Battery device and electric equipment

Abstract

The utility model provides a battery device and electric equipment. The battery device comprises a battery box body, the plurality of battery assemblies are arranged in the battery box body and are arranged along a first direction, and each battery assembly comprises a plurality of battery monomers arranged along a second direction; the first direction intersects with the second direction; each single battery is provided with a first side surface and a second side surface with the area smaller than that of the first side surface, and an insulating part is arranged between the second side surfaces of at least part of two adjacent single batteries in the plurality of battery assemblies; the insulating part comprises an insulating body and a convex structure; the insulating body is provided with a first surface and a second surface which are opposite. The protruding structures are arranged on the first surface and / or the second surface and abut against the adjacent single batteries; a first cavity is formed between the first surface of the insulating body and the adjacent battery monomer; and / or a second cavity is formed between the second surface and the adjacent battery monomer. The battery device reduces the risk of thermal runaway of the battery monomers.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery device and electrical equipment. Background Art

[0002] With the continuous development of power battery technology, the safety of battery devices is receiving increasing attention. Thermal runaway is the most serious safety incident in power battery devices. When a battery cell in a battery device experiences thermal runaway, it generates a large amount of heat, which is transferred to the surrounding area, rapidly triggering large-scale thermal runaway of surrounding battery cells. This can lead to fire or even explosion of the battery device, directly threatening the safety of users.

[0003] Therefore, it is necessary to dissipate heat from the battery cells that have thermal runaway. However, existing battery devices have poor heat dissipation effects on the heat generated by thermal runaway battery cells, which can easily lead to thermal runaway of adjacent battery cells, thus causing a chain reaction of runaway. Utility Model Content

[0004] The purpose of the present application is to provide a battery device and electrical equipment to solve the technical problem that the existing battery device has poor heat dissipation effect on the heat generated by thermal runaway of battery cells, which easily leads to thermal runaway of adjacent battery cells, thereby causing a chain reaction of runaway.

[0005] To solve the above technical problems, the present application adopts a technical solution: providing a battery device. The battery device includes:

[0006] Battery box;

[0007] A plurality of battery assemblies are disposed in the battery case and arranged along a first direction, each of the battery assemblies including a plurality of battery cells arranged along a second direction; the first direction intersects the second direction; the battery cells have two first side surfaces facing each other along the first direction and two second side surfaces facing each other along the second direction; the first side surface has an area greater than the second side surface;

[0008] An insulating member is provided between the second side surfaces of at least some of the adjacent two battery cells in the multiple battery assemblies; and the insulating member includes an insulating body and a protruding structure; the insulating body has a first surface and a second surface opposite to each other; the protruding structure is provided on the first surface and / or the second surface and abuts against the second side surface of the adjacent battery cell; and a first cavity is formed between the first surface of the insulating body and the adjacent battery cell; and / or a second cavity is formed between the second surface and the adjacent battery cell.

[0009] The above-mentioned battery device, by providing the insulating member between at least some of the second side surfaces of two adjacent battery cells in a plurality of battery assemblies, can further absorb the heat released by the battery cell through the insulating member provided on the second side surface. In this way, the heat dissipated by the battery cell through the first side surface is relatively small, effectively reducing the temperature of another battery cell adjacent to the battery cell along the first direction, thereby reducing the risk of chain runaway of the other battery cell due to heat. In addition, by providing the insulating member with an insulating body, the two adjacent battery cells are electrically isolated by the insulating body, thereby reducing the risk of short circuit between the two adjacent battery cells. In addition, by providing the insulating member with a protruding structure, the protruding structure is provided on the first surface and / or the second surface, and abuts against the second side surface of the adjacent battery cell, so that the insulating member is in direct contact with the battery cell, thereby improving the heat conduction efficiency and allowing the insulating member to absorb more heat generated by thermal runaway of the battery cell. Furthermore, by forming a first cavity between the first surface of the insulating body and the adjacent battery cell; and / or forming a second cavity between the second surface and the adjacent battery cell, a certain expansion space can be provided for the battery cell on the corresponding side through the first cavity and / or the second cavity, which is beneficial to reducing the risk of failure of the battery device.

[0010] In one embodiment of the present application, the thermal conductivity of the insulating body and / or the protruding structure is greater than or equal to 0.1 W / mK.

[0011] The above solution allows the insulating member to absorb more heat generated by the battery cell due to thermal runaway, thereby reducing the temperature of another battery cell adjacent to the battery cell and reducing the risk of thermal runaway of the adjacent battery cell.

[0012] In one embodiment of the present application, the protruding structure is an elastic structure.

[0013] The above solution can alleviate the expansion force between the battery cell and the insulating member, which is beneficial to reducing the risk of battery device failure.

[0014] In one embodiment of the present application, the present invention further includes: a plurality of cold plates, wherein one cold plate is provided on both sides of each battery cell along the first direction, and portions of the cold plates are arranged in contact with adjacent battery cells; portions of the cold plates are spaced apart from adjacent battery cells to form a third cavity; wherein the insulating member is provided between the second side surfaces of each two adjacent battery cells.

