Battery devices and electrical equipment

Abstract

This application relates to a battery device and an electrical appliance. The battery device includes a housing assembly with a bottom wall; a protective plate assembly located within the housing assembly and disposed on the bottom wall; a battery module disposed within the housing assembly and above the protective plate assembly, the battery module including a busbar and multiple battery cells arranged side-by-side along a first direction, each battery cell including electrode terminals facing the bottom wall, the busbar for electrically connecting the electrode terminals of different battery cells; multiple limiting beams disposed between the battery module and the protective plate assembly, the limiting beams being disposed at the ends of the battery module along a second direction and located outside the electrode terminals, the limiting beams abutting between the battery cells and the protective plate assembly, the second direction being perpendicular to the first direction; and multiple buffers abutting between the busbar and the protective plate assembly, each limiting beam having a buffer on at least one side where the electrode terminals are located along the second direction. This battery device can improve operational reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and electrical equipment. Background Technology

[0002] Due to the advantages of lithium-ion batteries, such as high energy density, high power density, high cycle life, and long storage time, they have been widely used in new energy electric vehicles.

[0003] Currently, some battery devices have their individual cells inverted, meaning the electrode terminals are facing downwards. To protect the electrode terminals, a protective structure is installed at the bottom of the casing to improve the overall bending and shear resistance. However, in actual use, it has been found that the reliability of this type of battery device remains relatively low. Summary of the Invention

[0004] The purpose of this application is to improve the operational reliability of battery devices.

[0005] According to a first aspect of this application, a battery device is provided, comprising:

[0006] Enclosure assembly, including the bottom wall;

[0007] The protective panel assembly is located inside the enclosure component and is installed on the bottom wall;

[0008] The battery module is located inside the housing assembly and above the protective plate assembly. The battery module includes a busbar and multiple battery cells arranged side by side along a first direction. Each battery cell includes an electrode terminal, which is positioned facing the bottom wall. The busbar is used to electrically connect the electrode terminals of different battery cells.

[0009] Multiple limiting beams are disposed between the battery module and the protective plate assembly. The limiting beams are located at the ends of the battery module along the second direction and outside the electrode terminals. The limiting beams abut against the battery cells and the protective plate assembly. The second direction is perpendicular to the first direction.

[0010] Multiple buffers are abutted between the busbar and the protective plate assembly, and each limiting beam has a buffer on at least one side with an electrode terminal along the second direction.

[0011] This embodiment, by installing a protective plate assembly on the bottom wall inside the housing assembly, can first bear the main impact force transmitted from the outside of the housing assembly to the battery cells through the bottom wall. The remaining impact force can be directly transmitted to the buffer, or, after being transmitted to the limiting beam, a portion can be laterally transmitted to the buffer. Therefore, for inverted battery cell arrangements, the buffer simultaneously provides support and cushioning, reducing the impact energy transmitted to the electrode terminals through the busbars, effectively buffering the impact energy transmission path, reducing deformation in the electrode terminal area, preventing failure, effectively protecting the electrode terminals, and ensuring the sealing performance of the electrode terminal area. Thus, it can improve the operational reliability of the battery cells under impact conditions at the bottom.

[0012] Furthermore, both the limiting beam and the buffer component are in contact with the protective plate assembly, with the buffer component located on the side of the limiting beam. Together, they support the battery cells and the busbar. Compared to related technologies where a long arm extends from the side of the limiting beam to support both the battery cells and the busbar, the limiting beam retains only the necessary structural support area, significantly reducing its volume and material usage. The buffer component fills the gap between the limiting beam and the busbar, ensuring both cushioning and support performance while avoiding structural inconsistencies and material waste, thus achieving lightweighting of the battery device and cost savings. Additionally, the shortened arm length of the limiting beam prevents load concentration issues caused by excessively rigid structural enclosure.

[0013] In addition, for different battery devices, limit beams and buffers of different sizes can be set according to their structure, which can improve compatibility with different battery devices.

[0014] In some embodiments, the buffer extends along the second direction beyond the inner edge of the electrode terminal.

[0015] This embodiment ensures that the extension length of the buffer on the side of the limiting beam at least covers the area where the electrode terminal is located, which can effectively protect the electrode terminal, buffer the transmission path of impact energy, reduce the deformation of the electrode terminal area, prevent failure, effectively protect the electrode terminal, and ensure the sealing performance of the electrode terminal area.

[0016] In some embodiments, the limiting beam includes:

[0017] The limiting part abuts against the battery module; and

[0018] A connecting portion is connected to at least one side of the limiting portion along the second direction and extends outward;

[0019] The buffer component has a groove on the surface facing the protective plate assembly, and the connecting part is embedded in the groove.

[0020] This embodiment improves the reliability of the connection between the buffer and the limiting beam by providing a connecting part on the side of the limiting part and a groove at the bottom of the buffer, so that the connecting part is embedded in the groove. It is less likely to misalign or separate when subjected to impact, and the buffer can better absorb vibration, thus improving the protection of the electrode terminals of the battery cell. Moreover, the outwardly extending connecting part can increase the limiting beam's resistance to deformation.

[0021] In some embodiments, the bottom surfaces of the limiting part, the connecting part, and the buffer are flush and all contact the protective plate assembly.

[0022] This embodiment, by providing a groove at the bottom of the buffer and embedding the connecting part into the groove, facilitates the flushing of the bottom surfaces of the limiting part, connecting part, and buffer, forming a unified flat surface at the bottom, which allows for a larger contact area with the protective plate assembly. Thus, the protective plate assembly provides stable support for the integrated assembly formed by the limiting beam and the buffer, preventing the buffer from tilting and causing additional damaging force to the electrode terminals. In this way, the limiting beam reliably fixes the battery module, and the buffer provides stable support for the busbar. Furthermore, under impact conditions, the buffer absorbs impact energy, reducing the impact force applied to the electrode terminals through the busbar, thereby better protecting the electrode terminals.

[0023] In some embodiments, the connection extends along the second direction to no more than the outer edge of the electrode terminal.

[0024] This embodiment limits the maximum extension length of the connecting part so that the connecting part and the electrode terminal do not overlap in the second direction, that is, the connecting part does not reach the position below the electrode terminal. This can appropriately reduce the support stiffness of the electrode terminal area, allowing the buffer to play its full role, thereby absorbing the impact force applied to the electrode terminal and thus better protecting the electrode terminal.

