Battery device, box body and electric device

Abstract

The utility model provides a battery device, a box body and a power utilization device. The battery device comprises a box body and a battery monomer. The box body comprises a bottom plate, a side edge beam and a side collision reinforcing piece. And the side beams are connected with the bottom plate. A containing cavity with an opening is formed by the side edge beams and the bottom plate. And the side collision reinforcing piece is connected with the side edge beam. And the side collision reinforcers are arranged on the outer sides of the side edge beams. The side edge beams comprise a front edge beam, a left edge beam, a rear edge beam and a right edge beam which are connected. The front edge beam and the rear edge beam are arranged at intervals in the first direction. The left beam and the right beam are arranged at intervals in the second direction. The first direction is perpendicular to the second direction. And a side impact reinforcing piece is arranged in the middle area of at least one of the left side beam and the right side beam. The battery monomers are arranged in the accommodating cavities; the base plate supports the battery cells. According to the battery device provided by the invention, the safety of the battery device can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery device technology is an important factor related to its development. In the development of battery device technology, how to improve the safety of battery devices has always been a research direction in battery device technology. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device, a box, and an electrical device, which can help improve the safety of the battery device.

[0004] The present application provides a battery device, which includes a box body and a battery cell. The box body includes a bottom plate, a side beam and a side impact reinforcement. The side beam is connected to the bottom plate. The side beam and the bottom plate form a receiving cavity with an opening. The side impact reinforcement is connected to the side beam. The side impact reinforcement is arranged on the outside of the side beam. The side beam includes a front beam, a left beam, a rear beam and a right beam that are connected. The front beam and the rear beam are arranged at intervals along a first direction. The left beam and the right beam are arranged at intervals along a second direction. The first direction is perpendicular to the second direction. A side impact reinforcement is arranged in the middle area of ​​at least one of the left beam and the right beam. The battery cell is arranged in the receiving cavity. The bottom plate supports the battery cell.

[0005] In the battery device of the embodiment of the present application, a side impact reinforcement is provided on a local area of ​​the side beam. When the local area of ​​the side beam where the side impact reinforcement is provided is subjected to a side impact, the side impact reinforcement can collapse before the side beam to absorb the collision energy, thereby helping to reduce the possibility of the side beam collapsing, thereby reducing the possibility of the battery cell being squeezed and damaged due to the inward collapse of the side beam, thereby improving the safety of the battery device. The side impact reinforcement is provided on the outside of the side beam so that the side impact reinforcement does not occupy the internal space of the box body, thereby helping to arrange as many battery cells as possible in the accommodating cavity, thereby helping to improve the energy density of the battery device.

[0006] In some achievable embodiments, the box body further includes a vehicle body mounting part. The vehicle body mounting parts are respectively arranged on the outer side of the left beam and the outer side of the right beam. The vehicle body mounting part and the side impact reinforcement part are arranged on at least one of the left beam and the right beam, and the vehicle body mounting part and the side impact reinforcement part are arranged at intervals along the first direction.

[0007] When a local area on the side beam where a vehicle body mounting part is provided is subjected to a side collision, the vehicle body mounting part can collapse before the side beam to absorb the collision energy, thereby helping to reduce the possibility of collapse of the side beam, and further reducing the possibility of squeezing the battery cells due to the inward collapse of the side beam and causing damage to the battery cells, thereby improving the safety of the battery device.

[0008] The battery device box can be installed on the vehicle through the vehicle body mount, which is helpful to reduce the difficulty of connecting the battery device and the vehicle body. In addition, when transporting the battery device, the vehicle body mount can be connected to the sling to facilitate the connection between the battery device and the sling, and to facilitate the use of the sling to move the battery device.

[0009] In some practicable embodiments, the same number of vehicle body mounting components are respectively disposed on both sides of the side impact reinforcement along the first direction.

[0010] When the box of the battery device is installed on the vehicle through various body mounting parts, the body mounting parts located on both sides of the side impact reinforcement can help ensure the overall force balance of the battery device and improve the connection stability between the battery device and the vehicle body.

[0011] In some achievable embodiments, the side impact reinforcement has a first buffer cavity extending along a first direction.

[0012] When the side impact reinforcement bears the collision force, the side impact reinforcement can collapse and deform to compress the first buffer cavity. Since the first buffer cavity can form a buffer area, the side impact reinforcement is easy to absorb the collision energy through collapse and deformation, which is conducive to reducing the collision force borne by the side beam and reducing the possibility of collapse of the side beam.

[0013] In some achievable embodiments, a second buffer cavity is formed between the side impact reinforcement and the side beam, and extends along the first direction.

[0014] When the side impact reinforcement bears the collision force, the side impact reinforcement can collapse and deform to compress the second buffer cavity. Since the second buffer cavity can form a buffer area, the side impact reinforcement is easy to absorb the collision energy through collapse and deformation, which is conducive to reducing the collision force borne by the side beam and reducing the possibility of collapse of the side beam.

[0015] In some achievable embodiments, the box body further includes an energy absorbing member. The energy absorbing member is disposed inside at least one of the first buffer cavity and the second buffer cavity.

[0016] When the side impact reinforcement bears the collision force, the side impact reinforcement can collapse and deform to compress the first buffer cavity, the second buffer cavity and the energy absorbing member. The energy absorbing member itself can absorb the collision energy, which is conducive to further enhancing the energy absorption effect of the box. The side impact reinforcement and the energy absorbing member can absorb the collision energy together, which is conducive to further reducing the collision force borne by the side beam and reducing the possibility of collapse of the side beam.

