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

Abstract

The application provides a battery device, an energy storage device, an energy storage system and a charging network. The battery device comprises a box body, a plurality of battery cell assemblies and at least one connecting member. The box body has a containing space. The plurality of battery cell assemblies are arranged in the containing space. The plurality of battery cell assemblies are arranged along a first direction. A single battery cell assembly comprises a plurality of battery cells arranged along a second direction. The connecting member extends along the second direction and is connected with at least two battery cells in at least one battery cell assembly. The connecting member is located on at least one side of the battery cell assembly along a third direction. The first direction, the second direction and the third direction intersect with each other. The light transmittance of the connecting member is greater than or equal to 50% and less than 100%. Since the light transmittance of the connecting member is greater than or equal to 50%, that is, the connecting member has light transmittance, the connecting member can be used as an observation window, so that the state of the connecting interface between the connecting member and the battery cell assembly can be visually detected.

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] With the development of new energy technologies, the application of batteries is becoming increasingly widespread, including in electric vehicles, robots, drones, power tools, and aerospace equipment. Furthermore, batteries are increasingly being used in energy storage. In some related technologies, battery devices consist of a housing and multiple individual battery cells housed within it. Improving the stability of these individual battery cells within the housing has become a key concern in the industry. Utility Model Content

[0003] This application provides a battery device, an energy storage device, an energy storage system, and a charging network, which enable the state of the connection interface between the connecting member and the battery cell assembly to be visually detected, facilitating timely improvement of the connection interface between the connecting member and the battery cell assembly, and ensuring that the connecting member is tightly connected to at least two battery cells, thereby improving the connection stability between the battery cells and the connecting member.

[0004] The technical solution of this application embodiment is implemented as follows: In a first aspect, embodiments of this application provide a battery device, including a housing, a plurality of battery cell assemblies, and at least one connecting member. The housing has a receiving space; the plurality of battery cell assemblies are disposed within the receiving space, and the plurality of battery cell assemblies are arranged along a first direction. Each battery cell assembly includes a plurality of battery cells arranged along a second direction; the connecting member extends along the second direction and is connected to at least two battery cells in the at least one battery cell assembly. The connecting member is located on at least one side of the battery cell assembly along a third direction. The first direction, the second direction, and the third direction intersect each other. The light transmittance of the connecting member is greater than or equal to 50% and less than 100%.

[0005] In the above technical solution, the connecting member extends along the direction of the multiple battery cells in the battery cell assembly and connects to at least two of them. This helps to suppress the upward movement of the battery cells connected to the connecting member, thereby improving the stability of the battery cells within the accommodating space. It also helps to improve the overall rigidity and mechanical strength of the battery cell assembly against vibration and shock. During assembly, after the connecting member is connected to the battery cell assembly, since the light transmittance of the connecting member is greater than or equal to 50%, it can serve as an observation window. This allows the state of the connection interface between the connecting member and the battery cell assembly to be visually detected, improving detection efficiency and thus assembly efficiency. It also facilitates timely improvement of the connection interface between the connecting member and the battery cell assembly, ensuring a tight connection between the connecting member and at least two battery cells, thereby improving the connection stability between the battery cells and the connecting member, and ultimately increasing product yield.

[0006] In some implementation schemes, the light transmittance of the connecting component is 80%-95%. That is, the light transmittance of the connecting component is greater than or equal to 80% and less than or equal to 95%. By further limiting the light transmittance of the connecting component, the light transmittance of the connecting component is improved, which is conducive to further improving the efficiency of visual inspection.

[0007] In some embodiments, the battery assembly includes a spacer that is at least partially located between a battery cell and a connecting member along a third direction. The spacer serves to position the connecting member or to connect the battery cell to the connecting member. In this embodiment, the light transmittance of the connecting member can be used to quickly confirm whether a spacer is missing, which helps improve assembly efficiency and product yield.

[0008] In some implementations, the spacer includes an adhesive layer, through which the connecting member is bonded to the battery cell assembly. The bonding process is convenient. The spacer can at least be used to connect the battery cell to the connecting member.

[0009] In some implementations, the connecting components and battery cell modules are bonded together using a photocurable structural adhesive. The bonding process is convenient; because the connecting components are translucent, ultraviolet / visible light can pass through them, allowing the liquid photocurable structural adhesive between the connecting components and battery cell modules to cure rapidly. This improves the assembly efficiency of the connecting components and battery cell modules, thereby increasing production efficiency. The photocurable structural adhesive exhibits good shear strength and strong adhesive compatibility after curing, which helps ensure a stable connection between the connecting components and battery cells. Furthermore, the state of the photocurable structural adhesive can be visually monitored through the connecting components, indicating whether it is fully cured, whether the cured adhesive layer is evenly distributed, and whether there are any defects such as air bubbles or adhesive leakage. The cured adhesive layer constitutes the bonding layer.

