Battery device, electric equipment and heat insulation piece

Abstract

The utility model relates to the technical field of batteries, in particular to a battery device, electric equipment and a heat insulation part. According to the embodiment of the invention, the thermal insulation piece is arranged between the large surfaces of the two adjacent single batteries, so that thermal runaway of the battery device can be reduced and delayed. Due to the fact that the deformability of the central area of the heat insulation part is larger than that of the edge area of the heat insulation part, large-area subareas of the corresponding single batteries can be buffered and supported to different degrees when the heat insulation part is subjected to related acting force, the situation of stress concentration is improved, the corresponding single batteries are protected, and the service life of the batteries is prolonged. And the heat insulation part can be kept in a relatively good fit state with the large surface of the corresponding battery monomer, so that heat is improved to pass through a gap between the battery monomer and the heat insulation part to form a new heat conduction path, the heat insulation effect of the heat insulation part is improved, and the thermal runaway of the battery can be prevented and buffered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device, an electrical equipment and a thermal insulation piece. BACKGROUND

[0002] With the development of new energy technology, batteries are more and more widely used in the market, and people's requirements for battery performance are also getting higher and higher, such as the requirement for energy density. However, the residual energy of a battery cell with high energy density is large after thermal runaway, and when one of the battery cells is in thermal runaway, the heat will continue to conduct from one battery cell to the adjacent battery cell, thereby causing thermal diffusion of the entire battery device and causing damage to the entire battery device. Therefore, how to slow down the thermal runaway of the battery device is a problem to be solved. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a battery device and an electrical equipment to slow down the thermal runaway of the battery device.

[0004] In a first aspect, the present application provides a battery device, comprising a plurality of battery cells; and a thermal insulation piece arranged between large faces of at least two adjacent battery cells; the thermal insulation piece comprises a center region and an edge region arranged around the center region, and a projection of the center region on the large face of the corresponding battery cell covers the center of the corresponding large face, and the deformability of the center region is greater than that of the edge region.

[0005] In the technical scheme of the present application, the thermal insulation piece is arranged between the large faces of the two adjacent battery cells, which can reduce and slow down the thermal runaway of the battery device. Since the deformability of the center region of the thermal insulation piece is greater than that of the edge region of the thermal insulation piece, not only can the large face of the corresponding battery cell be buffered and supported to different degrees when subjected to relevant forces, the stress concentration situation can be improved, and the corresponding battery cell can be protected, thereby improving the reliability of the battery cell, but also the large face of the corresponding battery cell can be kept in a relatively good state of adhesion, thereby improving the formation of a new heat conduction path through the gap between the battery cell and the thermal insulation piece, which is conducive to improving the heat insulation effect of the thermal insulation piece, thereby slowing down the thermal runaway of the battery.

[0006] In some embodiments, the thermal insulation piece comprises a packaging layer having a containing cavity, a support structure arranged in the containing cavity, and a thermal insulation material arranged in the space defined by the support structure and the inner wall of the containing cavity.

[0007] In this way, by arranging the support structure in the thermal insulation piece, not only can the thermal insulation piece have certain heat insulation performance and certain structural strength, thereby improving the reliability of the thermal insulation piece, but also the stress acting on the thermal insulation piece can be dispersed by means of the support structure.

[0008] In some embodiments, the support structure is provided with a plurality of through holes arranged along a thickness direction of the support structure, and at least part of the thermal insulation is accommodated in the plurality of through holes; in a cross section perpendicular to the thickness direction of the support structure, a minimum cross-sectional area of the through hole located in the central region is greater than a maximum cross-sectional area of the through hole located in the edge region; the thickness direction of the support structure is parallel to the arrangement direction of the two adjacent battery monomers.

[0009] In this way, by arranging the through holes, it is not only beneficial to manufacture the support structure, but also beneficial to improve the utilization rate of the accommodation cavity. Since the cross-sectional area of the through hole located in the central region is greater than the cross-sectional area of the through hole located in the edge region, not only does the central region of the thermal insulation part have greater deformability than the edge region, thereby facilitating the buffering and supporting of the large surface of the battery monomer, but also it is beneficial to accommodate more thermal insulation in the central region of the thermal insulation part, further improving the thermal insulation effect of the central region of the thermal insulation part.

[0010] In some embodiments, the support structure includes a central part located in the central region and an edge part located in the edge region; wherein the maximum thickness of the central part is less than the minimum thickness of the edge part; or the thickness of the central part is equal to the thickness of the edge part.

[0011] In this way, by arranging the maximum thickness of the central part of the support structure to be less than the minimum thickness of the edge part, not only does the central part of the support structure have a certain supporting ability, but also the central region of the thermal insulation part has a larger deformable space, thereby making the deformability of the central region of the thermal insulation part greater than the deformability of the edge region. By arranging the thickness of the central part of the support structure to be equal to the thickness of the edge part, not only can the central region and the edge region of the thermal insulation part both have a certain structural strength, but also it is beneficial to manufacture the support structure.

[0012] In some embodiments, in a cross section perpendicular to the thickness direction of the support structure, the cross-sectional shape of the through hole located in the central region at least includes a hexagon; and / or, in a cross section perpendicular to the thickness direction of the support structure, the cross-sectional shape of the through hole located in the edge region at least includes a hexagon.

[0013] In this way, by arranging the cross-sectional shape of the through hole located in the central region to at least include a hexagon, it is beneficial to further improve the structural strength of the central region of the thermal insulation part. By arranging the cross-sectional shape of the through hole located in the edge region to at least include a hexagon, it is beneficial to further improve the structural strength of the edge region of the thermal insulation part.

[0014] In some embodiments, the thermal insulation further comprises a transition region; the transition region is disposed around the center region, and the edge region is disposed around the transition region; in a cross section perpendicular to the thickness direction of the support structure, the minimum cross-sectional area of the through hole in the center region is greater than the maximum cross-sectional area of the through hole in the transition region, and the minimum cross-sectional area of the through hole in the transition region is greater than the maximum cross-sectional area of the through hole in the edge region.

[0015] In this way, by disposing the transition region between the center region and the edge region, and setting the size of the cross-sectional area of the through hole in the transition region to be between the size of the cross-sectional area of the through hole in the center region and the size of the cross-sectional area of the through hole in the edge region, the deformability of the transition region is less than the deformability of the center region and greater than the deformability of the edge region, so that the transition region can receive the stress transmitted from the center region and further transmit the stress to the edge region more gently, which is beneficial to improve the stability and reliability of the thermal insulation.

[0016] In some embodiments, the support structure comprises a center portion in the center region, a transition portion in the transition region, and an edge portion in the edge region; wherein the maximum thickness of the center portion is less than the minimum thickness of the edge portion; or the maximum thickness of the center portion is less than the minimum thickness of the transition portion, the maximum thickness of the transition portion is less than the minimum thickness of the edge portion; or the thickness of the center portion, the thickness of the transition portion and the thickness of the edge portion are equal.

[0017] In this way, by setting the maximum thickness of the center portion to be less than the minimum thickness of the edge portion, not only does the center portion of the support structure have a certain supporting ability, but also the center region of the thermal insulation has a larger deformable space, so that the deformability of the center region of the thermal insulation is greater than the deformability of the edge region. By setting the maximum thickness of the center portion to be less than the minimum thickness of the transition portion, and the maximum thickness of the transition portion to be less than the minimum thickness of the edge portion, the deformability of the transition region is less than the deformability of the center region and greater than the deformability of the edge region, so that the transition region can receive the stress transmitted from the center region and further transmit the stress to the edge region more gently, which is beneficial to improve the stability and reliability of the thermal insulation. By setting the thickness of the center portion, the thickness of the transition portion and the thickness of the edge portion to be equal, not only can the center region, the transition region and the edge region of the thermal insulation have a certain structural strength, but also it is beneficial to manufacture the support structure.

[0018] In some embodiments, the cross-sectional shape of the through hole in the center region comprises at least a hexagon in a cross section perpendicular to the thickness direction of the support structure; and / or the cross-sectional shape of the through hole in the edge region comprises at least a hexagon in a cross section perpendicular to the thickness direction of the support structure; and / or the cross-sectional shape of the through hole in the transition region comprises at least a hexagon in a cross section perpendicular to the thickness direction of the support structure.

[0019] In this way, by setting the cross-sectional shape of the through hole in the center region to at least include a hexagon, the structural strength of the center region of the thermal insulation piece is further improved. By setting the cross-sectional shape of the through hole in the edge region to at least include a hexagon, the structural strength of the edge region of the thermal insulation piece is further improved. By setting the cross-sectional shape of the through hole in the transition region to at least include a hexagon, the structural strength of the transition region of the thermal insulation piece is further improved.

[0020] In some embodiments, the cross-sectional shape of the through hole in the center region is a regular hexagon in a cross section perpendicular to the thickness direction of the support structure, and the cross-sectional shape of the through hole in the transition region is a hexagon in a cross section perpendicular to the thickness direction of the support structure; and / or the cross-sectional shape of the through hole in the edge region comprises a regular hexagon and a parallelogram in a cross section perpendicular to the thickness direction of the support structure.

[0021] In this way, by setting the cross-sectional shape of the through hole in the center region to a regular hexagon and the cross-sectional shape of the through hole in the transition region to a hexagon, on the one hand, since the structure of a regular hexagon has good symmetry and stability, not only can it make the stress more evenly dispersed at the center region, but also it is beneficial to make the center region have a certain structural strength; on the other hand, since the structure of a hexagon has a certain stability, it makes the transition region have a certain structural strength, which is conducive to the transition region to buffer the stress transmitted from the center region in a more stable state. By setting the cross-sectional shape of the through hole in the edge region to include a regular hexagon and a parallelogram, not only can the structural stability of the edge region be improved by utilizing the structural characteristics of a regular hexagon, and the ability of the edge region to absorb and relieve stress can be improved by utilizing the structural characteristics of a parallelogram having a certain deformation ability, but also the part of the support structure located in the edge region can be easier to manufacture by virtue of the combination of a regular hexagon and a parallelogram.

[0022] In some embodiments, the cross section of the through hole in the center region has a plurality of first sides, and the cross section of the through hole in the edge region has a plurality of second sides; the minimum length of the first side is greater than the maximum length of the second side.

[0023] In this way, not only is it convenient to set the cross-sectional area of the through hole in the center region to be larger, but it is also beneficial to improve the structural support strength of the edge region.

[0024] In some embodiments, the thermal insulation further comprises a transition region; the transition region is disposed around the central region; the edge region is disposed around the transition region; in a cross section perpendicular to the thickness direction of the support structure, a cross section of the through hole located in the transition region has a plurality of third sides, the lengths of the third sides have at least two size specifications; the minimum length of the third side is smaller than the minimum length of the first side and greater than or equal to the maximum length of the second side; the maximum length of the third side is smaller than or equal to the minimum length of the first side.

