Battery device and energy storage system

Abstract

The utility model discloses a battery device and an energy storage system. The battery device comprises a battery monomer, an end plate, a limiting assembly and a positioning assembly, the end plate is connected to one side of the battery monomer along the first direction; a first through hole penetrating along the first direction is formed in the end plate; the limiting assembly comprises a main body part arranged on one side of the single battery along the second direction and a bent part bent from the main body part to the direction of the end plate, and the second direction is vertical to the first direction. The positioning assembly comprises a positioning piece and a fastening piece, the positioning piece is connected to the end plate, a second through hole coaxial with the first through hole is formed in the positioning piece, and a third through hole coaxial with the second through hole is formed in the bent part. The fastening piece penetrates through the first through hole, the third through hole and the second through hole to fixedly connect the limiting assembly, the positioning piece and the end plate. According to the technical scheme, the application range of the limiting assembly in the battery device can be widened, and the assembling efficiency of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery device and an energy storage system. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, such as in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric tools, etc.

[0003] Currently, to adapt to energy storage systems with varying structural shapes, the battery device structure also needs to be flexible. However, the fixed structure of the end plates and connecting straps in battery devices prevents flexible application, has poor adaptability, and suffers from low assembly efficiency. Therefore, improvements are needed to address these issues. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an energy storage system, which can increase the application range of the limiting component in the battery device and improve the efficiency of battery device assembly.

[0005] In a first aspect, the present application provides a battery device comprising a battery cell, an end plate, a limiting assembly and a positioning assembly. The end plate is connected to one side of the battery cell along a first direction, and a first through hole is provided on the end plate that passes through the first direction. The limiting assembly comprises a main body provided on one side of the battery cell along a second direction and a bent portion bent from the main body toward the end plate, wherein the second direction is perpendicular to the first direction. The positioning assembly comprises a positioning member and a fastener, the positioning member is connected to the end plate, the positioning member is provided with a second through hole coaxial with the first through hole, and the bent portion is provided with a third through hole coaxial with the second through hole. The fastener passes through the first through hole, the third through hole and the second through hole to fix the limiting assembly, the positioning member and the end plate.

[0006] In the technical solution of the embodiment of the present application, the end plate limits the battery cell and restricts the movement of the battery cell along the first direction. The limiting assembly connects the two end plates and can connect the battery cells into groups together with the end plates, thereby improving the connection strength of the battery cells, facilitating the installation and fixation of the battery cells and the electrical connection structure, and improving the operational stability of the battery device. In addition, the bent portion of the limiting assembly extends to one side of the end plate, thereby improving the strength and stability of the connection with the end plate. The positioning member is provided on the end plate, and a first through hole is provided on the end plate, which can be stably connected to the positioning member and the limiting assembly by a fastener, thereby improving the strength of the connection. As long as the first through hole is provided on the end plate, the positioning member and the limiting assembly can be fixed. The combination of the limiting assembly and the positioning member becomes an end plate suitable for various specifications and shapes, and can fix battery cells of different structures and shapes. Therefore, the above technical solution improves the scope of application of the end plate assembly, improves the assembly efficiency of the battery device, and also improves the stability of the battery device during operation.

[0007] In some embodiments, the end surface of the end plate along the first direction is provided with a mounting groove, and the positioning member is provided in the mounting groove. In the above structure, by providing the mounting groove, the accuracy of the positioning member installation position and the assembly efficiency are improved.

[0008] In some embodiments, the positioning member further comprises a threaded sleeve, which passes through the second through hole, the third through hole, and the first through hole and is connected to the positioning member, the stop assembly, and the end plate. The fastener is a connecting bolt, which passes through the threaded sleeve to securely connect the stop assembly to the positioning member and the end plate. In the above technical solution, the provision of the threaded sleeve improves the connection strength and stability of the fastener to the positioning member, the stop assembly, and the end plate.

[0009] In some embodiments, the surface of the positioning member facing the mounting groove is provided with an adhesive layer, which fixes the positioning member in the mounting groove. In the above structure, by providing the adhesive layer, the positioning member can be pre-positioned and the connection strength between the positioning member and the end plate is improved.

[0010] In some embodiments, the positioning member extends from one end near the main body to form a snap-fit portion. The projected dimension of the snap-fit portion in the first direction exceeds the thickness dimension of the end plate, thereby forming a limited fit with the end surface of the end plate in the second direction. In the above structure, the provision of the snap-fit portion effectively improves the assembly accuracy and efficiency of the positioning assembly.

[0011] In some embodiments, a weight-reducing groove is provided on the side of the clamping portion facing the battery cell. The above structure reduces the weight of the positioning member and improves the energy density of the battery device.

[0012] In some embodiments, the engaging portion includes at least two protrusions spaced apart along the third direction. A retaining groove is formed between adjacent protrusions. The retaining assembly partially engages within the retaining groove to constrain displacement of the retaining assembly in the third direction, which is perpendicular to both the first and second directions. This structure, by providing the protrusions, restricts movement of the retaining assembly relative to the end plate in the third direction, thereby improving the accuracy of the retaining assembly's installation position.

[0013] In some embodiments, the protrusion is located on a side of the engaging portion facing away from the battery cell, and the bent portion is located within a corresponding retaining groove. This structure positions the side of the end plate where the protrusion is located closer to the first through-hole, thereby reducing the risk of twisting during installation of the retaining assembly and improving installation efficiency.

[0014] In some embodiments, the limiting assembly includes two limiting bars spaced apart along the third direction, and the positioning member is provided with two corresponding second through holes, each limiting bar engaging with a corresponding second through hole on the positioning member. In the above structure, the provision of two limiting bars further enhances the strength of the battery cell's position.

