Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a battery cell assembly, a box body and an end plate. The battery cell assembly includes a plurality of battery cells arranged along a first direction. The box body is used for containing a battery monomer assembly and comprises a first wall used for bearing the battery monomer assembly, the first wall is provided with a heat exchange flow channel, and the heat exchange flow channel is used for containing a heat exchange medium. The end plate is arranged in the box body, the end plate is connected to the first wall, the end plate is arranged at the end part of the battery monomer assembly along a first direction, and the first direction is vertical to the thickness direction of the first wall. The end plate is provided with a first surface facing the first wall, the first surface comprises a first area and a second area, the first area is connected with the first wall, and the second area and the first wall are arranged in a spaced mode in the thickness direction of the first wall. According to the technical scheme, the reliability of the battery device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, in particular to a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the development of battery technology, how to improve the reliability of the battery device is a technical problem that needs to be solved in battery technology. CONTENT OF THE INVENTION

[0004] The present application provides a battery device and a power utilization device, which can improve the reliability of the battery device.

[0005] The present application is realized by the following technical scheme:

[0006] In a first aspect, the present application provides a battery device. The battery device includes a battery monomer assembly, a box body and an end plate. The battery monomer assembly includes a plurality of battery monomers arranged along a first direction. The box body is used to accommodate the battery monomer assembly, and the box body includes a first wall for bearing the battery monomer assembly, the first wall having a heat exchange channel for accommodating a heat exchange medium. The end plate is arranged in the box body and is connected to the first wall. In the first direction, the end plate is arranged at the end of the battery monomer assembly, and the first direction is perpendicular to the thickness direction of the first wall. The end plate has a first surface facing the first wall, the first surface including a first region and a second region, the first region being connected to the first wall, and the second region being arranged spaced apart from the first wall in the thickness direction of the first wall.

[0007] The technical scheme of the embodiment of the application is that the charging and discharging performance of the battery device is affected by temperature, a heat exchange flow channel is arranged on the first wall bearing the battery monomer assembly, and a heat exchange medium is contained in the heat exchange flow channel, which is beneficial to heat exchange of the plurality of battery monomers with the heat exchange medium through the first wall, and reduces the risk that the battery monomer assembly is affected by high or low temperature to affect the charging and discharging performance of the battery device. Meanwhile, the first surface of the end plate facing the first wall is divided into a first region and a second region, and the second region is arranged in a spaced manner with the first wall. Since the second region is not in direct contact with the first wall, the heat exchange efficiency of the end plate and the first wall is reduced, so that the battery monomers close to the end plate have a lower heat exchange efficiency with the first wall, that is, the main heat exchange path of the battery monomers close to the end plate is the same as that of other battery monomers, that is, direct heat exchange with the first wall, thereby reducing the temperature difference between the battery monomers close to the end plate and other battery monomers. The temperature adjustment of the battery monomer assembly by the battery device depends on the battery monomer with the highest or lowest temperature in the plurality of battery monomers, the temperature difference between each battery monomer is small, the temperature adjustment of the battery monomer assembly is accurate, the charging and discharging performance of the battery device is improved, and the reliability of the battery device is improved.

[0008] In some embodiments, the first wall is provided with a threaded hole, the first region is provided with a through hole corresponding to the threaded hole, and the battery device further comprises a connecting piece, the connecting piece passes through the through hole and is connected with the threaded hole.

[0009] The technical scheme of the embodiment of the application is that the first region and the first wall are connected through the connecting piece, the connection of the end plate and the first wall is realized, and the operation is simple and convenient for disassembly.

[0010] In some embodiments, in the thickness direction of the first wall, the distance between the first region and the second region is d, and d satisfies: d>=1mm.

[0011] The technical scheme of the embodiment of the application is that in the thickness direction of the first wall, the distance between the first region and the second region satisfies the above condition, that is, the distance between the second region and the first wall satisfies the above condition in the thickness direction of the first wall, the heat exchange effect of the second region and the first wall is reduced, the temperature difference between the battery monomers close to the end plate and other battery monomers is reduced, and the reliability of the battery device is improved.

[0012] In some embodiments, d<=2mm.

[0013] The technical scheme of the embodiment of the application is that the battery monomer assembly is arranged on the first wall and is bonded by glue, in the thickness direction of the first wall, the distance between the first region and the second region satisfies the above condition, that is, the distance between the second region and the first wall satisfies the above condition in the thickness direction of the first wall, the risk of overflow of the glue from the second region and the first wall is reduced, the risk of connection failure of the first wall and the battery monomer assembly is reduced, and the reliability of the battery device is improved.

[0014] In some embodiments, the material of the end plate is the same as that of the first wall.

[0015] The technical scheme of the embodiments of the present application, the first wall bears the battery monomer assembly, and the material thereof has high strength. The material of the end plate is the same as that of the first wall, so that the end plate has high strength, the ability of the end plate to resist the expansion force of the battery monomer assembly is improved, and the reliability of the battery device is improved.

[0016] In some embodiments, the first wall comprises a medium inlet and a medium outlet, both of which are in communication with the heat exchange channel. In the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the medium inlet and the orthographic projection of the medium outlet are both located on the side of the orthographic projection of the end plate away from the orthographic projection of the battery monomer assembly.

[0017] The technical scheme of the embodiments of the present application, the medium inlet and the medium outlet are arranged on the side of the end plate away from the battery monomer assembly, reducing the risk of interference between the medium inlet and the medium outlet and the battery monomer assembly. At the same time, the heat exchange medium flows out from the medium outlet through the end plate after being exchanged with the battery monomer assembly through the end plate from the medium inlet. Since the heat exchange medium at the medium inlet has not yet been exchanged with the battery monomer assembly, the heat exchange medium in the heat exchange channel corresponding to the part of the end plate adjacent to the medium inlet has not yet been exchanged with the battery monomer assembly. The heat exchange medium at the medium outlet has already been exchanged with the battery monomer assembly, that is, the heat exchange medium in the heat exchange channel corresponding to the part of the end plate adjacent to the medium inlet has already been exchanged with the battery monomer assembly. The temperature difference between the heat exchange medium in the heat exchange channel corresponding to the end plate and the heat exchange medium in the heat exchange channel corresponding to other battery monomers is large. The second region is arranged between the first wall, so that the temperature regulation of the battery monomer assembly is accurate, and the reliability of the battery device is improved.

