Battery device and electric equipment

Abstract

The utility model provides a battery device and electric equipment, the battery device comprises a box body, the box body comprises a bottom wall and side walls, the side walls are arranged around the bottom wall and define a containing cavity, and the side walls comprise first walls oppositely arranged along a first direction and second walls oppositely arranged along a second direction; the battery module is arranged in the accommodating cavity, the battery module comprises a battery monomer arrangement assembly and end plates, the battery monomer arrangement assembly comprises a plurality of battery monomers stacked in the first direction, and the end plates are arranged at the two ends, in the first direction, of the battery monomer arrangement assembly correspondingly; the battery monomer arrangement assembly and the second wall are arranged at intervals in the second direction, and a gap is formed; the buffer part is arranged in the gap, the relative position of the buffer part and at least one of the battery monomer arrangement assembly and the box body is fixed, and the orthographic projection of the buffer part in the second direction covers the plurality of battery monomers distributed in the first direction. The lateral extrusion resistance of the battery device can be effectively improved, and the reliability of the battery device is ensured.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] The battery device in the related art has insufficient resistance to side extrusion, and the battery cells are easily damaged by the force, which affects the reliability of the battery device as a whole. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can effectively improve the battery device's ability to resist lateral extrusion and ensure the reliability of the battery device.

[0005] In the first aspect, the present application provides a battery device, comprising: a box body, comprising a bottom wall and side walls, the side walls are arranged around the bottom wall and enclosed to form a accommodating cavity, the side walls include a first wall arranged opposite to each other along a first direction and a second wall arranged opposite to each other along a second direction, the first wall and the second wall intersect and are respectively connected to the bottom wall; a battery module, arranged in the accommodating cavity, the battery module includes a battery cell arrangement assembly and an end plate, the battery cell arrangement assembly includes a plurality of battery cells stacked along the first direction, the battery cell arrangement assembly is respectively provided with end plates at both ends of the first direction, and the battery cell arrangement assembly is spaced apart from the second wall in the second direction and a gap is formed; a buffer, arranged in the gap, the relative position of the buffer to at least one of the battery cell arrangement assembly and the box body is fixed, and the positive projection of the buffer in the second direction covers the plurality of battery cells distributed along the first direction.

[0006] In the technical solution of the embodiment of the present application, side extrusion generally includes extrusion of the side wall in a first direction and extrusion of the side wall in a second direction. Since end plates are provided at both ends of the first direction, the end plates at least partially absorb the side extrusion force borne by the first wall, thereby reducing damage to the battery cells due to the side extrusion force borne by the first direction. At the same time, by forming a gap between the battery cell arrangement assembly and the second wall in the second direction, and providing a buffer member in the gap, the relative position of the buffer member to at least one of the battery cell arrangement assembly and the housing is fixed, and the positive projection of the buffer member in the second direction covers multiple battery cells distributed along the first direction, thereby changing the traditional point contact force transmission method. When the side of the battery device, such as the second wall, is extruded, the external force no longer directly concentrates on the local position of a single battery cell, but is first transmitted from the housing to the buffer member, and then the extrusion force is dispersed to multiple battery cells through the buffer member, significantly reducing the pressure peak borne by the single battery cell, and avoiding deformation and damage caused by local stress concentration.

[0007] In some embodiments, along the second direction, the buffer has a mating surface disposed toward the battery cell arrangement assembly, and an orthographic projection of the mating surface in the second direction covers a plurality of battery cells distributed along the first direction.

[0008] By providing a mating surface that forms surface contact with multiple battery cells, the stress concentration problem of traditional point / line contact is transformed into a surface-distributed stress conduction mode. When the battery assembly is squeezed from the side, the mating surface of the buffer component can absorb the compressive force transmitted by the casing over a larger area, and through surface contact, evenly distribute the force across the multiple battery cell surfaces, preventing localized excessive pressure. Surface contact reduces the force per unit area, effectively improving the uniformity and efficiency of force transmission, and further reducing the risk of deformation of battery cells due to stress concentration.

[0009] In some embodiments, the buffer also includes a guide surface arranged opposite to the mating surface along the second direction, the guide surface is arranged at an angle, the vertical distance from the end of the guide surface facing the bottom wall to the mating surface is d1, and the vertical distance from the end of the guide surface facing away from the bottom wall to the mating surface is d2, wherein d2>d1.

[0010] By providing a guide surface and tilting it outward, the shape of the housing can be better adapted, ensuring a good fit between the buffer and the housing, improving the stability and reliability of the entire structure and reducing shaking or displacement caused by a loose fit. Furthermore, the guide surface, with its smaller bottom and larger top, serves as a guide during assembly. Assemblers can more smoothly align the buffer with the housing's installation position and gradually install it into the housing along the tilt of the guide surface, reducing assembly difficulty and improving efficiency. This also helps reduce damage to the buffer or the housing during assembly.

[0011] In some embodiments, a buffer cavity is provided inside the buffer component.

[0012] Through the above-mentioned arrangement, when the buffer is subjected to lateral extrusion force, the existence of the buffer cavity enables the buffer to deform under pressure. Taking a metal buffer as an example, the buffer cavity inside it will cause the metal wall to undergo elastic deformation when subjected to force, converting part of the lateral extrusion force into the elastic potential energy of the buffer itself. For non-metallic buffers, such as hard rubber, the buffer cavity can cause the rubber material to undergo compression deformation under pressure and absorb energy. By absorbing the lateral extrusion force through the buffer cavity, the lateral extrusion force transmitted to the battery cell can be effectively reduced, reducing the impact of external force on the battery cell, further ensuring the structural safety and stable performance of the battery cell, reducing the risk of failure of the battery device due to external force impact, and improving the reliability of the entire battery system.

[0013] In some embodiments, the buffer is a solid structure including at least one of foam and rubber.

[0014] Through the above-mentioned arrangement, the buffer adopts a solid structure and includes at least one of foam and rubber, which can realize force transmission in the form of surface contact. In addition, materials such as foam and rubber have good elasticity and deformation ability. When the battery device is subjected to lateral extrusion force, the solid structure buffer can be compressed and deformed, converting the external extrusion force into its own elastic potential energy or internal friction heat energy, thereby absorbing a large amount of energy. Taking foam as an example, the bubble structure inside it will collapse and deform when under pressure, consuming the extrusion energy; rubber absorbs energy through deformation such as stretching and twisting of the molecular chain. This effective energy absorption mechanism further reduces the extrusion force transmitted to the battery cell, provides more reliable buffering protection for the battery cell, and further improves the safety and reliability of the battery device when subjected to lateral extrusion.

[0015] In some embodiments, the battery module further includes a pressure strip, the pressure strip abuts against one end of at least two battery cells facing away from the bottom wall, and the pressure strip is connected and fixed to the buffer.

[0016] By connecting and securing the pressure strip and buffer into a single integrated component, the number of parts in the battery module is reduced. Compared to installing the pressure strip and buffer separately, this integrated design reduces assembly complexity, steps, and time, thereby improving production efficiency. Furthermore, the reduction in the number of parts also reduces procurement and inventory management costs, as well as quality issues caused by improper component assembly, helping to lower the production and maintenance costs of the entire battery assembly.

[0017] In some embodiments, the pressure strip and the buffer member are an integrated structure, and the pressure strip and the buffer member are respectively bonded and fixed to a plurality of battery cells distributed along the first direction.

[0018] One embodiment of the present application provides a battery device that integrates a pressure strip and a buffer into a one-piece structure, which can enhance the restraint of battery cells from multiple dimensions. The pressure strip and buffer can connect multiple battery cells into a whole from different positions, further improving the integrity and stability of the battery cell arrangement assembly, while also further dispersing the squeezing force and improving the reliability of the battery device.

[0019] In some embodiments, the battery module further includes a strap, which is tied around the periphery of the battery cell arrangement assembly. A groove is provided on the pressure strip, and a portion of the strap is located in the groove.

