Battery device and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery device and a power utilization device, the battery device comprises a box body assembly and a battery monomer assembly, the box body assembly is provided with an accommodating space, and the battery monomer assembly is arranged in the accommodating space. The box body assembly comprises a buffer structure, the buffer structure comprises a first plate part, a second plate part and a buffer unit, the first plate part and the second plate part are stacked, and a mounting space is defined between the first plate part and the second plate part. The installation space is filled with the buffer unit, the buffer unit comprises a plurality of hollow buffer bodies, and buffer cavities are formed in the hollow buffer bodies. When the box body assembly is collided and impacted, certain impact energy can be absorbed by utilizing the plurality of hollow buffer bodies in the buffer structure, so that the energy absorption performance of the box body assembly when the box body assembly is collided is improved, the damage degree of the battery monomer assembly in the box body assembly after the collision and the impact is reduced, and the impact resistance of the battery device is improved.

Description

Technical Field

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

[0002] The box assembly is an important component of the battery device, which plays the role of protecting and accommodating the battery cell assembly. In electric devices such as new energy vehicles equipped with battery devices, when the electric device collides, the collision impact is easily transmitted to the box assembly of the battery device. Therefore, the impact resistance of the box assembly is very important to the safety of the battery device. In the related art, the box assembly has the problem of poor impact resistance. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a battery device and an electrical device to improve the impact resistance of the box assembly.

[0004] In a first aspect, an embodiment of the present application provides a battery device, comprising:

[0005] A box assembly having a receiving space;

[0006] A battery cell assembly is arranged in the accommodation space;

[0007] The box assembly includes a buffer structure, the buffer structure includes a first plate portion, a second plate portion and a buffer unit, the first plate portion and the second plate portion are stacked and define an installation space therebetween;

[0008] The buffer unit fills the installation space, and the buffer unit includes a plurality of hollow buffer bodies, and a buffer cavity is formed inside the hollow buffer bodies.

[0009] In the above technical solution, when the box assembly is subjected to a collision impact, the multiple hollow buffer bodies in the buffer structure can absorb a certain amount of impact energy to improve the energy absorption performance of the box assembly when it is subjected to a collision, which is beneficial to reducing the degree of damage to the battery cell assembly inside the box assembly after the collision impact and improving the impact resistance of the battery device.

[0010] In some embodiments, the buffer cavity is a closed cavity.

[0011] In the above technical solution, the closed cavity can make the hollow buffer body have a certain deformation ability to absorb impact energy during deformation after collision impact, and can also provide deformation space for the box assembly, further reducing the degree of damage to the battery cell assembly after collision impact.

[0012] In some embodiments, the buffer unit includes an adhesive, and the adhesive is used to bond the hollow buffer body to the first plate portion and / or the second plate portion.

[0013] In the above technical solution, the adhesive can reduce the shaking of the hollow buffer body and reduce the noise of the battery device during use.

[0014] In some embodiments, the hollow buffer body includes a first half shell and a second half shell, the first half shell and the second half shell are split structures, and the first half shell and the second half shell are interconnected and enclosed to form the buffer cavity.

[0015] In the above technical solution, by setting the hollow buffer body as a split structure, it is convenient for separate production and manufacturing, which is beneficial to the mass production of the hollow buffer body and improves the production efficiency.

[0016] In some embodiments, the hollow buffer body is a steel part, an aluminum part or a non-metal part.

[0017] In the above technical solution, the hollow buffer body of the steel part has greater structural strength and better impact resistance and energy absorption effect; the hollow buffer body of the aluminum part has a lower density, which is beneficial to reducing the weight of the box assembly and the weight of the battery device; the hollow buffer body of the non-metallic part has lower electrical and thermal conductivity, which is beneficial to blocking the path of heat and current transfer from the battery device to the outside, thereby improving the safety of the battery device.

[0018] In some embodiments, the hollow buffer body is in the shape of a hollow sphere or a spherical cap.

[0019] In the above technical solution, by setting the hollow buffer body to be spherical or spherical crown, it is easy to stamp and form, which is beneficial to the production of the hollow buffer body and improves production efficiency.

