Box assembly, battery and electric device

Abstract

The utility model relates to a box assembly, a battery and an electric device. The box assembly comprises a box body; the heat exchange bottom plate is located on the bottom side of the box body, the heat exchange bottom plate comprises a main body and a plurality of protrusion sets arranged in the circumferential direction of the main body at intervals, each protrusion set comprises at least one protrusion, and the protrusions protrude out of the side periphery of the main body; wherein the main body is connected with the box body through all the bulges. According to the box assembly, the battery and the power utilization device, the temperature difference can be reduced, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a box assembly, a battery and an electric device. BACKGROUND

[0002] In recent years, the new energy industry has been getting more and more attention. As an important part of the new energy industry, batteries account for a large share in the market.

[0003] The battery includes a box assembly and a plurality of battery monomers. The box assembly includes a box body and a heat exchange bottom plate. The battery monomers are located in the box body and supported on the heat exchange bottom plate. In order to ensure the normal operation of the battery, the heat exchange bottom plate is used to heat exchange with the battery monomers according to the current working condition, so as to realize the heating or cooling of the battery monomers.

[0004] The heat exchange bottom plate and the box body themselves have high thermal conductivity. In a low temperature working condition, the heat of the edge region of the heat exchange bottom plate in contact with the box body can be directly or indirectly diffused into the cold air of the external environment through the box body, and the temperature of the edge region of the heat exchange bottom plate is greatly reduced. The main body region of the heat exchange bottom plate in the edge region has a small temperature drop due to the lack of heat conduction of the box body. In this case, the temperature of the battery monomers close to or in contact with the edge region of the heat exchange bottom plate and the temperature of the battery monomers in contact with the center position of the main body region of the heat exchange bottom plate form a temperature difference. The large temperature difference reduces the cycle life of the battery. CONTENT OF THE UTILITY MODEL

[0005] Therefore, it is necessary to provide a box assembly, a battery and an electric device capable of reducing the temperature difference and prolonging the service life in view of the above problems.

[0006] A box assembly, characterized in that the box assembly comprises:

[0007] a box body; and

[0008] a heat exchange bottom plate located at the bottom side of the box body, the heat exchange bottom plate comprising a main body and a plurality of groups of protrusions spaced along the circumference of the main body, each group of protrusions comprising at least one protrusion protruding from the side periphery of the main body;

[0009] The main body is connected to the box body by all the protrusions.

[0010] In some embodiments, the side periphery comprises a first side edge and a second side edge connected to each other, the first side edge extending along the length direction of the main body, and the second side edge extending along the width direction of the main body; the first side edge and the second side edge are both provided with a group of protrusions at the center position along the extending direction of itself and at the corner connected to each other.

[0011] In some embodiments, the plurality of protrusions in the protrusion group are continuous.

[0012] In some embodiments, the protrusion group at the center of the first side edge is a first protrusion group, and the protrusion group at the center of the second side edge is a second protrusion group, wherein the number of protrusions in the first protrusion group is greater than the number of protrusions in the second protrusion group.

[0013] In some embodiments, the heat insulation member is further provided.

[0014] The gap between each adjacent protrusion group is filled with at least one heat insulation member, and all the heat insulation members and all the protrusions are in sealed connection with the box.

[0015] In some embodiments, a bottom guard plate is further provided, which is arranged on the bottom side of the heat exchange bottom plate opposite to the box and is connected with the heat exchange bottom plate and the box.

[0016] In some embodiments, the bottom side of the bottom guard plate opposite to the heat exchange bottom plate is provided with a reinforcing structure corresponding to each protrusion.

[0017] In some embodiments, a buffer material is filled between the heat exchange bottom plate and the bottom guard plate, and / or a heat insulation layer is coated on the surface of the heat exchange bottom plate facing the bottom guard plate.

[0018] A battery comprising:

[0019] The box assembly according to any one of the preceding embodiments; and

[0020] A plurality of battery cells are arranged in the box and supported by the heat exchange bottom plate.

