Battery device and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery device and a power utilization device. The battery device comprises a battery assembly and a heat insulation layer, the battery assembly comprises a plurality of battery monomers which are sequentially arranged in the first direction, the heat insulation layer is arranged on at least one end face of the battery assembly in the second direction, the heat insulation layer is provided with a through hole, the through hole penetrates through two opposite surfaces of the heat insulation layer in the second direction, and colloid is arranged in the through hole. One end face of the colloid in the second direction is connected with the battery assembly, the other end face of the colloid in the second direction is flush with the corresponding end face of the through hole or extends out of the through hole, and the second direction is perpendicular to the first direction; the elasticity of the heat insulation layer is greater than that of the colloid. According to the battery device and the power utilization device provided by the invention, the risk of a dominant frequency falling phenomenon of the power utilization device using the battery device can be reduced.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery device and an electrical device. Background Art

[0002] When the battery device is in use, due to external forces, some battery cells in the battery assembly may move upward and / or downward, resulting in the occurrence of the phenomenon of dropping the main frequency, which affects the battery device and the electrical device. Summary of the Utility Model

[0003] In view of the above problems, this application provides a battery device and an electrical device, aiming to reduce the probability of the occurrence of the phenomenon of dropping the main frequency.

[0004] In a first aspect, an embodiment of this application provides a battery device, including a battery assembly and a heat insulation layer. The battery assembly includes a plurality of battery cells arranged in sequence along a first direction. The heat insulation layer is provided on at least one end face of the battery assembly in a second direction. The heat insulation layer is provided with a through hole that penetrates through two surfaces of the heat insulation layer that are opposite to each other in the second direction. A colloid is provided in the through hole. One end face of the colloid in the second direction is connected to the battery assembly, and the other end face of the colloid in the second direction is flush with the corresponding end face of the through hole or extends outside the through hole. The second direction is perpendicular to the first direction; the elasticity of the heat insulation layer is greater than the elasticity of the colloid.

[0005] The battery device provided by the embodiment of this application is provided with a through hole in the heat insulation layer, and a colloid is provided in the through hole. One end face of the colloid in the second direction is connected to the battery assembly, and the other end face of the colloid in the second direction is flush with the corresponding end face of the through hole or extends outside the through hole, so that the battery assembly can be connected to an adjacent target component through the colloid. In this way, when the battery device is subjected to vibration, at least some battery cells in the battery assembly can be pulled by the adjacent target component, reducing the probability of moving upward or downward, thereby reducing the risk of the electrical device using the battery device having the phenomenon of dropping the main frequency.

[0006] In addition, adopting the structure provided by this embodiment enables the colloid to be used to improve the strength of the battery device. The heat insulation layer can absorb the impact force received by the battery assembly while providing heat insulation, making the structure of the battery device stable and not easily damaged.

[0007] In some possible implementation manners, the battery device further includes a box body. The battery assembly and the heat insulation layer are both provided in the box body. The heat insulation layer includes a first heat insulation layer, and the first heat insulation layer is in contact with the first side wall of the box body. The first heat insulation layer is connected to the first side wall through a colloid.

[0008] The setting of the box body facilitates the overall setting of the battery device and is convenient for handling.

[0009] In some possible implementation manners, a plurality of battery assemblies are provided, at least two battery assemblies are arranged at intervals in a second direction, and are connected by a colloid.

[0010] When a plurality of battery assemblies are provided, the energy storage capacity of the battery device can be made relatively large, which can meet various usage scenarios. When at least two battery assemblies are arranged at intervals in the second direction and are connected by a colloid, it is convenient for at least some of the battery assemblies in the battery device to be connected into a whole through the colloid, thereby facilitating the overall assembly of the battery assemblies, and helping to reduce the risk of the occurrence of the main frequency drop phenomenon.

[0011] In some possible implementation manners, the number of battery cells in two battery assemblies connected by the same colloid is the same.

[0012] In this way, two battery assemblies connected by the same colloid can be placed side by side and aligned, which is convenient for design and installation.

[0013] In some possible implementation manners, in two connected battery assemblies, any battery cell in the same battery assembly corresponds to at least one through hole, and is connected to a battery cell in the other battery assembly through a colloid.

[0014] In this way, any battery cell in the same battery assembly can be connected to a battery cell in the other battery assembly, so that when the battery device is subjected to vibration, a sufficient number of battery cells can reduce the probability of moving upward or downward under the pulling of another battery cell, thereby reducing the risk of the occurrence of the main frequency drop phenomenon in the electrical device using the battery device.

[0015] In some possible implementation manners, the connected battery assembly and the heat insulation layer form a combined structure; in the same combined structure, any battery cell corresponds to at least one through hole.

[0016] By adopting the solution provided in this embodiment, in the same combined structure, any battery cell can be connected to a target component through one or more colloids, so that when the battery device is subjected to vibration, a sufficient number of battery cells can reduce the probability of moving upward or downward under the pulling of another battery cell, thereby reducing the risk of the occurrence of the main frequency drop phenomenon in the electrical device using the battery device.

[0017] In some possible implementation manners, in the same combined structure, any battery cell corresponds to a plurality of through holes.

[0018] By adopting the solution provided in this embodiment, in the same combined structure, any battery cell can be connected to a target component through multiple colloids. Compared with any battery cell being connected to a target component through only one colloid, the connection strength between the battery cell and the target component can be increased, and the risk of the occurrence of the main frequency drop phenomenon in the electrical device using the battery device can be further reduced.

[0019] In some possible implementations, there are multiple through holes.

[0020] In this way, the same battery assembly can be connected to other target components through multiple colloids. Compared with only one through hole, the risk of the power consumption device using the battery device experiencing a main frequency drop is lower.