[0025] In some embodiments, the limiting portion has a cavity extending in a first direction.

[0026] This embodiment, by creating a cavity within the limiting portion, allows the hollow limiting portion to absorb external impact energy when it is transmitted to the limiting portion through the protective plate assembly. This prevents the impact energy from being directly transmitted to the bottom of the battery cell, improving the reliability of the battery cell's operation and preventing deformation of the battery cell's casing due to impact, which could then crush the electrode assembly. Furthermore, this structure reduces the weight of the limiting beam, achieving a lighter battery device, and can be easily manufactured through extrusion or other methods.

[0027] In some embodiments, the plurality of limiting beams includes a first limiting beam, and the battery device includes at least two battery modules spaced apart along a second direction, with adjacent battery modules sharing a first limiting beam at positions close to each other.

[0028] For the first limiting beam, the limiting part is provided with connecting parts and buffers on both sides along the second direction.

[0029] This embodiment allows for smaller gaps between adjacent battery modules by sharing a first limiting beam, resulting in a more compact overall layout. Furthermore, connecting parts and buffers are provided on both sides of the limiting beam, providing support and cushioning for the electrode terminals on both sides. Therefore, this battery device allows for flexible adjustment of the buffer's position and thickness based on the location of the limiting beam and the electrode terminals, enabling modular adjustment.

[0030] In some embodiments, the housing assembly includes a plurality of expansion beams extending along a second direction, and the battery module is provided with expansion beams at both ends along a first direction. The two ends of the limiting beam are respectively connected to the expansion beams at both ends of the battery module by fasteners.

[0031] This embodiment uses an expansion beam to define the cavity for accommodating the battery module, and the two ends of the limiting beam can be fastened to the expansion beam with fasteners to provide a stable and reliable limiting and fixing effect on the inverted battery module, thereby improving the working reliability of the battery device when subjected to vibration and impact.

[0032] In some embodiments, the buffer is provided with a plurality of through holes spaced apart along a first direction, and the through holes are positioned directly opposite the electrode terminals.

[0033] This embodiment, while absorbing the impact force transmitted from the protective plate assembly through the buffer, takes into account that the electrode terminals protrude from the bottom surface of the outer casing, are subjected to greater forces, and deform significantly under vibration and impact, requiring a larger buffering force. Therefore, by providing through holes in the buffer directly opposite the electrode terminals, the energy absorption efficiency of the buffer in the area where the electrode terminals are located can be further improved, thereby reducing direct impact on the electrode terminals and improving the operational reliability of the battery device. Moreover, this structure allows the top surface of the buffer to better contact the busbar and the bottom surface to better contact the protective plate assembly, improving the stability of the connection support.

[0034] In some embodiments, the cushioning element is made of foam.

[0035] In this embodiment, a buffer element made of foam material is installed between the limiting beam and the busbar. The high rigidity of the foam provides excellent support. Furthermore, with the electrode terminals facing downwards directly towards the external impact source, a flexible energy-absorbing zone is formed between the foam layer and the protective plate assembly. This flexibly reduces the energy dissipation path, significantly decreasing stress concentration caused by bottom impacts and preventing plastic deformation or seal failure of the electrode terminals. Under impact loads, the buffer element undergoes microscopic compressive deformation, reducing the peak value of the shock wave, delaying load transmission, and dispersing impact energy, thus providing excellent protection for the electrode terminals.

[0036] In some embodiments, the battery cell includes a pressure relief component and two electrode terminals spaced apart along a second direction, with the pressure relief component disposed between the two electrode terminals;

[0037] The manifold extends along the second direction to the edge of the pressure relief component, and the buffer extends along the second direction to be flush with the manifold.

[0038] This embodiment extends the busbar along the second direction to a point not exceeding the edge of the pressure relief component. This allows adjacent busbars in the same battery module along the second direction to form an exhaust channel with a width not less than the width of the pressure relief component, facilitating the smooth discharge of high-temperature gases in the event of thermal runaway. Furthermore, the buffer extends flush with the busbar, without affecting the width of the exhaust channel. When the bottom is subjected to impact, the busbar is less prone to deformation affecting the reliability of the electrical connection because its bottom and edges are supported by the buffer. A cantilever design for the busbar would be more susceptible to bending deformation. Furthermore, it prevents the busbar from transmitting impact force to the pressure relief component through the electrode terminals, thus avoiding damage to the pressure relief component and improving its structural reliability. Therefore, while ensuring enhanced bottom support strength to protect the electrode terminals and explosion-proof area, it meets the exhaust requirements during thermal runaway and reduces the possibility of accidents during operation.

[0039] In some embodiments, the protective panel assembly includes:

[0040] The bottom guard plate, made of metal, is used to withstand the main impact forces transmitted from the bottom wall; and

[0041] A coating is applied between the bottom guard plate and the bottom wall to protect the bottom guard plate.

[0042] In this embodiment, the protective plate assembly has a coating at the point where it contacts the bottom wall, which improves the durability of the battery device in humid, corrosive, or gravel impact environments. A bottom protective plate is located on the side of the coating away from the bottom wall, serving as the primary impact-bearing layer structure, which can initially resist most of the impact force through its greater strength. This prevents larger impact forces from acting on the electrode terminals.

[0043] In some embodiments, the protective panel assembly further includes:

[0044] A honeycomb panel, located on the side of the bottom protector away from the coating, is used to disperse the impact force transmitted by the bottom protector; and / or

[0045] A composite material sheet, disposed on the side of the base plate away from the coating, comprising interlaced transverse and longitudinal fibers; and / or

[0046] The mica sheet is located on the side of the bottom protective plate away from the coating and is attached to the limiting beam and buffer. The mica sheet is used for heat insulation and electrical insulation.

[0047] The protective plate assembly in this embodiment uses a honeycomb plate, which is a hollow sandwich structure with high specific strength and good cushioning performance. The impact force can be blocked by the bottom protective plate and further dispersed by the honeycomb plate. The composite material plate provides lateral stiffness and overall stability, minimizing deformation in the third direction. The mica plate is mainly used for heat insulation, electrical insulation and fireproofing. It acts as a thermal barrier to isolate the heat source from the battery cells, prevent the high temperature of the battery cells from being transferred outward, prevent the spread of thermal runaway heat that could cause the entire battery device to catch fire and explode, and improve the system safety level.

[0048] According to a second aspect of this application, an electrical device is provided, including the battery device of the above embodiments. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the structure of some embodiments of the electrical equipment used in this application.