[0015] The above solution, by placing a cold plate on either side of each battery cell along the first direction and aligning portions of the cold plate with adjacent battery cells, can further utilize the cold plate to dissipate heat from the battery cells, thereby further reducing the amount of heat transferred from the battery cells to adjacent large-area battery cells, thereby reducing the risk of thermal runaway in the large-area battery cells. Furthermore, aligning the cold plate with the battery cells can increase heat conduction efficiency. Furthermore, by spacing portions of the cold plate from adjacent battery cells to form a third cavity, a sufficient amount of expansion space can be provided for thermal expansion of the battery cells along the first direction, effectively reducing the risk of battery device failure.

[0016] In one embodiment of the present application, the protrusion structure includes two first protrusions, which extend along the length direction of the insulating body, and the two first protrusions are arranged on both side edges of the insulating body along the width direction of the insulating body.

[0017] The above solution not only allows the heat generated by thermal runaway of the battery cells to be transferred to the insulating body via the two first protrusions for dissipation, but also allows the first cavity and / or the second cavity to be open at both ends along the length of the insulating body to allow air to pass through, thereby allowing the first cavity and / or the second cavity to double as cooling air ducts. The airflow passing through the first cavity and / or the second cavity further removes some of the heat from the battery cells, thereby further reducing the heat of the battery cells and the risk of thermal runaway of adjacent battery cells. Furthermore, the space in the first cavity and / or the second cavity can be made sufficiently large to provide sufficient expansion space for thermal expansion of the battery cells.

[0018] In one embodiment of the present application, the protrusion structure further includes a plurality of second protrusions, which extend along the width direction of the insulating body and are provided at least on two side edges of the insulating body along the length direction of the insulating body.

[0019] The above solution can reduce the risk that the middle area of ​​the insulating body along its width direction fits with the battery cell, resulting in the inability to form the first cavity and / or the second cavity, or the space of the first cavity and / or the second cavity is too small; at the same time, it can increase the contact area between the insulating part and the battery cell to improve the heat dissipation efficiency.

[0020] In one embodiment of the present application, at least one second protrusion is also provided in the middle region of the insulating body along its length direction.

[0021] This solution reduces the risk of the insulating member's longitudinal middle region abutting the second side surface of the battery cell, preventing the formation of the first and / or second cavities, or creating a small space between the first and / or second cavities, when the insulating member is relatively large. Furthermore, it increases the contact area between the insulating member and the battery cell, further improving the heat dissipation efficiency of the battery cell and reducing the risk of thermal runaway in adjacent battery cells.

[0022] In one embodiment of the present application, the first protrusion includes a first rib and / or a plurality of first protrusions; the first rib extends along the length direction of the insulating body; the plurality of first protrusions are spaced apart along the length direction of the insulating body;

[0023] The second protrusion includes a second rib and / or a plurality of second bumps; the second rib extends along the width direction of the insulating body; and the plurality of second bumps are arranged at intervals along the width direction of the insulating body.

[0024] The above solution, by making the raised portion include continuously distributed ribs, can increase the contact area between the raised portion and the battery cell, thereby improving heat conduction efficiency and more quickly reducing the heat generated by thermal runaway of the battery cell. And / or by making the raised portion include multiple spaced-apart bumps, while the bumps are used for heat conduction, the gaps between two adjacent bumps can also form expansion space for the battery cell, thereby reducing the risk of battery device failure. These gaps can also be used to form cooling air ducts, allowing some air to flow through the gaps and remove some of the heat from the battery cell, further improving heat dissipation efficiency.

[0025] In one embodiment of the present application, the thickness of the insulating body is greater than or equal to 0.05 mm and less than or equal to 2 mm; and / or the thickness of the protruding structure is greater than or equal to 0.05 mm and less than or equal to 4 mm.

[0026] The above solution allows the insulating member of this application to be placed between two adjacent battery cells while maintaining the original spacing between the battery cells, thereby improving the heat dissipation capacity of the second side surface of the battery cells. Furthermore, using an insulating body with a smaller thickness can increase the heat dissipation capacity of the insulating member and form a cavity between the first and / or second surfaces of the insulating body and the adjacent battery cells, providing sufficient expansion space for the battery cells.

[0027] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide an electrical device, which includes the battery device mentioned above.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0030] Figure 1 A schematic diagram of the structure of the electrical equipment provided for this application;

[0031] Figure 2 A schematic structural diagram of a battery device provided in some embodiments of the present application;

[0032] Figure 3 A schematic diagram of the positions of multiple battery components and insulating members provided in one embodiment of the present application;

[0033] Figure 4 Provided for an embodiment of this application Figure 3 AA section diagram in the figure;

[0034] Figure 5 Another embodiment of the present application provides Figure 3 AA section diagram in the figure;

[0035] Figure 6 A schematic diagram of the positions of multiple battery assemblies and a cold plate provided in one embodiment of the present application;

[0036] Figure 7 Provided for an embodiment of this application Figure 6 BB-direction cross-sectional diagram;

[0037] Figure 8 A front view of an insulating member provided in the first embodiment of the present application;

[0038] Figure 9a A front view of an insulating member provided in a second embodiment of the present application;

[0039] Figure 9b A front view of an insulating member provided in a third embodiment of the present application;

[0040] Figure 10 A front view of an insulating member provided in a fourth embodiment of the present application;

[0041] Figure 11 for Figure 3 The insulating parts are Figure 10 A simplified cross-sectional view in the direction DD of the structure corresponding to the insulating member shown;

[0042] Figure 12 for Figure 3 The insulating parts are Figure 10 Another DD-direction cross-sectional diagram of the structure corresponding to the insulating member shown;

[0043] Figure 13 This is a front view of the insulating part provided in the fifth embodiment of the present application.