[0021] In some possible implementations, the multiple through holes are arranged in an array.

[0022] The through holes arranged in an array are convenient for design and processing.

[0023] In some possible implementations, in the same battery assembly, multiple battery cells are all connected with colloids.

[0024] In this way, in the same battery assembly, multiple battery cells can be connected to the target component. Compared with only one battery cell being connected to the target component, the risk of the power consumption device using the battery device experiencing a main frequency drop is lower.

[0025] In some possible implementations, on the projection plane perpendicular to the second direction, the sum of the areas of the orthographic projections of all through holes is greater than or equal to 1 / 3 of the area of the orthographic projection of the heat insulation layer and less than the area of the orthographic projection of the heat insulation layer.

[0026] Adopting the solution provided in this embodiment can make it such that on at least one end face, along the second direction, the sum of the areas of the orthographic projections of all colloids is greater than or equal to 1 / 3 of the area of the orthographic projection of the heat insulation layer and less than the area of the orthographic projection of the heat insulation layer. In this way, the battery assembly can be connected to the target component through a sufficient amount of colloids, making the connection strength between the battery assembly and the target component relatively large, and further reducing the risk of the power consumption device using the battery device experiencing a main frequency drop.

[0027] In some possible implementations, on the projection plane perpendicular to the second direction, the sum of the areas of the orthographic projections of all through holes is 45% - 50% of the area of the orthographic projection of the heat insulation layer.

[0028] In this way, there can be a sufficient amount of colloids between the battery assembly and the target component to make the connection strength between the two relatively large, and at the same time, the volume of the heat insulation layer can be relatively large, which can absorb the vibrations in the direction of the battery assembly or other directions, helping to reduce the risk of the power consumption device using the battery device experiencing a main frequency drop and the risk of the battery device being damaged.

[0029] In some possible implementations, in the third direction perpendicular to both the first direction and the second direction, there is a spacing between the bottom surface of the through hole and the bottom surface of the heat insulation layer.

[0030] After the colloid is coated into the through hole in this way, the colloid can be blocked by the heat insulation layer and does not move in the direction of the bottom surface of the battery cell, thereby limiting the position of the colloid and reducing the probability of the colloid having an adverse effect on other structures of the battery device.

[0031] In some possible implementation manners, there is a spacing between each side wall of the through hole and the outer peripheral wall of the heat insulation layer.

[0032] After the colloid is coated into the through hole in this way, the colloid can be blocked by the heat insulation layer and cannot move in the direction of the bottom surface of the battery cell through the bottom of the through hole, nor can it flow to other areas of the battery cell through other inner walls of the through hole. Compared with the case where only the bottom surface of the through hole and the bottom surface of the heat insulation layer have a spacing, the position of the colloid can be better limited, and the probability of the colloid having an adverse effect on other structures of the battery device is reduced.

[0033] In a second aspect, an embodiment of the present application provides an electrical device, including the battery device provided by any of the above solutions.

[0034] The effects of the second aspect are the same as those of the first aspect, and will not be elaborated here.

[0035] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific implementation manners of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

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

[0038] Figure 2 is an exploded structural diagram of a battery device provided by some embodiments of the present application;

[0039] Figure 3 is a three-dimensional structural diagram of a battery device provided by some embodiments of the present application;

[0040] Figure 4 is a top view structural diagram of a battery device provided by some embodiments of the present application;

[0041] Figure 5Schematic side view structure of the battery device provided by some embodiments of the present application.

[0042] The reference numerals in the specific embodiments are as follows:

[0043] 1000, vehicle;

[0044] 100, battery device; 200, controller; 300, motor;

[0045] 10, box body; 11, cover body; 12, tray; 20, battery cell; 21, end face; 20a, battery assembly; 30, heat insulation layer; 31, through hole; 40, colloid;

[0046] X, first direction; Y, second direction; Z, height direction. Specific embodiments

[0047] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0050] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0051] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0052] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0053] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0055] If there is no special description, all the implementation manners and optional implementation manners of the present application can be combined with each other to form a new technical solution.

[0056] Based on the usage requirements of electrical devices (such as electric vehicles, consumer electronics, energy storage systems, etc.), battery devices are gradually developing towards the trend of increasing energy density and reducing weight. In the traditional CTP (Cell to Pack, module-free battery device) design, in order to improve the Z-direction main frequency and the strength of the box structure, multiple criss-crossing expansion beams are usually designed in the battery device to realize module limit through the expansion of battery cells and the extrusion force of the box. Although the criss-crossing expansion beams enhance the box structure, they also increase the weight of the battery device, which is not conducive to lightweight design; moreover, the expansion beams occupy the internal space of the battery device, reduce the arrangement efficiency of battery cells, and limit the improvement of energy density.

[0057] To optimize the number of horizontal and vertical beams of the traditional box body, improve the space utilization rate inside the box body, and thus enhance the energy density of the battery device, related technologies use elastic materials or structures (such as foam, elastic glue) to replace at least part of the rigid expansion beam, and absorb the expansion of battery cells through the elastic deformation of the materials. For example, silica gel pads or MPP (Microcellular Polypropylene) are used as the heat insulation layer between battery cells, which can not only limit the position but also insulate heat.

[0058] The heat insulation layer is generally connected to the battery cell through double-sided tape. During assembly, in the grouping process, the manipulator picks up the double-sided tape and pastes the double-sided tape at the preset position of the heat insulation layer or the battery cell through visual addressing and positioning; in the module stacking process, the manipulator sequentially grabs the battery cells and places them on the stacking table. The servo variable pitch tooling on the stacking table applies a certain pressure to the battery cells through variable pitch. The double-sided tape firmly bonds the adjacent battery cells and the heat insulation layer. One battery cell is arranged on each side of the heat insulation layer, and the two battery cells are pasted together through the double-sided tape and the heat insulation layer to meet the strength requirements. At the same time, the double-sided tape has a certain heat insulation function and can prevent the battery device from experiencing thermal runaway.