[0051] Figure 2 This is an exploded view of some embodiments of the battery device of this application.

[0052] Figure 3 This is a schematic diagram of the structure of the limiting beam connected to the expansion beam inside the housing assembly in the battery device of this application.

[0053] Figure 4 This is a schematic diagram of the structure of some embodiments of the battery device of this application in which the bottom protective plate is installed inside the casing.

[0054] Figure 5 Schematic diagrams of some embodiments for installing buffer components on limit beams.

[0055] Figure 6 This is a schematic diagram of the protective structure installed at the bottom of a single battery cell in the battery device of this application.

[0056] Figure 7 This is a schematic diagram of the structure for installing a buffer component on the right side of the limiting beam.

[0057] Figure 8 This is a schematic diagram of the structure for installing a buffer component on the left side of the limiting beam.

[0058] Figure 9 This is a structural schematic diagram of some embodiments of a honeycomb panel.

[0059] The accompanying drawings are not drawn to scale.

[0060] Marker explanation:

[0061] 1. Box assembly; 10. Bottom wall; 11. Box body; 12. Cover; 13. Expansion beam;

[0062] 2. Battery module; 20. Battery cell; 21. Housing; 22. Electrode terminals; 23. Pressure relief components;

[0063] 3. Limiting beam; 31. Limiting part; 32. Connecting part; 33. Recessed part; 34. Mounting hole; 35. Extension part; 3A. First limiting beam; 3B. Second limiting beam;

[0064] 4. Buffer component; 41. Through hole; 42. Groove;

[0065] 5. Protective panel assembly; 51. Coating; 52. Bottom protective plate; 53. Honeycomb panel; 54. Composite material panel; 55. Mica panel;

[0066] 6. Fasteners;

[0067] 7. Busbar;

[0068] 8. Exhaust passage;

[0069] 100. Battery device;

[0070] 200. Vehicle; 201. Cabin; 202. Floor;

[0071] x, first direction; z, second direction; y, third direction. Detailed Implementation

[0072] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0073] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0074] This application uses terms such as "upper," "lower," "top," "bottom," "front," "back," "inner," and "outer" to indicate orientation or positional relationships. This is only for the convenience of describing this application and is not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this application.

[0075] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" does not mean strictly vertical, but rather within the permissible range of error. "Parallel" does not mean strictly parallel, but rather within the permissible range of error. The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application.

[0076] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0077] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least some of the embodiments of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0078] Battery cells can include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to these. Battery cells can be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to these. Current battery cells typically include a casing and electrode components housed within the casing, and the casing is filled with electrolyte.

[0079] Current battery cells typically include a casing and an electrode assembly housed within the casing, with an electrolyte filled inside. The electrode assembly is mainly formed by stacking or winding a first electrode and a second electrode with opposite polarities, and a separator is usually provided between the first and second electrodes. The coated portions of the first and second electrodes constitute the main body of the electrode assembly, while the uncoated portions of the first and second electrodes each constitute a first tab and a second tab. In lithium-ion batteries, the first electrode can be a positive electrode, including a positive current collector and a positive electrode coating layer disposed on both sides of the positive current collector. The material of the positive current collector can be, for example, aluminum, and the positive electrode coating can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The second electrode can be a negative electrode, including a negative current collector and a negative electrode coating layer disposed on both sides of the negative current collector. The material of the negative current collector can be, for example, copper, and the negative electrode coating layer can be, for example, graphite or silicon. The first tab and the second tab can be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of a single battery cell, the positive electrode coating and the negative electrode coating react with the electrolyte, and the tabs connect to the electrode leads to form a current loop.

[0080] Currently, some battery devices have their individual cells inverted, meaning the electrode terminals are facing downwards. To protect the electrode terminals, a protective structure is installed at the bottom of the casing to improve the overall bending and shear resistance. However, in actual use, it has been found that the reliability of this type of battery device remains relatively low.

[0081] The reason for this is that protective structures generally use high-rigidity, high-thickness metal materials (such as steel plates or aluminum alloy plates) to improve the overall bending and shear resistance of the structure. However, when the battery device is subjected to bottom impact loads, the "excessively rigid coupling" support structure will directly transmit the impact force to the electrode terminals (such as terminals), causing mechanical damage to the electrode terminals and failure of the sealing structure at the connection between the electrode terminals and the casing. This can lead to problems such as internal short circuits and thermal runaway, reducing the reliability of the battery device.

[0082] Therefore, in order to improve the reliability of the battery device, this application proposes an improved battery device.

[0083] The battery device described in this application is applicable to various electrical devices. These devices can be mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc.

[0084] like Figure 1As shown, the electrical equipment can be a vehicle 200, such as a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle; or the electrical equipment can be a drone or a ship. The vehicle 200 may include a cabin 201 and a vehicle floor 202, with the battery device 100 located between the cabin 201 and the vehicle floor 202. The battery device 100 can be located at the bottom, front, or rear of the vehicle 200, and is used to provide electrical power for the motor and other components in the vehicle.

[0085] This application provides a battery device 100, such as Figure 2 As shown, it includes:

[0086] Box assembly 1 includes bottom wall 10;

[0087] Protective panel assembly 5 is located inside housing assembly 1 and is installed on bottom wall 10;

[0088] Battery module 2 is located inside housing assembly 1 and above protective plate assembly 5. Battery module 2 includes busbar 7 and multiple battery cells 20 arranged side by side along the first direction x. Each battery cell 20 includes an electrode terminal 22, which is disposed toward the bottom wall 10. Busbar 7 is used to electrically connect the electrode terminals 22 of different battery cells 20.

[0089] Multiple limiting beams 3 are disposed between the battery module 2 and the protective plate assembly 5. The limiting beams 3 are located at the ends of the battery module 2 along the second direction y and outside the electrode terminals 22. The limiting beams 3 abut against the battery cell 20 and the protective plate assembly 5. The second direction y is perpendicular to the first direction x.

[0090] Multiple buffers 4 are abutted between the busbar 7 and the protective plate group 5, and each limiting beam 3 has a buffer 4 on at least one side where an electrode terminal 22 is provided along the second direction y.

