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

Abstract

The present application relates to a battery device, an energy storage device, an energy storage system, a charging network, and an electric device. The battery device comprises: battery cells, each of the battery cells having grooves on an outer surface thereof; a case, which accommodates the plurality of battery cells therein and comprises a support member for supporting the battery cells, the support member being located on the side of the battery cells having the grooves; and a structural adhesive bonded between the battery cells and the support member, at least part of the structural adhesive being located in the grooves. Due to the arrangement of the grooves, a space for arranging the structural adhesive between the battery cells and the support member is increased, thereby expanding the bonding area of the structural adhesive and enhancing the bonding strength between the battery cells and the support member. In addition, since the structural adhesive may be located in the grooves of the battery cells, when the battery device vibrates or is subjected to other situations that generate a shear force between the battery cells and the support member, movement between the battery cells and the support member can be limited, such that the connection between the battery cells and the support member is firmer, and degumming is less likely to occur.

Description

Battery devices, energy storage devices, energy storage systems, charging networks and electrical appliances Cross-references

[0001] This application incorporates Chinese Patent Application No. 202423215717.6, filed on December 25, 2024, entitled “Battery Device, Energy Storage Device, Energy Storage System, Charging Network and Power Consumption Device”, which is incorporated herein by reference in its entirety. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery device, energy storage device, energy storage system, charging network, and power consumption device. Background Technology

[0003] A battery pack consists of multiple battery cells, which are often fixed to other structures within the pack using structural adhesives. For example, the bottom of a battery cell is bonded to a cooling plate using structural adhesive. However, vibrations or other conditions that cause shear forces between the battery cells and other structures can lead to adhesive detachment, resulting in the failure of the battery cell's fixation. Summary of the Invention

[0004] In view of the problem, this application provides a battery device, energy storage device, energy storage system, charging network, and power consumption device, which can alleviate the problem of delamination caused by structural adhesive bonding of battery cells to other structures.

[0005] In a first aspect, this application provides a battery device, comprising:

[0006] A battery cell, the outer surface of which has grooves;

[0007] A housing containing multiple battery cells, the housing including a support body for supporting the battery cells, and the support body being located on the side of the battery cells having recesses; and

[0008] Structural adhesive is bonded between the battery cell and the carrier, and at least a portion of the structural adhesive is located within the groove.

[0009] By creating grooves on the outer surface of the battery cell and ensuring that the structural adhesive is at least partially located within these grooves when bonding the battery cell to the carrier, the following advantages are achieved: First, the grooves increase the space for the structural adhesive between the battery cell and the carrier, thus expanding the adhesive's bonding range and strengthening the bond between them. Second, because at least a portion of the structural adhesive is located within the grooves of the battery cell, movement between the battery cell and the carrier is restricted when the battery device vibrates or experiences shear forces, resulting in a stronger and less prone-to-detachment connection.

[0010] In some embodiments, structural adhesive fills the entire space within the groove.

[0011] This allows for a tighter connection between the battery cell and the carrier, and the structural adhesive can also form protrusions that match the grooves, thereby more reliably restricting the movement between the battery cell and the carrier.

[0012] In some embodiments, the cross-sectional shape of the groove includes at least one of a rectangle, an arc, a triangle, or a trapezoid.

[0013] When the cross-sectional shape of the groove is any one of rectangle, arc, triangle or trapezoid, it can provide a reliable space for the structural adhesive, thereby strengthening the adhesion between the battery cell and the carrier and restricting the movement between the battery cell and the carrier, making the connection between the battery cell and the carrier more firm and less prone to delamination.

[0014] In some embodiments, the grooves include a plurality of grooves, all of which are spaced apart from each other on the same side surface of the battery cell;

[0015] The structural adhesive is located within multiple grooves.

[0016] Because the battery cell has multiple grooves, the space for structural adhesive can be further expanded, the adhesion between the battery cell and the carrier can be strengthened, and the movement restriction between the battery cell and the carrier can be made more reliable.

[0017] In some embodiments, each groove extends along a first direction, and all grooves are spaced apart from each other along a second direction; the first direction intersects the second direction.