[0059] This kind of battery device can improve the energy density of the battery device to a certain extent, reduce the weight of the box body, and can also indirectly simplify the manufacturing process flow and improve the grouping efficiency. However, due to the large span of the battery module, the battery module is mainly limited by the expansion beams located on the left and right sides or the front and back sides of the battery module. And the battery module is composed of multiple battery cells and is not a whole. During use, if Z-direction (the height direction of the battery cell, which is also the height direction of the box body) vibration occurs, some battery cells in the battery module may move upward and / or downward, resulting in the occurrence of the phenomenon of dropped main frequency. The phenomenon of dropped main frequency usually refers to the sudden decrease in the main frequency (also known as the clock frequency) of the processor (CPU) of the electrical device when using battery power supply, resulting in a decline in performance. For the battery device or the electrical device, the phenomenon of dropped main frequency may bring a series of hazards. The hazards to the battery device include but are not limited to: reduced charge and discharge efficiency, shortened battery device life, risk of thermal runaway, and misoperation of the protection device. The hazards to the electrical device include but are not limited to: equipment damage, abnormal operation, reduced production efficiency, and data loss.

[0060] To at least partially improve the above problems, an embodiment of the present application provides a battery device. The battery device is provided with through holes in the heat insulation layer, and a colloid is arranged in the through holes, so that the battery assembly can be connected to an adjacent target component through the colloid. In this way, when the battery device is subjected to Z-direction vibration, at least some of the battery cells in the battery assembly can be pulled by the adjacent target component, reducing the probability of moving upward or downward, thereby reducing the risk of the main frequency drop phenomenon occurring in the electrical device using the battery device.

[0061] The battery device disclosed in the embodiment of the present application can be used in an electrical device that uses the battery device as a power source, or various energy storage devices, energy storage systems, and charging networks that use a battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0062] For the convenience of description in the following embodiments, a vehicle as an electrical device in an embodiment of the present application is taken as an example for description.

[0063] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device (Battery Apparatus) is arranged inside the vehicle 1000, and the battery device 100 can be arranged at the bottom, the head, or the 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. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0064] 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.

[0065] Please refer to Figure 2 , Figure 2 which is a schematic exploded view of the battery device provided in some embodiments of the present application. The battery device 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10.

[0066] Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a cover body 11 and a tray 12. Among them, the cover body 11 is covered on the tray, and together with the tray 12, they define an accommodation space for accommodating the battery cells 20. The tray 12 can be a hollow structure with an open end, and the cover body 11 can be a plate-like structure. The cover body 11 is covered on the open side of the tray 12 so that the cover body 11 and the tray 12 together define an accommodation space; the cover body 11 and the tray 12 can also both be hollow structures with open sides on the side, and the open side of the cover body 11 is covered on the open side of the tray 12. Of course, the box body 10 formed by the cover body 11 and the tray 12 can be of various shapes, such as a circular through-hole part, a cuboid, etc. The above-mentioned tray 12 is an important structural load-bearing part in the battery system, which is used to store and protect the battery cells, and at the same time has an important impact on the collision safety of the whole vehicle and the torsional and bending stiffness of the whole body.

[0067] A plurality of battery cells 20 can be provided. The plurality of battery cells 20 are connected in series, parallel or in a hybrid connection through a busbar component. A hybrid connection means that there are both series and parallel connections among the plurality of battery cells 20. The plurality of battery cells 20 can be directly connected in series, parallel or in a hybrid connection together, and then the whole formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery device 100 can also be that a plurality of battery cells 20 are first connected in series, parallel or in a hybrid connection to form a battery module form, and then a plurality of battery modules are connected in series, parallel or in a hybrid connection to form a whole and are accommodated in the box body 10. The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing the electrical connection between the plurality of battery cells 20. As an example, a plurality of battery cells 20 can form a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 20 to form an independent module. As an example, the battery module can be formed by tying a plurality of battery cells 20 with a cable tie.

[0068] Among them, the battery cell 20 refers to the smallest unit that makes up the battery. Each battery cell 20 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell that can activate the active material and continue to be used by charging after the battery cell 20 discharges. The battery cell 20 can be 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto. The battery cell can be in the shape of a circular through-hole part, a flat body, a cuboid or other shapes, etc.

[0069] Please refer to Figures 3 to 5 , Figure 3 which is a schematic three-dimensional structure diagram of the battery device provided by some embodiments of the present application, Figure 4A top - view structural schematic diagram of a battery device provided by some embodiments of the present application. Figure 5 A side - view structural schematic diagram of a battery device provided by some embodiments of the present application. Some embodiments of the present application provide a battery device 100. The battery device 100 includes a battery assembly 20a and a heat - insulating layer 30. The battery assembly 20a includes a plurality of battery cells 20 arranged in sequence along a first direction X. The heat - insulating layer 30 is provided on at least one end face 21 of the battery assembly 20a in a second direction Y. The heat - insulating layer 30 is provided with a through - hole 31. The through - hole 31 penetrates through two surfaces of the heat - insulating layer 30 that are opposite to each other in the second direction Y. A colloid 40 is provided in the through - hole 31. One end face of the colloid 40 in the second direction Y is connected to the battery assembly 20a, and the other end face in the second direction Y is flush with the corresponding end face of the through - hole 31 or extends outside the through - hole 31. The second direction Y is perpendicular to the first direction X.