[0017] In some feasible methods, the side impact reinforcement is welded to the side beam, which, on the one hand, helps to reduce the difficulty of connecting the side impact reinforcement and the side beam, and on the other hand, no additional connecting parts are required between the side impact reinforcement and the side beam, which helps to reduce the number of parts used. On the other hand, the welding connection method between the side impact reinforcement and the side beam helps to ensure that the connection strength between the side impact reinforcement and the side beam is relatively large, making it difficult for the side impact reinforcement and the side beam to separate.

[0018] In some achievable embodiments, at least one of the left beam and the right beam includes a side plate and an outer flange. The side plate is connected to the bottom plate. The outer flange is connected to the top of the side plate and extends in a direction away from the accommodating cavity. The side impact reinforcement is welded to the side plate. The side impact reinforcement is welded to the outer flange.

[0019] A welding area is formed between the side impact reinforcement and the side panel, and another welding area is formed by welding the side impact reinforcement to the outer flange. There are multiple different welding areas between the side impact reinforcement and the left beam or the side impact reinforcement and the right beam, which can help improve the connection stability between the side impact reinforcement and the left beam or the side impact reinforcement and the right beam, and reduce the possibility of separation between the side impact reinforcement and the left beam or the side impact reinforcement and the right beam.

[0020] In some achievable embodiments, the side panel includes a first vertical panel, a connecting panel, and a second vertical panel. The first vertical panel is connected to the bottom panel. The connecting panel connects the first vertical panel and the second vertical panel. The connecting panel and the second vertical panel are both located on the side of the first vertical panel facing the accommodating cavity. The outer flange is connected to the second vertical panel. The side impact reinforcement is welded to the first vertical panel. The side impact reinforcement is welded to the second vertical panel. There is a gap between the side impact reinforcement and the connecting panel. The connecting panel is inclined in a direction away from the bottom panel. The angle between the inner wall of the connecting panel and the inner wall of the first vertical panel is an obtuse angle. The angle between the outer wall of the connecting panel and the outer wall of the second vertical panel is an obtuse angle.

[0021] A recess may be formed between the outer flange, the second vertical plate and the connecting plate. A portion of the side impact reinforcement may be located in the recess. The recess may provide positioning for the side impact reinforcement, facilitating quick and accurate assembly of the side impact reinforcement with the side beam. The total thickness of the area on the side impact reinforcement corresponding to the recess may be relatively large, which is beneficial to increasing the collapse stroke of the side impact reinforcement and improving the effect of the side impact reinforcement in absorbing collision energy.

[0022] The side impact reinforcement and the first vertical plate, the side impact reinforcement and the second vertical plate, and the side impact reinforcement and the outer flange form multiple different welding areas, which can further help improve the connection stability between the side impact reinforcement and the left beam or the side impact reinforcement and the right beam, and reduce the possibility of separation between the side impact reinforcement and the left beam or the side impact reinforcement and the right beam.

[0023] The obtuse angle between the connecting plate and the first vertical plate is conducive to reducing the possibility of concentrated stress at the junction of the connecting plate and the first vertical plate, thereby reducing the possibility of fracture at the junction of the connecting plate and the first vertical plate. The obtuse angle between the connecting plate and the second vertical plate is conducive to reducing the possibility of concentrated stress at the junction of the connecting plate and the second vertical plate, thereby reducing the possibility of fracture at the junction of the connecting plate and the second vertical plate.

[0024] In some achievable embodiments, the side impact reinforcement comprises a first wall and a second wall connected to each other. The second wall is arranged between the first wall and the side beam. The second wall comprises a first folded edge, a second folded edge, a third folded edge, a fourth folded edge, a fifth folded edge and a sixth folded edge connected in sequence. The first folded edge is connected to an end of the first wall away from the outer flange. The second folded edge and the fourth folded edge are both connected to the first vertical plate and the second vertical plate. The distance between the second folded edge and the first wall is smaller than the distance between the fourth folded edge and the first wall. There is a gap between the third folded edge and the connecting plate. The sixth folded edge is connected to the surface of the first wall facing the side beam.

[0025] The first wall of the side impact reinforcement is the outer wall of the side impact reinforcement. When the side impact reinforcement is hit by a side impact, the first wall is first hit by the impact force, and then the first wall can transmit the force to the second wall located on the inner side. The first folded edge, the second folded edge, the third folded edge, the fourth folded edge, the fifth folded edge and the sixth folded edge of the first wall and the second wall can all be used to absorb impact energy, so that the side impact reinforcement can effectively absorb the collision energy, reduce the possibility of squeezing the battery cell due to the inward collapse of the side beam and causing damage to the battery cell, and improve the safety of the battery device.

[0026] In some achievable embodiments, a first welding point and a second welding point are provided between the second folded edge and the first vertical plate. Along the first direction, the edge of the second folded edge is welded to the first vertical plate through the first welding point, and a spacing is provided between the second welding point and the edge of the second folded edge. A first welding point and a second welding point are provided between the fourth folded edge and the second vertical plate. The edge of the fourth folded edge is welded to the second vertical plate through the first welding point, and a spacing is provided between the second welding point and the edge of the fourth folded edge.

[0027] The edge area and the inner area of ​​the side impact reinforcement are connected to the side beam by using the first welding point and the second welding point, respectively, so as to improve the connection strength between the side impact reinforcement and the side beam. In addition, the corresponding welding process can be matched according to the welding requirements of the edge area and the inner area of ​​the side impact reinforcement to reduce the difficulty of welding the side impact reinforcement and the side beam and improve the processing efficiency.

[0028] In some practicable embodiments, the side panels are single-layer panels, which helps to reduce the weight of the box and ensure that the battery device has a higher energy density.

