.

[0122] As an example, the cross-sectional profile of the trough structure is circular or square.

[0123] For example, please refer to Figure 9 The enclosure 10 includes a base frame 11, four side walls 12, and a cover 13. The four side walls 12 are fixedly connected to the base frame 11 to form a groove structure with open ends; the cover 13 is detachably connected to the side walls 12 to close the open ends of the groove structure; wherein, the base frame 11, side walls 12, and cover 13 are all walls 101, and each wall 101 has a double-layer cavity structure. In this way, the thermal conductivity of each wall 101 can be reduced, further improving the heat preservation effect.

[0124] As an example, the cross-sectional profile of the trough structure is rectangular.

[0125] As an example, the side wall 12 and the cover 13 are connected by a highly sealed connection, which can meet the sealing level of IP67 and above to meet the airtightness and safety requirements during transportation and use.

[0126] In some embodiments, please refer to Figure 10 The housing 10 also includes a sealing gasket 15 and a fastener 16. The sealing gasket 15 is disposed between the cover 13 and the side wall 12; the fastener 16 is fastened to the cover 13 and the side wall 12. The cover 13 and the side wall 12 are fixedly connected by the fastener 16, and the sealing gasket 15 is pressed between the cover 13 and the side wall 12, so that a sealed connection can be achieved between the cover 13 and the side wall 12, improving the overall sealing effect after connection.

[0127] As an example, fastener 16 is a bolt, which is low in cost and easy to install and remove.

[0128] As an example, the sealing gasket 15 can be set as a rubber sealing gasket, which is resistant to high and low temperatures, corrosion-resistant, and has good insulation properties.

[0129] As an example, the sealing gasket 15 can be set as a foam sealing gasket, which has a large compression capacity and good adaptability to structural shape.

[0130] As an example, the sealing gasket 15 can be set as a composite sealing gasket, such as a composite material of rubber and skeleton, or a composite material of rubber and glass fiber, which has high structural strength and strong resistance to deformation.

[0131] The liquid medium L serves as insulation and thermal conductivity. Simultaneously, the liquid medium L enables rapid thermal management of the individual battery cells 21, for example, by cooling the battery assembly 20 to lower its temperature or heating it to raise its temperature, thereby achieving precise temperature control of the individual battery cells 21, resulting in a more uniform temperature across all cells and increasing the usable power of the battery device 100. The liquid medium L can be perfluorohexanone (PFHxK), perfluorocarbons (PFCs), hydrofluoroolefins (HFOs), or high-purity mineral oil, etc.

[0132] The heat exchange mechanism 30 is used for thermal management of the liquid medium L, so that the liquid medium L can thermally manage the battery assembly 20. The heat exchange mechanism 30 can be disposed on the outside of the housing 10, for example, on the side wall 12 of the housing 10.

[0133] In some embodiments, please refer to Figure 10 The battery device 100 also includes a temperature sensor 50, which is disposed in the housing 10 and located in the receiving cavity 10a to detect the temperature inside the receiving cavity 10a. By obtaining the temperature inside the receiving cavity 10a, temperature control of the receiving cavity 10a can be achieved. For example, when the temperature inside the receiving cavity 10a is higher than a preset temperature, an alert signal will be issued to activate the heat exchange mechanism 30.

[0134] In some embodiments, please refer to Figure 10 The battery device 100 also includes a liquid level sensor 40, which is disposed in the housing 10 and located in the receiving cavity 10a to detect the position of the liquid medium L. Liquid level control is achieved by obtaining the position of the liquid medium L. If the liquid level of the liquid medium L is lower than a preset position, an alarm signal will be issued so that the liquid medium L can be replenished in time.

[0135] In some embodiments, please refer to Figure 9 The heat exchange mechanism 30 includes an inlet pipe 31, an outlet pipe 32, and a heat exchanger 33. The inlet pipe 31 is connected to the receiving cavity 10a; the outlet pipe 32 is connected to the receiving cavity 10a; the heat exchanger 33 is located on the outside of the housing 10 and is connected to the inlet pipe 31 and the outlet pipe 32 respectively.

[0136] In this way, the liquid medium L enters the heat exchanger 33, which can cool the liquid medium L and achieve thermal management.

[0137] Furthermore, the heat exchange mechanism 30 also includes a fan 34, which is used to dissipate heat from the heat exchanger 33. The fan 34 can cool the heat exchanger 33 to improve its heat dissipation efficiency.