[0018] This design allows for a more regular arrangement of multiple grooves, resulting in a more uniform distribution of structural adhesive within the grooves, which is more conducive to improving the bonding reliability between the battery cell and the carrier.

[0019] In some embodiments, the battery cell includes at least two sets of grooves spaced apart along a first direction, and each set of grooves includes at least two grooves spaced apart from each other along a second direction.

[0020] In this way, multiple sets of grooves spaced along the first direction can be formed on the same side surface of the battery cell, which is equivalent to setting multiple limiting points between the battery cell and the carrier along the first direction, further making the movement restriction between the battery cell and the carrier more reliable.

[0021] In some embodiments, the carrier includes a cooling plate, and structural adhesive is bonded between the battery cell and the cooling plate.

[0022] Compared to other methods of fixing battery cells to the cooling plate, using structural adhesive allows for a tighter connection between the battery cells and the cooling plate, thereby improving the efficiency of heat dissipation through the cooling plate. Furthermore, the recessed design of the battery cells, with at least a portion of the structural adhesive located within these recesses, increases the bonding area between the adhesive and the battery cells, further enhancing the efficiency of heat dissipation from the battery cells to the cooling plate via the adhesive.

[0023] In some embodiments, the structural adhesive includes a thermally conductive structural adhesive, which is bonded between the battery cell and the cooling plate.

[0024] Thermally conductive structural adhesive not only serves to bond battery cells to the cooling plate, but also quickly conducts the heat generated by the battery cells to the cooling plate, thereby rapidly cooling the battery cells.

[0025] In some embodiments, the battery cell includes a housing and a cell assembly disposed within the housing. The housing includes a bottom wall, a portion of which is recessed into the cell assembly to form a groove.

[0026] Because a portion of the bottom wall of the casing is recessed into the cell assembly to form a groove, a raised rib structure is formed at the corresponding groove location below the cell assembly. This raised rib structure guides the electrolyte within the casing to concentrate on the outer periphery of the raised rib structure, preventing large-scale deposition at the bottom of the casing. This reduces electrolyte corrosion at the bottom of the casing and improves the battery's lifespan. Therefore, when a portion of the bottom wall of the casing is recessed into the cell assembly to form a groove, not only is space provided for structural adhesive to ensure a stronger connection between the casing and the carrier, but electrolyte corrosion at the bottom of the casing is also reduced, thus improving the battery's lifespan.

[0027] Secondly, an energy storage device is provided, including the battery device in any of the above embodiments.

[0028] Thirdly, an energy storage system is provided, including a power conversion device and an energy storage device as described in any of the above embodiments, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0029] Fourthly, a charging network is provided, including charging piles and energy storage devices or energy storage systems as described in any of the above embodiments, wherein the energy storage devices are used to provide electrical energy to the charging piles.

[0030] Fifthly, an electrical device is provided, including the battery device in any of the above embodiments.

[0031] The aforementioned energy storage devices, energy storage systems, charging networks, and power-consuming devices, by providing grooves on the outer surface of the battery cells of the battery device, and ensuring that the structural adhesive is at least partially located within the grooves when bonding the battery cells to the carrier, achieve two advantages. First, the grooves increase the space for the structural adhesive between the battery cells and the carrier, thereby expanding the bonding range of the structural adhesive and strengthening the adhesion between the battery cells and the carrier. Second, because at least part of the structural adhesive can be located within the grooves of the battery cells, when the battery device vibrates or is subjected to shear forces between the battery cells and the carrier, the movement between the battery cells and the carrier can be restricted, making the connection between the battery cells and the carrier more secure and less prone to detachment.

[0032] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0034] Figure 1 is a schematic diagram of the structure of an energy storage device according to one or more embodiments.

[0035] Figure 2 is a schematic diagram of an energy storage system according to one or more embodiments.

[0036] Figure 3 is a schematic diagram of a charging network according to one or more embodiments.

[0037] Figure 4 is a schematic diagram of the structure of a battery device according to one or more embodiments.

[0038] Figure 5 is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments.

[0039] Figure 6 is a schematic diagram of a portion of the structure of a battery device according to one or more embodiments.

[0040] Figure 7 is a schematic diagram of the casing of a battery cell according to one or more embodiments.