[0091] The housing assembly 1 may include a housing 11 and a cover 12. The housing 11 has an interior cavity for accommodating individual battery cells 20. Depending on the shape, number, arrangement, and other requirements of the battery cells 20, the housing 11 may have different shapes and sizes; for example, the housing 11 may be rectangular. The cover 12 is used to close the opening of the housing 11. To facilitate maintenance of the battery device 100, the housing assembly 1 is detachably installed on the electrical equipment. In the installed state of the battery device 100, the bottom wall 10 of the housing 11 is located at the bottom.

[0092] The protective plate assembly 5 is located inside the housing assembly 1 and disposed on the bottom wall 10, serving to provide overall protection for all battery cells 20 and reduce the impact force transmitted from outside the housing assembly 1 through the bottom wall 10 to the battery cells 20. The protective plate assembly 5 may include a single layer structure, or multiple identical layer structures stacked along a third direction z (the thickness direction of the battery device 100) to enhance a single protective function, or multiple different layer structures stacked along the third direction z to achieve multiple different protective functions. The third direction z is perpendicular to the first direction x and the second direction y.

[0093] Battery module 2 is housed within housing assembly 1 and located above protective plate assembly 5. One or more battery modules 2 can be installed, and when multiple battery modules 2 are installed, they can be spaced apart along the second direction y. Each battery module 2 includes a busbar 7 and multiple battery cells 20 arranged side-by-side along the first direction x. The busbar 7 is used to electrically connect the electrode terminals 22 of different battery cells 20 to achieve series, parallel, or mixed connections of multiple battery cells 20 within the battery module 2. The busbar 7, also known as a battery plate, is made of metal. The battery cells 20 are placed vertically, meaning the thickness direction of the battery cell 20 is aligned with the first direction x.

[0094] like Figure 6 As shown, the battery cell 20 includes a housing 21, an electrode assembly is disposed inside the housing 21, and an electrode terminal 22 is provided at the bottom of the housing 21, with the electrode terminal 22 facing the bottom wall 10. For example, the housing 21 includes a shell and an end cap, the end cap covering the opening of the shell, and the electrode terminal 22 is disposed on the end cap. For example, one electrode terminal 22 may be provided at the bottom of the housing 21, or two may be provided at intervals along the second direction y, or multiple electrode terminals may be provided, and the battery cell 20 may be cuboid in shape.

[0095] For example, electrode terminal 22 can be a pole or the like. Electrode terminal 22 protrudes from the bottom surface of housing 21.

[0096] Multiple limiting beams 3 are spaced apart along the second direction y, and the limiting beams 3 extend along the first direction x. The limiting beams 3 are positioned between the battery module 2 and the protective plate assembly 5 along the third direction z. The limiting beams 3 are located at the ends of the battery module 2 along the second direction y and are located outside the electrode terminals 22, used to press the shoulder of the battery module 2. The limiting beams 3 abut against the battery cell 20 and the protective plate assembly 5. The limiting beams 3 can be pressure strips, etc.

[0097] The buffer 4 abuts against the busbar 7 and the protective plate assembly 5 in the third direction z. Each limiting beam 3 has a buffer 4 on at least one side where an electrode terminal 22 is provided along the second direction y, or a buffer 4 is also provided on the side of the limiting beam 3 where no electrode terminal 22 is provided along the second direction y. The buffer 4 is made of energy-absorbing material and can absorb energy through compression deformation. It is deformable at least in the third direction z.

[0098] The battery cell 20 can be, for example, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, or a magnesium-ion battery.

[0099] This embodiment, by installing a protective plate assembly 5 on the bottom wall 10 inside the housing assembly 1, can first bear the main impact force transmitted from the outside of the housing assembly 1 through the bottom wall 10 to the battery cell 20. The remaining impact force can be directly transmitted to the buffer 4, or after being transmitted to the limiting beam 3, a portion can also be transmitted laterally to the buffer 4. Thus, for the inverted battery cell 20 arrangement, the buffer 4 simultaneously serves as support and buffer, reducing the impact energy transmitted to the electrode terminal 22 through the busbar 7, effectively buffering the impact energy transmission path, reducing the deformation of the electrode terminal 22 area, preventing failure, effectively protecting the electrode terminal 22, and ensuring the sealing performance of the electrode terminal 22 area. Therefore, it can improve the operational reliability of the battery cell 20 when subjected to impact at the bottom.

[0100] Furthermore, both the limiting beam 3 and the buffer 4 are in contact with the protective plate assembly 5, and the buffer 4 is located on the side of the limiting beam 3. Together, they support the battery cell 20 and the busbar 7. Compared with the related technology where a long arm extends from the side of the limiting beam 3 to support both the battery cell 20 and the busbar 7, the limiting beam 3 retains only the necessary structural support area, significantly reducing its volume and material usage. The buffer 4 fills the space between the limiting beam 3 and the busbar 7, ensuring both buffering and support performance while avoiding structural inconsistencies and material waste, thus achieving a lightweight battery device 100 and saving costs. In addition, the shortened arm length of the limiting beam 3 prevents load concentration caused by excessive rigid structural coverage.

[0101] Furthermore, for different battery devices 100, limit beams 3 and buffers 4 of different sizes can be set according to their structures, which can improve compatibility with different battery devices 100.

[0102] In some embodiments, such as Figure 6 As shown, the buffer 4 extends along the second direction y to beyond the inner edge of the electrode terminal 22.

[0103] For example, the battery cell 20 is cuboid, with two electrode terminals 22 spaced apart at its bottom along the second direction y, and the buffer 4 extends along the second direction y beyond the inner edge of the electrode terminal 22 near the buffer 4.

[0104] This embodiment ensures that the extension length of the buffer 4 on the side of the limiting beam 3 at least covers the area where the electrode terminal 22 is located, which can effectively protect the electrode terminal 22, buffer the transmission path of impact energy, reduce the deformation of the area of ​​the electrode terminal 22, prevent failure, effectively protect the electrode terminal 22, and ensure the sealing performance of the area of ​​the electrode terminal 22.

[0105] In some embodiments, such as Figure 6 , Figure 7 and Figure 8 As shown, the limiting beam 3 includes:

[0106] Limiting part 31 abuts against battery module 2; and

[0107] The connecting portion 32 is connected to at least one side of the limiting portion 31 along the second direction y and extends outward;

[0108] The buffer 4 has a groove 42 on the surface facing the protective plate assembly 5, and the connecting part 32 is embedded in the groove 42.

[0109] For example, the limiting portion 31 extends along the first direction x and can cover the entire length of a single battery module 2 along the first direction x. The limiting portion 31 can be rectangular in structure, and at least part of the width of its top surface along the second direction y is used to support the bottom surface of the battery cell 20.