[0044] Description of reference numerals:

[0045] 100 electrical components;

[0046] 200 battery device; 10 battery case; 11 upper cover; 12 lower cover; 20 battery assembly; 21 battery cell; 30 insulating member; 31 insulating body; 32 protruding structure; 33 first cavity; 34 second cavity; 35 first protruding portion; 351 first rib; 352 first bump; 36 second protruding portion; 361 second rib; 362 second bump;

[0047] 40 cold plate; 41 third cavity. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0051] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0056] In the related art, to reduce the amount of heat generated by thermal runaway battery cells that is transferred to the surrounding area, a thermal insulation pad is generally placed between the sides of two adjacent battery cells to reduce the amount of heat transferred to the adjacent battery cells. However, the thermal conductivity of the thermal insulation pad is generally low, approximately 0.02 W / mK. Therefore, although the thermal insulation pad has a good thermal insulation effect, its heat dissipation performance will be affected to a certain extent, resulting in less heat generated by thermal runaway battery cells being transferred to the sides of the battery cells. The battery cells mainly dissipate heat through their large surfaces, and after the battery cells adjacent to the large surfaces absorb a certain amount of heat, the adjacent battery cells also lack an interface for rapid heat dissipation, resulting in thermal runaway of the adjacent battery cells themselves, which in turn leads to a chain reaction of runaway.

[0057] To this end, an embodiment of the present application provides a new battery device, which can absorb more heat through an insulating part arranged on the side of the battery cell, thereby reducing the temperature of another battery cell adjacent to the large surface of the battery cell, and reducing the risk of thermal runaway of the other battery cell adjacent to the large surface.

[0058] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0059] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of an electrical device provided in this application. In one embodiment, an electrical device is provided, comprising an electrical device 100 and a battery assembly 200 electrically connected to the electrical device 100. The battery assembly 200 is used to provide electrical energy to the electrical device, enabling the electrical device 100 to operate. The specific structure and function of the battery assembly 200 are described below.

[0060] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. For the convenience of explanation, the following embodiments are described using the electric equipment as a vehicle as an example.

[0061] The electrical device 100 may be an element or device that can consume electricity; the electrical device 100 may be a controller and an electronic component, etc. The controller may be a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0062] In some examples, the electric device may be a vehicle, and the electric device 100 may be a lamp (e.g., headlight, taillight, etc.), display screen, instrument panel, control system (e.g., controller), etc. The vehicle may also include a frame, and the battery device 200 and the electric device 100 are both mounted on the vehicle body.

[0063] Please refer to Figures 2 to 5 , Figure 2 A schematic structural diagram of a battery device 200 provided in some embodiments of the present application; Figure 3 A schematic diagram showing the positions of multiple battery assemblies 20 and insulating members 30 provided in one embodiment of the present application; Figure 4 Provided for an embodiment of this application Figure 3 AA section diagram in the figure; Figure 5 Another embodiment of the present application provides Figure 3 AA section diagram in the figure.

[0064] In one embodiment, a battery device 200 is provided. The battery device 200 may include a battery case 10, a plurality of battery assemblies 20, and an insulating member 30. Figure 3 , multiple battery assemblies 20 are arranged in the battery case 10 and arranged along the first direction Y, each battery assembly 20 includes multiple battery cells 21 arranged along the second direction X; the first direction Y intersects the second direction X; the battery cell 21 has two first side surfaces opposite to each other along the first direction Y and two second side surfaces opposite to each other along the second direction X; the area of ​​the first side surface is larger than the area of ​​the second side surface; an insulating member 30 is provided between the second side surfaces of at least some adjacent two battery cells 21 in the multiple battery assemblies 20; and combined Figure 4 and Figure 5 The insulating member 30 includes an insulating body 31 and a protruding structure 32; the insulating body 31 has a first surface and a second surface opposite to each other; the protruding structure 32 is provided on the first surface and / or the second surface of the insulating body 31 and abuts against the second side surface of the adjacent battery cell 21; and a first cavity 33 is formed between the first surface of the insulating body 31 and the adjacent battery cell 21; and / or a second cavity 34 is formed between the second surface of the insulating body 31 and the adjacent battery cell 21.

[0065] The internal space of the battery box 10 constitutes a receiving cavity, and a plurality of battery assemblies 20 are received in the receiving cavity of the battery box 10. Figure 2 The battery box 10 may include an upper cover 11 and a lower cover 12, which cooperate to form a receiving cavity. The upper cover 11 and the lower cover 12 may be detachably connected.

[0066] For example, the battery box 10 may serve as part of a chassis structure of a vehicle. For example, a portion of the battery box 10 may form at least a portion of the chassis of the vehicle, or a portion of the battery box 10 may form at least a portion of a cross member or a longitudinal member of the vehicle.

[0067] Illustratively, the multiple battery cells 21 involved in the present application can be connected in series, in parallel, or in a mixed connection to form a whole, and then the whole formed by the multiple battery cells 21 can be directly accommodated in the accommodation cavity of the battery case 10. In other embodiments, the multiple battery cells 21 can also be connected in series, in parallel, or in a mixed connection first, and then arranged and fixed to form a battery assembly 20, and the battery assembly 20 can be accommodated in the accommodation cavity of the battery case 10. In some other embodiments, the multiple battery cells 21 can also be connected in series, in parallel, or in a mixed connection first, and then arranged and fixed to form multiple battery assemblies 20, and the multiple battery assemblies 20 can then be connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the accommodation cavity of the battery case 10.

