Battery device and electric device

Abstract

The utility model relates to the technical field of batteries, and provides a battery device and a power utilization device.An adhesive layer is arranged on a bottom plate of the battery device, a plurality of soft package battery monomers are contained in a wrapping shell, the soft package battery monomers are connected to the adhesive layer through first openings of the wrapping shell, and at least part of a flattening piece is arranged on the sides, facing the bottom plate, of the soft package battery monomers; the thicknesses of the parts, between the soft package battery monomers and the bottom plate, of the leveling pieces are consistent, the leveling pieces are arranged on the bottom plate, and the parts, exposed out of the leveling pieces, of the soft package battery monomers are connected to the bottom plate through adhesive layers; according to the battery device provided by the embodiment of the invention, the plurality of soft package battery monomers are connected by utilizing at least part of the flat pieces with the same thickness, so that the gaps between the plurality of soft package battery monomers and the bottom plate can be kept consistent, and the thicknesses of the adhesive layers filled between the soft package battery monomers and the bottom plate can be kept consistent.

Description

TECHNICAL FIELD

[0001] The application relates to the battery technical field, and particularly provides 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] Taking a soft package battery monomer as an example, the soft package battery monomer is composed of an aluminum plastic film packaging structure. The soft package battery monomer is fixedly assembled on the bottom plate of the box through the adhesive layer. However, in the process of assembling multiple soft package battery monomers, the multiple soft package battery monomers may have inconsistent heights, thereby causing the adhesive layer between the multiple soft package battery monomers and the bottom plate to have inconsistent thicknesses, and further affecting the reliability of the battery device. UTILITY MODEL CONTENT

[0004] The purpose of the embodiments of the application is to provide a battery device and a power utilization device, aiming to solve the problem that the multiple soft package battery monomers may have inconsistent heights when assembled on the bottom plate, thereby causing the adhesive layer between the multiple soft package battery monomers and the bottom plate to have inconsistent thicknesses.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the embodiments of the application is as follows:

[0006] In a first aspect, the embodiments of the application provide a battery device, comprising a box, a cladding shell, a flattening piece and multiple soft package battery monomers. The box comprises a bottom plate, and the bottom plate is provided with an adhesive layer. The cladding shell is provided with a first opening on the side facing the bottom plate, and the cladding shell is connected to the bottom plate through the adhesive layer. The multiple soft package battery monomers are accommodated in the cladding shell, and the soft package battery monomers are connected to the adhesive layer through the first opening. At least part of the flattening piece is arranged on the side of the multiple soft package battery monomers facing the bottom plate, and the thickness of the part of the flattening piece between the soft package battery monomers and the bottom plate is consistent. The flattening piece is arranged on the bottom plate, and the part of the soft package battery monomers facing the bottom plate and exposed to the flattening piece is connected to the bottom plate through the adhesive layer.

[0007] The battery device provided by the embodiments of the application has the beneficial effects that at least part of the flattening piece is arranged on the side of the multiple soft package battery monomers facing the bottom plate, and the at least part of the flattening piece with consistent thickness is used to connect the multiple soft package battery monomers, so that when the multiple soft package battery monomers are assembled on the bottom plate through the flattening piece, the gap between the multiple soft package battery monomers and the bottom plate can be kept consistent, and further the thickness of the adhesive layer filled between the soft package battery monomers and the bottom plate can be kept consistent. In this way, the consistency of the connection of each soft package battery monomer to the bottom plate through the adhesive layer is higher, and thus the reliability of the battery device is better.

[0008] In some embodiments, the flat part includes a first flat part, the first flat part is arranged on a side of the plurality of soft-pack battery monomers in the same cladding shell towards the bottom plate, and the thickness of the first flat part is uniform; and the first flat part is connected to the plurality of soft-pack battery monomers.

[0009] By adopting the above technical solution, the first flat part is connected to the plurality of soft-pack battery monomers towards the bottom plate, and the first flat part with uniform thickness can simultaneously support the plurality of soft-pack battery monomers, so that the gap between the plurality of soft-pack battery monomers and the bottom plate is uniform, and thus the thickness of the glue layer between the plurality of soft-pack battery monomers and the bottom plate is uniform.

[0010] In some embodiments, in a first direction, the plurality of soft-pack battery monomers are arranged in sequence; and in a second direction, the first flat part is arranged at the middle part of the soft-pack battery monomers, and the first direction is perpendicular to the second direction.

[0011] By adopting the above technical solution, the first flat part is arranged at the middle part of the soft-pack battery monomers to form a better supporting effect on the soft-pack battery monomers, and the flatness of the side of the soft-pack battery monomers towards the bottom plate supported by the first flat part can be improved.

[0012] In some embodiments, in a first direction, the plurality of soft-pack battery monomers are arranged in sequence; the number of the first flat parts is a plurality, and in a second direction, the plurality of first flat parts are arranged in sequence and spaced apart, and the first direction is perpendicular to the second direction.

[0013] By adopting the above technical solution, the plurality of first flat parts can be arranged in sequence and spaced apart on the side of the soft-pack battery monomers towards the bottom plate along the second direction, so that the plurality of first flat parts can collectively support the plurality of soft-pack battery monomers to effectively improve the flatness of the side of the soft-pack battery monomers towards the bottom plate.

[0014] In some embodiments, in the second direction, the plurality of first flat parts are symmetrically arranged about the central axis of the side surface of each soft-pack battery monomer towards the bottom plate.

[0015] By adopting the above technical solution, the plurality of first flat parts arranged symmetrically have a better supporting effect on the plurality of soft-pack battery monomers, and the symmetry of the soft-pack battery monomers at the connection with the glue layer in the second direction is also better, so that the stability of the soft-pack battery monomers assembled on the bottom plate through the glue layer can be effectively improved.

[0016] In some embodiments, the flattening piece includes a second flattening portion, the second flattening portion is arranged on a side of the plurality of soft-pack battery monomers in the plurality of covered shells facing the bottom plate, and the second flattening portion has a uniform thickness; the second flattening portion is connected to the plurality of soft-pack battery monomers in the plurality of covered shells; wherein the side of the covered shell facing the bottom plate is provided with a first avoiding groove, and the second flattening portion is arranged in the first avoiding groove; or a second avoiding groove is arranged on the second flattening portion, and the covered shell is arranged in the second avoiding groove.