[0025] In this way, by controlling the side length of the cross section of the through hole located in the transition region and making the side length have at least two size specifications, not only is it beneficial to more flexibly form the through hole on the transition region, but also is beneficial to the transition region connecting between the central region and the edge region, facilitating the manufacture of the through hole formed on different regions.

[0026] In some embodiments, the lengths of the third sides have two size specifications, all the third sides include first specification sides and second specification sides; the length of the first specification side is equal to the length of the first side adjacent to the first specification side; the first specification side and the first side adjacent to the first specification side are defined by the boundaries of the cross sections of two adjacent through holes; the cross sections of the two adjacent through holes are both perpendicular to the thickness direction of the support structure; the length of the second specification side is smaller than the length of the first specification side.

[0027] In this way, by setting the lengths of the third sides to have two size specifications and controlling the sizes of the two size specifications, it is suitable for the transition region to connect between the central region and the edge region, not only making the support structure have certain support performance, but also facilitating the forming of the support structure.

[0028] In some embodiments, the length of the first side is greater than 50 mm and smaller than or equal to 100 mm; the length of the second side is greater than or equal to 20 mm and smaller than or equal to 50 mm.

[0029] In this way, by controlling the side length of the first side, not only is it beneficial to make the through hole located in the central region larger, so that the stress can be transmitted and dispersed in a larger area, but also makes the central region have certain structural strength. By controlling the side length of the second side, not only is it beneficial to improve the structural strength of the edge region, but also makes the through hole located in the edge region also have certain stress dispersion capability. In this way, the central region and the edge region of the thermal insulation can cooperate with each other, so that the overall structure has certain stress dispersion capability while having certain structural strength.

[0030] In some embodiments, the support structure comprises a plurality of support walls, all the support walls are connected in a preset manner and define all the through holes.

[0031] Therefore, by arranging the support walls, the support structure is substantially formed as a frame structure, which not only helps to improve the support performance and structural strength of the support structure, but also helps to flexibly adjust the structural performance and function by changing the length, thickness, connection mode, etc. of the support walls, thereby facilitating the manufacturing of the support structure.

[0032] In some embodiments, the thicknesses of all the support walls are the same; and / or, the thickness of the support wall is 10 µm to 180 µm; wherein the thickness direction of the support wall and the thickness direction of the support structure are perpendicular to each other.

[0033] Therefore, by arranging the thicknesses of all the support walls to be the same, the reliability of the structure is improved and the manufacturing is facilitated. By controlling the thickness of the support wall, the support wall has a certain structural stability while reducing the space occupied by the support wall, thereby facilitating the arrangement of more thermal insulation materials.

[0034] In some embodiments, one through hole is arranged in the central region; the area surrounded by the hole wall of the through hole in the central region is overlapped with the normal projection of the central region on the reference plane; and the reference plane is a plane perpendicular to the thickness direction of the support structure.

[0035] Therefore, by arranging one through hole in the central region, not only the part of the support structure in the central region is facilitated to be manufactured, but also the deformability of the central region is further improved.

[0036] In some embodiments, the thickness of the support structure is 0.2 mm to 3 mm; and / or, the material of the support structure comprises at least one of polyester aluminum, silica gel, aluminum, polyurethane, polystyrene, and fiber reinforced plastic.

[0037] Therefore, by controlling the thickness of the support structure, not only the support structure has a certain support performance and is facilitated to be manufactured, but also the space occupied by the support structure is reduced, thereby facilitating the reduction of the space occupied by the thermal insulation member in the battery device. By controlling the material of the support structure, the support structure has a certain mechanical performance and a certain physical performance, and also has processability and cost-effectiveness.

[0038] In some embodiments, the accommodation cavity has a first cavity wall and a second cavity wall arranged opposite and spaced apart along the thickness direction of the support structure, and a third cavity wall connecting the first cavity wall and the second cavity wall; wherein at least part of the side of the support structure facing the first cavity wall is connected or abuts the first cavity wall; and / or, at least part of the side of the support structure facing the second cavity wall is connected or abuts the second cavity wall; and / or, at least part of the side of the support structure facing the third cavity wall is connected or abuts the third cavity wall.

[0039] In this way, by controlling the relationship between the support structure and the cavity wall in different directions of the accommodation cavity, a structure with different structural strengths can be formed. In the case where at least part of the support structure is connected or abuts against the cavity wall of the accommodation cavity, the deformation of the thermal insulation piece can be further inhibited. In the case where part of the support structure is not connected or abuts against the cavity wall of the accommodation cavity, the space for accommodating the thermal insulation material can be increased, so that the heat insulation effect of the thermal insulation piece can be further improved.

[0040] In some embodiments, the packaging layer comprises two thermal insulation layers; the two thermal insulation layers are respectively arranged on two sides in the thickness direction of the support structure, and the edges of the two thermal insulation layers are connected to each other and define the accommodation cavity.

[0041] In this way, by arranging the packaging layer in the form of two thermal insulation layers, in the process of heat transfer, heat needs to pass through the two thermal insulation layers in turn. Since each thermal insulation layer hinders the transfer of heat, the heat transfer path is lengthened and the transfer resistance is increased. At the same time, it is convenient to form the accommodation cavity, thereby facilitating the manufacture of the thermal insulation piece.

[0042] In some embodiments, the material of the thermal insulation layer comprises at least one of polyethylene terephthalate, polyimide, polytetrafluoroethylene, and polyether ether ketone.

[0043] In this way, by controlling the material of the thermal insulation layer, the thermal insulation layer has certain heat insulation performance, thermal stability, chemical stability, and mechanical properties, thereby facilitating the improvement of the heat insulation performance, reliability, and stability of the thermal insulation piece.

[0044] In some embodiments, in the thickness direction of the support structure, the thickness of the thermal insulation layer is greater than or equal to 6 µm; the thickness direction of the support structure is parallel to the arrangement direction of the adjacent two battery cells.

[0045] In this way, by controlling the material of the thermal insulation layer, the space occupied by the thermal insulation piece is further reduced while facilitating the manufacture of the thermal insulation layer and enabling the thermal insulation layer to have certain heat insulation performance.

[0046] In some embodiments, the edges of the two thermal insulation layers are connected by a preset mode; the preset mode comprises at least one of a heat sealing process and an ultrasonic welding process.

[0047] In this way, by using the heat sealing process and / or the ultrasonic welding process to connect the two thermal insulation layers, the packaging layer has certain sealing effect, and the edges of the two thermal insulation layers have certain connection strength, and the processing and manufacturing are facilitated.

[0048] In some embodiments, the thermal insulation material comprises thermal insulation particles.

[0049] Thus, by setting the thermal insulation material to include thermal insulation particles, due to the characteristics of the thermal insulation particles generally having a low thermal conductivity coefficient, a large number of tiny thermal insulation units can be formed inside the material. When heat is transmitted through the thermal insulation material containing thermal insulation particles, the heat needs to constantly conduct, scatter, and other complex processes among these thermal insulation particles, greatly increasing the path length and difficulty of heat transmission, thereby effectively hindering the conduction of heat and significantly improving the thermal insulation effect of the thermal insulation part. At the same time, by distributing the thermal insulation material in the thermal insulation material, the external force can be resisted to some extent, and the stress on the material is shared, so that the thermal insulation material containing thermal insulation particles has better toughness and anti-deformation ability under the impact of external force, extrusion, and other conditions.

[0050] In some embodiments, the material of the thermal insulation particles includes at least one of alumina micro-nano material, silicon oxide micro-nano material, and silicon nitride micro-nano material; and / or, the density of the thermal insulation particles is 0.5 g / cm³ to 3.0 g / cm³; and / or, the compressibility of the thermal insulation particles under a pressure of 2Mpa is 30% to 60%; and / or, the mass fraction of the thermal insulation particles in the thermal insulation material is greater than or equal to 50%.

[0051] Thus, by controlling the material of the thermal insulation particles, not only does the thermal insulation particles have certain thermal resistance, high temperature resistance, chemical stability, and certain material strength, but also facilitates processing and molding. By controlling the density of the thermal insulation particles, not only can the thermal insulation particles have certain thermal insulation effect, but also the strength and toughness of the thermal insulation particles can be adjusted, thereby improving the thermal insulation performance and reliability of the thermal insulation part. By controlling the compressibility of the thermal insulation particles, the thermal insulation material can be deformed to absorb stress and reduce damage to the shell or other structures.

[0052] In some embodiments, the center region is substantially orthogonal to the corresponding battery monomer; and / or, the thermal insulation part is orthogonal to the large face of the battery monomer adjacent to the thermal insulation part; and / or, the area of the center region is 0.1 to 0.5 times the area of the large face of the corresponding battery monomer.

[0053] Thus, by setting the center region to be substantially orthogonal to the large face of the battery monomer, the expansion force of the battery monomer can be further effectively absorbed. By covering the thermal insulation pad on the large face of the battery monomer, the large faces of two adjacent battery monomers can be blocked, thereby facilitating the improvement of the thermal insulation effect and further improving the ability to slow down the thermal runaway of the battery device. By controlling the size of the center region based on the size of the large face of the battery monomer, the buffering performance of the thermal insulation part to the expansion force of the battery monomer can be further improved.

[0054] In a second aspect, the present application provides a power consuming device comprising the battery device in any of the above embodiments.

[0055] The power consuming device also has the advantages of the battery device in any of the above embodiments, which will not be repeated here.

[0056] In a third aspect, the present application provides a thermal insulation member for a battery device, the battery device comprising a plurality of battery cells, the thermal insulation member being arranged between large faces of at least two adjacent battery cells; the thermal insulation member comprising a central region and an edge region arranged around the central region, the central region covering a center of the large face in an orthogonal projection on the large face of the corresponding battery cell, the deformability of the central region being greater than that of the edge region.

[0057] The thermal insulation member also has the advantages of the battery device in any of the above embodiments, which will not be repeated here.

[0058] The above description is only a summary of the technical solutions of the present application. In order to enable one of ordinary skill in the art to better understand the technical means of the present application and implement it according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0059] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The accompanying drawings are included to provide a description of the embodiments and are not meant to limit the present application. Moreover, the same reference numerals in different drawings represent the same or similar elements. In the drawings:

[0060] Figure 1 Structure diagram of a vehicle in some embodiments of the present application;

[0061] Figure 2 Exploded structure diagram of a battery device in some embodiments of the present application;

[0062] Figure 3 Exploded structure diagram of a battery cell in some embodiments of the present application;

[0063] Figure 4 Structure diagram of a battery cell and a thermal insulation member cooperating in some embodiments of the present application;

[0064] Figure 5 Structure diagram of a thermal insulation member in some embodiments of the present application;

[0065] Figure 6 Internal structure diagram of a thermal insulation member in some embodiments of the present application;

[0066] Figure 7 Structure diagram of a support structure in some embodiments of the present application;

[0067] Figure 8 Structure diagram of a support structure in some embodiments of the present application; Figure 6 Structure diagram of a cross section in the A-A direction in some embodiments of the present application;

[0068] Figure 9 Structure diagram of a support structure in some embodiments of the present application; Figure 8 Structure diagram of a partial enlargement at B in some embodiments of the present application;

[0069] Figure 10 Structure diagram of a cross section of a support structure in cooperation with a packaging layer in some embodiments of the present application;

[0070] Figure 11 Structure diagram of each region of an insulating member in some embodiments of the present application;

[0071] Figure 12 Structure diagram of a cross section of a portion of a support structure in a central region in some embodiments of the present application;

[0072] Figure 13 Structure diagram of a cross section of a portion of a support structure in an edge region in some embodiments of the present application;

[0073] Figure 14 Structure diagram of a cross section of a portion of a support structure in a transition region in some embodiments of the present application.