[0018] In some embodiments, the number of first regions is multiple, and the multiple first regions are arranged in the second direction. The first direction, the thickness direction of the first wall, and the second direction are perpendicular to each other.

[0019] The technical scheme of the embodiments of the present application, the number of first regions is multiple, and the first region is used to connect with the first wall, that is, the end plate has multiple parts connected with the first wall, improving the reliability of the connection between the end plate and the first wall, and improving the reliability of the battery device.

[0020] In some embodiments, the number of first regions is two, and the two first regions are arranged at both ends of the first surface in the second direction.

[0021] The number of the first regions is two, so that the end plate and the first wall are connected with good reliability, and the first regions are arranged at two ends of the first surface in the second direction, that is, the second region is located between the two first regions and is a complete and continuous region, facilitating processing of the second region.

[0022] In some embodiments, the end plate has opposite second and third surfaces in the first direction, and the second region is connected to the second and third surfaces at two ends in the second direction.

[0023] The second region is connected to the second and third surfaces of the end plate in the first direction, that is, in the second direction, the size of the second region is the same as that of the end plate, so that the second region has a large area, reducing the temperature difference between the battery cells close to the end plate and other battery cells, and improving the reliability of the battery device.

[0024] In some embodiments, the battery device further comprises a heat insulation member, which is arranged between the first wall and the first region in the thickness direction of the first wall.

[0025] The heat insulation member is arranged between the first wall and the first region, reducing the heat exchange efficiency between the first region and the first wall, further reducing the temperature difference between the battery cells close to the end plate and other battery cells, and improving the reliability of the battery device.

[0026] In some embodiments, the first wall comprises a main body portion and a protruding portion, the heat exchange channel is arranged in the main body portion, and the main body portion is used to carry the battery cell assembly; the protruding portion is protruded on the surface of the main body portion facing the battery cell assembly, and is arranged between the end plate and the main body portion in the thickness direction of the first wall, and the first region is connected to the main body portion.

[0027] The protruding portion is arranged between the end plate and the main body portion, so that the main body portion carries the battery cell assembly, the protruding portion contacts one end of the battery cell assembly, improves the ability of the first wall to resist the expansion force of the battery cell assembly, and facilitates connection of the end plate and the first wall.

[0028] In some embodiments, the number of the end plates is two, and the two end plates are arranged at intervals in the first direction, and the plurality of battery cells are arranged between the two end plates.

[0029] The plurality of battery cells are arranged between the two end plates, improving the ability of the end plate to resist the expansion force of the battery cell assembly.

[0030] In some embodiments, the battery device further comprises a binding member, which cooperates with the end plate to clamp the plurality of battery cells.

[0031] The technical scheme of the embodiment of the application improves the ability of the end plate to resist the expansion force of the battery monomer assembly by cooperation of the binding member and the end plate to clamp the battery monomer assembly.

[0032] In some embodiments, the box body includes a bottom wall, a side wall and a box cover, the bottom wall and the box cover are oppositely arranged, one end of the side wall is surrounded by the outer periphery of the bottom wall, and the other end forms an opening, the box cover closes the opening, the bottom wall, the side wall and the box cover jointly define a containing cavity for containing the battery monomer assembly, and the bottom wall is a first wall.

[0033] The technical scheme of the embodiment of the application sets a heat exchange flow channel in the bottom wall, the plurality of battery monomers exchange heat with the bottom wall, the efficiency of heat exchange between the end plate and the heat exchange medium through the bottom wall is reduced, and the reliability of the battery device is improved.

[0034] In a second aspect, the application further provides a power utilization device, which comprises the battery device of any one of the embodiments of the first aspect, and the battery device is used to provide electric energy.

[0035] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical scheme of the embodiments of the application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0037] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the application;

[0038] Figure 2 The exploded view of a battery device is provided for some embodiments of the application;

[0039] Figure 3 The schematic diagram of a battery monomer assembly is provided for some embodiments of the application;

[0040] Figure 4 The partial structural schematic diagram of a battery device is provided for some embodiments of the application;

[0041] Figure 5 The schematic diagram of the connection between an end plate and a first wall is provided for some embodiments of the application;

[0042] Figure 6 The enlarged view of A in FIG. Figure 5

[0043] Figure 7 ​A schematic view of an end plate provided for some embodiments of the present application;

[0044] Figure 8 A schematic view of a first wall provided for some embodiments of the present application;

[0045] Figure 9 A schematic view of the connection of an end plate and a first wall provided for some embodiments of the present application.

[0046] Figure: 1-battery device; 10-battery monomer assembly; 11-battery monomer; 20-box; 21-first wall; 211-heat exchange channel; 212-thread hole; 213-medium inlet; 214-medium outlet; 215-main body; 216-protruding part; 22-first sub-box; 23-second sub-box; 24-bottom wall; 25-side wall; 26-box cover; 27-opening; 28-holding cavity; 30-end plate; 31-first surface; 311-first area; 3111-through hole; 312-second area; 32-second surface; 33-third surface; 40-connector; 50-thermal insulation part; 60-bundling part; 100-vehicle; 110-controller; 120-motor; X-first direction; Y-thickness direction of the first wall; Z-second direction. DETAILED DESCRIPTION

[0047] In order to make the objects, 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 and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, 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.

[0048] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover not exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0049] Reference within this application 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 an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be combined with any of the other embodiments unless explicitly stated otherwise.

[0050] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0051] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or the second direction, which means that there are three cases of A alone, A and the second direction, and the second direction alone. In addition, the character " / " in this application generally represents that the front and rear associated objects are in an "or" relationship.