[0010] In some implementation schemes, the photocurable structural adhesive is one of ultraviolet (UV) curable structural adhesive, visible light curable structural adhesive, or UV-blue light dual-band curable structural adhesive. All three types of structural adhesives exhibit fast curing efficiency under light irradiation and good bonding performance.

[0011] In some implementations, the connecting components are made of polycarbonate or acrylic. Both polycarbonate and acrylic have a light transmittance of over 80%, meaning they have good light transmission performance. Polycarbonate and acrylic also have high hardness, which meets the structural strength requirements for fixing individual battery cells. Furthermore, they are lightweight, which also meets the requirements for lightweight battery devices.

[0012] In some implementations, the thickness of the connecting member along a third direction is 0.5mm-4mm. This ensures that the thickness of the connecting member is appropriate, meeting both the structural strength requirements and the lightweight requirements of the battery device.

[0013] In some implementations, the connecting member is connected to any two adjacent battery cells. This facilitates the relative fixation of adjacent battery cells, allowing them to form a unified whole through the connecting member. This further enhances the ability of the battery cells and, consequently, the entire battery device to withstand vibration and shock.

[0014] In some implementations, at least two of the multiple battery cell modules form a battery module, and the battery device includes multiple battery modules. Connecting members are connected to any two adjacent battery modules. This facilitates the relative fixation of two adjacent battery modules, allowing them to form a whole through the connecting members, which helps improve the ability of the battery modules and thus the entire battery device to withstand vibration and shock.

[0015] In some implementations, within each battery module, the connecting component is connected to any two adjacent battery cells. This helps improve the vibration and shock resistance of a single battery module, thereby further enhancing the overall vibration and shock resistance of the battery device.

[0016] In some implementations, the battery device includes multiple sets of end plates, each set of end plates being disposed on opposite sides of a corresponding battery module along a second direction. The end plates provide support for the battery module on both sides in the second direction.

[0017] In some embodiments, the battery cell includes a housing and electrode terminals. The electrode terminals are disposed on a surface of the housing along a third direction. The surface of the housing along a third direction includes a first shoulder and a second shoulder, which are respectively located on both sides of the electrode terminals. A connecting member is connected to the first shoulder or the second shoulder of at least two battery cells in the battery cell assembly.

[0018] In the above technical solution, on the one hand, surface contact between the battery cell and the connecting member is achieved, which is beneficial to improving the connection stability between the connecting member and the battery cell assembly; on the other hand, it is beneficial to prevent interference between the connecting member and the electrode terminals. In the battery cell connected to the connecting member, either the first shoulder of the battery cell or the second shoulder of the battery cell can be connected to the connecting member.

[0019] In some implementations, the thickness of the connecting member is less than or equal to the height by which the electrode terminals protrude from the housing along its thickness direction. This helps to reduce the impact on the assembly of subsequent components, such as the busbar assembly, and also helps to control the dimensions of the battery device in the third direction.

[0020] In some embodiments, the housing includes a base plate with a bearing surface and a heat exchange medium flow channel inside the base plate, on which multiple battery cell assemblies are supported; at least one group of two adjacent battery cell assemblies arranged along a first direction are connected to a connecting member, wherein the first shoulder of multiple battery cells in one battery cell assembly is adjacent to the second shoulder of multiple battery cells in another battery cell assembly, and the connecting member is simultaneously connected to at least two groups of adjacent first and second shoulders.

[0021] In the above technical solution, the heat exchange medium flow channel of the base plate is conducive to heat dissipation and cooling of the battery cell assembly, reducing the probability of overheating of the battery cell assembly and improving the safety performance of the battery device. The connecting member is simultaneously connected to at least two sets of adjacent first shoulders and second shoulders, realizing surface contact between the connecting member and two adjacent battery cell assemblies, and improving the stability of the connection between the connecting member and the two adjacent battery cell assemblies.

[0022] Secondly, embodiments of this application provide an energy storage device, including an energy storage box and a battery device provided in any embodiment of this application, wherein the battery device is disposed inside the energy storage box.

[0023] Thirdly, embodiments of this application provide an energy storage system, including an energy storage converter and an energy storage device provided in any embodiment of this application, wherein the energy storage converter is used to electrically connect the energy storage device and the power generation device.

[0024] Fourthly, embodiments of this application provide a charging network, including a charging pile and an energy storage device provided in any embodiment of this application. The energy storage device is electrically connected to the charging pile and is used to provide electrical energy. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the charging network structure in some embodiments of this application; Figure 2 This is a schematic diagram of the energy storage system in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of the energy storage device in some embodiments of this application; Figure 4 This is a schematic diagram of the battery device provided in the first embodiment of this application; Figure 5 for Figure 4 A schematic cross-sectional view of the structure shown along the AA direction; Figure 6 for Figure 5 Enlarged schematic diagram of part B; Figure 7 A schematic diagram showing the connection member and two adjacent battery cells in cooperation with another embodiment of this application; Figure 8 The figure shows a schematic diagram of the battery device provided in the second embodiment of this application.