[0015] In some embodiments, two partitions are provided within the mounting groove, dividing the mounting groove into a first groove, a second groove, and a third groove along the third direction. The positioning member includes a first positioning portion provided in the first groove, a buffer portion provided in the second groove, and a second positioning portion provided in the third groove. In this structure, the partitions within the mounting groove enhance the structural strength of the mounting groove. The buffer portion is provided on the positioning member to absorb the compressive force of the first and second positioning portions.

[0016] In some embodiments, the clamping portion, the first positioning portion, the buffer portion, and the second positioning portion are manufactured using an integrated molding process to form a monolithic structure. In this structure, the integrated molding process improves the structural strength between the clamping portion, the first positioning portion, the buffer portion, and the second positioning portion, and improves the stability of the positioning member installation.

[0017] In some embodiments, the positioning member includes a support plate and a support ring. The support plate is provided with a second through hole, is disposed opposite the end plate, and has an adhesive layer disposed on a surface of the support plate facing the end plate. The support ring is disposed on a surface of the support plate facing away from the adhesive layer. The above structure, by providing the support plate, increases the area for the second through hole, and the support ring enhances the structural strength of the support plate, improves the connection stability between the positioning member and the fastener, and thereby improves the installation stability of the limit assembly.

[0018] In some embodiments, a fourth through hole coaxial with the second through hole is provided in the support ring, and the threaded sleeve extends axially and passes through the fourth through hole. In the above structure, the fourth through hole increases the connection area between the fastener and the positioning member and improves the connection strength.

[0019] In some embodiments, the outer peripheral wall of the support ring is provided with a reinforcing rib extending along the first direction, and one end of the reinforcing rib is rigidly connected to the support plate. By providing the reinforcing rib, the structural strength of the support ring is improved.

[0020] In a second aspect, the present application provides an energy storage system, which includes the battery device in the above embodiment and a heat exchange component, wherein the heat exchange component is used to exchange heat with battery cells in the battery device.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0023] Figure 1 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0024] Figure 2 A schematic diagram of an exploded structure of a battery device provided in some embodiments of the present application;

[0025] Figure 3 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application;

[0026] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part A;

[0027] Figure 5 A schematic structural diagram of an end plate and a positioning member provided in some embodiments of the present application;

[0028] Figure 6 Schematic diagram of a partial structure of a battery device provided in some other embodiments of the present application;

[0029] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of part B;

[0030] Figure 8 A schematic diagram of the structure of a positioning member provided in some embodiments of the present application;

[0031] Figure 9 A schematic structural diagram of a positioning member provided in some other embodiments of the present application;

[0032] Figure 10 for Figure 5 Schematic diagram of the enlarged structure of part C.

[0033] DETAILED DESCRIPTION OF THE REFERENCE NUMERALS

[0034] 1. Energy storage system; 2. Battery device; 3. Heat exchange assembly; 4. Control unit; 5. Housing; 5a. First housing portion; 5b. Second housing portion; 5c. Accommodation space; 6. Battery cell; 7. End plate; 701. First through hole; 702. Mounting groove; 703. Partition plate; 704. First slot; 705. Second slot; 706. Third slot; 8. Positioning assembly; 801. Main body; 802. Bend portion; 803. Third through hole; 9. Positioning member; 901. Second through hole; 902. Threaded sleeve; 903. Clamping portion; 904. Weight reduction slot; 906, convex portion; 907, limiting groove; 908, first positioning portion; 909, buffer portion; 910, second positioning portion; 911, support plate; 912, support ring; 913, fourth through hole; 914, reinforcing rib; 11, fastener; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0038] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0040] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0041] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present 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 and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0043] In this application, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0044] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0045] In the embodiments of this application, "parallel" includes not only absolute parallelism but also approximately parallelism as commonly understood in engineering practice. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximately perpendicularity as commonly understood in engineering practice. For example, if the angle between two directions is 85°-95°, they are considered perpendicular; if the angle between two directions is 0°-5°, they are considered parallel.

[0046] The term "plurality" used in this application refers to two or more (including two).

[0047] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0048] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0049] During battery cell operation, the accumulation of structural stress caused by the insertion and extraction of lithium ions, as well as the generation of gases from electrolyte decomposition, can cause deformation of the battery cells. Therefore, the battery assembly requires limiting components, such as steel straps and binding tape, to limit deformation. However, existing steel straps are directly attached to the top of the battery cells, resulting in insufficient height clearance and mounting stability. Furthermore, the connection position between the steel strap and the end plate must change with the shape and specifications of the battery cells, resulting in poor applicability and reduced production efficiency.

[0050] In view of this, the present application provides a battery device, in which the end plate limits the battery cell and restricts the movement of the battery cell along the first direction. The limiting assembly is connected to the end plate, and can connect the battery cells into groups together with the end plate, thereby improving the connection strength between the battery cells, facilitating the installation and fixation of the battery cells and the electrical connection structure, and improving the operational stability of the battery device. In addition, the bent portion of the limiting assembly extends to one side of the end plate, thereby improving the strength and stability of the connection with the end plate. The positioning member is provided on the end plate, and a first through hole is provided on the end plate, which can be stably connected to the positioning member and the limiting assembly by a fastener, thereby improving the strength of the connection. As long as the first through hole is provided on the end plate, the positioning member and the limiting assembly can be fixed. The combination of the limiting assembly and the positioning member becomes an end plate suitable for various specifications and shapes, and can fix battery cells of different structures and shapes. Therefore, the above technical solution improves the scope of application of the end plate assembly, improves the assembly efficiency of the battery device, and also improves the stability of the battery device during operation.