[0029] In some achievable embodiments, a side impact reinforcement is disposed in the middle region of each of the left beam and the right beam. Along the first direction, the ratio of the size of the side impact reinforcement to the size of the left beam is in the range of 20% to 35%, and the ratio of the size of the side impact reinforcement to the size of the right beam is in the range of 20% to 35%.

[0030] The size of the side impact reinforcement is not likely to significantly increase the weight of the box body, provided that the side impact reinforcement meets the requirements for absorbing energy during a side impact, which is beneficial for ensuring that the battery device has a high energy density.

[0031] An embodiment of the present application provides a box for a battery device. The box includes a bottom plate, a side beam and a side impact reinforcement. The side beam is connected to the bottom plate. The side beam and the bottom plate form a receiving cavity with an opening. The side impact reinforcement is connected to the side beam. The side impact reinforcement is arranged on the outside of the side beam. The side beam includes a front beam, a left beam, a rear beam and a right beam that are connected. The front beam and the rear beam are arranged at intervals along a first direction. The left beam and the right beam are arranged at intervals along a second direction. The first direction is perpendicular to the second direction. A side impact reinforcement is arranged in the middle area of ​​at least one of the left beam and the right beam.

[0032] The embodiment of the present application provides an electric device, which includes the above-mentioned battery device. The battery device is used to provide electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0034] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0035] Figure 2 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0036] Figure 3It is a partial structural schematic diagram of a box provided in an embodiment of the application;

[0037] Figure 4 It is a schematic diagram of the partial structure of a box provided by an embodiment of the present application;

[0038] Figure 5 It is a schematic diagram of a partial cross-sectional structure of a box provided in one embodiment of the present application;

[0039] Figure 6 yes Figure 5 The enlarged schematic diagram of M1 in the middle;

[0040] Figure 7 It is a schematic diagram of a partial cross-sectional structure of a box provided in one embodiment of the present application;

[0041] Figure 8 yes Figure 7 The enlarged schematic diagram of M2 in the middle;

[0042] Fig. 9 It is a schematic diagram of a partial cross-sectional structure of a box provided in one embodiment of the present application;

[0043] Fig.10 It is a schematic diagram of the partial structure of a box provided by an embodiment of the present application;

[0044] Fig.11 yes Fig.10 Enlarged schematic diagram of M3 in the middle.

[0045] Description of reference numerals:

[0046] 1. Vehicle; 11. Controller; 12. Motor;

[0047] 10. Battery device;

[0048] 20. Battery cells;

[0049] 30. Box body; 301. Accommodating chamber;

[0050] 40. Bottom plate;

[0051] 50, side beam; 51, front beam; 52, left beam; 53, rear beam; 54, right beam;

[0052] 60, side impact reinforcement; 61, first buffer cavity; 62, first wall; 63, second wall; 631, first folding edge; 632, second folding edge; 633, third folding edge; 634, fourth folding edge; 635, fifth folding edge; 636, sixth folding edge;

[0053] 70. Car body mounting parts;

[0054] 80. A second buffer chamber;

[0055] 90. Energy absorbing parts;

[0056] 100, side plate; 101, first vertical plate; 102, connecting plate; 103, second vertical plate;

[0057] 110, outside turn-up;

[0058] 120. Gap;

[0059] 130. Concave;

[0060] 200, first welding point;

[0061] 210, second welding point;

[0062] X, first direction;

[0063] Y, second direction. DETAILED DESCRIPTION

[0064] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0065] 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.

[0066] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0067] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0068] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0069] In the description of the embodiments of the present application, unless otherwise clearly specified and 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. Moreover, a first feature being "above", "above" or "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 higher in level than the second feature. A first feature being "below", "below" or "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 lower in level than the second feature.

[0070] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0071] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery device mentioned in the present application may be a battery pack. For example, the battery device mentioned in the present application may include a battery module, etc. The battery device generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0072] During the production process of the battery device, the battery cells need to be placed in a box. The box protects the battery cells. In the present application, the battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells or magnesium-ion battery cells, etc., and the embodiments of the present application do not limit this. The battery cells may be flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0073] The inventors have noticed that the structural strength of local areas of the side beams of the box body is relatively low, so that after a collision occurs in the local area of ​​the side beam, the local area of ​​the side beam is prone to collapse, thereby squeezing and damaging the internal battery cells, affecting the safety of the battery device.

[0074] In order to alleviate the problem of low structural strength in local areas of the side beams of the box body, the applicant has found through research that the side beams can be strengthened so that the local areas of the side beams are less likely to collapse when impacted.

[0075] Based on the above considerations, in order to solve the problem of low structural strength in the local area of ​​the side beam of the box body, the inventor has designed a battery device after in-depth research. The battery device includes a box body and a battery cell. A side impact reinforcement is set in the local area of ​​the side beam of the box body. The side impact reinforcement can provide protection for the local area of ​​the side beam. When a collision occurs, the side impact reinforcement can absorb the collision energy, so that the local area of ​​the side beam is not easy to collapse when it is hit by a side collision, so as to reduce the possibility of damage to the battery cell caused by the collapse of the box body and squeezing the battery cell.

[0076] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0077] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecrafts, 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.

[0078] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including a box and electrical devices using the battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0079] Figure 1 The structure of the vehicle 1 is schematically shown. Figure 1As shown, vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is arranged inside the vehicle 1. The battery device 10 can be arranged at the bottom, head or tail of the vehicle 1. The battery device 10 can be used to power the vehicle 1. For example, the battery device 10 can be used as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to power the motor 12. For example, it is used for the working power demand of the vehicle 1 during startup, navigation and driving.