[0017] By adopting the above technical solution, the second flattening portion can be used to connect and support the plurality of soft-pack battery monomers in the plurality of covered shells, so as to further improve the flatness of the surface of the plurality of soft-pack battery monomers in the plurality of covered shells facing the bottom plate, and the thickness of the adhesive layer between the plurality of soft-pack battery monomers in the plurality of covered shells and the bottom plate is uniform.

[0018] In some embodiments, in the same projection plane perpendicular to the third direction, the projection of each soft-pack battery monomer and the projection of the flattening piece form a coincident area with the same area; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0019] By adopting the above technical solution, the contact area of the plurality of soft-pack battery monomers and the flattening piece is the same, so the bonding area of the plurality of soft-pack battery monomers and the adhesive layer is also the same, which can effectively improve the consistency of the plurality of soft-pack battery monomers assembled on the bottom plate.

[0020] In some embodiments, a back adhesive structure is arranged on a side surface of the flattening piece facing the soft-pack battery monomer, and the flattening piece is connected to the soft-pack battery monomer through the back adhesive structure.

[0021] By adopting the above technical solution, the flattening piece can be directly bonded to the plurality of soft-pack battery monomers through the back adhesive structure, which can effectively improve the assembly convenience of the flattening piece.

[0022] In some embodiments, a heat exchange channel is arranged in the bottom plate, and the adhesive layer is a heat-conducting adhesive layer.

[0023] By adopting the above technical solution, the adhesive layer adopts a heat-conducting adhesive layer, so that the heat-conducting adhesive layer can not only realize the connection and assembly of the soft-pack battery monomers, but also improve the heat exchange efficiency between the soft-pack battery monomers and the bottom plate, so as to improve the cooling effect of the soft-pack battery monomers.

[0024] In some embodiments, at least part of the flattening piece is a heat-conducting portion, the heat-conducting portion connects the soft-pack battery monomer and the heat-conducting adhesive layer.

[0025] By adopting the above technical solution, at least part of the flattening piece adopts a heat-conducting portion, so that the flattening piece can further improve the heat exchange effect between the soft-pack battery monomers and the bottom plate, and further improve the cooling effect of the soft-pack battery monomers.

[0026] In some embodiments, the flattening piece is an insulating structure; and / or, a surface of the flattening piece is covered with an insulating layer.

[0027] By adopting the technical solutions described above, the insulation protection capability between the soft-pack battery monomer and the bottom plate can be improved by the flattening piece, so as to effectively reduce the probability of short circuit between the soft-pack battery monomer and the bottom plate.

[0028] In a second aspect, the embodiments of the present application further provide a power utilization device, comprising the battery device as described above, and the battery device is used to provide electric energy.

[0029] The power utilization device provided by the embodiments of the present application comprises the battery device as described above, and the reliability of the power utilization device is also relatively high on the basis of the relatively high reliability of the battery device. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or related description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0031] Figure 1 A structural schematic diagram of a vehicle provided by the embodiments of the present application is shown in the figure;

[0032] Figure 2 A structural schematic diagram of a battery device provided by the embodiments of the present application is shown in the figure;

[0033] Figure 3 A schematic diagram of a soft-pack battery monomer provided by the embodiments of the present application is shown in the figure;

[0034] Figure 4 An exploded view of a cladding shell, a soft-pack battery monomer and a bottom plate provided by the embodiments of the present application is shown in the figure;

[0035] Figure 5 A structural schematic diagram of a battery monomer provided by the embodiments of the present application is shown in the figure, in which a first flattening part is arranged on the side of the battery monomer facing the bottom plate in the cladding shell;

[0036] Figure 6 An internal structural sectional view of a cladding shell provided by the embodiments of the present application is shown in the figure;

[0037] Figure 7 A structural schematic diagram of another battery monomer provided by the embodiments of the present application is shown in the figure, in which a first flattening part is arranged on the side of the battery monomer facing the bottom plate in the cladding shell;

[0038] Figure 8A structure schematic diagram of a soft package battery cell provided by an embodiment of the present application is assembled on a bottom plate.

[0039] Figure 9 A structure schematic diagram of a soft package battery cell provided by an embodiment of the present application is assembled on a bottom plate.

[0040] Figure 10 A structure schematic diagram of a soft package battery cell provided by an embodiment of the present application is assembled on a bottom plate.

[0041] In the drawings, various reference numbers refer to components having the same or similar function or structure.

[0042] 1000, vehicle;

[0043] 100, battery device; 200, controller; 300, motor;

[0044] 10, box body; 11, first box body; 12, second box body; 110, bottom plate; 111, heat exchange flow channel;

[0045] 20, soft package battery cell; 20a, electrode lead-out part;

[0046] 30, cladding shell; 31, first opening; 32, first avoiding groove;

[0047] 40, flat part; 401, heat conduction part; 41, first flat part; 42, second flat part; 421, second avoiding groove;

[0048] 50, glue layer;

[0049] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0050] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numbers represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0051] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0052] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0053] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0054] At present, from the development of market situation, the application of power battery device is more and more widely. Power battery is not only applied to energy storage power supply system such as hydroelectric power station, thermal power station, wind power station and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as industrial equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0055] Taking soft package battery monomer as an example, the soft package battery monomer is composed of aluminum plastic film packaging structure. When assembling the battery device, the soft package battery monomer needs to be accommodated in the cladding shell, and then the cladding shell and the soft package battery monomer accommodated inside are synchronously grabbed and placed on the bottom plate of the box, and fixed assembly is formed through the adhesive layer coated on the bottom plate. However, in the cladding shell, multiple soft package battery monomers may have inconsistent heights, which will lead to inconsistent thickness of the adhesive layer between the multiple soft package battery monomers and the bottom plate, and further affect the reliability of the battery device.

[0056] Based on the above considerations, in order to solve the problem that the height of the soft package battery monomer may not be consistent when it is assembled on the bottom plate, thereby causing the thickness of the glue layer between the multiple soft package battery monomers and the bottom plate to be inconsistent, a battery device is designed. At least part of the flat piece is arranged on the side of the multiple soft package battery monomers facing the bottom plate, and the thickness of the flat piece located on the side of the multiple soft package battery monomers facing the bottom plate is consistent. In this way, the flatness of the surface of the multiple soft package battery monomers supported by the flat piece is higher, so that when the flat piece and the supported multiple soft package battery monomers are assembled on the bottom plate, the gap between the multiple soft package battery monomers and the bottom plate is consistent, thereby making the thickness of the glue layer filled between the multiple soft package battery monomers and the bottom plate consistent. Therefore, the connection strength of the glue layer to the multiple soft package battery monomers is consistent, thereby making the assembly consistency of the multiple soft package battery monomers more optimal, and the reliability of the battery device more optimal.