[0026] Explanation of reference numerals in the attached figures 1000, Charging network; 2000, Energy storage system; 3000, Power generation device; 100. Battery assembly; 10. Battery module; 11. Battery cell assembly; 111. Battery cell; 1111. Housing; 1111a. First shoulder; 1111b. Second shoulder; 1112. Electrode terminal; 20. Housing; 21. Base plate; 21a. Bearing surface; 21b. Heat exchange medium flow channel; 30. Connecting member; 40. End plate; 50. Binding strap; 60. Spacer; 60a. First part; 60b. Second part; 61. Adhesive layer. Detailed Implementation

[0027] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having” and any variations thereof are intended to cover non-exclusive inclusion.

[0029] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments in this application, 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0032] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0033] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0035] The following is a detailed description of this application.

[0036] With the development of new energy technologies, batteries are being used in an increasingly wide range of fields, such as electric vehicles, robots, drones, power tools, and aerospace equipment. In addition, batteries are increasingly being used in energy storage. In energy storage, batteries can be installed in storage enclosures or directly at the user's location.

[0037] In some related technologies, battery devices include a housing and multiple battery cells housed within the housing. Improving the stability of these multiple battery cells within the housing has become a key industry concern. To enhance the structural stability of these multiple battery cells, some related technologies consider dividing them into multiple battery cell assemblies. These assemblies are arranged along a first direction, and each assembly includes multiple battery cells arranged along a second direction. For at least one assembly, a pressure strip is placed on the side of the assembly away from the housing's bearing surface. This pressure strip connects to the surfaces of the battery cells in the assembly away from the bearing surface, thereby improving the overall rigidity and vibration resistance of the assembly. However, the pressure strip is typically made of epoxy resin, which is opaque. Therefore, the connection between the pressure strip and the battery cells cannot be monitored during assembly, leading to loose connections. This can affect the overall rigidity and vibration resistance of the assembly, ultimately impacting product yield.

[0038] To address at least some of the aforementioned problems, embodiments of this application provide a battery device, comprising a housing, a plurality of battery cell assemblies, and at least one connecting member. The housing has a receiving space. The plurality of battery cell assemblies are disposed within the receiving space, arranged along a first direction, with each battery cell assembly including a plurality of battery cells arranged along a second direction. The connecting member extends along the second direction and connects to at least two battery cells in the at least one battery cell assembly. The connecting member is located on at least one side of the battery cell assembly along a third direction, and the first, second, and third directions intersect each other pairwise. The light transmittance of the connecting member is greater than or equal to 50% and less than 100%.

[0039] It should be noted that the connecting member is located on at least one side of the battery cell assembly along the third direction. The connecting member can be provided on one side of the battery cell assembly along the third direction, or the connecting member can be provided on both sides of the battery cell assembly along the third direction.

[0040] It should be noted that "at least one" refers to one or more, while "multiple" refers to two, three, or more. That is, a connecting member can connect to at least two battery cells of a single battery cell assembly, or it can connect to at least two battery cells of two adjacent battery cell assemblies simultaneously. A connecting member can connect to some or all battery cells of a battery cell assembly simultaneously. It is possible for some battery cell assemblies to be connected to the connecting member, or for all battery cell assemblies to be connected to the connecting member; therefore, there is no limit to the number of connecting members.

[0041] The battery device provided in this application embodiment has a connecting member extending along the direction of the arrangement of multiple battery cells in the battery cell assembly and connected to at least two of the battery cells. This helps to suppress the upward movement of the battery cells connected to the connecting member in a third direction, thereby improving the stability of the battery cells within the accommodating space. It also helps to improve the overall rigidity and mechanical strength of the battery cell assembly against vibration and shock. During assembly, after the connecting member is connected to the battery cell assembly, since the light transmittance of the connecting member is greater than or equal to 50%, the connecting member can serve as an observation window, allowing the state of the connection interface between the connecting member and the battery cell assembly to be visually detected. This improves detection efficiency, thereby improving assembly efficiency. It also facilitates timely improvement of the connection interface between the connecting member and the battery cell assembly, ensuring a tight connection between the connecting member and at least two battery cells, thus improving product yield.

[0042] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0043] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0044] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing. As an example, the individual battery cells may be battery modules, which can be housed within the housing by securing the battery modules to the housing.

[0045] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0046] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. This closed space houses the individual battery cells and support beams. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The second enclosure may be a top cover or a bottom plate.