[0021] A power consumption device comprising the battery according to the preceding embodiments.

[0022] The box assembly, the battery and the electric device, all the protrusions form the edge area of the heat exchange bottom plate and are directly contacted and connected with the box body, the main body forms the main body area of the heat exchange bottom plate and is connected with the box body through the edge area. In the present application, since the protrusion groups are arranged at intervals along the circumference of the main body, compared with the prior art in which the edge area is continuously arranged around the main body area and directly contacted with the box body, the area of the edge area of the heat exchange bottom plate directly contacted with the box body is reduced in the present application, thereby reducing the influence of the temperature drop of the box body on the heat exchange bottom plate under low temperature working condition. The battery monomer arranged in the area close to the edge area of the heat exchange bottom plate in the main body area or arranged in the edge area has smaller temperature difference with the battery monomer arranged at the center position of the main body area of the heat exchange bottom plate, thereby prolonging the service life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the box assembly in an embodiment of the present application;

[0024] Figure 2 It is an enlarged schematic diagram of the local structure A in the box assembly shown in Figure 1

[0025] Figure 3 It is an enlarged schematic diagram of the local structure B in the box assembly shown in Figure 1

[0026] Figure 4 It is an exploded view of the box assembly shown in Figure 1

[0027] Figure 5 It is a structural schematic diagram of the heat exchange bottom plate in the box assembly shown in Figure 4

[0028] REFERENCE SIGNS:

[0029] 1000, box assembly;

[0030] 100, heat exchange bottom plate; 200, box body; 300, heat insulation member; 400, bottom guard plate;

[0031] 10, main body; 11, first side edge; 12, second side edge; 20, protrusion group; 20a, first protrusion group; 20b, second protrusion group; 20c, third protrusion group; 21, protrusion; 40, reinforcing structure. DETAILED DESCRIPTION

[0032] ​​​​In order to make the above objectives, features and advantages of the present application more clear and understandable, the detailed description of the embodiments of the present application is made below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in many different ways from what is described herein, and should not be construed as being limited to the embodiments set forth herein, but should be understood to include all possible embodiments that can be made within the scope of the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implying the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] It is to be understood that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that, when a member is referred to as being "coupled" or "connected" to another member, it can be directly coupled or connected to the other member or intervening members can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to the electric vehicles such as electric bicycle, electric motorcycle, electric automobile and the military equipment and aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0039] The battery comprises a box assembly and a plurality of battery monomers. The box assembly comprises a box body and a heat exchange bottom plate. The battery monomers are located in the box body and supported on the heat exchange bottom plate. In order to ensure the normal operation of the battery, the heat exchange bottom plate is used to exchange heat with the battery monomers according to the current working condition, so as to realize the heating or cooling of the battery monomers.

[0040] The heat exchange bottom plate and the box body itself have high thermal conductivity. In the low temperature working condition, the heat of the edge area of the heat exchange bottom plate in contact with the box body can be directly or indirectly diffused to the cold air of the external environment through the box body, and the temperature of the edge area of the heat exchange bottom plate is greatly reduced. The main body area of the heat exchange bottom plate in the edge area has relatively small temperature drop due to the lack of heat conduction of the box body. In this case, the battery monomers arranged in the area close to the edge area of the heat exchange bottom plate in the main body area or arranged in the edge area form a temperature difference with the battery monomers arranged at the center position of the main body area of the heat exchange bottom plate. The large temperature difference will reduce the cycle life of the battery.

[0041] Please refer to Figures 1 to 5 In order to alleviate the above problems, the application provides a box assembly 1000, which comprises a box body 200 and a heat exchange bottom plate 100. The heat exchange bottom plate 100 is located at the bottom side of the box body 200. The heat exchange bottom plate 100 comprises a main body 10 and a plurality of groups of protrusions 20 arranged along the circumference of the main body 10. Each group of protrusions 20 comprises at least one protrusion 21. The protrusion 21 protrudes from the side circumference of the main body 10. The main body 10 is connected to the box body 200 through all the protrusions 21.