[0074] Explanation of reference numerals:

[0075] Vehicle 1;

[0076] Battery device 10, controller 20, motor 30;

[0077] Battery cell 100, case 110, large face m, end cap 120, electrode terminal et, electrode assembly 130;

[0078] Box 200, first portion 210, second portion 220;

[0079] Insulating member 300, central region z1, edge region z2, transition region z3, packaging layer 310, insulating layer 311, main portion 311a, connecting portion 311b, accommodation cavity Q, first cavity wall b1, second cavity wall b2, third cavity wall b3, support structure 320, central portion 321, edge portion 322, transition portion 323, through hole k, first edge u1, second edge u2, third edge u3, insulator 330, support wall g, first specification wall ga, second specification wall gb;

[0080] The first thickness h1, the second thickness h2, the third thickness h3, the fourth thickness h4, the first length d1, the second length d2, the third length d3, the fourth length d4.

[0081] The first direction F1, the second direction F2, the third direction F3. DETAILED DESCRIPTION

[0082] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used in the specification and claims and the aforementioned drawings, are intended to cover a non-exclusive inclusion.

[0084] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0085] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0086] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0087] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0088] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0089] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix", and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0090] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0091] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery device mentioned in the present application can include a battery module or a battery pack, etc.

[0092] The battery device can include a box for packaging one or more battery monomers. The battery device can also not include a box. For example, a plurality of battery monomers can be placed in the box after being connected in series, parallel or mixed. For another example, a plurality of battery monomers can be placed in the box after being connected in series, parallel or mixed to obtain a battery module. When one of the battery monomers is in thermal runaway, the heat will continue to conduct from one battery monomer to the adjacent battery monomer, thereby causing thermal diffusion of the entire battery device and causing damage to the entire battery device.

[0093] Based on this, in order to slow down the thermal runaway of the battery device, the embodiment of the present application provides a battery device, which slows down the thermal runaway of the battery device by configuring a thermal insulation member. Specifically, by setting the thermal insulation member and improving the structure of the thermal insulation member, different degrees of buffering performance and supporting performance are provided, and the heat insulation performance of the thermal insulation member is improved, so that the ability of the thermal insulation member to slow down the thermal runaway of the battery device is further improved.

[0094] The battery disclosed in the embodiment of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the battery disclosed in the present application and other components, so that the thermal runaway of the battery device is slowed down.

[0095] The embodiment of the present application provides an electric device using a battery device as a power supply. The electric device is a device that uses electric energy as energy and realizes corresponding functions by consuming electric energy. For example, the electric 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 car, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric aircraft toys, etc. The spacecraft can include aircraft, rockets, space shuttles and spacecraft, etc.

[0096] The electric device of the embodiment of the present application can include a device body and a power supply device. The power supply device is used to supply power to the device body, and can include a battery monomer or a battery pack. The device body refers to the main structure that consumes electric energy to realize corresponding functions. For example, the electric device can be a mobile phone, and the device body is the part that can realize communication functions, etc., and the part that can realize communication functions, etc. is powered by the battery monomer or the battery pack. For example, the electric device can be a car, and the device body is the part that can provide people with seats and can drive on the road, and the part that can provide people with seats and can drive on the road is powered by the battery monomer or the battery pack. The power supply device refers to a device that can output electric energy. For example, the battery pack composed of the battery monomer can output electric energy.

[0097] The following embodiments are described for convenience with a vehicle as an example of an electric device of an embodiment of the present application.

[0098] Please refer to Figure 1 , Figure 1A schematic diagram of a vehicle 1 in some embodiments of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1 is internally provided with a battery device 10, which can be arranged at the bottom, head or tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1, for example, the battery device 10 can be used as the operating power supply of the vehicle 1. The vehicle 1 can also include a controller 20 and a motor 30, the controller 20 is used to control the battery device 10 to supply power to the motor 30, for example, for the power demand of the vehicle 1 during starting, navigation and driving.

[0099] In some embodiments of the present application, the battery device 10 can not only be used as the operating power supply of the vehicle 1, but also be used as the driving power supply of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0100] In order to meet different power demand, the battery device 10 can include a plurality of battery monomers 100, which is the smallest unit of a battery module or a battery pack. The plurality of battery monomers 100 can be connected in series and / or parallel via electrode terminals et to be applied to various application occasions. The battery mentioned in the present application includes a battery module or a battery pack. Among them, the plurality of battery monomers 100 can be connected in series or parallel or mixed connection, and the mixed connection means the mixture of series connection and parallel connection. The battery device 10 can also be called a battery pack. In the embodiments of the present application, the plurality of battery monomers 100 can directly constitute a battery pack, or first constitute a battery module, and then the battery module constitutes a battery pack.

[0101] Please refer to Figure 2 , Figure 2 A schematic diagram of the battery device 10 in some embodiments of the present application. Figure 2 Among them, the battery device 10 can include a plurality of battery modules and a box body 200, and the plurality of battery modules are contained in the box body 200. The box body 200 is used to contain the battery monomers 100 to avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomers 100. The box body 200 can be a simple solid structure such as a cuboid or a cylinder or a sphere, or a complex solid structure composed of a cuboid or a cylinder or a sphere, which is not limited in the embodiments of the present application. The material of the box body 200 can be an alloy material such as aluminum alloy or iron alloy, or a high polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, which is not limited in the embodiments of the present application.

[0102] In some embodiments, the box 200 can include a first part 210 and a second part 220, the first part 210 and the second part 220 are mutually coverable, and the first part 210 and the second part 220 jointly define a space for accommodating the battery monomer 100. The second part 220 can be a hollow structure with one end open, and the first part 210 can be a plate-shaped structure, the first part 210 covers the open side of the second part 220, so that the first part 210 and the second part 220 jointly define a space for accommodating the battery monomer 100. The first part 210 and the second part 220 can also be hollow structures with one side open, and the open side of the first part 210 covers the open side of the second part 220.

[0103] The battery module can include a plurality of battery monomers 100, which can be connected in series or parallel or mixed connection to form a battery module, and a plurality of battery modules are connected in series or parallel or mixed connection to form a battery. In this application, the battery monomer 100 can include lithium ion battery, sodium ion battery or magnesium ion battery device, etc., and the embodiments of the present application are not limited thereto. The battery monomer 100 can be a cylinder, a flat body, a cuboid or other shapes, etc., and the embodiments of the present application are not limited thereto. The battery monomer 100 can be a cylinder, a flat body, a cuboid or other shapes, etc., and the embodiments of the present application are not limited thereto. For the sake of simplicity, the following embodiments are described with the square battery monomer 100 as an example.

[0104] Please refer to Figure 3 , Figure 3 is a schematic diagram of the exploded structure of the battery monomer 100 in some embodiments of the present application. The battery monomer 100 refers to the smallest unit that constitutes the battery device 10. As Figure 4 , the battery monomer 100 includes a shell 110, an end cover 120, an electrode assembly 130 and other functional components.

[0105] The shell 110 is a component for cooperating with the end cover 120 to form an internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 130, electrolyte (not shown in the figure) and other components. The shell 110 and the end cover 120 can be independent components, and an opening can be provided on the shell 110, and the end cover 120 is made to cover the opening to form the internal environment of the battery cell 100. Without limitation, the end cover 120 and the shell 110 can also be integrated, specifically, the end cover 120 and the shell 110 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 110, the end cover 120 is made to cover the shell 110. The shell 110 can be various shapes and various sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 110 can be determined according to the specific shape and size of the electrode assembly 130. The material of the shell 110 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations on this. The opening of the shell 110 can be located on the side or bottom of the shell 110, and the embodiments of the present application do not make limitations on this.

[0106] The end cover 120 refers to a component that can be coupled to the opening of the shell 110 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cover 120 can be adapted to the shape of the shell 110 to fit the shell 110. Optionally, the end cover 120 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 120 is less likely to deform when subjected to a pressing impact, and the battery cell 100 can have higher structural strength and improved safety performance. The end cover 120 can be provided with functional components such as electrode terminals et. The electrode terminals et can be used to electrically connect with the electrode assembly 130 for outputting or inputting the electric energy of the battery cell 100. In some embodiments, the end cover 120 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 100 when the internal pressure or temperature of the battery cell 100 reaches a threshold value. In some embodiments, the end cover 120 can also be provided with a liquid injection hole for injecting electrolyte into the interior of the battery cell 100. The material of the end cover 120 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating member can also be provided on the inner side of the end cover 120, which can be used to isolate the electrically connected components in the shell 110 from the end cover 120 to reduce the risk of short circuit. For example, the material of the insulating member can be plastic, rubber, etc. In some embodiments, the shell 110 and / or the end cover 120 can also be provided with a pressure relief mechanism. The pressure relief mechanism is used to relieve the internal pressure of the battery cell 100 when the internal pressure or temperature of the battery cell 100 reaches a threshold value, to improve the safety performance of the battery cell 100. The threshold value is different according to different design requirements. The threshold value can depend on the material of one or more of the electrode assembly 130 and the separator in the battery cell 100. The pressure relief mechanism can take the form of a relief valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature of the battery cell 100 reaches the threshold value, the pressure relief mechanism performs an action or the weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or passage for the internal pressure or temperature to be relieved.

[0107] The electrode assembly 130 is a component in which electrochemical reactions occur in the battery cell 100. One or more electrode assemblies 130 can be contained within the case 110. The electrode assembly 130 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and an insulator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 130, and portions without active materials that each constitute a tab (not shown in the drawings). The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body, and can be located at the top of the main body or at the side wall of the main body, without being particularly limited. During charging and discharging of the battery device 10, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminal et to form a current loop. The insulator is used to separate the positive electrode sheet and the negative electrode sheet, and to prevent electrons within the battery cell 100 from freely passing through, allowing ions in the electrolyte to freely flow between the positive electrode sheet and the negative electrode sheet. The insulator can be a thin film made of a material such as PE (polyethylene), PP (polypropylene), or the like.