[0070] In the same battery assembly 20a, the battery cells 20 generally have large surfaces in contact. The battery cell 20 generally has a plurality of outer surfaces, and the above - mentioned large surface is the plane with the largest area among the outer surfaces. For square batteries and soft - pack batteries, the large surfaces are also the front and back surfaces of the battery cell 20.

[0071] The first direction X can be determined according to the usage requirements. When the battery cell 20 is a square battery and the large surfaces of two adjacent battery cells 20 in the battery assembly 20a are in contact, the first direction X is the thickness direction of the battery cell 20; when the battery cell 20 is a cylindrical battery, the first direction X is the radial direction of the battery cell 20.

[0072] The fact that the second direction Y is perpendicular to the first direction X means that the second direction Y is a direction that is basically perpendicular to the first direction X. Basically perpendicular means that the second direction Y and the first direction X are set at an angle of 90° plus or minus an error angle. The error angle can be determined according to the processing error. For example, any angle within 10° can be adopted, or any angle within 5° can be adopted.

[0073] The heat - insulating layer 30 is an important functional material, mainly used to prevent heat transfer between battery cells 20, reduce the risk of thermal runaway, and improve the safety and reliability of the battery device 100. The material of the heat - insulating layer 30 can be selected according to the usage requirements. For example, one or more of rubber, ceramic fiber, aerogel, mica sheet, silica gel foam, aramid fiber, phase - change material, etc. can be selected. The heat - insulating layer 30 can be a single - layer structure or a multi - layer structure, which can be specifically determined according to the usage requirements.

[0074] The end face 21 of the battery cell 20 in the second direction Y is the side face that connects the two large faces in the battery cell 20. The end face 21 of the battery assembly 20a in the second direction Y is the face formed by the end faces 21 of the plurality of battery cells 20 in the battery assembly 20a in the second direction Y. The heat insulation layer 30 is provided on at least one end face 21 of the battery assembly 20a in the second direction Y, which means that there are two end faces 21 arranged opposite to each other in the second direction Y of the battery assembly 20a. The heat insulation layer 30 can be provided on any one of the end faces 21, or the heat insulation layer 30 can be provided on each end face 21.

[0075] The through hole 31 is a through hole that penetrates the two surfaces of the heat insulation layer 30 arranged opposite to each other in the second direction Y. That is, the colloid 40 located in the through hole 31 can be connected to the end face 21 of the battery cell 20.

[0076] The colloid 40 can be any colloid that can be used for connecting the battery cells 20, such as epoxy resin colloid, polyurethane colloid, silicone colloid, acrylic colloid, etc., and can be specifically determined according to the usage requirements.

[0077] One end face of the colloid 40 in the second direction Y is connected to the battery assembly 20a, and the other end face in the second direction Y is flush with the corresponding end face of the through hole 31 or extends outside the through hole 31. This facilitates the connection of the colloid 40 with the target component on one side of the battery assembly 20a. The target component can be another battery assembly 20a, or a box body, a vehicle body, etc., as long as it can reduce the upward and / or downward movement of the battery cells 20 in the battery assembly 20a when the battery assembly 20a is subjected to Z-direction vibration.

[0078] Among them, the corresponding end face of the through hole 31 refers to the end face of the end of the through hole 31 facing away from the battery assembly 20a. It can be understood that when the colloid 40 connects two battery assemblies 20a, one end face of the colloid 40 in the second direction Y is connected to the battery assembly 20a, and the other end face in the second direction Y is flush with the corresponding end face of the through hole 31 or extends outside the through hole 31, which means that one end of the colloid 40 can be connected to one battery assembly 20a, and the other end can be connected to another battery assembly 20a.

[0079] The battery device 100 provided by the embodiment of the present application is provided with a through hole 31 in the heat insulation layer 30, and a colloid 40 is arranged in the through hole 31. One end face of the colloid 40 in the second direction Y is connected to the battery assembly 20a, and the other end face in the second direction Y is flush with the corresponding end face of the through hole 31 or extends outside the through hole 31, so that the battery assembly 20a can be connected to an adjacent target component through the colloid 40. In this way, when the battery device 100 is subjected to Z-direction vibration, at least some of the battery cells 20 in the battery assembly 20a can be pulled by the adjacent target component, reducing the probability of moving upward or downward, thereby reducing the risk of the main frequency drop phenomenon occurring in the electrical device using the battery device 100.

[0080] In addition, the battery device 100 provided by the embodiment of the present application has a simple structure and low cost. There is no need to set a pressing strip in the box body 10 to prevent the battery cell 20 from moving upward, which will not have a great impact on the manufacturing cost of the battery device 100, achieving multiple benefits at one stroke.

[0081] As Figure 2 and Figure 3 As shown, in some embodiments, the battery device 100 further includes a box body 10. The battery assembly 20a and the heat insulation layer 30 are both arranged in the box body 10. The heat insulation layer 30 includes a first heat insulation layer. The first heat insulation layer is connected to the first side wall of the box body 10. The first heat insulation layer is connected to the first side wall through the colloid 40.

[0082] The first heat insulation layer being connected to the first side wall of the box body 10 means that the first heat insulation layer is connected to or in contact with the first side wall of the box body 10.

[0083] The first heat insulation layer refers to at least one heat insulation layer in the heat insulation layer 30 that is in contact with the side wall of the box body 10.

[0084] The first side wall of the box body 10 refers to the side wall of the box body 10 that can be in contact with the first heat insulation layer. For example, it can be the side wall surrounding the box body 10, or an expansion beam arranged in the box body 10, which can be specifically determined according to the use requirements.