[0020] The battery device provided by one embodiment of the present application can securely bind multiple battery cells together by providing a binding strap, preventing the battery cells from relative displacement or loosening when the battery device is subjected to vibration, impact, or external force, thereby ensuring the structural stability of the battery cell arrangement assembly and thus guaranteeing the normal operating performance of the battery device. The provision of a groove on the pressure strip facilitates the positioning and installation of the corresponding binding strap, and the binding strap can work together with the pressure strip, buffer, and other components to form a stable overall structure, optimizing the force transmission path. When the battery device is subjected to external force, the binding strap, pressure strip, and buffer work together to disperse the external force, reducing the risk of excessive local force on the battery cells.

[0021] In some embodiments, the buffer member includes a buffer plate and a plurality of connecting ribs, each connecting rib is disposed on a side of the buffer plate facing away from the battery cell arrangement assembly in the second direction, and the connecting rib is fixedly connected to the second wall.

[0022] One embodiment of the present application provides a battery device in which the buffer components are integrally connected to the housing. Compared to independently positioned buffer components, this reduces the connection gaps and relative movement between components, enabling the entire battery device to operate more collaboratively when subjected to lateral compression. This integrated structure enhances the overall rigidity of the battery device, reduces the risk of damage to battery cells due to loose or detached components, and improves the device's reliability under complex operating conditions. Furthermore, a buffer plate is positioned facing the outermost battery cell and, through connecting ribs, forms a buffer cavity with the housing. When the battery device is subjected to lateral pressure, the buffer plate is the first to bear the external force. Due to the presence of the buffer cavity, the buffer plate can undergo a certain degree of elastic deformation, converting mechanical energy into elastic potential energy, thereby absorbing some of the lateral compression force. Furthermore, the buffer plate distributes the force across multiple battery cells distributed along a first direction through surface transmission. Compared to traditional point-contact force transmission, this significantly reduces the localized pressure on individual battery cells, effectively preventing deformation and damage to the battery cells due to localized stress concentration, and significantly improving the battery device's resistance to lateral compression.

[0023] In some embodiments, the box body includes a non-metal box body, and the non-metal box body includes a bottom wall and side walls.

[0024] The battery device provided by one embodiment of the present application has a case including a non-metallic case body. The non-metallic material itself is non-conductive, which can effectively avoid the occurrence of short circuits between the electrodes inside the battery device and the case body, thereby improving the electrical reliability of the battery device. During the use of the battery device, even if abnormal conditions such as battery cell damage or electrolyte leakage occur, the non-metallic case body can to a certain extent prevent the current from being conducted through the case body, reducing the risk of safety accidents such as fire and explosion caused by short circuits. In addition, the use of a non-metallic case body can significantly reduce the overall weight of the battery device. For application scenarios such as electric vehicles, the lightweight battery device helps to increase the vehicle's range and reduce energy consumption; at the same time, the lightweight battery device is more convenient during transportation and installation, which can reduce manpower and material costs.

[0025] In some embodiments, the battery device further includes a heat exchange element, which is disposed in the accommodating cavity and between the bottom wall and the battery module.

[0026] In one embodiment of the present application, a heat exchanger in a battery device quickly transfers heat generated by the battery cells to other parts, overcoming the limitations of plastic or non-metallic enclosures, which often suffer from poor heat dissipation. Whether dissipating heat through solid heat conduction, liquid circulation, or air convection, the heat exchanger effectively reduces the temperature of the battery cells, preventing overheating due to heat accumulation. This ensures that the battery operates within a suitable temperature range, improving its charge and discharge performance and reliability.

[0027] In some embodiments, the battery device also includes a metal component, which is arranged outside the accommodating cavity. The metal component includes a supporting member and a mounting member. The supporting member is supported on the side of the bottom wall facing away from the accommodating cavity, and the mounting member is protruding from the side of the side wall facing away from the accommodating cavity.

[0028] The battery device provided in one embodiment of the present application, through the above-mentioned arrangement, facilitates connection of the battery device to other components of the electrical equipment via the mounting member, thereby ensuring mounting requirements. The supporting member can be supported on the side of the bottom wall facing away from the accommodating cavity, and together with the non-metallic box, supports the battery cell, thereby ensuring the supporting capacity of the battery cell.

[0029] In some embodiments, the non-metallic box body further includes an extension section, one end of the extension section is connected to the side wall and the other end extends away from the accommodating cavity, and the mounting member and the extension section are at least partially stacked and connected.

[0030] The battery device provided in one embodiment of the present application, through the above-mentioned configuration, helps to ensure the connection strength requirements between the non-metallic box and the metal component, while also helping to meet the mounting requirements.

[0031] In some embodiments, the battery cell arrangement assembly includes multiple battery packs distributed along the second direction, each battery pack includes multiple battery cells distributed along the first direction, the positive projection of the end plate in the first direction covers each battery pack, and in the second direction, buffer members are respectively arranged between the two outermost battery packs and the corresponding second walls.

[0032] The battery device provided in one embodiment of the present application facilitates the arrangement and combination of multiple battery cells through the above-mentioned configuration, and at the same time, helps to ensure the reliability of the battery device when it withstands lateral extrusion forces in different directions.

[0033] In some embodiments, a battery cell includes a shell, an electrode assembly, and an end cover assembly. The electrode assembly is disposed in the shell, and the end cover assembly is covered at the opening of the shell. The shell includes a first shell wall and a second shell wall that are intersectingly disposed. The area of ​​the first shell wall is greater than the area of ​​the second shell wall. The first shell wall is disposed toward the end plate, and the second shell wall is disposed toward the buffer. Along the second direction, the buffer covers the second shell wall of each battery cell of the outermost battery pack.

[0034] One embodiment of the present application provides a battery cell that facilitates at least partial absorption of the lateral extrusion force exerted on the first wall via the end plate, thereby reducing damage to the battery cell due to lateral extrusion force exerted in the first direction. Furthermore, when a side surface of the battery device, such as the second wall, is squeezed, the external force no longer acts directly and concentratedly on a localized portion of a single battery cell. Instead, the external force is first transmitted from the housing to the buffer, which then distributes the extrusion force to the battery cells of the outermost battery pack. This significantly reduces the peak pressure exerted on the individual battery cells and avoids deformation and damage caused by localized stress concentration.

[0035] In a second aspect, the present application provides an electrical device comprising the above-mentioned battery device.

[0036] 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

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0038] Figure 1 is a structural schematic diagram of a vehicle provided in one embodiment of the present application;

[0039] Figure 2 is a structural diagram of a battery device provided in one embodiment of the present application;

[0040] Figure 3 is a schematic diagram of a partial structure of a battery device provided in one embodiment of the application;

[0041] Figure 4 This is a schematic structural diagram of a battery cell provided in one embodiment of the present application;

[0042] Figure 5 This is a cross-sectional view of a partial structure of a battery device according to an embodiment of the present application;

[0043] Figure 6 yes Figure 5 A partial enlarged view of point A in the middle;

[0044] Figure 7 This is a schematic structural diagram of a buffer member according to an embodiment of the present application;

[0045] Figure 8 It is a partial cross-sectional view of a battery device according to another embodiment of the present application.

[0046] Marking Description:

[0047] 1. Vehicle; 100. Battery device; 200. Motor; 300. Controller;

[0048] 10. Box body;

[0049] 11. Non-metallic box body; 111. Bottom wall; 112. Side wall; 1121. First wall; 1122. Second wall; 113. Accommodating cavity; 114. Extension section;

[0050] 12. Metal components; 121. Supporting parts; 122. Mounting parts;

[0051] 20. Battery module;

[0052] 21. Battery cell arrangement assembly;

[0053] 211. Battery pack;

[0054] 211a, battery cell; 2111, housing; 2111a, first housing wall; 2111b, second housing wall; 2112, electrode assembly; 2113, end cap assembly;

[0055] 22. End plate; 23. Pressing strip; 231. Groove; 24. Binding strap;

[0056] 30. Buffer member; 30a. Mating surface; 30b. Guide surface; 30c. Buffer cavity; 31. Buffer plate; 32. Connecting rib;

[0057] 40. Heat exchange components;

[0058] 50. Upper cover;

[0059] 60. Gap;

[0060] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0061] 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.