[0108] According to some embodiments of the present application, please continue to refer to Figure 3 , and in combination with referring to Figure 4 and Figure 5 , Figure 4 is a structural schematic view of the battery cell 100 and the heat insulation member 300 cooperating in some embodiments of the present application, Figure 5 is a structural schematic view of the heat insulation member 300 in some embodiments of the present application. The present application provides a battery device 10 including a plurality of battery cells 100 and a heat insulation member 300. The heat insulation member 300 is arranged between large faces m of at least two adjacent battery cells 100. The heat insulation member 300 includes a central region z1 and an edge region z2 arranged around the central region z1, the central region z1 covers the center of the corresponding large face m in the orthogonal projection on the large face m of the corresponding battery cell 100, and the deformability of the central region z1 is greater than that of the edge region z2.

[0109] The heat insulation member 300 is a component with certain heat insulation capability. It can be arranged between any two adjacent large faces m of the battery cells 100, or it can be arranged between some adjacent large faces m of the battery cells 100, without being particularly limited. The central region z1 of the heat insulation member 300 generally corresponds to the large face m of the battery cell 100. In Figure 5 , the position of the central region z1 is schematically shown by a dashed line box. The large face m of the battery cell 100 is the face on the wall with the largest area on the case 110. It should be noted that the shape and size of the central region z1 can be determined according to specific conditions, without being particularly limited.

[0110] The deformable ability refers to the characteristic that the object can change shape when subjected to external force. The greater the deformable ability of the object, the weaker the supporting performance of the object. That is, the supporting performance of the edge area z2 is greater than that of the center area z1, so that the thermal insulation piece 300 has a certain structural strength. If the battery monomer 100 expands to a certain extent, the expansion force of the center part of the large face m of the battery monomer 100 is greater, and the center area z1 of the thermal insulation piece 300 can produce a certain deformation to buffer the influence of the expansion force of the battery monomer 100. In this way, by configuring the center area z1 and the edge area z2 of the thermal insulation piece 300 to have different deformable abilities, the thermal insulation piece 300 not only has a certain supporting performance, but also has a certain deformable ability.

[0111] Therefore, by arranging the thermal insulation piece 300 between the large faces m of the two adjacent battery monomers 100, the thermal runaway of the battery device 10 can be reduced and delayed. Since the deformable ability of the center area z1 of the thermal insulation piece 300 is greater than that of the edge area z2 of the thermal insulation piece 300, not only can the large face m of the corresponding battery monomer 100 be partitioned and buffered and supported to different degrees when subjected to the relevant force, the stress concentration situation is improved, and the corresponding battery monomer 100 is protected, thereby improving the reliability of the battery monomer 100, but also the large face m of the corresponding battery monomer 100 can be kept in a relatively good state of adhesion, thereby improving the situation that heat forms a new heat conduction path through the gap between the battery monomer 100 and the thermal insulation piece 300, which is conducive to improving the heat insulation effect of the thermal insulation piece 300, thereby delaying the thermal runaway of the battery.

[0112] According to some embodiments of the present application, please continue to refer to Figure 5 , and in combination with referring to Figure 6 and Figure 7 , Figure 6 is a schematic view of the internal structure of the thermal insulation piece 300 in some embodiments of the present application, Figure 7 is a schematic view of the support structure 320 in some embodiments of the present application, wherein Figure 6 in the figure, the support structure 320 accommodated in the accommodation cavity Q is schematically shown by a dashed line. The thermal insulation piece 300 includes a packaging layer 310, a support structure 320, and a thermal insulation object 330. The packaging layer 310 has an accommodation cavity Q, the support structure 320 is arranged in the accommodation cavity Q, and the thermal insulation object 330 is arranged in the space defined by the support structure 320 and the inner wall of the accommodation cavity Q.

[0113] The packaging layer 310 is a component for forming the internal environment of the thermal insulation piece 300. The packaging layer 310 provides the accommodation cavity Q for accommodating the remaining parts in the thermal insulation piece 300. The opposite sides of the packaging layer 310 are respectively in contact with the large face m of the corresponding battery monomer 100.

[0114] The support structure 320 is a component with certain support performance. The support structure 320 is arranged in the accommodation cavity Q, and can enhance the structural strength of the thermal insulation piece 300. The space defined by the support structure 320 and the inner wall of the accommodation cavity Q includes the space in the accommodation cavity Q that is not occupied by the support structure 320. In the case where the space in the support structure 320 is in communication with the accommodation cavity Q, the space defined by the support structure 320 and the inner wall of the accommodation cavity Q also includes the space in the support structure 320. It can be understood that the space in the support structure 320 is the space defined by the support structure 320 itself.

[0115] The thermal insulation 330 is a component with certain thermal insulation performance. The thermal insulation 330 can be in the form of particles, or in the form of a sheet, or in other forms, which are not specifically limited herein. The thermal insulation 330 is arranged in the space defined by the support structure 320 and the inner wall of the accommodation cavity Q. For example, the thermal insulation 330 can be arranged in the space in the accommodation cavity Q that is not occupied by the support structure 320. For another example, the thermal insulation 330 can be arranged in the space in the support structure 320. For yet another example, the thermal insulation 330 can be arranged anywhere in the space defined by the support structure 320 and the inner wall of the accommodation cavity Q. The specific arrangement of the thermal insulation 330 is not specifically limited herein.

[0116] In this way, by arranging the support structure 320 in the thermal insulation piece 300, not only can the thermal insulation piece 300 have certain thermal insulation performance and certain structural strength, thereby improving the reliability of the thermal insulation piece 300, but also the stress acting on the thermal insulation piece 300 can be dispersed by means of the support structure 320.

[0117] It should be noted that the deformability of the thermal insulation piece 300 in different regions can be controlled by controlling the deformability of the packaging layer 310 in different regions of the thermal insulation piece 300, such as the material, thickness, and structure of different parts of the packaging layer 310. The deformability of the thermal insulation piece 300 in different regions can also be controlled by controlling the deformability of the thermal insulation 330 in different regions of the thermal insulation piece 300, such as the material, density, and structure of the thermal insulation 330 in different regions. The deformability of the thermal insulation piece 300 in different regions can also be controlled by controlling the deformability of the support structure 320 in different regions of the thermal insulation piece 300, such as the material, thickness, and structure of different parts of the support structure 320.

[0118] According to some embodiments of the present application, please continue to refer to Figure 7 The support structure 320 is provided with a plurality of through holes k arranged in the thickness direction of the support structure 320, and at least part of the thermal insulation 330 is accommodated in the plurality of through holes k. In a cross section perpendicular to the thickness direction of the support structure 320, the minimum cross-sectional area of the through hole k located in the central region z1 is greater than the maximum cross-sectional area of the through hole k located in the edge region z2. The thickness direction of the support structure 320 is parallel to the arrangement direction of the adjacent two battery monomers 100.

[0119] For example, with reference to Figure 4 , the first direction F1 is the length direction of the battery monomer 100, the second direction F2 is the width direction of the battery monomer 100, and the third direction F3 is the height direction of the battery monomer 100. The first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other, but are not limited thereto. The arrangement direction of the two adjacent battery monomers 100 is the second direction F2. That is, the thickness direction of the support structure 320 is parallel to the second direction F2. The cross section perpendicular to the thickness direction of the support structure 320 is parallel to the first direction F1 and the third direction F3.

[0120] The through hole k can be a constant-diameter hole with a constant aperture along the first direction F1, or a variable-diameter hole with a variable aperture along the first direction F1. For example, Figure 7 , a case where all the through holes k are constant-diameter holes is shown. The apertures of the through holes k in the same region can be the same, can not be completely the same, or can be different from each other. As long as the minimum cross-sectional area of the through hole k located in the central region z1 is greater than the maximum cross-sectional area of the through hole k located in the edge region z2, no specific limitation is made herein.

[0121] In this way, by providing the through hole k, it is not only beneficial to the manufacture of the support structure 320, but also beneficial to improve the utilization rate of the accommodation cavity Q. Since the cross-sectional area of the through hole k located in the central region z1 is greater than the cross-sectional area of the through hole k located in the edge region z2, the support capacity of the support structure 320 located in the edge region z2 is greater than the support capacity of the support structure 320 located in the central region z1, and the deformability of the support structure 320 located in the central region z1 is greater than the deformability of the support structure 320 located in the edge region z2. In this way, not only does the central region z1 of the heat insulation piece 300 have greater deformability than the edge region z2, thereby facilitating the buffering and supporting of the large face m of the battery monomer 100, but also facilitates accommodating more heat insulation objects 330 in the central region z1 of the heat insulation piece 300, further improving the heat insulation effect of the central region z1 of the heat insulation piece 300.

[0122] According to some embodiments of the present application, please continue to refer to Figure 6 and Figure 7 , and refer to Figures 8 to 10 , Figure 8 is a cross-sectional structure schematic view in the A-A direction of Figure 6 , Figure 9 is a local enlarged structure schematic view at B in Figure 8 , Figure 10 is a cross-sectional structure schematic view of the support structure 320 cooperating with the packaging layer 310 in another embodiment of the present application, wherein Figure 9 and Figure 10The thermal insulation 330 is not shown in the center. The support structure 320 includes a central portion 321 located in the central region z1, and an edge portion 322 located in the edge region z2. Among them, the maximum thickness of the central portion 321 is less than the minimum thickness of the edge portion 322; or, the thickness of the central portion 321 is equal to the thickness of the edge portion 322.

[0123] Specifically, the thickness of the central portion 321 is the size of the central portion 321 along the second direction F2, and the thickness of the edge portion 322 is the size of the edge portion 322 along the second direction F2. For example, the thickness of the central portion 321 is equal to the thickness of the edge portion 322. Figure 9 For example, the thickness of the central portion 321 is less than the thickness of the edge portion 322. The central portion 321 can be an equal-thickness component or an unequal-thickness component. The edge portion 322 can be an equal-thickness component or an unequal-thickness component. Figure 10 For example, the thickness of the central portion 321 is less than the thickness of the edge portion 322. The central portion 321 can be an equal-thickness component or an unequal-thickness component. The edge portion 322 can be an equal-thickness component or an unequal-thickness component.

[0124] In this way, by setting the maximum thickness of the central portion 321 of the support structure 320 to be less than the minimum thickness of the edge portion 322, not only does the central portion 321 of the support structure 320 have a certain supporting ability, but also the central region z1 of the thermal insulation 300 has a larger deformable space, so that the deformable ability of the central region z1 of the thermal insulation 300 is greater than that of the edge region z2. By setting the thickness of the central portion 321 of the support structure 320 to be equal to the thickness of the edge portion 322, not only can the central region z1 and the edge region z2 of the thermal insulation 300 both have a certain structural strength, but also it is beneficial to the manufacture of the support structure 320.

[0125] According to some embodiments of the present application, please continue to refer to Figure 7 On the cross section perpendicular to the thickness direction of the support structure 320, the cross-sectional shape of the through hole k located in the central region z1 at least includes a hexagon; and / or, on the cross section perpendicular to the thickness direction of the support structure 320, the cross-sectional shape of the through hole k located in the edge region z2 at least includes a hexagon.