[0020] In some embodiments, the thickness of the cavity wall of the buffer cavity is 0.05 mm to 0.3 mm.

[0021] In the above technical solution, by setting the thickness of the cavity wall of the buffer cavity to 0.05 mm to 0.3 mm, the hollow buffer body can have good deformation ability to obtain a better energy absorption effect.

[0022] In some embodiments, the diameter of the hollow buffer body is 1 mm to 10 mm.

[0023] In the above technical solution, by setting the diameter of the hollow buffer body to 1 mm to 10 mm, the hollow buffer body can have better impact resistance, thereby improving the impact resistance of the box assembly.

[0024] In some embodiments, the hollow buffer body is in the shape of a hollow spherical crown, and the outer surface of the hollow buffer body includes a spherical surface and a plane, the multiple hollow buffer bodies include multiple first hemispheres and multiple second hemispheres, the plane of the first hemisphere faces the first plate portion, the plane of the second hemisphere faces the second plate portion, and in the plane projection parallel to the first plate portion and / or the second plate portion, the first hemispheres and the second hemispheres are arranged alternately.

[0025] In the above technical solution, by alternating the first hemisphere and the second hemisphere, the first hemisphere transfers force to the adjacent second hemisphere when deformed by force, and can absorb impact energy during deformation after collision, thereby improving the energy absorption effect of the box assembly when it is impacted.

[0026] In some embodiments, the buffer cavity is filled with foaming material and / or phase change material.

[0027] In the above technical solution, the foam material can reduce the force and disperse it to the wall of the buffer cavity when it is deformed by force, and can absorb impact energy during deformation after collision, thereby improving the energy absorption effect of the box assembly when it is impacted; the phase change material can absorb or release heat in the process of changing the material state, and can improve the thermal insulation performance of the box assembly.

[0028] In some embodiments, the box assembly includes a box and an expansion beam, the box defines the accommodation space, and the expansion beam is disposed in the accommodation space and connected to the box;

[0029] Wherein, the buffer structure is constructed as a part of the box body, and / or the buffer structure is constructed as at least a part of the expansion beam.

[0030] In the above technical solution, the buffer structure is formed as a part of the box body and / or the expansion beam, so that the impact resistance and energy absorption effect of the box body and / or the expansion beam can be improved.

[0031] In a second aspect, an embodiment of the present application provides an electrical device, including the battery device described in any embodiment of the present application, wherein the battery device is used to provide electrical energy.

[0032] In the above technical scheme, by adopting the battery device involved above, when the box assembly is subjected to collision impact, the multiple hollow buffer bodies in the buffer structure can absorb a certain impact energy, so as to improve the energy absorption performance of the box assembly when it is subjected to collision, which is beneficial to reduce the degree of damage to the battery cell assembly inside the box assembly after the collision impact, improve the impact resistance of the battery device, and thus improve the safety of the use of the electrical device.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of an electric device provided in an embodiment of the present application;

[0035] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0036] Figure 3 for Figure 2 A schematic diagram of a portion of the structure of the middle box assembly;

[0037] Figure 4 for Figure 3 Schematic diagram of the cross section at AA in the middle;

[0038] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0039] Figure 6 for Figure 5 Schematic diagram of the structure of the hollow buffer body.

[0040] Description of Reference Numerals

[0041] 10. Battery device; 21. Box assembly; 211. First box; 212. Second box; 11. Buffer structure; 11a. Installation space; 111. First plate; 112. Second plate; 113. Hollow buffer body; 113a. Buffer cavity; 113b. Spherical surface; 113c. Plane; 1131. First hemisphere; 1132. Second hemisphere; 3. Vehicle; 31. Controller; 32. Motor. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0044] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the specific corresponding schematic diagrams, which may be the left and right directions in normal use or not.

[0045] It should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. "At least two" means greater than or equal to two.

[0046] 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 are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as aerospace and other fields. With the continuous expansion of the application field of battery devices, its market demand is also constantly expanding, and its output is also constantly increasing.