[0068] As an example, the plurality of battery cells 21 may be fixed by a cable tie or the like to form the battery assembly 20. As an example, the plurality of battery cells 21 may also be fixed by an end plate, a side plate or the like to form the battery assembly 20.

[0069] The battery cell 21 referred to in the embodiments of this application refers to the smallest unit that stores and outputs electrical energy. The battery cell 21 can be a secondary battery or a primary battery. The battery cell 21 can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 21 can be cylindrical, flat, rectangular, or other shapes. The battery case 10 is a structure with an internal space.

[0070] The first direction Y may be perpendicular to the second direction X. A cavity refers to a space filled with only gas and not filled with other structural components.

[0071] Combine Figure 3 It can be understood that the first side surface of the battery cell 21 is the large surface of the battery cell 21 mentioned above, and the second side surface of the battery cell 21 is the side surface of the battery cell 21 mentioned above.

[0072] The insulating member 30 is used to absorb the heat of the battery cell 21 in contact therewith and dissipate the heat to reduce the temperature of the battery cell 21. Figure 3In each battery assembly 20, an insulating member 30 is provided between the second side surfaces of each pair of adjacent battery cells 21 spaced apart along the second direction X. Thus, if thermal runaway occurs in one of the battery cells 21, the heat generated can be absorbed by the insulating member 30, thereby reducing the heat of the other battery cell 21 adjacent to the thermally runaway battery cell 21 along the first direction Y, lowering the temperature of the other battery cell 21 and, in turn, reducing the risk of thermal runaway in the other battery cell 21.

[0073] Of course, in other examples, an insulating member 30 may be provided between the second side surfaces of two adjacent battery cells 21 of each battery assembly 20 spaced apart along the second direction X. Alternatively, in a plurality of battery assemblies 20, an insulating member 30 may be provided between the second side surfaces of two adjacent battery cells 21 of some battery assemblies 20 spaced apart along the second direction X; and in some battery assemblies 20, an insulating member 30 may be provided between the second side surfaces of two adjacent battery cells 21 spaced apart along the second direction X.

[0074] The insulating body 31 can be a plate-like structure that provides electrical insulation; for example, it can be a PP (polypropylene) plate. The insulating body 31 has a first surface and a second surface along its thickness direction X, facing each other. The first surface of the insulating body 31 faces an adjacent battery cell 21 along the second direction X, while the second surface of the insulating body 31 faces another adjacent battery cell 21 along the second direction X.

[0075] As an example, the profile of the insulating body 31 may match the profile of the second side surface of the adjacent battery cell 21, and the areas of the two may be the same. As another example, Figure 3 The structure shown is fixed in the battery box 10 by an adhesive. In this example, Figure 3 The area of ​​the insulating body 31 may also be smaller than the area of ​​the second side surface of the battery cell 21, and the side of the insulating body 31 facing the bottom wall of the battery case 10 is spaced apart from the side (bottom side) of the battery cell 21 facing the bottom wall of the battery case 10. The gap between the insulating body 31 and the bottom side of the battery cell 21 can provide a certain overflow space for the adhesive. The adhesive may be glue.

[0076] As an example, combining Figure 4 , the raised structure 32 is provided on the first surface of the insulating body 31. In this example, at least one first cavity 33 is formed between the first surface of the insulating body 31 and the adjacent battery cell 21. As another example, the raised structure 32 is provided on the second surface of the insulating body 31. In this example, at least one second cavity 34 is formed between the second surface of the insulating body 31 and the second side surface of the adjacent battery cell 21. As yet another example, in combination Figure 5 The first and second surfaces of the insulating body 31 are each provided with a raised structure 32. In this example, at least one first cavity 33 is formed between the first surface of the insulating body 31 and the second side surface of an adjacent battery cell 21; and at least one second cavity 34 is formed between the second surface of the insulating body 31 and the second side surface of an adjacent battery cell 21.

[0077] For ease of description, this application defines another battery cell 21 adjacent to the battery cell 21 along the first direction Y as a large-area battery cell 21 ; and another battery adjacent to the battery cell 21 along the second direction X as a side battery cell 21 .

[0078] The battery device 200 provided in this embodiment, by disposing an insulating member 30 between at least some of the second side surfaces of two adjacent battery cells 21 in the plurality of battery assemblies 20, can further absorb heat released by the battery cells 21 through the insulating member 30 disposed on the second side surface. This reduces the amount of heat dissipated by the battery cells 21 through the first side surface, effectively reducing the amount of heat transferred to the larger battery cells 21. This lowers the temperature of the larger battery cells 21 and, in turn, reduces the risk of thermal runaway of the larger battery cells 21. Furthermore, by including an insulating body 31, the insulating member 30 electrically isolates two adjacent battery cells 21, reducing the risk of short circuits between the two adjacent battery cells 21. Furthermore, by including a raised structure 32 on the first and / or second surface of the insulating body 31 and abutting the second side surface of the adjacent battery cells 21, the insulating member 30 is in direct contact with the battery cells 21, thereby improving thermal conductivity and allowing the insulating member 30 to absorb more heat generated by thermal runaway of the battery cells 21. Furthermore, by forming a first cavity 33 between the first surface of the insulating body 31 and the adjacent battery cell 21; and / or forming a second cavity 34 between the second surface of the insulating body 31 and the adjacent battery cell 21, a certain expansion space can be provided for the battery cell 21 on the corresponding side through the first cavity 33 and / or the second cavity 34, which is beneficial to reducing the risk of failure of the battery device 200.