[0126] For example, the cross-sectional shape of the through hole k located in the central region z1 can also include a circular shape, a rectangular shape, a triangular shape, a trapezoidal shape, and other shapes. The cross-sectional shape of the through hole k located in the edge region z2 can also include a circular shape, a rectangular shape, a triangular shape, a trapezoidal shape, and other shapes. Herein, no specific limitation is made. Of course, the cross-sectional shape of the through hole k can also include an irregular shape, which is not specifically limited herein.

[0127] In this way, by setting the cross-sectional shape of the through hole k located in the central region z1 to at least include a hexagon, the structural strength of the central region z1 of the thermal insulation piece 300 is further improved. By setting the cross-sectional shape of the through hole k located in the edge region z2 to at least include a hexagon, the structural strength of the edge region z2 of the thermal insulation piece 300 is further improved. The cross-sectional shape of the through hole k at different regions of the thermal insulation piece 300 all includes a hexagon, so that each region of the thermal insulation piece 300 has a certain structural strength.

[0128] According to some embodiments of the present application, please continue to refer to Figure 7 , and in combination with referring to Figure 11 , Figure 11 The structural schematic diagram of each region of the thermal insulation piece 300 in some embodiments of the present application is shown in FIG. 3B. The thermal insulation piece 300 further includes a transition region z3. The transition region z3 is arranged around the central region z1, and the edge region z2 is arranged around the transition region z3. In the cross section perpendicular to the thickness direction of the support structure 320, the minimum cross-sectional area of the through hole k located in the central region z1 is greater than the maximum cross-sectional area of the through hole k located in the transition region z3; the minimum cross-sectional area of the through hole k located in the transition region z3 is greater than the maximum cross-sectional area of the through hole k located in the edge region z2.

[0129] In this way, by setting the transition region z3 between the central region z1 and the edge region z2, and setting the cross-sectional area of the through hole k located in the transition region z3 to be between the cross-sectional area of the through hole k located in the central region z1 and the cross-sectional area of the through hole k located in the edge region z2, the deformability of the transition region z3 is less than that of the central region z1 and greater than that of the edge region z2, so that the transition region z3 can receive the stress transmitted from the central region z1 and further transmit the stress to the edge region z2 more gently, thereby improving the stability and reliability of the thermal insulation piece 300.

[0130] According to some embodiments of the present application, please continue to refer to Figure 7 and Figure 8 , the support structure 320 includes a central portion 321 located in the central region z1, a transition portion 323 located in the transition region z3, and an edge portion 322 located in the edge region z2. Among them, the maximum thickness of the central portion 321 is less than the minimum thickness of the edge portion 322; or, the maximum thickness of the central portion 321 is less than the minimum thickness of the transition portion 323, and the maximum thickness of the transition portion 323 is less than the minimum thickness of the edge portion 322; or, the thickness of the central portion 321, the thickness of the transition portion 323 and the thickness of the edge portion 322 are equal.

[0131] For example, Figure 8For example, the thickness of the center portion 321, the thickness of the transition portion 323 and the thickness of the edge portion 322 are equal. The thickness of the center portion 321 is a first thickness h1, the thickness of the transition portion 323 is a second thickness h2, and the thickness of the edge portion 322 is a third thickness h3. The first thickness h1, the second thickness h2 and the third thickness h3 are equal.

[0132] In this way, by setting the maximum thickness of the center portion 321 to be less than the minimum thickness of the edge portion 322, not only does the center portion 321 of the support structure 320 have a certain supporting capacity, but the center region z1 of the thermal insulation piece 300 also has a larger deformable space, so that the deformable capacity of the center region z1 of the thermal insulation piece 300 is greater than the deformable capacity of the edge region z2. By setting the maximum thickness of the center portion 321 to be less than the minimum thickness of the transition portion 323, and setting the maximum thickness of the transition portion 323 to be less than the minimum thickness of the edge portion 322, the deformable capacity of the transition region z3 is less than the deformable capacity of the center region z1, and greater than the deformable capacity of the edge region z2, so that the transition region z3 can receive the stress transmitted from the center region z1, and further transmit the stress to the edge region z2 more gently, which is beneficial to improving the stability and reliability of the thermal insulation piece 300. By setting the thickness of the center portion 321, the thickness of the transition portion 323 and the thickness of the edge portion 322 to be equal, not only can the center region z1, the transition region z3 and the edge region z2 of the thermal insulation piece 300 all have a certain structural strength, but it is also beneficial to the manufacture of the support structure 320.

[0133] According to some embodiments of the present application, please continue to refer to Figure 7 , and in combination with referring to Figures 12 to 14 , Figure 12 is a cross-sectional view of a portion of the support structure 320 in the center region z1 in some embodiments of the present application; Figure 13 is a cross-sectional view of a portion of the support structure 320 in the edge region z2 in some embodiments of the present application; Figure 14 is a cross-sectional view of a portion of the support structure 320 in the transition region z3 in some embodiments of the present application. In the cross section perpendicular to the thickness direction of the support structure 320, the cross-sectional shape of the through hole k in the center region z1 at least includes a hexagon; and / or, in the cross section perpendicular to the thickness direction of the support structure 320, the cross-sectional shape of the through hole k in the edge region z2 at least includes a hexagon; and / or, in the cross section perpendicular to the thickness direction of the support structure 320, the cross-sectional shape of the through hole k in the transition region z3 at least includes a hexagon.

[0134] Some manners in which the cross-sectional shape of the through hole k located at the central region z1, the cross-sectional shape of the through hole k located at the edge region z2, and the cross-sectional shape of the through hole k located at the transition region z3 can be implemented can refer to the content shown in some of the foregoing embodiments, and are not specifically limited herein.

[0135] In this way, by setting the cross-sectional shape of the through hole k located at the central region z1 to at least include a hexagon, the structural strength of the central region z1 of the thermal insulation piece 300 is further improved. By setting the cross-sectional shape of the through hole k located at the edge region z2 to at least include a hexagon, the structural strength of the edge region z2 of the thermal insulation piece 300 is further improved. By setting the cross-sectional shape of the through hole k located at the transition region z3 to at least include a hexagon, the structural strength of the transition region z3 of the thermal insulation piece 300 is further improved. The cross-sectional shape of the through hole k at different regions of the thermal insulation piece 300 all includes a hexagon, so that each region of the thermal insulation piece 300 can have a certain structural strength.

[0136] According to some embodiments of the present application, please continue to refer to Figure 7 , and in combination with referring to Figures 12 to 14 , in the cross section perpendicular to the thickness direction of the support structure 320, the cross-sectional shape of the through hole k located at the central region z1 is a regular hexagon, and the cross-sectional shape of the through hole k located at the transition region z3 is a hexagon; and / or, in the cross section perpendicular to the thickness direction of the support structure 320, the cross-sectional shape of the through hole k located at the edge region z2 includes a regular hexagon and a parallelogram.

[0137] In this way, by setting the cross-sectional shape of the through hole k located at the central region z1 to be a regular hexagon and the cross-sectional shape of the through hole k located at the transition region z3 to be a hexagon, on the one hand, since the structure of the regular hexagon has good symmetry and stability, not only can the stress at the central region z1 be more evenly dispersed, but also the central region z1 has a certain structural strength; on the other hand, since the structure of the hexagon has a certain stability, the transition region z3 has a certain structural strength, so as to facilitate the transition region z3 to buffer the stress transmitted from the central region z1 in a more stable state. By setting the cross-sectional shape of the through hole k located at the edge region z2 to include a regular hexagon and a parallelogram, not only can the structural stability of the edge region z2 be improved by using the structural characteristics of the regular hexagon, and the ability of the edge region z2 to absorb and relieve stress can be improved by using the structural characteristics of the parallelogram having a certain deformation ability, but also the part of the support structure 320 located at the edge region z2 can be more easily manufactured by virtue of the combination of the regular hexagon and the parallelogram. In addition, setting the cross-sectional shape of the through hole k to be a regular shape is also conducive to the manufacture of the support structure 320.

[0138] Therefore, by the cross-sectional shape of the through hole k shown in some of the above embodiments, the structural strength of the thermal insulation piece 300 can be improved, and thus the thickness of the thermal insulation piece 300 can be set smaller, thereby facilitating the reduction of the space occupied by the thermal insulation piece 300 in the battery device 10.

[0139] According to some embodiments of the present application, please continue to refer to Figure 7 , and in combination with referring to Figure 12 and Figure 13 , in the cross section perpendicular to the thickness direction of the support structure 320, the cross section of the through hole k located in the center region z1 has a plurality of first edges u1, and the cross section of the through hole k located in the edge region z2 has a plurality of second edges u2; the minimum length of the first edge u1 is greater than the maximum length of the second edge u2.

[0140] For example, the case where all the first edges u1 have the same length is illustrated by taking Figure 12 as an example, and the case where all the second edges u2 have the same length is illustrated by taking Figure 13 as an example. The length of the first edge u1 is a first length d1, and the length of the second edge u2 is a second length d2, that is, the first length d1 is greater than the second length d2.

[0141] Therefore, it is not only convenient to set the cross-sectional area of the through hole k located in the center region z1 larger, but also beneficial to improve the structural support strength of the edge region z2.

[0142] According to some embodiments of the present application, please continue to refer to Figure 7 , and in combination with referring to Figures 12 to 14 , the thermal insulation piece 300 further comprises a transition region z3; the transition region z3 is arranged around the center region z1, and the edge region z2 is arranged around the transition region z3. In the cross section perpendicular to the thickness direction of the support structure 320, the cross section of the through hole k located in the transition region z3 has a plurality of third edges u3, and the length of the third edge u3 has at least two size specifications. The minimum length of the third edge u3 is smaller than the minimum length of the first edge u1, and is greater than or equal to the maximum length of the second edge u2. The maximum length of the third edge u3 is smaller than or equal to the minimum length of the first edge u1.

[0143] The length of the third edge u3 has at least two size specifications, that is, there are two cases where the lengths of the third edges u3 are different. The difference between the corresponding multiple size specifications of the length of the third edge u3 can be set according to the specific use, which is not specifically limited here.

[0144] Thus, by controlling the side length of the cross section of the through hole k located in the transition region z3 and making the side length have at least two size specifications, it is not only beneficial to form the through hole k located in the transition region z3 more flexibly, but also beneficial to connect the transition region z3 between the central region z1 and the edge region z2, making it easier to make through holes k located in different regions.

[0145] Based on some embodiments of this application, please continue to refer to Figure 7 and in conjunction with reference Figure 14 The length of the third side u3 has two size specifications, and all third sides u3 include a first specification side and a second specification side. The length of the first specification side is equal to the length of the first side u1 adjacent to it. The first specification side and the first side u1 adjacent to it are defined by the boundary where the cross-sections of two adjacent through holes k are set opposite each other. The cross-sections of the two adjacent through holes k are both perpendicular to the thickness direction of the support structure 320. The length of the second specification side is less than the length of the first specification side.