[0062] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0063] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they should not be understood as limiting the embodiments of the present application.

[0064] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0065] 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; and 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.

[0066] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0067] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0068] With the rapid development of the new energy electric vehicle industry, market requirements for vehicle lightweighting and battery energy density are increasing year by year. In this context, the reliability of battery devices is receiving increasing attention.

[0069] The battery devices in the related art have problems with low reliability and poor anti-extrusion ability when dealing with side extrusion. After further in-depth analysis of the side extrusion working conditions of the battery devices in the related art, it can be seen that when the battery device is subjected to side extrusion, the box and the battery cell are in direct contact, and the external force is transmitted to the single battery cell through this direct contact. Since this contact method is mostly point contact, the force generated by the extrusion acts more concentratedly on the local position of a single battery cell. Even a small extrusion force can easily cause deformation, breakage and other problems in the battery cell, making it difficult for the side anti-extrusion ability of the entire battery device to reach an ideal state, which in turn causes the battery device to have low reliability.

[0070] In order to alleviate the problem of low reliability of battery cells, the structure of the battery device can be improved, and new structural parts can be added between the box and the battery module. When the battery device is subjected to side extrusion force, the side extrusion force can be transferred to multiple battery cells through the new structural parts, thereby reducing the side extrusion force borne by a single battery cell, making the extrusion force borne by each battery cell smaller, and reducing the probability of battery cell damage.

[0071] Based on the above considerations, and to address the issue of battery devices' poor resistance to lateral extrusion, which leads to low reliability, the inventors, after in-depth research, have designed a battery device comprising a housing, a battery module, and a buffer. The housing comprises a bottom wall and side walls, the side walls being arranged around the bottom wall to form a housing cavity. The side walls comprise a first wall disposed opposite each other along a first direction and a second wall disposed opposite each other along a second direction, the first and second walls intersecting and respectively connected to the bottom wall. The battery module is disposed within the housing cavity and comprises a battery cell arrangement assembly and end plates. The battery cell arrangement assembly comprises a plurality of battery cells stacked along a first direction, the end plates being disposed at each end of the battery cell arrangement structure in the first direction, and the battery cell arrangement assembly being spaced apart from the second wall in the second direction to form a gap. The buffer is disposed in the gap, and its relative position to at least one of the battery cell arrangement assembly and the housing is fixed. The buffer's orthographic projection in the second direction covers the plurality of battery cells distributed along the first direction.

[0072] In such a battery device, end plates are provided at both ends in the first direction, at least partially absorbing the lateral extrusion force borne by the first wall through the end plates, thereby reducing damage to the battery cells due to the lateral extrusion force in the first direction. At the same time, a gap is formed between the battery cell arrangement assembly and the second wall in the second direction, and a buffer is provided in the gap. The relative position of the buffer to at least one of the battery cell arrangement assembly and the housing is fixed, and the positive projection of the buffer in the second direction covers multiple battery cells distributed along the first direction. This changes the traditional point contact force transmission method. When the side of the battery device, such as the second wall, is squeezed, the external force no longer directly concentrates on the local position of a single battery cell. Instead, it is first transmitted from the housing to the buffer, and then the squeezing force is dispersed to multiple battery cells through the buffer. This significantly reduces the pressure peak borne by the single battery cell and avoids deformation and damage caused by local stress concentration.

[0073] The technical solutions described in the embodiments of the present application are applicable to power-consuming devices or energy storage devices using battery devices.

[0074] The energy storage device includes one or more battery clusters to increase the voltage and capacity of the energy storage device. A 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. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device. The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device can store electrical energy as needed and output it at the appropriate time. For example, the energy storage device can store electrical energy during low-consumption periods and provide electricity to relevant users or electrical equipment during peak usage periods.

[0075] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0076] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices, energy storage devices, etc. described above. For the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0077] For example, Figure 1 As shown, the vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 200, a controller 300 and a battery device 100 can be provided inside the vehicle 1, and the controller 300 is used to control the battery device 100 to power the motor 200. For example, the battery device 100 can be provided at the bottom, front or rear of the vehicle 1. The battery device 100 can be used to power the vehicle 1, for example, the battery device 100 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements of the vehicle 1 during startup, navigation and operation. In another embodiment of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0078] It should be understood that the technical solutions described in the embodiments of the present application are not limited to being applicable to the above-mentioned vehicle 1, but can also be applied to energy storage devices.

[0079] like Figures 2 to 7As shown, to meet different power requirements, the battery device 100 may include a housing 10, a battery module 20, and a buffer member 30. The housing 10 includes a bottom wall 111 and side walls 112. The side walls 112 are arranged around the bottom wall 111 to enclose a receiving cavity 113. The side walls 112 include first walls 1121 arranged opposite each other along a first direction X and second walls 1122 arranged opposite each other along a second direction Y. The first walls 1121 and the second walls 1122 intersect and are respectively connected to the bottom wall 111. The battery module 20 is disposed within the receiving cavity 113 and includes a battery cell arrangement assembly 21 and an end plate 22. The battery cell arrangement assembly 21 includes a plurality of battery cells 211a stacked along the first direction X. The end plates 22 are provided at both ends of the battery cell arrangement assembly 21 in the first direction X. The battery cell arrangement assembly 21 is spaced apart from the second wall 1122 in the second direction Y, forming a gap 60. The buffer 30 is disposed in the gap 60 . The relative position of the buffer 30 to at least one of the battery cell arrangement assembly 21 and the housing 10 is fixed. The orthographic projection of the buffer 30 in the second direction Y covers the battery cells 211 a distributed along the first direction X.

[0080] The housing 10 may be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere, and the present embodiment is not limited thereto. The housing 10 may be made of an alloy material such as an aluminum alloy or an iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin, and the present embodiment is not limited thereto.

[0081] The housing 10 is used to house the battery module 20 and can have various structures. Optionally, the battery device 100 can also include a top cover 50. The top cover 50 and the housing 10 cover each other, protecting the battery module 20 and reducing the risk of environmental corrosion to the battery cells 211a. The top cover 50 can be a plate-like structure or a hollow structure with one side open. The protective structure formed by the housing 10 and the top cover 50 can have various shapes, such as a rectangular parallelepiped or a cube.

[0082] The first direction X may be understood as the length direction of the battery device 100 , and the second direction Y may be understood as the width direction of the battery device 100 .

[0083] The first wall 1121 and the second wall 1122 may be alternately arranged around the bottom wall 111 . The first wall 1121 , the second wall 1122 and the bottom wall 111 may adopt an integrated structure, or may be connected and fixed by bonding, welding or the like.

[0084] The battery module 20 is disposed in the accommodating cavity 113 of the housing 10, and its battery cell arrangement assembly 21 can be a collective term for all battery cells 211a included in the battery module 20. The battery cell arrangement assembly 21 can include multiple battery cells 211a. If there are multiple battery cells 211a, the multiple battery cells 211a can be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 211a are connected in both series and parallel. The multiple battery cells 211a can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 211a is matched with the end plate 22. Optionally, the multiple battery cells 211a of the battery cell arrangement assembly 21 can be located between two end plates 22 arranged opposite each other in the first direction X. Connectors can be used to fix the relative positions of the end plates 22 and the battery cell arrangement assembly 21. Connectors include, but are not limited to, binding and fixing with straps, connecting and fixing a connecting plate to two end plates, and connecting and fixing a pressure strip to two end plates or to the battery cells.

[0085] The battery cell 211 a may be a secondary battery. A secondary battery refers to a battery cell 211 a that can be continuously used by activating active materials by charging after the battery cell 211 a is discharged.

[0086] The battery cell 211a can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in this embodiment of the present application.

[0087] The outer shell of the battery cell 211a can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film. In some embodiments, the outer shell protects the electrode assembly 2112. A sealing bag is provided between the outer shell and the electrode assembly 2112 to encapsulate the electrode assembly 2112 and the electrolyte. Specifically, the sealing bag can be a bag-shaped buffer 30 or an aluminum-plastic film. When the outer shell is a sealed structure, it encapsulates the electrode assembly 2112, the electrolyte, and other components.