[0110] The connecting portion 32 may extend outward from one side of the limiting portion 31 or from both sides of the limiting portion 31. For example, the bottom of the limiting portion 31 may be provided with an integral flat plate structure, which covers the bottom surface of the limiting portion 31 and extends toward the side to form the connecting portion 32; or the connecting portion 32 may extend outward directly from the bottom area of ​​the side wall of the limiting portion 31.

[0111] The bottom surface of the buffer 4 has a groove 42 on the side near the connecting part 32, and the outwardly extending connecting part 32 is embedded in the groove 42. The buffer 4 and the connecting part 32 can be connected by adhesive, for example, by structural adhesive. The bonding strength can be selected between 0.5MPa and 500MPa according to the actual working conditions (such as whether disassembly is required, the rigidity of the enclosure, etc.).

[0112] This embodiment improves the reliability of the connection between the buffer member 4 and the limiting beam 3 by providing a connecting part 32 on the side of the limiting part 31 and a groove 42 at the bottom of the buffer member 4, so that the connecting part 32 is embedded in the groove 42. This makes it less likely to misalign or separate when subjected to impact, and the buffer member 4 can better absorb vibration, thus improving the protection of the electrode terminals 22 of the battery cell 20. Moreover, the outwardly extending connecting part 32 can increase the limiting beam 3's ability to resist deformation.

[0113] In some embodiments, such as Figure 6As shown, the bottom surfaces of the limiting part 31, the connecting part 32, and the buffer part 4 are flush and all in contact with the protective plate assembly 5.

[0114] In this structure, the connecting part 32 extends outward directly from the bottom region of the side wall of the limiting part 31.

[0115] This embodiment, by providing a groove 42 at the bottom of the buffer member 4 and embedding the connecting part 32 into the groove 42, facilitates the flushing of the bottom surfaces of the limiting part 31, the connecting part 32, and the buffer member 4, forming a unified flat surface at the bottom, which can create a larger contact area with the protective plate assembly 5. Thus, the protective plate assembly 5 can provide stable support for the integrated assembly formed by the limiting beam 3 and the buffer member 4, preventing the buffer member 4 from tilting and causing additional damaging force to the electrode terminal 22. In this way, the limiting beam 3 can reliably fix the battery module 2, and the buffer member 4 can stably support the busbar 7. Furthermore, under impact conditions, the buffer member 4 can absorb impact energy, reducing the impact force applied to the electrode terminal 22 through the busbar 7, thereby better protecting the electrode terminal 22.

[0116] In some embodiments, the connection portion 32 extends along the second direction y to no more than the outer edge of the electrode terminal 22.

[0117] like Figure 6 As shown, the connecting portion 32 extends along the second direction y to just reach the outer edge of the electrode terminal 22.

[0118] This embodiment limits the maximum extension length of the connecting part 32 so that the connecting part 32 and the electrode terminal 22 do not overlap in the second direction y, that is, the connecting part 32 does not reach the position below the electrode terminal 22. This can appropriately reduce the support stiffness of the area of ​​the electrode terminal 22, so that the buffer 4 can play a full role in absorbing the impact force applied to the electrode terminal 22, thereby better protecting the electrode terminal 22.

[0119] In some embodiments, the limiting portion 31 has a cavity extending along the first direction x.

[0120] The cavity has openings at both ends along the first direction x, and the limiting beam 3 of this structure can be integrally extruded. For example, the cross-section of the limiting part 31 is rectangular.

[0121] Optionally, a crossbeam is provided within the limiting part 31, with its two sides along the second direction y connected to two opposite sidewalls of the limiting part 31 along the second direction y. This structure can also resist the effect of deformation in the third direction z, and compared with the structure of providing a longitudinal beam within the limiting part 31, the crossbeam can prevent the impact force from being directly transmitted to the battery cell 20.

[0122] This type of limiting part 31 with a cavity, or a limiting part 31 with a crossbeam inside, can be connected to a flat plate structure on its bottom surface to form a limiting beam 3, which is suitable for situations with high requirements for assembly and structural rigidity; or, the limiting beam 3 can be integrally molded, which can simplify the number of parts and improve assembly efficiency and product consistency while meeting rigidity requirements.

[0123] This embodiment, by providing a cavity within the limiting portion 31, allows the hollow limiting portion 31 to absorb impact energy when external impact force is transmitted to it through the protective plate assembly 5. This prevents the impact energy from being directly transmitted to the bottom of the battery cell 20 via the limiting portion 31, thereby improving the reliability of the battery cell 20 and preventing deformation of the outer shell 21 of the battery cell 20 due to impact, which could then crush the electrode assembly. Furthermore, this structure reduces the weight of the limiting beam 3, achieving a lighter battery device 100, and it can be molded by extrusion or other methods, making it easy to manufacture.

[0124] In some embodiments, such as Figure 5 and Figure 6 As shown, the plurality of limiting beams 3 include a first limiting beam 3A, and the battery device 100 includes at least two battery modules 2 arranged at intervals along the second direction y. Adjacent battery modules 2 share a first limiting beam 3A at positions close to each other.

[0125] For the first limiting beam 3A, the limiting part 31 is provided with a connecting part 32 and a buffer part 4 on both sides along the second direction y.

[0126] In the first limiting beam 3A, the top surface of the limiting part 31 abuts against the ends of two adjacent battery modules 2 along the second direction y. The limiting part 31 has connecting parts 32 on both sides along the second direction y, and each connecting part 32 is connected to a buffer member 4. One side wall of the buffer member 4 along the second direction y contacts the side wall of the limiting part 31. The first limiting beam 3A and the buffer members 4 on both sides can be bonded together to form an integral assembly.

[0127] Furthermore, the plurality of limiting beams 3 may also include a second limiting beam 3B, which is located outside the outermost battery module 2. In one structure, such as Figure 6 As shown, the limiting part 31 of the second limiting beam 3B is provided with connecting parts 32 on both sides, and the connecting parts 32 on both sides are provided with buffers 4, which can play a better role in buffering impact forces. In another structure, such as Figure 5 As shown, the limiting part 31 of the second limiting beam 3B is provided with a connecting part 32 and a buffer 4 only on the inner side. This structure does not affect the protection of the electrode terminal 22 and can also reduce the space occupied in the second direction y.

