Case body assembly, battery and electrical apparatus

Abstract

A case body assembly (100), a battery (200) and an electrical apparatus (1000). The case body assembly (100) comprises a case body (1) and a first heat exchange member (2); the case body (1) is internally provided with an accommodation cavity (1a) used for accommodating battery cells (101), and comprises a first case wall (13) and second case walls (14) participating in defining the accommodation cavity (1a), the first case wall (13) and the second case walls (14) being separate parts; end portions of the first case wall (13) are each provided with a first overlapping part (131), and an end portion of each second case wall (14) is provided with a second overlapping part (141), the second overlapping parts (141) and the first overlapping parts (131) being vertically stacked one above the other and being connected to each other; the first case wall (13) is a bottom wall or a top wall; the second case walls (14) are a plurality of side walls, and the plurality of second case walls (14) are successively connected end to end and surround the peripheral edge of the first case wall (13); the first heat exchange member (2) is located inside the accommodation cavity (1a) or outside the accommodation cavity (1a), and the first heat exchange member (2) is used for performing heat exchange with the battery cells (101).

Description

Box assembly, battery and electric device

[0001] Cross-reference to related applications

[0002] The present application is based on and claims priority to Chinese Patent Application No. 202421153739.1, filed on May 24, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a box assembly, a battery and an electric device. BACKGROUND

[0004] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable important role. In the related art, a battery is usually provided with a box assembly for packaging to protect the internal battery monomer. However, the assembly process of the box assembly is relatively complex.

[0005] SUMMARY

[0006] The present application provides a box assembly, a battery and an electric device, which are simple in structure and easy to assemble.

[0007] In a first aspect, the embodiments of the present application provide a box assembly, comprising: a box, the box having a containing cavity for containing a battery monomer, and comprising a first box wall and a second box wall for defining the containing cavity, the first box wall and the second box wall being separate pieces, an end of the first box wall having a first lap joint, an end of the second box wall having a second lap joint, the second lap joint being stacked on the first lap joint and connected to the first lap joint, the first box wall being a bottom wall or a top wall, the second box wall being a side wall and being a plurality of side walls, the plurality of second box walls being connected in sequence at the head and tail and surrounding the periphery of the first box wall; a first heat exchange member, at least one of the first box wall and the second box wall being provided with the first heat exchange member, the first heat exchange member being located in the containing cavity or outside the containing cavity, the first heat exchange member being used for heat exchange with the battery monomer.

[0008] In the technical solution, the first lap joint part and the second lap joint part are arranged to be stacked and connected in sequence, so that when the first box wall and the second box wall are assembled, the first box wall and the second box wall can be directly placed to make the second lap joint part stacked on the first lap joint part, for example, the first box wall is placed horizontally and the second box wall is placed vertically, and then the first lap joint part and the second lap joint part are connected to realize reliable connection of the first box wall and the second box wall. The whole process is convenient to operate, facilitates assembly of the box assembly, and the box assembly has a simple structure. The first heat exchange element arranged in the box is used for heat exchange with the battery monomer, so as to facilitate heat management of the box assembly on the battery monomer, improve the utilization rate of the box space, and improve the integration degree of the box assembly. Meanwhile, the first heat exchange element can enhance the structural strength of the box to a certain extent.

[0009] In some embodiments, the first box wall and the second box wall are made of different materials.

[0010] In the technical solution, the first box wall and the second box wall are made of different materials, so that the materials of the first box wall and the second box wall can be flexibly selected according to the required structural strength, load capacity, material property, and the like of the first box wall and the second box wall, so as to appropriately reduce the cost of the first box wall and the second box wall while meeting the reliability requirements of the first box wall and the second box wall.

[0011] In some embodiments, the first box wall is a composite material part, and the second box wall is a metal part, which is a sheet metal part or a profile part.

[0012] In the technical solution, the first box wall is a composite material part, so that the first box wall has good strength, corrosion resistance and insulation, and is light in weight. The second box wall is a metal part, which is conducive to reducing the cost of the second box wall while ensuring the use reliability of the second box wall.

[0013] In some embodiments, the first lap joint part and the second lap joint part are connected by at least one of adhesive bonding and threaded fastener fixing.

[0014] In the technical solution, the first lap joint part and the second lap joint part are arranged to be stacked and connected in sequence, so that when the first box wall and the second box wall are assembled, the first box wall and the second box wall can be directly placed to make the second lap joint part stacked on the first lap joint part, for example, the first box wall is placed horizontally and the second box wall is placed vertically, and then the first lap joint part and the second lap joint part are connected to realize reliable connection of the first box wall and the second box wall. The whole process is convenient to operate, facilitates assembly of the box assembly, and the box assembly has a simple structure. The first heat exchange element arranged in the box is used for heat exchange with the battery monomer, so as to facilitate heat management of the box assembly on the battery monomer, improve the utilization rate of the box space, and improve the integration degree of the box assembly. Meanwhile, the first heat exchange element can enhance the structural strength of the box to a certain extent.

[0015] In some embodiments, the first lap joint part is stacked on the upper side of the second lap joint part.

[0016] In the technical solution, the first lap joint part is stacked on the upper side of the second lap joint part, the second lap joint part can directly or indirectly support and bear the first lap joint part, which is conducive to reducing and improving the force borne by the fixing part connecting the first lap joint part and the second lap joint part, and facilitating the improvement of the connection reliability of the first lap joint part and the second lap joint part.

[0017] In some embodiments, the first box wall further comprises a main body part, the plurality of first lap joint parts are sequentially connected and arranged around the main body part, each first lap joint part is connected to the main body part by bending, so that the main body part and the plurality of first lap joint parts define a first groove, and the first groove is used to accommodate a second adhesive part, and the second adhesive part is used to connect the main body part and the battery cell.

[0018] In the technical solution, the first groove facilitates reliable connection of the main body part and the battery cell by setting the second adhesive part, and the first groove can limit the thickness of the second adhesive part to some extent, so that the thickness of the second adhesive part can meet the connection requirement and the structural adhesive is not wasted.

[0019] In some embodiments, the box assembly is configured to meet at least one of the following conditions: condition A1, at least one first heat exchange part is integrally formed on the box; condition A2, at least one first heat exchange part is located in the accommodation cavity and is fixed to the box by a third adhesive part; and condition A3, at least one first heat exchange part is located outside the accommodation cavity and is fixed to the box by a fourth adhesive part.

[0020] In the technical solution, at least one of the conditions A1, A2 and A3 is met by setting the box assembly, which facilitates flexible design of the first heat exchange part in terms of setting position and connection mode, and is conducive to improving the adaptability of the box assembly to different use scenarios and other differentiated needs.

[0021] In some embodiments, the first heat exchange part comprises at least one heat exchange pipe, and the heat exchange pipe defines a heat exchange flow channel and is a flat pipe or a harmonica pipe.

[0022] In the technical solution, the heat exchange pipe is set as a flat pipe or a harmonica pipe, which is conducive to saving the occupied space of the heat exchange pipe, and facilitating heat exchange between the thickness side of the heat exchange pipe and the battery cell, so as to achieve the consideration of volume energy density and thermal management of the battery. For example, the heat exchange pipe can be extruded, and the thickness of the heat exchange pipe can be as small as about 0.7 mm. In the related art, a water cooling plate usually comprises two stacked plate bodies, the two plate bodies are welded and fixed and define a flow channel, and the thickness of the water cooling plate is usually the thickness of the glue, which can be more than 2.4 mm. It can be seen that the above setting can reduce the cost of the first heat exchange part and save the occupied space of the first heat exchange part.