[0047] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the battery cells and support beams.

[0048] In some embodiments, the enclosure may be part of the chassis structure of the vehicle / aircraft. For example, a portion of the enclosure may be at least a part of the floor of the vehicle / aircraft, or a portion of the enclosure may be at least a part of the crossbeams and longitudinal beams of the vehicle / aircraft.

[0049] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. Multiple battery cells are connected in series, parallel, or in a mixed configuration via a busbar.

[0050] In some examples, the battery cell is used to store or provide electrical energy, and the working medium of the battery cell can be lithium ions, sodium ions, magnesium ions, sodium lithium ions, lithium metal, sodium metal, lithium sulfur, nickel hydride, nickel cadmium, lead, etc., which are not limited in this disclosure.

[0051] In this embodiment, the battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0052] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0053] In some embodiments, the negative electrode may be a negative electrode sheet, which 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.

[0054] 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.

[0055] 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.

[0056] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0057] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0058] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0059] In some implementations, the electrode assembly is a stacked structure.

[0060] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0061] 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.

[0062] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0063] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0064] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0065] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0066] 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.

[0067] In some embodiments, a 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.

[0068] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0069] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided one or more.

[0070] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0071] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0072] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0073] This application also provides an electrical device, including a battery device provided in any embodiment of this application, the battery device being used to store or provide electrical energy.

[0074] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, aircraft, and robots. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Aircraft generally refer to devices that fly within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, and regional aircraft. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0075] This application provides an energy storage device, which includes an energy storage box and a battery device provided in any embodiment of this application. The battery device is located inside the energy storage box.

[0076] This application also provides an energy storage system, which includes an energy storage converter and an energy storage device provided in any embodiment of this application. The energy storage converter is used to electrically connect the energy storage device and the power generation device.

[0077] This application also provides a charging network, which includes a charging pile and an energy storage device provided in any embodiment of this application. The energy storage device is electrically connected to the charging pile and is used to provide electrical energy.

[0078] The embodiments of this application are described below with reference to the accompanying drawings.

[0079] Please refer to Figure 1 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a charging network 1000 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of an energy storage device 200 provided in some embodiments of this application. Embodiments of this application provide 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, which is electrically connected to the charging pile 300 and provides power to the charging pile 300.

[0080] It should be noted that the charging pile 300 and the battery cells in the energy storage device 200 are electrically connected via cables, and the battery cells can supply their stored electrical energy to the charging pile 300. The charging pile 300 has a connector that can be connected 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.

[0081] 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.

[0082] 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.

[0083] The energy storage device 200 may include a battery device 100, which is electrically connected to the charging pile 300 so that the battery device 100 can provide power to the charging pile 300.

[0084] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of an energy storage system 2000 provided in some embodiments of this application. Embodiments of this application provide an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 400, which is electrically connected to a generator 3000 to convert the electrical power provided by the generator 3000. The energy storage system 2000 may also include an energy storage device 200, which is electrically connected to the energy storage converter 400. The energy storage converter 400 converts the electrical energy provided by the generator 3000 and stores it in the energy storage device 200.

[0085] An energy storage converter 400 is used to connect between 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 energy storage converter 400. The application of the energy storage device 200 in the energy storage system 2000 effectively improves the operational safety of the energy storage system 2000. 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.

[0086] As an example, such as Figure 2As 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.

[0087] Please refer to Figure 3 The energy storage device 200 includes an energy storage box 210, and a battery device 100 is installed inside the energy storage box 210.

[0088] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, etc.

[0089] 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.

[0090] Please see Figure 4 This application provides a battery device 100, which includes a housing 20, a plurality of battery cell assemblies 11, and at least one connecting member 30. The housing 20 has a receiving space. The plurality of battery cell assemblies 11 are disposed within the receiving space and are arranged along a first direction. Each battery cell assembly 11 includes a plurality of battery cells 111 arranged along a second direction. The connecting member 30 extends along the second direction and is connected to at least two battery cells 111 in the at least one battery cell assembly 11. The connecting member 30 is located on at least one side of the battery cell assembly 11 along a third direction. The first direction, the second direction, and the third direction intersect each other. The light transmittance of the connecting member 30 is greater than or equal to 50% and less than 100%.

[0091] It should be noted that the connecting member 30 is located on at least one side of the battery cell assembly 11 along a third direction. The connecting member 30 may be provided on one side of the battery cell assembly 11 along a third direction, or the connecting member 30 may be provided on both sides of the battery cell assembly 11 along a third direction.