[0146] For example, with Figure 14 For example, the length of the first specification side is the third length d3, and the length of the second specification side is the fourth length d4. The third length d3 is greater than the fourth length d4.

[0147] Since the first specification edge and the first edge u1 adjacent to it are defined by the boundary where the cross-sections of the two adjacent through holes k are set opposite each other, it is convenient to set the central part 321 and the transition part 323 of the support structure 320 adjacent to each other. Furthermore, the lengths of all third edges u3 have two different dimensions, which simplifies the structure of the transition part 323. Thus, by setting the length of the third edge u3 to have two different dimensions and controlling the size of these two dimensions, it is suitable for the transition region z3 to connect between the central region z1 and the edge region z2. This not only gives the support structure 320 a certain supporting performance but also facilitates the molding of the support structure 320.

[0148] Based on some embodiments of this application, please continue to refer to Figure 12 and Figure 13 The length of the first side u1 is greater than 50mm and less than or equal to 100mm. The length of the second side u2 is greater than or equal to 20mm and less than or equal to 50mm.

[0149] For example, the length of the first side u1 (i.e., the first length d1) can be 51mm, 60mm, 70mm, 80mm, 90mm, or 100mm, and the length of the second side u2 (i.e., the second length d2) can be 20mm, 30mm, 35mm, 40mm, 45mm, or 50mm. The first length d1 can be any value within the corresponding range, and the second length d2 can be any value within the corresponding range; no specific restrictions are imposed here.

[0150] In this way, by controlling the length of the first side u1, not only is it beneficial to make the through hole k in the central region z1 larger, so that stress can be transmitted and dispersed in a larger area, but also the central region z1 has a certain structural strength. By controlling the length of the second side u2, not only is it beneficial to improve the structural strength of the edge region z2, but also the through hole k in the edge region z2 also has a certain stress dispersion capability. In this way, the central region z1 and the edge region z2 of the thermal insulation piece 300 can cooperate with each other, so that the overall structure has a certain stress dispersion capability while having a certain structural strength.

[0151] According to some embodiments of the present application, please continue to refer to Figure 7 The support structure 320 includes a plurality of support walls g, and all the support walls g are connected in a predetermined manner and define all the through holes k.

[0152] The support wall g can be regarded as a sheet-like or plate-like structure. The predetermined manner refers to the connection manner between the support walls g, which can define through holes k of different sizes, define the distribution of through holes k in different regions, or define through holes k of different shapes. It can be set according to the specific use, which is not specifically limited here. Exemplarily, the support structure 320 can be made by a bonding process, a welding process, a rolling process or a stamping process. For example, a plurality of support walls g can define the distribution, size and shape of the required through holes k by a bonding process. For another example, the support structure 320 can form the required through holes k by a stamping process, and the corresponding support wall g can be defined between two adjacent through holes k.

[0153] In this way, by setting the support wall g, the support structure 320 is formed as a frame structure, which is not only beneficial to improve the support performance and structural strength of the support structure 320, but also beneficial to flexibly adjust the structural performance and function by changing the length, thickness, connection manner, etc. of the support wall g, so as to facilitate the manufacture of the support structure 320.

[0154] According to some embodiments of the present application, please continue to refer to Figure 7 The thickness of all the support walls g is the same; and / or the thickness of the support wall g is 10 µm to 180 µm. The thickness direction of the support wall g and the thickness direction of the support structure 320 are perpendicular to each other.

[0155] Exemplarily, the thickness of the support wall g can be 10 µm, 30 µm, 50 µm, 70 µm, 80 µm, 100 µm, 120 µm, 140 µm or 180 µm. The thickness of the support wall g can be any value within the corresponding range, which is not specifically limited here.

[0156] In this way, by setting the thickness of all the support walls g to be the same, the reliability of the structure is improved and the manufacture is facilitated. By controlling the thickness of the support walls g, the support walls g have a certain structural stability while reducing the space occupied by the support walls g, thereby facilitating the provision of more thermal insulation 330.

[0157] It should be noted that the length of the first edge u1, the length of the second edge u2 and the length of the third edge u3 shown in some of the foregoing embodiments can be regarded as the dimensions of the longitudinal extension direction of the support walls g in the direction perpendicular to the second direction F2 which define the through hole k. When the length of the third edge u3 has two size specifications, the corresponding support walls g include a first specification wall ga and a second specification wall gb.

[0158] According to some embodiments of the present application, please continue to refer to Figure 7 and Figure 12 The through hole k located in the central region z1 is provided with one. The area surrounded by the hole wall of the through hole k located in the central region z1 has a normal projection on the reference surface, and the normal projection of the central region z1 on the reference surface overlaps each other. The reference surface is a plane perpendicular to the thickness direction of the support structure 320.

[0159] In this way, a larger deformable space can be formed at the through hole k located in the central region z1, so that the deformability of the central region z1 of the thermal insulation piece 300 is further improved. At the same time, since the through hole k located in the central region z1 is provided with one, it is also convenient to manufacture the part of the support structure 320 located in the central region z1.

[0160] According to some embodiments of the present application, please continue to refer to Figures 8 to 10 The thickness of the support structure 320 is 0.2mm to 3mm; and / or the material of the support structure 320 includes at least one of polyester aluminum, silica gel, aluminum, polyurethane, polystyrene, and fiber reinforced plastic.

[0161] For example, Figure 8 and Figure 9 The thickness of the central part 321 of the support structure 320 (i.e. the first thickness h1), the thickness of the transition part 323 of the support structure 320 (i.e. the second thickness h2) and the thickness of the edge part 322 of the support structure 320 (i.e. the third thickness h3) are equal, and the first thickness h1, the second thickness h2 and the third thickness h3 are each any same value between 0.2mm and 3mm. For example, the first thickness h1, the second thickness h2 and the third thickness h3 can each be 0.2mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm. Figure 10For example, when the first thickness h1 is different from the second thickness h2 and the third thickness h3, the first thickness h1, the second thickness h2 and the third thickness h3 are mutually different values between 0.2 mm and 3 mm. The values can be set according to the use case, which is not specifically limited herein.

[0162] The materials of the portions of the support structure 320 can be the same or different. When the materials of the portions of the support structure 320 are the same, it is beneficial for processing and manufacturing the support structure 320. The materials of the support structure 320 can be flexibly selected according to the use requirements, which is not specifically limited herein.

[0163] In this way, by controlling the thickness of the support structure 320, not only does the support structure 320 have certain support performance and is easy to manufacture, but also it is beneficial to reduce the space occupied by the support structure 320, thereby being beneficial to reduce the space occupied by the thermal insulation piece 300 in the battery device 10. By controlling the material of the support structure 320, the support structure 320 has certain mechanical properties and certain physical properties, and also has processability and cost-effectiveness.

[0164] According to some embodiments of the present application, please continue to refer to Figures 8 to 10 The accommodation cavity Q has a first cavity wall b1 and a second cavity wall b2 oppositely and spaced apart along the thickness direction of the support structure 320, and a third cavity wall b3 connecting the first cavity wall b1 and the second cavity wall b2. Wherein, at least part of the side of the support structure 320 facing the first cavity wall b1 is connected or abuts with the first cavity wall b1; and / or, at least part of the side of the support structure 320 facing the second cavity wall b2 is connected or abuts with the second cavity wall b2; and / or, at least part of the side of the support structure 320 facing the third cavity wall b3 is connected or abuts with the third cavity wall b3.

[0165] For example, Figure 8 and Figure 9 For example, the side of the support structure 320 facing the first cavity wall b1 is connected with the first cavity wall b1, and the side of the support structure 320 facing the second cavity wall b2 is connected with the second cavity wall b2. For example, Figure 10 the side of the central portion 321 of the support structure 320 facing the first cavity wall b1 is spaced apart from the first cavity wall b1, and the side of the central portion 321 of the support structure 320 facing the second cavity wall b2 is spaced apart from the second cavity wall b2.

[0166] In this way, by controlling the relationship between the support structure 320 and the cavity walls in different directions of the accommodation cavity Q, a structure with different structural strength can be formed. In the case where at least part of the support structure 320 is connected or abuts against the cavity wall of the accommodation cavity Q, the structural strength of the thermal insulation piece 300 can be further improved, so that the deformation of the thermal insulation piece 300 can be further inhibited. In the case where part of the support structure 320 is not connected or abuts against the cavity wall of the accommodation cavity Q, the space for accommodating the thermal insulation material 330 can be increased, so that the heat insulation effect of the thermal insulation piece 300 can be further improved.

[0167] It should be noted that, in the case where the side of the support structure 320 facing the first cavity wall b1 is connected to the first cavity wall b1, the side of the support structure 320 facing the second cavity wall b2 is connected to the second cavity wall b2, and the side of the support structure 320 facing the third cavity wall b3 is connected to the third cavity wall b3, each through hole k on the support structure 320 forms a relatively closed space with the corresponding cavity wall, the thermal insulation material 330 is arranged in each through hole k, and the thermal insulation materials 330 in each through hole k are relatively independent of each other, so that the situation of local overheating caused by heat concentration can be improved. In addition, the overall structure can be more compact, and the space utilization rate can be improved.

[0168] According to some embodiments of the present application, please continue to refer to Figures 8 to 10 The packaging layer 310 includes two thermal insulation layers 311. The two thermal insulation layers 311 are arranged on two sides in the thickness direction of the support structure 320, and the edges of the two thermal insulation layers 311 are connected to each other and define the accommodation cavity Q.

[0169] In this way, by arranging the packaging layer 310 in the form of including two thermal insulation layers 311, in the process of heat transfer, the heat needs to pass through the two thermal insulation layers 311 in turn. Since each thermal insulation layer 311 hinders the transfer of heat, the heat transfer path is lengthened, and the transfer resistance is increased. At the same time, the accommodation cavity Q can be easily formed, so that the thermal insulation piece 300 can be easily manufactured.

[0170] Of course, in some other embodiments, the packaging layer 310 can also be composed of one thermal insulation layer 311. The thermal insulation layer 311 is bent and the opposite edge portions 322 of the thermal insulation layer 311 are connected to each other to form the accommodation cavity Q. This is not specifically limited herein.

[0171] It should be noted that, in the case where the packaging layer 310 includes two thermal insulation layers 311 and the support structure 320 and the thermal insulation material 330 are arranged in the accommodation cavity Q defined by the two thermal insulation layers 311, the thermal insulation piece 300 can be easily manufactured in a modular manner, so that batch manufacturing and assembly can be facilitated.

[0172] According to some embodiments of the present application, please continue to refer to Figures 8 to 10The material of the thermal insulation layer 311 includes at least one of polyethylene terephthalate, polyimide, polytetrafluoroethylene, and polyether ether ketone.

[0173] Specifically, the materials of the two thermal insulation layers 311 can be the same or different, which is not specifically limited here. The thermal insulation layer 311 can be a single-layer structure or a multi-layer structure, which is not specifically limited here.