[0023] In some embodiments, at least one of the first tank wall and the second tank wall is formed with a second groove, and a first heat exchange member is embedded in the second groove of the first tank wall and / or the second groove of the second tank wall.

[0024] In the technical solution, the second groove is arranged on at least one of the first tank wall and the second tank wall, the tank body itself has a concave-convex structure, the structural strength of the tank body is improved, the first heat exchange member is embedded in the second groove, the first heat exchange member can act as a reinforcing rib of at least one of the first tank wall and the second tank wall, so as to further improve the structural strength of the tank body and the reliability of the tank assembly, and facilitate reducing the height of the first heat exchange member protruding from the surface of the corresponding tank wall of the tank body. For the first heat exchange member located in the accommodation cavity, the height of the first heat exchange member protruding from the inner surface of the tank body is reduced, the interference of the first heat exchange member with the connection of the tank body and the battery cell is reduced, the connection of the tank body and the battery cell is facilitated. For the first heat exchange member located outside the accommodation cavity, the height of the first heat exchange member protruding from the outer surface of the tank body is reduced, and the protection design of the bottom of the tank body is facilitated.

[0025] In some embodiments, the first heat exchange member is located in the accommodation cavity, the second groove has a groove opening, a groove bottom wall and a groove side wall, an end of the groove side wall away from the groove bottom wall defines the groove opening, and a side surface of the first heat exchange member away from the groove bottom wall is recessed relative to the groove opening and toward the groove bottom wall, so that the side surface of the first heat exchange member away from the groove bottom wall and the groove side wall of the second groove define a third groove, and the third groove is used to accommodate a heat-conducting adhesive member, and the heat-conducting adhesive member is used to connect at least the first heat exchange member and the battery cell.

[0026] In the technical solution, the side surface of the first heat exchange member away from the groove bottom wall and the groove side wall of the second groove define the third groove, so that the heat-conducting adhesive member can fill the third groove and the gap between the first heat exchange member and the battery cell, so as to provide a flat connection surface for connecting the battery cell, and facilitate improving the heat exchange efficiency between the first heat exchange member and the battery cell. In addition, in the recessed direction of the second groove, the entire first heat exchange member is accommodated in the second groove, so as to facilitate good protection of the first heat exchange member and reduce the extrusion force between the battery cell and the first heat exchange member.

[0027] In a second aspect, the embodiments of the present application provide a battery, which comprises a battery cell and the above-mentioned tank assembly, and the battery cell is arranged in the accommodation cavity.

[0028] In the technical solution, the battery adopts the above-mentioned tank assembly, and the tank assembly has simple structure and is convenient to assemble, so as to facilitate simplifying the structure of the battery and improving the assembly efficiency of the battery.

[0029] In some embodiments, the battery further comprises a second heat exchange member, and the second heat exchange member is arranged between two adjacent battery cells. In this way, the heat management performance of the battery is improved.

[0030] In some embodiments, the box assembly further comprises a first heat exchange member, at least one of the first box wall and the second box wall is provided with the first heat exchange member, the first heat exchange member is located in the containing cavity or outside the containing cavity, the first heat exchange member is used for heat exchange with the battery monomer, a heat-conducting adhesive member is connected between the battery monomer and the first heat exchange member, a first adhesive member is connected between the first lap joint and the second lap joint, a thermal conductivity of the first adhesive member is less than that of the heat-conducting adhesive member; and / or, a second adhesive member is connected between the battery monomer and the first box wall, a thermal conductivity of the second adhesive member is less than that of the heat-conducting adhesive member; and / or, a third adhesive member is connected between the first box wall or the second box wall and the first heat exchange member located in the containing cavity, a thermal conductivity of the third adhesive member is less than that of the heat-conducting adhesive member.

[0031] In the above technical solution, by setting the thermal conductivity of the first adhesive member to be less than that of the heat-conducting adhesive member, the thermal conductivity of the second adhesive member to be less than that of the heat-conducting adhesive member, and the thermal conductivity of the third adhesive member to be less than that of the heat-conducting adhesive member, efficient heat transfer between the first heat exchange member and the battery monomer is facilitated, and at the same time, the heat or cold quantity transferred by the first heat exchange member to components other than the battery monomer is saved, the proportion of heat or cold quantity transferred by the first heat exchange member to the battery monomer is improved, and the utilization rate of heat or cold quantity of the first heat exchange member is improved.

[0032] In a third aspect, an embodiment of the present application provides a power consumption device, comprising the battery described above.

[0033] In the above technical solution, since the power consumption device adopts the battery described above, and the battery has simple structure and is convenient to assemble, the assembly convenience of the power consumption device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0035] FIG. 1 is a schematic diagram of a power consumption device according to some embodiments of the present application;

[0036] FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

[0037] FIG. 3 is an exploded view of a battery according to some embodiments of the present application;

[0038] FIG. 4 is a partial schematic diagram of the battery shown in FIG. 3;

[0039] FIG. 5 is an assembly schematic diagram of the first box wall and the first heat exchange member shown in FIG. 3;

[0040] FIG. 6 is an assembly schematic diagram of the box, the battery monomer and the first heat exchange member shown in FIG. 3;

[0041] Fig. 7 is a sectional view along line A-A in Fig. 6;

[0042] Fig. 8 is an enlarged view of part B shown in Fig. 7;

[0043] Fig. 9 is a sectional view of the first tank wall and the second tank wall shown in Fig. 8;

[0044] Fig. 10 is a sectional view of the first tank wall, the second tank wall and the first heat exchange member shown in Fig. 8;

[0045] Fig. 11 is an assembly view of the battery cell and the second heat exchange member according to some embodiments of the present application.

[0046] Reference signs:

[0047] the electrical device 1000, the controller 300, the motor 400, the battery 200, the battery cell 101,

[0048] the tank assembly 100,

[0049] the tank 1, the accommodating cavity 1a, the second recess 1b, the slot 1c, the slot bottom wall 1d, the slot side wall 1e, the third recess 1f,

[0050] the first tank 11, the second tank 12,

[0051] the first tank wall 13, the first recess 13a, the first lap joint 131, the main body 132,

[0052] the second tank wall 14, the second lap joint 141, the first adhesive member 15,

[0053] the first heat exchange member 2, the heat exchange pipe 21, the second heat exchange member 3,

[0054] the second adhesive member 102, the heat-conductive adhesive member 103, the third adhesive member 104, the integral adhesive member 105. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise", "comprises", "comprising", "containing", "contains", "contain" or any other variation thereof, is intended to cover a non-exclusive inclusion; the use herein of terms such as "first", "second" or "third" or any other variation thereof is intended to cover the distinction between different objects and is not intended to cover a particular order or a particular priority.

[0057] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments.

[0058] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood in a broad sense, for example, can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0059] In this application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in this application generally represents an "or" relationship between the front and rear associated objects.

[0060] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings are only exemplary and should not constitute any limitation on the application.

[0061] "Multiple" appearing in this application refers to two or more (including two).