[0092] It should be noted that "at least one" refers to one or more, while "multiple" refers to two, three, or more. That is, a connecting member 30 can be connected to at least two battery cells 111 of a single battery cell assembly 11, or it can be connected to at least two battery cells 111 of two adjacent battery cell assemblies 11. A connecting member 30 can be connected to some of the battery cells 111 in a battery cell assembly 11, or it can be connected to all of the battery cells 111 in a battery cell assembly 11. It is possible that some battery cell assemblies 11 are connected to the connecting member 30, or that all battery cell assemblies 11 are connected to the connecting member 30; therefore, the number of connecting members 30 is not limited.

[0093] The battery device 100 provided in this application embodiment has a connecting member 30 extending along the direction of the arrangement of multiple battery cells 111 in the battery cell assembly 11, and connected to at least two of the battery cells 111. This helps to suppress the movement of the battery cells 111 connected to the connecting member 30 in the third direction, thereby improving the stability of the battery cells 111 within the accommodating space. It also helps to improve the overall rigidity and mechanical strength against vibration and impact of the battery cell assembly 11. During the assembly process, after the connecting member 30 is connected to the battery cell assembly 11, since the light transmittance of the connecting member 30 is greater than or equal to 50%, that is, the connecting member 30 is transparent, the connecting member 30 can serve as an observation window. This allows the state of the connection interface between the connecting member 30 and the battery cell assembly 11 to be visually detected, which helps to improve detection efficiency, thereby improving assembly efficiency. It also facilitates timely improvement of the connection interface between the connecting member 30 and the battery cell assembly 11, ensuring that the connecting member 30 is tightly connected to at least two battery cells 111, thereby improving product yield.

[0094] As an example, the first direction, the second direction, and the third direction are perpendicular to each other. Please refer to [reference needed]. Figure 4 and Figure 8 The first direction is indicated by X, the second direction by Y, and the third direction by Z.

[0095] The cross-sectional shape of the connecting member 30 perpendicular to the second direction is not limited; for example, it can be a triangle, a quadrilateral, etc. As an example, such as... Figure 5 As shown, the cross-section of the connecting member 30 perpendicular to the second direction is rectangular, and the thickness of the connecting member 30 in the third direction is less than the width of the connecting member 30 in the first direction.

[0096] In some embodiments, in the battery cell assembly 11 connected to the connecting member 30, all battery cells 111 of the battery cell assembly 11 are connected to the connecting member 30. It is understood that one connecting member 30 may be connected to all battery cells 111 of the battery cell assembly 11, or the aforementioned one connecting member 30 may be divided into multiple connecting members 30, in which case the multiple connecting members 30 are arranged along the second direction.

[0097] As an example, the light transmittance of the connecting member 30 is 80%-95%, that is, the light transmittance of the connecting member 30 is greater than or equal to 80% and less than or equal to 95%. By further limiting the light transmittance of the connecting member 30, the light transmittance of the connecting member 30 is improved, which is conducive to further improving the efficiency of visual detection.

[0098] In some embodiments, such as Figure 6 and Figure 7 As shown, the battery assembly 100 includes a spacer 60, which is at least partially located between the battery cell 111 and the connecting member 30 along a third direction. The spacer 60 is used to position the connecting member 30 or to connect the battery cell 111 and the connecting member 30. In this embodiment, the light transmittance of the connecting member 30 can be used to quickly confirm whether the spacer 60 is missing, which helps to improve assembly efficiency and product yield.

[0099] For example, such as Figure 7 As shown, the spacer 60 includes a first part 60a and a second part 60b that are interconnected. The dimension of the first part 60a along a first direction is smaller than the dimension of the second part 60b along the first direction. The first part 60a is disposed between two adjacent battery cells 111 along the first direction, and the second part 60b is disposed between the connecting member 30 and the battery cell 111 along a third direction. This results in a T-shaped structure for the spacer 60. The spacing between two adjacent battery cells 111 facilitates the positioning and limiting of the first part 60a, while the second part 60b positions the connecting member 30 or connects the battery cell 111 to the connecting member 30.

[0100] In some embodiments, the spacer 60 includes an adhesive layer 61, through which the connecting member 30 and the battery cell assembly 11 are bonded. In this embodiment, the bonding operation is convenient, and the spacer 60 can at least be used to connect the battery cell 111 and the connecting member 30.

[0101] As an example, adhesive layer 61 defines at least a portion of the second part 60b described above.

[0102] In some embodiments, the connecting member 30 is bonded to the battery cell assembly 11 by a photocurable structural adhesive.

[0103] It should be noted that photocurable structural adhesives refer to adhesives that are liquid before light exposure, and that rely on specific wavelengths of ultraviolet / visible light for irradiation, triggering a photoinitiator to polymerize and crosslink the prepolymer and active monomers, allowing for rapid curing at room temperature (e.g., within 30 seconds). After curing, the photocurable structural adhesive forms a three-dimensional crosslinked solid layer with high-strength adhesion and structural load-bearing capacity. It is understood that in this embodiment, the cured adhesive layer can constitute the aforementioned adhesive layer 61.

