Battery device and electric device

Abstract

This application discloses a battery device and an electrical device, belonging to the field of battery technology. The battery device includes a battery cell assembly and a housing. The battery cell assembly includes multiple battery cells, a first end plate, and a second end plate. The first end plate and the second end plate are spaced apart along a first direction, and the multiple battery cells are disposed between the first end plate and the second end plate. The housing is used to house the battery cell assembly and has a bearing surface for supporting the battery cells. The first end plate includes a first end close to the bearing surface and a second end away from the bearing surface, with the first end connected to the housing. The housing also includes a first beam located along the first direction on the side of the first end plate opposite to the battery cells. The battery cell assembly also includes a support member, at least a portion of which is located between the first beam and the first end plate. The above-described battery device has high reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery device and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Improving the reliability of battery devices is a pressing issue in battery technology. Summary of the Invention

[0004] In view of the above problems, this application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] In a first aspect, this application provides a battery device, comprising a battery cell assembly and a housing. The battery cell assembly includes a plurality of battery cells, a first end plate, and a second end plate, which are spaced apart along a first direction. The plurality of battery cells are disposed between the first end plate and the second end plate. The housing is used to house the battery cell assembly and has a bearing surface for supporting the battery cells. The first end plate includes a first end near the bearing surface and a second end away from the bearing surface, with the first end connected to the housing. The housing also includes a first beam located along the first direction on the side of the first end plate opposite to the battery cells. The battery cell assembly further includes a support member, at least a portion of which is located between the first beam and the first end plate.

[0006] In the technical solution of this application embodiment, since at least a portion of the support member is located between the first beam and the first end plate, a mechanical transmission path is formed between the first beam and the first end plate. When a battery cell expands, the resulting expansion force can be transmitted to the first beam through the support member, thereby fully utilizing the structural rigidity of the housing itself to share the expansion force and reducing the risk of damage to the first end plate due to excessive expansion force. Furthermore, the support member also controls the displacement of the second end within a reasonable range, ensuring high structural stability of the battery cell assembly. This, in turn, improves the reliability of the battery device.

[0007] In one or more embodiments of the first aspect, the support member is connected to the first end plate.

[0008] In the above solution, connecting the support member to the first end plate further improves the bending strength of the first end plate and reduces the risk of local deformation. Furthermore, when the first end plate shifts, the support member can shift synchronously with it, reducing the risk of shear stress concentration caused by a displacement difference between the support member and the first end plate. This further improves the reliability of the first end plate.

[0009] In one or more embodiments of the first aspect, the support member is disposed between the second end and the first beam.

[0010] In the above scheme, since the first end is connected to the housing and the second end is not directly connected to the housing, placing the support between the second end and the first beam can significantly reduce the risk of structural instability caused by excessive displacement at the second end due to the expansion of the battery cells, which would reduce the constraint force of multiple battery cells. This is beneficial for ensuring that the battery cell assembly has high structural stability.

[0011] In one or more embodiments of the first aspect, the support member is integrally formed with the first end plate.

[0012] In the above solution, by integrally molding the support member and the first end plate, the connection interface between the support member and the first end plate can be eliminated, reducing the risk of stress concentration at the connection interface when the battery cell expands, and improving the reliability of the first end plate. Furthermore, it can reduce assembly steps and improve the production efficiency of the battery device. Simultaneously, it can also reduce the risk of the support member wearing down the first end plate due to vibration of the battery device caused by the connection interface.

[0013] In one or more embodiments of the first aspect, from the second end to the first end, the size of the support member protruding from the first end plate in the first direction gradually decreases.

[0014] In the above scheme, the first end is connected to the casing, while the second end is not directly connected. When the battery cell expands, the displacement of the second end is greater than that of the first end. By designing the support member to protrude from the first end plate in a gradually decreasing direction from the second end to the first end, the risk of excessive deformation in areas with large displacement can be effectively reduced, and the risk of local stress concentration caused by excessive constraint can be reduced in areas with small displacement.

[0015] In one or more embodiments of the first aspect, the support member is separately formed from the first end plate, and the support member is connected to the first end plate.

[0016] In the above scheme, since the support component and the first end plate are formed separately, the cost of manufacturing the support component and the first end plate by means of separate forming is lower.

[0017] In one or more embodiments of the first aspect, the first end plate has a first end face away from the bearing surface; the support member includes a support portion and a connecting portion connected to each other, the connecting portion is disposed on the first end face and connected to the first end plate, and the support portion is located between the first beam and the first end plate along the first direction.

[0018] In the above scheme, since the first end face is away from the bearing surface, the first end face has a relatively large assembly space, which can reduce the assembly difficulty of the support component.

[0019] In one or more embodiments of the first aspect, the connecting portion is connected to the first end plate by a first fastener.

[0020] In the above solution, since the connecting part is connected to the first end plate through the first fastener, the support can be replaced independently without the need to replace the end plate at the same time, which can reduce the maintenance cost of the battery device.

[0021] In one or more embodiments of the first aspect, the support member is spaced apart from the first beam along the first direction; or, the support member abuts against the first beam.