[0062] In this application, the battery cell can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc. The embodiments of the application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid (such as a blade battery, etc.), or other shapes, etc. The embodiments of the application are also not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell and soft package battery cell, and the embodiments of the application are also not limited thereto.

[0063] The battery mentioned in the embodiments of the present application refers to a single physical module comprising a plurality of battery monomers to provide higher voltage and capacity. For example, the battery mentioned in the present application can be a battery module or a battery pack, etc. The battery module generally comprises a plurality of battery monomers. The battery generally comprises a box for packaging a plurality of battery monomers or a plurality of battery modules, which can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomers.

[0064] Exemplarily, the battery monomer can generally comprise a shell, an electrode core assembly and an electrolyte, the shell being used for accommodating the electrode core assembly and the electrolyte, the shell being provided with at least one positive pole and at least one negative pole. The electrode core assembly comprises one or more electrode assemblies, the electrode assembly being formed by stacking or winding a positive pole sheet, a negative pole sheet and a separator film.

[0065] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, the battery, as the power source of the electric vehicle, plays an irreplaceable important role. In the related technology, the battery is generally provided with a box assembly for packaging to play a certain protection role on the internal battery monomer. However, the box assembly assembly process is relatively complex.

[0066] Based on the above consideration, a box assembly is provided, comprising a box and a first heat exchange member, the box having an accommodating cavity for accommodating a battery monomer, and the box comprising a first box wall and a second box wall for defining the accommodating cavity, the first box wall and the second box wall being separate pieces, the end of the first box wall having a first lap joint, the end of the second box wall having a second lap joint, the second lap joint being stacked on the first lap joint and connected, the first box wall being a bottom wall or a top wall, the second box wall being a plurality of side walls and being connected in sequence at the head and tail of the first box wall and surrounding the periphery of the first box wall, at least one of the first box wall and the second box wall being provided with the first heat exchange member, the first heat exchange member being located in the accommodating cavity or outside the accommodating cavity, the first heat exchange member being used for heat exchange with the battery monomer.

[0067] In the above technical solution, by providing the first lap joint and the second lap joint, the second lap joint is stacked on the first lap joint and connected, so that when the first box wall and the second box wall are assembled, the first box wall and the second box wall can be directly placed so that the second lap joint is stacked on the first lap joint, for example, the first box wall is horizontally placed and the second box wall is vertically placed, and then the first lap joint and the second lap joint are connected to realize reliable connection of the first box wall and the second box wall. The whole process is convenient to operate, facilitates assembly of the box assembly, and the structure of the box assembly is simple; by using the first heat exchange member provided on the box for heat exchange with the battery monomer, the box assembly can realize heat management of the battery monomer, which is conducive to improving the utilization rate of the box space and the integration degree of the box assembly; at the same time, the first heat exchange member can enhance the structural strength of the box to a certain extent.

[0068] The embodiments of the present application provide a power consumption device using the battery of the present disclosure as a power supply. The power consumption 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 automobile, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like. The electric tool can include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, an electric planer, and the like.

[0069] The following embodiments are described by taking the power consumption device 1000 as a vehicle for example for convenience of description.

[0070] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of the power consumption device 1000 as a vehicle according to some embodiments of the present application. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile. The vehicle is provided with a battery 200. The battery 200 can be arranged at the bottom, the head, or the tail of the vehicle. The battery 200 can be used for power supply of the vehicle, for example, the battery 200 can be used as an operating power supply of the vehicle. The vehicle can further include a controller 300 and a motor 400. The controller 300 is used to control the battery 200 to supply power to the motor 400, for example, to meet the working power demand of the vehicle during starting, navigation, and driving. In some embodiments of the present application, the battery 200 can be used not only as an operating power supply of the vehicle, but also as a driving power supply of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0071] Please refer to FIG. 2, which is an exploded view of a battery 200 according to some embodiments of the present application. The battery 200 includes a battery case assembly 100 and a plurality of battery cells 101, which are accommodated in the battery case assembly 100. The battery case assembly 100 includes a case 1 for providing a mounting space for the battery cells 101, which can have various structures. In some embodiments, the case 1 can include a first case 11 and a second case 12, which are overlapped with each other, and together define an accommodation cavity 1a for accommodating the battery cells 101. The second case 12 can be a hollow structure with one end open, and the first case 11 can be a plate structure, which is overlapped with the open end of the second case 12 to define the accommodation cavity 1a together with the second case 12. Alternatively, the first case 11 and the second case 12 can both be hollow structures with one side open (as shown in FIG. 2), and the open side of the first case 11 is overlapped with the open side of the second case 12. Of course, the case 1 formed by the first case 11 and the second case 12 can have various shapes, such as a cylinder or a cuboid.

[0072] In the battery 200, the plurality of battery cells 101 can be connected in series, in parallel, or in a mixed manner, where the mixed manner means that the plurality of battery cells 101 are connected in series and in parallel. The plurality of battery cells 101 can be directly connected in series, in parallel, or in a mixed manner, and then the whole is accommodated in the case 1. Alternatively, the battery 200 can be in the form of a plurality of battery modules, which are connected in series, in parallel, or in a mixed manner, and then the whole is accommodated in the case 1. The battery 200 can also include other structures, for example, the battery 200 can include busbars for electrically connecting the plurality of battery cells 101.

[0073] Please refer to FIGS. 3-8. In the embodiments of the present application, the battery case assembly 100 includes a case 1, which has an accommodation cavity 1a for accommodating the battery cells 101, and the case 1 includes a first case wall 13 and a second case wall 14, which are adjacent to each other and both participate in defining the accommodation cavity 1a. Exemplarily, the first case wall 13 and the second case wall 14 form adjacent cavity walls of the accommodation cavity 1a.

[0074] The first box wall 13 and the second box wall 14 are separate parts, the first box wall 13 is a bottom wall or a top wall, the second box wall 14 is a side wall, and the second box wall 14 is a plurality of second box walls 14 connected in sequence, so that the plurality of second box walls 14 define a substantially annular structure, and the plurality of second box walls 14 are arranged around the periphery of the first box wall 13. Then the first box wall 13 can participate in forming the top side cavity wall or the bottom side cavity wall of the containing cavity 1a, and the plurality of second box walls 14 can form the circumferential side cavity wall of the containing cavity 1a. Thus, the first box wall 13 and the second box wall 14 can be machined separately, and the first box wall 13 and the second box wall 14 are relatively simple in structure relative to the entire box 1, facilitating the machining of the first box wall 13 and the second box wall 14. Wherein, the "annular" is understood in a broad sense, that is, not limited to "circular ring", for example, it can also be "polygonal ring" and the like.

[0075] The end of the first box wall 13 has a first lap joint 131, and the end of the second box wall 14 has a second lap joint 141. The second lap joint 141 is stacked above and below the first lap joint 131, and the second lap joint 141 is connected with the first lap joint 131. This facilitates the first lap joint 131 and the second lap joint 141 to have sufficient relative area in the up-down direction, so that the first lap joint 131 and the second lap joint 141 have a suitable connection area, facilitating the reliable connection of the first lap joint 131 and the second lap joint 141, while facilitating the second lap joint 141 to better bear the force exerted by the first lap joint 131 in the vertical direction, which is beneficial to reduce the shear force on the connection position of the first lap joint 131 and the second lap joint 141, and is beneficial to further improve the connection reliability of the first box wall 13 and the second box wall 14.