[0047] The box assembly is an important part of the battery device, which plays the role of protecting and accommodating the battery monomer assembly. In a new energy vehicle equipped with a battery device, after a vehicle collision, the collision impact will be transmitted to the box assembly of the battery device.

[0048] The applicant has found that in the related art, the box assembly has poor impact resistance, which can easily cause the battery cell assembly inside the box to be squeezed and deformed. The battery cells in the battery cell assembly are prone to thermal runaway after deformation, affecting the safety of the battery device.

[0049] Based on the above considerations, in order to improve the impact resistance of the box assembly, the applicant has designed a battery device after in-depth research, including a box assembly and a battery cell assembly, the box assembly has a storage space, and the battery cell assembly is arranged in the storage space. The box assembly includes a buffer structure, the buffer structure includes a first plate portion, a second plate portion and a buffer unit, the first plate portion and the second plate portion are stacked and define an installation space between the two. The buffer unit fills the installation space, and the buffer unit includes a plurality of hollow buffer bodies, and the hollow buffer bodies have a buffer cavity inside. In this way, when the box assembly is subjected to a collision impact, the plurality of hollow buffer bodies in the buffer structure can absorb a certain amount of impact energy to improve the energy absorption performance of the box assembly when it is subjected to a collision, which is beneficial to reduce the degree of damage to the battery cell assembly inside the box assembly after a collision impact, and improve the impact resistance of the battery device.

[0050] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0051] See also Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 3 provided for some embodiments of the present application. The vehicle 3 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 3, and the battery device 10 may be provided at the bottom, head or tail of the vehicle 3. The battery device 10 may be used to power the vehicle 3, for example, the battery device 10 may be used as an operating power source for the vehicle 3. The vehicle 3 may also include a controller 31 and a motor 32, and the controller 31 is used to control the battery device 10 to power the motor 32, for example, for the starting, navigation and working power requirements of the vehicle 3 during driving.

[0052] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 3 , but also serve as a driving power source for the vehicle 3 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 3 .

[0053] The present application embodiment provides a battery device 10, please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5The battery device 10 includes a box assembly 21 and a battery cell assembly. The box assembly 21 has a storage space, and the battery cell assembly is arranged in the storage space. The box assembly 21 includes a buffer structure 11, and the buffer structure 11 includes a first plate portion 111, a second plate portion 112, and a buffer unit. The first plate portion 111 and the second plate portion 112 are stacked and define an installation space 11a therebetween. The buffer unit fills the installation space 11a, and the buffer unit includes a plurality of hollow buffer bodies 113, and the hollow buffer bodies 113 have a buffer cavity 113a therein.

[0054] The battery apparatus 10 (Battery Apparatus) mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0055] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0056] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0057] In some embodiments, the battery cell may include a shell. The shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0058] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0059] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0060] In some embodiments, the battery device 10 may be a battery pack, which includes a box assembly 21 and one or more battery cell assemblies, wherein the battery cell assembly is accommodated in the box assembly 21 .

[0061] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box assembly 21 by fixing the battery module in the box assembly 21 .

[0062] As an example, the battery cell assembly may also be accommodated in the box assembly 21 by directly fixing a plurality of battery cells to the box assembly 21 .

[0063] As an example, see Figure 2 The box assembly 21 may include a first box 211 and a second box 212. The first box 211 and the second box 212 are buckled together to form a closed space inside the box assembly 21 to accommodate the battery monomer assembly. The closed space here means covering or closing, which can be sealed or unsealed. The first box 211 can be a top cover or a bottom plate.

[0064] As an example, the box assembly 21 may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box to accommodate the battery monomer assembly.

[0065] In some embodiments, the box assembly 21 can be used as part of the chassis structure of the vehicle 3. For example, part of the box assembly 21 can become at least part of the floor of the vehicle 3, or part of the box assembly 21 can become at least part of the cross beam and longitudinal beam of the vehicle 3.

[0066] Please refer to Figure 3 , Figure 4 and Figure 5 The first plate portion 111 and the second plate portion 112 are stacked. It can be understood that the stacking direction of the first plate portion 111 and the second plate portion 112 is the thickness direction of the two.