[0022] In the above scheme, when the support member and the first beam are spaced apart along the first direction, the risk of stress concentration at the connection interface between the support member and the first beam after assembly can be reduced. When the support member and the first beam abut against each other, the expansion force can be transmitted to the first beam more quickly, allowing the first beam to share the expansion force in a timely manner.

[0023] In one or more embodiments of the first aspect, both the support member and the first end plate are metal parts.

[0024] In the above scheme, since both the support component and the first end plate are metal components, both the support component and the first end plate have high structural strength, which is beneficial to enable the battery cell assembly to have high structural stability.

[0025] In one or more embodiments of the first aspect, the support member is made of aluminum alloy, and the first end plate is made of aluminum alloy.

[0026] In the above scheme, since the support component is made of aluminum alloy and the first end plate is made of aluminum alloy, both the support component and the first end plate have a light weight, which is beneficial to enable the battery device to have a high energy density.

[0027] In one or more embodiments of the first aspect, the battery cell assembly further includes a first binding member and a second binding member, both of which are used to bind the first end plate, the second end plate, and multiple battery cells. The first binding member and the second binding member are spaced apart along a second direction, which is perpendicular to the bearing surface. The first binding member is closer to the bearing surface than the second binding member, and the tensile strength of the second binding member is greater than the tensile strength of the first binding member.

[0028] In the above scheme, the bundling components can bind multiple battery cells between the first and second end plates, thus arranging them orderly inside the housing and improving the space utilization of the housing, which is beneficial for increasing the energy density of the battery pack. Simultaneously, the support components reduce the risk of the bundling components breaking due to excessive expansion force, thereby giving the battery cell assembly higher structural stability. Furthermore, since the first end is connected to the housing, but the second end is not directly connected, placing the second bundling component, which has higher tensile strength, near the second end reduces the risk of bundling component failure due to excessive displacement at the second end, thereby reducing the risk of structural instability of multiple battery cells. This contributes to the high structural stability of the battery cell assembly.

[0029] In one or more embodiments of the first aspect, the second strapping member is made of metal, and the first strapping member is made of plastic.

[0030] In the above solution, the second binding element is made of metal, while the first binding element is made of plastic. This design not only ensures high structural stability of the battery cell assembly but also reduces the manufacturing cost of the battery device.

[0031] In one or more embodiments of the first aspect, multiple battery cells between the first end plate and the second end plate are arranged in multiple columns, with each column of battery cells arranged along a first direction. Multiple second binding members are provided, each corresponding to one column of battery cells, and each second binding member is used to bind the corresponding column of battery cells.

[0032] In the above scheme, when the battery cell assembly includes multiple rows of battery cells, each second binding member is used to bind the corresponding row of battery cells, which can make each row of battery cells have high structural stability, thereby making the battery cell assembly have high structural stability.

[0033] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the third direction, the orthographic projections of two adjacent second binding members do not overlap, and the third direction, the second direction, and the first direction are perpendicular to each other.

[0034] In the above scheme, since the orthographic projections of two adjacent second strapping members do not overlap in the same projection plane perpendicular to the third direction, the risk of contact wear and failure of the two second strapping members in the third direction can be reduced.

[0035] In one or more embodiments of the first aspect, the orthographic projection portions of two adjacent second strapping members overlap on the same projection plane perpendicular to the second direction.

[0036] In the above scheme, since the orthographic projections of two adjacent second bundles overlap on the same projection plane perpendicular to the second direction, the two adjacent second bundles can share a portion of the space, which is beneficial to improving the energy density of the battery device.

[0037] In one or more embodiments of the first aspect, the first end plate is provided with a groove, and a portion of each of two adjacent second binding members is disposed in the same groove.

[0038] In the above scheme, two adjacent second binding components are accommodated in the same groove, which allows the assembly of the two second binding components to be completed while the first end plate has high structural strength.

[0039] In one or more embodiments of the first aspect, the battery cell assembly further includes a side plate disposed on one side of the plurality of battery cells in a third direction, the third direction being perpendicular to the first direction, and both the third direction and the first direction being parallel to the bearing surface; the side plate connects the first end plate and the second end plate. Along the second direction, the side plate is located between the first and second strapping members.

[0040] In the above scheme, since the side plate is connected to the first end plate and the second end plate, the side plate can reduce the risk of structural instability of multiple battery cells due to excessive displacement of the first and second end plates when the battery cell expands. Furthermore, the side plate's location between the first and second binding members reduces the risk of interference between the side plate and the first and second binding members during assembly.

[0041] In one or more embodiments of the first aspect, the battery cell assembly further includes a heat insulation pad and a first buffer pad disposed at a distance along a first direction, the heat insulation pad being disposed between two adjacent battery cells, and the first buffer pad being disposed between two adjacent battery cells; the compressive strength of the heat insulation pad is greater than the compressive strength of the first buffer pad.