[0051] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0052] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0053] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with a cable tie.

[0054] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0055] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0056] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0057] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0058] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0059] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0060] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0061] Figure 1 A schematic diagram of the structure of the energy storage system provided in some embodiments of the present application.

[0062] As shown in Figure 1 , each energy storage system 1 includes a battery device 2 and a heat exchange assembly 3. The battery device 2 includes a housing and battery cells housed within the housing. Optionally, the heat exchange assembly 3 can be disposed within the housing of the battery device 2 to improve heat exchange efficiency with the battery cells.

[0063] Illustratively, the heat exchange assembly 3 may include a plurality of circulation pipelines, and the circulation pipelines are used to accommodate a heat exchange medium. The heat exchange medium can flow in the heat exchange pipelines to increase or decrease the temperature of the battery cells.

[0064] Optionally, the heat exchange assembly 3 also includes a thermal management device for regulating the operating temperature of the battery cells. This device precisely regulates the operating temperature of the battery cells by monitoring the real-time temperature of the battery cells, controlling the temperature of the heat exchange medium, and controlling the flow rate of the heat exchange medium within the circulation pipeline. Exemplarily, the temperature control assembly may include a compressor, condenser, fan, expansion valve, plate heat exchanger, positive temperature coefficient (PTC) heater, and water pump.

[0065] Furthermore, the energy storage system may also include a control unit 4 for controlling the thermal management device so that the thermal management device regulates the temperature of the battery cells. The control unit 4 may be a device already present in the energy storage system, such as a battery management system (BMS). Alternatively, the control unit may be a device added to the energy storage system.

[0066] Exemplarily, the control unit 4 may be a central processing unit (CPU), which may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0067] In some embodiments, when the battery cells are being charged and discharged, the control unit 4 may control the thermal management device to adjust the temperature of the battery cells.

[0068] Figure 2 Schematic diagram of the explosion of the battery provided in some embodiments of the present application. Figure 2As shown, the battery device 2 includes a housing 5 and a battery cell 6, wherein the battery cell 6 is accommodated in the housing 5. The battery cell 6 may be the smallest unit constituting the battery.

[0069] The housing 5 is used to house the battery cells 6 and can have various structures. In some embodiments, the housing 5 can include a first housing portion 5a and a second housing portion 5b. The first housing portion 5a and the second housing portion 5b overlap each other and together define a storage space 5c for the battery cells 6. The second housing portion 5b can be a hollow structure with one end open. The first housing portion 5a is a plate-like structure, and the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. Alternatively, both the first housing portion 5a and the second housing portion 5b can be hollow structures with one end open, and the open side of the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. Of course, the first housing portion 5a and the second housing portion 5b can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0070] In order to improve the sealing performance after the first box body portion 5a and the second box body portion 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body portion 5a and the second box body portion 5b.

[0071] Assuming that the first box portion 5a covers the top of the second box portion 5b, the first box portion 5a can also be called an upper box cover, and the second box portion 5b can also be called a lower box.

[0072] In the battery device 2 , there can be one or more battery cells 6 . If there are multiple battery cells 6 , the multiple battery cells 6 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 6 are connected in both series and parallel.

[0073] Multiple battery cells 6 can be directly connected in series, parallel, or mixed together, and then the whole formed by multiple battery cells 6 can be accommodated in the box 5; of course, multiple battery cells 6 can also be first connected in series, parallel, or mixed together to form a battery module, and then multiple battery modules can be connected in series, parallel, or mixed together to form a whole and accommodated in the box 5.

[0074] Please refer to Figures 2 to 4 , Figure 2 Schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application, Figure 3 Schematic diagram of the explosion structure of a battery cell provided in some embodiments of the present application, Figure 3 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application. Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part A.

[0075] As shown in the figure, the battery device 2 provided in an embodiment of the present application includes a battery cell 6, an end plate 7, a limiting assembly 8, and a positioning assembly. The end plate 7 is provided on one side of the battery cell 6 along a first direction X, and is provided with a first through hole 701 extending along the first direction X. The limiting assembly 8 includes a main body 801 provided on one side of the battery cell 6 along a second direction Y, and a bent portion 802 bent from the main body 801 toward the end plate 7. The second direction Y is perpendicular to the first direction X. The positioning assembly includes a positioning member 9 and a fastener 11. The positioning member 9 is connected to the end plate 7. The positioning member 9 is provided with a second through hole 901 coaxial with the first through hole 701, and the bent portion 802 is provided with a third through hole 803 coaxial with the second through hole 901. The fastener 11 passes through the first through hole 701, the third through hole 803, and the second through hole 901 to securely connect the limiting assembly 8, the positioning member 9, and the end plate 7.

[0076] The end plate 7 serves as the end support of the battery cell 6 group, and provides a connection point for the fastener 11 through the first through hole 701. The standardized design reduces the dependence on the shape of the end plate 7. Optionally, there are two end plates 7, and the two end plates 7 are respectively arranged on both sides of the battery cell 6 along the first direction X. The main body 801 of the limiting assembly 8 fixes the battery pack along the second direction Y, and the bent portion 802 extends to the side of the end plate 7 and cooperates with the fastener 11 through the third through hole 803 to enhance structural stability while adapting to different specifications of the end plate 7. Exemplarily, the first direction X can be the thickness direction of the battery cell 6, and the second direction Y can be the height direction of the battery cell 6.