[0128] This embodiment allows for a smaller gap between adjacent battery modules 2 by sharing the first limiting beam 3A, resulting in a more compact overall layout. Furthermore, both sides of the limiting portion 31 are equipped with connecting portions 32 and buffer members 4, providing support and cushioning for the electrode terminals 22 on both sides. Therefore, this battery device 100 allows for flexible adjustment of the position and thickness of the buffer members 4 according to the position of the limiting beam 3 and the electrode terminals 22, enabling modular adjustment.

[0129] In some embodiments, the housing assembly 1 includes a plurality of expansion beams 13 extending along a second direction y, and the battery module 2 is provided with expansion beams 13 at both ends along a first direction x. The two ends of the limiting beam 3 are respectively connected to the expansion beams 13 at both ends of the battery module 2 by fasteners 6.

[0130] For example, if only one set of battery modules 2 is provided inside the housing assembly 1 along the first direction x, then an expansion beam 13 is respectively provided at both ends of the housing assembly 1 along the first direction x, and the area for placing the battery modules 2 is defined between the two expansion beams 13. Alternatively, if at least two sets of battery modules 2 are provided inside the housing assembly 1 along the first direction x, each battery module 2 is provided with an expansion beam 13 at both ends of the first direction x, and each battery module 2 can be provided with a limiting beam 3 at both ends of the second direction y, with each limiting beam 3 fixed to the two expansion beams 13 at both ends.

[0131] For example, fastener 6 can be a screw, bolt, or rivet.

[0132] like Figure 3 As shown, the limiting part 31 has recesses 33 at both ends of its extending direction on the wall surface facing the bottom wall 10, so that the head of the fastener 6 is completely located in the recesses 33, thereby allowing the bottom surface of the limiting beam 3 to contact the protective plate assembly 5.

[0133] like Figure 7 The diagram shown is a schematic of the buffer 4 connected to the right side of the limiting beam 3; as shown... Figure 8 The diagram shows the buffer 4 connected to the left side of the limiting beam 3. The limiting part 31 has extensions 35 at both ends along the first direction x in the bottom region. The extensions 35 have mounting holes 34. The fasteners 6 pass through the extensions 35 and the expansion beams 13 in sequence to fix the two ends of the limiting beam 3 to the two expansion beams 13 respectively.

[0134] This embodiment, by setting an expansion beam 13, can both define the cavity for accommodating the battery module 2 and lock the two ends of the limiting beam 3 to the expansion beam 13 with fasteners 6, so as to provide a stable and reliable limiting and fixing effect on the inverted battery module 2, thereby improving the working reliability of the battery device 100 when subjected to vibration and impact.

[0135] In some embodiments, such as Figure 5 , Figure 7 and Figure 8 The buffer 4 is provided with a plurality of through holes 41 at intervals along the first direction x, and the through holes 41 are positioned directly opposite the electrode terminal 22.

[0136] For example, the through hole 41 can be a round hole, an elliptical hole, a square hole, an hourglass-shaped hole, or an irregular hole, etc. It can be designed according to the actual arrangement and stress characteristics of the electrode terminal 22, and can further optimize the local stress distribution and buffer deformation capacity.

[0137] In this embodiment, based on the absorption of the impact force transmitted from the protective plate assembly 5 by the buffer 4, and considering that the electrode terminal 22 protrudes from the bottom surface of the outer shell 21 and is subjected to greater force, resulting in greater deformation under vibration and impact, and requiring greater buffering force, a through hole 41 is provided in the buffer 4 directly opposite the electrode terminal 22. This further improves the energy absorption efficiency of the buffer 4 in the area where the electrode terminal 22 is located, thereby reducing direct impact on the electrode terminal 22 and improving the operational reliability of the battery device 100. Moreover, this structure allows the top surface of the buffer 4 to better contact the busbar 7 and the bottom surface to better contact the protective plate assembly 5, improving the stability of the connection support.

[0138] In some embodiments, the cushioning element 4 is made of foam.

[0139] For example, buffer 4 is made of rigid foam material. Rigid foam is a type of foam material with a porous structure, high rigidity, and low compression deformation, such as MPP, RPU, and PEEK. Microcellular polypropylene foam (MPP), rigid polyurethane foam (RPU), or polyether ether ketone foam (PEEK) are also examples.

[0140] In this embodiment, a buffer element 4 made of foam material is provided between the limiting beam 3 and the busbar 7. The foam, due to its high rigidity, provides excellent support. Furthermore, since the electrode terminal 22 faces downwards directly towards the external impact source, a flexible energy-absorbing zone is formed between the foam layer and the protective plate assembly 5. This achieves a flexible energy dissipation path, significantly reducing stress concentration caused by bottom impacts and preventing plastic deformation or sealing failure of the electrode terminal 22. Under impact loads, the buffer element 4 undergoes microscopic compressive deformation, reducing the peak value of the shock wave, delaying load transmission, and dispersing impact energy, thus providing excellent protection for the electrode terminal 22.

[0141] In some embodiments, such as Figure 6As shown, the battery cell 20 includes a pressure relief component 23 and two electrode terminals 22 spaced apart along the second direction y, with the pressure relief component 23 disposed between the two electrode terminals 22;

[0142] The manifold 7 extends along the second direction y to the edge of the pressure relief component 23, and the buffer 4 extends along the second direction y to be flush with the manifold 7.

[0143] Specifically, the pressure relief component 23 refers to an element or component that is actuated to release internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. This threshold design varies depending on design requirements. The threshold may depend on one or more materials of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 20. The pressure relief component can take the form of an explosion-proof valve, gas valve, pressure relief valve, or safety valve, and can specifically employ pressure-sensitive or temperature-sensitive elements or structures. That is, when the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief component 23 actuates, or a weak structure within the pressure relief component is damaged, thereby forming an opening or channel for the release of internal pressure or temperature.

[0144] In this application, "actuation" refers to the activation of the pressure relief component 23 to a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The action of the pressure relief component 23 may include, but is not limited to, at least a portion of the pressure relief component rupturing, breaking, tearing, or opening. When the pressure relief component is activated, internal waste from the battery cell 20 is discharged from the activated portion. This method allows for pressure and temperature relief of the battery cell 20 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0145] The emissions from the battery cell 20 mentioned here include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases (such as CH4, CO and other combustible gases) generated by the reaction, flames, etc.