[0138] As an example, fan 34 is located on the outside of housing 10. Alternatively, fan 34 is located on heat exchanger 33.

[0139] In this way, the heat exchanger 33 and the fan 34 will not occupy the space of the housing cavity 10a, which can reduce the required size of the housing 10, making the internal structure of the housing 10 simpler, and the external location makes it easy to disassemble and maintain.

[0140] As an example, heat exchanger 33 is a finned heat exchanger, which has high heat exchange efficiency and small size, which is conducive to the compact layout of battery device 100.

[0141] In some embodiments, please refer to Figure 9 The inlet pipe 31 and the outlet pipe 32 are respectively connected to opposite sides of the receiving cavity 10a. In this way, the liquid medium L in the receiving cavity 10a can circulate, the flow path of the liquid medium L can be extended, and the heat exchange efficiency can be improved.

[0142] Furthermore, the housing 10 also includes a fastener, which is disposed on the wall 101 and is used to fix the liquid inlet pipe 31.

[0143] In some embodiments, please refer to Figure 12 The battery assembly 100 also includes a heating device 60 disposed in the housing 10 and located in the receiving cavity 10a for heating the liquid medium L. The heating device 60 is used to provide heat to raise the temperature of the liquid medium L. As an example, the heating device 60 includes a heating wire disposed between the battery assembly 20 and the wall 101.

[0144] Liquid medium L enters the receiving cavity 10a from outside the housing 10. The heating device 60 heats the liquid medium L in a timely manner, which helps the individual battery cells 21 to quickly achieve temperature equilibrium. In this way, when the external temperature is low, the heating device 60 can be used to heat the liquid medium L, so that the temperature inside the receiving cavity 10a is always within a suitable charging and discharging temperature range, thereby improving the low-temperature adaptability and service life of the battery device 100.

[0145] In some embodiments, the heat exchange mechanism 30 further includes a pump body for driving the liquid medium L to circulate.

[0146] In some embodiments, the battery device 100 includes a battery management system disposed in the housing 10. The battery management system is used to monitor and control the operating status of the battery device 100, including monitoring parameters such as voltage, current, and temperature of each individual battery cell 21, and to estimate parameters such as state of charge (SOC) and state of health (SOH).

[0147] In some embodiments, the heat exchange mechanism 30 is controlled by a temperature sensor 50 and a battery management system. A fan 34 cools the heat exchanger 33, which in turn cools the liquid medium L. The cooled liquid medium L then enters the receiving cavity 10a through the inlet pipe 31. A heating device 60 heats the liquid medium L; the fan 34 is not operating while the heating device 60 is running. The liquid medium L circulates under the action of the pump, allowing the temperature of each battery cell 21 to quickly equalize.

[0148] In some embodiments, the battery device 100 also includes a pressure relief valve disposed in the housing 10 to relieve pressure in the receiving cavity 10a. The pressure relief valve allows for pressure relief when the pressure inside the receiving cavity 10a exceeds a safe threshold, reducing the risk of deflagration. For example, please refer to... Figure 8 The housing 10 has a pressure relief port 10b, and a pressure relief valve is located at the pressure relief port 10b.

[0149] In some embodiments, please refer to Figure 6 The battery device 100 also includes an electrical connector 70 disposed on the outside of the housing 10. Used for transmitting power and signals, the electrical connector 70 includes, for example, a high-voltage connector and a low-voltage connector. As an example, the electrical connector 70 is disposed at the upper end of the side wall 12.

[0150] As an example, electrical connector 70 has a wire harness for connecting to an external device. As an example, the wire harness is configured with a quick-connect interface, enabling rapid connection or disconnection with an external device.

[0151] As an example, the wiring harness is configured with a sealed structure to enable a sealed connection between the quick-connect interface and an external device.

[0152] The battery device 100, energy storage device, energy storage system 2000, and charging network 1000 provided in this application embodiment have a double-layer cavity structure in the wall 101 of the housing 10, which can reduce the thermal conductivity of the wall 101, improve the isolation effect between the internal space of the housing 10 and the external environment, reduce the influence of the external environment temperature on the temperature change of the battery device 100, and improve the heat preservation performance.

[0153] In this embodiment, immersing the battery assembly 20 in liquid medium L increases the heat dissipation area, makes the overall temperature inside the housing 10 more uniform, improves the charging and discharging consistency of the battery device 100, increases the available power, and eliminates the need for a water cooling plate, thus reducing the production cost of the battery device 100.