[0076] Please refer to FIG. 3, FIG. 5 and FIG. 8. In some embodiments, the box assembly 100 further comprises a first heat exchange member 2, which is arranged in the box 1, for example, at least one of the first box wall 13 and the second box wall 14 is provided with the first heat exchange member 2. The first heat exchange member 2 is located in the containing cavity 1a or outside the containing cavity 1a, and is used for heat exchange with the battery monomer 101 to adjust the temperature of the battery monomer 101, facilitating the thermal management of the battery monomer 101.

[0077] The first heat exchange member 2 can be configured to only cool the battery monomer 101, or the first heat exchange member 2 is configured to only heat the battery monomer 101, or the first heat exchange member 2 is configured to not only cool the battery monomer 101 but also heat the battery monomer 101.

[0078] It can be understood that when the first heat exchange member 2 is located in the accommodation cavity 1a, for a single first heat exchange member 2, the first heat exchange member 2 can be located between the battery monomer 101 and the box body 1, so as to facilitate good heat transfer between the first heat exchange member 2 and the battery monomer 101. At this time, the first heat exchange member 2 can be arranged on either side of the battery monomer 101, for example, the first heat exchange member 2 can be arranged between the first plate and the battery monomer 101, and / or the first heat exchange member 2 is arranged between the second plate and the battery monomer 101. At least one side of the upper side, the lower side, the left side, the right side, the front side and the rear side of the battery monomer 101 is provided with the first heat exchange member 2. In other words, for the box body 1, at least one of the top wall, the bottom wall and the side wall of the box body 1 is provided with the first heat exchange member 2.

[0079] For the first heat exchange member 2 located outside the accommodation cavity 1a, for example, the first heat exchange member 2 can be attached to the outer wall of the box body 1, such as the first heat exchange member 2 being attached to the outer surface of the first box wall 13 and / or the first heat exchange member 2 being attached to the outer surface of the second box wall 14, so as to make the first heat exchange member 2 exchange heat with the battery monomer 101 through the box body 1. The first heat exchange member 2 is separated from the battery monomer 101 by the box body 1, and the insulation between the first heat exchange member 2 and the battery monomer 101 can not be considered, the insulation design of the first heat exchange member 2 can be simplified, the setting of the battery 200 can be simplified, the processing difficulty and production cost can be reduced, and the first heat exchange member 2 located outside the accommodation cavity 1a will not occupy the space in the box body 1, so that the capacity of the battery 200 will not be reduced due to the first heat exchange member 2. Of course, for the first heat exchange member 2 located outside the accommodation cavity 1a, heat-conducting glue is arranged between the first heat exchange member 2 and the outer wall of the box body 1, so as to realize reliable heat exchange between the first heat exchange member 2 and the battery monomer 101.

[0080] In addition, the box body assembly 100 can include one or more first heat exchange members 2. When the first heat exchange member 2 is one, the first heat exchange member 2 can be located in the accommodation cavity 1a or outside the accommodation cavity 1a. When the first heat exchange member 2 is multiple, for a single first heat exchange member 2, it can be located in the accommodation cavity 1a or outside the accommodation cavity 1a. For multiple first heat exchange members 2, all the first heat exchange members 2 are located in the accommodation cavity 1a, or all the first heat exchange members 2 are located outside the accommodation cavity 1a, or at least one first heat exchange member 2 is located in the accommodation cavity 1a and at least one first heat exchange member 2 is located outside the accommodation cavity 1a.

[0081] In the technical solution, the first overlap part 131 and the second overlap part 141 are arranged, the second overlap part 141 is stacked on the first overlap part 131, and the first box wall 13 and the second box wall 14 are connected, the first box wall 13 and the second box wall 14 are placed to make the second overlap part 141 stacked on the first overlap part 131, for example, the first box wall 13 is placed horizontally, and the second box wall 14 is placed vertically, and then the first overlap part 131 and the second overlap part 141 are connected to realize reliable connection of the first box wall 13 and the second box wall 14, the whole process is convenient, the assembly of the box assembly 100 is facilitated, and the structure of the box assembly 100 is simple; the first heat exchange element 2 arranged in the box 1 is used for heat exchange with the battery monomer 101, heat management of the battery monomer 101 is facilitated, the utilization rate of the space of the box 1 is improved, and the integration degree of the box assembly 100 is improved; meanwhile, the first heat exchange element 2 can enhance the structural strength of the box 1 to a certain extent.

[0082] Exemplarily, the first heat exchange element 2 has at least one heat exchange flow channel, and the heat exchange flow channel is used for containing a heat exchange medium, for example, water, refrigerant or the like.

[0083] Exemplarily, the plurality of second box walls 14 can be an integral piece, for example, the plurality of second box walls 14 are configured as an integral stamping piece; or the plurality of second box walls 14 are separate pieces, and adjacent two second box walls 14 are fixedly connected through assembly means.

[0084] In some embodiments, the first box wall 13 and the second box wall 14 are made of different materials.

[0085] In the technical solution, the materials of the first box wall 13 and the second box wall 14 are different, the materials of the first box wall 13 and the second box wall 14 can be flexibly selected according to the structural strength, bearing capacity requirement, material property requirement and the like of the first box wall 13 and the second box wall 14, so that the cost of the first box wall 13 and the second box wall 14 is appropriately reduced under the premise of meeting the reliability requirements of the first box wall 13 and the second box wall 14.

[0086] In some embodiments, the first box wall 13 is a composite material piece, and the second box wall 14 is a metal piece.

[0087] In the technical solution, the first box wall 13 is a composite material piece, so that the first box wall 13 has good strength, corrosion resistance and insulation, and is light in weight, and the second box wall 14 is a metal piece, which is conducive to reducing the cost of the second box wall 14 under the premise of realizing reliable use of the second box wall 14.

[0088] Exemplarily, the first box wall 13 is a composite material piece, and the battery monomer 101 in the accommodating cavity 1a is connected with the first box wall 13, so as to facilitate the insulation between the first box wall 13 and the battery monomer 101, and facilitate the simplification of the insulation between the first box wall 13 and the battery monomer 101, for example, the first box wall 13 does not need to additionally increase an insulation layer. The first box wall 13 is a bottom wall and is a composite material piece, so that even if the battery monomer 101 leaks and the electrolyte flows to the first box wall 13, the first box wall 13 is not easy to be corroded to weaken the strength of the first box wall 13, and the use reliability of the box body 1 is facilitated to be improved.

[0089] For example, the second box wall 14 can be a sheet metal piece, so as to facilitate the reliable structural strength through the lighter weight of the second box wall 14, and the cost of the second box wall 14 is relatively low; of course, the second box wall 14 can also be a profiled piece, at this time, a plurality of second box walls 14 can constitute a profiled frame, and the second box wall 14 has good structural strength, and the use reliability of the second box wall 14 in the circumferential direction of the box body 1 is facilitated to be improved, and the collision received can be better offset, so as to facilitate the reliable protection of the battery monomer 101.

[0090] Please refer to FIG. 8, in some embodiments, the first lap joint part 131 and the second lap joint part 141 are connected by at least one of the following modes: adhesive fixing and threaded fastener (such as bolt, etc.) fixing.