[0042] In some embodiments, the box 200 is only open at the bottom side, the heat exchange bottom plate 100 closes the opening of the bottom side of the box 200, and the heat exchange bottom plate 100 and the box 200 together define a containing cavity for containing the battery cells. In some embodiments, the box 200 is open at both the bottom side and the top side, the box assembly 1000 further comprises a box cover, the heat exchange bottom plate 100 closes the opening of the bottom side of the box 200, the box cover closes the opening of the top side of the box 200, and the heat exchange bottom plate 100, the box 200 and the box cover together define a containing cavity for containing the battery cells.

[0043] The heat exchange bottom plate 100 is internally provided with a heat exchange flow channel for circulating a heat exchange medium, which can be water, alcohol or other liquid with large specific heat. In a high-temperature working condition, the heat exchange medium flows in the heat exchange flow channel and absorbs the heat of the battery cells to cool the battery cells; in a low-temperature working condition, the heat exchange medium flows in the heat exchange flow channel and releases heat to the battery cells to heat the battery cells.

[0044] The heat exchange bottom plate 100 comprises a main body 10 and a plurality of groups of protrusions 20, the main body 10 is mainly used for supporting the battery cells, and the main body 10 does not contact the box 200, the plurality of groups of protrusions 20 are arranged at intervals along the circumference of the main body 10, and each group of protrusions 20 comprises at least one protrusion 21, the protrusion 21 protrudes from the side circumference of the main body 10, but the top surface of the protrusion 21 is flush with the top surface of the main body 10, and the bottom surface of the protrusion 21 is flush with the bottom surface of the main body 10. All the protrusions 21 are connected to the box 200 by sealing glue, friction welding or screws.

[0045] It can be understood that in the present application, all the protrusions 21 form the edge region of the heat exchange bottom plate 100 and directly contact and connect with the box 200, and the main body 10 forms the main body region of the heat exchange bottom plate 100 and is connected to the box 200 through the edge region. In the present application, since the groups of protrusions 20 are arranged at intervals along the circumference of the main body 10, compared with the prior art in which the edge region surrounding the main body region is continuously arranged and directly contacts the box 200, the area of direct contact between the edge region of the heat exchange bottom plate 100 and the box 200 is reduced in the present application, thereby reducing the temperature drop of the heat exchange bottom plate 100 caused by the box 200 in a low-temperature working condition, and the temperature difference between the battery cells arranged in the region close to the edge region of the heat exchange bottom plate 100 in the main body region or in the edge region and the battery cells arranged at the center position of the main body region of the heat exchange bottom plate 100 is small, thereby prolonging the service life of the battery.

[0046] In some embodiments, the side periphery comprises a first side edge 11 and a second side edge 12 connected to each other, the first side edge 11 extending along the length direction of the main body 10, and the second side edge 12 extending along the width direction of the main body 10; the first side edge 11 and the second side edge 12 are both provided with a protrusion group 20 at the center position arranged along the extending direction of the first side edge 11 and the second side edge 12, and at the corner where the first side edge 11 and the second side edge 12 are connected to each other.

[0047] The main body 10 of the heat exchange bottom plate 100 is a rectangular surface, and has two first side edges 11 and two second side edges 12, the first side edges 11 and the second side edges 12 are arranged alternately and connected end to end. The bottom surface of the box body 200 is a rectangular frame, and has two long sides and two short sides, the two first side edges 11 correspond to the two long sides one by one, and the two second side edges 12 correspond to the two short sides one by one, the protrusion group 20 on the first side edge 11 is connected to the corresponding long side, and the protrusion group 20 on the second side edge 12 is connected to the corresponding short side.