[0080] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , thereby replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0081] In order to meet different power usage requirements, the battery device 10 may include multiple battery cells. A battery cell refers to the smallest unit that constitutes a battery module or a battery pack. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for use in various applications. The battery device 10 mentioned in the present application includes a battery module or a battery pack. Among them, multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection refers to a mixture of series and parallel connection. In the embodiments of the present application, multiple battery cells can directly form a battery pack, or they can first form a battery module, and the battery module can then form a battery pack.

[0082] Figure 2 The structure of the battery device 10 is schematically shown. Figure 2 As shown, the battery device 10 includes a battery cell 20 and a box 30. The battery cell 20 is contained in the box 30. The box 30 may be made of alloy materials such as aluminum alloy, iron alloy, etc., which is not limited in the embodiment of the present application. The box 30 is used to contain the battery cell 20.

[0083] In the battery device 10, there can be one or more battery cells 20. The battery cell 20 refers to the smallest unit that constitutes the battery device 10. When there are multiple battery cells 20, the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 20 are both connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 30. Of course, multiple battery cells 20 can also be connected in series, in parallel, or in mixed connection to form a battery module. Multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 30.

[0084] In the embodiment of the present application, the battery cell 20 may include a lithium-ion battery cell 20, a sodium-ion battery cell 20, or a magnesium-ion battery cell 20, etc., which is not limited in the embodiment of the present application. The battery cell 20 may be a flat body, a rectangular parallelepiped, or other shapes, etc., which is not limited in the embodiment of the present application. However, for the sake of simplicity, the following embodiment is described by taking a square-shaped battery cell 20 as an example.

[0085] Figure 3 The partial structure of the box body 30 is schematically shown. Figure 2 and Figure 3 As shown, an embodiment of the present application provides a box body 30. The box body 30 includes a bottom plate 40, a side beam 50 and a side impact reinforcement 60. The side beam 50 is connected to the bottom plate 40. The side beam 50 and the bottom plate 40 form a receiving cavity 301 with an opening. The side impact reinforcement 60 is connected to the side beam 50. The side impact reinforcement 60 is arranged on the outer side of the side beam 50. The side beam 50 includes a front beam 51, a left beam 52, a rear beam 53 and a right beam 54 connected to each other. The front beam 51 and the rear beam 53 are arranged at intervals along a first direction X. The left beam 52 and the right beam 54 are arranged at intervals along a second direction Y. The first direction X is perpendicular to the second direction Y. The side impact reinforcement 60 is arranged in the middle area of ​​at least one of the left beam 52 and the right beam 54.

[0086] The battery cell 20 is disposed in the receiving cavity 301 of the box body 30. The bottom plate 40 of the box body 30 can support the battery cell 20. The number of the battery cell 20 can be multiple.

[0087] The side beam 50 can be connected to the edge of the bottom plate 40. The front beam 51, the left beam 52, the rear beam 53 and the right beam 54 can be connected in sequence to form a frame. The middle area of ​​the left beam 52 or the middle area of ​​the right beam 54 is an area on the left beam 52 or the right beam 54 where the structural strength is relatively low. The side impact reinforcement 60 can improve the structural strength of the middle area of ​​the left beam 52 or the middle area of ​​the right beam 54. The side impact reinforcement 60 can be made of a material with a predetermined hardness and strength. Exemplarily, the material of the side impact reinforcement 60 can include but is not limited to aluminum, aluminum alloy, steel or iron.

[0088] In the battery device 10 of the embodiment of the present application, a side impact reinforcement 60 is provided on a local area of ​​the side beam 50. When the local area of ​​the side beam 50 where the side impact reinforcement 60 is provided is subjected to a side impact, the side impact reinforcement 60 can collapse before the side beam 50 to absorb the collision energy, thereby reducing the possibility of the side beam 50 collapsing, thereby reducing the possibility of the battery cell 20 being squeezed and damaged due to the inward collapse of the side beam 50, and improving the safety of the battery device 10. The side impact reinforcement 60 is provided on the outside of the side beam 50, so that the side impact reinforcement 60 does not occupy the internal space of the box body 30, thereby facilitating the arrangement of as many battery cells 20 as possible in the accommodating cavity 301, and facilitating the improvement of the energy density of the battery device 10. The side impact reinforcement 60 is provided on the local area of ​​the side beam 50, which is conducive to increasing the structural strength of the side beam 50 without significantly increasing the overall weight of the battery device 10.

[0089] In some practicable embodiments, the middle area of ​​the left beam 52 and the middle area of ​​the right beam 54 in the side beam 50 are both provided with a side impact reinforcement 60. Therefore, when the middle area of ​​the left beam 52 or the middle area of ​​the right beam 54 is subjected to a side impact, the middle area of ​​the left beam 52 or the middle area of ​​the right beam 54 is not prone to collapse and deformation, thereby improving the safety of the battery device 10.

[0090] In some achievable embodiments, a side impact reinforcement 60 is disposed in the middle region of each of the left beam 52 and the right beam 54. Along the first direction X, the size of the side impact reinforcement 60 is smaller than the size of the left beam 52. Along the first direction X, the ratio of the size of the side impact reinforcement 60 to the size of the left beam 52 is in a range of 20% to 35%.

[0091] Along the first direction X, the size of the side impact reinforcement 60 is smaller than the size of the right side beam 54. The ratio of the size of the side impact reinforcement 60 to the size of the right side beam 54 is in a range of 20% to 35%. Under the premise of satisfying the energy absorption of the side impact, the size of the side impact reinforcement 60 is not likely to increase the weight of the box 30 by a large amount, which is conducive to ensuring that the battery device 10 has a higher energy density.