[0052] "Multiple" appearing in this application means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0053] The battery apparatus mentioned in the embodiments of the application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel, or mixed connection through a busbar component.

[0054] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0055] In some embodiments, the battery apparatus can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0056] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0057] As an example, the battery cell assembly can also be accommodated in the box by fixing a plurality of battery cells directly to the box.

[0058] As an example, the box can include a first sub-box and a second sub-box. The first sub-box and the second sub-box are fastened so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first sub-box can be a top cover or a bottom plate.

[0059] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0060] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0061] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0062] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0063] The battery cell can be, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0064] The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, and other performance parameters. In addition, the reliability of the battery device is also one of the key factors to be considered as the environmental conditions and / or the internal conditions of the battery change.

[0065] At present, the battery cell assembly is arranged in the box and carried on the first wall, thereby forming a battery device. The end plate is arranged at one end of the battery cell assembly and connected with the wall of the box, and is used for resisting the expansion force. The first wall is provided with a heat exchange channel, and the heat exchange channel is used for heat exchange with the battery cell assembly. When the temperature of the battery cell assembly is low, the heat exchange channel heats the battery cell assembly; when the temperature of the battery cell assembly is high, the heat exchange channel cools the battery cell assembly.

[0066] However, the end plate is connected to the first wall. When the heat exchange medium in the heat exchange flow channel exchanges heat with the battery cell assembly, the battery cell close to the end plate exchanges heat directly through the first wall and exchanges heat indirectly through the end plate and the first wall, so that the battery cell close to the end plate exchanges heat more efficiently than the other battery cells, and the temperature of the battery cell close to the end plate decreases or increases faster.

[0067] Generally, the condition for the battery device to start heat exchange depends on the battery cell with the highest or lowest temperature in the battery cell assembly. Therefore, when the battery cell assembly cools down, the battery cell close to the end plate cools down fastest, so that the temperature of the battery cell close to the end plate is lower, and the battery device stops cooling based on the temperature of the battery cell, resulting in that the temperature of the other battery cells does not decrease to the ideal temperature. When the battery cell assembly heats up, the battery cell close to the end plate heats up fastest, so that the temperature of the battery cell close to the end plate is higher, and the battery device stops heating based on the temperature of the battery cell, resulting in that the temperature of the other battery cells does not increase to the ideal temperature. Therefore, due to the large temperature difference between the battery cell close to the end plate and the other battery cells, the heat exchange of the battery cell assembly cannot be carried out normally, resulting in that the temperature of the battery cell is too high or too low, thereby affecting the charging and discharging performance and the battery life, and causing poor reliability of the battery device.

[0068] Based on the above consideration, in order to solve the problem that the temperature difference between each battery cell in the battery cell assembly is large, thereby affecting the reliability of the battery device, the embodiments of the present application provide a battery device. The battery device comprises a battery cell assembly, a box body and an end plate. The battery cell assembly comprises a plurality of battery cells arranged along a first direction. The box body is used for accommodating the battery cell assembly, and the box body comprises a first wall used for bearing the battery cell assembly, and the first wall has a heat exchange flow channel used for accommodating a heat exchange medium. The end plate is arranged in the box body and is connected to the first wall. In the first direction, the end plate is arranged at the end of the battery cell assembly, and the first direction is perpendicular to the thickness direction of the first wall. The end plate has a first surface facing the first wall, and the first surface comprises a first region and a second region. The first region is connected to the first wall, and the second region is arranged in a spaced manner with the first wall in the thickness direction of the first wall.

[0069] By dividing the first surface of the end plate facing the first wall into the first region and the second region, and arranging the second region in a spaced manner with the first wall, since the second region is not in direct contact with the first wall, the heat exchange efficiency of the end plate and the first wall is reduced, so that the heat exchange efficiency of the battery cell close to the end plate through the end plate and the first wall is low, the temperature difference between the battery cell close to the end plate and the other battery cells is reduced, the heat exchange of the battery cell assembly can be carried out normally, and the reliability of the battery device is improved.

[0070] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers and battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., for example, spacecraft including airplanes, rockets, space shuttles and spaceships, etc.

[0071] The following embodiments are described for convenience with a vehicle as an example of an electric device in an embodiment of the present application.

[0072] Please refer to Figure 1 , Figure 1 The structural schematic diagram of the vehicle provided in some embodiments of the present application. The vehicle 100 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended range car, etc. The vehicle 100 is internally provided with a battery device 1, which can be arranged at the bottom, head or tail of the vehicle 100. The battery device 1 can be used for power supply of the vehicle 100, for example, the battery device 1 can be used as the operating power source of the vehicle 100, which is used for the circuit system of the vehicle 100, for example, for the working power demand of the vehicle 100 during starting, navigation and running.

[0073] The vehicle 100 can also include a controller 110 and a motor 120, and the controller 110 is used to control the battery device 1 to supply power to the motor 120, for example, for the working power demand of the vehicle 100 during starting, navigation and running.

[0074] In some embodiments of the present application, the battery device 1 can not only be used as the operating power source of the vehicle 100, but also be used as the driving power source of the vehicle 100, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 100.

[0075] The battery device includes a battery monomer assembly and a power management system, and the battery management system is connected with the battery monomer assembly and is used for managing the charging and discharging of the battery monomer assembly.

[0076] Please refer to Figure 2 , Figure 2An exploded view of a battery device provided for some embodiments of the present application. The battery device 1 can further include a box 20, in which the battery cell assembly 10 is accommodated. The box 20 is configured to provide an accommodation space for the battery cell assembly 10, and the box 20 can have various structures. In some embodiments, the box 20 can include a first sub-box 22 and a second sub-box 23, the first sub-box 22 and the second sub-box 23 are overlapped with each other, and the first sub-box 22 and the second sub-box 23 together define an accommodation space for accommodating the battery cell assembly 10. The first sub-box 22 can be a hollow structure with one end open, and the second sub-box 23 can be a plate structure, which is overlapped with the open end of the first sub-box 22 to define the accommodation space together with the first sub-box 22. Alternatively, the first sub-box 22 and the second sub-box 23 can both be hollow structures with one side open, and the open side of the first sub-box 22 is overlapped with the open side of the second sub-box 23.