[0079] In one embodiment, the thermal conductivity of the insulating body 31 and / or the protruding structure 32 is greater than or equal to 0.1 W / mK. As an example, the thermal conductivity of the insulating body 31 and / or the protruding structure 32 is less than or equal to 0.3 W / mK.

[0080] Exemplarily, the thermal conductivity of at least the insulating body 31 of the insulating member 30 is greater than or equal to 0.1 W / mK; for example, the thermal conductivity of the insulating body 31 is 0.1 W / mK, 0.15 W / mK, 0.2 W / mK, 0.25 W / mK or 0.3 W / mK.

[0081] In this example, the thermal conductivity of the raised structure 32 can be greater than or equal to 0.1 W / mK to improve the thermal conductivity of the raised structure 32. Of course, the thermal conductivity of the raised structure 32 can also be less than 0.1 W / mK; for example, the raised structure 32 can be another structure with a lower thermal conductivity to meet other properties of the insulating member 30, such as elastic deformation. Of course, in other embodiments, the thermal conductivity of the raised structure 32 can also be greater than or equal to 0.1 W / mK; for example, the thermal conductivity of the raised structure 32 can be 0.1 W / mK, 0.15 W / mK, 0.2 W / mK, 0.25 W / mK, or 0.3 W / mK.

[0082] In this embodiment, by making the thermal conductivity of the insulating body 31 and / or the protruding structure 32 greater than or equal to 0.1 W / mK, the insulating member 30 can absorb more heat generated by the battery cell 21 due to thermal runaway, thereby reducing the temperature of the large-area battery cell 21 adjacent to the battery cell 21 and reducing the risk of thermal runaway of the adjacent large-area battery cell 21.

[0083] In one embodiment, the protrusion structure 32 is an elastic structure. The protrusion structure 32 made of elastic material has a certain elasticity, which can alleviate the expansion force between the battery cell 21 and the insulating member 30, thereby reducing the risk of failure of the battery device 200.

[0084] For example, the protrusion structure 32 is a microcellular polypropylene foam (MPP) structure. Of course, the protrusion structure 32 can also be a hard rubber structure.

[0085] In one embodiment, see Figures 6 and 7 , Figure 6 A schematic diagram of the positions of multiple battery assemblies 20 and a cold plate 40 provided in one embodiment of the present application; Figure 7 Provided for an embodiment of this application Figure 6 The battery device 200 further includes a plurality of cold plates 40, one cold plate 40 being provided on both sides of each battery cell 21 along the first direction Y, with portions of the cold plates 40 being disposed in contact with adjacent battery cells 21. Portions of the cold plates 40 are spaced apart from adjacent battery cells 21 to form a third cavity 41. The insulating member 30 is disposed between the second side surfaces of each two adjacent battery cells 21.

[0086] A cold plate 40 is disposed between every two adjacent battery cells 21 along the first direction Y; that is, a cold plate 40 is disposed between the first side surfaces of every two adjacent battery cells 21. The cold plate 40 partially contacts two adjacent battery cells 21 along the first direction Y to reduce heat generation within the battery cells 21.

[0087] The plurality of cold plates 40 along the second direction X may be arranged at intervals or connected in sequence to form a whole.

[0088] As an example, the cold plate 40 may be provided with a liquid-conducting channel through which coolant can flow to remove heat from the battery cells 21 in contact with the cold plate 40, thereby improving the heat dissipation efficiency of the battery cells 21. The liquid-conducting channels on all cold plates 40 may be interconnected and connected to the liquid inlet and outlet, respectively; alternatively, the liquid-conducting channels on some of the cold plates 40 may be interconnected and connected to the liquid inlet and outlet, respectively; or the liquid-conducting channels on some of the cold plates 40 may have their ends directly connected to the liquid inlet and outlet, respectively.

[0089] Of course, in other examples, multiple air ducts or cooling structures may be provided in the cold plate 40 to remove heat from the battery cells 21 .

[0090] In one example, see Figure 7 The cross-sectional view of the cold plate 40 along the BB direction can be an I-shaped structure, so as to cooperate with two battery cells 21 adjacent to each other along the first direction Y to form a third cavity 41, thereby providing a certain expansion space for the thermal expansion of the battery cells 21 along the first direction Y, thereby reducing the risk of failure of the battery device 200.

[0091] Of course, in other examples, the cross-sectional view of the cold plate 40 along the BB direction may also be a V-shaped structure, or other irregular structures, to increase the contact area between the cold plate 40 and the battery cells 21 and improve the heat dissipation efficiency of the cold plate 40 .

[0092] In one example, an insulating member 30 is provided between the second side surfaces of every two battery cells 21 .

[0093] In this embodiment, by providing a cold plate 40 on either side of each battery cell 21 along the first direction Y, and by aligning portions of the cold plate 40 with adjacent battery cells 21, the cold plate 40 can be further utilized to dissipate heat from the battery cells 21, thereby further reducing the amount of heat transferred from the battery cells 21 to the adjacent large-area battery cells 21, thereby reducing the risk of thermal runaway of the large-area battery cells 21. Furthermore, aligning the cold plate 40 with the battery cells 21 can increase heat conduction efficiency. Furthermore, by spacing portions of the cold plate 40 from adjacent battery cells 21 to form a third cavity 41, a sufficient amount of expansion space can be provided for thermal expansion of the battery cells 21 along the first direction Y, effectively reducing the risk of failure of the battery device 200.