[0092] In some practicable ways, the battery device 10 can be installed on the vehicle through the box 30. The left side beam 52 and the right side beam 54 are respectively provided on the left and right sides of the vehicle. The front side beam 51 and the rear side beam 53 are respectively provided on the front and rear sides of the vehicle. In the side pole collision test condition, the left or right side of the vehicle is subjected to collision.

[0093] In some achievable ways, Figure 4 The partial structure of the box body 30 is schematically shown. Figure 3 and Figure 4As shown, the box body 30 further includes a vehicle body mounting member 70. The vehicle body mounting member 70 is respectively disposed on the outer side of the left beam 52 and the outer side of the right beam 54. The vehicle body mounting member 70 and the side impact reinforcement member 60 are disposed on at least one of the left beam 52 and the right beam 54. The vehicle body mounting member 70 and the side impact reinforcement member 60 are disposed at intervals along the first direction X.

[0094] When a local area of ​​the side beam 50 where the vehicle body mounting part 70 is provided is subjected to a side collision, the vehicle body mounting part 70 may collapse before the side beam 50 to absorb the collision energy, thereby helping to reduce the possibility of collapse of the side beam 50, thereby reducing the possibility of squeezing the battery cell 20 due to the inward collapse of the side beam 50 and causing damage to the battery cell 20, thereby improving the safety of the battery device 10.

[0095] The box 30 of the battery device 10 can be installed on the vehicle through the vehicle body mounting part 70, which is helpful to reduce the difficulty of connecting the battery device 10 and the vehicle body. In addition, when transporting the battery device 10, the vehicle body mounting part 70 can be connected to the sling to facilitate the connection between the battery device 10 and the sling, and at the same time, it is convenient to use the sling to move the battery device 10.

[0096] In some examples, the vehicle body mounting part 70 may be detachably connected to the vehicle body. For example, the vehicle body mounting part 70 may be detachably connected to the vehicle body by fasteners such as screws.

[0097] In some examples, the vehicle body mounting component 70 and the side impact reinforcement component 60 are disposed on the left side beam 52, and the vehicle body mounting component 70 and the side impact reinforcement component 60 on the left side beam 52 are spaced apart along the first direction X. The vehicle body mounting component 70 and the side impact reinforcement component 60 are disposed on the right side beam 54, and the vehicle body mounting component 70 and the side impact reinforcement component 60 on the right side beam 54 are spaced apart along the first direction X.

[0098] In some examples, the vehicle body mounting part 70 may be welded to the left beam 52 or the right beam 54. The vehicle body mounting part 70 may be made of a material having a predetermined hardness and strength. For example, the material of the vehicle body mounting part 70 may include but is not limited to aluminum, aluminum alloy, steel or iron.

[0099] In some examples, the vehicle body mounting component 70 may be a mounting plate.

[0100] In some examples, the same number of vehicle body mounting parts 70 are respectively disposed on both sides of the side impact reinforcement 60 along the first direction X. When the box 30 of the battery device 10 is installed on the vehicle through each vehicle body mounting part 70, the vehicle body mounting parts 70 located on both sides of the side impact reinforcement 60 can help ensure that the overall force of the battery device 10 is balanced and improve the connection stability between the battery device 10 and the vehicle body.

[0101] Exemplarily, along the first direction X, two vehicle body mounting components 70 are respectively disposed on both sides of the side impact reinforcement 60 .

[0102] In some achievable ways, Figure 5 The partial cross-sectional structure of the box body 30 is schematically shown. Figure 6 yes Figure 5 Enlarged view of M1 in the middle. Figure 5 and Figure 6 As shown, the side impact reinforcement 60 has a first buffer cavity 61. The first buffer cavity 61 extends along the first direction X.

[0103] When the side impact reinforcement 60 bears the collision force, the side impact reinforcement 60 can collapse and deform to compress the first buffer cavity 61. Since the first buffer cavity 61 can form a buffer area, the side impact reinforcement 60 is easy to absorb the collision energy through collapse and deformation, so as to reduce the collision force borne by the side beam 50 and reduce the possibility of collapse of the side beam 50.

[0104] In some achievable embodiments, a second buffer cavity 80 is formed between the side impact reinforcement 60 and the side beam 50 . The second buffer cavity 80 extends along the first direction X. The second buffer cavity 80 may be formed between at least one of the left beam 52 and the right beam 54 and the side impact reinforcement 60 .

[0105] When the side impact reinforcement 60 bears the collision force, the side impact reinforcement 60 can collapse and deform to compress the second buffer cavity 80. Since the second buffer cavity 80 can form a buffer area, the side impact reinforcement 60 is easy to absorb the collision energy through collapse and deformation, so as to reduce the collision force borne by the side beam 50 and reduce the possibility of collapse of the side beam 50.

[0106] In some examples, the left side beam 52 is provided with a side impact reinforcement 60. A second cushion cavity 80 is formed between the side impact reinforcement 60 and the left side beam 52. The right side beam 54 is provided with a side impact reinforcement 60. A second cushion cavity 80 is formed between the side impact reinforcement 60 and the right side beam 54.

[0107] In some examples, at least one of the first buffer cavity 61 and the second buffer cavity 80 is a through hole extending along the first direction X. The first buffer cavity 61 and the second buffer cavity 80 are separated by the side impact reinforcement 60 , so that the first buffer cavity 61 and the second buffer cavity 80 are not connected to each other.

[0108] In some examples, Figure 7 The partial cross-sectional structure of the box body 30 is schematically shown. Figure 8 yes Figure 7 Enlarged view of M2 in the middle. Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the box body 30 further includes an energy absorbing member 90. The energy absorbing member 90 is disposed inside at least one of the first buffer cavity 61 and the second buffer cavity 80.