[0146] For example, the busbar 7 extends along the second direction y beyond the inner edge of the electrode terminal 22, but not beyond the edge of the pressure relief member 23; that is, one side of the busbar 7 along the second direction y is located between the pressure relief member 23 and the electrode terminal 22. The buffer member 4 extends along the second direction y to be flush with the busbar 7. Optionally, the buffer member 4 may also extend along the second direction y beyond or retracted from the edge of the busbar 7 by a predetermined distance.

[0147] This embodiment extends the manifold 7 along the second direction y to a point not exceeding the edge of the pressure relief component 23. This allows adjacent manifolds 7 in the same battery module 2 along the second direction y to form an exhaust channel 8 with a width not less than the width of the pressure relief component 23. In the event of thermal runaway, this facilitates the smooth discharge of high-temperature gases. Furthermore, the buffer 4 extends flush with the manifold 7, without affecting the width of the exhaust channel 8. When the bottom is subjected to impact, the bottom and edge of the manifold 7 are supported by the buffer 4, preventing deformation that could affect the reliability of the electrical connection. A cantilever design for the manifold 7 would easily lead to bending deformation. Furthermore, it prevents the manifold 7 from transmitting impact force to the pressure relief component 23 through the electrode terminal 22, thus avoiding damage to the pressure relief component 23 and improving its structural reliability. Therefore, while ensuring enhanced bottom support strength and protection for the electrode terminal 22 and explosion-proof area, it meets the exhaust requirements during thermal runaway and reduces the possibility of accidents during operation.

[0148] In some embodiments, such as Figure 6 As shown, the protective panel assembly 5 includes:

[0149] Bottom plate 52, made of metal, is used to withstand the main impact forces transmitted from bottom wall 10; and

[0150] Coating 51 is disposed between the bottom protective plate 52 and the bottom wall 10 to protect the bottom protective plate 52.

[0151] The coating 51 is the bottom protective layer, mainly used to improve the durability of the battery device 100 in humid, corrosive, or gravel impact environments; for example, it can be made of polyurea or epoxy coating. The bottom protective plate 52 is the lowest layer of the load-bearing structure and can be made of high-strength aluminum alloy or duplex steel to ensure sufficient resistance to impacts from foreign objects on the ground. Figure 4 As shown, the bottom protective plate 52 and the coating 51 are fixed to the bottom wall 10 by fasteners.

[0152] In this embodiment, the protective plate assembly 5 has a coating 51 at the point where it contacts the bottom wall 10, which improves the durability of the battery device 100 in humid, corrosive, or gravel impact environments. A bottom protective plate 52 is provided on the side of the coating 51 away from the bottom wall 10. As the main impact-bearing layer structure, it can resist most of the impact force with greater strength, thus preventing larger impact forces from acting on the electrode terminals 22.

[0153] In some embodiments, such as Figure 6 As shown, the protective panel assembly 5 also includes:

[0154] A honeycomb panel 53, disposed on the side of the bottom protective plate 52 away from the coating 51, is used to disperse the impact force transmitted by the bottom protective plate 52; and / or

[0155] Composite material plate 54, disposed on the side of bottom protective plate 52 away from coating 51, comprises interlaced transverse and longitudinal fibers; and / or

[0156] Mica plate 55 is located on the side of the bottom protective plate 52 away from the coating 51 and is attached to the limiting beam 3 and the buffer member 4. Mica plate 55 is used for heat insulation and insulation.

[0157] Among them, such as Figure 9 As shown, the honeycomb panel 53 can be made of aluminum and has a hollow sandwich structure, which has high specific strength and good buffering performance, effectively dispersing the bottom load.

[0158] Composite plate 54 provides lateral stiffness and overall stability. The material can be glass fiber or carbon fiber reinforced thermosetting resin. Composite materials consist of a matrix and fibers, and their lateral stiffness is the result of the constraint effects of the fibers and matrix, as well as the interfacial bonding between them. Composite materials tend to have high specific strength and high specific stiffness in the selection of matrix and fiber reinforcement materials. Their anisotropic properties are mainly controlled by the ply angle, ply sequence, and ply ratio.

[0159] The mica plate 55 is mainly used for heat insulation, electrical insulation and fire and explosion protection. As a thermal barrier, it isolates the heat source from the battery cell 20, blocks the high temperature of the battery cell 20 from being transferred outward, prevents the spread of thermal runaway heat that could cause the entire battery device 100 to catch fire and explode, and improves the system safety level.

[0160] Specifically, the protective panel assembly 5, starting from the side closest to the bottom wall 10, includes, in sequence: a coating 51, a bottom protective plate 52, a honeycomb plate 53, a composite material plate 54, and a mica plate 55. Adjacent layers can be fixed together by adhesive or other means. During the assembly of the battery device 100, they can be fixed sequentially, or the protective panel assembly 5 can be pre-formed and then installed as a whole into the housing assembly 1.

[0161] In this embodiment, the protective plate assembly 5 is equipped with a honeycomb plate 53, which has a hollow sandwich structure, high specific strength and good buffering performance. The impact force can be blocked by the bottom protective plate 52 and further dispersed by the honeycomb plate 53. The composite material plate 54 provides lateral stiffness and overall stability, minimizing deformation in the third direction z. The mica plate 55 is mainly used for heat insulation, insulation and fireproofing and explosion protection. It acts as a thermal barrier to isolate the heat source from the battery cell 20, prevent the high temperature of the battery cell 20 from being transferred outward, prevent the spread of thermal runaway heat that could cause the entire battery device 100 to catch fire and explode, and improve the system safety level.

[0162] The following is combined with Figures 2 to 9 A specific embodiment of the battery device 100 of this application is given.

[0163] like Figure 2As shown, the housing assembly 1 includes a housing 11 and a cover 12. The housing 11 has an internal cavity. The protective plate assembly 5 is located inside the housing assembly 1 and is disposed on the bottom wall 10. It is used to provide overall protection for all battery cells 20 and reduce the impact force transmitted from the outside of the housing assembly 1 to the battery cells 20 through the bottom wall 10. The protective plate assembly 5 has a multi-layer structure, from bottom to top: coating 51, bottom protective plate 52, honeycomb plate 53, composite material plate 54, and mica plate 55.

[0164] Battery modules 2 are housed within housing assembly 1 and located above protective plate assembly 5. Multiple battery modules 2 are arranged at intervals along the second direction y. Each battery module 2 includes a busbar 7 and multiple battery cells 20 arranged side by side along the first direction x. The busbar 7 is used to electrically connect the electrode terminals 22 of different battery cells 20.