[0042] In the above solution, since the heat insulation pad and the first buffer pad are spaced apart along the first direction, and the heat insulation pad is disposed between two adjacent battery cells, while the first buffer pad is disposed between two adjacent battery cells, the battery cell assembly can simultaneously provide buffering and heat insulation capabilities, thus achieving higher reliability. Furthermore, because the compressive strength of the heat insulation pad is greater than that of the first buffer pad, compared to distributing a heat insulation pad between every two adjacent battery cells, the overall size along the first direction after assembling multiple battery cells can be designed to be smaller, which is beneficial for improving the energy density of the battery device.

[0043] In one or more embodiments of the first aspect, a plurality of heat insulation pads are provided, a plurality of first buffer pads are provided, and the plurality of heat insulation pads and the plurality of buffer pads are alternately arranged along a first direction.

[0044] In the above scheme, when the battery cell expands, multiple heat insulation pads and multiple buffer pads are alternately arranged along the first direction, which can make the overall stress of the battery cell assembly more uniform and help the battery cell assembly to have higher structural stability.

[0045] In one or more embodiments of the first aspect, the plurality of battery cells include a first battery cell and a second battery cell disposed adjacent to each other along a third direction, the third direction being perpendicular to the first direction, and both the third direction and the first direction being parallel to the bearing surface. A second buffer pad is disposed between the first battery cell and the second battery cell along the third direction.

[0046] In the above scheme, the second buffer pad can absorb the stress of the first and second battery cells in the third direction, which is beneficial to improving the structural stability of the battery cell assembly.

[0047] In one or more embodiments of the first aspect, the battery cell closest to the first end plate among the plurality of battery cells is the first end battery cell; the battery cell assembly further includes an insulating member and a third buffer pad, wherein at least a portion of the insulating member is located between the first end battery cell and the first end plate along the first direction, and the third buffer pad is disposed between the insulating member and the first end plate.

[0048] In the above scheme, the installation of insulating components can reduce the risk of short circuit between the first end battery cell and the first end plate. The installation of the third buffer pad can create a controllable energy absorption zone between the first end battery cell and the first end plate, which is beneficial to improving the reliability of the battery device.

[0049] In one or more embodiments of the first aspect, the first end plate has a first end face away from the bearing surface and a second end face facing the bearing surface, the first end plate has a first through hole, the first through hole penetrates the first end face and the second end face along a second direction, the second direction being perpendicular to the bearing surface; the battery cell assembly further includes a first fastener, the first fastener is disposed in the first through hole, and one end of the first fastener extending out of the second end face is connected to the housing.

[0050] In the above solution, since the first fastener passes through the first through hole along the second direction, penetrating both the first and second end faces, and the end of the first fastener extending beyond the second end face is connected to the housing, at least a portion of the support member is located between the first beam and the first end plate. This creates a mechanical transmission path between the first beam and the first end plate. When a battery cell expands, the resulting expansion force can be transmitted to the first beam through the support member, thus fully utilizing the structural rigidity of the housing to distribute the expansion force. Furthermore, this reduces the risk of excessive expansion force causing the first fastener connection to fail, and also reduces the risk of stress concentration between the first fastener and the first end plate leading to excessive deformation of the first end plate.

[0051] In one or more embodiments of the first aspect, a plurality of first fasteners are provided, and the plurality of first fasteners are spaced apart along a third direction, wherein the third direction, the second direction and the first direction are perpendicular to each other.

[0052] In the above solution, multiple first fasteners can further improve the connection stability between the first end plate and the housing. Furthermore, this reduces the risk of structural instability of multiple battery cells due to excessive displacement of the first end plate when the battery cells expand.

[0053] In one or more embodiments of the first aspect, the battery cell is a square battery cell, and the surface of the battery cell in the first direction is the surface with the largest area in the battery cell.

[0054] In the above scheme, when the battery cell expands, the surface with the largest area in the battery cell expands by a larger amount. By placing at least a portion of the support member between the first beam and the first end plate along the first direction, the risk of damage due to excessive expansion force on the first end plate can be significantly reduced.

[0055] Secondly, this application provides an electrical device that includes the battery device described in one or more of the above embodiments, the battery device being used to provide electrical energy.

[0056] In the above solutions, since the battery device in one or more of the above embodiments has high reliability, the power supply device including the battery device in one or more of the above embodiments also has high reliability.

[0057] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0058] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0059] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0060] Figure 2 Exploded views of battery devices according to some embodiments of this application;

[0061] Figure 3 This is a schematic diagram of a portion of the structure of a battery device according to some embodiments of this application;

[0062] Figure 4 Here are exploded views of battery cell assemblies according to some embodiments of this application;

[0063] Figure 5 For this application Figure 3 A magnified view of a section at point A in the middle;

[0064] Figure 6 This is a schematic diagram of the structure of the first end plate in some embodiments of this application;

[0065] Figure 7 This is a schematic diagram of the structure of the first end plate in some embodiments of this application;

[0066] Figure 8 This is a schematic diagram of the structure of the support member according to some embodiments of this application;

[0067] Figure 9 This is a cross-sectional view of a partial structure of a battery cell assembly according to some embodiments of this application;

[0068] Figure 10 For this application Figure 9 A magnified view of a section at point B in the middle;

[0069] Figure 11 This is a schematic diagram of the structure of the heat insulation pad according to some embodiments of this application;

[0070] Figure 12 This is a schematic diagram of the structure of the first buffer pad in some embodiments of this application;

[0071] Figure 13 This is a schematic diagram of the structure of the second buffer pad in some embodiments of this application;

[0072] Figure 14 This is a schematic diagram of the side plate structure of some embodiments of this application;

[0073] Figure 15 This is a schematic diagram of the structure of an insulating component according to some embodiments of this application.