[0091] In the above technical solution, the first lap joint part 131 and the second lap joint part 141 are fixed by adhesive and / or threaded fastener, so as to facilitate the reliable fixing of the first box wall 13 and the second box wall 14 with different materials, that is, the above connection mode of the first box wall 13 and the second box wall 14 is not easy to be affected by the factors of different materials to cause connection difficulty, connection quality problem, etc., so as to facilitate the improvement of the use reliability of the box body assembly 100.

[0092] Exemplarily, the first box wall 13 is a composite material piece, the second box wall 14 is a metal piece, and the first lap joint part 131 and the second lap joint part 141 are adhesively fixed; or, the first box wall 13 is a composite material piece, the second box wall 14 is a metal piece, and the first lap joint part 131 and the second lap joint part 141 are fixed by bolts.

[0093] Please refer to FIG. 8, in some embodiments, the first lap joint part 131 is stacked on the upper side of the second lap joint part 141.

[0094] In the technical solution, the first lap joint portion 131 is stacked on the upper side of the second lap joint portion 141, the second lap joint portion 141 can directly or indirectly support and bear the first lap joint portion 131, which is conducive to reducing and improving the force borne by the fixing member (for example, the first adhesive member 15 and the threaded fastener) connecting the first lap joint portion 131 and the second lap joint portion 141, and facilitating improvement of the connection reliability of the first lap joint portion 131 and the second lap joint portion 141.

[0095] Of course, in other embodiments, the first lap joint portion 131 can also be stacked on the lower side of the second lap joint portion 141. It can be understood that, in the embodiments of the present application, whether the first lap joint portion 131 is stacked on the upper side of the second lap joint portion 141 or the second lap joint portion 141 is stacked on the upper side of the first lap joint portion 131, the first lap joint portion 131 and the second lap joint portion 141 can be in contact or spaced apart.

[0096] Please refer to FIGS. 8-10, in some embodiments, the first box wall 13 further comprises a main body portion 132, a plurality of first lap joint portions 131 are sequentially connected in head-to-tail manner, and the plurality of first lap joint portions 131 are arranged around the periphery of the main body portion 132, each first lap joint portion 131 is connected to the main body portion 132 by bending, so that the main body portion 132 and the plurality of first lap joint portions 131 define a first recess 13a, the first recess 13a is used for accommodating a second adhesive member 102, and the second adhesive member 102 is used for connecting the main body portion 132 and the battery monomer 101.

[0097] It can be seen that the first recess 13a facilitates reliable connection of the main body portion 132 and the battery monomer 101 by arranging the second adhesive member 102, and at the same time, the first recess 13a can limit the thickness of the second adhesive member 102 to some extent, so that the thickness of the second adhesive member 102 can meet the connection requirement and at the same time, the waste of structural adhesive can be avoided.

[0098] Please refer to FIG. 8, in some embodiments, the box assembly 100 is configured to meet at least one of the following conditions: condition A1, at least one first heat exchange member 2 is integrally formed on the box 1; condition A2, at least one first heat exchange member 2 is located in the accommodation cavity 1a, and the at least one first heat exchange member 2 located in the accommodation cavity 1a is fixed to the box 1 by a third adhesive member 104; and condition A3, at least one first heat exchange member 2 is located outside the accommodation cavity 1a, and the at least one first heat exchange member 2 located outside the accommodation cavity 1a is fixed to the box 1 by a fourth adhesive member.

[0099] It can be seen that for the first heat exchange member 2 satisfying the condition A1, it can be located outside the containing cavity 1a or inside the containing cavity 1a; for example, the first heat exchange member 2 is integrally formed on the first tank wall 13, the first tank wall 13 is a composite material member, and the first heat exchange member 2 can be a composite material member or a metal member (such as aluminum or the like), if the first heat exchange member 2 is arranged on the inner side of the first tank wall 13, similarly, the first heat exchange member 2 arranged on the second tank wall 14 can be integrally formed on the second tank wall 14.

[0100] Obviously, in the embodiments of the present application, for a single first heat exchange member 2, no matter it is located outside the containing cavity 1a or inside the containing cavity 1a, the connection mode of the first heat exchange member 2 with the tank body 1 can include but is not limited to: the first heat exchange member 2 is integrally formed on the corresponding tank wall of the tank body 1, and the first heat exchange member 2 is glued to the corresponding tank wall of the tank body 1.

[0101] In the above technical solution, by arranging the tank body assembly 100 to satisfy at least one of the conditions A1, A2 and A3, the flexible design of the first heat exchange member 2 in the arrangement position and the connection mode is facilitated, and the adaptability of the tank body assembly 100 to different use scenarios and other differentiated needs is improved.

[0102] It can be understood that when the tank body assembly 100 is configured to satisfy at least two of the conditions A1, A2 and A3, the first heat exchange member 2 is multiple; for example, the tank body assembly 100 is configured to satisfy the conditions A1 and A2, and not to satisfy the condition A3, at least one first heat exchange member 2 satisfies the condition A1, and at least one of the remaining first heat exchange members 2 satisfies the condition A2. Of course, when the tank body assembly 100 is configured to satisfy any one of the conditions A1, A2 and A3, the first heat exchange member 2 can be one or more.

[0103] Please refer to FIG. 8 and FIG. 10, in some embodiments, the first heat exchange member 2 includes at least one heat exchange pipe 21, the heat exchange pipe 21 defines a heat exchange flow channel, and the heat exchange pipe 21 is a flat tube or a harmonica tube, then the width of the heat exchange pipe 21 is the maximum radial dimension x1 of the cross-sectional outer contour of the heat exchange pipe 21, and the thickness x2 of the heat exchange pipe 21 is less than x1, then on the cross section of the heat exchange pipe 21, the thickness of the heat exchange pipe 21 is less than the width of the heat exchange pipe 21, and the cross section of the heat exchange pipe 21 is perpendicular to the central axis of the heat exchange pipe 21. Of course, in other examples, the heat exchange pipe 21 is a circular tube, then the outer diameter of the heat exchange pipe 21 is the maximum radial dimension x1 of the cross-sectional outer contour of the heat exchange pipe 21.

[0104] In the technical solution, the heat exchange pipe 21 is a flat pipe or a harmonica pipe, which is beneficial to save the occupied space of the heat exchange pipe 21, and facilitates heat exchange between the thickness side of the heat exchange pipe 21 and the battery monomer 101, so as to realize the balance between the volume energy density and the heat management of the battery 200. For example, the heat exchange pipe 21 can be extruded, and the thickness of the heat exchange pipe 21 can be as small as about 0.7 mm. In the related art, the water cooling plate structure usually includes two stacked plate bodies, and the two plate bodies are welded and fixed to define a flow channel. Therefore, the thickness of the water cooling plate is usually thick, which can be more than 2.4 mm. It can be seen that the above-mentioned setting of the present application can reduce the cost of the first heat exchange member 2, and save the occupied space of the first heat exchange member 2.

[0105] In the embodiment of the present application, the harmonica pipe can be understood as adding at least one separation structure inside the flat pipe to separate the internal space of the flat pipe into multiple flow channels, and the two ends of each flow channel are respectively communicated with the liquid inlet end and the liquid outlet end of the heat exchange pipe 21. Among them, the multiple flow channels can be arranged at intervals along the width direction of the flat pipe; or the multiple flow channels can be arranged in multiple rows and multiple columns along the width direction of the flat pipe and the thickness direction of the flat pipe.