[0154] When a battery cell 21 experiences thermal runaway, the liquid medium L can rapidly cool the battery cell 21, preventing heat from spreading to other battery cells 21. This eliminates the need for fire-fighting components and other fire-resistant structures. Fire-fighting components are space-consuming, costly, and difficult to obtain. Eliminating these fire-fighting components in this application further reduces costs and increases the energy density of the battery device 100. Furthermore, since the battery cell 21 is in direct contact with the liquid medium L, the heat exchange efficiency is high, reducing the need for cooling the liquid medium L. Thus, the liquid medium L can be cooled via a heat exchanger, eliminating the need for a refrigeration unit. Refrigeration units are costly, bulky, difficult to maintain, have low heating efficiency, low energy conversion rate, and high energy consumption. Eliminating the refrigeration unit in this application reduces costs, decreases space requirements, and increases energy density.

[0155] Furthermore, when the battery cells 21 in the battery assembly 20 are set to be multi-layered stacked, the bottom battery cell 21 bears a large load, which affects the service life of the battery device 100 and increases the risk of failure. In this application, the battery assembly 20 is immersed in liquid medium L, which can reduce the load on the bottom cells and reduce the risk of structural failure due to the gravity of the upper layer.

[0156] In some embodiments, please refer to Figure 9 The battery assembly 20 includes a stacked multi-layer battery module 201, and the battery module 201 includes a plurality of battery cells 21.

[0157] Furthermore, combined Figure 10 or Figure 12 The battery assembly 20 includes a column 22, and each layer of battery module 201 is attached to the column 22. The multiple layers of battery modules 201 are connected to form a whole through the column 22.

[0158] In some embodiments, please refer to Figure 9 The battery module 201 includes multiple battery cells 21, which are arranged along a first direction X to form a battery cell assembly 202. The multiple battery cell assemblies 202 are arranged along a second direction Y, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0159] It should be noted that the battery cell module 202 is only a feature division for the purpose of illustrating the scheme and should not be construed as a limitation on the structural form. That is to say, the battery cell module 202 can be assembled as a whole or it can be assembled separately.

[0160] In some embodiments, adjacent battery cells 21 are spaced apart to allow the liquid medium L to enter between the two battery cells 21 for thermal management. As an example, a spacer structure is provided between adjacent battery cells 21, and the spacer structure can be configured in various ways to meet other requirements.

[0161] As an example, the battery cell 21 is a prismatic battery cell, with the large surfaces of two adjacent battery cells 21 spaced apart, and the sides of two adjacent battery cells 21 can be spaced apart or not spaced apart.

[0162] For example, please refer to Figure 10 and Figure 11 The battery module 201 also includes a separator 25, which is disposed between two adjacent battery cells 21 in the battery module 201. That is, a separator 25 is disposed between two adjacent battery cells 21 in the same layer. The separator 25 can serve as a separator, allowing the liquid medium L to enter between the two battery cells 21 for thermal management.

[0163] As an example, the separator 25 includes a buffer layer that can absorb stress through its own deformation when the battery cell 21 undergoes thermal expansion or mechanical vibration. Furthermore, the buffer layer can be made of a material with a certain degree of elasticity and low thermal conductivity, such as polyurethane foam or silicone foam.

[0164] As an example, the separator 25 includes a heat insulation layer that can delay or reduce heat conduction between adjacent battery cells 21, thereby reducing the risk of mutual influence between adjacent battery cells 21 due to heat conduction. For example, it reduces the risk that overheating or undercooling of one battery cell 21 may affect the normal operation of the adjacent battery cell 21.

[0165] Furthermore, the insulation layer can be made of insulation materials, such as single materials like glass fiber, polycrystalline silicon, nano-silicon, nano-carbon fiber, and aerogel, or a mixture of multiple materials with insulation functions.

[0166] In some embodiments, the spacer 25 includes a stacked buffer layer and a heat insulation layer; the buffer layer and the heat insulation layer are integrally formed. This reduces the number of parts and assembly steps.

[0167] Understandably, the separator 25 will not completely cover the surface of the battery cell 21 so that the liquid medium L can contact the surface of the battery cell 21 for thermal management.

[0168] The way the liquid medium L flows through the separator 25 can be set in various ways, as long as it can serve to separate two adjacent battery cells 21 without covering the entire surface.