[0057] The battery device disclosed in the embodiments of the present application can be used in a power consumption device using the battery device as a power source or a variety of energy storage systems using the battery device as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0058] The following embodiments are described by taking a power consumption device of an embodiment of the present application as a vehicle 1000 for convenience of description.

[0059] Please refer to Figure 1 , Figure 1 The vehicle 1000 provided in some embodiments of the present application is a structural schematic diagram. The vehicle 1000 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 a range extended car, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0060] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0061] Please refer to Figure 2 , Figure 2 The structural schematic diagram of the battery device 100 is provided for some embodiments of the present application. As shown in the figure, the battery device 100 comprises a box body 10 and a soft-pack battery cell 20, the box body 10 can be divided into a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 are opposite to each other to form a containing space for the soft-pack battery cell 20 between them. Figure 2

[0062] In the battery device 100, the soft-pack battery cell 20 can be multiple, and the multiple soft-pack battery cells 20 can be connected in series, in parallel or in a mixed connection; the mixed connection means that there are both series connection and parallel connection among the multiple soft-pack battery cells 20. The multiple soft-pack battery cells 20 can be directly connected in series, in parallel or in a mixed connection together, and then the whole formed by the multiple soft-pack battery cells 20 is placed in the containing space defined by the first box body 11 and the second box body 12. Of course, the battery device 100 can also be that the multiple soft-pack battery cells 20 are first connected in series, in parallel or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel or in a mixed connection to form a whole, and are contained in the containing space defined by the first box body 11 and the second box body 12. The battery device 100 can also comprise other structures.

[0063] In the embodiments of the present application, the soft-pack battery cell 20 can be a secondary battery cell, a lithium ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell or a magnesium ion battery cell, etc., which is not limited in the embodiments of the present application. The soft-pack battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc., which is also not limited in the embodiments of the present application.

[0064] Please refer to Figure 3 , Figure 3 The schematic diagram of the soft-pack battery cell 20 is provided for some embodiments of the present application. The soft-pack battery cell 20 refers to a battery cell using a soft packaging film (such as an aluminum plastic film, etc.) as a packaging shell. The soft-pack battery cell 20 has the characteristics of light structure weight and easy diversification of the outer contour shape compared with the battery cell with a metal structure shell.

[0065] The soft packaging film of the soft-pack battery cell 20 forms a containing cavity through encapsulation, the containing cavity is used to contain an electrode assembly (not shown in the figure) and an electrolyte, one side or both sides of the electrode assembly are provided with electrode lead-out parts 20a with opposite polarity, the electrode lead-out parts 20a are used to lead out the current generated by the electrode assembly, and a part of the electrode lead-out parts 20a extends to the outside of the soft packaging film through the sealing edge formed by the encapsulation of the soft packaging film and is electrically connected with other devices (such as the electrode lead-out parts 20a of other soft-pack battery cells 20).

[0066] ​According to some embodiments of the present application, please refer to Figure 2 to Figure 5 The battery device 100 provided by the embodiments of the present application comprises a box body 10, a cladding shell 30, a flattening piece 40 and a plurality of soft-pack battery monomers 20. The box body 10 comprises a bottom plate 110, and a glue layer 50 is arranged on the bottom plate 110. The cladding shell 30 is provided with a first opening 31 on the side facing the bottom plate 110, and the cladding shell 30 is connected to the bottom plate 110 through the glue layer 50. The plurality of soft-pack battery monomers 20 are accommodated in the cladding shell 30, and the soft-pack battery monomers 20 are connected to the glue layer 50 through the first opening 31. At least part of the flattening piece 40 is arranged on the side of the plurality of soft-pack battery monomers 20 facing the bottom plate 110, and the thickness of the part of the flattening piece 40 between the soft-pack battery monomers 20 and the bottom plate 110 is uniform. The flattening piece 40 is arranged on the bottom plate 110, and the part of the soft-pack battery monomers 20 facing the bottom plate 110 and exposed to the flattening piece 40 is connected to the bottom plate 110 through the glue layer 50.

[0067] The box body 10 comprises a bottom plate 110, which refers to a plate structure for connecting and supporting the cladding shell 30 and the soft-pack battery monomers 20. Optionally, the bottom plate 110 can be but is not limited to a plate structure of various materials such as a steel plate, an aluminum plate, a composite plate and the like. The bottom plate 110 can be formed by one-piece extrusion of aluminum, or can also be formed by various processes such as tailor welding.

[0068] The cladding shell 30 refers to a structure for forming a wrapping protection for the soft-pack battery monomers 20. The cladding shell 30 has an accommodation space inside, so that the soft-pack battery monomers 20 can be accommodated inside the cladding shell 30; and a plurality of soft-pack battery monomers 20 can be accommodated in each cladding shell 30. In some embodiments, the plurality of soft-pack battery monomers 20 accommodated in the cladding shell 30 can be arranged in sequence, for example, arranged in sequence along the width direction of the cladding shell 30.

[0069] The number of cladding shells 30 can be one or any number of more than one. For example, when the number of cladding shells 30 is multiple, the plurality of cladding shells 30 can be arranged in sequence to form one or more columns in any direction.

[0070] Optionally, the material of the cladding shell 30 can be selected from copper, aluminum or other metal or alloy materials. In this way, the structural strength of the cladding shell 30 is relatively optimal, which can protect the internal soft-pack battery monomers 20, and the thermal conductivity of the cladding shell 30 is also relatively optimal, which can conduct and dissipate the heat generated by the soft-pack battery monomers 20 accommodated inside.

[0071] The casing 30 has a first opening 31 on the side facing the base plate 110; thus, the pouch battery cell 20 can be assembled into the casing 30 through the first opening 31. Furthermore, when the casing 30 and the pouch battery cell 20 inside are simultaneously clamped and assembled onto the base plate 110, the casing 30 can be connected to the base plate 110 via the adhesive layer 50. The pouch battery cell 20 located inside the casing 30 can pass through the first opening 31 and be bonded and fixed to the adhesive layer 50 on the base plate 110, thereby improving the stability of the pouch battery cell 20 assembly.

[0072] The aforementioned adhesive layer 50 can be a colloidal structure with superior adhesive strength, such as structural adhesive or thermally conductive adhesive.