[0077] The positioning member 9 is independent of the end plate 7. The second through hole 901 is coaxially designed with the first through hole 701 of the end plate 7. Only the fastener 11 is required to achieve connection with the limiting assembly 8. The positioning member 9 can be customized to adapt to a variety of end plates 7 without changing the main structure of the end plate 7, which significantly improves the versatility of the assembly. The limiting assembly 8 and the end plate 7 form a closed-loop constraint, which effectively limits the displacement of the battery cell 6 in the first direction X and the second direction Y, reducing the risk of structural failure caused by vibration or expansion. The bent portion 802 fits the side of the end plate 7 to expand the contact area, disperse stress, and avoid local overload. The positioning member 9 is decoupled from the limiting assembly 8. The end plate 7 only needs to reserve the first through hole 701, and can adapt to different battery pack requirements by replacing the positioning member 9, reducing mold opening costs. The positioning member 9 assists the limiting assembly 8 in accurately aligning the through holes, simplifying the assembly process and reducing human errors.

[0078] In the technical solution of the embodiments of the present application, multiple battery cells 6 are provided in the battery device 2, which can increase the power supply voltage and improve battery life. The end plate 7 positions the battery cells 6, restricting their movement along a first direction X. The limiting assembly 8 is connected to the end plate 7 and, together with the end plate 7, can group the battery cells 6 together, improving the connection strength between the battery cells 6, facilitating the installation and fixation of the battery cells 6 to the electrical connection structure, and enhancing the operational stability of the battery device 2. Furthermore, the bent portion 802 of the limiting assembly 8 extends to one side of the end plate 7, enhancing the strength and stability of the connection with the end plate 7. A positioning member 9 is provided on the end plate 7, and a first through-hole 701 is provided in the end plate 7. Fasteners 11 can be used to securely connect the positioning member 9 and the limiting assembly 8, improving the strength of the connection. Simply providing the first through-hole 701 in the end plate 7 allows the positioning member 9 and the limiting assembly 8 to be secured. The combination of the limiting assembly 8 and the positioning member 9 creates an end plate 7 suitable for various specifications and shapes, capable of securing battery cells 6 of varying structures and shapes. Therefore, the above technical solution expands the applicable scope of the end plate 7 assembly and improves the assembly efficiency of the battery device 2.

[0079] like Figure 5 As shown, in some embodiments of the present application, an installation groove 702 is provided on the end surface of the end plate 7 along the first direction X, and the positioning member 9 is provided in the installation groove 702 .

[0080] The mounting groove 702 provides a three-dimensional spatial constraint for the locating member 9, reducing the risk of planar displacement and warping of the locating member 9 on the surface of the end plate 7, and narrowing the alignment tolerance of the fastener 11 hole. The groove profile is asymmetrically matched to the outer edge of the locating member 9, preventing assembly errors and reducing rework. Operators can quickly insert the locating member 9 into the groove without visually aligning the fastening holes, shortening single-station assembly time. The groove provides a gripping reference surface for the robot, and in conjunction with the visual positioning system, it enables fully automated screw locking, improving line speed.

[0081] In the above structure, by providing the installation groove 702 , the accuracy of the installation position of the positioning member 9 and the assembly efficiency are improved.

[0082] like Figures 5 to 7 As shown, in some embodiments of the present application, the positioning member 9 also includes a threaded sleeve 902, which passes through the second through hole 901, the third through hole 803 and the first through hole 701 and is connected to the positioning member 9, the limiting assembly 8 and the end plate 7. The fastener 11 is a connecting bolt, which passes through the threaded sleeve 902 to fix the limiting assembly 8 to the positioning member 9 and the end plate 7.

[0083] Threaded sleeve 902 provides an independent threaded channel, increasing the number of engagement turns and improving tensile strength compared to traditional direct tapping. The outer wall of threaded sleeve 902 can also feature a knurled or cold-forged structure, creating an interference fit with second through-hole 901 of positioning member 9. This distributes the bolt preload force over a larger contact area, effectively reducing stress concentration in the positioning member 9 material.

[0084] In the above technical solution, by providing the threaded sleeve 902 , the connection strength and connection stability between the fastener 11 and the positioning member 9 , the limiting assembly 8 and the end plate 7 are improved.

[0085] In some embodiments of the present application, an adhesive layer is provided on the surface of the positioning member 9 facing the installation groove 702 , and the adhesive layer fixes the positioning member 9 in the installation groove 702 .

[0086] The adhesive layer provides initial adhesion before the bolts are tightened, reducing displacement of the positioning member 9 during automated assembly and shortening the time required to align the holes of the fastener 11. In the above structure, the provision of the adhesive layer enables pre-positioning of the positioning member 9 and improves the connection strength between the positioning member 9 and the end plate 7.

[0087] In some embodiments of the present application, the positioning member 9 extends at one end close to the main body 801 to form a clamping portion 903, and the projection dimension of the clamping portion 903 in the first direction X exceeds the thickness dimension of the end plate 7, so that the clamping portion 903 forms a limiting fit with the side end face of the end plate 7 in the second direction Y.

[0088] The projection of the clamping portion 903 in the first direction X exceeds the thickness of the end plate 7, forming a hook-like structure, which produces a surface contact limit with the side end face of the end plate 7 in the second direction Y, effectively resisting the displacement of the positioning member 9 caused by the expansion force of the battery cell 6. The clamping portion 903 forms a torque arm with the side end face of the end plate 7, which improves the torsional rigidity of the positioning member 9 and reduces the shear stress at the bolt connection. The clamping portion 903 acts as a guiding feature, providing constraints before the adhesive layer cures, thereby reducing the installation tolerance of the positioning member 9. In the above structure, the provision of the clamping portion 903 effectively improves the assembly accuracy and efficiency of the positioning component.