[0169] In some embodiments, please refer to Figures 14 to 18 The separator 25 has a slot 25a and a liquid passage chamber 25b, so that the liquid medium L can flow from the slot 25a into the liquid passage chamber 25b and come into contact with the surface of the battery cell 21. The shape of the slot 25a is not limited, as long as it can allow the liquid medium L to flow through.

[0170] As an example, the septum 25 includes an isolation section that encloses a liquid-permeable cavity 25b, and a slot 25a is located in the isolation section. The structure or location of the slot 25a within the isolation section can vary.

[0171] Please see Figure 14 The separator 25 includes first insulating portions 252, which correspond to the four corners of the side of the battery cell 21. Each first insulating portion 252 surrounds a liquid-permeable cavity 25b, and adjacent first insulating portions 252 are spaced apart to form slots 25a. As an example, the cross-section of the first insulating portion 252 is approximately L-shaped. Understandably, the cross-section of the first insulating portion 252 can also be rectangular, with slots 25a provided on all four sides of the rectangle.

[0172] Please see Figure 15 The separator 25 includes second insulating portions 253, which correspond to the two sides of the side of the battery cell 21. Two second insulating portions 253 are arranged to form a liquid-permeable cavity 25b, and are spaced apart to form slots 25a. As an example, the cross-section of the second insulating portion 253 is approximately U-shaped. Understandably, the cross-section of the second insulating portion 253 can also be rectangular, with slots 25a provided on both opposite sides of the rectangle.

[0173] For example, please refer to Figure 16 The separator 25 includes spaced first spacers 251, with a slot 25a and a liquid passage cavity 25b formed between two adjacent first spacers 251. The slot 25a is located at both ends of the liquid passage cavity 25b. The first spacers 251 help to reduce the area of ​​the separator 25, which in turn helps to reduce the side area of ​​the covered battery cell 21 and improve the thermal management effect.

[0174] For example, please refer to Figure 17The spacer 25 includes a continuously extending second spacer strip 254, which winds around in a plane starting from a starting end to form a multi-layered coiled body. The second spacer strip 254 has gaps between adjacent layers, forming liquid-permeable cavities 25b. A slot 25a is located in the gap between the starting end and adjacent layers, and also on the second spacer strip 254. The second spacer strip 254 reduces the number of components and facilitates the installation of the spacer 25.

[0175] For example, please refer to Figure 18 The separator 25 includes a mesh, the mesh space of which forms a liquid passage cavity 25b. A slot 25a is located on the mesh so that each mesh can form a passageway. The mesh facilitates more uniform contact between the liquid medium L and the sides of the battery cell 21.

[0176] In some embodiments, the separator 25 extends through multiple battery cell assemblies 202 along the second direction Y. That is, the separators 25 corresponding to two adjacent battery cells 21 along the second direction Y in the battery module 201 are connected to form a continuous integral component. In this way, the total number of separators 25 can be reduced, and the number of components in the battery device 100 can be reduced.

[0177] In other embodiments, each battery cell 21 is provided with a spacer 25 along the second direction Y. That is, the spacers 25 corresponding to two adjacent battery cells 21 along the second direction Y in the battery module 201 are separately provided.

[0178] In other embodiments, the separator 25 extends through the plurality of battery cell assemblies 202 along the first direction X. That is, the separators 25 corresponding to two adjacent battery cells 21 along the first direction X in the battery module 201 are connected to form a continuous integral component. In this way, the total number of separators 25 can be reduced, and the number of components in the battery device 100 can be reduced.

[0179] In other embodiments, each battery cell 21 is provided with a spacer 25 along the first direction X. That is, the spacers 25 corresponding to two adjacent battery cells 21 along the first direction X in the battery module 201 are separately provided.

[0180] In some embodiments, each battery cell 21 is provided with a spacer 25 along the first direction X; each battery cell 21 is provided with a spacer 25 along the second direction Y. In this way, the spacers 25 can be assembled with the battery cells 21 corresponding to each other, which facilitates overall assembly and disassembly and subsequent maintenance.

[0181] In some embodiments, please refer to Figure 11 , Figure 12 and Figure 13The battery module 201 includes a support member 24, which is disposed along a first direction X and located between two adjacent battery cells 21 along a third direction Z. The support member 24 acts as a spacer structure, separating the two adjacent battery cells 21 along the third direction Z to allow liquid medium L to enter between the two adjacent battery cells 21. Furthermore, the support member 24 provides support for the battery cells 21 above it.