[0073] The leveling component 40 refers to a structural component used to level the surfaces of multiple pouch battery cells 20 facing the base plate 110. Optionally, one leveling component 40 may be used only to level the surfaces of multiple pouch battery cells 20 within the same casing 30 facing the base plate 110; or, one leveling component 40 may be used to level the surfaces of multiple pouch battery cells 20 within multiple sequentially arranged casings 30 facing the base plate 110.

[0074] At least a portion of the leveling member 40 is disposed on the side of the plurality of pouch cell 20 facing the base plate 110. Optionally, at least a portion of the leveling member 40 is disposed on the side of the pouch cell 20 facing the base plate 110, for example, when the leveling member 40 is used to perform a leveling operation on the pouch cell 20 within the plurality of housings 30, part of the leveling member 40 is located between the pouch cell 20 and the base plate 110, and part of the leveling member 40 is located outside the pouch cell 20; or, the leveling member 40 may be disposed entirely on the side of the pouch cell 20 facing the base plate 110, for example, when the leveling member 40 is used to perform a leveling operation on all the pouch cell 20 within a single housing 30.

[0075] The flattening component 40 can be connected to the side of the base plate 110 of multiple pouch battery cells 20 housed in the same casing 30 by means of bonding, bundling, or snap-fit ​​connection; or, the flattening component 40 can be bonded to the side of the pouch battery cells 20 housed in multiple casings 30 facing the base plate 110. Meanwhile, the thickness of the portion of the flattening component 40 between the pouch battery cells 20 and the base plate 110 is uniform; thus, when the surface of all pouch battery cells 20 housed in the casing 30 facing the base plate 110 is supported on the flattening component 40, these pouch battery cells 20 can maintain a flat state in contact with the surface of the flattening component 40 through the support connection of the flattening component 40.

[0076] It should be understood that the flat piece 40 is supported and arranged on the side of the soft package battery cell 20 facing the bottom plate 110, and the flat piece 40 only supports part of the surface covering the soft package battery cell 20, so that the part of the surface of the soft package battery cell 20 facing the bottom plate 110 and exposed to the flat piece 40 can be bonded and assembled on the bottom plate 110 by the adhesive layer 50.

[0077] The flat piece 40 includes but is not limited to a plate body structure, a rod body structure, a strap structure, etc. For example, in some embodiments, the flat piece 40 can include a plate body structure, and the flat piece 40 in the form of a plate body structure can be bonded on the side surface of all soft package battery cells 20 arranged in the inner part of the cladding shell 30 facing the bottom plate 110; in this way, the side surface of all soft package battery cells 20 arranged in the inner part of the cladding shell 30 facing the bottom plate 110 are in a state of being supported on the flat piece 40, so that all soft package battery cells 20 arranged in the inner part of the cladding shell 30 can be kept in a flat state of being in close contact with the surface of the flat piece 40 by the support of the flat piece 40.

[0078] In this way, when the cladding shell 30 and the soft package battery cell 20 inside are synchronously clamped and assembled on the bottom plate 110, the flat piece 40 on the side of the soft package battery cell 20 facing the bottom plate 110 can be arranged on the bottom plate 110 first, for example, directly abutting the bottom plate 110, or arranged on the adhesive layer 50 and bonded with the bottom plate 110 through the adhesive layer 50, and the plurality of soft package battery cells 20 in the cladding shell 30 and the bottom plate 110 can keep a consistent gap under the action of the flat piece 40, so that when the adhesive layer 50 is connected with the soft package battery cell 20 and filled between the soft package battery cell 20 and the bottom plate 110, the thickness of the adhesive layer 50 between each soft package battery cell 20 and the bottom plate 110 is consistent.

[0079] It should be understood that when the soft package battery cells 20 in the plurality of cladding shells 30 are all subjected to the flattening operation by the flat piece 40, the thickness of the adhesive layer 50 between the soft package battery cells 20 in the plurality of cladding shells 30 and the bottom plate 110 can be kept consistent.

[0080] The battery device 100 provided by the embodiments of the present application can connect the plurality of soft package battery cells 20 by using the at least part of the flat piece 40 with consistent thickness, so that when the plurality of soft package battery cells 20 are assembled on the bottom plate 110 by the flat piece 40, the gap between the plurality of soft package battery cells 20 and the bottom plate 110 can be kept consistent, and further the thickness of the adhesive layer 50 filled between the soft package battery cell 20 and the bottom plate 110 can be kept consistent; in this way, the consistency of the connection between each soft package battery cell 20 and the bottom plate 110 by the adhesive layer 50 is higher, so that the reliability of the battery device 100 is better.

[0081] Please refer to Figure 4 to Figure 7 In some embodiments, the flattening member 40 comprises a first flattening part 41, which is arranged on the side of the plurality of soft-pack battery cells 20 in the same cladding shell 30 towards the bottom plate 110, and the thickness of the first flattening part 41 is uniform; the first flattening part 41 is connected to the plurality of soft-pack battery cells 20.

[0082] The first flattening part 41 refers to a component arranged on the side of the plurality of soft-pack battery cells 20 in the same cladding shell 30 towards the bottom plate 110. In this way, the first flattening part 41 does not extend between the soft-pack battery cells 20 and the cladding shell 30, so that the first flattening part 41 does not occupy the arrangement space of the soft-pack battery cells 20 towards the cladding shell 30, i.e., the first flattening part 41 has a lower impact on the energy density inside the cladding shell 30. In some embodiments, the first flattening part 41 can be connected to the surface of the soft-pack battery cells 20 by bonding.

[0083] The thickness of the first flattening part 41 is uniform; in this way, when one side of the first flattening part 41 supports and connects the plurality of soft-pack battery cells 20, the other side of the first flattening part 41 is bonded and assembled on the bottom plate 110 through the adhesive layer 50, so that the gap between the plurality of supported soft-pack battery cells 20 and the bottom plate 110 can be kept uniform, thereby the thickness of the adhesive layer 50 between the plurality of soft-pack battery cells 20 and the bottom plate 110 can be kept uniform, and the bonding strength of the adhesive layer 50 on the plurality of soft-pack battery cells 20 can also be kept uniform, thereby the overall consistency of the battery device 100 is more optimal.