[0088] As an example, the battery cell 211a can be a cylindrical battery cell 211a, a prismatic battery cell 211a, a soft-pack battery cell 211a or a battery cell 211a of other shapes. The prismatic battery cell 211a includes a square-shell battery cell 211a, a blade-shaped battery cell 211a, a polygonal battery, and the polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in this application.

[0089] A gap 60 may be formed between the battery module 20 and one of the second walls 1122. Accordingly, the number of buffer members 30 may be one and disposed in the corresponding gap 60. Of course, gaps 60 may also be formed between the battery module 20 and both second walls 1122. Accordingly, a buffer member 30 may be disposed in each gap 60 between the second wall 1122 and the battery module 20.

[0090] The orthographic projection of the buffer member 30 in the second direction Y may cover at least two battery cells 211a distributed along the first direction X. Optionally, the multiple battery cells 211a of the battery module 20 may be arranged in multiple rows, and the multiple rows of battery cells 211a may be distributed along the second direction Y. The orthographic projection of the buffer member 30 in the second direction Y may cover at least two battery cells 211a in the outermost row of adjacently arranged cells.

[0091] The buffer member 30 may include a structural member having a cavity. Of course, the buffer member 30 may also include a solid structure such as foam, rubber, etc. Optionally, the buffer member 30 may be deformed under a predetermined pressure.

[0092] The buffer member 30 can be connected to the battery cell arrangement assembly 21 and fixed in relative position, for example, by bonding or other means. Accordingly, the buffer member 30 and the box body 10 can be in contact or have an installation gap.

[0093] Of course, in some embodiments, the buffer 30 can be connected to the housing 10 and fixed relative to it. The buffer 30 and the housing 10 can be bonded, welded, or integrated to ensure a fixed relative position. Accordingly, the buffer 30 and the battery cell arrangement assembly 21 can be in contact or have a gap therebetween.

[0094] In a battery device 100 provided in one embodiment of the present application, side extrusion generally includes extrusion of the side wall 112 in a first direction X and extrusion of the side wall 112 in a second direction Y. Since end plates 22 are provided at both ends in the first direction X, the end plates 22 at least partially absorb the side extrusion force borne by the first wall 1121, thereby reducing damage to the battery cell 211a due to the side extrusion force in the first direction X. At the same time, a gap 60 is formed between the battery cell arrangement assembly 21 and the second wall 1122 in the second direction Y, and a buffer 30 is arranged in the gap 60. The relative position of the buffer 30 to the battery cell arrangement assembly 21 and at least one of the box body 10 is fixed, and the positive projection of the buffer 30 in the second direction Y covers multiple battery cells 211a distributed along the first direction X, thereby changing the traditional point contact force conduction method. When the side of the battery device 100, such as the second wall 1122, is squeezed, the external force is no longer directly concentrated on the local position of a single battery cell 211a, but is first transmitted to the buffer 30 by the box body 10, and then the squeezing force is dispersed to multiple battery cells 211a through the buffer 30, which significantly reduces the pressure peak of the single battery cell 211a and avoids deformation and damage caused by local stress concentration.

[0095] Furthermore, the buffer member 30 is designed to be relatively fixed to at least one of the battery cell arrangement assembly 21 and the housing 10, and there is no need to make substantial changes to the core structure of the battery device 100 in the related art (such as the battery module 20 and the housing). This design has good structural compatibility and production process adaptability, facilitating large-scale industrial application and promotion.

[0096] In some embodiments, along the second direction Y, the buffer 30 has a mating surface 30 a disposed toward the battery cell arrangement assembly 21 , and an orthographic projection of the mating surface 30 a in the second direction Y covers a plurality of battery cells 211 a distributed along the first direction X.

[0097] The mating surface 30 a may include a surface disposed parallel to a wall surface of the battery cell 211 a disposed toward the mating surface 30 a.

[0098] In the second direction Y, the orthographic projection of the matching surface 30 a may partially or completely cover the battery cell 211 a located at the outermost side in the second direction Y.

[0099] The battery device 100 provided in one embodiment of the present application converts the stress concentration problem of traditional point / line contact into a surface-distributed stress conduction mode by providing a mating surface 30a that forms surface contact with multiple battery cells 211a. When the battery device 100 is squeezed from the side, the mating surface 30a of the buffer 30 can bear the squeezing force transmitted by the box 10 with a larger area, and distribute the force evenly to the surfaces of multiple battery cells 211a through surface contact, avoiding local areas from being subjected to excessive high pressure. Surface contact can reduce the force per unit area, effectively improve the uniformity and efficiency of force conduction, and further reduce the risk of deformation of the battery cells 211a due to stress concentration.

[0100] Furthermore, by establishing a contact pattern for the mating surface 30a, the stress on individual battery cells 211a is dispersed, thereby indirectly improving the structural durability of the battery device 100. During long-term use or repeated extrusion and impact conditions, the stress on the battery cells 211a remains at a low level, effectively delaying the occurrence of problems such as fatigue damage to the outer shell material of the battery cells 211a and deformation of the electrode assembly. Furthermore, the stable surface contact relationship reduces frictional losses between the buffer 30 and the battery cells 211a, lowering the risk of performance degradation due to component wear and further ensuring the reliability of the battery device 100.

[0101] like Figures 2 to 7 As shown, in some embodiments, the buffer member 30 also includes a guide surface 30b arranged opposite to the mating surface 30a along the second direction Y, and the guide surface 30b is arranged at an angle. The vertical distance from the end of the guide surface 30b facing the bottom wall 111 to the mating surface 30a is d1, and the vertical distance from the end of the guide surface 30b away from the bottom wall 111 to the mating surface 30a is d2, wherein d2>d1.

[0102] The guide surface 30b includes an inclined surface, which can be a plane, that is, a single plane structure along the inclined direction. During the assembly process with the box 10, the plane provides a stable and direct guiding effect for the buffer 30; it can also be a folded surface formed by splicing multiple planes. Through the combination of planes at different angles, a more complex guiding path is formed to adapt to the assembly requirements of the box 10 with special shapes.

[0103] The battery device 100 provided in one embodiment of the present application, by providing a guide surface 30b, and making the guide surface 30b tilted outward, can better adapt to the shape of the box body 10, so that the buffer 30 and the box body 10 are well matched, improving the stability and reliability of the entire structure, and reducing the shaking or displacement caused by loose fit. In addition, the structural form of the guide surface 30b, which is small at the bottom and large at the top, plays a guiding role during assembly. The assembler can more smoothly align the buffer 30 with the installation position of the box body 10, and gradually install the buffer 30 into the box body 10 along the tilt direction of the guide surface 30b, which reduces the difficulty of assembly and improves assembly efficiency. It also helps to reduce damage to the buffer 30 or the box body 10 during the assembly process.

[0104] Furthermore, this structural design enables the buffer member 30 to more effectively disperse the force onto the housing 10 when subjected to external impact. The guide surface 30b can also be designed to adapt to the shape of the housing 10, making full use of the space inside the housing 10. This allows the buffer member 30 to achieve optimal cushioning effect and installation stability within a limited space, thus helping to optimize the spatial layout of the entire device.

[0105] like Figures 2 to 7 As shown, in some embodiments, a buffer cavity 30 c is provided inside the buffer member 30 .

[0106] The buffer cavity 30c can be a single, independent cavity structure or a combination of multiple cavities. A single buffer cavity 30c has a simple design and can focus its buffering effect in a specific direction. Multiple buffer cavities 30c can be rationally arranged to disperse the force from different angles and areas, improving the buffering effect.

[0107] The buffer cavity 30c can be shaped in a variety of ways, including common cylindrical cavities (e.g., cylinders and prisms). These shapes are easy to manufacture and provide stable cushioning performance in both the axial and radial directions. Alternatively, a honeycomb cavity structure can be employed. This structure, while ensuring lightweight, efficiently absorbs and disperses external forces through its unique mechanical properties. Furthermore, irregular shapes such as spherical and conical buffer cavities 30c can be designed based on actual stress conditions and spatial layout to accommodate complex application scenarios.