[0067] When the buffer structure 11 is disposed on the box assembly 21 to be protected, the buffer structure 11 is disposed on the box assembly 21 along the thickness direction, that is, the stacking direction of the first plate portion 111 and the second plate portion 112. When the box assembly 21 is impacted by an external force, the direction of the external force is parallel to the stacking direction or in a direction at an acute angle to the stacking direction.

[0068] Here, the first plate portion 111 is a plate structure. Exemplarily, the first plate portion 111 is a metal plate, for example.

[0069] Here, the second plate portion 112 is a plate structure. Exemplarily, the second plate portion 112 is a metal plate, for example.

[0070] An installation space 11a is defined between the first plate portion 111 and the second plate portion 112. Therefore, the first plate portion 111 and the second plate portion 112 are concave or convex along the stacking direction to form the installation space 11a, which enables the side plate of the installation space 11a to deform smoothly when impacted by an external force, which can absorb a certain impact energy on the one hand, and provide a certain deformation space for the buffer structure 11 on the other hand, so as to improve the protective effect of the buffer structure 11.

[0071] The buffer unit is filled in the installation space 11 a and is used to absorb a certain impact energy when the box assembly 21 is hit, that is, it can improve the energy absorption effect of the box assembly 21 when it is hit.

[0072] Since the hollow buffer body 113 has a buffer cavity 113a inside, the hollow buffer body 113 can have good deformation ability, can absorb impact energy during deformation after collision, and can provide deformation space for the buffer structure 11, which is beneficial to further reduce the degree of damage to the battery cell assembly after the box assembly 21 collides.

[0073] In the battery device 10 provided in the embodiment of the present application, the battery cell assembly is arranged in the accommodating space of the box assembly 21, and the box assembly 21 protects the battery cell assembly. On the one hand, the installation space 11a formed by the first plate portion 111 and the second plate portion 112 can absorb impact energy during deformation after a collision, and can provide deformation space for the box assembly 21; on the other hand, a buffer unit is filled in the installation space 11a, and a plurality of hollow buffer bodies 113 can absorb a certain amount of impact energy to improve the energy absorption performance of the box assembly 21 when it is hit, which is beneficial to reduce the degree of damage to the battery cell assembly inside the box assembly 21 after a collision impact, thereby improving the impact resistance of the battery device 10.

[0074] It should be noted that, in the embodiments of the present application, a plurality refers to a number of two or more.

[0075] In some embodiments, please refer to Figure 5 and Figure 6 , the buffer cavity 113a is a closed cavity. It is understandable that the hollow buffer body 113 is a hollow structure, and the hollow buffer body 113 can be compressed by an external force toward the buffer cavity 113a, so that the hollow buffer body 113 has a certain deformation ability, can absorb the impact energy during the deformation of the box assembly 21 after the collision, and can also provide deformation space for the buffer structure 11, which is conducive to further reducing the degree of damage to the battery assembly caused by the box assembly 21 after the collision.

[0076] It should be noted that the specific shape of the buffer cavity 113a is not limited.

[0077] The shape of the hollow buffer body 113 may be a sphere, an ellipsoid, a cube, or other regular or irregular shapes.

[0078] In some embodiments, please refer to Figure 5 and Figure 6 The hollow buffer body 113 is in a hollow spherical or spherical cap shape. It is understandable that the spherical or spherical cap shape is convenient for stamping and forming, which is beneficial to the production of the hollow buffer body 113 and improves production efficiency.

[0079] It should be noted that the spherical cap shape refers to the part obtained by cutting a sphere by the plane 113c.

[0080] It should be noted that the sizes of the hollow buffer bodies 113 may be the same or different; the shapes of the hollow buffer bodies 113 may be the same or different.

[0081] In some embodiments, please refer to Figure 6 The thickness H of the wall of the buffer cavity 113a is 0.05 mm to 0.3 mm, for example, 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.14 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.30 mm, etc.

[0082] Different impact resistance capabilities can be obtained according to the wall thickness of the buffer cavity 113a of the hollow buffer body 113, so that the buffer structure 11 has different impact resistance performance and energy absorption effect.