[0084] The first flattening part 41 is arranged on the side of the plurality of soft-pack battery cells 20 in the same cladding shell 30 towards the bottom plate 110, and the first flattening part 41 is arranged on each of the plurality of soft-pack battery cells 20 in the plurality of cladding shells 30, so that the plurality of soft-pack battery cells 20 in the plurality of cladding shells 30 can keep the thickness of the adhesive layer 50 between each soft-pack battery cell 20 and the bottom plate 110 uniform through the flattening effect of the first flattening part 41.

[0085] Optionally, the first flattening part 41 can be, but is not limited to, a flat plate, a flat block, a flat strip, etc. The same first flattening part 41 is used to simultaneously connect all the soft-pack battery cells 20 in the same cladding shell 30, so that the first flattening part 41 can synchronously support the soft-pack battery cells 20 in the cladding shell 30 to keep the flatness of the side of the soft-pack battery cells 20 towards the bottom plate 110.

[0086] Exemplarily, in some embodiments, the first flat part 41 can be a flat plate of a plate structure, the thickness of the flat plate is consistent at any position; the flat plate is bonded to the side of the soft package battery cell 20 in any one of the cladding shells 30 towards the bottom plate 110, and the flat plate can simultaneously connect and support all the soft package battery cells 20 in the cladding shell 30; in this way, the flatness of the side surface of all the soft package battery cells 20 in the cladding shell 30 towards the bottom plate 110 is better, when the soft package battery cells 20 are assembled on the bottom plate 110, the flat plate first contacts and bonds with the adhesive layer 50, at this time, the spacing of the plurality of soft package battery cells 20 supported on the flat plate relative to the bottom plate 110 is consistent, so that the thickness of the adhesive layer 50 between the plurality of soft package battery cells 20 and the bottom plate 110 can be consistent.

[0087] Alternatively, in other embodiments, the first flat part 41 can be a flat rod of a rod structure, the thickness of the flat rod is consistent at any position; a plurality of flat rods, for example, two, three or more flat rods, are bonded to the side of the soft package battery cell 20 in any one of the cladding shells 30 towards the bottom plate 110, and the plurality of flat rods can be arranged at intervals, so that each flat rod can simultaneously support and connect all the soft package battery cells 20 in the cladding shell 30; in this way, the flatness of the side surface of all the soft package battery cells 20 in the cladding shell 30 towards the bottom plate 110 is better, when the soft package battery cells 20 are assembled on the bottom plate 110, the flat rod first contacts and bonds with the adhesive layer 50, at this time, the spacing of the plurality of soft package battery cells 20 supported on the plurality of flat rods arranged at intervals relative to the bottom plate 110 is consistent, so that the thickness of the adhesive layer 50 between the plurality of soft package battery cells 20 and the bottom plate 110 can be consistent.

[0088] In this way, the first flat part 41 is connected to the side of the plurality of soft package battery cells 20 towards the bottom plate 110, the thickness-consistent first flat part 41 can simultaneously support the plurality of soft package battery cells 20, so that the spacing between the plurality of soft package battery cells 20 and the bottom plate 110 is consistent, and the thickness of the adhesive layer 50 between the plurality of soft package battery cells 20 and the bottom plate 110 is consistent.

[0089] Please refer to Figure 7 In some embodiments, in the first direction X, the plurality of soft package battery cells 20 are arranged in sequence; in the second direction Y, the first flat part 41 is arranged at the middle of the soft package battery cell 20, and the first direction X is perpendicular to the second direction Y.

[0090] Among them, the first direction X can mean any direction parallel to the bottom plate 110; exemplarily, the first direction X can be the length direction of the bottom plate 110, or the first direction X can be the width direction of the bottom plate 110.

[0091] Similarly, the second direction Y can refer to any direction parallel to the bottom plate 110, and the second direction Y is perpendicular to the first direction X. For example, the first direction X can be the length direction of the bottom plate 110, and the second direction Y can be the width direction of the bottom plate 110; or the first direction X can be the width direction of the bottom plate 110, and the second direction Y can be the length direction of the bottom plate 110.

[0092] In the first direction X, the plurality of soft package battery monomers 20 are arranged in sequence, that is, the plurality of soft package battery monomers 20 are arranged in sequence along the first direction X in the cladding shell 30.

[0093] In the second direction Y, the first flat part 41 is arranged at the middle part of the soft package battery monomer 20; that is, in the direction perpendicular to the arrangement direction of the soft package battery monomer 20, the first flat part 41 is arranged at the side of the soft package battery monomer 20 facing the bottom plate 110 and at the middle part of the soft package battery monomer 20. In this way, the first flat part 41 can simultaneously support the connection at the middle part of the plurality of soft package battery monomers 20 and support and flatten the soft package battery monomer 20; and in the second direction Y, the opposite sides of the first flat part 41 are provided with the adhesive layer 50 and are bonded with the soft package battery monomer 20, so that the soft package battery monomer 20 has better flatness and better bonding stability through the adhesive layer 50.

[0094] For example, in some embodiments, in the second direction Y, the first flat part 41 can be arranged at the center of the soft package battery monomer 20 and symmetrically arranged, so that the area of the adhesive layer 50 bonded with the soft package battery monomer 20 at the opposite ends of the first flat part 41 in the second direction Y is consistent, thereby further improving the bonding stability of the soft package battery monomer 20.

[0095] In this way, the plurality of first flat parts 41 can be arranged in sequence along the second direction Y at the side of the soft package battery monomer 20 facing the bottom plate 110, so that the plurality of first flat parts 41 can jointly support the plurality of soft package battery monomers 20 to effectively improve the flatness of the side of the soft package battery monomer 20 facing the bottom plate 110; and the adhesive layers 50 on the opposite sides of the first flat part 41 in the second direction Y can be bonded with the soft package battery monomer 20, thereby effectively improving the bonding stability of the soft package battery monomer 20.

[0096] Please refer to Figure 5 and Figure 6 In some embodiments, in the first direction X, the plurality of soft package battery monomers 20 are arranged in sequence; the number of the first flat parts 41 is a plurality, and in the second direction Y, the plurality of first flat parts 41 are arranged in sequence, and the first direction X is perpendicular to the second direction Y.

[0097] In the embodiment, the first flat portion 41 is in a plurality, for example, two, three or any number of more than three; the plurality of first flat portions 41 can be sequentially and spacedly arranged along the second direction Y. In this way, the plurality of first flat portions 41 can be collectively used for the flat supporting operation of the plurality of soft package battery monomers 20 arranged in the inner part of the cladding shell 30.