[0085] Adopting the solution provided by this embodiment, the setting of the box body 10 facilitates the overall setting of the battery device 100 and is convenient for handling.

[0086] In some embodiments, there are multiple battery assemblies 20a. At least two battery assemblies 20a are arranged at intervals in the second direction Y and are connected through the colloid 40.

[0087] At least two battery components 20a are arranged at intervals along the second direction Y and are connected by a colloid 40, including the following situations: First, all the battery components 20a in the battery device are arranged at intervals along the second direction Y and are sequentially connected by the colloid 40; Second, a part of the battery components 20a in the battery device are arranged at intervals along the second direction Y and are sequentially connected by the colloid 40, and the other part of the battery components 20a are arranged in other ways.

[0088] If there are multiple battery components 20a, the energy storage capacity of the battery device 100 can be made larger, which can meet various usage scenarios. At least two battery components 20a are arranged at intervals along the second direction Y and are connected by a colloid 40, which facilitates at least some of the battery components 20a in the battery device to be connected into a whole through the colloid 40, thereby facilitating the overall assembly of the battery components 20a and helping to reduce the risk of the occurrence of the phenomenon of dropping the main frequency.

[0089] In some embodiments, there are multiple through holes 31.

[0090] In this way, two adjacent battery components 20a can be connected by multiple colloids 40. Compared with only one through hole 31 provided, the connection between two adjacent battery components 20a can be made more stable and the structural strength can be greater.

[0091] In some embodiments, the number of battery cells 20 in two battery components 20a connected by the same colloid 40 is the same.

[0092] In this way, two battery components 20a connected by the same colloid 40 can be placed side by side and aligned, which is convenient for design and installation.

[0093] In some embodiments, in two connected battery components 20a, any battery cell 20 in the same battery component 20a corresponds to at least one through hole 31 and is connected to a battery cell 20 in the other battery component 20a through a colloid 40.

[0094] In this way, any battery cell 20 in the same battery component 20a can be connected to a battery cell 20 in the other battery component 20a. When the battery device 100 is subjected to Z-direction vibration, enough battery cells 20 can reduce the probability of moving upward or downward under the pull of another battery cell 20, thereby reducing the risk of the phenomenon of dropping the main frequency of the electrical device using the battery device 100.

[0095] In some embodiments, the connected battery components 20a and the heat insulation layer 30 form a combined structure. In the same combined structure, any battery cell 20 corresponds to at least one through hole 31.

[0096] It can be understood that since the battery module 20a can be connected to the side wall of the box body 10 and / or another battery module 20a through the colloid 40, the connected battery modules 20a and the heat insulation layer 30 can be two battery modules 20a and one heat insulation layer 30, or one battery module 20a and one heat insulation layer 30. That is, the combined structure can be composed of two battery modules 20a, the heat insulation layer 30 and the colloid 40 between the two battery modules 20a, or can be composed of one heat insulation layer 30, one battery module 20a and the colloid 40 therebetween.

[0097] In the same combined structure, any battery cell 20 corresponding to at least one through hole 31 means that in the same combined structure, at least one through hole 31 is provided on the part of the heat insulation layer 30 in contact with any battery cell 20.

[0098] By adopting the solution provided in this embodiment, in the same combined structure, any battery cell 20 can be connected to the target component through one or more places of the colloid 40, so that when the battery device 100 is subjected to Z-direction vibration, enough battery cells 20 can reduce the probability of moving upward or downward under the pulling of another battery cell 20, thereby reducing the risk of the power-consuming device using the battery device 100 having a main frequency drop phenomenon.

[0099] In some embodiments, in the same combined structure, any battery cell 20 corresponds to a plurality of through holes 31.

[0100] In the same combined structure, any battery cell 20 corresponding to a plurality of through holes 31 means that in the same combined structure, a plurality of through holes 31 are provided on the part of the heat insulation layer 30 in contact with any battery cell 20.

[0101] By adopting the solution provided in this embodiment, in the same combined structure, any battery cell 20 can be connected to the target component through multiple places of the colloid 40. Compared with any battery cell 20 being connected to the target component through only one place of the colloid 40, the connection strength between the battery cell 20 and the target component can be increased, and the risk of the power-consuming device using the battery device 100 having a main frequency drop phenomenon can be further reduced.

[0102] In some embodiments, there are a plurality of through holes 31.

[0103] In this way, the same battery module can be connected to other target components through multiple places of the colloid 40. Compared with only one through hole 31 being provided, the risk of the power-consuming device using the battery device having a main frequency drop can be lower.

[0104] In some embodiments, the plurality of through holes 31 are arranged in an array.

[0105] An array arrangement refers to arranging multiple through-holes 31 in a specific structure or pattern according to certain rules and orders. In this embodiment, the through-holes 31 can be arranged in a linear array, a rectangular array, etc., which can be determined according to actual usage needs.

[0106] The through-holes 31 are arranged in an array, which is convenient for design and processing.

[0107] In some embodiments, in the same battery assembly 20a, a plurality of battery cells 20 are all connected with a colloid 40.

[0108] In this way, in the same battery assembly 20a, a plurality of battery cells 20 can be connected to a target component. Compared with only one battery cell 20 being connected to the target component, the risk of the power-consuming device using the battery device experiencing a dropped main frequency is lower.

[0109] In some embodiments, the elasticity of the heat insulation layer 30 is greater than that of the colloid 40.