[0089] like Figure 9 As shown, in some embodiments, a weight-reducing groove 904 is provided on the side of the clamping portion 903 facing the battery cell 6. The above structure reduces the weight of the positioning member 9, reduces the material cost, and improves the energy density of the battery device 2.

[0090] In some embodiments, the clamping portion 903 is provided with at least two protrusions 906 spaced apart along the third direction Z, and a limiting groove 907 is formed between two adjacent protrusions 906. The limiting component 8 is partially embedded in the limiting groove 907 to constrain the displacement of the limiting component 8 in the third direction Z. The third direction Z is perpendicular to the first direction X and the second direction Y.

[0091] The clamping portion 903 is provided with at least two protrusions 906 spaced apart along the third direction Z, and a limiting groove 907 is formed between adjacent protrusions. The limiting component 8 is partially embedded in the limiting groove 907, and its displacement in the third direction Z is constrained by the side wall of the protrusion 906. The third direction Z is perpendicular to the first direction X and the second direction Y, forming a three-dimensional spatial constraint. The side wall of the protrusion 906 directly blocks the movement of the limiting component 8 in the third direction Z, avoiding displacement caused by vibration or assembly tolerance. The limiting groove 907 and the mating surface of the limiting component 8 form a torque transmission path, which improves the torsional stiffness of the limiting component 8 and reduces the shear stress at the bolt connection.

[0092] The above structure limits the movement of the limit assembly 8 relative to the end plate 7 along the third direction Z by providing a protrusion 906, thereby improving the accuracy of the installation position of the limit assembly 8. In some embodiments, the protrusion 906 is provided on the side surface of the clamping portion 903 away from the battery cell 6, and the bent portion 802 is provided in the corresponding limit groove 907. The protrusion 906 is provided on one side of the end plate 7 and close to the first through hole 701. During the installation of the limit assembly 8, this layout can provide a clearer positioning reference for the limit assembly 8. When the limit assembly 8 is installed, the protrusion 906 can guide the installation direction of the limit assembly 8 to prevent it from twisting during the installation process, thereby reducing installation difficulties, component damage and other problems caused by twisting. Since the risk of twisting is reduced, the installer can install the limit assembly 8 more quickly and accurately without repeatedly adjusting the position, thereby improving the installation efficiency.

[0093] The above structure places the side surface of the end plate 7 where the protrusion 906 is provided closer to the first through hole 701 , which can reduce the risk of twisting of the limiting assembly 8 during installation and improve installation efficiency.

[0094] like Figure 3 as well as Figure 4 As shown, in some embodiments of the present application, the limiting assembly 8 includes two limiting bars spaced apart along the third direction Z, and two second through holes 901 are correspondingly provided on the positioning member 9, and each limiting bar cooperates with the corresponding second through hole 901 on the positioning member 9.

[0095] A single limit bar may deform or shift when subjected to significant external forces, reducing its effectiveness. However, by providing two limit bars, they work together to share the external forces acting on the battery cell 6, increasing the overall rigidity and stability of the limit system. Even if one limit bar is locally impacted or deformed, the other limit bar can still function, significantly improving the strength of the battery cell 6.

[0096] The two limiting bars and the positioning member 9 cooperate to form a more stable frame. During the use of the battery module, it will be subjected to various forces such as vibration and impact. This stable frame structure can effectively resist the influence of these forces, reduce the shaking and displacement of the battery cells 6, ensure the overall structural stability of the battery module, and extend the service life of the battery module.

[0097] The second through-holes 901 on the positioning member 9 provide a precise positioning reference for the installation of the stop bar. During installation, the operator simply needs to accurately pass the stop bar through the corresponding second through-holes 901 to ensure the positional accuracy of the stop bar. This precise installation method ensures that the clearance between the stop bar and the battery cell 6 meets the design requirements, improving the stop effect.

[0098] In the above structure, by providing two limiting bars, the strength of limiting the battery cell 6 is further improved.

[0099] like Figure 9 as well as Figure 10 As shown, in some embodiments of the present application, two partitions 703 are provided in the installation groove 702 to divide the installation groove 702 into a first groove 704, a second groove 705 and a third groove 706 along the third direction Z, and the positioning member 9 includes a first positioning portion 908 provided in the first groove 704, a buffer portion 909 provided in the second groove 705 and a second positioning portion 910 provided in the third groove 706.

[0100] Two partitions 703 are provided within the mounting groove 702, dividing it along the third direction Z into a first groove 704, a second groove 705, and a third groove 706. This partitioning design provides dedicated accommodation spaces 5c for different parts of the positioning member 9, allowing the positioning member 9 to be rationally arranged within the mounting groove 702 according to functional requirements. A first positioning portion 908 is provided in the first groove 704 and is primarily used to initially position the battery cell 6 or related components, ensuring their accurate positioning in a specific direction. A buffer portion 909 is located in the second groove 705 and acts as a buffer and energy absorber. When the battery cell 6 is subjected to external impact or vibration, the first positioning portion 908 and the second positioning portion 910 may be squeezed. The buffer portion 909 absorbs this squeeze, reducing damage to the positioning member 9 and the battery cell 6. The second positioning portion 910 is provided in the third groove 706 and cooperates with the first positioning portion 908 to further enhance the positioning of the battery cell 6 or related components and ensure their stability. The first positioning portion 908 and the second positioning portion 910 are located in the first groove 704 and the third groove 706, respectively, and cooperate with the mounting groove 702 to achieve precise positioning of the battery cell 6 or related components. This positioning method can reduce the shaking and displacement of the battery cell 6, thereby improving the overall performance and safety of the battery module.