[0041] Figure 8 is a bottom view of the shell shown in Figure 7.

[0042] Figure 9 is a cross-sectional schematic diagram of the shell shown in Figure 7.

[0043] Figure 10 is an enlarged schematic diagram of part A shown in Figure 9.

[0044] Figure 11 is a cross-sectional schematic diagram of a portion of the battery device described in Figure 7.

[0045] Figure 12 is an enlarged schematic diagram of the local area B shown in Figure 11.

[0046] The reference numerals in the detailed embodiments are as follows:

[0047] Energy storage device 1000, battery device 100, housing 10, first part 11, second part 12, carrier 13, cooling plate 131, battery cell 20, end cap 21, electrode terminal 211, shell 22, groove 221, cell assembly 23, structural adhesive 30, cabinet 200, power conversion device 2000, power generation device 3000, charging pile 4000, connector 5000. Detailed Implementation

[0048] 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.

[0049] 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, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, technical terms such as "first" and "second" 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.

[0051] 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.

[0052] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, 1 and / or 2 can represent: 1 existing alone, 1 and 2 existing simultaneously, and 2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0053] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0054] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 are not intended to 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 the embodiments of this application.

[0055] 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0056] With the continuous development of battery technology, battery devices are being used more and more widely in various fields. At the same time, the performance requirements for battery devices are also becoming increasingly stringent. A battery device consists of multiple battery cells. In order to reliably install the battery cells, they need to be fixedly connected to a carrier, such as a cooling plate, end plate, side plate, or housing.

[0057] Taking a cooling plate as an example, battery devices frequently operate under high energy density and high power discharge conditions, generating a significant amount of heat. To ensure long-term stable operation, a cooling plate is typically installed at the bottom of the battery device for cooling and heat dissipation. Individual battery cells can be bonded to the cooling plate using structural adhesive. This improves the reliability of the cell fixation on the cooling plate and enhances the contact between the cells and the plate, resulting in better cooling performance.

[0058] However, since the battery cell and the cooling plate are fixed only by the adhesive force of the structural adhesive, there is a risk of delamination when the battery device vibrates or is subjected to other conditions that cause shear force between the battery cell and the cooling plate, resulting in the failure of the battery cell fixation.

[0059] Therefore, in order to alleviate the problem of delamination that easily occurs when the battery cell and the battery carrier are bonded together by structural adhesive, this application provides a battery device, including a battery cell, a housing and structural adhesive. The outer surface of the battery cell has a groove, and multiple battery cells are accommodated in the housing. The housing includes a carrier for supporting the battery cells, and the carrier is located on the side of the battery cell with the groove. The structural adhesive is bonded between the battery cell and the carrier, and at least a portion of the structural adhesive is located in the groove.

[0060] Thus, by creating grooves on the outer surface of the battery cell and ensuring that the structural adhesive is at least partially located within these grooves when bonded between the battery cell and the carrier, the following advantages are achieved: First, the grooves increase the space for the structural adhesive between the battery cell and the carrier, thereby expanding the adhesive's bonding range and strengthening the bond between them. Second, because at least a portion of the structural adhesive is located within the grooves of the battery cell, movement between the battery cell and the carrier is restricted when the battery device vibrates or experiences shear forces, resulting in a stronger connection that is less prone to detachment.

[0061] The battery device provided in this application embodiment can be used in energy storage devices, energy storage systems, and charging networks, and can also be used in electrical devices such as mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0062] The following is a description of the energy storage device, energy storage system, and charging network in the embodiments of this application.

[0063] Referring to Figure 1, this application embodiment provides an energy storage device 1000, including one or more battery clusters to improve the voltage and capacity of the energy storage device 1000. The battery cluster may include multiple battery devices 100, which are connected in series via a busbar to increase the voltage of the energy storage device 1000. When the energy storage device 1000 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 1000. Details of the battery devices 100 are provided below.

[0064] The energy storage device 1000 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 1000 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 1000 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires the energy storage device 1000.

[0065] In some embodiments, the energy storage device 1000 is an energy storage container or an energy storage cabinet.

[0066] In some embodiments, the energy storage device 1000 may include a cabinet 200 and one or more battery clusters, the battery clusters being housed in the cabinet 200.