[0182] As an example, support member 24 includes a support plate. The support plate is, for example, a steel strip, which has good structural strength and rigidity, small deformation, and therefore good structural dimensional stability without occupying too much space.

[0183] Furthermore, the support member 24 includes an insulating layer, which is respectively disposed on the upper and lower sides of the support plate to insulate the support plate from the battery cell 21 and reduce the possibility of short circuit between adjacent battery cells 21.

[0184] Furthermore, the insulation layer covers the entire outer surface of the support plate.

[0185] In some embodiments, combined with Figure 11 In each battery module 201, two adjacent battery cells 202 share a support member 24. That is, each support member 24 connects two adjacent battery cells 202 simultaneously. A portion of the support member 24, projected along the third direction Z, is located in one of the battery cells 202, and another portion of the support member 24, projected along the third direction Z, is located in the other battery cell 202. This reduces the number of support members 24 and facilitates assembly and disassembly. It also provides a limiting function for the two adjacent battery cells 202, ensuring that their end faces are flush.

[0186] Understandably, the support 24 will not cover the entire end face of the battery cell 21 so that the liquid medium L can contact the end face of the battery cell 21 for thermal management.

[0187] Furthermore, combined Figure 9 The terminal post of the battery cell 21 is set along the third direction Z, and the support member 24 is set along the first direction X on the shoulder 211 of the multiple battery cells 21.

[0188] The portions of the end face of the battery cell 21 located on both sides of the terminal post are called shoulders 211 of the battery cell 21. Multiple shoulders 211 of the battery cells 21 are connected to form a shoulder region. A support member 24 is located in the shoulder region. Because the support member 24 is located on the shoulder 211, it does not cover the entire end face of the battery cell 21. The remaining portions of the end face that contact the support member 24 can contact the liquid medium L to achieve thermal management.

[0189] In some embodiments, please refer to... Figure 12 and Figure 13 The battery module 201 also includes an end plate 23. The multiple battery cell components 202 are provided with end plates 23 along the outer periphery of the first direction X and the second direction Y. The two ends of the support member 24 are respectively connected to the corresponding end plates 23.

[0190] Since the end plate 23 is located on the outer periphery of all battery cells 21 in the battery module 201 along the first direction X and the second direction Y, the outermost battery cell 21 along the first direction X and the second direction Y is limited by the end plate 23. The end plate 23 provides a limiting force to the battery cell 21, and the force is transmitted sequentially between adjacent battery cells 21 to limit the battery cell 21 in the horizontal direction. Furthermore, the two ends of the support member 24 are respectively connected to the corresponding end plate 23, so that the end plate 23 and the support member 24 can form an integral frame, so that the battery module 201 forms an integral structure.

[0191] Furthermore, the end plate 23 is locked to the column 22.

[0192] The end plates 23 are locked to the columns 22 and the two ends of the support members 24 are respectively connected to the corresponding end plates 23, so that the end plates 23, columns 22 and support members 24 can form an overall frame, and the battery modules 201 of each layer are connected to form a battery assembly 20, so that the battery assembly 20 forms a fixed whole.

[0193] In some embodiments, please refer to Figure 12 and Figure 13 The battery module 201 includes an end plate 23, a support member 24, a separator 25, and multiple battery cells 21. Each of the multiple battery cell assemblies 202 has an end plate 23 disposed on its outer periphery along the first direction X and the second direction Y, and the end plate 23 is locked to a column 22. The support member 24 is disposed along the first direction X on the shoulder 211 of the multiple battery cells 21, and both ends of the support member 24 are respectively connected to the corresponding end plate 23. The separator 25 is disposed between two adjacent battery cells 21 in the battery cell assembly 202.

[0194] Thus, by connecting the end plate 23 to the support member 24, the battery module 201 forms a fixed whole; by locking the end plate 23 to the column 22 and connecting the two ends of the support member 24 to the corresponding end plate 23, the end plate 23, column 22 and support member 24 can form an overall frame, connecting the battery modules 201 of each layer to form the battery assembly 20, so that the battery assembly 20 forms a fixed whole.

[0195] In some embodiments, please refer to Figure 11 and Figure 14The housing 10 also includes a first limiting member 14, which is disposed on the bottom frame 11 and limits the battery assembly 20, thereby spacing the battery assembly 20 from at least one side wall 12. This allows for a gap between the battery assembly 20 and the side wall 12, enabling the liquid medium L to fill the space between the battery assembly 20 and the side wall 12.