[0101] In the above structure, the partition plate 703 in the installation groove 702 improves the structural strength of the installation groove 702 .

[0102] In some embodiments of the present application, the clamping portion 903 , the first positioning portion 908 , the buffer portion 909 , and the second positioning portion 910 are manufactured through an integral molding process to form an integral structure.

[0103] The integral structure manufactured by the one-piece molding process has no obvious connection gap between the clamping portion 903 and the first positioning portion 908, the buffer portion 909 and the second positioning portion 910, and the stress distribution is more uniform, which can effectively avoid stress concentration, thereby significantly improving the strength of the overall structure. One-piece molding ensures the continuity of the materials of each part at the microscopic level. Material continuity means that when subjected to external force, the force can be transmitted more smoothly throughout the structure, reducing the risk of structural failure caused by material breakage or separation. For example, when the battery module is subjected to severe vibration or impact, the one-piece molded positioning member 9 can better maintain the integrity of the structure and protect the battery cell 6 from damage.

[0104] The one-piece molding process can complete the manufacture of multiple components in one processing process, ensuring that the dimensional accuracy between the clamping portion 903, the first positioning portion 908, the buffer portion 909 and the second positioning portion 910 is highly consistent. This consistency of dimensional accuracy allows the positioning member 9 to accurately match other components in the battery module during installation, reducing installation difficulties caused by dimensional deviations, problems such as excessive or insufficient clearances. For example, the fitting clearance between the positioning member 9 and the mounting groove 702 can be strictly controlled within the design range, ensuring that the positioning member 9 will not shake or loosen after installation, thereby improving the stability of the installation. The one-piece molding process simplifies the component manufacturing and assembly process that originally required multiple steps to complete into one step, greatly shortening the production cycle. For example, the traditional assembly method may require the clamping portion 903, the first positioning portion 908, the buffer portion 909 and the second positioning portion 910 to be manufactured separately, and then perform multiple steps such as cleaning, gluing, and assembly. However, the one-piece molding process can be completed with only one molding process, reducing the production links and equipment usage, and improving production efficiency.

[0105] In the above structure, the structural strength between the clamping portion 903 and the first positioning portion 908, the buffer portion and the second positioning portion 910 is improved through the one-piece molding process, and the installation stability of the positioning member 9 is improved.

[0106] like Figure 8 as well as Figure 9 As shown, in some embodiments of the present application, the positioning member 9 includes a support plate 911 and a support ring 912. The support plate 911 is provided with a second through hole 901. The support plate 911 is disposed opposite the end plate 7. The surface of the support plate 911 facing the end plate 7 is provided with an adhesive layer. The support ring 912 is provided on the side of the support plate 911 facing away from the adhesive layer.

[0107] The support plate 911 provides a larger setting space for the second through hole 901. Compared with the situation where a hole is directly opened on a smaller structure without the support plate 911, the support plate 911 can be designed with a suitable size according to actual needs, so that the layout of the second through hole 901 is more flexible while ensuring the rationality of the structure. For example, when multiple second through holes 901 need to be set to adapt to fasteners 11 of different numbers or layouts, the support plate 911 can provide sufficient area to meet this requirement, ensuring that the fasteners 11 can pass through accurately and stably. The support plate 911 is arranged opposite to the end plate 7, and plays a key role of connection and support in the installation structure of the limit assembly 8. It provides a mounting platform for other components such as the support ring 912, making the installation of the entire limit assembly 8 more stable and reliable.

[0108] The surface of support plate 911 facing end plate 7 is provided with an adhesive layer, which securely connects support plate 911 to end plate 7. This connection method is simple and easy to implement, and it can absorb vibration and shock to a certain extent, reducing the looseness and noise that may be caused by mechanical connections. The adhesive layer also acts as a seal, preventing foreign matter from entering the interior of limiter assembly 8 and affecting its performance.

[0109] The support ring 912 is arranged on the side surface of the support plate 911 away from the adhesive layer, which can effectively enhance the structural strength of the support plate 911. When the limiting assembly 8 is subjected to external force, the support ring 912 can disperse the stress borne by the support plate 911 and prevent the support plate 911 from deforming or breaking. For example, when the battery module is subjected to severe vibration or collision, the support ring 912 can withstand part of the impact force, protect the integrity of the support plate 911 and the second through hole 901, and ensure that the fastener 11 can function normally. The presence of the support ring 912 can improve the connection stability between the support plate 911 and the fastener 11. It can increase the thickness and rigidity of the contact part between the support plate 911 and the fastener 11, and reduce the local stress concentration on the support plate 911 caused by tightening or loosening the fastener 11. At the same time, the support ring 912 can also play a positioning and guiding role, so that the fastener 11 can pass through the second through hole 901 more accurately, thereby improving installation accuracy and efficiency.

[0110] The above structure increases the setting area of the second through hole 901 by setting the support plate 911, and the support ring 912 improves the structural strength of the support plate 911 and the connection stability between the positioning member 9 and the fastener 11, thereby improving the installation stability of the limit assembly 8.

[0111] In some embodiments, a fourth through hole 913 coaxial with the second through hole 901 is defined in the support ring 912 , and the threaded sleeve 902 extends axially and passes through the fourth through hole 913 .

[0112] A fourth through-hole 913, coaxial with the second through-hole 901, is provided within the support ring 912, increasing the effective connection area between the fastener 11 and the positioning member 9. The contact area between the second through-hole 901 and its surrounding area and the fastener 11 is too small. The addition of the fourth through-hole 913 allows the fastener 11 to penetrate deeper into the support ring, creating a wider contact area. For example, when a bolt is used as the fastener 11, the threaded portion of the bolt can interact with the inner walls of both the second through-hole 901 and the fourth through-hole 913 simultaneously, significantly increasing the connection interface and thus improving connection reliability.