[0174] In this way, by controlling the material of the thermal insulation layer 311, the thermal insulation layer 311 has certain thermal insulation performance, thermal stability, chemical stability, and mechanical performance, thereby facilitating the improvement of the thermal insulation performance, reliability, and stability of the thermal insulation piece 300. Flexible selection can be made according to the use, which is not specifically limited here.

[0175] According to some embodiments of the present application, please continue to refer to Figure 9 and Figure 10 The thickness of the thermal insulation layer 311 in the thickness direction of the support structure 320 is greater than or equal to 6 µm; the thickness direction of the support structure 320 is parallel to the arrangement direction of the adjacent two battery monomers 100.

[0176] The thickness of the thermal insulation layer 311 is a fourth thickness h4. That is, the fourth thickness h4 is greater than or equal to 6 µm. For example, the fourth thickness h4 can be 6 µm, 8 µm, 10 µm, 15 µm, 20 µm, or 25 µm. The upper limit of the fourth thickness h4 can be determined according to the use space in the battery device 10, which is not specifically limited here.

[0177] In this way, by controlling the material of the thermal insulation layer 311, the space occupied by the thermal insulation piece 300 is further reduced while facilitating the manufacture of the thermal insulation layer 311 and making the thermal insulation layer 311 have certain thermal insulation performance.

[0178] According to some embodiments of the present application, please continue to refer to Figure 8 The edges of the two thermal insulation layers 311 are connected by a preset mode. The preset mode includes at least one of a heat sealing process and an ultrasonic welding process.

[0179] In this way, the two thermal insulation layers 311 are connected by the heat sealing process and / or the ultrasonic welding process, which not only makes the packaging layer 310 have certain sealing effect and the edges of the two thermal insulation layers 311 have certain connection strength, but also facilitates the processing and manufacturing. In this way, the overall structure of the thermal insulation piece 300 can have certain stability, sealing property, and aesthetic property.

[0180] According to some embodiments of the present application, please continue to refer to Figure 6 and Figure 8 The thermal insulation piece 330 includes thermal insulation particles.

[0181] Thermal insulation particles are a kind of tiny particle-like substances with thermal insulation performance, which are usually used to prepare thermal insulation materials or added to other materials to enhance their thermal insulation effect. The particle size of thermal insulation particles can be in the micron to nanometer level, and the thermal insulation particles have a low thermal conductivity, which can hinder the transfer of heat.

[0182] In this way, by setting the thermal insulation 330 to include thermal insulation particles, due to the low thermal conductivity characteristic of the thermal insulation particles, a large number of tiny thermal insulation units can be formed inside the material. When heat is transferred through the thermal insulation 330 containing thermal insulation particles, the heat needs to undergo complex processes such as conduction, scattering, etc. among these thermal insulation particles, greatly increasing the path length and difficulty of heat transfer, thereby effectively hindering the conduction of heat and significantly improving the thermal insulation effect of the thermal insulation 300. At the same time, by distributing the thermal insulation 330 in the thermal insulation 330, the external force can be resisted to some extent, and the stress on the material can be shared, so that the thermal insulation 330 containing thermal insulation particles has better toughness and anti-deformation ability under the impact of external force, extrusion, etc.

[0183] According to some embodiments of the present application, please continue to refer to Figure 6 and Figure 8 The material of the thermal insulation particles includes at least one of alumina micro-nano material, silicon oxide micro-nano material, and silicon nitride micro-nano material; and / or, the density of the thermal insulation particles is 0.5 g / cm³ to 3.0 g / cm³; and / or, the compressibility of the thermal insulation particles under a target pressure is 30% to 60%; and / or, the mass fraction of the thermal insulation particles in the thermal insulation 330 is greater than or equal to 50%.

[0184] For example, the density of the thermal insulation particles can be 0.5 g / cm³, 1 g / cm³, 1.5 g / cm³, 2 g / cm³, 2.2 g / cm³, 2.8 g / cm³, or 3.0 g / cm³. The density of the thermal insulation particles can be any value within the corresponding range, which is not specifically limited here.

[0185] The compressibility of the thermal insulation particles under a target pressure is a physical quantity representing the degree of relative compression change in the volume of the thermal insulation particles when subjected to the target pressure. The compressibility reflects the ability of the thermal insulation particles to resist compression deformation under a certain pressure environment. The greater the compressibility, the greater the relative change in the volume of the thermal insulation particles under that pressure, i.e. the relatively weaker the ability to resist compression deformation; on the contrary, the smaller the compressibility, the smaller the relative change in the volume of the thermal insulation particles under that pressure, i.e. the relatively stronger the ability to resist compression deformation.

[0186] Exemplarily, the compressibility of the thermal insulation particles under a pressure of 2 MPa can be 30%, 35%, 40%, 45%, 50%, 55%, or 60%. The compressibility of the thermal insulation particles under a pressure of 2 MPa can be any value within the corresponding range, which is not specifically limited herein.

[0187] The mass fraction of the thermal insulation particles in the thermal insulation 330 refers to the ratio of the mass of the thermal insulation particles to the total mass of the thermal insulation 330, which is a parameter affecting the performance of the thermal insulation 330. Appropriately increasing the mass fraction of the thermal insulation particles in the thermal insulation 330 means that more thermal insulation units exist in the thermal insulation 330, which can more effectively hinder the conduction, convection, and radiation of heat transfer, thereby improving the overall thermal insulation effect. At the same time, the required structural strength, thermal insulation performance, cushioning performance, etc. can be obtained by cooperating with the control of the density and material of the thermal insulation particles.

[0188] Exemplarily, the mass fraction of the thermal insulation particles in the thermal insulation 330 can be 50%, 55%, 60%, 65%, 70%, or 80%. The upper limit of the mass fraction of the thermal insulation particles in the thermal insulation 330 can be determined according to specific use cases, which is not specifically limited herein.

[0189] In this way, by controlling the material of the thermal insulation particles, the thermal insulation particles not only have certain thermal insulation ability, high temperature resistance, chemical stability, and certain material strength, but also are convenient for processing and forming. By controlling the density of the thermal insulation particles, the thermal insulation particles not only have certain thermal insulation effect, but also can adjust the strength and toughness of the thermal insulation particles, thereby improving the thermal insulation performance and reliability of the thermal insulation 300. By controlling the compressibility of the thermal insulation particles, it is beneficial for the thermal insulation 330 to deform to absorb stress and reduce damage to the shell 110 or other structures.

[0190] According to some embodiments of the present application, please continue to refer to Figure 4 , Figure 5 and Figure 6 , the center of the orthographic projection of the central region z1 on the large face m of the corresponding battery monomer 100 and the center of the large face m coincide with each other; and / or, the orthographic projection of the thermal insulation 300 on the large face m of the battery monomer 100 adjacent to the thermal insulation 300 completely covers the large face m of the adjacent battery monomer 100; and / or, the ratio of the area of the orthographic projection of the central region z1 on the large face m of the corresponding battery monomer 100 to the area of the large face m of the corresponding battery monomer 100 is 0.1 to 0.5.

[0191] For example, the ratio of the area of the central region z1 in the orthogonal projection on the large face m of the corresponding battery monomer 100 to the area of the large face m of the corresponding battery monomer 100 can be 0.1, 0.15, 0.2, 0.25, 0.3, 0.4 or 0.5. The ratio of the area of the central region z1 in the orthogonal projection on the large face m of the corresponding battery monomer 100 to the area of the large face m of the corresponding battery monomer 100 can be any value within the corresponding range, which is not specifically limited herein.

[0192] In this way, by setting the central region z1 to be substantially orthogonal to the large face m of the battery monomer 100, the expansion force of the battery monomer 100 can be further more effectively absorbed. By completely covering the large face m of the battery monomer 100 with the heat insulation pad, the large faces m of two adjacent battery monomers 100 can be blocked, thereby facilitating the improvement of the heat insulation effect and further improving the ability to slow down the thermal runaway of the battery device 10. By controlling the size of the central region z1 based on the size of the large face m of the battery monomer 100, the buffering performance of the heat insulation member 300 to the expansion force of the battery monomer 100 can be further improved.

[0193] According to some embodiments of the present application, the present application provides a power consuming device comprising the battery device 10 in any of the above embodiments. The battery device 10 is used to power the power consuming device. The power consuming device can be any of the devices or systems mentioned above which apply the battery device 10.

[0194] The power consuming device also has the advantages of the battery device 10 in any of the above embodiments, which will not be repeated here.

[0195] According to some embodiments of the present application, the present application provides a heat insulation member 300 for a battery device 10, the battery device 10 comprising a plurality of battery monomers 100, the heat insulation member 300 being arranged between the large faces m of at least two adjacent battery monomers 100; the heat insulation member 300 comprising a central region z1 and an edge region z2 arranged around the central region z1, the central region z1 in the orthogonal projection on the large face m of the corresponding battery monomer 100 covering the center of the large face m, the deformability of the central region z1 being greater than that of the edge region z2.

[0196] The heat insulation member 300 also has the advantages of the battery device 10 in any of the above embodiments, which will not be repeated here. It should be noted that the heat insulation member 300 in any of the above embodiments can also be implemented, which will not be repeated here.

[0197] According to some embodiments of the present application, please refer to Figure 4 , Figures 6 to 9 , Figures 11 to 14The battery device 10 includes a plurality of cells and a plurality of thermal insulation members 300, and any two adjacent battery cells 100 are provided with a thermal insulation member 300 between the large faces m of the two battery cells 100. The thermal insulation member 300 includes a center region z1, a transition region z3 arranged around the center region z1, and an edge region z2 arranged around the transition region z3. The center region z1 is arranged such that the center of the center region z1 and the center of the large face m of the corresponding battery cell 100 coincide with each other in the orthogonal projection of the large face m of the corresponding battery cell 100. The ratio of the area of the center region z1 in the orthogonal projection of the large face m of the corresponding battery cell 100 to the area of the large face m of the corresponding battery cell 100 is 0.1 to 0.5. The thermal insulation member 300 is arranged such that the orthogonal projection of the thermal insulation member 300 on the large face m of the battery cell 100 adjacent to the thermal insulation member 300 completely covers the large face m of the adjacent battery cell 100. The thermal insulation member 300 includes a packaging layer 310, a support structure 320, and a thermal insulation material 330. The packaging layer 310 includes two thermal insulation layers 311 arranged on both sides of the support structure 320 in the thickness direction of the support structure 320, and the edges of the two thermal insulation layers 311 are connected to each other and define a receiving cavity Q. The support structure 320 is arranged in the receiving cavity Q. The support structure 320 includes a plurality of support walls g, and all the support walls g are connected in a predetermined manner and define a plurality of through holes k. The through hole k located in the center region z1 is one, and the cross-sectional shape of the through hole k located in the center region z1 is a regular hexagon. The through holes k located in the edge region z2 are arranged around the through hole k located in the center region z1, and the cross-sectional shape of the through holes k located in the edge region z2 is a hexagon. The cross-sectional shape of the through holes k located in the transition region z3 includes a regular hexagon and a rhombus. The side of the support structure 320 facing the first cavity wall b1 of the receiving cavity Q is connected to the first cavity wall b1, the side of the support structure 320 facing the second cavity wall b2 of the receiving cavity Q is connected to the second cavity wall b2, and the side of the support structure 320 facing the third cavity wall b3 of the receiving cavity Q is connected to the third cavity wall b3. The thermal insulation material 330 includes thermal insulation particles, and the thermal insulation material 330 is arranged in the through holes k.