[0074] The reference numerals in the detailed embodiments are as follows:

[0075] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Housing; 111 - First Housing; 112 - Second Housing; 113 - Frame; 114 - Load-bearing Surface; 115 - First End; 116 - Second End; 117 - First Beam; 118 - Second Beam; 119 - Support Member; 1191 - Support Part; 1192 - Connecting Part; 12 - Battery Cell Assembly; 121 - Battery Cell; 1211 - First Battery Cell; 1212 - Second Battery Cell; 122 - First End Plate; 1221 - First End Face; 1222 - Second End Face; 12 23-First through hole; 1224-Limiting part; 123-Second end plate; 124-First fastener; 125-Binding piece; 126-First binding piece; 127-Second binding piece; 128-Groove; 129-Heat insulation pad; 130-First buffer pad; 1301-First buffer part; 1302-Second buffer part; 131-Second buffer pad; 132-Side plate; 133-Insulating part; 1331-Body part; 1332-First flange part; 1333-Second flange part; 134-Bearing plate; 135-Second fastener; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0076] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0077] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0078] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0079] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0080] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0081] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0082] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0083] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0084] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0085] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0086] In some implementations, the electrode assembly is a stacked structure.

[0087] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0088] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0089] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0090] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0091] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0092] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0093] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0094] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0095] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0096] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0097] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0098] In a typical battery cell structure, a battery cell includes a casing, electrode assemblies, and electrolyte. The casing includes end caps and a housing; the end caps close the opening of the housing to define a space for accommodating the electrode assemblies. In some embodiments, the casing can be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc.

[0099] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, the reliability of the battery device also needs to be considered.

[0100] A typical battery assembly includes a housing to house individual battery cells. Each battery cell assembly generally consists of two end plates and multiple individual cells positioned between them. Since one end of each end plate is connected to the housing, while the other end is not, the end plates may be damaged due to excessive expansion forces when a battery cell expands. Furthermore, the end of the end plate not connected to the housing may experience significant displacement, potentially causing multiple battery cells to detach from the end plate and leading to structural instability. This could manifest as connection failure between battery cells and the busbar, or even breakage of the tabs. Therefore, the reliability of such battery assemblies is relatively poor.

[0101] In view of this, this application provides a battery device, which includes a battery cell assembly and a housing. The battery cell assembly includes multiple battery cells, a first end plate, and a second end plate. The first end plate and the second end plate are spaced apart along a first direction, and the multiple battery cells are disposed between the first end plate and the second end plate. The housing is used to house the battery cell assembly and has a bearing surface for supporting the battery cells. The first end plate includes a first end close to the bearing surface and a second end away from the bearing surface, with the first end connected to the housing. The housing also includes a first beam located along the first direction on the side of the first end plate away from the battery cells. The battery cell assembly also includes a support member, at least a portion of which is located between the first beam and the first end plate. Because at least a portion of the support member is located between the first beam and the first end plate, a mechanical transmission path is formed between the first beam and the first end plate. When a battery cell expands, the resulting expansion force can be transmitted to the first beam through the support member, thereby fully utilizing the structural rigidity of the housing to distribute the expansion force and reducing the risk of damage to the first end plate due to excessive expansion force. Furthermore, the design of the support components can control the displacement of the second end within a reasonable range, thereby ensuring high structural stability of the battery cell assembly and improving the reliability of the battery device.

[0102] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0103] Electrical devices include, but are not limited to: electric vehicles, electric cars, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0104] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0105] For example, Figure 1This is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 may have a motor 300, a controller 200, and a battery device 100 installed inside. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000.

[0106] To meet different power demands, the battery device 100 may include multiple battery cells 121, which can be connected in series, parallel, or a combination of both. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 121 can first be connected in series, parallel, or a combination of both to form a battery cell assembly 12, and then the battery cell assemblies 12 can be connected in series, parallel, or a combination of both to form the battery device 100. In other words, the multiple battery cells 121 can directly form the battery device 100, or they can first be assembled into battery cell assemblies 12, and then the battery cell assemblies 12 can be assembled into the battery device 100.