[0165] Adjacent battery modules 2 share a first limiting beam 3A at close proximity. For the first limiting beam 3A, the limiting portion 31 has connecting portions 32 and buffer members 4 on both sides along the second direction y. The first limiting beam 3A and the buffer members 4 on both sides can be bonded together to form an integral assembly. The bottom surfaces of the buffer members 4 and the limiting beam 3A are flush and contact the top surface of the protective plate assembly 5. The buffer member 4 abuts against the busbar 7 and the buffer member 4 in the third direction z. The same battery module 2 forms venting channels 8 between the two buffer members 4 and the two busbars 7. For example, the buffer member 4 can be rigid foam. Multiple through holes 41 are spaced apart along the first direction x on the buffer member 4, and the through holes 41 are directly opposite the electrode terminals 22.

[0166] The battery device 100 of this embodiment has at least one of the following advantages:

[0167] 1. When the buffer 4 is subjected to bottom impact, it undergoes compression deformation, which significantly absorbs and buffers instantaneous energy, effectively reducing the path and intensity of the impact load directly transmitted to the electrode terminal 22, preventing problems such as deformation, cracking, and sealing failure of the electrode terminal 22, and improving the system's impact resistance.

[0168] 2. The length of the connecting parts 32 on both sides of the limiting beam 3 is reduced, which can prevent rigid coupling with the electrode terminal 22, so that the impact energy is first dissipated through the buffer 4 and then transmitted to the battery cell 20, forming a "flexible transition layer" to achieve multi-level buffering.

[0169] 3. The buffer component 4 is provided with through holes 41. The hollow design provides space for the deformation of the buffer component 4, while reducing the peak value of the structural stiffness, so that the stress area has better yielding and elongation ability and controllable collapse behavior, effectively delaying the propagation of shock waves and dispersing loads, and improving the response to impacts from different directions.

[0170] 4. The length of the connecting parts 32 on both sides of the limiting beam 3 is reduced, and it cooperates with the buffer 4 to support the busbar 7. This can reduce the amount of rigid parts and structural weight, reduce the complexity of the assembly, and improve production efficiency and lightweight performance.

[0171] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, include: The housing assembly (1) includes a bottom wall (10); The protective plate assembly (5) is located inside the housing assembly (1) and disposed on the bottom wall (10). A battery module (2) is disposed inside the housing assembly (1) and above the protective plate assembly (5). The battery module (2) includes a busbar (7) and a plurality of battery cells (20) arranged side by side along a first direction (x). Each battery cell (20) includes an electrode terminal (22) which is disposed toward the bottom wall (10). The busbar (7) is used to electrically connect the electrode terminals (22) of different battery cells (20). Multiple limiting beams (3) are disposed between the battery module (2) and the protective plate assembly (5). The limiting beams (3) are located at the end of the battery module (2) along the second direction (y) and outside the electrode terminal (22). The limiting beams (3) abut against the battery cell (20) and the protective plate assembly (5). The second direction (y) is perpendicular to the first direction (x). Multiple buffers (4) are abutted between the busbar (7) and the protective plate group (5), and each limiting beam (3) has the buffer (4) provided on at least one side where the electrode terminal (22) is provided along the second direction (y). The limiting beam (3) includes: a limiting part (31) abutting against the battery module (2); and a connecting part (32) connected to at least one side of the limiting part (31) along the second direction (y) and extending outward, and the connecting part (32) extending along the second direction (y) to no more than the outer edge of the electrode terminal (22); wherein the buffer member (4) has a groove (42) on its surface facing the protective plate group (5), and the connecting part (32) is embedded in the groove (42); the bottom surfaces of the limiting part (31), the connecting part (32) and the buffer member (4) are flush and all in contact with the protective plate group (5).

2. The battery device of claim 1, wherein The buffer (4) extends along the second direction (y) beyond the inner edge of the electrode terminal (22).

3. The battery device of claim 1, wherein The limiting part (31) has a cavity extending along the first direction (x).

4. The battery device of claim 1, wherein The plurality of limiting beams (3) include a first limiting beam (3A), and the battery device includes at least two battery modules (2) spaced apart along the second direction (y), with adjacent battery modules (2) sharing a first limiting beam (3A) at positions close to each other. For the first limiting beam (3A), the limiting part (31) is provided with the connecting part (32) and the buffer (4) on both sides along the second direction (y).

5. The battery device of claim 1, wherein The housing assembly (1) includes a plurality of expansion beams (13) extending along the second direction (y). The battery module (2) is provided with the expansion beams (13) at both ends along the first direction (x). The two ends of the limiting beam (3) are respectively connected to the expansion beams (13) at both ends of the battery module (2) by fasteners (6).

6. The battery device of claim 1, wherein The buffer (4) is provided with a plurality of through holes (41) spaced apart along the first direction (x), and the through holes (41) are positioned opposite to the electrode terminals (22).

7. The battery device of claim 1, wherein The cushioning element (4) is made of foam.

8. The battery device according to claim 1, characterized in that, The battery cell (20) includes a pressure relief component (23) and two electrode terminals (22) spaced apart along the second direction (y), with the pressure relief component (23) disposed between the two electrode terminals (22); The manifold (7) extends along the second direction (y) to an extent not exceeding the edge of the pressure relief component (23), and the buffer (4) extends along the second direction (y) to be flush with the manifold (7).

9. The battery device according to any one of claims 1 to 8, characterized in that, The protective panel assembly (5) includes: The bottom guard plate (52), made of metal, is used to bear the main impact force transmitted from the bottom wall (10); and A coating (51) is disposed between the bottom protective plate (52) and the bottom wall (10) to protect the bottom protective plate (52).

10. The battery device according to claim 9, characterized in that, The protective panel assembly (5) also includes: A honeycomb panel (53), disposed on the side of the bottom protective plate (52) away from the coating (51), is used to disperse the impact force transmitted by the bottom protective plate (52); and / or A composite material plate (54) is disposed on the side of the bottom protective plate (52) away from the coating (51), the composite material plate (54) comprising interlaced transverse and longitudinal fibers; and / or A mica plate (55) is disposed on the side of the bottom protective plate (52) away from the coating (51) and is attached to the limiting beam (3) and the buffer (4). The mica plate (55) is used for heat insulation and insulation.

11. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 10.

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