[0077] In the battery device 1, the battery cell assembly 10 can be multiple, and the multiple battery cell assemblies 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cell assemblies 10 are connected in series and in parallel. The multiple battery cell assemblies 10 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cell assemblies 10 is accommodated in the box 20. Alternatively, the multiple battery cell assemblies 10 can be connected in series, in parallel, or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 20. The battery device 1 can further include other structures, for example, the battery device 1 can further include a current collecting component for electrically connecting the multiple battery cell assemblies 10.

[0078] The battery cell assembly 10 can include multiple battery cells, and the battery cell can be a secondary battery or a primary battery. The battery cell can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0079] Please refer to Figure 2 , and refer to Figures 3 to 6 , Figure 3 A schematic view of a battery cell assembly provided for some embodiments of the present application, Figure 4 A partial structure schematic view of a battery device provided for some embodiments of the present application, Figure 5 A schematic view of a connection between an end plate and a first wall provided for some embodiments of the present application, Figure 6 Figure 5 ​An enlarged view of A in FIG. 1. Embodiments of the present application provide a battery device 1. The battery device 1 includes a battery cell assembly 10, a case 20, and an end plate 30. The battery cell assembly 10 includes a plurality of battery cells 11 arranged along a first direction X. The case 20 is configured to accommodate the battery cell assembly 10, and includes a first wall 21 configured to support the battery cell assembly 10, the first wall 21 having a heat exchange flow channel 211 configured to accommodate a heat exchange medium. The end plate 30 is disposed in the case 20, and is connected to the first wall 21, the end plate 30 being disposed at an end of the battery cell assembly 10 along the first direction X, the first direction X being perpendicular to a thickness direction Y of the first wall. The end plate 30 has a first surface 31 facing the first wall 21, the first surface 31 including a first region 311 connected to the first wall 21 and a second region 312 spaced apart from the first wall 21 in the thickness direction Y of the first wall.

[0080] In some embodiments, the first wall 21 can be a bottom wall of the case 20. When the battery device 1 is installed on a vehicle 100, the first wall 21 is a wall below the case 20.

[0081] In some embodiments, the first direction X can be represented by the direction indicated by the letter X in the figure.

[0082] In some embodiments, the first direction X can be a length direction of the battery device 1.

[0083] In some embodiments, the first wall 21 is provided with the heat exchange flow channel 211, which can be a flow channel hollowed inside the first wall 21.

[0084] In some embodiments, the heat exchange medium can be a liquid medium, a gas medium, or the like.

[0085] In some embodiments, the heat exchange medium can be a cooling medium.

[0086] In some embodiments, the heat exchange medium can be a heating medium.

[0087] In some embodiments, the end plate 30 can be disposed at one end of the battery cell assembly 10 along the first direction X, and one end of the end plate 30 facing the first wall 21 is connected to the first wall 21.

[0088] In some embodiments, the thickness direction Y of the first wall can be represented by the direction indicated by the letter Y in the figure.

[0089] In some embodiments, the thickness direction Y of the first wall can be a height direction of the battery device 1.

[0090] In some embodiments, the thickness direction Y of the first wall can be perpendicular to the first direction X.

[0091] In some embodiments, one end of the end plate 30 is connected to the first wall 21 in the thickness direction Y of the first wall. The surface of the end plate 30 facing the first wall 21 is the first surface 31. The first wall 21 may be the bottom wall of the box body 20, and the first surface 31 may be the lower surface of the end plate 30 in the thickness direction Y of the first wall.

[0092] In some embodiments, the first surface 31 includes a first region 311 and a second region 312. The first region 311 is connected to the first wall 21, thereby connecting the end plate 30 to the first wall 21. The second region 312 is spaced apart from the first wall 21. That is, in the thickness direction Y of the first wall, the second region 312 does not contact the first wall 21, thereby reducing the heat exchange efficiency between the second region 312 and the first wall 21.

[0093] In some embodiments, the end plate 30 may be formed in an integral manner, where a first surface 31 having a first area 311 and a second area 312 is formed by a mold.

[0094] In some embodiments, the end plate 30 may be formed as an integral piece and then machined to form the first surface 31 having the first area 311 and the second area 312 .

[0095] According to the technical solution of the embodiment of the present application, the charge and discharge performance of the battery device 1 is affected by temperature. A heat exchange channel 211 is provided on the first wall 21 supporting the battery cell assembly 10. The heat exchange channel 211 contains a heat exchange medium, facilitating heat exchange between the multiple battery cells 11 and the heat exchange medium through the first wall 21, thereby reducing the risk of the battery cell assembly 10 being affected by high or low temperatures affecting the charge and discharge performance of the battery device 1. Furthermore, the first surface 31 of the end plate 30 facing the first wall 21 is divided into a first region 311 and a second region 312. The second region 312 is spaced apart from the first wall 21. Since the second region 312 is not in direct contact with the first wall 21, the heat exchange efficiency between the end plate 30 and the first wall 21 is reduced, resulting in a lower heat exchange efficiency between the battery cells 11 near the end plate 30 and the first wall 21. In other words, the primary heat exchange pathway for the battery cells 11 near the end plate 30 is the same as that for the other battery cells 11: direct heat exchange with the first wall 21. This reduces the temperature difference between the battery cells 11 near the end plate 30 and the other battery cells 11. The battery device 1 regulates the temperature of the battery cell assembly 10 based on the battery cell 11 with the highest or lowest temperature among the multiple battery cells 11. The temperature difference between the battery cells 11 is small, so that the temperature of the battery cell assembly 10 can be accurately regulated, which facilitates improving the charging and discharging performance of the battery device 1, thereby improving the reliability of the battery device 1.