[0094] Of course, in other embodiments, the insulating member 30 is arranged between the second side surfaces of each two adjacent battery cells 21; the two battery cells 21 adjacent along the first direction Y can be arranged in a close fit, or a thermal insulation pad or a frame structure is provided between the two; without changing the structure corresponding to the first side surface of the battery cell 21, the thermal insulation pad between the second side surfaces of the battery cell 21 is replaced with the insulating member 30 of the present application to improve the heat dissipation capacity of the second side surface of the battery cell 21, thereby reducing the heat dissipated by the first side surface of the battery cell 21, so as to reduce the temperature of the other battery cell 21 adjacent to the first side surface of the battery cell 21, thereby reducing the risk of thermal runaway of the other battery cell 21.

[0095] In one embodiment, see Figure 8 , Figure 8 This is a main view of the insulating part 30 provided in the first embodiment of the present application; the protrusion structure 32 includes two first protrusions 35, the first protrusions 35 extend along the length direction Z of the insulating body 31, and the two first protrusions 35 are arranged on both side edges of the insulating body 31 along the width direction Y of the insulating body 31.

[0096] The cross-sectional view of the insulating member 30 corresponding to this embodiment at any position along the length direction Z along the CC direction is: Figure 4 The structure of the insulating member 30 shown; or Figure 5 The structure of the insulating member 30 is shown. The first protrusion 35 can be fixed to the insulating body 31 by gluing. When the protrusion structure 32 and the insulating body 31 are made of the same material, the protrusion structure 32 can be integrally formed with the insulating body 31 to increase the connection strength between the two.

[0097] It should be noted that, combined with Figure 6 and Figure 8The length direction Z of the insulating body 31 is parallel to the height direction Z of the battery cell 21; the width direction Y of the insulating body 31 is parallel to the first direction Y; and the thickness direction X of the insulating body 31 is parallel to the second direction X.

[0098] In this embodiment, heat generated by thermal runaway of the battery cell 21 is conducted to the insulating body 31 via the two first protrusions 35 for dissipation. Furthermore, the first cavity 33 and / or the second cavity 34 are open at both ends along the length direction Z of the insulating body 31 to allow airflow to pass through. This allows the first cavity 33 and / or the second cavity 34 to double as cooling ducts. The airflow passing through the first cavity 33 and / or the second cavity 34 further removes some of the heat from the battery cell 21, thereby further reducing the heat of the battery cell 21 and, in turn, the risk of thermal runaway of the adjacent large-surface battery cell 21. Furthermore, this embodiment allows the first cavity 33 and / or the second cavity 34 to be sufficiently large to provide ample room for thermal expansion of the battery cell 21.

[0099] In one embodiment, see Figure 9a , Figure 9a This is a main view of the insulating member 30 provided in the second embodiment of the present application; in addition to the first protrusion 35, the protrusion structure 32 further includes a plurality of second protrusions 36, and the second protrusions 36 extend along the width direction Y of the insulating body 31 and are arranged at least on both side edges of the insulating body 31 along the length direction Z of the insulating body 31.

[0100] The connection method between the second protrusion 36 and the insulating body 31 is similar to the connection method between the first protrusion 35 and the insulating body 31 .

[0101] As an example, the protruding structure 32 includes two second protruding portions 36 , and the two second protruding portions 36 are provided at two side edges of the insulating body 31 along the length direction Z of the insulating body 31 .

[0102] In this example, the second protrusions 36 may be spaced apart from the two first protrusions 35 along the width direction Y of the insulating body 31. It is understood that if the two first protrusions 35 and the two second protrusions 36 are connected end to end, wrinkles may easily form on the first protrusions 35 and / or the second protrusions 36 during the process of attaching the first protrusions 35 and the second protrusions 36 to the insulating body 31, resulting in portions of the first protrusions 35 and / or the second protrusions 36 being unable to contact the battery cells 21, thereby preventing effective heat conduction. In the above-mentioned solution of the present application, the second protrusion 36 is spaced apart from the first protrusion 35. In this way, in the process of arranging the first protrusion 35 and the second protrusion 36 on the insulating body 31, the first protrusion 35 and the second protrusion 36 can be arranged separately. The length of the protrusion arranged each time is relatively small, and each protrusion does not need to bend, which reduces the risk of wrinkles on the first protrusion 35 and / or the second protrusion 36. It is convenient to arrange the first protrusion 35 and the second protrusion 36 flatly on the insulating body 31, which is beneficial for each position of the first protrusion 35 and each position of the second protrusion 36 to contact the battery cell 21 respectively, thereby improving the thermal conductivity efficiency.

[0103] In this embodiment, the risk of the middle region of the insulating body 31 along its width direction Y being in contact with the battery cell 21, preventing the formation of the first cavity 33 and / or the second cavity 34, or causing the first cavity 33 and / or the second cavity 34 to be too small, can be reduced. Furthermore, the contact area between the insulating member 30 and the battery cell 21 can be increased, thereby improving heat dissipation efficiency. The middle region of the insulating body 31 along its width direction Y refers to the region located at or near the centerline of the insulating body 31 along its width direction Y.