[0109] When the side impact reinforcement 60 bears the collision force, the side impact reinforcement 60 can collapse and deform to compress the first buffer cavity 61, the second buffer cavity 80 and the energy absorbing member 90. The energy absorbing member 90 can absorb the collision energy by itself, which is beneficial to further enhance the energy absorption effect of the box body 30. The side impact reinforcement 60 and the energy absorbing member 90 can absorb the collision energy together, which is beneficial to further reduce the collision force borne by the side beam 50 and reduce the possibility of collapse of the side beam 50.

[0110] Exemplarily, energy absorbing members 90 are disposed inside the first buffer cavity 61 and inside the second buffer cavity 80 .

[0111] For example, the energy absorbing member 90 may be an elastic member, and the energy absorbing member 90 itself may absorb the collision energy through elastic deformation.

[0112] For example, the energy absorbing member 90 may include but is not limited to polyurethane foam. The energy absorbing member 90 fills the first buffer cavity 61 or the second buffer cavity 80 .

[0113] In some feasible embodiments, the side impact reinforcement 60 is welded to the side beam 50, which, on the one hand, helps to reduce the difficulty of connecting the side impact reinforcement 60 and the side beam 50, and on the other hand, no additional connecting parts are required between the side impact reinforcement 60 and the side beam 50, which helps to reduce the number of parts used. On the other hand, the welding connection between the side impact reinforcement 60 and the side beam 50 helps to ensure that the connection strength between the side impact reinforcement 60 and the side beam 50 is relatively large, making it difficult for the side impact reinforcement 60 and the side beam 50 to separate.

[0114] In some examples, a side impact reinforcement 60 is disposed on the left side beam 52 . The side impact reinforcement 60 is welded to the left side beam 52 . A side impact reinforcement 60 is disposed on the right side beam 54 . The side impact reinforcement 60 is welded to the right side beam 54 .

[0115] In some examples, Fig. 9 The partial cross-sectional structure of the box body 30 is schematically shown. Figure 7 , Figure 8 and Fig. 9 As shown, at least one of the left beam 52 and the right beam 54 includes a side plate 100 and an outer flange 110. The side plate 100 is connected to the bottom plate 40. The outer flange 110 is connected to the top of the side plate 100 and extends in a direction away from the accommodating cavity 301. The outer flange 110 is arranged on the side of the side plate 100 facing away from the accommodating cavity 301. The side impact reinforcement 60 is welded to the side plate 100. The side impact reinforcement 60 is welded to the outer flange 110.

[0116] A welding area is formed between the side impact reinforcement 60 and the side plate 100, and another welding area is formed by welding the side impact reinforcement 60 to the outer flange 110. There are multiple different welding areas between the side impact reinforcement 60 and the left beam 52 or the side impact reinforcement 60 and the right beam 54, which can help improve the connection stability between the side impact reinforcement 60 and the left beam 52 or the side impact reinforcement 60 and the right beam 54, and reduce the possibility of separation between the side impact reinforcement 60 and the left beam 52 or the side impact reinforcement 60 and the right beam 54.

[0117] In some examples, the left beam 52 and the right beam 54 both include a side plate 100 and an outer flange 110. For example, the structures of the left beam 52 and the right beam 54 can be the same.

[0118] For some examples, see Figure 7 , Figure 8 and Fig. 9 As shown, the side plate 100 includes a first vertical plate 101, a connecting plate 102 and a second vertical plate 103. The first vertical plate 101 is connected to the bottom plate 40. The connecting plate 102 connects the first vertical plate 101 and the second vertical plate 103. The connecting plate 102 and the second vertical plate 103 are both located on the side of the first vertical plate 101 facing the accommodating cavity 301. The outer flange 110 is connected to the second vertical plate 103. The side impact reinforcement 60 is welded to the first vertical plate 101. The side impact reinforcement 60 is welded to the second vertical plate 103. There is a gap 120 between the side impact reinforcement 60 and the connecting plate 102.

[0119] A recess 130 may be formed between the outer flange 110, the second vertical plate 103 and the connecting plate 102. A portion of the side impact reinforcement 60 may be located in the recess 130. The recess 130 may provide positioning for the side impact reinforcement 60, so as to facilitate rapid and accurate assembly of the side impact reinforcement 60 with the side beam 50. The total thickness of the area on the side impact reinforcement 60 corresponding to the recess 130 may be relatively large, which is conducive to increasing the collapse stroke of the side impact reinforcement 60 and improving the effect of the side impact reinforcement 60 in absorbing collision energy.

[0120] The side impact reinforcement 60 and the first vertical plate 101, the side impact reinforcement 60 and the second vertical plate 103, and the side impact reinforcement 60 and the outer flange 110 form multiple different welding areas, which can further help to improve the connection stability between the side impact reinforcement 60 and the left beam 52 or the side impact reinforcement 60 and the right beam 54, and reduce the possibility of separation between the side impact reinforcement 60 and the left beam 52 or the side impact reinforcement 60 and the right beam 54.

[0121] In some examples, the connecting plate 102 is inclined away from the bottom plate 40. The included angle W1 between the inner wall of the connecting plate 102 and the inner wall of the first vertical plate 101 is an obtuse angle. The included angle W2 between the outer wall of the connecting plate 102 and the outer wall of the second vertical plate 103 is an obtuse angle.