[0048] Each first side edge 11 is provided with a protrusion group 20 at the center position arranged along the extending direction of the first side edge 11, each second side edge 12 is provided with a protrusion group 20 at the center position arranged along the extending direction of the second side edge 12, and each corner is provided with a protrusion group 20.

[0049] In the embodiment, by designing the first side edge 11 and the second side edge 12 to be provided with a protrusion group 20 at the center position arranged along the extending direction of the first side edge 11 and the second side edge 12, and at the corner where the first side edge 11 and the second side edge 12 are connected to each other, all the protrusions 21 are matched to support and connect the middle and both ends of each side of the bottom surface of the box body 200, which is beneficial to improve the reliability and stability of the installation of the heat exchange bottom plate 100 and the box body 200.

[0050] In some embodiments, the protrusions 21 in the protrusion group 20 are multiple and arranged continuously, so that all the protrusions 21 in the same protrusion group 20 are arranged closely, the structure of the protrusion group 20 is more stable, the mechanical strength is better, and the box body 200 is not easy to deform when being supported.

[0051] In some embodiments, the protrusion groups 20 arranged at the center position of the first side edge 11 along the extending direction of the first side edge 11 are defined as the first protrusion groups 20a, the protrusion groups 20 arranged at the center position of the second side edge 12 along the extending direction of the second side edge 12 are defined as the second protrusion groups 20b, and the number of the protrusions 21 in the first protrusion groups 20a is greater than the number of the protrusions 21 in the second protrusion groups 20b. Generally, in the process of supporting the box body 200, the weight borne by the protrusion groups 20 on the first side edge 11 is greater than the weight borne by the protrusion groups 20 on the second side edge 12, and thus the mechanical strength of the protrusion groups 20 on the first side edge 11 should also be greater than the mechanical strength of the protrusion groups 20 on the second side edge 12. By designing the number of the protrusions 21 in the first protrusion groups 20a to be greater than the number of the protrusions 21 in the second protrusion groups 20b, the mechanical strength of the protrusion groups 20 on the first side edge 11 and the second side edge 12 can be ensured to be better, so that the protrusion groups 20 on the first side edge 11 and the second side edge 12 are less likely to deform, and at the same time, the number of the protrusions 21 in the second protrusion groups 20b is reduced, which is conducive to simplifying the manufacturing difficulty of the heat exchange bottom plate 100 and reducing the production cost and production efficiency.

[0052] The protrusion groups 20 arranged at the corners are defined as the third protrusion groups 20c, the number of the protrusions 21 in the first protrusion groups 20a is less than the number of the protrusions 21 in the first protrusion groups 20a and equal to the number of the protrusions 21 in the second protrusion groups 20b. This design can ensure the mechanical strength of the protrusion groups 20 at the corners while simplifying the manufacturing difficulty of the heat exchange bottom plate 100.

[0053] In some embodiments, the box assembly 1000 further comprises a plurality of thermal insulation pieces 300; at least one thermal insulation piece 300 is filled in the gap between each adjacent two groups of protrusion groups 20; all the thermal insulation pieces 300 and all the protrusions 21 are in sealed connection with the box body 200.

[0054] The top surface of the thermal insulation piece 300 is flush with the top surface of the protrusion 21, and the bottom surface of the thermal insulation piece 300 is flush with the bottom surface of the protrusion 21. The thermal insulation piece 300 is filled between each adjacent two groups of protrusion groups 20. On the one hand, all the thermal insulation pieces 300 and all the protrusion groups 20 can jointly support the box body 200 to improve the strength, and on the other hand, the thermal insulation piece 300 can also seal and insulate the edges of the heat exchange bottom plate 100, so as to ensure that the temperature difference between the battery monomers arranged in the main body area and the battery monomers arranged in the edge area is not too large under low-temperature working conditions, which is conducive to prolonging the service life of the battery.