[0107] For example, please refer to Figure 2 , Figure 2 The exploded view of a battery device 100 according to some embodiments of this application shows that the battery device 100 may include a plurality of battery cells 121. The battery device 100 may also include a housing 11, which has a hollow interior structure, housing the plurality of battery cells 121. As shown in the figure, these are referred to here as a first housing 111 and a second housing 112, which are fastened together. The shapes of the first housing 111 and the second housing 112 can be determined according to the combined shape of the plurality of battery cells 121. Both the first housing 111 and the second housing 112 may have an open surface. For example, both the first housing 111 and the second housing 112 may be hollow cuboids with only one open surface each. The open surfaces of the first housing 111 and the second housing 112 are opposite to each other, and the first housing 111 and the second housing 112 are fastened together to form a housing 11 with a closed cavity. Multiple battery cells 121 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the first housing 111 and the second housing 112 being fastened together.

[0108] Optionally, the battery device 100 may also include other structures, which will not be described in detail here. For example, the battery device 100 may also include a busbar component for electrically connecting multiple battery cells 121, such as in parallel, series, or mixed connections. Specifically, the busbar component can achieve electrical connection between battery cells 121 by connecting the electrode terminals of the battery cells 121. Further, the busbar component can be fixed to the electrode terminals of the battery cells 121 by welding. The electrical energy of the multiple battery cells 121 can be further led out through the housing 11 via a conductive mechanism.

[0109] The number of battery cells 121 can be set to any value depending on different power requirements. Multiple battery cells 121 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 121, for ease of installation, the battery cells 121 can be grouped, with each group of battery cells 121 forming a battery cell assembly 12. The number of battery cells 121 included in a battery cell assembly 12 is unlimited and can be set according to requirements. The battery device 100 may include multiple battery cell assemblies 12, which can be connected in series, parallel, or mixed connection.

[0110] According to some embodiments of this application, please refer to 3- Figure 5 The battery device 100 includes a battery cell assembly and a housing 11. The battery cell assembly includes a plurality of battery cells 121, a first end plate 122, and a second end plate 123. The first end plate 122 and the second end plate 123 are spaced apart along a first direction X, and the plurality of battery cells 121 are disposed between the first end plate 122 and the second end plate 123. The housing 11 is used to house the battery cell assembly and has a bearing surface 114 for supporting the battery cells 121. The first end plate 122 includes a first end 115 near the bearing surface 114 and a second end 116 away from the bearing surface 114. The first end 115 is connected to the housing 11. The housing 11 also includes a first beam 117 located along the first direction X on the side of the first end plate 122 away from the battery cells 121. The battery cell assembly also includes a support member 119, at least a portion of which is located between the first beam 117 and the first end plate 122.

[0111] In some embodiments, please refer to Figure 9 The housing 11 includes a support plate 134, which is used to support the battery cell assembly 12. The surface of the support plate 134 facing the battery cell assembly 12 is the support surface 114.

[0112] In some embodiments, the housing 11 includes a frame 113, a support plate, and a bottom plate. The frame 113 surrounds the bottom plate, and the support plate is connected to the frame 113. The support plate supports the battery cell assembly 12. Along the thickness direction of the bottom plate, the support plate is located between the battery cell assembly 12 and the bottom plate. The surface of the support plate facing the battery cell assembly 12 is the bearing surface 114. In other embodiments, the support plate has a flow channel for accommodating a heat exchange medium used to regulate the temperature of the battery cell 121.

[0113] In some embodiments, the housing 11 includes a frame 113 and a base plate, the frame 113 surrounding the base plate, the base plate supporting the battery cell assembly 12, and the surface of the base plate facing the battery cell assembly 12 being the bearing surface 114.

[0114] In some embodiments, the frame 113 includes a plurality of beams connected end to end, and the first beam 117 can be any beam of the frame 113.

[0115] In some embodiments, the housing 11 includes a frame 113 and a limiting beam. The limiting beam is disposed within and connected to the frame 113, and the first beam 117 can be the limiting beam.

[0116] In some embodiments, the battery device 100 includes only one battery cell assembly and a first beam 117 and a second beam 118, which are spaced apart along a first direction X. The battery cell assembly is disposed between the first beam 117 and the second beam 118, with a first end plate 122 closer to the first beam 117 than a second end plate 123 along the first direction X. The battery cell assembly includes a plurality of supports 119, each support including a first sub-support and a second sub-support. At least a portion of the first sub-support is located between the first beam 117 and the first end plate 122, and at least a portion of the second sub-support is located between the second beam 118 and the second end plate 123.

[0117] In some embodiments, please refer to Figure 4 The first end plate 122 has a cavity inside. This design allows the first end plate 122 to have a certain collapsible energy absorption effect, and also reduces the overall weight of the first end plate 122, which is beneficial to improving the energy density of the battery device 100.

[0118] In some embodiments, please refer to Figure 4 The second end plate 123 has a cavity inside. This design allows the second end plate 123 to have a certain collapsible energy absorption effect, and also reduces the overall weight of the second end plate 123, which is beneficial to improving the energy density of the battery device 100.

[0119] In some embodiments, the first end plate 122 is made of plastic.

[0120] In some embodiments, the second end plate 123 is made of plastic.

[0121] In some embodiments, the first end 115 is connected to the first beam 117. For example, the first beam 117 includes a first part and a second part. The first part is connected to the housing 11, and the second part is disposed on the surface of the first part away from the bearing surface 114. Among the plurality of battery cells 121, the battery cell 121 closest to the first end plate 122 is the first end battery cell, and the first end plate 122 is located between the second part and the first end battery cell.