[0067] In some embodiments, the energy storage device 1000 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0068] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via piping to regulate the temperature of the individual battery cells 20.

[0069] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0070] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as the Insulation Monitoring Module (IMM), the Master Battery Management Unit (MBMU), the Ethernet (ETH) module, and the fiber optic conversion module.

[0071] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0072] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0073] Referring to Figure 2, in some embodiments, the energy storage system may include one or more energy storage devices 1000 and a power conversion system (PCS) 2000, which is connected between the power generation device 3000 and the energy storage device 1000. The power generation device 3000 generates electrical energy, which can be stored in the energy storage device 1000 via the power conversion system 2000, and the electrical energy stored in the energy storage device 1000 can be released back to the power generation device 3000 via the power conversion system 2000. As an example, the power generation device 3000 may specifically be a power grid, solar panels, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc. The specific type of the power generation device 3000 is not limited in this application.

[0074] Referring to Figure 3, this embodiment of the application provides a charging network including a charging pile 4000 and an energy storage device 1000. The charging pile 4000 is electrically connected to the energy storage device 1000, which provides electrical energy to the charging pile 4000. The charging pile 4000 is electrically connected to a battery device 100 in the energy storage device 1000 via a cable, and the battery device 100 can provide its stored electrical energy to the charging pile 4000. The charging pile 4000 has one or more connectors 5000 for connecting to an electrical device (such as a vehicle) to replenish its power. The definition of the battery device 100 is detailed below.

[0075] The energy storage device 1000 can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0076] Please refer to Figure 4, which is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space. Alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0077] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0078] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0079] Please refer to Figure 5, which is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. A battery cell 20 refers to the smallest unit that makes up a battery. As shown in Figure 5, the battery cell 20 includes an end cap 21, a housing 22, a cell assembly 23, and other functional components.

[0080] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on end cap 21. Electrode terminals 211 can be used for electrical connection with cell assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0081] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the cell assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the cell assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0082] The cell assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more cell assemblies 23. The cell assembly 23 mainly consists of positive and negative electrode materials, a separator, and a current collector. Specifically, positive electrode material is coated onto the battery output terminal connector to form a positive electrode sheet, and negative electrode material is coated onto the battery output terminal connector to form a negative electrode sheet. The positive and negative electrode sheets are wound or stacked, and the separator is disposed between the positive and negative electrode sheets, thus forming the cell assembly 23. The portions of the positive and negative electrode sheets containing active material constitute the main body of the cell assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0083] Referring to Figures 6-12, this application provides a battery device 100, including a battery cell 20, a housing 10, and structural adhesive 30. The outer surface of the battery cell 20 has a groove 221. Multiple battery cells 20 are accommodated within the housing 10. The housing 10 includes a support 13 for supporting the battery cells 20, and the support 13 is located on the side of the battery cell 20 with the groove 221. The structural adhesive 30 is bonded between the battery cell 20 and the support 13, and at least a portion of the structural adhesive 30 is located within the groove 221.

[0084] The groove 221 on the outer surface of the battery cell 20 can be formed on the housing 22 of the battery cell 20. The groove 221 can be a groove 221 with only one opening, formed by the bottom wall of the groove and multiple end-to-end groove side walls, or a groove 221 with multiple openings, defined by a bottom wall of the groove and at least one groove wall. The groove 221 can be formed by stamping the side wall of the housing 22, or it can be formed by fixing additional ribs to the outside of the side wall of the housing 22.

[0085] In this embodiment, the support 13 supports the battery cell 20. The support 13 can be located below or above the battery cell 20 to suspend and support it. The support 13 can be part of the housing 10, for example, the support 13 can be the bottom wall of the housing 10. The support 13 can also be other structures placed within the housing 10 that provide reliable support for the battery cell 20. The housing 10 can include the first part 11 and the second part 12 mentioned above, and is a major component forming the accommodating space for the battery cell 20.