[0196] Furthermore, the first limiting member 14 is provided for each sidewall 12 so that the battery assembly 20 is spaced apart from each sidewall 12. In this way, a gap is formed between the battery assembly 20 and each sidewall 12, so that the battery assembly 20 is completely immersed in the liquid medium L, thereby improving the thermal management efficiency of the liquid medium L for the battery assembly 20.

[0197] The first limiting member 14 is used to limit the battery assembly 20, constraining the battery assembly 20 in the horizontal direction and restricting the battery assembly 20 from displacement. Furthermore, the first limiting member 14 enables the battery assembly 20 to be quickly aligned in the installation position when installed in the receiving cavity 10a, facilitating rapid assembly.

[0198] In other embodiments, a first limiting member 14 is disposed on a side wall 12 to limit the battery assembly 20, thereby spacing the battery assembly 20 from each side wall 12.

[0199] In other embodiments, a first limiting member 14 is disposed on the bottom frame 11 and the side wall 12 to limit the battery assembly 20, thereby spacing the battery assembly 20 from each side wall 12.

[0200] As an example, the first limiting member 14 can be a limiting block, or the first limiting member 14 can be a limiting pin.

[0201] In some embodiments, please refer to Figure 14 The first limiting member 14 has a guide surface 141 to guide the battery assembly 20 in the receiving cavity 10a. By providing the guide surface 141, the action of installing the battery assembly 20 can be guided, making it easier for the battery assembly 20 to be installed in place.

[0202] In some embodiments, the battery assembly 20 is relatively heavy and is not prone to vertical displacement, so no limiting structure is set in the vertical direction for constraint.

[0203] In some embodiments not shown, a second limiting member is provided on the side wall 12 to limit the battery assembly 20 in the vertical direction, so that after the cover 13 is connected to the side wall 12, the battery assembly 20 and the housing 10 are fixed relative to each other in the vertical direction.

[0204] In other embodiments not shown, a second limiting member is provided on the cover 13 to limit the battery assembly 20 in the vertical direction, so that after the cover 13 is connected to the side wall 12, the battery assembly 20 and the housing 10 are fixed relative to each other in the vertical direction.

[0205] In some embodiments, please refer to Figures 9 to 13 The battery device 100 includes a housing 10, a battery assembly 20, a liquid medium L, and a heat exchange mechanism 30. The housing 10 includes six walls 101, which together form a receiving cavity 10a. Each wall 101 has a double-layer cavity structure, which is a vacuum structure. The housing 10 includes a bottom frame 11, four side walls 12, a cover 13, a sealing gasket 15, fasteners 16, and a first limiting member 14. The four side walls 12 are fixedly connected to the bottom frame 11 to form a groove structure with an open end; the cover 13 is detachably connected to the side walls 12 to close the open end of the groove structure. The sealing gasket 15 is disposed between the cover 13 and the side walls 12; the fasteners 16 are locked to the cover 13 and the side walls 12. The first limiting member 14 is disposed on the bottom frame 11 to limit the battery assembly 20, thus spacing the battery assembly 20 from each side wall 12. The bottom frame 11, side walls 12, and cover 13 are all walls 101, each with a double-layer cavity structure. The battery assembly 20 includes multiple battery cells 21, and is disposed within a receiving cavity 10a. A liquid medium L is disposed within the receiving cavity 10a to immerse the battery assembly 20. A heat exchange mechanism 30 is disposed within the housing 10 to exchange heat with the liquid medium L. The battery assembly 20 includes stacked multi-layer battery modules 201 and columns, with each layer of battery modules 201 locked to a column 22. The multi-layer battery modules 201 are connected to form a whole via the columns 22. The battery module 201 includes an end plate 23, a support member 24, a separator 25, and multiple battery cells 21. Multiple battery cell assemblies 202 are provided with end plates 23 along the outer periphery of the first direction X and the second direction Y, and the end plates 23 are locked to the column 22; support members 24 are provided along the first direction X on the shoulders 211 of multiple battery cells 21, and the two ends of the support members 24 are respectively connected to the corresponding end plates 23; spacers 25 are provided between two adjacent battery cells 21 in the battery cell assembly 202. The battery device 100 also includes a temperature sensor 50 and a liquid level sensor 40. The temperature sensor 50 is provided in the housing 10 and located in the receiving cavity 10a to detect the temperature in the receiving cavity 10a. The liquid level sensor 40 is provided in the housing 10 and located in the receiving cavity 10a to detect the position of the liquid medium L. The heat exchange mechanism 30 includes a fan 34, an inlet pipe 31, an outlet pipe 32, and a heat exchanger 33. The inlet pipe 31 is connected to the receiving cavity 10a; the outlet pipe 32 is connected to the receiving cavity 10a; the heat exchanger 33 is located on the outside of the housing 10, and the heat exchanger 33 is connected to the inlet pipe 31 and the outlet pipe 32 respectively. The fan 34 is used to dissipate heat from the heat exchanger 33.