[0110] In the mechanical field, elasticity generally refers to the ability of a material or structure to deform when subjected to an external force and return to its original state after the external force is removed. Elasticity mainly depends on the elastic modulus (Young's Modulus) and the resilience performance of the material. The elasticity of the heat insulation layer 30 being greater than that of the colloid 40 means that the elastic modulus or resilience ability of the heat insulation layer 30 is stronger than that of the colloid 40, indicating that when the heat insulation layer 30 and the colloid 40 are subjected to the same external force, the heat insulation layer 30 can undergo a greater deformation and can better return to its original state.

[0111] To make the elasticity of the heat insulation layer 30 greater than that of the colloid 40, it is necessary to optimize the elasticity of the heat insulation layer 30 from aspects such as material selection, structural design, and composite reinforcement, while controlling the elasticity of the colloid 40 to be relatively low. For example, the heat insulation layer 30 can be made of a highly elastic heat insulation material so that its elastic modulus (resilience ability) is better than that of the colloid 40. For example, the heat insulation layer 30 can be made of at least one of flexible aerogels (such as silicone rubber composite aerogels, which have good elasticity and heat insulation), elastic foam materials (such as polyurethane foam, EPDM rubber foam), nanoporous elastomers (such as graphene-reinforced elastic heat insulation materials), fiber-reinforced heat insulation layers (such as glass fiber + elastic matrix), etc. The colloid 40 can be made of a low-elasticity colloid or its elasticity can be reduced by modification. For example, the colloid 40 can be made of a highly filled colloid (such as adding a large amount of inorganic fillers to reduce the resilience) or a high-damping colloid (such as adding asphalt or clay to increase plastic deformation).

[0112] In addition, the greater elasticity of the heat insulation layer 30 than that of the colloid 40 can also be achieved through structural optimization. For example, the heat insulation layer 30 can adopt a porous / honeycomb structure (the heat insulation layer 30 adopts an elastic porous design and recovers after being compressed) or a spring support layer (miniature springs or elastic fiber meshes are embedded in the heat insulation layer 30). The colloid 40 can adopt a dense non-porous structure (such as a solid silica gel block with poor elasticity) or random disordered filling (such as granular filled colloid, which hinders rebound). With the structure provided in this embodiment, the colloid 40 can be used to improve the strength of the battery device 100, and the heat insulation layer 30 can absorb the impact force received by the battery assembly 20a while providing heat insulation, making the structure of the battery device 100 stable and not easily damaged.

[0113] In some embodiments, on the projection plane perpendicular to the second direction Y, the sum of the areas of the orthographic projections of all the through holes 31 is greater than or equal to 1 / 3 of the area of the orthographic projection of the heat insulation layer 30 and less than the area of the orthographic projection of the heat insulation layer 30.

[0114] The orthographic projections of the through holes 31 and the heat insulation layer 30 are both with respect to the projection plane perpendicular to the second direction Y. The orthographic projection is the projection formed when the projection line is perpendicular to the projection plane.

[0115] By adopting the solution provided in this embodiment, on the projection plane perpendicular to the second direction Y, the sum of the areas of the orthographic projections of all the colloids 40 is greater than or equal to 1 / 3 of the area of the orthographic projection of the heat insulation layer 30 and less than the area of the orthographic projection of the heat insulation layer 30. In this way, the battery assembly 20a can be connected to the target component through a sufficient amount of the colloid 40, so that the connection strength between the battery assembly 20a and the target component is relatively large, and further the risk of the power-consuming device using the battery device 100 experiencing a main frequency drop is relatively small.

[0116] In some embodiments, on the projection plane perpendicular to the second direction Y, the sum of the areas of the orthographic projections of all the through holes 31 is 45%-50% of the area of the orthographic projection of the heat insulation layer 30.

[0117] This can ensure that there is a sufficient amount of the colloid 40 between the battery assembly 20a and the target component to make the connection strength between the two relatively large, and at the same time, the volume of the heat insulation layer 30 can be relatively large, which can absorb the Z-direction vibration or vibration in other directions received by the battery assembly 20a, helping to reduce the risk of the power-consuming device using the battery device 100 experiencing a main frequency drop and the risk of the battery device 100 being damaged.

[0118] In some embodiments, in the third direction Z perpendicular to both the first direction X and the second direction Y, there is a spacing between the bottom surface of the through hole 31 and the bottom surface of the heat insulation layer 30.

[0119] Having a spacing means that there is a part of the heat insulation layer 30 between the bottom surface of the through hole 31 and the bottom surface of the heat insulation layer 30. After the colloid 40 is coated into the through hole 31 in this way, the colloid 40 can be blocked by the heat insulation layer 30 and does not move in the direction of the bottom surface of the battery cell 20, thereby limiting the position of the colloid 40 and reducing the probability of the colloid 40 having an adverse effect on other structures of the battery device 100.

[0120] In some embodiments, there is a spacing between each side wall of the through hole 31 and the outer peripheral wall of the heat insulation layer 30.

[0121] That there is a spacing between each side wall of the through hole 31 and the outer peripheral wall of the heat insulation layer 30 means that there is a part of the heat insulation layer 30 between each side wall of the through hole 31 and the outer peripheral wall of the heat insulation layer 30.

[0122] After the colloid 40 is coated into the through hole 31 in this way, the colloid 40 can be blocked by the heat insulation layer 30 and not only cannot move in the direction of the bottom surface of the battery cell 20 through the bottom of the through hole 31, but also cannot flow to other areas of the battery cell 20 through other inner walls of the through hole 31. Compared with the case where only the bottom surface of the through hole 31 and the bottom surface of the heat insulation layer 30 have a spacing, the position of the colloid 40 can be better limited, and the probability of the colloid 40 having an adverse effect on other structures of the battery device 100 is reduced.

[0123] In some embodiments, in the second direction Y, the size of the colloid 40 is greater than or equal to the size of the heat insulation layer 30.