[0122] The angle W1 between the connecting plate 102 and the first vertical plate 101 is an obtuse angle, which is conducive to reducing the possibility of concentrated stress at the junction of the connecting plate 102 and the first vertical plate 101, thereby reducing the possibility of fracture at the junction of the connecting plate 102 and the first vertical plate 101. The angle W2 between the connecting plate 102 and the second vertical plate 103 is an obtuse angle, which is conducive to reducing the possibility of concentrated stress at the junction of the connecting plate 102 and the second vertical plate 103, thereby reducing the possibility of fracture at the junction of the connecting plate 102 and the second vertical plate 103.

[0123] In some examples, the first riser 101 and the second riser 103 are parallel to each other.

[0124] In some examples, the side plate 100 is a single-layer plate, which helps to reduce the weight of the box body 30 and ensure that the battery device 10 has a higher energy density.

[0125] For some examples, see Figure 5 , Figure 6 and Fig. 9 As shown, the side impact reinforcement 60 includes a first wall 62 and a second wall 63 connected to each other. The second wall 63 is arranged between the first wall 62 and the side beam 50. The second wall 63 includes a first folded edge 631, a second folded edge 632, a third folded edge 633, a fourth folded edge 634, a fifth folded edge 635 and a sixth folded edge 636 connected to each other in sequence.

[0126] The first folded edge 631 is connected to an end of the first wall 62 away from the outer flange 110. The second folded edge 632 and the fourth folded edge 634 are both connected to the first vertical plate 101 and the second vertical plate 103. The distance between the second folded edge 632 and the first wall 62 is smaller than the distance between the fourth folded edge 634 and the first wall 62. There is a gap 120 between the third folded edge 633 and the connecting plate 102. The sixth folded edge 636 is connected to the surface of the first wall 62 facing the side beam 50.

[0127] The first wall 62 of the side impact reinforcement 60 is the outer wall of the side impact reinforcement 60. When the side impact reinforcement 60 is subjected to a side impact, the first wall 62 is first subjected to the impact force, and then the first wall 62 can transmit the force to the second wall 63 located on the inner side. The first wall 62, the first folded edge 631, the second folded edge 632, the third folded edge 633, the fourth folded edge 634, the fifth folded edge 635 and the sixth folded edge 636 of the second wall 63 can all be used to absorb impact energy, so that the side impact reinforcement 60 can effectively absorb the collision energy, reduce the possibility of squeezing the battery cell 20 due to the inward collapse of the side beam 50 and causing damage to the battery cell 20, and improve the safety of the battery device 10.

[0128] Exemplarily, the first wall 62 and the second wall 63 of the side impact reinforcement 60 are an integrally formed structure.

[0129] Exemplarily, the first folded edge 631 and the fifth folded edge 635 are arranged in parallel. The second folded edge 632, the fourth folded edge 634 and the sixth folded edge 636 are arranged in parallel with each other. The third folded edge 633 is arranged in parallel with the connecting plate 102.

[0130] Exemplarily, a portion of the first wall 62, the first fold 631, the second fold 632, the third fold 633, the fourth fold 634, the fifth fold 635 and the sixth fold 636 together form the first buffer cavity 61. A portion of the first wall 62, the outer flange 110 and a portion of the side plate 100 together form the second buffer cavity 80.

[0131] In some examples, Fig.10 The partial structure of the box body 30 is schematically shown. Fig.11 yes Fig.10 Enlarged view of M3 in the middle. Figure 5 , Figure 6 , Fig. 9 , Fig.10 and Fig.11 As shown, a first welding point 200 and a second welding point 210 are provided between the second folded edge 632 and the first vertical plate 101. Along the first direction X, the edge of the second folded edge 632 is welded to the first vertical plate 101 through the first welding point 200. Along the first direction X, there is a spacing between the second welding point 210 and the edge of the second folded edge 632.

[0132] A first welding point 200 and a second welding point 210 are provided between the fourth folded edge 634 and the second vertical plate 103. Along the first direction X, the edge of the fourth folded edge 634 is welded to the second vertical plate 103 via the first welding point 200. Along the first direction X, there is a gap between the second welding point 210 and the edge of the fourth folded edge 634.

[0133] The edge area and the inner area of ​​the side impact reinforcement 60 are connected to the side beam 50 by using the first welding point 200 and the second welding point 210, respectively, so as to improve the connection strength between the side impact reinforcement 60 and the side beam 50. In addition, according to the welding requirements of the edge area and the inner area of ​​the side impact reinforcement 60, the corresponding welding process can be matched for welding, so as to reduce the difficulty of welding the side impact reinforcement 60 and the side beam 50 and improve the processing efficiency.

[0134] Exemplarily, the side impact reinforcement 60 and the side rail 50 are welded by an inert gas shielded welding (MIG welding) process to form a first weld 200 . The side impact reinforcement 60 and the side rail 50 are welded by a friction stir welding (FSW welding) process to form a second weld 210 .

[0135] According to some embodiments of the present application, the present application also provides a box 30 for a battery device 10. The box 30 includes a bottom plate 40, a side beam 50 and a side impact reinforcement 60. Among them, the side beam 50 is connected to the bottom plate 40. The side beam 50 and the bottom plate 40 form a receiving cavity 301 with an opening. The side impact reinforcement 60 is connected to the side beam 50. The side impact reinforcement 60 is arranged on the outside of the side beam 50. The side beam 50 includes a front beam 51, a left beam 52, a rear beam 53 and a right beam 54 connected to each other. The front beam 51 and the rear beam 53 are arranged at intervals along a first direction X. The left beam 52 and the right beam 54 are arranged at intervals along a second direction Y. The first direction X is perpendicular to the second direction Y. The side impact reinforcement 60 is arranged in the middle area of ​​at least one of the left beam 52 and the right beam 54.