[0055] As an example, the thermal insulation member 300 is preferably made of a thermal insulation material with certain mechanical strength, such as carbon fiber thermal insulation material, rubber thermal insulation material, etc. All the thermal insulation members 300 and all the protrusions 21 can be sealed and connected to the box body 200 by a sealant with low thermal conductivity, so as to avoid forming a thermal bridge and to block the heat conduction between the protrusion group 20 and the box body 200 as much as possible.

[0056] In some embodiments, the box assembly 1000 further comprises a bottom guard plate 400, which is arranged on the bottom side of the heat exchange bottom plate 100 facing away from the box body 200 and is connected to the heat exchange bottom plate 100 and the box body 200.

[0057] The heat exchange bottom plate 100 and the bottom guard plate 400 are arranged in a stack, and the heat exchange bottom plate 100 is completely covered by the bottom guard plate 400. In addition, the mechanical strength of the bottom guard plate 400 is greater than that of the heat exchange bottom plate 100. In the height direction of the box body 200, the weight of all the battery monomers arranged in the box body 200 is mainly borne by the bottom guard plate 400. The arrangement of the bottom guard plate 400 can support and protect the heat exchange bottom plate 100, so as to avoid deformation of the heat exchange bottom plate 100 due to compression by the battery monomers or external impact, resulting in poor flow of the heat exchange medium in the heat exchange bottom plate 100.

[0058] In some embodiments, the bottom side of the bottom guard plate 400 facing away from the heat exchange bottom plate 100 is provided with a reinforcing structure 40 corresponding to each protrusion 21. The reinforcing structure 40 is aligned with the thermal insulation gap in the height direction of the box body 200. It can be understood that the reinforcing structure 40 is aligned with the thermal insulation gap in the height direction of the box body 200 means that the reinforcing structure 40 and the thermal insulation gap at least partially overlap in the orthographic projection in the height direction of the box body 200.

[0059] The position corresponding to the same protrusion 21 can be provided with one or more reinforcing structures 40, which can be set according to requirements.

[0060] As an example, the reinforcing structure 40 can be a reinforcing plate, a reinforcing table, a reinforcing protrusion 21, etc., which will not be described here. The reinforcing structure 40 can improve the mechanical strength of the bottom guard plate 400 to make up for the part of the structural strength sacrificed by the heat exchange bottom plate 100 to block the heat transfer with the box body 200. In this way, in the height direction of the box body 200, the weight of the battery monomers is mainly borne by the bottom guard plate 400, so as to improve the overall structural strength of the heat exchange bottom plate 100 and the bottom guard plate 400.

[0061] Further, in some embodiments, a buffer material is filled between the heat exchange bottom plate 100 and the bottom guard plate 400; and / or a thermal insulation layer is coated on the surface of the heat exchange bottom plate 100 facing the bottom guard plate 400.

[0062] Specifically, the buffer material can be foam, plastic, etc. The heat insulation layer can be a PVC (polyvinyl chloride) coating, a composite magnesium aluminum silicate coating, etc., which can be selected according to requirements.

[0063] For example, the buffer material filled between the heat exchange bottom plate 100 and the bottom guard plate 400 provides buffering and force support for the heat exchange bottom plate 100, preventing the heat exchange bottom plate 100 from deforming outwardly. In addition, the buffer material usually also has a heat insulation effect, which can enhance safety while also improving the heat preservation effect of the heat exchange bottom plate 100 by using the low thermal conductivity of the buffer material to adapt to low temperature working conditions.

[0064] For example, the heat insulation layer coated on the surface of the heat exchange bottom plate 100 facing the bottom guard plate 400 can reduce the heat conduction speed of the heat exchange bottom plate 100 to the bottom guard plate 400, which is beneficial to improving the heat preservation effect of the heat exchange bottom plate 100.

[0065] The application also provides a battery comprising a plurality of battery monomers and the box assembly 1000 according to any one of the above embodiments. All battery monomers are arranged in the box body 200 and supported on the heat exchange bottom plate 100. Specifically, all battery monomers are supported on the main body 10. The battery in the application has the effects brought by any one of the above embodiments, which will not be repeated here.