[0104] In this embodiment, the bonding operation is convenient. Because the connecting member 30 is translucent, ultraviolet / visible light can pass through it, allowing the liquid photocurable structural adhesive between the connecting member 30 and the battery cell assembly 11 to cure rapidly. This improves the assembly efficiency of the connecting member 30 and the battery cell assembly 11, thereby increasing production efficiency. The photocurable structural adhesive exhibits good shear strength and strong adhesive compatibility after curing, which helps ensure a stable connection between the connecting member 30 and the battery cell 111. Furthermore, the state of the photocurable structural adhesive can be visually detected through the connecting member 30, including whether it is fully cured, whether the cured adhesive layer is evenly distributed, and whether there are any air bubbles or adhesive leakage defects.

[0105] As an example, during the assembly of the connecting component 30, a liquid photocurable structural adhesive can be applied to the surface of the connecting component 30 facing the battery cell assembly 11, and then the connecting component 30 can be attached to and pressed tightly with the battery cell assembly 11. Then, the connecting component 30 can be irradiated with ultraviolet / visible light. The ultraviolet / visible light passes through the connecting component 30 to cure the photocurable structural adhesive, thereby achieving the connection between the connecting component 30 and the battery cell assembly 11.

[0106] For example, the photocurable structural adhesive can be an acrylic photocurable structural adhesive.

[0107] For example, the photocurable structural adhesive is one of ultraviolet (UV) curable structural adhesive, visible light curable structural adhesive, or UV-blue light dual-band curable structural adhesive. All three types of structural adhesives exhibit fast curing efficiency under light irradiation and good bonding performance.

[0108] It should be noted that the wavelength range of ultraviolet light is 315–400 nm. The wavelength range of visible light is 400–500 nm. Blue light is a type of visible light, with a wavelength range of 400–480 nm.

[0109] It should be noted that UV-blue light dual-band curing structural adhesive refers to a structural adhesive that can be cured under three conditions: UV light irradiation alone, blue light irradiation alone, and simultaneous UV and blue light irradiation.

[0110] In some embodiments, the connecting member 30 is a polycarbonate (PC) component or an acrylic (PMMA) component. Both polycarbonate and acrylic have a light transmittance greater than 80%, meaning they have good light transmission performance. Polycarbonate and acrylic also have high hardness, which can meet the structural strength requirements for fixing the battery cell assembly 11. Moreover, they are lightweight, which can also meet the lightweight requirements of the battery device 100.

[0111] In some embodiments, such as Figure 6 As shown, the thickness t of the connecting member 30 along the third direction is 0.5mm-4mm, that is, 0.5mm≤t≤4mm.

[0112] As an example, t can be 0.5mm, 1mm, 1.5mm, 1.6mm, 2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 4mm, or any combination of the above values.

[0113] This ensures that the thickness of the connecting member 30 is appropriate, which on the one hand meets the structural strength requirements of the connecting member 30, and on the other hand also takes into account the lightweight requirements of the battery device 100.

[0114] In some embodiments, the connecting member 30 is connected to any two adjacent battery cell assemblies 11. This facilitates the relative fixation of the two adjacent battery cell assemblies 11, allowing them to form a whole through the connecting member 30, which further improves the ability of the battery cell assemblies 11 and, consequently, the entire battery device 100 to withstand vibration and shock.

[0115] It is understood that, in this embodiment, a single battery cell assembly 11 can form a battery module 10 (e.g., Figure 4 (As shown), or multiple battery cell components 11 can form a battery module 10 (e.g. Figure 8 (As shown). In an embodiment where multiple battery cell assemblies 11 form a battery module 10, the connecting member 30 within the battery module 10 is connected to any two adjacent battery cell assemblies 11.

[0116] In some other embodiments, such as Figure 8 As shown, at least two of the multiple battery cell assemblies 11 form a battery module 10, and the battery device 100 includes multiple battery modules 10. A connecting member 30 is connected to any two adjacent battery modules 10. This facilitates the relative fixation of adjacent battery modules 10, allowing them to form a whole through the connecting member 30. This improves the ability of the battery modules 10, and consequently, the entire battery device 10, to withstand vibration and shock.

[0117] As an example, within each battery module 10, the connecting member 30 is connected to any two adjacent battery cell assemblies 11. This helps to improve the ability of a single battery module 10 to withstand vibration and shock, thereby further improving the ability of the entire battery device 100 to withstand vibration and shock.

[0118] Understandably, in other examples, adjacent battery cell assemblies 11 within a single battery module 10 may not be connected to the connecting member 30.