[0106] Exemplarily, the length of the heat exchange pipe 21 has a first communication port and a second communication port communicated with the heat exchange flow channel at both ends, respectively, one of the first communication port and the second communication port serves as the inlet of the heat exchange flow channel, and the other serves as the outlet of the heat exchange flow channel.

[0107] Please refer to FIG. 3, FIG. 8-FIG. 10, in some embodiments, at least one of the first box wall 13 and the second box wall 14 is formed with a second groove 1b, the first heat exchange member 2 is embedded in the second groove 1b of the first box wall 13, and / or the first heat exchange member 2 is embedded in the second groove 1b of the second box wall 14, then at least part of the first heat exchange member 2 is embedded in the second groove 1b.

[0108] It can be understood that part of the first heat exchange member 2 is embedded in the second groove 1b, and the other part protrudes from the groove opening 1c of the second groove 1b; or the entire first heat exchange member 2 is embedded in the second groove 1b in the recess direction of the second groove 1b, at this time, the side surface of the first heat exchange member 2 away from the groove bottom wall 1d can be flush with the groove opening 1c of the second groove 1b, or the side surface of the first heat exchange member 2 away from the groove bottom wall 1d is recessed relative to the groove opening 1c and towards the groove bottom wall 1d.

[0109] In the above technical solution, the second groove 1b is arranged on at least one of the first box wall 13 and the second box wall 14, the box 1 itself has a concave-convex structure, the structure strength of the box 1 can be improved, the first heat exchange element 2 is embedded in the second groove 1b, the first heat exchange element 2 can act as a reinforcing rib of at least one of the first box wall 13 and the second box wall 14, so as to further improve the structure strength of the box 1 and the reliability of the box assembly 100, and facilitate reducing the height of the first heat exchange element 2 protruding from the surface of the corresponding box wall of the box 1. For the first heat exchange element 2 located in the accommodation cavity 1a, the height of the first heat exchange element 2 protruding from the inner surface of the box 1 can be reduced, the interference of the first heat exchange element 2 to the connection of the box 1 and the battery monomer 101 is reduced, and the connection of the box 1 and the battery monomer 101 is facilitated. For the first heat exchange element 2 located outside the accommodation cavity 1a, the height of the first heat exchange element 2 protruding from the outer surface of the box 1 can be reduced, and the protection design of the bottom of the box 1 is facilitated.

[0110] It can be understood that when the slot opening 1c of the second groove 1b is arranged towards the accommodation cavity 1a, the first heat exchange element 2 embedded in the second groove 1b is located in the accommodation cavity 1a, and at this time the second groove 1b is in communication with the accommodation cavity 1a; when the slot opening 1c of the second groove 1b is arranged away from the accommodation cavity 1a, the first heat exchange element 2 embedded in the second groove 1b is located outside the accommodation cavity 1a. Of course, the second groove 1b can also not be arranged on the box 1, the first heat exchange element 2 arranged on the first box wall 13 can be connected to the inner surface of the first box wall 13 or the outer surface of the first box wall 13, and the first heat exchange element 2 arranged on the second box wall 14 can be connected to the inner surface of the second box wall 14 or the outer surface of the second box wall 14.

[0111] Exemplarily, the first heat exchange element 2 includes at least one heat exchange pipe 21, the heat exchange pipe 21 is a flat pipe, a harmonica pipe or a circular pipe, and at least part of the heat exchange pipe 21 is embedded in the second groove 1b; when the heat exchange pipe 21 is a hollow flat pipe or a harmonica pipe, the second groove 1b can be a square groove matched with the shape of the flat pipe; when the heat exchange pipe 21 is a hollow circular pipe, the second groove 1b can be a circular groove matched with the shape of the circular pipe.

[0112] The extension shape of the heat exchange pipe 21 is not specifically limited in the present application, and the arrangement mode of the plurality of heat exchange pipes 21 is also not specifically limited in the present application. For example, the heat exchange pipe 21 includes a plurality of first pipe segments and a plurality of second pipe segments. The plurality of first pipe segments are arranged at intervals along a first direction, and each first pipe segment can extend along a second direction. The plurality of second pipe segments are arranged at intervals along the first direction, and each second pipe segment connects two adjacent first pipe segments, so that the plurality of first pipe segments are arranged in series. Then, two adjacent second pipe segments are located at two ends of the same first pipe segment in the second direction. At this time, the heat exchange pipe 21 can be approximately S-shaped. The first direction can be the length direction of the battery monomer 101, and the second direction can be the thickness direction of the battery monomer 101, but is not limited thereto.

[0113] Please refer to FIGS. 8-10. In some embodiments, the first heat exchange piece 2 is located in the containing cavity 1a, the second groove 1b has a slot opening 1c, a groove bottom wall 1d, and a groove side wall 1e. The end of the groove side wall 1e away from the groove bottom wall 1d defines the slot opening 1c. The side surface of the first heat exchange piece 2 away from the groove bottom wall 1d is recessed relative to the slot opening 1c and faces the groove bottom wall 1d. The side surface of the first heat exchange piece 2 away from the groove bottom wall 1d and the groove side wall 1e of the second groove 1b define a third groove 1f. The third groove 1f is used to contain a heat-conducting adhesive piece 103. The heat-conducting adhesive piece 103 is used to connect at least the first heat exchange piece 2 and the battery monomer 101. It can be understood that the first heat exchange piece 2 is connected to the box 1, or the first heat exchange piece 2 is integrally formed on the box 1. Then, the first heat exchange piece 2 can realize the connection between the battery monomer 101 and the box 1.

[0114] It can be seen that, due to the side surface of the first heat exchange piece 2 away from the groove bottom wall 1d and the groove side wall 1e of the second groove 1b defining the third groove 1f, the heat-conducting adhesive piece 103 can fill the third groove 1f and fill the gap between the first heat exchange piece 2 and the battery monomer 101. Thus, the box assembly 100 can provide a flat connection surface for connecting with the battery monomer 101. At the same time, it is beneficial to improve the heat exchange efficiency between the first heat exchange piece 2 and the battery monomer 101, so as to meet the heating and cooling requirements of the battery monomer 101. In addition, in the recessed direction of the second groove 1b, the entire first heat exchange piece 2 is accommodated in the second groove 1b, which is beneficial to realize good protection of the first heat exchange piece 2 and reduce the extrusion force between the battery monomer 101 and the first heat exchange piece 2.

[0115] In addition, the above arrangement can also make the first heat exchange piece 2 and the battery monomer 101 be arranged at intervals, which is beneficial to improve the assembly and insulation problems of the first heat exchange piece 2 caused by direct contact with the battery monomer 101, and is beneficial to simplify the insulation design of the first heat exchange piece 2.