[0096] Please refer to Figure 4 and Figure 5And refer to Figure 7 And Figure 8 , Figure 7 A schematic view of an end plate provided for some embodiments of the present application, Figure 8 A schematic view of a first wall provided for some embodiments of the present application. In some embodiments, the first wall 21 is provided with a threaded hole 212, the first region 311 is provided with a through hole 3111 corresponding to the threaded hole 212, and the battery device 1 further comprises a connecting piece 40 which passes through the through hole 3111 and is connected with the threaded hole 212.

[0097] In some embodiments, the connecting piece 40 can be a bolt, a screw, etc.

[0098] In some embodiments, in the thickness direction Y of the first wall, the threaded hole 212 and the through hole 3111 can correspond, so that the connecting piece 40 can be locked to the threaded hole 212 after passing through the through hole 3111, realizing the connection of the end plate 30 and the first wall 21.

[0099] In some embodiments, the through hole 3111 can be understood as a hole extending from one surface of the end plate 30 to the first surface 31 in the thickness direction Y of the first wall.

[0100] In some embodiments, the through hole 3111 and the threaded hole 212 can both extend along the thickness direction Y of the first wall.

[0101] In some embodiments, a groove can be provided on the surface adjacent to the first surface 31, and in the thickness direction Y of the first wall, the through hole 3111 can extend from the wall surface of the groove to the first region 311 of the first surface 31.

[0102] In some embodiments, in the thickness direction Y of the first wall, the through hole 3111 can extend from the surface opposite to the first surface 31 to the first region 311 of the first surface 31.

[0103] The technical scheme of the embodiments of the present application realizes the connection of the end plate 30 and the first wall 21 by connecting the first region 311 and the first wall 21 through the connecting piece 40, which is simple to operate and convenient to disassemble.

[0104] Please refer to Figure 6 In some embodiments, in the thickness direction Y of the first wall, the distance between the first region 311 and the second region 312 is d, which satisfies: d≥1mm.

[0105] In some embodiments, in the thickness direction Y of the first wall, the distance between the first region 311 and the second region 312, that is, the distance between the second region 312 and the first wall 21, is arranged in the thickness direction Y of the first wall.

[0106] In some embodiments, the distance between the first region 311 and the second region 312 in the thickness direction Y of the first wall is d, and d satisfies the above condition. The value of d can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, or a value between any two of the above values, but is not limited thereto.

[0107] It should be noted that the distance between the first region 311 and the second region 312 in the thickness direction Y of the first wall should be less than the size of the end plate 30 in the thickness direction Y of the first wall.

[0108] The technical solution of the embodiments of the present application reduces the heat exchange effect between the second region 312 and the first wall 21, reduces the temperature difference between the battery monomer 11 close to the end plate 30 and other battery monomers 11, and improves the reliability of the battery device 1.

[0109] Please refer to Figure 6 In some embodiments, d≤2 mm.

[0110] In some embodiments, the distance between the first region 311 and the second region 312 in the thickness direction Y of the first wall is d, and d satisfies the above condition. The value of d can be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, or a value between any two of the above values.

[0111] The technical solution of the embodiments of the present application reduces the risk of overflow of glue from between the second region 312 and the first wall 21, reduces the risk of connection failure of the first wall 21 and the battery monomer assembly 10, and improves the reliability of the battery device 1.

[0112] In some embodiments, the material of the end plate 30 is the same as the material of the first wall 21.

[0113] In some embodiments, the material of the end plate 30 and the material of the first wall 21 can both be metal materials, such as aluminum, alloy, iron, etc.

[0114] The first wall 21 is used to bear the battery monomer assembly 10 and resist the expansion force generated by the battery monomer assembly 10 during charging and discharging, and thus needs to have strong strength. Meanwhile, the end plate 30 is used to clamp the battery monomer assembly 10 and also needs to resist the expansion force generated by the battery monomer assembly 10 during charging and discharging, and thus also needs to have strong strength. In some embodiments, the materials of the end plate 30 and the first wall 21 can both be metal aluminum.

[0115] The technical scheme of the embodiments of the present application is that the first wall 21 bears the battery monomer assembly 10 and has high strength, and the material of the end plate 30 is the same as that of the first wall 21, so that the end plate 30 has high strength, improves the ability of the end plate 30 to resist the expansion force of the battery monomer assembly 10, and improves the reliability of the battery device 1.

[0116] Please refer to Figure 4 and Figure 8 In some embodiments, the first wall 21 includes a medium inlet 213 and a medium outlet 214, both of which are in communication with the heat exchange flow channel 211. In the same projection plane perpendicular to the thickness direction Y of the first wall, the orthographic projection of the medium inlet 213 and the orthographic projection of the medium outlet 214 are both located on the side of the orthographic projection of the end plate 30 that is away from the orthographic projection of the battery monomer assembly 10.

[0117] In some embodiments, the medium inlet 213 and the medium outlet 214 are in communication with the heat exchange flow channel 211. The heat exchange medium flows in from the medium inlet 213, exchanges heat with the battery monomer assembly 10 through the heat exchange flow channel 211, and then flows out through the medium outlet 214 after heat exchange.

[0118] In some embodiments, in the projection direction of the thickness direction Y of the first wall, the projection of the battery monomer assembly 10 does not intersect with the projection of the medium inlet 213 and the projection of the medium outlet 214. That is, the medium inlet 213 and the medium outlet 214 are arranged at the part of the first wall 21 that does not contact the battery monomer assembly 10.

[0119] In some embodiments, the heat exchange medium is taken as an example of the cooling medium. The heat exchange medium enters the heat exchange flow channel 211 through the medium inlet 213, and after passing through the region corresponding to the first part of the end plate 30, flows to the region corresponding to the battery monomer assembly 10. At this time, the temperature of the heat exchange medium corresponding to this part of the end plate 30 is close to the temperature of the heat exchange medium at the medium inlet 213, and the temperatures of the heat exchange medium at the two places are both low.