[0122] In some embodiments, the housing 11 further includes a second beam 118, and a second end plate 123 is connected to the second beam 118.

[0123] The shape of the cross section of the first beam 117 includes, but is not limited to, a zigzag shape, an L-shape, or a straight line.

[0124] The shape of the cross section of the second beam 118 includes, but is not limited to, a zigzag shape, an L-shape, or a straight line.

[0125] In some embodiments, the first beam 117 is made of metal, including but not limited to aluminum alloy, magnesium alloy, steel, etc.

[0126] In some embodiments, the second beam 118 is made of metal, including but not limited to aluminum alloy, magnesium alloy, steel, etc.

[0127] In some embodiments, in the second direction Y, the side of the center line of the first end plate 122 away from the bearing surface 114 is the second end 116, and the side of the center line of the first end plate 122 close to the bearing surface 114 is the first end 115, and the second direction Y is perpendicular to the bearing surface 114.

[0128] In some embodiments, the first end 115 is connected to the support plate 134, which is used to support the battery cell assembly 12.

[0129] At least a portion of the support member 119 is located between the first beam 117 and the first end plate 122, meaning that a force transmission path is formed between the first beam 117 and the first end plate 122. When the battery cell 121 expands, the resulting expansion force can be transmitted to the first beam 117 through the support member 119. In other words, the expansion force can be transmitted to the first beam 117 more quickly through the support member 119, and the support member 119, which is at least partially located between the first beam 117 and the first end plate 122, can limit the displacement of the second end 116.

[0130] In some embodiments, the support member 119 is connected to the first beam 117.

[0131] In some embodiments, the support 119 is connected to the housing 11, and at least a portion of the support 119 is located between the first beam 117 and the first end plate 122.

[0132] In some embodiments, please refer to Figure 3 , Figure 6 and Figure 7 Multiple battery cells 121 are arranged in multiple columns between the first end plate 122 and the second end plate 123, with each column of battery cells 121 arranged along a first direction X. Multiple support members 119 are provided, spaced apart along a third direction Z, which is perpendicular to the first direction X. Both the third direction Z and the first direction X are parallel to the bearing surface 114. Each support member 119 corresponds one-to-one with a column of battery cells 121.

[0133] The battery cell 121 includes one or more electrode assemblies and a housing. The housing may include a casing and end caps, wherein multiple walls of the casing form a cavity for accommodating the electrode assemblies. The casing is shaped according to the combination of the one or more electrode assemblies; for example, the casing may be a hollow cuboid, cube, or regular polyhedron, and one face of the casing has an opening to allow the one or more electrode assemblies to be placed inside the casing. The end caps close the opening of the casing. The casing is filled with an electrolyte, such as a liquid electrolyte solution.

[0134] The battery cell 121 may also include two electrode terminals, which can be disposed on an end cap. The end cap is typically flat, and the two electrode terminals are fixed to the flat surface of the end cap, representing a positive electrode terminal and a negative electrode terminal, respectively. Each electrode terminal is provided with a corresponding adapter, which is located between the end cap and the electrode assembly to electrically connect the electrode assembly and the electrode terminal. In this battery cell 121, depending on actual usage requirements, the electrode assembly can be single or multiple, and the battery cell 121 contains multiple independent electrode assemblies.

[0135] In some embodiments, the battery device 100 further includes a busbar component electrically connected to the battery cell 121. The support member 119 is provided to reduce the risk of failure of the electrical connection between the busbar component and the battery cell 121. Exemplarily, the busbar component is connected to the electrode terminals to achieve its electrical connection with the battery cell 121.

[0136] In some embodiments, the first beam 117 and the first end plate 122 are spaced apart along the first direction X. In other embodiments, the minimum distance between the first beam 117 and the first end plate 122 along the first direction X is less than the maximum size of the battery cell 121.

[0137] In the technical solution of this application embodiment, since at least a portion of the support member 119 is located between the first beam 117 and the first end plate 122, a mechanical transmission path is formed between the first beam 117 and the first end plate 122. When the battery cell 121 expands, the resulting expansion force can be transmitted to the first beam 117 through the support member 119, thereby fully utilizing the structural rigidity of the housing 11 itself to share the expansion force and reducing the risk of damage to the first end plate 122 due to excessive expansion force. Furthermore, the support member 119 can also control the displacement of the second end 116 within a reasonable range, thereby ensuring high structural stability of the battery cell assembly. This, in turn, improves the reliability of the battery device 100.

[0138] According to some embodiments of this application, please refer to 3- Figure 8 The support member 119 is connected to the first end plate 122.

[0139] In some embodiments, the support member 119 is integrally formed with the first end plate 122.

[0140] In some embodiments, the support member 119 may be connected to the first end plate 122 by means of welding, bonding, fastener connection, snap-fit, etc.