[0116] Exemplarily, in combination with FIGS. 8-10, the first box wall 13 includes a main body portion 132, a plurality of first lap portions 131 are sequentially connected in head-to-tail manner, and the plurality of first lap portions 131 are arranged around the periphery of the main body portion 132. Each first lap portion 131 is connected to the main body portion 132 by bending, so that a first recess 13a is defined between the main body portion 132 and the plurality of first lap portions 131. The first recess 13a is used to accommodate a second adhesive member 102, and the second adhesive member 102 is used to connect the main body portion 132 and the battery monomer 101. The main body portion 132 is formed with a second recess 1b, and a slot opening 1c of the second recess 1b is arranged towards the accommodating cavity 1a. If the first box wall 13 is a bottom wall, the upper surface of the first heat exchange member 2 is recessed downwards relative to the slot opening 1c, i.e., the upper surface of the first heat exchange member 2 is lower than the slot opening 1c, so that the upper surface of the first heat exchange member 2 and the slot side wall 1e define a third recess 1f. If the first box wall 13 is a top wall, the lower surface of the first heat exchange member 2 is recessed upwards relative to the slot opening 1c, i.e., the lower surface of the first heat exchange member 2 is higher than the slot opening 1c, so that the lower surface of the first heat exchange member 2 and the slot side wall 1e define the third recess 1f.

[0117] When the box assembly 100 is used for the battery 200, the second adhesive member 102 is arranged in the first recess 13a, and the heat-conductive adhesive member 103 is arranged in the third recess 1f. The second adhesive member 102 and the heat-conductive adhesive member 103 are both connected to the battery monomer 101, so as to provide sufficient connection area between the battery monomer 101 and the first box wall 13, and to realize reliable connection between the battery monomer 101 and the first box wall 13. Exemplarily, the side surface of the second adhesive member 102 away from the main body portion 132 is arranged flush with the side surface of the heat-conductive adhesive member 103 away from the first heat exchange member 2, so as to provide a flat connection surface for the battery monomer 101.

[0118] In a second aspect, the embodiments of the present application provide a battery 200, which includes the battery monomer 101 and the above-described box assembly 100. The battery monomer 101 is arranged in the accommodating cavity 1a.

[0119] In the above technical solution, since the battery 200 adopts the above-described box assembly 100, and the box assembly 100 is simple in structure and convenient to assemble, the structure of the battery 200 is simplified, and the assembly efficiency of the battery 200 is improved.

[0120] Please refer to FIG. 11. In some embodiments, the battery 200 further includes a second heat exchange member 3, and the second heat exchange member 3 is arranged between two adjacent battery monomers 101. Therefore, the second heat exchange member 3 can exchange heat with at least two battery monomers 101. In this way, the heat management performance of the battery 200 is improved. Of course, the battery 200 can also not be provided with the second heat exchange member 3.

[0121] Please refer to FIG. 8, in some embodiments, the box assembly 100 further comprises a first heat exchange member 2, the first heat exchange member 2 is arranged in the box 1, for example, at least one of the first box wall 13 and the second box wall 14 is provided with the first heat exchange member 2, the first heat exchange member 2 is located in the containing cavity 1a or outside the containing cavity 1a, the first heat exchange member 2 is used for heat exchange with the battery monomer 101; the battery monomer 101 is connected with the first heat exchange member 2 through a heat-conducting adhesive member 103, the heat-conducting adhesive member 103 can realize heat transfer between the battery monomer 101 and the first heat exchange member 2, for example, the heat of the battery monomer 101 is transferred to the first heat exchange member 2 through the heat-conducting adhesive member 103.

[0122] Wherein, the first lap joint 131 and the second lap joint 141 are connected with the first adhesive member 15, the thermal conductivity of the first adhesive member 15 is less than the thermal conductivity of the heat-conducting adhesive member 103, then the heat-conducting performance of the heat-conducting adhesive member 103 is superior to the first adhesive member 15; and / or, the battery monomer 101 and the first box wall 13 are connected with the second adhesive member 102, the thermal conductivity of the second adhesive member 102 is less than the thermal conductivity of the heat-conducting adhesive member 103, then the heat-conducting performance of the heat-conducting adhesive member 103 is superior to the second adhesive member 102; and / or, the first box wall 13 or the second box wall 14 and the first heat exchange member 2 located in the containing cavity 1a are connected with the third adhesive member 104, the thermal conductivity of the third adhesive member 104 is less than the thermal conductivity of the heat-conducting adhesive member 103, then the heat-conducting performance of the heat-conducting adhesive member 103 is superior to the third adhesive member 104.

[0123] In the above technical solution, by setting the thermal conductivity of the first adhesive member 15 less than the thermal conductivity of the heat-conducting adhesive member 103, the thermal conductivity of the second adhesive member 102 less than the thermal conductivity of the heat-conducting adhesive member 103, and the thermal conductivity of the third adhesive member 104 less than the thermal conductivity of the heat-conducting adhesive member 103, it is convenient to realize efficient heat transfer between the first heat exchange member 2 and the battery monomer 101, and at the same time, it is beneficial to save the heat or cold quantity transferred by the first heat exchange member 2 to other components except the battery monomer 101, and it is beneficial to improve the proportion of heat or cold quantity transferred by the first heat exchange member 2 to the battery monomer 101, and improve the utilization rate of heat or cold quantity of the first heat exchange member 2.

[0124] For example, taking the first box wall 13 provided with the first heat exchange member 2 as an example, the first box wall 13 is formed with a second groove 1b, the slot opening 1c of the second groove 1b is arranged towards the containing cavity 1a, at least part of the first heat exchange member 2 is embedded in the second groove 1b, and the third adhesive member 104 is connected between the first heat exchange member 2 and the groove wall (including the groove bottom wall 1d) of the second groove 1b, then the third adhesive member 104 at least separates the first heat exchange member 2 from the groove bottom wall 1d of the second groove 1b, which is beneficial to reduce the heat exchange quantity of the first heat exchange member 2 towards the first box wall 13.

[0125] Exemplarily, the first lap joint 131 and the second lap joint 141 are connected with the first adhesive 15, the battery monomer 101 is connected with the second adhesive 102 between the first box wall 13 and the first heat exchange element 2 located in the accommodating cavity 1a, and the first box wall 13 or the second box wall 14 is connected with the third adhesive 104 between the first heat exchange element 2 located outside the accommodating cavity 1a. In the embodiment of the application, the thermal conductivities of the first adhesive 15, the second adhesive 102 and the third adhesive 104 are not specifically limited, and the thermal conductivities of the three can be equal, but are not limited to this.

[0126] In other embodiments, the thermal conductivities of at least one of the first adhesive 15, the second adhesive 102 and the third adhesive 104 can also be equal to the thermal conductivity of the heat-conducting adhesive 103. For example, the second adhesive 102, the third adhesive 104 and the heat-conducting adhesive 103 are of the same material and are integrated into the adhesive 105.

[0127] In some embodiments, the first box wall 13 or the second box wall 14 is connected with the fourth adhesive between the first heat exchange element 2 located outside the accommodating cavity 1a, and the first heat exchange element 2 and the battery monomer 101 transmit heat through the first box wall 13 or the second box wall 14 and the fourth adhesive. The thermal conductivity of the fourth adhesive can be equal to the thermal conductivity of the heat-conducting adhesive 103.

[0128] Taking the first box body 11 located on the upper side of the second box body 12 as an example, in combination with FIG. 2 and FIG. 3, the first box body 11 includes the first box wall 13 and a plurality of second box walls 14, and the first box wall 13 of the first box body 11 is a top wall. The second box body 12 includes the first box wall 13 and a plurality of second box walls 14, and the first box wall 13 of the second box body 12 is a bottom wall. Of course, in other examples, the first box body 11 includes the first box wall 13 but does not include the second box wall 14, and the second box body 12 still includes the first box wall 13 and a plurality of second box walls 14.