[0120] The heat exchange medium flows through the battery monomer assembly 10, exchanges heat with the battery monomer assembly 10, and then flows to the medium outlet 214 through another part of the end plate 30. At this time, the temperature of the heat exchange medium corresponding to the part of the end plate 30 is close to the temperature of the heat exchange medium at the medium outlet 214, and the temperatures of the heat exchange medium at the two places are both high.

[0121] Similarly, taking the heat exchange medium as an example of the heating medium. The heat exchange medium enters the heat exchange channel 211 through the medium inlet 213, and then flows to the area corresponding to the battery monomer assembly 10 through the area corresponding to the first part of the end plate 30 in the heat exchange channel 211. At this time, the temperature of the heat exchange medium corresponding to the part of the end plate 30 is close to the temperature of the heat exchange medium at the medium inlet 213, and the temperatures of the heat exchange medium at the two places are both high.

[0122] The heat exchange medium flows through the battery monomer assembly 10, exchanges heat with the battery monomer assembly 10, and then flows to the medium outlet 214 through another part of the end plate 30. At this time, the temperature of the heat exchange medium corresponding to the part of the end plate 30 is close to the temperature of the heat exchange medium at the medium outlet 214, and the temperatures of the heat exchange medium at the two places are both low.

[0123] Therefore, the second area 312 is arranged to be spaced apart from the first wall 21, so that the heat exchange efficiency of the heat exchange medium corresponding to the two parts of the end plate 30 is low, thereby reducing the heat exchange efficiency of the battery monomer 11 adjacent to the end plate 30 in the battery monomer assembly 10 and the heat exchange medium.

[0124] The technical scheme of the embodiment of the application is that the medium inlet 213 and the medium outlet 214 are arranged on the side of the end plate 30 away from the battery monomer assembly 10, thereby reducing the risk of interference between the medium inlet 213 and the medium outlet 214 and the battery monomer assembly 10. Meanwhile, the heat exchange medium exchanges heat with the battery monomer assembly 10 through the end plate 30 after entering the medium inlet 213, and then flows out of the medium outlet 214 through the end plate 30. Since the heat exchange medium at the medium inlet 213 has not exchanged heat with the battery monomer assembly 10, the heat exchange medium in the heat exchange channel 211 corresponding to the part of the end plate 30 adjacent to the medium inlet 213 has not exchanged heat with the battery monomer assembly 10. The heat exchange medium at the medium outlet 214 has finished exchanging heat with the battery monomer assembly 10, the heat exchange medium in the heat exchange channel 211 corresponding to the part of the end plate 30 adjacent to the medium inlet 213 has finished exchanging heat with the battery monomer assembly 10, and the temperature difference between the heat exchange medium in the heat exchange channel 211 corresponding to the end plate 30 and the heat exchange medium in the heat exchange channel 211 corresponding to the other battery monomer 11 is large. The second area 312 is arranged to be spaced apart from the first wall 21, so that the temperature regulation of the battery monomer assembly 10 is accurate, and the reliability of the battery device 1 is improved.

[0125] Please refer to Figure 4 and Figure 7In some embodiments, the number of the first regions 311 is multiple, and the multiple first regions 311 are arranged at intervals along the second direction Z, and the first direction X, the thickness direction Y of the first wall, and the second direction Z are perpendicular to each other.

[0126] In some embodiments, the number of the first regions 311 can be multiple, such as two, three, four, etc.

[0127] In some embodiments, the multiple first regions 311 can be arranged at intervals along the second direction Z. Correspondingly, the number of the second regions 312 can also be multiple to separate the multiple first regions 311. The two first regions 311 can be separated by the second region 312, or the two second regions 312 can be separated by the first region 311.

[0128] In some embodiments, the second direction Z can be represented by the direction shown by the letter Z in the figure.

[0129] In some embodiments, the second direction Z can be the width direction of the battery device 1, and the first direction X, the second direction Z, and the second direction Z can be perpendicular to each other.

[0130] The technical scheme of the embodiments of the present application, the number of the first regions 311 is multiple, and the first regions 311 are used to connect with the first wall 21, that is, the end plate 30 has multiple parts connected with the first wall 21, improving the reliability of the connection between the end plate 30 and the first wall 21, and improving the reliability of the battery device 1.

[0131] Please refer to Figure 4 and Figure 7 In some embodiments, the number of the first regions 311 is two, and the two first regions 311 are arranged at two ends of the first surface 31 in the second direction Z.

[0132] In some embodiments, the number of the first regions 311 can be two, and in the second direction Z, the two first regions 311 are located at two ends of the first surface 31, that is, the number of the second regions 312 can be one, and one second region 312 is located between the two first regions 311. Or, taking the first direction X as the projection direction, a part of the second region 312 is projected to overlap with the projection of the first region 311, that is, a part of the second region 312 is located at one end or both ends of the first region 311 in the first direction X. In the second direction Z, another part of the second region 312 is located between the two second regions 312.

[0133] The technical scheme of the embodiment of the present application is that the number of the first regions 311 is two, so that the connection of the end plate 30 and the first wall 21 has better reliability, and meanwhile, the first regions 311 are arranged at two ends of the first surface 31 in the second direction Z, that is, the second region 312 is located between the two first regions 311 and is a complete and continuous region, facilitating the processing of the second region 312.

[0134] Please refer to Figure 7 In some embodiments, the end plate 30 has opposite second and third surfaces 32 and 33 in the first direction X, and the second region 312 is connected to the second and third surfaces 32 and 33 at two ends in the second direction Z.

[0135] In some embodiments, the end plate 30 has second and third surfaces 32 and 33 in the first direction X, and the second surface 32 can be closer to the battery monomer assembly 10 than the third surface 33. The second surface 32 can be in contact with the battery monomer assembly 10.

[0136] In some embodiments, the second region 312 is connected to the second and third surfaces 32 and 33 at two ends in the second direction Z, that is, in the second direction Z, the size of the second region 312 is the same as that of the first surface 31.