[0141] In the above solution, connecting the support member 119 to the first end plate 122 can further improve the bending strength of the first end plate 122 and reduce the risk of local deformation of the first end plate 122. Furthermore, when the first end plate 122 displaces, the support member 119 can displace synchronously with the first end plate 122, reducing the risk of shear stress concentration caused by a displacement difference between the support member 119 and the first end plate 122. This further improves the reliability of the first end plate 122.

[0142] According to some embodiments of this application, please refer to 3- Figure 8 The support member 119 is located between the second end 116 and the first beam 117.

[0143] The support member 119 is disposed between the second end 116 and the first beam 117, which means that the support member 119 can limit the displacement of the second end 116.

[0144] In the above scheme, since the first end 115 is connected to the housing 11 and the second end 116 is not directly connected to the housing 11, the support member 119 is placed between the second end 116 and the first beam 117. This significantly reduces the risk of structural instability caused by excessive displacement of the second end 116 due to the expansion of the battery cells 121, which would reduce the constraint force of multiple battery cells 121. This is beneficial for ensuring that the battery cell assembly has high structural stability.

[0145] According to some embodiments of this application, please refer to Figures 3-8The support member 119 is integrally formed with the first end plate 122.

[0146] The support component 119 and the first end plate 122 can be integrally formed by casting, 3D printing, injection molding, extrusion molding, sheet metal bending, etc.

[0147] In some embodiments, please refer to Figure 6 The support member 119 is a protrusion that protrudes from the surface of the first end plate 122 away from the battery cell 121 in the first direction X.

[0148] In the above solution, by integrally molding the support member 119 with the first end plate 122, the connection interface between the support member 119 and the first end plate 122 can be eliminated, reducing the risk of stress concentration at the connection interface when the battery cell 121 expands, and improving the reliability of the first end plate 122. Furthermore, it can reduce assembly steps and improve the production efficiency of the battery device 100. Simultaneously, it can also reduce the risk of vibration of the battery device 100 causing wear on the support member 119 and the first end plate 122 due to the presence of the connection interface.

[0149] According to some embodiments of this application, please refer to Figure 7 From the second end 116 to the first end 115, the support member 119 protrudes from the first end plate 122 in the first direction X, and the size gradually decreases.

[0150] From the second end 116 to the first end 115, the size of the support member 119 protruding from the first end plate 122 in the first direction X gradually decreases. This means that the size of the support member 119 protruding from the first end plate 122 in the first direction X matches the amount of displacement that the first end plate 122 may experience. For example, the larger the size of the support member 119 protruding from the first end plate 122 in the first direction X, the greater the amount of displacement that the first end plate 122 may experience.

[0151] In the above scheme, since the first end 115 is connected to the housing 11, the second end 116 is not directly connected to the housing 11. When the battery cell 121 expands, the displacement of the second end 116 is greater than the displacement of the first end 115. By designing the support member 119 to protrude from the first end plate 122 in the first direction X with gradually decreasing dimensions from the second end 116 to the first end 115, the risk of excessive deformation in areas with large displacement can be effectively reduced, and the risk of local stress concentration caused by excessive constraint can be reduced in areas with small displacement.

[0152] According to some embodiments of this application, please refer to Figures 3-5 as well as Figure 8 The support member 119 is separately formed from the first end plate 122, and the support member 119 is connected to the first end plate 122.

[0153] Support component 119 can be formed by machining, 3D printing, casting, sheet metal bending, etc.

[0154] The fact that the support member 119 and the first end plate 122 are formed separately means that the support member 119 and the first end plate 122 are connected after being processed separately.

[0155] In the above scheme, since the support member 119 and the first end plate 122 are formed separately, the cost of manufacturing the support member 119 and the first end plate 122 by means of separate forming is relatively low.

[0156] According to some embodiments of this application, please refer to Figures 3-5 as well as Figure 8 The first end plate 122 has a first end face 1221 facing away from the bearing surface 114; the support member 119 includes a support portion 1191 and a connecting portion 1192 connected to each other. The connecting portion 1192 is disposed on the first end face 1221 and connected to the first end plate 122. Along the first direction X, the support portion 1191 is located between the first beam 117 and the first end plate 122.

[0157] In some embodiments, multiple connecting portions 1192 are provided, spaced apart along a third direction Z, which is perpendicular to a first direction X. Both the third direction Z and the first direction X are parallel to the bearing surface 114. The multiple connecting portions 1192 include a first connecting portion and a second connecting portion. The first connecting portion is connected to a first end plate 122 via a first fastener 124. The second connecting portion engages with the first end plate 122. In other embodiments, the second connecting portion includes a body and a locking block. The body connects the locking block to a support portion 1191. The locking block is located on at least one side of the body along the third direction Z, and is spaced apart from the support portion 1191. However, when the locking block is only located on one side of the body along the third direction Z, it also serves as a foolproof mechanism.

[0158] The connecting part 1192 is disposed on the first end face 1221 and connected to the first end plate 122. Along the first direction X, the supporting part 1191 is located between the first beam 117 and the first end plate 122. This means that the connecting part 1192 can be assembled to the vicinity of the second end 116 within a large assembly space.