[0066] The application also provides an electric device comprising the battery according to the above embodiments. The electric device in the application has the effects brought by any one of the above embodiments, which will not be repeated here.

[0067] The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0068] It should be understood that the technical solutions described in the embodiments of the application are not limited to the above described electric devices.

[0069] The box assembly 1000, the battery and the electric device, all the protrusions 21 form the edge area of the heat exchange bottom plate 100 and are directly contacted and connected with the box body 200, the main body 10 forms the main body area of the heat exchange bottom plate 100 and is connected with the box body 200 through the edge area. In the present application, since the protrusion groups 20 are arranged at intervals along the circumference of the main body 10, compared with the prior art in which the edge area surrounding the main body area is continuously arranged for one turn and is directly contacted with the box body 200, the area of the edge area of the heat exchange bottom plate 100 directly contacted with the box body 200 is reduced in the present application, thereby reducing the influence of the box body 200 on the temperature drop of the heat exchange bottom plate 100 under low-temperature working conditions. The battery monomer arranged in the area close to the edge area of the heat exchange bottom plate 100 in the main body area or arranged in the edge area has a smaller temperature difference with the battery monomer arranged at the center position of the main body area of the heat exchange bottom plate 100, thereby prolonging the service life of the battery.

[0070] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0071] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A box assembly, characterized in that, The box assembly includes: Box (200); and A heat exchange base plate (100) is located on the bottom side of the housing (200). The heat exchange base plate (100) includes a main body (10) and a plurality of protrusion groups (20) arranged circumferentially along the main body (10). Each protrusion group (20) includes at least one protrusion (21), which protrudes from the side periphery of the main body (10). The main body (10) is connected to the box (200) through all the protrusions (21).

2. The box assembly according to claim 1, characterized in that, The side perimeter includes a first side edge (11) and a second side edge (12) connected together. The first side edge (11) extends along the length direction of the main body (10), and the second side edge (12) extends along the width direction of the main body (10). The protrusion group (20) is provided at the center position of the first side edge (11) and the second side edge (12) along their own extension direction, and at the corner where the first side edge (11) and the second side edge (12) are connected.

3. The box assembly according to claim 2, characterized in that, The protrusions (21) in the protrusion group (20) are multiple and arranged continuously.

4. The box assembly according to claim 3, characterized in that, The protrusion group (20) located at the center position of the first side edge (11) along its own extension direction is defined as the first protrusion group (20a), and the protrusion group (20) located at the center position of the second side edge (12) along its own extension direction is defined as the second protrusion group (20b). The number of protrusions (21) in the first protrusion group (20a) is greater than the number of protrusions (21) in the second protrusion group (20b).

5. The box assembly according to claim 1, characterized in that, It also includes multiple insulation components (300); At least one of the heat insulation elements (300) is filled in the gap between each pair of adjacent groups of protrusions (20); all the heat insulation elements (300) and all the protrusions (21) are sealed to the housing (200).

6. The box assembly according to claim 1, characterized in that, It also includes a bottom guard plate (400), which is disposed on the bottom side of the heat exchange base plate (100) facing away from the box body (200) and is connected to the heat exchange base plate (100) and the box body (200).

7. The box assembly according to claim 6, characterized in that, The bottom guard plate (400) faces away from the bottom side of the heat exchange bottom plate (100), and a reinforcing structure (40) is provided at the position corresponding to each of the protrusions (21).

8. The box assembly according to claim 7, characterized in that, A cushioning material is filled between the heat exchange base plate (100) and the bottom guard plate (400); and / or, a heat insulation layer is coated on the surface of the heat exchange base plate (100) facing the bottom guard plate (400).

9. A battery, characterized in that, include: The box assembly as described in any one of claims 1 to 8 above; as well as Multiple battery cells are disposed inside the housing (200) and supported on the heat exchange base plate (100).

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9 above.

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