[0086] The structural adhesive 30 serves to stably connect the battery cell 20 to the carrier 13. The structural adhesive 30 can be a high-strength adhesive, such as acrylic structural adhesive, polyurethane structural adhesive, epoxy structural adhesive, or other structural adhesives that meet the usage requirements of the battery device 100. Before connecting the battery cell 20 to the carrier 13, liquid structural adhesive 30 can be applied to the surface of either the carrier 13 or the battery cell 20, allowing them to bond through the cured adhesive 30. Alternatively, the structural adhesive 30 can be made into an adhesive strip and placed at corresponding positions on the battery cell 20 and the carrier 13 for bonding. Another option is a combination of liquid structural adhesive 30 and adhesive strips.

[0087] Thus, by providing a groove 221 on the outer surface of the battery cell 20, and ensuring that the structural adhesive 30 is at least partially located within the groove 221 when bonded between the battery cell 20 and the carrier 13, on the one hand, the groove 221 increases the space for the structural adhesive 30 between the battery cell 20 and the carrier 13, thereby expanding the bonding range of the structural adhesive 30 and strengthening the adhesion between the battery cell 20 and the carrier 13. On the other hand, since at least a portion of the structural adhesive 30 can be located within the groove 221 of the battery cell 20, when the battery device 100 vibrates or is subjected to other conditions that cause shear force between the battery cell 20 and the carrier 13, the movement between the battery cell 20 and the carrier 13 can be restricted, making the connection between the battery cell 20 and the carrier 13 more secure and less prone to detachment.

[0088] As shown in Figure 12, according to some embodiments of this application, structural adhesive 30 fills the entire space within the groove 221.

[0089] When the structural adhesive 30 fills the entire space within the groove 221, it can form a tight contact with the groove walls, including the sidewalls and bottom wall. This allows for a tighter connection between the battery cell 20 and the carrier 13, and the structural adhesive 30 can also form protrusions that match the groove 221, thereby more reliably restricting movement between the battery cell 20 and the carrier 13.

[0090] Specifically, before the battery cell 20 is connected to the carrier 13, a certain thickness of liquid structural adhesive 30 can be coated on the surface of the carrier 13 or the battery cell 20. When the carrier 13 and the battery cell 20 are pressed and bonded, some of the liquid structural adhesive 30 can flow into the groove 221 under pressure, and after curing, it can fill the groove 221.

[0091] As shown in Figure 10, according to some embodiments of this application, the cross-sectional shape of the groove 221 includes at least one of a rectangle, an arc, a triangle, or a trapezoid.

[0092] The cross-sectional shape of the groove 221 refers to the cross-sectional shape taken from the width and depth directions parallel to the groove 221.

[0093] When the cross-sectional shape of the groove 221 is any one of rectangle, arc, triangle or trapezoid, it can provide a reliable space for the structural adhesive 30, thereby strengthening the adhesion between the battery cell 20 and the carrier 13, and restricting the movement between the battery cell 20 and the carrier 13, making the connection between the battery cell 20 and the carrier 13 more firm and less prone to delamination.

[0094] Referring to Figures 7 to 9, according to some embodiments of this application, the groove 221 includes a plurality of grooves, all of which are spaced apart from each other on the same side surface of the battery cell 20, and the structural adhesive 30 is located within the plurality of grooves 221.

[0095] Because the battery cell 20 is provided with multiple grooves 221, the space for the structural adhesive 30 can be further expanded, the adhesion between the battery cell 20 and the carrier 13 is strengthened, and the movement restriction between the battery cell 20 and the carrier 13 is more reliable.

[0096] In some specific embodiments, each groove 221 extends along the first direction X, and all grooves 221 are spaced apart from each other along the second direction Y, with the first direction X intersecting the second direction Y.

[0097] The first direction X can be perpendicular to the second direction Y. The first direction X can be the length direction of the battery cell 20, and the second direction Y can be the width direction of the battery cell 20.

[0098] This arrangement allows for a more regular arrangement of the multiple grooves 221, resulting in a more uniform distribution of the structural adhesive 30 within the grooves 221, which is more conducive to improving the bonding reliability between the battery cell 20 and the carrier 13.

[0099] Referring to Figures 7 to 9, according to some embodiments of this application, the battery cell 20 includes at least two sets of grooves 221 spaced apart along a first direction X, and each set of grooves 221 includes at least two grooves spaced apart from each other along a second direction Y.