[0098] Exemplarily, in some embodiments, the first flat portion 41 can be a rod-shaped structure, the number of the first flat portion 41 can be three, and the three first flat portions 41 are sequentially and spacedly arranged on the side surface of the plurality of soft package battery monomers 20 facing the bottom plate 110 along the second direction Y; wherein the middle one of the first flat portions 41 along the second direction Y is arranged on the central axis of the soft package battery monomers 20 along the second direction Y, and the other two first flat portions 41 are symmetrically arranged on the opposite sides of the middle first flat portion 41.

[0099] In this way, the plurality of first flat portions 41 can be sequentially and spacedly arranged on the side of the plurality of soft package battery monomers 20 facing the bottom plate 110 along the second direction Y, and thus the plurality of first flat portions 41 can collectively support the plurality of soft package battery monomers 20 to effectively improve the flatness of the side of the plurality of soft package battery monomers 20 facing the bottom plate 110.

[0100] Please refer to Figure 5 and Figure 6 In some embodiments, the plurality of first flat portions 41 are symmetrically arranged about the central axis of the side surface of each soft package battery monomer 20 facing the bottom plate 110 along the second direction Y.

[0101] In the embodiment, the first flat portion 41 is symmetrically arranged about the central axis of the side surface of each soft package battery monomer 20 facing the bottom plate 110 along the second direction Y; in this way, the opposite ends of the first flat portion 41 along the second direction Y are consistent with the area of the adhesive layer 50 bonding the soft package battery monomer 20, thereby further improving the bonding stability of the soft package battery monomer 20.

[0102] In this way, the plurality of first flat portions 41 arranged symmetrically have a better supporting effect on the plurality of soft package battery monomers 20, and the symmetry of the connection between the soft package battery monomer 20 and the adhesive layer 50 along the second direction Y is also better, thereby effectively improving the stability of the soft package battery monomer 20 assembled on the bottom plate 110 through the adhesive layer 50.

[0103] Please refer to Figure 8 to Figure 10In some embodiments, the flat part 40 comprises a second flat part 42, which is arranged on the side of the plurality of soft-packet battery monomers 20 in the plurality of cladding shells 30 towards the bottom plate 110, and the thickness of the second flat part 42 is uniform; the second flat part 42 is connected to the plurality of soft-packet battery monomers 20 in the plurality of cladding shells 30; wherein the side of the cladding shell 30 towards the bottom plate 110 is provided with a first avoiding slot 32, and the second flat part 42 is arranged in the first avoiding slot 32; or, a second avoiding slot 421 is arranged on the second flat part 42, and the cladding shell 30 is arranged in the second avoiding slot 421.

[0104] The second flat part 42 refers to the part arranged on the side of the plurality of soft-packet battery monomers 20 in the plurality of cladding shells 30 towards the bottom plate 110. In this way, the second flat part 42 can be used to simultaneously perform the flat supporting operation on the soft-packet battery monomers 20 in the plurality of cladding shells 30. In some embodiments, the first flat part 41 can be connected to the surface of the soft-packet battery monomer 20 by adhesion.

[0105] The number of the second flat part 42 can be one or any number of more than one. One or more second flat parts 42 can be used to simultaneously perform the flat supporting operation on the plurality of soft-packet battery monomers 20 in the plurality of cladding shells 30.

[0106] The thickness of the second flat part 42 is uniform. In this way, when the side of the second flat part 42 supports and connects the plurality of soft-packet battery monomers 20, the other side of the second flat part 42 is assembled on the bottom plate 110 by the adhesive tape. In this way, the gap between the plurality of supported soft-packet battery monomers 20 and the bottom plate 110 can be kept uniform, so that the thickness of the adhesive layer 50 between the plurality of soft-packet battery monomers 20 and the bottom plate 110 can be kept uniform, and the adhesion strength of the adhesive layer 50 on the plurality of soft-packet battery monomers 20 can be kept uniform, thereby making the overall consistency of the battery device 100 more optimal.

[0107] Optionally, the second flat part 42 can be, but is not limited to, a flat plate, a flat block, a flat strip, etc. One second flat part 42 is used to simultaneously connect all the soft-packet battery monomers 20 in the plurality of cladding shells 30, so that the first flat part 41 can synchronously support the soft-packet battery monomers 20 in the plurality of cladding shells 30 to keep the flatness of the side of the soft-packet battery monomers 20 towards the bottom plate 110.

[0108] The side of the cladding shell 30 towards the bottom plate 110 is provided with a first avoiding slot 32 for the arrangement of the second flat part 42. In this way, when the cladding shell 30 and the soft-packet battery monomer 20 are assembled on the bottom plate 110, the second flat part 42 does not affect the assembly operation of the cladding shell 30, and the second flat part 42 can be accommodated in the first avoiding slot 32, thereby effectively reducing the probability of the second flat part 42 lifting the cladding shell 30.

[0109] Alternatively, the second flat portion 42 is provided with a second avoiding groove 421 for accommodating the cladding shell 30; in this way, when the cladding shell 30 and the soft-pack battery cell 20 are assembled on the bottom plate 110, a plurality of cladding shells 30 can be inserted into the corresponding second avoiding grooves 421, so as to reduce the influence of the second flat portion 42 on the cladding shell 30 and reduce the probability of the cladding shell 30 being lifted by the second flat portion 42.

[0110] Exemplarily, in some embodiments, the second flat portion 42 can be a flat rod in a rod-shaped structure, the number of the flat rods can be multiple, for example, three, and the thickness of any position of the flat rod remains consistent; the three flat rods can be arranged in parallel and at intervals, and the extension direction of the flat rods can be towards the arrangement direction of the cladding shell 30; in this way, the three flat rods can extend and pass below the plurality of cladding shells 30, so that the three flat rods can simultaneously support all the soft-pack battery cells 20 connected in the plurality of cladding shells 30; in this way, the flatness of all the soft-pack battery cells 20 in the plurality of cladding shells 30 towards the side surface of the bottom plate 110 is better, and when the soft-pack battery cell 20 is assembled on the bottom plate 110, the flat rod first contacts and bonds with the adhesive layer 50, and the spacing of the plurality of soft-pack battery cells 20 supported on the multiple flat rods arranged at intervals remains consistent relative to the bottom plate 110, so that the thickness of the adhesive layer 50 between the plurality of soft-pack battery cells 20 and the bottom plate 110 can remain consistent.