[0119] In some embodiments, please refer to Figure 8 The battery device 100 includes multiple sets of end plates 40, each set of end plates 40 being disposed on opposite sides of the corresponding battery module 10 along the second direction. The end plates 40 provide support for the battery module 10 on both sides in the second direction.

[0120] For example, the battery device 100 includes multiple straps 50. At least one strap 50 surrounds the outer periphery of each set of end plates 40 and the battery module 10. The straps 50 can limit the end plates 40, which helps the end plates 40 clamp the battery module 10, so that each set of end plates 40 can apply a relatively stable clamping force to the battery module 10, which helps resist the expansion deformation of the battery module 10 in the second direction. Moreover, the straps 50 make the battery module 10 and the end plates 40 form a whole, which facilitates transportation.

[0121] As an example, each set of end plates 40 and battery modules 10 is surrounded by two straps 50, which are spaced apart along a third direction.

[0122] It is understandable that, such as Figure 4 As shown, in an embodiment where a single battery cell assembly 11 forms a battery module 10, each set of end plates 40 is disposed on opposite sides of each battery cell assembly 11 in a second direction. In this embodiment, the number of sets of end plates 40 is the same as the number of battery cell assemblies 11.

[0123] In some embodiments, the battery cell 111 includes a housing 1111 and electrode terminals 1112, the electrode terminals 1112 being disposed on the surface of the housing 1111 on one side along a third direction, such as... Figure 5 and Figure 6As shown, the surface of the outer casing 1111 along a third direction includes a first shoulder 1111a and a second shoulder 1111b, which are located on opposite sides of the electrode terminal 1112. The connecting member 30 is connected to the first shoulder 1111a or the second shoulder 1111b of at least two battery cells 111 in the battery cell assembly 11. This achieves surface contact between the battery cell 111 and the connecting member 30, improving the connection stability between the connecting member 30 and the battery cell assembly 11, and also prevents interference between the connecting member 30 and the electrode terminal 1112. In the battery cell 111 connected to the connecting member 30, either the first shoulder 1111a or the second shoulder 1111b of the battery cell 111 can be connected to the connecting member 30.

[0124] In some embodiments, along the thickness direction of the connecting member 30, the thickness of the connecting member 30 is less than or equal to the height at which the electrode terminal 1112 protrudes from the housing 1111. This helps to reduce the impact on the assembly of subsequent components, such as the assembly of the busbar, and also helps to control the dimensions of the battery device 100 in the third direction.

[0125] In some embodiments, the housing 20 includes a base plate 21, the base plate 21 having a bearing surface 21a and a heat exchange medium flow channel 21b inside the base plate 21, and multiple battery cell assemblies 11 are supported on the bearing surface 21a; at least one group of adjacent pairs of battery cell assemblies 11 arranged along a first direction are connected to a connecting member 30, wherein the first shoulder 1111a of multiple battery cells 111 of one battery cell assembly 11 is adjacent to the second shoulder 1111b of multiple battery cells 111 of another battery cell assembly 11, and the connecting member 30 is simultaneously connected to at least two groups of adjacent first shoulders 1111a and second shoulders 1111b.

[0126] In this embodiment, the heat exchange medium flow channel 21b of the base plate 21 facilitates heat dissipation and cooling of the battery cell assembly 11, reduces the probability of overheating of the battery cell assembly 11, and improves the safety performance of the battery device 100. The connecting member 30 is simultaneously connected to at least two sets of adjacent first shoulders 1111a and second shoulders 1111b, realizing surface contact between the connecting member 30 and two adjacent battery cell assemblies 11, and improving the stability of the connection between the connecting member 30 and the two adjacent battery cell assemblies 11.

[0127] It is understood that, among the two adjacent battery cells 111 connected to the connecting member 30, the connecting member 30 can be connected to some of the adjacent first shoulders 1111a and second shoulders 1111b at the same time, or it can be connected to all of the adjacent first shoulders 1111a and second shoulders 1111b at the same time.

[0128] As an example, electrode terminals 1112 are disposed on the surface of housing 1111 that is away from the bearing surface 21a in a third direction, and connecting member 30 is located on the side of housing 1111 that is away from the bearing surface 21a in a third direction.

[0129] In other embodiments, the electrode terminal 1112 may also be disposed on the surface of the housing 1111 facing the bearing surface 21a in a third direction, and the connecting member 30 is located on the side of the housing 1111 facing the bearing surface 21a in a third direction.