[0100] Thus, multiple sets of grooves 221 spaced along the first direction can be formed on the same side surface of the battery cell 20, which is equivalent to setting multiple limiting points between the battery cell 20 and the carrier 13 along the first direction X, further making the movement restriction between the battery cell 20 and the carrier 13 more reliable.

[0101] Specifically, the battery cell 20 includes two sets of grooves 221 spaced apart along a first direction X, and each set of grooves 221 includes four grooves spaced apart from each other along a second direction Y. In other embodiments, the battery cell 20 may also have three or four sets of grooves 221, with each set of grooves 221 including two, three, five, etc.

[0102] Please refer to Figure 6. According to some embodiments of this application, the carrier 13 includes a cooling plate 131, and structural adhesive 30 is bonded between the battery cell 20 and the cooling plate 131.

[0103] Cooling plate 131 can be disposed at the bottom of multiple battery cells 20 and extend along the stacking direction of the multiple battery cells 20, and its shape can be rectangular. Cooling plate 131 can be a liquid cooling plate, which refers to a component that transfers heat by circulating liquid. Specifically, the liquid cooling plate has coolant channels inside for coolant to flow through. Heat transfer is achieved by the flow of coolant within the coolant channels. The coolant can be water or oil. Cooling plate 131 can be integrated into the bottom of the housing body to reduce the weight of the housing 10.

[0104] Compared to other methods of fixing the battery cell 20 to the cooling plate 131, the use of structural adhesive 30 allows for a tighter connection between the battery cell 20 and the cooling plate 131, thereby improving the efficiency of heat dissipation from the battery cell 20 through the cooling plate 131. Furthermore, the recess 221 of the battery cell 20, with at least a portion of the structural adhesive 30 located within the recess 221, increases the bonding area between the structural adhesive 30 and the battery cell 20, further enhancing the efficiency of heat dissipation from the battery cell 20 to the cooling plate 131 via the structural adhesive 30.

[0105] According to some embodiments of this application, the structural adhesive 30 includes a thermally conductive structural adhesive, which is bonded between the battery cell 20 and the cooling plate.

[0106] The thermally conductive structural adhesive not only serves to bond the battery cell 20 to the cooling plate 131, but also quickly conducts the heat generated by the battery cell 20 to the cooling plate 131, thereby rapidly cooling the battery cell 20.

[0107] Thermally conductive structural adhesive is a colloidal material with high thermal conductivity and low thermal resistance. Specifically, it can be silicone, epoxy resin, polyurethane, or other thermally conductive structural adhesives that meet the usage conditions of battery device 100.

[0108] Referring to Figures 9 and 10, according to some embodiments of this application, the battery cell 20 includes a housing 22 and a cell assembly 23 disposed within the housing 22. The housing 22 includes a bottom wall, and a portion of the bottom wall is recessed into the cell assembly 23 to form a groove 221.

[0109] The bottom wall of the housing 22 refers to the wall that is at the lowest point in the vertical direction after the battery cell 20 is installed. Normally, the bottom wall of the housing 22 is positioned opposite to the end cap 21.

[0110] Because a portion of the bottom wall of the housing 22 is recessed into the cell assembly 23 to form a groove 221, a rib structure is formed at the corresponding groove 221 of the housing 22, located below the cell assembly 23. This rib structure guides the electrolyte inside the housing 22 to concentrate on the outer periphery of the rib structure, preventing large-scale deposition at the bottom of the housing 22. This reduces electrolyte corrosion at the bottom of the housing 22 and improves the service life of the battery device 100. Simultaneously, when the bottom wall of the housing 22 is equipped with an explosion-proof valve for thermal runaway of the battery cell 20, the rib structure can also support the cell assembly 23, creating a gap between the cell assembly 23 and the bottom of the housing 22. This forms a venting channel connected to the explosion-proof valve, further improving the reliability of the battery device 100.

[0111] Therefore, when a groove 221 is formed by recessing part of the bottom wall of the housing 22 into the cell assembly 23, it not only provides space for the structural adhesive 30 to be installed so that the connection between the housing 22 and the carrier 13 is stronger, but also reduces the corrosion of the bottom of the housing 22 by the electrolyte and forms an venting channel, thereby improving the service life and reliability of the battery device 100.