[0206] In this embodiment, immersing the battery assembly 20 in the liquid medium L increases the heat dissipation area, resulting in a more uniform overall temperature inside the housing 10. This leads to higher charging and discharging consistency of the battery device 100, increasing usable power and eliminating the need for a water-cooling plate, thus reducing the production cost of the battery device 100. When a battery cell 21 experiences thermal runaway, the liquid medium L can rapidly cool the battery cell 21, preventing heat from spreading to other battery cells 21. This eliminates the need for fire-resistant components and other fireproof structures, which are space-consuming, costly, and difficult to obtain. Eliminating these fire-resistant components in this application further reduces costs and increases the energy density of the battery device 100. Furthermore, since the battery cell 21 is in direct contact with the liquid medium L, the heat exchange efficiency is high, reducing the need for cooling the liquid medium L. Thus, the liquid medium L can be cooled via a heat exchanger, eliminating the need for a refrigeration unit. Refrigeration units are costly, bulky, difficult to maintain, have low heating efficiency, low energy conversion rate, and high energy consumption. Eliminating the refrigeration unit in this application reduces costs, decreases space requirements, and increases energy density. Furthermore, when the battery cells 21 in the battery assembly 20 are stacked in multiple layers, the bottommost cell 21 bears a significant load, affecting the lifespan of the battery device 100 and increasing the risk of failure. This application uses a liquid medium L to immerse the battery assembly 20, reducing the load on the bottom cells and lowering the risk of structural failure due to the gravity of the upper layers. The cavity of the double-layer cavity structure is evacuated to reduce its thermal conductivity and improve insulation performance. Each wall 101 has a double-layer cavity structure, which reduces the thermal conductivity of each wall 101, further improving insulation. The cover 13 and side wall 12 are fixedly connected by fasteners 16, and the sealing gasket 15 is pressed between the cover 13 and the side wall 12 to achieve a sealed connection between the cover 13 and the side wall 12, thereby improving the overall sealing effect after connection. The temperature of the receiving cavity 10a can be controlled by acquiring the temperature inside the receiving cavity 10a. Liquid level control is achieved by acquiring the position of the liquid medium L. If the liquid level of the liquid medium L is lower than the preset position, an alarm signal will be issued to replenish the liquid medium L in time. The fan 34 can cool the heat exchanger 33 to improve the heat dissipation efficiency of the heat exchanger 33. The end plate 23 is connected to the support member 24 to form a fixed whole for the battery module 201. The end plate 23 is locked to the column 22, and the two ends of the support member 24 are respectively connected to the corresponding end plate 23, so that the end plate 23, column 22 and support member 24 can form an overall frame, connecting the battery modules 201 of each layer to form the battery assembly 20, making the battery assembly 20 a fixed whole. The gap between the battery assembly 20 and each sidewall 12 by the first limiting member 14 allows the battery assembly 20 to be fully immersed in liquid medium L, thereby improving the thermal management efficiency of the liquid medium L for the battery assembly 20.

[0207] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery device, characterized in that, include: The box includes multiple walls that enclose a cavity, and at least one of the walls has a double-layer cavity structure, wherein the double-layer cavity structure is a vacuum structure. A battery assembly, comprising multiple individual battery cells, is disposed within the receiving cavity; A liquid medium is disposed in the receiving cavity to immerse the battery assembly; A heat exchange mechanism is provided in the housing to exchange heat with the liquid medium.

2. The battery device according to claim 1, characterized in that, The enclosure includes: Base frame; At least one sidewall is fixedly connected to the bottom frame to enclose and form a groove structure with an open end; The cover is detachably connected to the side wall to seal the opening end of the groove structure; The bottom frame, the side walls, and the cover are all walls, and each wall has the double-layer cavity structure.

3. The battery device according to claim 2, characterized in that, The number of sidewalls is four, and the cross-sectional profile of the trough structure is rectangular.