[0136] According to some embodiments of the present application, the present application further provides an electric device, including the battery device 10 of any of the above solutions, and the battery device 10 is used to provide electric energy to the electric device. The electric device can be any of the above-mentioned devices or systems using the battery device 10.

[0137] In some achievable embodiments, the electrical device is a vehicle 1. A left beam 52 and a right beam 54 are respectively disposed on the left and right sides of the vehicle 1.

[0138] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 comprises a bottom plate, a side beam and a side impact reinforcement, wherein the side beam is connected to the bottom plate, the side beam and the bottom plate form a receiving cavity with an opening, the side impact reinforcement is connected to the side beam, and the side impact reinforcement is arranged on the outer side of the side beam; The side beam comprises a front side beam, a left side beam, a rear side beam and a right side beam which are connected to each other, the front side beam and the rear side beam are arranged at intervals along a first direction, the left side beam and the right side beam are arranged at intervals along a second direction, the first direction is perpendicular to the second direction, and the side impact reinforcement is arranged in the middle area of ​​at least one of the left side beam and the right side beam; The battery cell is arranged in the accommodating cavity, and the bottom plate supports the battery cell.

2. The battery device according to claim 1, characterized in that: The box body also includes a vehicle body mounting component, which is respectively arranged on the outer side of the left beam and the outer side of the right beam, and the vehicle body mounting component and the side impact reinforcement are arranged on at least one of the left beam and the right beam, and the vehicle body mounting component and the side impact reinforcement are arranged at intervals along the first direction.

3. The battery device according to claim 2, characterized in that: Along the first direction, the same number of vehicle body mounting parts are respectively arranged on both sides of the side impact reinforcement.

4. The battery device according to claim 1, characterized in that: The side impact reinforcement has a first buffer cavity extending along the first direction.

5. The battery device according to claim 4, characterized in that: A second buffer cavity is formed between the side impact reinforcement and the side beam, and the second buffer cavity extends along the first direction.

6. The battery device according to claim 5, characterized in that: The box body further includes an energy absorbing member, and the energy absorbing member is disposed inside at least one of the first buffer cavity and the second buffer cavity.

7. The battery device according to any one of claims 1 to 6, characterized in that: The side impact reinforcement is welded to the side beam.

8. The battery device according to claim 7, characterized in that: At least one of the left beam and the right beam includes a side plate and an outer flange, the side plate is connected to the bottom plate, the outer flange is connected to the top end of the side plate and extends in a direction away from the accommodating cavity, the side impact reinforcement is welded to the side plate, and the side impact reinforcement is welded to the outer flange.

9. The battery device according to claim 8, characterized in that: The side plate includes a first vertical plate, a connecting plate and a second vertical plate, the first vertical plate is connected to the bottom plate, the connecting plate connects the first vertical plate and the second vertical plate, the connecting plate and the second vertical plate are both located on the side of the first vertical plate facing the accommodating cavity, the outer flange is connected to the second vertical plate, the side impact reinforcement is welded to the first vertical plate, the side impact reinforcement is welded to the second vertical plate, a gap is provided between the side impact reinforcement and the connecting plate, the connecting plate is inclined in a direction away from the bottom plate, an angle between an inner wall of the connecting plate and an inner wall of the first vertical plate is an obtuse angle, and an angle between an outer wall of the connecting plate and an outer wall of the second vertical plate is an obtuse angle.

10. The battery device according to claim 9, characterized in that: The side impact reinforcement includes a first wall and a second wall connected to each other, the second wall is arranged between the first wall and the side beam, the second wall includes a first folded edge, a second folded edge, a third folded edge, a fourth folded edge, a fifth folded edge and a sixth folded edge connected in sequence, the first folded edge is connected to an end of the first wall away from the outer flange, the second folded edge and the fourth folded edge are both connected to the first vertical plate and the second vertical plate, the distance between the second folded edge and the first wall is smaller than the distance between the fourth folded edge and the first wall, there is a gap between the third folded edge and the connecting plate, and the sixth folded edge is connected to the surface of the first wall facing the side beam.

11. The battery device according to claim 10, characterized in that: A first welding point and a second welding point are set between the second folded edge and the first vertical plate. Along the first direction, the edge of the second folded edge is welded to the first vertical plate through the first welding point, and there is a distance between the second welding point and the edge of the second folded edge. The first welding point and the second welding point are set between the fourth folded edge and the second vertical plate. The edge of the fourth folded edge is welded to the second vertical plate through the first welding point, and there is a distance between the second welding point and the edge of the fourth folded edge.

12. The battery device according to claim 8, characterized in that: The side panel is a single-layer panel.

13. The battery device according to any one of claims 1 to 6, characterized in that: The side impact reinforcement is arranged in the middle area of ​​each of the left beam and the right beam. Along the first direction, the ratio of the size of the side impact reinforcement to the size of the left beam is in a range of 20% to 35%, and the ratio of the size of the side impact reinforcement to the size of the right beam is in a range of 20% to 35%.

14. A box for a battery device, characterized in that: The box body comprises: Floor, side beams and side impact reinforcements; Among them, the side beam is connected to the bottom plate, and the side beam and the bottom plate form a accommodating cavity with an opening, and the side impact reinforcement is connected to the side beam, and the side impact reinforcement is arranged on the outside of the side beam; the side beam includes a connected front beam, a left beam, a rear beam and a right beam, the front beam and the rear beam are arranged at intervals along a first direction, the left beam and the right beam are arranged at intervals along a second direction, the first direction is perpendicular to the second direction, and the side impact reinforcement is arranged in the middle area of ​​at least one of the left beam and the right beam.

15. An electrical device, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 13, wherein the battery device is used to provide electrical energy.

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