[0124] This helps the colloid 40 to connect the battery assembly 20a and the target component simultaneously.

[0125] In some embodiments, in the second direction Y, the size of the colloid 40 is the size of the heat insulation layer 30 plus 1 mm.

[0126] This not only helps the colloid 40 to connect the battery assembly 20a and the target component simultaneously, but also enables both the battery assembly 20a and the target component to be in contact with the heat insulation layer 30, facilitating the heat insulation layer 30 to absorb the vibrations received by the battery assembly 20a and / or the target component.

[0127] According to some embodiments of the present application, the present application also provides an electrical device, including the battery device provided in any of the above solutions. The battery device is used to store or provide electrical energy.

[0128] The electrical device can be any of the aforementioned devices or systems that use a battery.

[0129] The electrical device provided by the embodiments of the present application, including the above battery device, can achieve the same effects, which will not be elaborated here.

[0130] Such as Figures 2 to 5As shown in the figure, an embodiment of the present application provides a battery device 100. The battery device 100 includes a box body 10, and a battery assembly 20a and a heat insulation layer 30 both arranged in the box body 10. The battery assembly 20a includes a plurality of battery cells 20 arranged in sequence along a first direction X. The heat insulation layer 30 is arranged along the first direction X, and the heat insulation layer 30 is arranged on at least one end face 21 of the battery assembly 20a in a second direction Y. The heat insulation layer 30 is provided with a through hole 31, and the through hole 31 penetrates through two surfaces of the heat insulation layer 30 arranged opposite to each other in the second direction Y. The through hole 31 is filled with a colloid 40. The battery assembly 20a is connected to a target component through the colloid 40. The target component includes a side wall of the box body 10 and / or another battery assembly 20a. The second direction Y is perpendicular to the first direction X.

[0131] There are a plurality of battery assemblies 20a, and at least two battery assemblies 20a are arranged at intervals along the second direction Y. The number of battery cells 20 in two battery assemblies 20a connected by the same colloid 40 is the same.

[0132] Any battery cell 20 in the same battery assembly 20a is connected to a battery cell 20 in another battery assembly 20a through the colloid 40.

[0133] In the same combined structure, any battery cell 20 corresponds to a plurality of through holes 31.

[0134] The through holes 31 are arranged in an array.

[0135] The elasticity of the heat insulation layer 30 is greater than the elasticity of the colloid 40.

[0136] On a projection plane perpendicular to the second direction Y, the sum of the areas of the orthographic projections of all the through holes 31 is 45%-50% of the area of the orthographic projection of the heat insulation layer 30.

[0137] There is a distance between each side wall of the through hole 31 and the outer peripheral wall of the heat insulation layer 30.

[0138] In the second direction Y, the size of the colloid 40 is 1 mm larger than the size of the heat insulation layer 30.

[0139] In the related art, after the battery modules 20a are assembled, in order to prevent the risk of thermal runaway of the battery cells 20 between the two battery modules 20a, a heat insulation layer 30 (which can be an MPP buffer pad) needs to be provided between the battery cells 20 of the two battery modules 20a. In the traditional solution, the heat insulation layer 30 is pasted on the side of the battery module 20a, and the quantity and distribution are in the form of 3 battery modules 20a + 2 heat insulation layers 30, that is, three battery modules 20a are arranged in sequence, and a heat insulation layer 30 is provided between adjacent two battery modules 20a. The thickness of the heat insulation layer 30 in the middle is thinner than that on both sides. In this structure, the heat insulation layer 30 only has the function of protecting against thermal runaway and no structural strength function. The structural strength of the battery module 20a is mainly provided by the back glue (or double-sided glue), and the improvement effect on the strength is small, and it cannot meet the vibration requirements under harsh working conditions.

[0140] In the battery device 100 adopted in this embodiment, a heat insulation layer 30 is also provided on the side of the battery module 20a, and it is a whole heat insulation layer 30. The heat insulation layer 30 is connected to the battery module 20a through the back glue. An array of hollow structures (i.e., the above-mentioned through holes 31) is formed on the heat insulation layer 30 according to a certain size, and a colloid 40 is applied to the hollow structure. When the battery modules 20a are assembled, the battery modules 20a are extruded to make the colloid 40 bond the two battery modules 20a together, improving the overall structural strength of the battery modules 20a.

[0141] Specifically, in this embodiment, a plurality of battery cells 20 are stacked in sequence along the arrangement direction to form a plurality of battery modules 20a. Then, a heat insulation layer 30 is placed between adjacent two battery modules 20a, and the heat insulation layer 30 is bonded between the adjacent two battery modules 20a through the glue (or double-sided glue) coated on the front and back surfaces of the heat insulation layer 30. Among them, through holes 31 for applying glue are provided on the heat insulation layer 30, and a colloid 40 is applied to the through holes 31. The heat insulation layer 30 can also prevent the colloid 40 from flowing to the bottom of the battery cell 20. At the module grouping station, the pressurizing mechanism of the grouping table applies pressure to the side of the battery cell 20 through servo variable pitch to activate the glue (or double-sided glue) and the colloid 40, and a stable whole is formed between the battery cells 20, ensuring the connection strength between adjacent single battery cells, and at the same time reducing the occurrence of thermal runaway between the two single cells.

[0142] Open-hole design of the thermal insulation layer 30: On the large surface where the thermal insulation layer 30 contacts the battery module 20a, multiple rows of long-strip holes are opened along the stress direction. The width dimension of the holes can be determined according to the thickness of the battery cell 20, for example, it can be 20 mm - 25 mm. A colloid 40 is coated in the open-hole area. The thickness of the colloid 40 is generally greater than the thickness of the thermal insulation layer 30, for example, it can be 3 mm - 4 mm. A through-hole 31 is provided on the thermal insulation layer 30, which can reduce local stress and solve the problem of thermal runaway between two battery cells 20 at the same time. After the colloid 40 and the battery cell 20 are bonded, the entire module is in an integral body, and the main frequency will increase during the Z-direction vibration and impact process.