[0112] According to some embodiments of this application, referring to Figures 6 to 12, a battery device 100 is provided, including a battery cell 20, a housing 10, and structural adhesive 30. The housing 10 includes a water-cooling plate 131. The bottom of the battery cell 20 has a plurality of grooves 221. Each groove 221 is formed by recessing into the cell assembly 23 through a portion of the bottom wall of the housing 22 of the battery cell 20. The structural adhesive 30 is bonded between the battery cell 20 and the cooling plate 131 and fills all the space within the plurality of grooves 221.

[0113] In addition, this application also provides an energy storage device 1000, which includes the battery device 100 in any of the above embodiments.

[0114] This application also provides an energy storage system, including a power conversion device 2000 and an energy storage device 1000 in any of the above embodiments. The power conversion device 2000 is used to electrically connect the power generation device 3000 and the energy storage device 1000.

[0115] This application also provides a charging network, including a charging pile and an energy storage device 1000 or energy storage system as described in any of the above embodiments. The energy storage device 1000 is used to provide power to the charging pile.

[0116] This application also provides an electrical device, including the battery device 100 in any of the above embodiments.

[0117] The energy storage device 1000, energy storage system, charging network, and power consumption device described above, by providing a groove 221 on the outer surface of the battery cell 20 and ensuring that the structural adhesive 30 is at least partially located within the groove 221 when bonded between the battery cell 20 and the carrier 13, have several advantages. Firstly, the groove 221 increases the space for the structural adhesive 30 between the battery cell 20 and the carrier 13, thus expanding the bonding range of the structural adhesive 30 and strengthening the adhesion between them. Secondly, since at least a portion of the structural adhesive 30 is located within the groove 221 of the battery cell 20, when the battery device 100 vibrates or experiences other conditions that cause shear force between the battery cell 20 and the carrier 13, the movement between them can be restricted, resulting in a stronger connection between the battery cell 20 and the carrier 13 and preventing detachment.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, wherein, include: A battery cell, wherein the outer surface of the battery cell has grooves; A housing, in which a plurality of the battery cells are housed, the housing including a support body for supporting the battery cells, and the support body being located on the side of the battery cell having the groove; as well as Structural adhesive is bonded between the battery cell and the carrier, and at least a portion of the structural adhesive is located within the groove.

2. The battery device according to claim 1, wherein, The structural adhesive fills all the space within the groove.

3. The battery device according to claim 1 or 2, wherein, The cross-sectional shape of the groove includes at least one of rectangle, arc, triangle or trapezoid.

4. The battery device according to any one of claims 1 to 3, wherein, The grooves include multiple grooves, and all of the grooves are spaced apart from each other on the same side surface of the battery cell; The structural adhesive is located within the plurality of grooves.

5. The battery device according to claim 4, wherein, Each of the grooves extends along a first direction, and all the grooves are spaced apart from each other along a second direction; the first direction intersects the second direction.

6. The battery device according to claim 5, wherein, The battery cell includes at least two sets of grooves spaced apart along the first direction, and each set of grooves includes at least two grooves spaced apart from each other along the second direction.

7. The battery device according to any one of claims 1 to 6, wherein, The carrier includes a cooling plate, and the structural adhesive is bonded between the battery cell and the cooling plate.

8. The battery device according to claim 7, wherein, The structural adhesive includes a thermally conductive structural adhesive, which is bonded between the battery cell and the cooling plate.

9. The battery device according to any one of claims 1 to 8, wherein, The battery cell includes a housing and a cell assembly disposed within the housing. The housing includes a bottom wall, and a portion of the bottom wall is recessed into the cell assembly to form the groove.

10. An energy storage device, wherein, Includes the battery device as described in any one of claims 1 to 9.

11. An energy storage system, wherein, It includes a power conversion device and an energy storage device as described in claim 10, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

12. A charging network, wherein, It includes a charging pile and an energy storage device as described in claim 10 or an energy storage system as described in claim 11, wherein the energy storage device is used to provide electrical energy to the charging pile.

13. An electrical appliance, wherein, Includes the battery device as described in any one of claims 1 to 9.

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