[0113] A larger connection area helps disperse the stress generated by fastener 11 during tightening. When the battery module is subjected to external forces such as vibration, impact, or thermal expansion and contraction, fastener 11 will be subjected to forces in various directions. Without sufficient connection area to disperse these stresses, the connection can easily become loose or damaged. The provision of fourth through-hole 913 allows stress to be more evenly distributed across support plate 911 and the support ring, reducing the risk of localized stress concentration and improving the fatigue resistance of the entire connection structure.

[0114] The threaded sleeve 902 extends axially through the fourth through-hole 913. The internal threads of the threaded sleeve 902 closely mate with the external threads of the fastener 11, increasing the friction and engagement force of the connection and further enhancing the connection strength. Compared with tapping directly on the support ring, using the threaded sleeve 902 can avoid thread damage or loosening caused by insufficient hardness of the support ring material or insufficient machining precision. Furthermore, the threaded sleeve 902 also protects the support ring, reducing wear on the support ring during tightening and loosening of the fastener 11. The presence of the threaded sleeve 902 makes installation of the fastener 11 more convenient and accurate. During installation, the operator can screw the fastener 11 directly into the threaded sleeve 902 without worrying about thread matching. Furthermore, when the fastener 11 needs to be replaced or maintained, it can simply be unscrewed from the threaded sleeve 902, eliminating the need for complex machining or repair of the support ring, reducing maintenance costs and time.

[0115] In the above structure, the fourth through hole 913 is provided to increase the connection area between the fastener 11 and the positioning member 9 and improve the connection strength.

[0116] In some embodiments, a reinforcing rib 914 extending along the first direction X is provided on the outer peripheral wall of the support ring 912 , and one end of the reinforcing rib 914 is rigidly connected to the support plate 911 .

[0117] The support ring 912 is subjected to external forces from all directions during operation, and these external forces may cause the support ring 912 to deform or even be damaged. Reinforcing ribs 914 extending along the first direction X are provided on the outer peripheral wall of the support ring 912, which is equivalent to adding an additional support skeleton to the structure of the support ring 912. When an external force acts on the support ring 912, the reinforcing ribs 914 can share part of the stress and disperse the stress from the main stress-bearing parts of the support ring 912 to a wider area. For example, when the battery module is subjected to severe vibration or collision, the reinforcing ribs 914 can withstand part of the impact force to prevent the support ring 912 from rupturing or permanent deformation due to excessive local stress, thereby enhancing the overall load-bearing capacity of the support ring 912.

[0118] The reinforcing ribs 914 are connected to the material of the support ring 912, which increases the cross-sectional moment of inertia of the support ring 912, thereby increasing the rigidity of the support ring 912. The increase in rigidity makes it more difficult for the support ring 912 to bend or twist when subjected to external force. For the positioning member 9, the increase in the rigidity of the support ring 912 helps to maintain the relative position between it and the support plate 911 and the fastener 11, ensuring that the limiting assembly 8 can accurately play a limiting role. For example, during the process of thermal expansion and contraction of the battery module, the support ring 912 can better resist dimensional changes caused by temperature changes, and reduce loose connections or positioning deviations caused by deformation.

[0119] One end of the reinforcing rib 914 is rigidly connected to the support plate 911. This connection method ensures smooth transmission of force. When the support ring 912 is subjected to external force, the force borne by the reinforcing rib 914 can be quickly and effectively transmitted to the support plate 911. As an important component of the positioning member 9, the support plate 911 has a large area and a certain structural strength, which can further disperse and withstand these forces. For example, during the tightening process of the fastener 11, the tensile force generated will be transmitted to the reinforcing rib 914 through the support ring 912, and then transmitted to the support plate 911 by the reinforcing rib 914, avoiding excessive concentration of stress in the local area of the support ring 912 and improving the structural stability of the entire positioning member 9.

[0120] In an optional embodiment, the battery device 2 includes a battery cell 6, an end plate 7, a limiting assembly 8, and a positioning assembly. The end plate 7 is provided at both ends of the battery cell 6 along the first direction X, and the end plate 7 is provided with a first through hole 701 extending along the first direction X. The limiting assembly 8 includes a main body 801 provided on one side of the battery cell 6 along the second direction Y and a bent portion 802 bent from the main body 801 toward the end plate 7, wherein the second direction Y is perpendicular to the first direction X. The positioning assembly includes a positioning member 9 and a fastener 11. The positioning member 9 is connected to the end plate 7, and the positioning member 9 is provided with a second through hole 901 coaxial with the first through hole 701, and the bent portion 802 is provided with a third through hole 803 coaxial with the second through hole 901. The fastener 11 passes through the first through hole 701, the third through hole 803, and the second through hole 901 to fix the limiting assembly 8, the positioning member 9, and the end plate 7. The end surface of the end plate 7 along the first direction X is provided with a mounting groove 702, and the positioning member 9 is provided in the mounting groove 702. The positioning member 9 also includes a threaded sleeve 902, which passes through the second through hole 901, the third through hole 803 and the first through hole 701 and is connected to the positioning member 9, the limiting assembly 8 and the end plate 7. The fastener 11 is a connecting bolt, which passes through the threaded sleeve 902 to fix the limiting assembly 8 to the positioning member 9 and the end plate 7. The surface of the positioning member 9 facing the mounting groove 702 is provided with an adhesive layer, and the adhesive layer fixes the positioning member 9 in the mounting groove 702. The positioning member 9 extends at one end close to the main body 801 to form a clamping portion 903. The projection dimension of the clamping portion 903 in the first direction X exceeds the thickness dimension of the end plate 7, so that the clamping portion 903 forms a limiting fit with the end surface of the end plate 7 on the side in the second direction Y. The clamping portion 903 is provided with at least two protrusions 906 spaced apart along the third direction Z, and a limiting groove 907 is formed between two adjacent protrusions 906. The limiting component 8 is partially embedded in the limiting groove 907 to constrain the displacement of the limiting component 8 in the third direction Z. The third direction Z is perpendicular to the first direction X and the second direction Y.