[0198] It should be noted that in other embodiments, the transition region z3 can be arranged or not arranged, which is not specifically limited here.

[0199] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device (10) characterized by, The application relates to a battery pack, comprising: a plurality of battery cells (100); and a thermal insulation member (300) arranged between large faces (m) of at least two adjacent battery cells (100); the thermal insulation member (300) comprises a central region (z1) and an edge region (z2) arranged around the central region (z1), the central region (z1) covers the center of a corresponding large face (m) in an orthogonal projection on the large face (m) of the corresponding battery cell (100), and the deformability of the central region (z1) is greater than that of the edge region (z2).

2. The battery device (10) according to claim 1, characterized in that The thermal insulation member (300) comprises: a packaging layer (310) having a receiving cavity (Q); a support structure (320) arranged in the receiving cavity (Q); and a thermal insulation member (330) arranged in a space defined by the support structure (320) and the inner wall of the receiving cavity (Q).

3. The battery device (10) according to claim 2, characterized in that A plurality of through holes (k) are arranged in the thickness direction of the support structure (320), and at least part of the thermal insulation member (330) is arranged in the plurality of through holes (k); In a cross section perpendicular to the thickness direction of the support structure (320), the minimum cross-sectional area of the through hole (k) in the central region (z1) is greater than the maximum cross-sectional area of the through hole (k) in the edge region (z2); and the thickness direction of the support structure (320) is parallel to the arrangement direction of the adjacent two battery cells (100).

4. The battery device (10) according to claim 3, characterized in that The support structure (320) comprises a central part (321) in the central region (z1) and an edge part (322) in the edge region (z2); wherein the maximum thickness of the central part (321) is less than the minimum thickness of the edge part (322); or the thickness of the central part (321) is equal to the thickness of the edge part (322).

5. The battery device (10) according to claim 3, characterized in that In a cross section perpendicular to the thickness direction of the support structure (320), the cross-sectional shape of the through hole (k) in the central region (z1) comprises at least a hexagon; and / or In a cross section perpendicular to the thickness direction of the support structure (320), the cross-sectional shape of the through hole (k) in the edge region (z2) comprises at least a hexagon.

6. The battery device (10) according to claim 3, characterized in that The thermal insulation member (300) further comprises a transition region (z3); the transition region (z3) is arranged around the central region (z1), and the edge region (z2) is arranged around the transition region (z3); In a cross section perpendicular to the thickness direction of the support structure (320), the minimum cross-sectional area of the through hole (k) in the central region (z1) is greater than the maximum cross-sectional area of the through hole (k) in the transition region (z3), and the minimum cross-sectional area of the through hole (k) in the transition region (z3) is greater than the maximum cross-sectional area of the through hole (k) in the edge region (z2).

7. The battery device (10) according to claim 6, characterized in that The support structure (320) comprises a center part (321) located in the center area (z1), a transition part (323) located in the transition area (z3), and an edge part (322) located in the edge area (z2); The maximum thickness of the center part (321) is less than the minimum thickness of the edge part (322); or The maximum thickness of the center part (321) is less than the minimum thickness of the transition part (323), and the maximum thickness of the transition part (323) is less than the minimum thickness of the edge part (322); or The thickness of the center part (321), the thickness of the transition part (323), and the thickness of the edge part (322) are equal.

8. The battery device (10) according to claim 6, characterized in that In a cross section perpendicular to the thickness direction of the support structure (320), the cross-sectional shape of the through hole (k) located in the center area (z1) at least includes a hexagon; and / or In a cross section perpendicular to the thickness direction of the support structure (320), the cross-sectional shape of the through hole (k) located in the edge area (z2) at least includes a hexagon; and / or In a cross section perpendicular to the thickness direction of the support structure (320), the cross-sectional shape of the through hole (k) located in the transition area (z3) at least includes a hexagon.

9. The battery device (10) according to claim 8, characterized in that In a cross section perpendicular to the thickness direction of the support structure (320), the cross-sectional shape of the through hole (k) located in the center area (z1) is a regular hexagon, and the cross-sectional shape of the through hole (k) located in the transition area (z3) is a hexagon; and / or In a cross section perpendicular to the thickness direction of the support structure (320), the cross-sectional shape of the through hole (k) located in the edge area (z2) includes a regular hexagon and a parallelogram.

10. The battery device (10) according to any one of claims 3-9, characterized in that In a cross section perpendicular to the thickness direction of the support structure (320), the cross section of the through hole (k) located in the center area (z1) has a plurality of first edges (u1), and the cross section of the through hole (k) located in the edge area (z2) has a plurality of second edges (u2); The minimum length of the first edge (u1) is greater than the maximum length of the second edge (u2).

11. The battery device (10) according to claim 10, characterized in that The thermal insulation piece (300) further comprises a transition area (z3); the transition area (z3) is arranged around the center area (z1), and the edge area (z2) is arranged around the transition area (z3); In a cross section perpendicular to the thickness direction of the support structure (320), the cross section of the through hole (k) located in the transition area (z3) has a plurality of third edges (u3); the lengths of the third edges (u3) have at least two specifications; the minimum length of the third edge (u3) is less than the minimum length of the first edge (u1) and greater than or equal to the maximum length of the second edge (u2); and the maximum length of the third edge (u3) is less than or equal to the minimum length of the first edge (u1).

12. The battery device (10) according to claim 11, characterized in that The lengths of the third edges (u3) have two specifications, and all the third edges (u3) include first specification edges and second specification edges; The length of the first specification edge is equal to the length of the first edge (u1) adjacent to the first specification edge; the first specification edge and the first edge (u1) adjacent to the first specification edge are defined by the opposite edges of the cross sections of two adjacent through holes (k); the cross sections of the two adjacent through holes (k) are both perpendicular to the thickness direction of the support structure (320); The length of the second specification edge is less than the length of the first specification edge.

13. The battery device (10) according to claim 10, characterized in that The length of the first edge (u1) is greater than 50mm and less than or equal to 100mm; the length of the second edge (u2) is greater than or equal to 20mm and less than or equal to 50mm.

14. The battery device (10) according to any one of claims 3-9, characterized in that, The support structure (320) comprises a plurality of support walls (g), and all the support walls (g) are connected in a preset manner and define all the through holes (k).

15. The battery device (10) according to claim 14, characterized in that The thicknesses of all the support walls (g) are the same; and / or The thickness of the support wall (g) is 10µm to 180µm; The thickness direction of the support wall (g) and the thickness direction of the support structure (320) are perpendicular to each other.

16. The battery device (10) according to any one of claims 3-9, characterized by The through hole (k) located in the center area (z1) is provided with one; The area surrounded by the hole wall of the through hole (k) located in the center area (z1) and the normal projection of the center area (z1) on the reference surface overlap each other; The reference surface is a plane perpendicular to the thickness direction of the support structure (320).

17. The battery device (10) according to any one of claims 2-9, characterized in that The thickness of the support structure (320) is 0.2mm to 3mm; and / or The material of the support structure (320) comprises at least one of polyester aluminum, silica gel, aluminum, polyurethane, polystyrene, and fiber reinforced plastic.

18. The battery device (10) according to any one of claims 2-9, characterized in that The accommodation cavity (Q) has a first cavity wall (b1) and a second cavity wall (b2) oppositely and spacedly arranged along the thickness direction of the support structure (320), and a third cavity wall (b3) connecting the first cavity wall (b1) and the second cavity wall (b2); The at least part of the side of the support structure (320) facing the first cavity wall (b1) is connected or abuts with the first cavity wall (b1); and / or The at least part of the side of the support structure (320) facing the second cavity wall (b2) is connected or abuts with the second cavity wall (b2); and / or The at least part of the side of the support structure (320) facing the third cavity wall (b3) is connected or abuts with the third cavity wall (b3).

19. The battery device (10) according to any one of claims 2-9, characterized in that The packaging layer (310) comprises two heat insulation layers (311); The two heat insulation layers (311) are respectively arranged on both sides in the thickness direction of the support structure (320), and the edges of the two heat insulation layers (311) are connected with each other and define the accommodation cavity (Q).

20. The battery device (10) according to claim 19, characterized in that The material of the heat insulation layer (311) comprises at least one of polyethylene terephthalate, polyimide, polytetrafluoroethylene, and polyether ether ketone.

21. The battery device (10) according to claim 19, characterized in that The thickness of the heat insulation layer (311) is greater than or equal to 6µm along the thickness direction of the support structure (320). A thickness direction of the support structure (320) is parallel to an arrangement direction of two adjacent battery monomers (100).

22. The battery device (10) according to claim 19, characterized in that Edges of two adjacent thermal insulation layers (311) are connected by a preset mode. The preset mode includes at least one of a heat sealing process and an ultrasonic welding process.

23. The battery device (10) according to any one of claims 2-9, characterized by The thermal insulation (330) includes thermal insulation particles.

24. The battery device (10) according to claim 23, characterized in that The thermal insulation particles include at least one of an alumina micro-nano material, a silicon oxide micro-nano material, and a silicon nitride micro-nano material. The density of the thermal insulation particles is 0.5 g / cm³ to 3.0 g / cm³. The compressibility of the thermal insulation particles under a pressure of 2 MPa is 30% to 60%. The mass fraction of the thermal insulation particles in the thermal insulation (330) is greater than or equal to 50%.

25. The battery device (10) according to any one of claims 1-9, characterized by The center area (z1) is coincident with the center of the normal projection of the large face (m) of the corresponding battery monomer (100) on the large face (m) and the center of the large face (m). The thermal insulation (300) completely covers the large face (m) of the adjacent battery monomer (100) in the normal projection of the thermal insulation (300) on the large face (m) of the adjacent battery monomer (100). The area ratio of the center area (z1) to the large face (m) of the corresponding battery monomer (100) is 0.1 to 0.

5.

26. An electrical device, comprising: The battery device (10) includes a plurality of battery monomers (100), and the thermal insulation (300) is arranged between large faces (m) of at least two adjacent battery monomers (100).

27. A thermal insulation (300) for a battery device (10), characterized in that The thermal insulation (300) includes a center area (z1) and an edge area (z2) surrounding the center area (z1), the center area (z1) covers the center of the normal projection of the large face (m) of the corresponding battery monomer (100) on the large face (m), and the deformability of the center area (z1) is greater than that of the edge area (z2). ​

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