[0108] The battery device 100 provided by one embodiment of the present application has the above-mentioned configuration. When the buffer 30 is subjected to lateral extrusion force, the presence of the buffer cavity 30c enables the buffer 30 to deform under pressure. Taking the metal buffer 30 as an example, the buffer cavity 30c inside it will cause the metal wall to elastically deform when subjected to force, converting part of the lateral extrusion force into the elastic potential energy of the buffer 30 itself. For non-metallic buffers 30, such as hard rubber, the buffer cavity 30c can cause the rubber material to compress and deform under pressure, absorbing energy. By absorbing the lateral extrusion force by the buffer cavity 30c, the lateral extrusion force transmitted to the battery cell 211a can be effectively reduced, reducing the impact of external force on the battery cell 211a, further ensuring the structural safety and stable performance of the battery cell 211a, reducing the risk of failure of the battery device 100 due to external force impact, and improving the reliability of the entire battery system.

[0109] In some embodiments, the buffer component 30 is a solid structure, and the buffer component 30 includes at least one of foam and rubber.

[0110] The buffer member 30 may include one of foam and rubber. Of course, it may also include both foam and rubber. When both are included, the two may be stacked.

[0111] The battery device 100 provided by one embodiment of the present application has the above-mentioned arrangement, in which the buffer 30 adopts a solid structure and includes at least one of foam and rubber, and can realize force transmission in the form of surface contact. In addition, materials such as foam and rubber have good elasticity and deformation ability. When the battery device 100 is subjected to lateral extrusion force, the solid structure buffer 30 can be compressed and deformed, converting the external extrusion force into its own elastic potential energy or internal friction heat energy, thereby absorbing a large amount of energy. Taking foam as an example, the bubble structure inside it will collapse and deform when under pressure, consuming the extrusion energy; rubber absorbs energy through deformation such as stretching and twisting of the molecular chain. This effective energy absorption mechanism further reduces the extrusion force transmitted to the battery cell 211a, provides more reliable buffer protection for the battery cell 211a, and further improves the safety and reliability of the battery device 100 when subjected to lateral extrusion.

[0112] like Figures 2 to 7 As shown, in some embodiments, the battery module 20 further includes a pressure strip 23 . The pressure strip 23 abuts against one end of at least two battery cells 211 a away from the bottom wall 111 . The pressure strip 23 is fixedly connected to the buffer member 30 .

[0113] The clamping strip 23 can have various shapes, such as an elongated strip or an L-shaped strip. The elongated strip 23 is suitable for linearly arranged battery cells 211a, applying uniform pressure along the arrangement of the battery cells 211a. The L-shaped strip 23 can be used at the edges of the battery module 20 to secure the corners of the battery cells 211a. Its cross-sectional shape can be rectangular, circular, or trapezoidal. For example, a rectangular cross-section of the strip 23 facilitates flat contact with the battery cells 211a, while a circular cross-section is advantageous in certain scenarios where stress concentration needs to be reduced.

[0114] The bead 23 can be made of metal (such as aluminum alloy or stainless steel). Metal has high strength and rigidity, can withstand significant pressure, and ensures a secure hold on the battery cells 211a. Alternatively, non-metallic materials such as high-strength engineering plastics (such as polycarbonate or nylon) can be used. These materials offer excellent insulation, are lightweight, and are relatively low-cost. They also prevent electrochemical corrosion that can occur from direct contact between the metal and the battery cells 211a. Furthermore, the bead 23 can be treated with special surface treatments, such as anti-slip or insulating coatings, to enhance friction or insulation between the bead and the battery cells 211a.

[0115] The number of hold-down bars 23 can be adjusted based on the number and arrangement of battery cells 211a. For modules consisting of a small number of battery cells 211a, a single hold-down bar 23 is sufficient for securing the battery. For larger battery modules 20, multiple hold-down bars 23 can be installed, spaced across the top of the battery cell arrangement assembly 21, to provide a more uniform and reliable secure fit.

[0116] The beading 23 and the buffer 30 can be connected and fixed in a variety of ways. A common method is bonding, using a high-strength insulating adhesive to firmly bond the beading 23 and the buffer 30. This method is simple to use and is applicable to beadings 23 and buffers 30 of various shapes. Mechanical connections, such as screws or snaps, can also be used. Screw connections offer high connection strength and facilitate disassembly and maintenance, while snap connections offer the advantages of quick and convenient installation. Furthermore, the beading 23 and the buffer 30 can be integrally formed through injection molding, which minimizes the number of parts and improves the reliability and integrity of the connection.

[0117] In one embodiment of the present application, a battery device 100 is provided in which a pressure strip 23 abuts the ends of at least two battery cells 211a facing away from the bottom wall 111, tightly connecting the multiple battery cells 211a together to form a stable, integrated structure. When the battery device 100 is subjected to vibration, impact, or transportation, the pressure strip 23 effectively limits the relative displacement and movement of the battery cells 211a, preventing problems such as outer casing wear and electrode damage caused by collision and friction between the battery cells 211a. This ensures the structural integrity of the battery cell arrangement assembly 21 and, in turn, improves the reliability of the battery module 20.

[0118] Connecting and securing the holding strip 23 and buffer 30 to form an integrated component reduces the number of parts in the battery module 20. Compared to separately installing the holding strip 23 and buffer 30, this integrated design reduces assembly complexity, steps, and time, thereby improving production efficiency. Furthermore, the reduced number of parts also reduces procurement and inventory management costs, as well as quality issues caused by improper component assembly, helping to lower the production and maintenance costs of the entire battery assembly 100.

[0119] In some embodiments, the pressure strip 23 and the buffer member 30 are an integrated structure, and the pressure strip 23 and the buffer member 30 are respectively bonded and fixed to a plurality of battery cells 211 a distributed along the first direction X.

[0120] The battery cells 211 a arranged in the outermost row along the second direction Y may have their surfaces facing the second wall 1122 bonded to the buffer member, and their surfaces facing away from the bottom wall 111 may be bonded to the pressure strip 23 .

[0121] In one embodiment of the present application, the battery assembly 100 integrates the holding strip 23 and the buffer 30 into a one-piece structure, which increases the restraint on the battery cells 211a from multiple dimensions. The holding strip 23 and the buffer 30 connect multiple battery cells 211a at different locations to form a single unit, further improving the integrity and stability of the battery cell arrangement assembly 21. Furthermore, the holding strip 23 and the buffer 30 further disperse the compressive force, thereby enhancing the reliability of the battery assembly 100.

[0122] like Figures 2 to 7 As shown, in some embodiments, the battery module 20 further includes a strap 24 , which is tied around the periphery of the battery cell arrangement assembly 21 . A groove 231 is provided on the pressure strip 23 , and a portion of the strap 24 is located in the groove 231 .

[0123] The cross-sectional shape of the binding strap 24 can be varied. Options include a flat strip, which provides a larger contact area with the outer periphery of the battery cell arrangement assembly 21, allowing for uniform application of binding force and preventing excessive localized pressure. Alternatively, the binding strap 24 can have a circular or elliptical cross-section. In some special designs, a circular or elliptical cross-sectional shape of the binding strap 24 facilitates insertion through a specifically shaped hole or groove 231 for securement.

[0124] The strap 24 can be a one-piece structure, where the entire strap 24 is a continuous unit secured by knotting, snapping, or other methods. Alternatively, it can be a segmented structure, consisting of multiple strap segments 24 connected by connectors (such as bolts or rivets). The segmented structure facilitates flexible adjustment and installation based on the size of the battery cell arrangement assembly 21. Furthermore, the strap 24 can be provided with anti-slip patterns or raised structures on its surface to increase friction with the battery cells 211a or the pressure strips 23, preventing the strap 24 from slipping during use.