[0121] The embodiments of the present application also provide an energy storage system, including the battery device 2 in the above-mentioned embodiment. The end plate 7 limits the battery cell 6 and restricts the movement of the battery cell 6 along the first direction X. The limiting assembly 8 is connected to the end plate 7 and can, together with the end plate 7, connect multiple battery cells 6 into a group, thereby improving the connection strength between the battery cells 6, facilitating the installation and fixation between the battery cells 6 and the electrical connection structure, and improving the operational stability of the battery device 2. In addition, the bent portion 802 of the limiting assembly 8 extends to one side of the end plate 7, thereby improving the strength and stability of the connection with the end plate 7. The positioning member 9 is provided on the end plate 7, and a first through hole 701 is provided on the end plate 7. The positioning member 9 and the limiting assembly 8 can be stably connected by a fastener 11, thereby improving the strength of the connection. As long as the first through hole 701 is provided on the end plate 7, the positioning member 9 and the limiting assembly 8 can be fixed. The combination of the limiting assembly 8 and the positioning member 9 becomes an end plate 7 suitable for various specifications and shapes, which can fix different battery cells 6. Therefore, the above technical solution expands the applicable scope of the end plate 7 assembly and improves the assembly efficiency of the battery device 2.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cells; an end plate connected to one side of the battery cell along a first direction, wherein the end plate is provided with a first through hole penetrating along the first direction; a limiting assembly comprising a main body provided on one side of the battery cell along a second direction and a bent portion bent from the main body toward the end plate, wherein the second direction is perpendicular to the first direction; A positioning assembly includes a positioning member and a fastener. The positioning member is connected to the end plate. The positioning member is provided with a second through hole coaxial with the first through hole. The bending portion is provided with a third through hole coaxial with the second through hole. The fastener passes through the first through hole, the third through hole and the second through hole to fix the limit assembly, the positioning member and the end plate.

2. The battery device according to claim 1, wherein: An installation groove is provided on the end surface of the end plate along the first direction, and the positioning member is arranged in the installation groove.

3. The battery device according to claim 2, characterized in that The positioning member also includes a threaded sleeve, which passes through the second through hole, the third through hole and the first through hole and is connected to the positioning member, the limiting assembly and the end plate. The fastener is a connecting bolt, which passes through the threaded sleeve to fix the limiting assembly to the positioning member and the end plate.

4. The battery device according to claim 3, characterized in that An adhesive layer is provided on the surface of the positioning member facing the installation groove, and the adhesive layer fixes the positioning member in the installation groove.

5. The battery device according to claim 4, characterized in that The positioning member extends at one end close to the main body to form a clamping portion, the projection dimension of the clamping portion in the first direction exceeds the thickness dimension of the end plate, so that the clamping portion forms a limiting fit with the second direction side end surface of the end plate.

6. The battery device according to claim 5, characterized in that A weight-reducing groove is provided on a side of the clamping portion facing the battery cell.

7. The battery device according to claim 6, characterized in that The clamping portion is provided with at least two protrusions spaced apart along the third direction, and a limiting groove is formed between two adjacent protrusions. The limiting component is partially embedded in the limiting groove to constrain the displacement of the limiting component in the third direction, and the third direction is perpendicular to the first direction and the second direction.

8. The battery device according to claim 7, characterized in that The convex portion is arranged on a surface of the clamping portion facing away from the battery cell, and the bent portion is arranged in the corresponding limiting groove.

9. The battery device according to claim 8, characterized in that The limiting assembly includes two limiting bars spaced apart along the third direction. The positioning member is correspondingly provided with two second through holes. Each of the limiting bars cooperates with a corresponding second through hole on the positioning member.

10. The battery device according to claim 9, characterized in that Two partitions are provided in the installation groove to divide the installation groove into a first groove, a second groove and a third groove along the third direction. The positioning member includes a first positioning portion provided in the first groove, a buffer portion provided in the second groove and a second positioning portion provided in the third groove.

11. The battery device according to claim 10, characterized in that The clamping portion, the first positioning portion, the buffer portion and the second positioning portion are manufactured by an integral molding process to form an integral structure.

12. The battery device according to any one of claims 9 to 11, characterized in that: The positioning member includes: a support plate, provided with the second through hole, the support plate being arranged opposite to the end plate, and the surface of the support plate facing the end plate being provided with the adhesive layer; The support ring is arranged on a surface of the support plate that is away from the adhesive layer.

13. The battery device according to claim 12, characterized in that A fourth through hole coaxial with the second through hole is provided in the support ring, and the threaded sleeve extends axially and passes through the fourth through hole.

14. The battery device according to claim 13, wherein: The outer peripheral wall of the support ring is provided with a reinforcing rib extending along the first direction, and one end of the reinforcing rib is rigidly connected to the support plate.

15. An energy storage system, characterized in that: The energy storage system comprises the battery device according to any one of claims 1 to 14 and a heat exchange component, wherein the heat exchange component is used for exchanging heat with battery cells in the battery device.

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