[0083] In this embodiment, by setting the thickness of the cavity wall of the buffer cavity 113a of the hollow buffer body 113 to 0.05 mm to 0.3 mm, the buffer structure 11 can have good impact resistance and energy absorption effect.

[0084] In some embodiments, please refer to Figure 6 The diameter L of the hollow buffer body 113 is 1 mm to 10 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0085] It can be understood that when the two hollow buffer bodies 113 are arranged in abutment, the gap formed between the spherical surfaces 113b of the two hollow buffer bodies 113 will be affected by the diameter of the hollow buffer body 113, and the gap between the two can provide space for the deformation of the two hollow buffer bodies 113 after collision, and can absorb a certain impact energy. Therefore, different porosities can be obtained according to the diameter of the hollow buffer body 113, so that the buffer structure 11 has different impact resistance and energy absorption effects.

[0086] In this embodiment, by setting the diameter L of the hollow buffer body 113 to 1 mm-10 mm, the buffer structure 11 can have better impact resistance and energy absorption effect.

[0087] It should be noted that the specific type of the hollow buffer body 113 is not limited.

[0088] In some embodiments, the hollow buffer body 113 is a steel part, an aluminum part or a non-metal part.

[0089] In the above technical solution, the hollow buffer body 113 includes the following types: the first type, the hollow buffer body 113 is a steel part; the second type, the hollow buffer body 113 is an aluminum part; the third type, the hollow buffer body 113 is a non-metallic part.

[0090] It should be noted that each hollow buffer body 113 can be a steel part, an aluminum part, or a non-metallic part. There can also be hollow buffer bodies 113 made of steel parts, hollow buffer bodies 113 made of aluminum parts, and hollow buffer bodies 113 made of non-metallic parts.

[0091] In this embodiment, the hollow buffer body 113 made of steel has a relatively large structural strength and has good impact resistance and energy absorption effect.

[0092] In this example, the hollow buffer body 113 of the aluminum part has a relatively low density, which is beneficial to reducing the weight of the box assembly 21 and the weight of the battery device 10 .

[0093] In this example, the non-metal hollow buffer body 113 has low electrical conductivity and thermal conductivity, which is beneficial for blocking the path of heat and current transfer from the battery device 10 to the outside, thereby improving the safety of the battery device 10 .

[0094] In some embodiments, the hollow buffer body 113 includes a first half shell (not shown in the figure) and a second half shell (not shown in the figure). The first half shell and the second half shell are split structures, and the first half shell and the second half shell are interconnected and enclosed to form a buffer cavity 113a.

[0095] In this example, by setting the hollow buffer body 113 as a split structure, the first half shell and the second half shell can be produced separately, which can increase the production speed, facilitate the mass production of the hollow buffer body 113, and improve the production efficiency.

[0096] Exemplarily, the first half shell and the second half shell are formed by stamping, so that it is easy to control the thickness of the first half shell and the second half shell, so that the buffer cavity 113a formed by the two has a suitable cavity wall thickness, thereby improving the energy absorption effect of the hollow buffer body 113.

[0097] In some embodiments, the buffer unit includes an adhesive, and the adhesive is used to bond the hollow buffer body 113 to the first plate portion 111 and / or the second plate portion 112 .

[0098] The above technical solutions include the following: first, an adhesive is used to bond the hollow buffer body 113 to the first plate portion 111; second, an adhesive is used to bond the hollow buffer body 113 to the second plate portion 112; third, an adhesive is used to bond the hollow buffer body 113 to the first plate portion 111 and the second plate portion 112 respectively.

[0099] It can be understood that the adhesive can establish a connection relationship between the hollow buffer body 113 and the first plate portion 111 and / or the second plate portion 112, which can reduce the shaking of the hollow buffer body 113 during the transportation or use of the battery device 10, and can reduce the sound of the battery device 10 caused by the collision between the hollow buffer body 113 and the first plate portion 111 and / or the second plate portion 112. In addition, it can also facilitate the assembly of the buffer structure 11 and improve the assembly efficiency of the buffer structure 11.