[0125] The strap 24 can be bundled around the periphery of the battery cell arrangement assembly 21, and the specific location can be the middle area of ​​the battery cell arrangement assembly 21 to evenly constrain the entire assembly; it can also be distributed at multiple locations at both ends and the middle of the assembly to form multi-point bundling, further enhancing the constraint effect and preventing the battery cell 211a from displacing in different directions.

[0126] The strap 24 can directly contact the surface of the battery cell 211a. To prevent damage to the surface of the battery cell 211a, a soft cushioning layer (such as a rubber pad or sponge pad) can be provided on the side of the strap 24 that contacts the battery cell 211a. This protects the insulation layer and outer shell of the battery cell 211a and increases friction. Alternatively, the strap 24 can indirectly contact the battery cell 211a through an intermediate component (such as an insulating plastic sheet) to provide isolation and protection.

[0127] When there are multiple straps 24, the portion of the strap 24 corresponding to the strip 23 with the groove 231 can be set in the groove 231. For example, the strap 24 located at a convenient edge position in the second direction Y can be located in the groove 231 corresponding to the strip 23.

[0128] The battery device 100 provided in one embodiment of the present application is capable of securely restraining multiple battery cells 211a together by providing a binding strap 24, preventing the battery cells 211a from relative displacement or loosening when the battery device 100 is subjected to vibration, impact, or external force, thereby ensuring the structural stability of the battery cell arrangement assembly 21 and thus guaranteeing the reliability of the battery device 100. The provision of the groove 231 on the pressure strip 23 facilitates the positioning and installation of the corresponding binding strap 24. Furthermore, the binding strap 24 can work together with the pressure strip 23, the buffer 30, and other components to form a stable overall structure, optimizing the force transmission path. When the battery device 100 is subjected to external force, the binding strap 24 cooperates with the pressure strip 23 and the buffer 30 to disperse the external force, reducing the risk of excessive local force on the battery cells 211a.

[0129] It is understandable that the above embodiments are all described by taking the example of the buffer member 30 being connected to the battery cell arrangement assembly 21 and forming an integrated structure with the pressure strip 23 , which is an optional implementation.

[0130] like Figure 8 As shown, in some embodiments, the buffer member 30 includes a buffer plate 31 and a plurality of connecting ribs 32 , each connecting rib 32 being arranged on a side of the buffer plate 31 away from the battery cell arrangement assembly 21 in the second direction Y, and the connecting rib 32 being connected and fixed to the second wall 1122 .

[0131] In other words, the buffer member 30 may be connected and fixed to the second wall 1122 of the box body 10 .

[0132] When the buffer member 30 includes a buffer plate 31 , the mating surface 30 a may be a surface of the buffer plate 31 facing the battery cell 211 a in the second direction Y.

[0133] The connection between the buffer member 30 and the housing 10 can be integrally formed, such as by simultaneously forming the buffer member 30 and the housing 10 through injection molding or compression molding. Alternatively, the buffer member 30 and the housing 10 can be securely connected later by welding (such as ultrasonic welding or heat-melting welding) to enable the two to deform and transmit force in coordination when subjected to force.

[0134] The shape of the buffer plate 31 can be adapted to the shapes of the battery cell array assembly 21 and the housing 10, and can be a flat plate or a curved plate, as long as it faces the outermost battery cells 211a and provides both buffering and force dispersal. Its dimensions, as projected in the second direction Y, must cover multiple battery cells 211a distributed along the first direction X to ensure effective dispersion of lateral extrusion forces.

[0135] Depending on actual design requirements, two or more connecting ribs 32 may be provided. The connecting ribs 32 may be cylindrical, strip-shaped, or have cross-sectional shapes such as circular, square, or rectangular. Furthermore, the connection between the connecting ribs 32, the buffer plate 31, and the housing 10 may be designed with reinforcement features, such as rounded corners or increased thickness, to enhance connection strength. The layout of the connecting ribs 32 is also diverse and can be uniformly distributed, symmetrically distributed, or unevenly distributed depending on the load conditions.

[0136] The buffer plate 31, the box body 10 and the connecting ribs 32 form a plurality of buffer cavities 30c in a hole format. The shape of the buffer cavity 30c can be square, rectangular, diamond, irregular polygon, etc.

[0137] In a battery device 100 provided by one embodiment of the present application, the buffer member 30 is connected to the housing 10 as an integral whole. Compared with independently arranged buffer members 30, the connection gap 60 and relative movement between the components are reduced, so that the entire structure of the battery device 100 can work more collaboratively when subjected to lateral extrusion. This integrated structure enhances the overall rigidity of the battery device 100, reduces the risk of damage to the battery cell 211a due to loose or falling components, and improves the reliability of the battery device 100 under complex working conditions. At the same time, the buffer plate 31 is arranged facing the outermost battery cell 211a, and forms a buffer cavity 30c with the housing 10 through the connecting rib 32. When the battery device 100 is subjected to lateral pressure, the buffer plate 31 is the first to bear the external force. Due to the presence of the buffer cavity 30c, the buffer plate 31 can undergo a certain degree of elastic deformation, converting mechanical energy into elastic potential energy, thereby absorbing part of the lateral extrusion force. At the same time, the buffer plate 31 disperses the force to multiple battery cells 211a distributed along the first direction X through surface transmission. Compared with the traditional point contact force transmission method, it greatly reduces the local pressure on a single battery cell 211a, effectively avoids the deformation and damage of the battery cell 211a due to local stress concentration, and significantly improves the side extrusion resistance of the battery device 100.

[0138] In some embodiments, the box body 10 includes a non-metal box body 11 , and the non-metal box body 11 includes a bottom wall 111 and side walls 112 .

[0139] The non-metallic box body 11 can be made of polymer materials, including plastic materials such as polypropylene (PP), polyethylene (PE), and polycarbonate (PC). These materials have excellent molding and processing properties and can be formed into various complex box body 10 structures through processes such as injection molding and blow molding. Composite materials can also be made, including fiber-reinforced composite materials such as glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP). These materials combine the high strength of fibers with the moldability of the matrix material, resulting in high specific strength and high specific modulus.

[0140] The non-metal box body 11 can be formed as a whole by integral injection molding.

[0141] The upper cover 50 can be connected and fixed to the non-metal box body 11 .

[0142] The battery device 100 provided in one embodiment of the present application, by making the box body 10 include a non-metallic box body 11, the non-metallic material itself is non-conductive, which can effectively prevent the occurrence of short circuits between the electrodes inside the battery device 100 and the box body 10, thereby improving the electrical reliability of the battery device 100. During the use of the battery device 100, even if abnormal conditions such as damage to the battery cell 211a or electrolyte leakage occur, the non-metallic box body 11 can prevent the current from being conducted through the box body 10 to a certain extent, reducing the risk of safety accidents such as fire and explosion caused by short circuits. In addition, the use of the non-metallic box body 11 can significantly reduce the overall weight of the battery device 100. For application scenarios such as electric vehicles, the lightweight battery device 100 helps to increase the cruising range of the vehicle 1 and reduce energy consumption; at the same time, the lightweight battery device 100 is more convenient during transportation and installation, which can reduce manpower and material costs.

[0143] like Figures 2 to 8 As shown, in some embodiments, the battery device 100 further includes a heat exchange element 40 . The heat exchange element 40 is disposed in the accommodating cavity 113 , and the heat exchange element 40 is disposed between the bottom wall 111 and the battery module 20 .

[0144] The shape of the heat exchange element 40 can be flexibly designed according to the spatial layout of the battery module 20 and the bottom wall 111 of the box 10. It can optionally include a flat heat exchanger, which has a simple structure, is easy to install, and can fit evenly between the bottom wall 111 and the battery module 20; it can also include a serpentine-shaped heat exchanger.

[0145] The interior of the heat exchange element 40 may be designed as a hollow structure, filled with a cooling liquid channel, and heat is removed by liquid circulation. This form has high heat dissipation efficiency and is suitable for high-power battery devices 100.