[0111] In this way, the second flat portion 42 can support the soft-pack battery cells 20 connected in the plurality of cladding shells 30, so as to further improve the flatness of the surface of the soft-pack battery cells 20 in the plurality of cladding shells 30 towards the side of the bottom plate 110, and thus the thickness of the adhesive layer 50 between the soft-pack battery cells 20 in the plurality of cladding shells 30 and the bottom plate 110 remains consistent.

[0112] Please refer to Figure 5 to Figure 7 , or refer to Figure 8 to Figure 10 In some embodiments, in the same projection plane perpendicular to the third direction Z, the area of the overlapping region formed by the orthographic projection of each soft-pack battery cell 20 and the orthographic projection of the flat piece 40 is the same; wherein the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0113] Wherein, the third direction Z refers to a direction perpendicular to the first direction X and the second direction Y at the same time; exemplarily, in some embodiments, the third direction Z can be a direction perpendicular to the bottom plate 110.

[0114] In the same projection plane perpendicular to the third direction Z, the area of the overlapping region formed by the orthographic projection of each soft-pack battery cell 20 and the orthographic projection of the flat piece 40 is the same; that is, the overlapping area of the flat piece 40 and each soft-pack battery cell 20 is the same.

[0115] In this way, the contact area of the plurality of soft-pack battery cells 20 and the flat piece 40 is the same, and thus the bonding area of the plurality of soft-pack battery cells 20 and the adhesive layer 50 is also the same. The adhesive force formed by the adhesive layer 50 on each soft-pack battery cell 20 can be consistent, which can effectively improve the consistency of the plurality of soft-pack battery cells 20 assembled on the bottom plate 110.

[0116] Please refer to Figure 5 to Figure 7 In some embodiments, the side surface of the flat piece 40 facing the soft-pack battery cell 20 is provided with a back adhesive structure (not shown in the figure), and the flat piece 40 is connected to the soft-pack battery cell 20 through the back adhesive structure.

[0117] The back adhesive structure refers to a structure with an adhesive on the surface.

[0118] By providing the back adhesive structure on the side surface of the flat piece 40 facing the soft-pack battery cell 20, the flat piece 40 can be directly bonded to the surface of the plurality of soft-pack battery cells through the back adhesive structure.

[0119] In this way, the flat piece 40 can be directly bonded to the plurality of soft-pack battery cells 20 through the back adhesive structure, which can effectively improve the assembly convenience of the flat piece 40.

[0120] Please refer to Figure 5 and Figure 6 In some embodiments, the inside of the bottom plate 110 is provided with a heat exchange flow channel 111, and the adhesive layer 50 is a heat-conducting adhesive layer 50.

[0121] The heat exchange flow channel 111 refers to a channel structure for flowing a heat exchange medium. The heat exchange medium can be, but is not limited to, cooling water, cooling oil, phase change material, etc.

[0122] Optionally, the heat exchange flow channel 111 can be a recessed channel formed by stamping, rolling or the like, or the heat exchange flow channel 111 can also be any one of the cavities in a cavity plate body. For example, in some embodiments, the bottom plate 110 includes a heat exchange plate body and a flow channel plate body, the flow channel plate body is processed to form a recessed channel by stamping, rolling or the like, the heat exchange plate body and the flow channel plate body are welded to form an integral body, and the heat exchange plate body surrounds the channel to form the heat exchange flow channel 111.

[0123] Meanwhile, in the embodiment, the adhesive layer 50 can be a heat-conducting adhesive layer 50, which refers to a glue structure with strong high-temperature resistance and heat conduction capacity. When the soft-pack battery monomer 20 is fixed on the bottom plate 110 with the heat exchange channel 111 through the heat-conducting adhesive layer 50, the heat generated by the soft-pack battery monomer 20 during operation can be conducted to the bottom plate 110 through the heat-conducting adhesive layer 50, and the heat exchange medium in the heat exchange channel 111 in the bottom plate 110 can absorb the heat, so that the heat dissipation and cooling effect of the soft-pack battery monomer 20 can be achieved.

[0124] Please refer to Figure 5 to Figure 7 In some embodiments, at least part of the flattening piece 40 is a heat-conducting part 401, which connects the soft-pack battery monomer 20 and the heat-conducting adhesive layer 50.

[0125] The heat-conducting part 401 refers to a structure with better heat conduction performance. For example, the heat-conducting part 401 can be a structure formed of heat-conducting ceramic, aluminum fluoride, aluminum silicon, etc.

[0126] At least part of the flattening piece 40 is a heat-conducting part 401; optionally, part of the flattening piece 40 can be a heat-conducting part 401, and another part of the flattening piece 40 can be formed of other hard materials, so that the heat conduction effect of the flattening piece 40 can be effectively improved. Alternatively, the flattening piece 40 can be formed of the heat-conducting part 401, for example, a heat-conducting ceramic sheet can be used as the heat-conducting part 401, and the heat-conducting ceramic sheet also serves as the flattening piece 40 to support the side surface of the soft-pack battery monomer 20 facing the bottom plate 110.

[0127] In this way, at least part of the flattening piece 40 is a heat-conducting part 401, so that the flattening piece 40 can further improve the heat exchange effect between the soft-pack battery monomer 20 and the bottom plate 110, and further improve the cooling effect of the soft-pack battery monomer 20.

[0128] Please refer to Figure 5 to Figure 7 In some embodiments, the flattening piece 40 is an insulating structure; and / or, the surface of the flattening piece 40 is covered with an insulating layer (not shown in the figure).

[0129] In the embodiment, the flattening piece 40 can be an insulating structure, i.e., the flattening piece 40 has better insulating performance. For example, in some embodiments, the insulating structure can be a ceramic sheet body, an aluminum fluoride block, etc. In this way, when the flattening piece 40 is supported on the side of the soft-pack battery monomer 20 facing the bottom plate 110, the flattening piece 40 can also reduce the probability of short circuit between the soft-pack battery monomer 20 and the bottom plate 110.

[0130] And / or, the surface of the flattening piece 40 is covered with an insulating layer; wherein the insulating layer can be but is not limited to an insulating coating, an insulating film layer, an insulating adhesive layer 50, and the like layer structure with better insulating performance

[0131] In this way, the insulating protection capability between the soft-pack battery monomer 20 and the bottom plate 110 can be improved by the flattening piece 40, so as to effectively reduce the probability of short circuit between the soft-pack battery monomer 20 and the bottom plate 110.