[0129] In a third aspect, an embodiment of the application provides a power utilization device 1000, which includes the above-mentioned battery 200, and the battery 200 is used to provide electric energy.

[0130] In the above technical solution, since the power utilization device 1000 adopts the above-mentioned battery 200, and the battery 200 has simple structure and is convenient to assemble, the assembly convenience of the power utilization device 1000 is improved.

[0131] Please refer to FIG. 3-FIG. 10 again, and the battery 200 of the embodiment of the application is described.

[0132] In the embodiment of the present application, the battery 200 comprises the battery cell 101 and the box assembly 100, the box assembly 100 comprises the box 1 and the first heat exchange member 2, the box 1 has the containing cavity 1a inside, the battery cell 101 is arranged in the containing cavity 1a, the box 1 comprises the first box wall 13 and the second box wall 14 which are adjacent and participate in defining the containing cavity 1a, the first box wall 13 is the bottom wall, the second box wall 14 is the side wall and is a plurality of, the plurality of second box walls 14 are arranged around the periphery of the first box wall 13, so that the first box wall 13 and the plurality of second box walls 14 jointly define at least part of the containing cavity 1a.

[0133] The first box wall 13 and the second box wall 14 are separate parts, and the materials thereof are different, the first box wall 13 is a composite material plate, and the second box wall 14 is a metal sheet part; the first box wall 13 comprises the main body part 132 and a plurality of first lap joints 131, the plurality of first lap joints 131 are sequentially connected end to end and arranged around the periphery of the main body part 132, the plurality of first lap joints 131 and the main body part 132 define the first groove 13a, the opening of the first groove 13a is arranged upward, and the second adhesive part 102 is arranged in the first groove 13a, and the second adhesive part 102 fixedly connects the main body part 132 and the battery cell 101.

[0134] The bottom of the second box wall 14 has the second lap joint 141, the second lap joint 141 is stacked on the lower side of the first lap joint 131, and the second lap joint 141 and the first lap joint 131 are fixedly connected by at least the first adhesive part 15.

[0135] The main body part 132 is formed with the second groove 1b, the opening 1c of the second groove 1b is arranged toward the containing cavity 1a to make the second groove 1b communicate with the containing cavity 1a, the first heat exchange member 2 is embedded in the second groove 1b, and the third adhesive part 104 is arranged between the first heat exchange member 2 and the groove wall of the second groove 1b to fixedly connect the first heat exchange member 2 and the first box wall 13; the first heat exchange member 2 is arranged in the containing cavity 1a, the upper surface of the first heat exchange member 2 is lower than the opening 1c of the second groove 1b, so that the part of the second groove 1b on the upper side of the first heat exchange member 2 forms the third groove 1f, the heat-conducting adhesive part 103 is arranged in the third groove 1f, and the heat-conducting adhesive part 103 is used to connect at least the first heat exchange member 2 and the battery cell 101. The first adhesive part 15, the second adhesive part 102, the heat-conducting adhesive part 103 and the third adhesive part 104 are all structural adhesives.

[0136] In the above technical solution, the battery 200 has simple structure, high integration, light weight and low cost.

[0137] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0138] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A box assembly, wherein, The box body has a containing cavity for containing battery cells, and comprises a first box wall and a second box wall which participate in defining the containing cavity, the first box wall and the second box wall are separate parts, the end of the first box wall has a first lap joint, the end of the second box wall has a second lap joint, the second lap joint is stacked on the first lap joint and connected, the first box wall is a bottom wall or a top wall, the second box wall is a side wall and is a plurality of side walls, the plurality of second box walls are connected in sequence and surround the periphery of the first box wall. At least one of the first box wall and the second box wall is provided with a first heat exchange member, the first heat exchange member is located in the containing cavity or outside the containing cavity, and the first heat exchange member is used for heat exchange with the battery cell. The material of the first box wall and the second box wall is different.

2. The box assembly of claim 1, wherein, The first box wall is a composite material part, and the second box wall is a metal part, which is a sheet metal part or a profile part.

3. The box assembly of claim 2, wherein, The first lap joint and the second lap joint are connected by at least one of adhesive fixing and threaded fastener fixing.

4. The box assembly of claim 2 or 3, wherein, The first lap joint is stacked on the upper side of the second lap joint.

5. The box assembly of any one of claims 1-4, wherein, The first box wall further comprises a main body part, a plurality of first lap joints are connected in sequence and surround the periphery of the main body part, each first lap joint is connected with the main body part by bending, so that the main body part and the plurality of first lap joints define a first recess, the first recess is used for containing a second adhesive, and the second adhesive is used for connecting the main body part and the battery cell.

6. The tank assembly of any one of claims 1-5, wherein, The box body assembly is configured to satisfy at least one of the following conditions:

7. The tank assembly of any one of claims 1-6, wherein, Condition A1: at least one first heat exchange member is integrally formed with the box body; Condition A2: at least one first heat exchange member is located in the containing cavity and is fixed to the box body by a third adhesive; Condition A3: at least one first heat exchange member is located outside the containing cavity and is fixed to the box body by a fourth adhesive. The first heat exchange member comprises at least one heat exchange pipe which defines a heat exchange flow channel and is a flat pipe or a harmonica pipe.

8. The tank assembly of any one of claims 1-7, wherein, At least one of the first box wall and the second box wall is formed with a second recess, and the first heat exchange member is embedded in the second recess of the first box wall and / or the second recess of the second box wall.

9. The tank assembly of any one of claims 1-8, wherein, The first heat exchange member is located in the containing cavity, the second recess has a slot opening, a slot bottom wall and a slot side wall, one end of the slot side wall away from the slot bottom wall defines the slot opening, and one side surface of the first heat exchange member away from the slot bottom wall is recessed relative to the slot opening and towards the slot bottom wall, so that the one side surface of the first heat exchange member away from the slot bottom wall and the slot side wall of the second recess define a third recess, the third recess is used for containing a heat-conducting adhesive, and the heat-conducting adhesive is used for connecting at least the first heat exchange member and the battery cell.

10. The box assembly of claim 9, wherein, The battery cell and the box body assembly according to any one of claims 1-10 are included, and the battery cell is arranged in the containing cavity.

11. A battery, wherein, Further comprising:

12. The battery of claim 11, wherein, ​ A second heat exchange member is arranged between two adjacent battery cells.

13. The battery of claim 11 or 12, wherein, A heat-conducting adhesive member is connected between the battery cell and the first heat exchange member, A first adhesive member is connected between the first lap joint and the second lap joint, and a thermal conductivity of the first adhesive member is less than that of the heat-conducting adhesive member; and / or, A second adhesive member is connected between the battery cell and the first box wall, and a thermal conductivity of the second adhesive member is less than that of the heat-conducting adhesive member; and / or, A third adhesive member is connected between the first box wall or the second box wall and the first heat exchange member located in the accommodating cavity, and a thermal conductivity of the third adhesive member is less than that of the heat-conducting adhesive member.

14. An electrical device, comprising: A battery comprising any one of the batteries according to claims 11-13.

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