[0104] Of course, in other embodiments, see Figure 9b , Figure 9b This is a front view of the insulating member 30 provided in the third embodiment of the present application; Figure 9a The difference between the corresponding embodiment is that the protrusion structure 32 includes multiple second protrusions 36 but does not include the first protrusion 35. In this way, a cooling air duct can be formed between two adjacent battery cells 21, so that the airflow through the cooling air duct removes some heat, thereby reducing the risk of thermal runaway of the battery cells 21.

[0105] In one embodiment, see Figure 10 , Figure 10 This is a front view of the insulating member 30 provided in the fourth embodiment of the present application; at least one second protrusion 36 is also provided in the middle area of ​​the insulating body 31 along the length direction Z thereof.

[0106] The middle area of ​​the insulating body 31 along the length direction Z thereof refers to an area where the center line of the insulating body 31 along the length direction Z thereof is located or an area close to the center line.

[0107] As an example, the insulating body 31 is also provided with a plurality of second protrusions 36 in the middle area along its length direction Z. The plurality of second protrusions 36 are distributed at intervals in the middle area of ​​the insulating body 31 along its length direction Z, and each second protrusion 36 can be spaced apart from the first protrusion 35, so as to facilitate setting the second protrusion 36 at a preset position of the insulating body 31 according to actual needs.

[0108] The number of the second protrusions 36 can be set according to the actual size of the insulating body 31 along its length direction Z, as long as each position of the insulating body 31 maintains a certain distance from the adjacent battery cell 21 to form the first cavity 33 or the second cavity 34.

[0109] As an example, see Figure 11 , Figure 11 for Figure 3 The insulating member 30 is Figure 10 The structure of the insulating member 30 provided between the second side surfaces of two adjacent battery cells 21 is shown in a DD-axis cross-sectional view. Figure 10 As shown, in this example, the first surface of the insulating body 31 can cooperate with the battery cells 21 on the corresponding side to form multiple first cavities 33; and the second surface of the insulating body 31 can cooperate with the battery cells 21 on the corresponding side to form multiple second cavities 34.

[0110] As another example, see Figure 12 , Figure 12 for Figure 3 The insulating member 30 is Figure 10 Another DD-direction cross-sectional diagram of the structure corresponding to the insulating member 30 shown; the structure of the insulating member 30 provided between the second side surfaces of two adjacent battery cells 21 is as shown in FIG. Figure 10 As shown, in this example, the first surface of the insulating body 31 can cooperate with the battery cells 21 on the corresponding side to form multiple first cavities 33; or, the second surface of the insulating body 31 can cooperate with the battery cells 21 on the corresponding side to form multiple second cavities 34.

[0111] In this embodiment, by also providing at least one second protrusion 36 in the middle region of the insulating body 31 along its length direction Z, the risk of the middle region of the insulating body 31 along its length direction Z abutting against the second side surface of the battery cell 21, thereby preventing the formation of the first cavity 33 and / or the second cavity 34, or resulting in a small space for the first cavity 33 and / or the second cavity 34, can be reduced when the insulating member 30 is relatively large along its length direction Z. Furthermore, the contact area between the insulating member 30 and the battery cell 21 can be further increased, thereby further improving the heat dissipation efficiency of the battery cell 21 and reducing the risk of thermal runaway of adjacent battery cells 21.

[0112] In one embodiment, see Figure 10 and Figure 13 , Figure 13 This is a front view of an insulating member 30 provided in the fifth embodiment of the present application; the first raised portion 35 includes a first rib 351 and / or a plurality of first protrusions 352; the first rib 351 extends along the length direction Z of the insulating body 31; the plurality of first protrusions 352 are spaced apart along the length direction Z of the insulating body 31; the second raised portion 36 includes a second rib 361 and / or a plurality of second protrusions 362; the second rib 361 extends along the width direction Y of the insulating body 31; the plurality of second protrusions 362 are spaced apart along the width direction Y of the insulating body 31.

[0113] The cross-section of the rib along the thickness direction X of the insulating body 31 at each location along its extension direction can be rectangular to increase the contact area between the rib and the battery cell 21. The cross-section of the bump along the thickness direction X of the insulating body 31 can also be rectangular to increase the contact area between the bump and the battery cell 21.

[0114] It can be understood that the ribs are in the shape of long strips, and the bumps are in the shape of dots or blocks. The dimension of the ribs along their extension direction is greater than the length and width of the bumps.

[0115] As an example, the first raised portion 35 includes a first rib 351, and the second raised portion 36 includes a second rib 361. As another example, the first raised portion 35 includes a first bump 352, and the second raised portion 36 includes a second bump 362. As yet another example, the first raised portion 35 includes a first rib 351 and a plurality of first bumps 352, with the first rib 351 and the plurality of first bumps 352 spaced apart. The second raised portion 36 includes a second rib 361 and a plurality of second bumps 362, with the second rib 361 and the plurality of second bumps 362 spaced apart. Alternatively, one of the first and second raised portions 35, 36 includes a rib, and the other includes a plurality of bumps; or one of the first and second raised portions 35, 36 includes a rib and a plurality of bumps, and the other includes a plurality of bumps or a rib.