[0137] The technical scheme of the embodiment of the present application is that the second region 312 is connected to the second and third surfaces 32 and 33 of the end plate 30 in the first direction X, that is, in the second direction Z, the size of the second region 312 is the same as that of the end plate 30, so that the second region 312 has a larger area, reducing the temperature difference between the battery monomer 11 close to the end plate 30 and other battery monomers 11, and improving the reliability of the battery device 1.

[0138] Please refer to Figure 9 , Figure 9 The end plate and the first wall are connected as shown in the schematic view provided by another embodiment of the present application. In some embodiments, the battery device 1 further comprises a heat insulation piece 50, which is arranged between the first wall 21 and the first region 311 in the thickness direction Y of the first wall.

[0139] In some embodiments, the material of the heat insulation piece 50 can be epoxy resin material, which has good heat resistance and heat insulation, and also has good insulation, so as to realize the insulation between the first wall 21 and the end plate 30.

[0140] The technical scheme of the embodiment of the present application is that the heat insulation piece 50 is arranged between the first wall 21 and the first region 311, reducing the heat exchange efficiency between the first region 311 and the first wall 21, further reducing the temperature difference between the battery monomer 11 close to the end plate 30 and other battery monomers 11, and improving the reliability of the battery device 1.

[0141] Please refer to Figure 4 , Figure 5 and Figure 8 In some embodiments, the first wall 21 comprises a main body part 215 and a protruding part 216, the heat exchange channel 211 is arranged on the main body part 215, and the main body part 215 is used to bear the battery monomer assembly 10; the protruding part 216 is protruded on the surface of the main body part 215 facing the battery monomer assembly 10, and the protruding part 216 is arranged between the end plate 30 and the main body part 215 along the thickness direction Y of the first wall, and the first area 311 is connected with the main body part 215.

[0142] In some embodiments, the main body part 215 and the protruding part 216 can be integrally formed, or the main body part 215 and the protruding part 216 are respectively formed, and then the protruding part 216 is connected to the main body part 215 by welding or bolt locking.

[0143] In some embodiments, the protruding part 216 can be an expansion beam in the battery device 1. In the first direction X, the protruding part 216 is in contact with one end of the battery monomer assembly 10, and is used to resist the expansion force of the battery monomer assembly 10.

[0144] In some embodiments, the protruding part 216 is arranged between the end plate 30 and the main body part 215 along the thickness direction Y of the first wall. That is, the end plate 30 is connected to the protruding part 216 to realize the connection of the end plate 30 and the first wall 21.

[0145] It can be understood that the protruding part 216 connects the end plate 30, the first area 311 of the end plate 30 is connected with the protruding part 216, and the second area 312 is arranged in a spaced manner with the protruding part 216. The threaded hole 212 is arranged on the protruding part 216, and the connecting piece 40 passes through the through hole 3111 and is connected with the threaded hole 212.

[0146] The technical scheme of the embodiment of the application is that the protruding part 216 is arranged between the end plate 30 and the main body part 215, so that the main body part 215 bears the battery monomer assembly 10, the protruding part 216 is in contact with one end of the battery monomer assembly 10, the ability of the first wall 21 to resist the expansion force of the battery monomer assembly 10 is improved, and the connection of the end plate 30 and the first wall 21 is facilitated.

[0147] Please refer to Figure 3 In some embodiments, the number of end plates 30 is two, and the two end plates 30 are arranged in a spaced manner along the first direction X, and a plurality of battery monomers 11 are arranged between the two end plates 30.

[0148] In some embodiments, the number of end plates 30 is two, and the two end plates 30 are arranged at two ends of the battery monomer assembly 10 in the first direction X to clamp the battery monomer assembly 10.

[0149] In some embodiments, the structures of the two end plates 30 may be the same, that is, the first surfaces 31 of the two end plates 30 both have a first area 311 and a second area 312 , and the structures of the first area 311 and the second area 312 of the two end plates 30 may be the same.

[0150] In some embodiments, the structures of the two end plates 30 may be different, that is, the structures of the first region 311 and the second region 312 of the two end plates 30 may be different.

[0151] Correspondingly, the first wall 21 may include a main body 215 and two protrusions 216 , one protrusion 216 being connected to one end plate 30 , and the other protrusion 216 being connected to the other end plate 30 .

[0152] In the technical solution of the embodiment of the present application, a plurality of battery cells 11 are disposed between two end plates 30 , thereby improving the ability of the end plates 30 to resist the expansion force of the battery cell assembly 10 .

[0153] Please refer to Figure 3 In some embodiments, the battery device 1 further includes a binding member 60 , which cooperates with the end plate 30 to clamp the plurality of battery cells 11 .

[0154] In some embodiments, the binding member 60 is disposed around the outer circumference of the battery cell assembly 10 and contacts the end surface of the end plate 30 facing away from the battery cell assembly 10 to clamp the plurality of battery cells 11 .

[0155] The technical solution of the embodiment of the present application is to clamp the battery cell assembly 10 by the binding member 60 and the end plate 30, thereby improving the ability of the end plate 30 to resist the expansion force of the battery cell assembly 10.

[0156] Please refer to Figure 2 In some embodiments, the box body 20 includes a bottom wall 24, a side wall 25 and a box cover 26. The bottom wall 24 and the box cover 26 are arranged opposite to each other. One end of the side wall 25 is arranged around the outer periphery of the bottom wall 24, and the other end forms an opening 27. The box cover 26 closes the opening 27. The bottom wall 24, the side wall 25 and the box cover 26 jointly define a accommodating cavity 28 for accommodating the battery cell assembly 10. The bottom wall 24 is the first wall 21.

[0157] In some embodiments, the bottom wall 24 may be the first wall 21 , and the bottom wall 24 and the box cover 26 may be disposed opposite to each other along the thickness direction Y of the first wall.