[0143] In addition, to improve the problem of the main frequency drop, in the related technology, a pressing strip connected to the box body 10 is added to the shoulder of the battery module 20a. The preparation of the pressing strip requires adding 5 workstations including a shoulder cleaning workstation, a shoulder glue coating workstation, a shoulder pressing strip installation workstation, a shoulder pressing workstation, and a pressing strip locking workstation in the battery device 100 grouping and assembly section. Among them, the shoulder cleaning workstation is used to remove dust, oil or other contaminants on the shoulder of the battery cell 20 (usually referring to a specific area on the battery top cover or side surface) to ensure the bonding effect of subsequent glue coating and pressing strip installation; the shoulder glue coating workstation is used to coat glue on the shoulder of the battery cell 20 to fix the pressing strip, seal the gap or enhance the structural strength; the shoulder pressing strip installation workstation is used to install the pressing strip on the shoulder of the battery cell 20 to fix the battery cell 20, disperse the expansion force or enhance the module structural strength; the shoulder pressing workstation is used to apply a certain pressure to the installed pressing strip to ensure that the pressing strip is tightly bonded to the shoulder of the battery cell 20 and activate the viscosity of the glue at the same time; the pressing strip locking workstation is used to further fix the pressing strip through locking (such as bolts, rivets or buckles) to ensure that it will not loosen or fall off during the use of the battery module 20a.

[0144] It should be noted that since double-sided tape is pasted on the side surface of the battery cell 20, during the above-mentioned shoulder glue coating process, the glue coated on the battery cell 20 will be blocked by the double-sided tape when flowing to the bottom of the battery cell 20, so that the glue only adheres to the window area on the shoulder of the battery cell 20. Using the above method can have a certain effect on improving the Z-direction main frequency, but it also increases the manufacturing cost.

[0145] By using the battery device 100 provided in this embodiment of the application, not only can it have a certain effect on improving the Z-direction main frequency, but also the battery device 100 can cancel the shoulder glue coating workstation, the pressing strip installation workstation and the pressing strip pressing workstation, reducing the probability of blue film breakage and insulation failure caused by the interference between the pressing strip and the shoulder of the battery cell 20 at the product design level.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: The invention comprises a battery assembly and a heat-insulating layer, wherein the battery assembly comprises a plurality of battery cells arranged in sequence along a first direction, the heat-insulating layer is arranged on at least one end face of the battery assembly in a second direction, the heat-insulating layer is provided with a through hole, the through hole penetrates two surfaces of the heat-insulating layer arranged opposite to each other in the second direction, a colloid is arranged in the through hole, one end face of the colloid in the second direction is connected to the battery assembly, and the other end face in the second direction is flush with the corresponding end face of the through hole or extends outside the through hole, and the second direction is perpendicular to the first direction; The elasticity of the heat insulating layer is greater than the elasticity of the colloid.

2. The battery device according to claim 1, characterized in that The battery device also includes a box body, the battery assembly and the thermal insulation layer are both arranged in the box body, the thermal insulation layer includes a first thermal insulation layer, the first thermal insulation layer is connected to the first side wall of the box body, and the first thermal insulation layer is connected to the first side wall through the colloid.

3. The battery device according to claim 1, characterized in that: There are a plurality of battery assemblies, and at least two of the battery assemblies are spaced apart along the second direction and connected by the colloid.

4. The battery device according to claim 3, characterized in that: The numbers of the battery cells in the two battery assemblies connected by the same colloid are the same.

5. The battery device according to claim 4, characterized in that: In the two connected battery assemblies, any battery cell in the same battery assembly corresponds to at least one through hole, and is connected to the battery cell in the other battery assembly through the colloid.

6. The battery device according to claim 5, characterized in that The connected battery assembly and the heat insulation layer form a combined structure; in the same combined structure, any battery cell corresponds to at least one through hole.

7. The battery device according to claim 6, characterized in that: In the same combined structure, any one of the battery cells corresponds to a plurality of the through holes.

8. The battery device according to any one of claims 1 to 7, characterized in that: There are a plurality of through holes.

9. The battery device according to claim 8, characterized in that: The plurality of through holes are arranged in an array.

10. The battery device according to claim 8, characterized in that In the same battery assembly, a plurality of battery cells are all connected to the colloid.

11. The battery device according to any one of claims 1 to 7, characterized in that: On a projection plane perpendicular to the second direction, the sum of the areas of the orthographic projections of all the through holes is greater than or equal to 1 / 3 of the area of ​​the orthographic projection of the thermal insulation layer and is smaller than the area of ​​the orthographic projection of the thermal insulation layer.

12. The battery device according to any one of claims 1 to 7, characterized in that: In a third direction perpendicular to both the first direction and the second direction, the sum of the areas of the orthographic projections of all the through holes is 45%-50% of the area of ​​the orthographic projection of the thermal insulation layer.

13. The battery device according to any one of claims 1 to 7, characterized in that: In a third direction perpendicular to both the first direction and the second direction, a gap exists between a bottom surface of the through hole and a bottom surface of the heat insulation layer.

14. The battery device according to any one of claims 1 to 7, characterized in that: There is a distance between each side wall of the through hole and the outer peripheral wall of the heat insulation layer.

15. An electrical device, characterized in that: Comprising a battery device according to any one of claims 1-14.

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