[0132] In the following, the battery device 100 provided by the present application will be further introduced according to specific embodiments.

[0133] Please refer to Figure 4 to Figure 7 In the present embodiment, the battery device 100 comprises a box body 10, a cladding shell 30, a flattening piece 40 and a plurality of soft-pack battery monomers 20, the box body 10 comprises a bottom plate 110, the bottom plate 110 is provided with an adhesive layer 50; the cladding shell 30 is provided with a first opening 31 on the side facing the bottom plate 110, and the cladding shell 30 is connected to the bottom plate 110 through the adhesive layer 50; the plurality of soft-pack battery monomers 20 are accommodated in the cladding shell 30, and the soft-pack battery monomers 20 are connected to the adhesive layer 50 through the first opening 31. In the first direction X, the plurality of soft-pack battery monomers 20 are arranged in sequence.

[0134] The flattening piece 40 comprises a first flattening part 41, the first flattening part 41 is arranged on the side of the plurality of soft-pack battery monomers 20 accommodated in the same cladding shell 30 facing the bottom plate 110, and the thickness of the first flattening part 41 is uniform at each part; the first flattening part 41 is arranged on the bottom plate 110, and the part of the soft-pack battery monomer 20 facing the bottom plate 110 and exposed to the first flattening part 41 is connected to the bottom plate 110 through the adhesive layer 50.

[0135] Optionally, in the second direction Y, the first flattening part 41 is arranged at the middle part of the soft-pack battery monomer 20; or, in the second direction Y, a plurality of first flattening parts 41 are arranged in sequence with intervals, and the plurality of first flattening parts 41 are symmetrically arranged about the central axis of the side surface of each soft-pack battery monomer 20 facing the bottom plate 110. Wherein, the first direction X and the second direction Y are perpendicular.

[0136] In the same projection plane perpendicular to the third direction Z, the area of the overlapping region formed by the orthogonal projection of each soft-pack battery monomer 20 and the orthogonal projection of the first flattening part 41 is the same; wherein, the first direction X, the second direction Y and the third direction Z are perpendicular to each other. In this way, the contact area of the plurality of soft-pack battery monomers 20 and the first flattening part 41 is the same, so the adhesion area of the plurality of soft-pack battery monomers 20 and the adhesive layer 50 is also the same, thereby effectively improving the consistency of the plurality of soft-pack battery monomers 20 assembled on the bottom plate 110.

[0137] The first flat part 41 can be a heat conduction part 401, the glue layer 50 can be a heat conduction glue layer 50, and the inside of the bottom plate 110 is provided with a heat exchange flow channel 111. In this way, the cooling effect of the soft package battery monomer 20 can be effectively improved.

[0138] Please refer to Figure 1 to Figure 4 The application also provides a power utilization device, which comprises the battery device 100.

[0139] The power utilization device provided by the application, for example, the vehicle 1000, comprises the battery device 100, and the reliability of the power utilization device is also better on the basis of the reliability of the battery device 100.

[0140] The above is only a preferred embodiment of the application, and is not intended to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A battery device, characterized by: The battery device comprises: a box body comprising a bottom plate, wherein a glue layer is arranged on the bottom plate; a cladding shell provided with a first opening on a side facing the bottom plate, wherein the cladding shell is connected to the bottom plate through the glue layer; a plurality of soft package battery cells accommodated in the cladding shell, wherein the soft package battery cells are connected to the glue layer through the first opening; and a flattening piece arranged at least partially on a side of the plurality of soft package battery cells facing the bottom plate, and the thickness of the portion between the soft package battery cells and the bottom plate is uniform. The flattening piece is arranged on the bottom plate, and the portion of the side of the soft package battery cells facing the bottom plate and exposed to the flattening piece is connected to the bottom plate through the glue layer.

2. The battery device of claim 1, wherein: The flattening piece comprises a first flattening part arranged on a side of the plurality of soft package battery cells accommodated in the same cladding shell and facing the bottom plate, wherein the thickness of each portion of the first flattening part is uniform; and the first flattening part is connected to the plurality of soft package battery cells.

3. The battery device of claim 2, wherein: In a first direction, the plurality of soft package battery cells are arranged in sequence; and in a second direction, the first flattening part is arranged at a middle portion of the soft package battery cells, wherein the first direction is perpendicular to the second direction.

4. The battery device of claim 2, wherein: In a first direction, the plurality of soft package battery cells are arranged in sequence; the number of the first flattening parts is a plurality, and in a second direction, the plurality of first flattening parts are arranged in sequence with intervals, wherein the first direction is perpendicular to the second direction.

5. The battery device of claim 4, wherein: In the second direction, the plurality of first flattening parts are symmetrically arranged about a central axis of a side surface of each soft package battery cell facing the bottom plate.

6. The battery device according to any one of claims 1 to 5, characterized by: The flattening piece comprises a second flattening part arranged on a side of the plurality of soft package battery cells accommodated in the plurality of cladding shells and facing the bottom plate, wherein the thickness of each portion of the second flattening part is uniform; and the second flattening part is connected to the plurality of soft package battery cells accommodated in the plurality of cladding shells. The side of the cladding shell facing the bottom plate is provided with a first avoiding groove, and the second flattening part is arranged in the first avoiding groove; or a second avoiding groove is arranged on the second flattening part, and the cladding shell is arranged in the second avoiding groove.

7. The battery device according to any one of claims 3 to 5, characterized by: In a same projection plane perpendicular to a third direction, the area of the overlapping region formed by the projection of each soft package battery cell and the projection of the flattening piece is the same; wherein the first direction, the second direction and the third direction are perpendicular to each other.

8. The battery device according to any one of claims 1 to 5, characterized by: The side of the flattening piece facing the soft package battery cell is provided with a back glue structure, and the flattening piece is connected to the soft package battery cell through the back glue structure.

9. The battery device according to any one of claims 1 to 5, characterized by: The inside of the bottom plate is provided with a heat exchange channel, and the glue layer is a heat-conducting glue layer.

10. The battery device of claim 9, wherein: At least a portion of the flattening piece is a heat-conducting part, and the heat-conducting part connects the soft package battery cell and the heat-conducting glue layer.

11. The battery device according to any one of claims 1 to 5, characterized by: The flattening piece is an insulating structure; and / or an insulating layer is arranged on the surface of the flattening piece.

12. An electrical device, characterized by: The battery device comprises the battery device according to any one of claims 1 to 11, and is used for providing electric energy.

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