[0158] In some embodiments, in the thickness direction Y of the first wall, one end of the side wall 25 is disposed around the outer periphery of the bottom wall 24 .

[0159] In some embodiments, the side wall 25 is arranged behind the bottom wall 24, the battery monomer assembly 10 and the end plate 30 can be put into the containing cavity 28 through the opening 27, and the opening 27 is closed by the box cover 26.

[0160] The technical scheme of the embodiment of the application is that the heat exchange flow channel 211 is arranged on the bottom wall 24, the plurality of battery monomers 11 exchange heat with the bottom wall 24, the efficiency of heat exchange between the end plate 30 and the heat exchange medium through the bottom wall 24 is reduced, and the reliability of the battery device 1 is improved.

[0161] The embodiment of the application also provides a power utilization device, which comprises the battery device 1 of any of the above embodiments, and the battery device 1 is used to provide electric energy.

[0162] Please refer to Figures 2 to 6 In some embodiments, the battery device 1 comprises the battery monomer assembly 10, the box 20 and the end plate 30. The battery monomer assembly 10 comprises a plurality of battery monomers 11 arranged along a first direction X. Along the first direction X, the end plate 30 is arranged at the end of the battery monomer assembly 10.

[0163] The box 20 is used to contain the battery monomer assembly 10, and the box 20 comprises a bottom wall 24, the bottom wall 24 comprises a main body part 215 and a protruding part 216, the heat exchange flow channel 211 is arranged on the main body part 215, and the main body part 215 is used to bear the battery monomer assembly 10. The protruding part 216 is arranged on the surface of the main body part 215 facing the battery monomer assembly 10, and along the thickness direction Y of the first wall, the protruding part 216 is arranged between the end plate 30 and the main body part 215, and the end plate 30 is connected with the main body part 215.

[0164] The end plate 30 has a first surface 31 facing the protruding part 216, the first surface 31 comprises a first area 311 and a second area 312, the first area 311 is connected with the protruding part 216, and along the thickness direction Y of the first wall, the second area 312 is arranged spaced apart from the protruding part 216.

[0165] The technical scheme of the embodiment of the application is that the first surface 31 of the end plate 30 facing the protruding part 216 is divided into the first area 311 and the second area 312, the second area 312 is arranged spaced apart from the protruding part 216, the heat exchange efficiency between the end plate 30 and the protruding part 216 is reduced, the heat exchange efficiency between the battery monomer 11 close to the end plate 30 and the protruding part 216 through the end plate 30 is low, the temperature difference between the battery monomer 11 close to the end plate 30 and other battery monomers 11 is reduced, the heat exchange of the battery monomer assembly 10 can be normally carried out, and the reliability of the battery device 1 is improved.

[0166] Although the present application has been described with reference to preferred embodiments, various modifications can be made to the application without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any way, provided that there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A battery cell assembly, comprising a plurality of battery cells arranged along a first direction; A box body for accommodating the battery cell assembly, the box body comprising a first wall for supporting the battery cell assembly, the first wall having a heat exchange flow channel, the heat exchange flow channel for accommodating a heat exchange medium; an end plate disposed in the box, the end plate being connected to the first wall and disposed at an end of the battery cell assembly along the first direction, the first direction being perpendicular to a thickness direction of the first wall; The end plate has a first surface facing the first wall, the first surface includes a first area and a second area, the first area is connected to the first wall, and the second area is spaced apart from the first wall in the thickness direction of the first wall.

2. The battery device according to claim 1, wherein: The first wall is provided with a threaded hole, the first area is provided with a through hole corresponding to the threaded hole, and the battery device further includes a connecting member passing through the through hole and connected to the threaded hole.

3. The battery device according to claim 1, wherein: In the thickness direction of the first wall, a distance d between the first region and the second region satisfies: d≥1 mm.

4. The battery device according to claim 3, characterized in that d≤2mm.

5. The battery device according to claim 1, wherein: The material of the end plate is the same as that of the first wall.

6. The battery device according to claim 1, wherein: The first wall includes a medium inlet and a medium outlet, both of which are connected to the heat exchange channel. On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the medium inlet and the orthographic projection of the medium outlet are both located on the side of the orthographic projection of the end plate that is away from the orthographic projection of the battery cell assembly.

7. The battery device according to claim 1, wherein: There are multiple first regions, and the multiple first regions are spaced apart along the second direction. The first direction, the thickness direction of the first wall, and the second direction are perpendicular to each other.

8. The battery device according to claim 7, characterized in that The number of the first regions is two, and the two first regions are respectively arranged at two ends of the first surface in the second direction.

9. The battery device according to claim 1, wherein: The end plate has a second surface and a third surface opposite to each other in the first direction, and two ends of the second region in the second direction are respectively connected to the second surface and the third surface.

10. The battery device according to claim 1, wherein: The battery device further includes a heat insulator provided between the first wall and the first region in a thickness direction of the first wall.

11. The battery device according to claim 1, wherein: The first wall includes a main body and a protruding portion, the heat exchange channel is arranged in the main body, and the main body is used to support the battery cell assembly; the protruding portion is protruding from the surface of the main body facing the battery cell assembly, along the thickness direction of the first wall, the protruding portion is arranged between the end plate and the main body, and the first area is connected to the main body.

12. The battery device according to claim 1, wherein: There are two end plates, the two end plates are spaced apart along the first direction, and the plurality of battery cells are disposed between the two end plates.

13. The battery device according to claim 12, characterized in that The battery device further includes a binding member, which cooperates with the end plate to clamp the plurality of battery cells.

14. The battery device according to claim 1, wherein: The box body includes a bottom wall, side walls and a box cover. The bottom wall and the box cover are arranged opposite to each other. One end of the side wall is arranged around the outer periphery of the bottom wall, and the other end forms an opening. The box cover closes the opening. The bottom wall, the side walls and the box cover jointly define a accommodating cavity for accommodating the battery cell assembly. The bottom wall is the first wall.

15. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 14, wherein the battery device is used to provide electrical energy.

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