4. The battery device according to claim 2, characterized in that, The enclosure also includes: A first limiting member is disposed on the bottom frame and / or side wall to limit the battery assembly, thereby spacing the battery assembly from at least one of the side walls.

5. The battery device according to claim 4, characterized in that, The first limiting member is provided for each of the sidewalls so that the battery assembly is spaced apart from each of the sidewalls.

6. The battery device according to claim 4, characterized in that, The first limiting member has a guide surface to guide the battery assembly in the receiving cavity.

7. The battery device according to claim 2, characterized in that, The enclosure also includes: A sealing gasket is disposed between the cover and the side wall; Fasteners are fastened to the cover and the sidewall.

8. The battery device according to claim 1, characterized in that, The battery assembly includes a column and stacked multi-layer battery modules, each battery module comprising multiple individual battery cells, with each layer of the battery module locked to the column.

9. The battery device according to claim 8, characterized in that, Multiple battery cells are arranged along a first direction to form a battery cell assembly, and multiple battery cell assemblies are arranged along a second direction. The terminals of the battery cells are arranged along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. The battery module also includes: End plates are provided on the outer periphery of the plurality of battery cell assemblies along the first direction and the second direction, and the end plates are locked to the column; A support member is disposed on the shoulder of a plurality of battery cells along the first direction, and the two ends of the support member are respectively connected to the corresponding end plates; A spacer is disposed between two adjacent battery cells in the battery module.

10. The battery device according to claim 9, characterized in that, In each layer of the battery module, two adjacent battery cells share one support member.

11. The battery device according to claim 9, characterized in that, The septum has a slot and a liquid passage chamber, so that the liquid medium can flow from the slot into the liquid passage chamber and come into contact with the surface of the battery cell.

12. The battery device according to claim 11, characterized in that, The septum includes an isolation section, which surrounds and forms the liquid-passing cavity, and the slot is located in the isolation section; or... The septum includes spaced-apart first spacers, with the slot and the liquid passage cavity formed between two adjacent first spacers; the slot is located at both ends of the liquid passage cavity; or, The septum includes a continuously extending second septum strip, which is coiled in a plane starting from a starting end to form a coiled body with a multi-layer structure. The second septum strip has gaps between adjacent layers, which form the liquid passage cavity. The slot is located in the gap between the starting end and the adjacent layer, and the slot is located on the second septum strip. or, The septum includes a mesh, the mesh space of which forms the fluid passage cavity, and the slot is located in the mesh so that each mesh can form a passage.

13. The battery device according to claim 9, characterized in that, The spacer extends through the plurality of battery cell assemblies along the second direction; or... Each of the battery cells is provided with one spacer along the second direction; or, The spacer extends through the battery cell assembly along the first direction; or... Each of the battery cells is provided with a separator along the first direction.

14. The battery device according to any one of claims 1 to 13, characterized in that, The battery device also includes: A liquid level sensor, disposed in the housing and located in the receiving cavity, is used to detect the position of the liquid medium; and / or, A temperature sensor, disposed within the housing and located in the receiving cavity, is used to detect the temperature within the receiving cavity; and / or, A heating device, disposed in the housing and located in the receiving cavity, for heating the liquid medium; and / or, A pressure relief valve is provided in the housing to relieve pressure in the receiving cavity.

15. The battery device according to any one of claims 1 to 13, characterized in that, The heat exchange mechanism includes: The inlet pipe is connected to the receiving cavity; The liquid outlet pipe is connected to the receiving cavity; A heat exchanger is disposed on the outside of the housing, and the heat exchanger is connected to the inlet pipe and the outlet pipe respectively; A fan is installed on the outside of the housing or on the heat exchanger to dissipate heat from the heat exchanger.

16. The battery device according to claim 15, characterized in that, The inlet pipe and the outlet pipe are respectively connected to opposite sides of the receiving cavity.

17. An energy storage device, characterized in that, include: The battery device according to any one of claims 1 to 16 is used for storing or providing electrical energy.

18. The energy storage device according to claim 17, characterized in that, The energy storage device is configured as an energy storage container or an energy storage cabinet.

19. An energy storage system, characterized in that, include: The energy storage device according to claim 17 or 18; An energy storage converter is electrically connected to the energy storage device and the power generation device.

20. A charging network, characterized in that, include: Charging stations; The energy storage device according to claim 17 or 18 is electrically connected to the charging pile and is used to provide electrical energy.

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