[0100] In some embodiments, please refer to Figure 5 In an embodiment where the hollow buffer body 113 is in a hollow spherical crown shape, the outer surface of the hollow buffer body 113 includes a spherical surface 113b and a plane 113c, and the multiple hollow buffer bodies 113 include multiple first hemispheres 1131 and multiple second hemispheres 1132. The plane 113c of the first hemisphere 1131 faces the first plate portion 111, and the plane 113c of the second hemisphere 1132 faces the second plate portion 112, and in the orthographic projection of the plane 113c parallel to the first plate portion 111 and / or the second plate portion 112, the first hemispheres 1131 and the second hemispheres 1132 are arranged alternately.

[0101] It should be noted that the spherical surfaces 113 b of the adjacent first hemisphere 1131 and second hemisphere 1132 face opposite directions, that is, the spherical surface 113 b of the first hemisphere 1131 faces the second plate portion 112 , and the spherical surface 113 b of the second hemisphere 1132 faces the first plate portion 111 .

[0102] In the orthographic projection of the plane 113c parallel to the first plate portion 111 and / or the second plate portion 112, the first hemispheres 1131 and the second hemispheres 1132 are arranged alternately, which means that in the orthographic projection of the plane 113c parallel to the first plate portion 111 and / or the second plate portion 112, the projection of the second hemisphere 1132 is located between two adjacent first hemispheres 1131.

[0103] That is to say, the first hemisphere 1131 is arranged at intervals, and the second hemisphere 1132 is also arranged at intervals, and the spherical surface 113b of the second hemisphere 1132 is located in the interval formed by the two adjacent first hemispheres 1131. Since the spherical surfaces 113b of the adjacent first hemisphere 1131 and the second hemisphere 1132 face in opposite directions, when the box assembly 21 is collided, the first hemisphere 1131 and the second hemisphere 1132 will deform toward each other under the action of external force, and the spherical surfaces 113b of the adjacent first hemisphere 1131 and the second hemisphere 1132 will abut, so that the adjacent first hemisphere 1131 and the second hemisphere 1132 can disperse the force applied to them along the spherical surface 113b, thereby improving the energy absorption effect of the first hemisphere 1131 and the second hemisphere 1132.

[0104] In this embodiment, by alternating the first hemisphere 1131 and the second hemisphere 1132, the first hemisphere 1131 transfers force to the adjacent second hemisphere 1132 when deformed by force, and can absorb impact energy during deformation after collision, thereby improving the energy absorption effect of the box assembly 21 when impacted.

[0105] It should be noted that, in the orthographic projection of the plane 113c parallel to the first plate portion 111 and / or the second plate portion 112, the specific shape formed by the alternating arrangement of the first hemisphere 1131 and the second hemisphere 1132 is not limited, for example, it can be roughly rectangular, roughly irregular polygonal, or roughly curved.

[0106] In some embodiments, the buffer cavity 113 a is filled with foaming material and / or phase change material.

[0107] Foam material is a microporous material based on polymer (such as plastic, rubber, elastomer or natural polymer material) with a large number of bubbles inside. This material can be regarded as a composite material with gas as filler, which has a wide range of uses and various classifications.

[0108] Phase change materials refer to materials that change their state and provide latent heat without changing the temperature. For example, the process of phase change materials changing from solid to liquid absorbs a large amount of heat.

[0109] The above technical solutions include the following: first, the buffer cavity 113a is filled with foaming material; second, the buffer cavity 113a is filled with phase change material; third, the buffer cavity 113a is filled with foaming material and phase change material.

[0110] In this embodiment, the foam material can reduce the force and disperse it to the wall of the buffer cavity 113a when deformed by force, and can absorb impact energy during deformation after collision, thereby improving the energy absorption effect of the box assembly 21 when impacted.

[0111] In this embodiment, the filled phase change material can absorb or release heat in the process of changing the state of the material, which can improve the thermal insulation performance of the box assembly 21.