[0146] Optionally, to further enhance heat exchange performance, the surface of the heat exchange element 40 may be subjected to special treatments. For example, anodizing can be used to form a porous oxide film on the aluminum alloy surface, increasing the surface area and improving corrosion resistance. Surface coatings such as silver plating or nickel plating can also be used to reduce surface thermal resistance and improve heat transfer efficiency. Alternatively, a high-thermal-conductivity coating, such as graphene thermal conductive coating, can be applied to enhance surface heat transfer capabilities.

[0147] The heat exchange element 40 can be fixed between the bottom wall 111 of the box 10 and the battery module 20 by a high thermal conductivity adhesive. The adhesive must have good insulation and temperature resistance to ensure firm fixation without affecting heat conduction, such as silicone thermal adhesive.

[0148] Of course, a snap-fit ​​structure may also be provided on the heat exchange component 40, the bottom wall 111 of the box body 10 or the battery module 20 to enable quick installation and removal through the snap-fit, thereby facilitating maintenance and replacement and avoiding aging problems that may be caused by the adhesive.

[0149] In a battery device 100 provided in one embodiment of the present application, a heat exchange element 40 rapidly transfers heat generated by the battery cells 211a to other locations, overcoming the limitations of the plastic or non-metallic housing 10 in terms of poor heat dissipation. Whether dissipating heat through solid heat conduction, liquid circulation, or air convection, the heat exchange element 40 effectively reduces the temperature of the battery cells 211a, preventing overheating due to heat accumulation. This ensures that the battery operates within a suitable temperature range, improving its charge and discharge performance and reliability.

[0150] like Figures 2 to 8 As shown, in some embodiments, the battery device 100 also includes a metal component 12, which is arranged outside the accommodating cavity 113. The metal component 12 includes a supporting member 121 and a mounting member 122. The supporting member 121 is supported on the side of the bottom wall 111 away from the accommodating cavity 113, and the mounting member 122 is protruding from the side of the side wall 112 away from the accommodating cavity 113.

[0151] The supporting member 121 and the mounting member 122 of the metal component 12 can be directly connected or indirectly connected through other transition pieces. The supporting member 121 and the mounting member 122 can be formed by at least one of extruded profiles, sheet metal stamping and welding, etc.

[0152] The support member 121 is supported on the side of the bottom wall 111 facing away from the accommodating cavity 113, which can be understood as follows: the orthographic projection of the support member 121 on the bottom wall 111 can cover at least a portion of the bottom wall 111. In the first direction X, the weight of the non-metallic box 10 and its internal components, such as the battery cells 211a, can act on the support member 121, providing support and bearing capacity.

[0153] The support member 121 and the outer surface of the bottom wall 111 can be bonded to form a continuous support surface, evenly transferring the weight of the battery cell 211a to the external structure. The support member 121 includes but is not limited to a support plate, a support beam and other load-bearing structures.

[0154] The mounting part 122 is used to connect with a target device such as a chassis of the vehicle 1 or other structures. The mounting part 122 may be provided with a mounting position, which includes but is not limited to a mounting sleeve, a hook or other structural forms.

[0155] The mounting member 122 is protruding from the side of the side wall 112 away from the accommodating cavity 113 , which can be understood as follows: the mounting member 122 is disposed on the outer side of the side wall 112 away from the accommodating cavity 113 .

[0156] The mounting member 122 may extend outward from a side of the sidewall 112 away from the receiving cavity 113 to form a physical connection point, so that the battery device 100 can be stably installed on the target device.

[0157] The battery device 100 provided in one embodiment of the present application, through the above-described arrangement, facilitates connection of the battery device 100 with other components of an electrical device via the mounting member 122, thereby ensuring mounting requirements. The supporting member 121 can be supported on the side of the bottom wall 111 facing away from the accommodating cavity 113, and together with the non-metallic housing 10, supports the battery cell 211a, ensuring the supporting capacity of the battery cell 211a.

[0158] In some embodiments, the non-metallic box body 11 further includes an extension section 114 , one end of the extension section 114 is connected to the side wall 112 and the other end extends away from the accommodating cavity 113 , and the mounting member 122 and the extension section 114 are at least partially stacked and connected.

[0159] The extension section 114 and the side wall 112 may be connected by bonding or an integral structure, and an integral structure may be selected.

[0160] Along the third direction Z, or in other words, along the height direction of the battery device 100 , the orthographic projection of the extension section 114 and the orthographic projection of the mounting component 122 may at least partially overlap.

[0161] A locking nut may be embedded in one of the mounting member and the extension 114. A blind hole may be provided in the other of the mounting member and the extension 114, and the locking nut may be embedded in the blind hole.

[0162] The screw rod may be provided with an end cap, which is inserted into the corresponding insertion hole and threadedly connected to the locking nut. The end cap of the screw rod may abut against the side of the metal component 12 facing away from the non-metallic box body 10 .

[0163] When the locking nut is embedded in the extension section 114 , a plug-in hole may be provided in a corresponding area of ​​the mounting member 122 .

[0164] The battery device 100 provided in one embodiment of the present application, through the above-mentioned configuration, helps to ensure the connection strength requirements between the non-metallic box 10 and the metal component 12, while also helping to meet the mounting requirements.

[0165] like Figures 2 to 8As shown, in some embodiments, the battery cell arrangement assembly 21 includes multiple battery groups 211 distributed along the second direction Y, each battery group 211 includes multiple battery cells 211a distributed along the first direction X, and the positive projection of the end plate 22 in the first direction X covers each battery group 211. In the second direction Y, buffer members 30 are respectively arranged between the two outermost battery groups 211 and the corresponding second walls 1122.

[0166] The number of battery packs 211 may be two, three, or more.

[0167] Each battery pack 211 includes the same number of battery cells 211 a and is arranged one-to-one in the second direction Y. Optionally, a binding strap 24 may be provided corresponding to each battery pack 211 .

[0168] In the second direction Y, buffer members 30 are respectively disposed between the two outermost battery packs 211 and the corresponding second walls 1122. The orthographic projection of each buffer member 30 in the second direction Y covers each battery cell 211a of the battery pack 211 on the corresponding side.

[0169] The battery device 100 provided in one embodiment of the present application facilitates the arrangement and combination of multiple battery cells 211 a through the above configuration, and at the same time, helps ensure the reliability of the battery device 100 when it withstands lateral extrusion forces in different directions.

[0170] In some embodiments, the battery cell 211a includes a shell 2111, an electrode assembly 2112 and an end cover assembly 2113. The electrode assembly 2112 is arranged in the shell 2111, and the end cover assembly 2113 is covered at the opening of the shell 2111. The shell 2111 includes a first shell wall 2111a and a second shell wall 2111b that are arranged to intersect with each other. The area of ​​the first shell wall 2111a is larger than the area of ​​the second shell wall 2111b. The first shell wall 2111a is arranged toward the end plate 22, and the second shell wall 2111b is arranged toward the buffer 30. Along the second direction Y, the buffer 30 covers the second shell wall 2111b of each battery cell 211a of the outermost battery group 211.

[0171] The first shell wall 2111 a may correspond to a wall surface in a large-surface direction of the battery cell 211 a or a wall surface in an expansion direction of the battery cell 211 a .

[0172] The battery cell 211a provided in one embodiment of the present application facilitates at least partial absorption of the lateral extrusion force exerted on the first wall 1121 by the end plate 22, thereby reducing damage to the battery cell 211a due to the lateral extrusion force exerted in the first direction X. Furthermore, when the side surface of the battery device 100, such as the second wall 1122, is squeezed, the external force no longer acts directly and concentratedly on a localized portion of a single battery cell 211a. Instead, the external force is first transmitted from the housing 10 to the buffer 30, which then distributes the squeezing force to each battery cell 211a of the outermost battery pack 211. This significantly reduces the peak pressure exerted on the individual battery cells 211a and avoids deformation and damage caused by localized stress concentration.