[0116] In this embodiment, by providing the raised portion with continuously distributed ribs, the contact area between the raised portion and the battery cell 21 can be increased, thereby improving heat conduction efficiency and more quickly reducing the heat generated by thermal runaway of the battery cell 21. Furthermore, by providing the raised portion with a plurality of spaced-apart bumps, while the bumps are utilized for heat conduction, the gaps between adjacent bumps can also form expansion space for the battery cell 21, thereby reducing the risk of failure of the battery device 200. These gaps can also be utilized to form cooling air ducts, allowing some airflow to flow through the gaps and remove some heat from the battery cell 21, further improving heat dissipation efficiency.

[0117] In one embodiment, the thickness of the insulating body 31 is greater than or equal to 0.05 mm and less than or equal to 2 mm; and / or the thickness of the protruding structure 32 is greater than or equal to 0.05 mm and less than or equal to 4 mm. Figure 12 In the illustrated aspect, the thickness of the insulating body 31 refers to the dimension of the insulating body 31 along the second direction X.

[0118] For example, the thickness of the insulating body 31 can be 0.05mm, 0.1mm, 0.5mm, 1.0mm, 1.5mm, or 2mm, etc. The thickness of the raised structure 32 can be 0.05mm, 0.1mm, 0.5mm, 1.0mm, 2.0mm, 3.0mm, or 4.0mm, etc. The thickness of the raised structure 32 can be designed based on the spacing between two adjacent battery cells 21, whether the raised structure 32 is provided on one side of the insulating body 31, or whether the raised structure 32 is provided on both sides of the insulating body 31. As long as the insulating member 30 is provided between two adjacent battery cells 21, the insulating member 30 abuts against the battery cells 21 on both sides along the thickness direction X.

[0119] As an example, the spacing between two adjacent battery cells 21 along the second direction X is 2 mm. In this example, the thickness of the insulating body 31 is greater than or equal to 0.4 mm and less than or equal to 0.6 mm; the thickness of the raised structure 32 is greater than or equal to 0.7 mm and less than or equal to 1.6 mm. For example, the thickness of the insulating body 31 is 0.5 mm, and the raised structure 32 is provided on the first and second surfaces of the insulating body 31. In this case, the thickness of the raised structure 32 is 0.75 mm.

[0120] In this embodiment, the insulating member 30 of the present application can be positioned between two adjacent battery cells 21 while maintaining the original spacing between the battery cells 21, thereby improving the heat dissipation capability of the second side surfaces of the battery cells 21. Furthermore, the use of a thinner insulating body 31 can increase the heat dissipation capability of the insulating member 30 and allow a cavity to be formed between the first and / or second surfaces of the insulating body 31 and adjacent battery cells 21, providing sufficient space for expansion of the battery cells 21.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery box; A plurality of battery assemblies are disposed in the battery case and arranged along a first direction, each of the battery assemblies including a plurality of battery cells arranged along a second direction; the first direction intersects the second direction; the battery cells have two first side surfaces facing each other along the first direction and two second side surfaces facing each other along the second direction; the first side surface has an area greater than the second side surface; An insulating member is provided between the second side surfaces of at least some of the adjacent two battery cells in the multiple battery assemblies; and the insulating member includes an insulating body and a protruding structure; the insulating body has a first surface and a second surface opposite to each other; the protruding structure is provided on the first surface and / or the second surface and abuts against the second side surface of the adjacent battery cell; and a first cavity is formed between the first surface of the insulating body and the adjacent battery cell; and / or a second cavity is formed between the second surface and the adjacent battery cell.

2. The battery device according to claim 1, wherein: The thermal conductivity of the insulating body and / or the protruding structure is greater than or equal to 0.1 W / mK.

3. The battery device according to claim 1 or 2, characterized in that The protruding structure is an elastic structure.

4. The battery device according to claim 1, wherein: Also includes: a plurality of cold plates, one cold plate being provided on each of the battery cells on both sides along the first direction, with portions of the cold plates being arranged in contact with adjacent battery cells; and portions of the cold plates being spaced apart from adjacent battery cells to form a third cavity; Wherein, the insulating member is arranged between the second side surfaces of every two adjacent battery cells.

5. The battery device according to claim 1, wherein: The protrusion structure includes two first protrusions, which extend along the length direction of the insulating body. The two first protrusions are arranged on both side edges of the insulating body along the width direction of the insulating body.

6. The battery device according to claim 5, characterized in that The protrusion structure further includes a plurality of second protrusions, which extend along the width direction of the insulating body and are arranged at least on two side edges of the insulating body along the length direction of the insulating body.

7. The battery device according to claim 6, characterized in that The insulating body is also provided with at least one second protrusion in the middle region along the length direction thereof.

8. The battery device according to claim 6, wherein: The first protrusion includes a first rib and / or a plurality of first protrusions; the first rib extends along the length direction of the insulating body; the plurality of first protrusions are arranged at intervals along the length direction of the insulating body; The second protrusion includes a second rib and / or a plurality of second bumps; the second rib extends along the width direction of the insulating body; and the plurality of second bumps are arranged at intervals along the width direction of the insulating body.

9. The battery device according to claim 1, wherein: The thickness of the insulating body is greater than or equal to 0.05 mm and less than or equal to 2 mm; and / or The thickness of the protruding structure is greater than or equal to 0.05 mm and less than or equal to 4 mm.

10. An electrical device, characterized in that: The invention comprises a battery device according to any one of claims 1 to 9.

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