[0112] In some embodiments, the box assembly 21 includes a box and an expansion beam (not shown in the figure), the box defines a receiving space, and the expansion beam is disposed in the receiving space and connected to the box. The buffer structure 11 is configured as a part of the box, and / or the buffer structure 11 is configured as at least a part of the expansion beam.

[0113] It should be noted that the above-mentioned box body may be the second box body 212 in the embodiment of the first box body 211 and the second box body 212 .

[0114] The above technical solutions include the following: first, the buffer structure 11 is constructed as a part of the box body; second, the buffer structure 11 is constructed as at least a part of the expansion beam; third, the buffer structure 11 is constructed as a part of the box body, and the buffer structure 11 is constructed as at least a part of the expansion beam.

[0115] In this embodiment, the buffer structure 11 is constructed as a part of the box body. When the box body assembly 21 is hit, the buffer structure 11 can absorb a certain impact energy during the deformation process after the collision, thereby improving the impact resistance and energy absorption effect of the box body and reducing the impact energy transmitted to the inside of the box body, so as to reduce the degree of damage to the battery cell assembly after the collision impact.

[0116] In this embodiment, the buffer structure 11 is constructed as at least a part of the expansion beam, which is located in the accommodating space of the box body and is used to limit the expansion of the battery cell assembly. When the box body assembly 21 is collided, the box body transfers impact energy to the accommodating space. The buffer structure 11 in the expansion beam can absorb a certain amount of impact energy, thereby improving the impact resistance and energy absorption effect of the expansion beam, thereby reducing the impact energy transferred to the battery cell assembly and reducing the damage to the battery cell assembly after the box body assembly 21 expands.

[0117] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0118] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or at least two embodiments or examples in a suitable manner. In addition, those skilled in the art may combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0119] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A box assembly having a receiving space; A battery cell assembly is arranged in the accommodation space; The box assembly includes a buffer structure, the buffer structure includes a first plate portion, a second plate portion and a buffer unit, the first plate portion and the second plate portion are stacked and define an installation space therebetween; The buffer unit is filled in the installation space, and the buffer unit includes a plurality of hollow buffer bodies, and a buffer cavity is formed inside the hollow buffer body; Wherein, the buffer cavity is a closed cavity.

2. The battery device according to claim 1, characterized in that: The buffer unit includes an adhesive, and the adhesive is used to bond the hollow buffer body to the first plate portion and / or the second plate portion.

3. The battery device according to claim 1, characterized in that: The hollow buffer body includes a first half shell and a second half shell, the first half shell and the second half shell are split structures, and the first half shell and the second half shell are connected to each other and enclose to form the buffer cavity.

4. The battery device according to claim 1, characterized in that: The hollow buffer body is a steel part, an aluminum part or a non-metal part.

5. The battery device according to claim 1, characterized in that: The hollow buffer body is in the shape of a hollow sphere or a spherical crown.

6. The battery device according to claim 5, characterized in that: The thickness of the cavity wall of the buffer cavity is 0.05 mm to 0.3 mm.

7. The battery device according to claim 5, characterized in that: The diameter of the hollow buffer body is 1 mm to 10 mm.

8. The battery device according to claim 1, characterized in that: The hollow buffer body is in the shape of a hollow spherical crown, and the outer surface of the hollow buffer body includes a spherical surface and a plane. The multiple hollow buffer bodies include multiple first hemispheres and multiple second hemispheres. The plane of the first hemisphere faces the first plate portion, and the plane of the second hemisphere faces the second plate portion. In the plane projection parallel to the first plate portion and / or the second plate portion, the first hemisphere and the second hemisphere are arranged alternately.

9. The battery device according to any one of claims 1 to 8, characterized in that: The buffer cavity is filled with foaming material and / or phase change material.

10. The battery device according to any one of claims 1 to 8, characterized in that: The box assembly includes a box and an expansion beam, the box defines the accommodation space, and the expansion beam is arranged in the accommodation space and connected to the box; Wherein, the buffer structure is constructed as a part of the box body, and / or the buffer structure is constructed as at least a part of the expansion beam.

11. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 10, wherein the battery device is used to provide electrical energy.

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