[0130] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0131] As a specific example, a power battery (battery device 100) includes a battery cell (battery unit 111) and a transparent pressure strip (connecting member 30). The transparent pressure strip is attached to the surface of the battery cell, and a light-curing structural adhesive (photocurable structural adhesive) is filled between the contact surfaces of the transparent pressure strip and the battery cell to form an adhesive layer. The light transmittance of the transparent pressure strip is greater than or equal to 50%, and in some embodiments, the light transmittance can be greater than or equal to 80%. The transparent pressure strip is configured such that, after curing, the uniformity of the adhesive layer, the presence of bubbles, and any defects such as adhesive leakage can be visually inspected through it. The photocurable structural adhesive is an acrylic photocurable structural adhesive, which can be one of ultraviolet light curable structural adhesive, visible light curable structural adhesive, or ultraviolet-blue light dual-band curable structural adhesive. The photocurable structural adhesive is liquid before curing, has a shear strength greater than or equal to 2 MPa after curing, and has good adhesive compatibility with both the transparent pressure strip and the surface of the battery cell. The transparent strip is made of polycarbonate (PC) or acrylic (PMMA) with a thickness of 0.5mm-4mm. The surface is free of obvious scratches and impurities, which helps to ensure the transmission efficiency of ultraviolet or visible light and the clarity of visual inspection.

[0132] In the description of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, 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. Furthermore, without contradiction, those skilled in the art can combine different embodiments or examples described in this application, as well as features of different embodiments or examples.

[0133] 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 container has storage space; Multiple battery cell assemblies are disposed within the accommodating space, the multiple battery cell assemblies are arranged along a first direction, and each battery cell assembly includes multiple battery cells arranged along a second direction; At least one connecting member extends along a second direction and is connected to at least two battery cells in at least one of the battery cell assemblies. The connecting member is located on at least one side of the battery cell assembly along a third direction. The first direction, the second direction, and the third direction intersect each other. The light transmittance of the connecting member is greater than or equal to 50% and less than 100%.

2. The battery device according to claim 1, characterized in that, The light transmittance of the connecting component is 80%-95%.

3. The battery device according to claim 1, characterized in that, The battery device includes a spacer that is at least partially located between the battery cell and the connecting member along a third direction.

4. The battery device according to claim 3, characterized in that, The spacer includes an adhesive layer, and the connecting member is bonded to the battery cell assembly through the adhesive layer.

5. The battery device according to claim 1, characterized in that, The connecting component is bonded to the battery cell assembly using a light-cured structural adhesive.

6. The battery device according to claim 5, characterized in that, The photocurable structural adhesive is one of ultraviolet light curable structural adhesive, visible light curable structural adhesive, and ultraviolet-blue light dual-band curable structural adhesive.

7. The battery device according to claim 1, characterized in that, The connecting component is a polycarbonate component or an acrylic component.

8. The battery device according to claim 1, characterized in that, The thickness of the connecting member along the third direction is 0.5mm-4mm.

9. The battery device according to claim 1, characterized in that, The connecting member is connected to any two adjacent battery cell assemblies.

10. The battery device according to claim 1, characterized in that, At least two of the plurality of battery cell assemblies form a battery module, the battery device includes a plurality of the battery modules, and the connecting member is connected to any two adjacent battery modules.

11. The battery device according to claim 10, characterized in that, Within each battery module, the connecting member is connected to any two adjacent battery cell assemblies.

12. The battery device according to claim 10, characterized in that, The battery device includes multiple sets of end plates, each set of end plates being disposed on opposite sides of the corresponding battery module along the second direction.

13. The battery device according to any one of claims 1 to 12, characterized in that, The battery cell includes a housing and electrode terminals. The electrode terminals are disposed on the surface of the housing along a third direction. The surface of the housing along the third direction includes a first shoulder and a second shoulder. The first shoulder and the second shoulder are respectively located on both sides of the electrode terminals. The connecting member is connected to the first shoulder or the second shoulder of at least two battery cells in the battery cell assembly.

14. The battery device according to claim 13, characterized in that, Along the thickness direction of the connecting member, the thickness of the connecting member is less than or equal to the height by which the electrode terminal protrudes from the housing.

15. The battery device according to claim 13, characterized in that, The housing includes a base plate with a bearing surface and a heat exchange medium flow channel inside the base plate, and the plurality of battery cell assemblies are supported on the bearing surface; At least one set of two adjacent battery cell assemblies arranged along the first direction are connected to a connecting member, wherein the first shoulder of the plurality of battery cells in one battery cell assembly is disposed adjacent to the second shoulder of the plurality of battery cells in another battery cell assembly, and the connecting member is simultaneously connected to at least two sets of adjacent first shoulders and second shoulders.

16. An energy storage device, characterized in that, It includes an energy storage box and a battery device as described in any one of claims 1 to 15, wherein the battery device is disposed inside the energy storage box.

17. An energy storage system, characterized in that, include: The energy storage device according to claim 16; An energy storage converter is used to electrically connect the energy storage device and the power generation device.

18. A charging network, characterized in that, include: Charging stations; The energy storage device of claim 16 is electrically connected to the charging pile and is used to provide electrical energy.

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