[0173] A battery cell 211a provided in one embodiment of the present application includes a box body 10, a battery module 20 and a buffer member 30. The box body 10 includes a non-metallic box body 11 and a metal component 12. The non-metallic box body 11 includes a bottom wall 111 and a side wall 112. The side wall 112 is arranged around the bottom wall 111 and encloses a accommodating cavity 113. The side wall 112 includes a first wall 1121 arranged opposite to each other along a first direction X and a second wall 1122 arranged opposite to each other along a second direction Y. The first wall 1121 and the second wall 1122 intersect and are respectively connected to the bottom wall 111. The battery module 20 is disposed in the accommodating cavity 113. The battery cell arrangement assembly 21 includes four battery groups 211 distributed along the second direction Y. Each battery group 211 includes a plurality of battery cells 211a distributed along the first direction X. The orthographic projection of the end plate 22 in the first direction X covers each battery group 211. In the second direction Y, a buffer member 30 is respectively provided between the two outermost battery groups 211 and the corresponding second wall 1122. The battery cell 211a includes a shell 2111, an electrode assembly 2112, and an end cap assembly 2113. The electrode assembly 2112 is provided in the shell 21 11, the end cover assembly 2113 is covered at the opening of the shell 2111, and the shell 2111 includes a first shell wall 2111a and a second shell wall 2111b arranged to intersect each other. The area of ​​the first shell wall 2111a is larger than the area of ​​the second shell wall 2111b. The first shell wall 2111a is arranged toward the end plate 22, and the second shell wall 2111b is arranged toward the buffer member 30. Along the second direction Y, the buffer member 30 has a mating surface 30a arranged toward the battery cell arrangement assembly 21, and the mating surface 30a covers the second shell wall 2111b of each battery cell 211a of the outermost battery group 211. The buffer member 30 also includes a guide surface 30b disposed opposite the mating surface 30a along the second direction Y. The guide surface 30b is inclined. The vertical distance from the end of the guide surface 30b facing the bottom wall 111 to the mating surface 30a is d1, and the vertical distance from the end of the guide surface 30b facing away from the bottom wall 111 to the mating surface 30a is d2, wherein d2>d1. A buffer cavity 30c is provided inside the buffer member 30. The pressure strip 23 abuts against the ends of at least two battery cells 211a facing away from the bottom wall 111. The pressure strip 23 and the buffer member 30 form an integral structure. The pressure strip 23 and the buffer member 30 are respectively bonded and fixed to multiple battery cells 211a distributed along the first direction X. The binding strap 24 is bound and provided on the periphery of the battery cell arrangement assembly 21. The pressure strip 23 is provided with a groove 231, and the binding strap 24 is partially located in the groove 231. The heat exchange element 40 is disposed within the accommodating cavity 113, between the bottom wall 111 and the battery module 20. The metal assembly 12 is disposed outside the accommodating cavity 113 and includes a support member 121 and a mounting member 122. The support member 121 is supported on the side of the bottom wall 111 facing away from the accommodating cavity 113, and the mounting member 122 protrudes from the side of the side wall 112 facing away from the accommodating cavity 113.The non-metallic box body 11 further includes an extension section 114 , one end of which is connected to the side wall 112 and the other end of which extends away from the accommodating cavity 113 . The mounting member 122 and the extension section 114 are at least partially stacked and connected.

[0174] The battery module 20 includes a battery cell arrangement assembly 21, end plates 22, pressure strips 23, and binding strips 24. The battery cell arrangement assembly 21 includes a plurality of battery cells 211a stacked along a first direction X. The battery cell arrangement assembly 21 is provided with end plates 22 at both ends of the battery cell arrangement assembly 21 in the first direction X. The battery cell arrangement assembly 21 is spaced apart from the second wall 1122 in the second direction Y, forming a gap 60. A buffer member 30 is disposed in the gap 60. The buffer member 30 is fixed relative to at least one of the battery cell arrangement assembly 21 and the housing 10. The orthographic projection of the buffer member 30 in the second direction Y covers the plurality of battery cells 211a distributed along the first direction X.

[0175] In a second aspect, the present application provides an electrical device including the above-mentioned battery device 100 .

[0176] 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: The box body includes a bottom wall and side walls, the side walls are arranged around the bottom wall and enclose a receiving cavity, the side walls include a first wall arranged opposite to each other along a first direction and a second wall arranged opposite to each other along a second direction, the first wall and the second wall intersect and are respectively connected to the bottom wall; a battery module disposed in the accommodating cavity, the battery module comprising a battery cell arrangement assembly and an end plate, the battery cell arrangement assembly comprising a plurality of battery cells stacked along the first direction, the end plates being respectively disposed at both ends of the battery cell arrangement assembly in the first direction, and the battery cell arrangement assembly being spaced apart from the second wall in the second direction to form a gap; A buffer is provided in the gap, wherein the relative position of the buffer to at least one of the battery cell arrangement assembly and the box is fixed, and the orthographic projection of the buffer in the second direction covers a plurality of the battery cells distributed along the first direction.

2. The battery device according to claim 1, wherein: Along the second direction, the buffer member has a mating surface disposed toward the battery cell arrangement assembly, and an orthographic projection of the mating surface in the second direction covers a plurality of the battery cells distributed along the first direction.

3. The battery device according to claim 2, characterized in that The buffer also includes a guide surface arranged opposite to the mating surface along the second direction, the guide surface is arranged at an angle, the vertical distance from the end of the guide surface facing the bottom wall to the mating surface is d1, and the vertical distance from the end of the guide surface away from the bottom wall to the mating surface is d2, wherein d2>d1.

4. The battery device according to claim 1, wherein: A buffer cavity is provided inside the buffer component.

5. The battery device according to claim 1, wherein: The buffer component is a solid structure, and the solid structure includes at least one of foam and rubber.

6. The battery device according to claim 1, wherein: The battery module further includes a pressure strip, the pressure strip abuts against one end of at least two of the battery cells away from the bottom wall, and the pressure strip is connected and fixed to the buffer member.

7. The battery device according to claim 6, characterized in that The pressure strip and the buffer member form an integrated structure, and the pressure strip and the buffer member are respectively bonded and fixed to the plurality of battery cells distributed along the first direction.

8. The battery device according to claim 6, characterized in that The battery module further includes a binding strap, which is tied around the periphery of the battery cell arrangement assembly. A groove is provided on the pressure strip, and a portion of the binding strap is located in the groove.

9. The battery device according to claim 1, wherein: The buffer member includes a buffer plate and a plurality of connecting ribs. Each connecting rib is arranged on a side of the buffer plate away from the battery cell arrangement assembly in the second direction. The connecting rib is fixedly connected to the second wall.

10. The battery device according to claim 1, wherein: The box body includes a non-metal box body, and the non-metal box body includes the bottom wall and the side wall.

11. The battery device according to claim 10, characterized in that The battery device further includes a heat exchange component, which is disposed in the accommodating cavity and between the bottom wall and the battery module.

12. The battery device according to claim 10, wherein: The battery device also includes a metal component, which is arranged outside the accommodating cavity. The metal component includes a supporting member and a hanging member. The supporting member is supported on the side of the bottom wall away from the accommodating cavity, and the hanging member is arranged to protrude from the side of the side wall away from the accommodating cavity.

13. The battery device according to claim 12, characterized in that The non-metal box body further includes an extension section, one end of which is connected to the side wall and the other end of which extends in a direction away from the accommodating cavity, and the mounting member and the extension section are at least partially stacked and connected.

14. The battery device according to any one of claims 1 to 13, characterized in that: The battery cell arrangement assembly includes multiple groups of battery packs distributed along the second direction, each group of the battery packs includes multiple battery cells distributed along the first direction, the orthographic projection of the end plate in the first direction covers each of the battery packs, and in the second direction, the buffer members are respectively arranged between the two outermost groups of the battery packs and the corresponding second walls.

15. The battery device according to claim 14, characterized in that The battery cell includes a shell, an electrode assembly and an end cover assembly. The electrode assembly is arranged in the shell, and the end cover assembly is covered at the opening of the shell. The shell includes a first shell wall and a second shell wall arranged to intersect with each other. The area of ​​the first shell wall is larger than the area of ​​the second shell wall. The first shell wall is arranged toward the end plate, and the second shell wall is arranged toward the buffer member. Along the second direction, the buffer member covers the second shell wall of each battery cell of the outermost battery pack.

16. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 15.

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