[0159] In the above scheme, since the first end face 1221 is away from the bearing surface 114, the first end face 1221 has a relatively large assembly space, which can reduce the assembly difficulty of the support 119.

[0160] According to some embodiments of this application, please refer to Figures 3-5 as well as Figure 7 The connecting part 1192 is connected to the first end plate 122 by the first fastener 124.

[0161] In some embodiments, the first end plate 122 has a first end face 1221 facing away from the bearing surface 114 and a second end face 1222 facing the bearing surface 114. The first end plate 122 has a first through hole 1223. Along the second direction Y, the first through hole 1223 penetrates the first end face 1221 and the second end face 1222. The second direction Y is perpendicular to the bearing surface 114. One end of the first fastener 124 extends into the first through hole 1223 and locks the connecting part 1192 to the first end face 1221.

[0162] In some embodiments, the first fastener 124 includes a shank and a flange, the flange protruding from the outer peripheral surface of the shank, and a portion of the connecting portion 1192 is located between the flange and the first end face 1221.

[0163] In the above solution, since the connecting part 1192 is connected to the first end plate 122 through the first fastener 124, the support 119 can be replaced independently without the need to replace the end plate at the same time, which can reduce the maintenance cost of the battery device 100.

[0164] According to some embodiments of this application, please refer to Figures 3-5 Along the first direction X, the support member 119 and the first beam 117 are spaced apart. Alternatively, the support member 119 and the first beam 117 abut against each other.

[0165] Along the first direction X, the support member 119 and the first beam 117 are spaced apart, meaning that there is a gap between the support member 119 and the first beam 117 along the first direction X. The support member 119 will only come into contact with the first beam 117 after the first end plate 122 has undergone a certain displacement.

[0166] In some embodiments, the displacement amplitude of the first end plate 122 can be observed based on the sensor and battery cell 121 expansion force simulation technology, and the size of the support member 119 along the first direction X can be adjusted so that the support member 119 is adapted to the expansion force.

[0167] In the above scheme, the support member 119 and the first beam 117 are spaced apart along the first direction X. This reduces the risk of stress concentration at the connection interface between the support member 119 and the first beam 117 after the support member 119 is assembled. When the support member 119 and the first beam 117 abut against each other, the expansion force can be transmitted to the first beam 117 more quickly, allowing the first beam 117 to share the expansion force in a timely manner.

[0168] According to some embodiments of this application, please refer to Figures 3-5 Both the support member 119 and the first end plate 122 are metal parts.

[0169] The material of the support component 119 may include, but is not limited to, aluminum alloy, magnesium alloy, steel, etc.

[0170] In the above scheme, since the support member 119 and the first end plate 122 are both metal parts, the support member 119 and the first end plate 122 have high structural strength, which is conducive to the battery cell assembly having high structural stability.

[0171] According to some embodiments of this application, please refer to Figures 3-5 The material of the support member 119 includes aluminum alloy, and the material of the first end plate 122 includes aluminum alloy.

[0172] In some embodiments, the aluminum alloy is an aluminum-magnesium-silicon (Al-Mg-Si) alloy.

[0173] In the above scheme, since the support member 119 is made of aluminum alloy and the first end plate 122 is made of aluminum alloy, both the support member 119 and the first end plate 122 have a lighter weight, which is beneficial to enable the battery device 100 to have a higher energy density.

[0174] According to some embodiments of this application, please refer to Figure 3 and Figure 4 The battery cell assembly also includes a first binding member 126 and a second binding member 127. Both the first binding member 126 and the second binding member 127 are used to bind the first end plate 122, the second end plate 123 and the multiple battery cells 121. The first binding member 126 and the second binding member 127 are spaced apart along a second direction Y, which is perpendicular to the bearing surface 114. The first binding member 126 is closer to the bearing surface 114 than the second binding member 127, and the tensile strength of the second binding member 127 is greater than the tensile strength of the first binding member 126.

[0175] In some embodiments, the binding member 125 may be a loop structure capable of being fitted around the periphery of a plurality of battery cells 121. In other embodiments, the binding member 125 may be a rope structure with its ends connected to bind the plurality of battery cells 121.

[0176] In some embodiments, within the same projection plane perpendicular to the first direction X, the orthographic projection of the battery cell 121 lies within the orthographic projection of the first end plate 122 and the second end plate 123. With this arrangement, most of the binding force of the strapping member 125 is borne by the first end plate 122 and the second end plate 123, reducing the risk of excessive deformation of the battery cell 121.

[0177] In some embodiments, the strapping element 125 is made of metal.

[0178] In some embodiments, the strapping element 125 is made of plastic.

[0179] In some embodiments, the outer surface of the first end plate 122 is provided with a plurality of spaced-apart limiting portions 1224. The limiting portions 1224 protrude from the surface of the first end plate 122 and are used to restrict the movement of the strapping member 125 relative to the first end plate 122 along the second direction Y, which is perpendicular to the bearing surface 114. On the one hand, this can provide a positioning effect for the assembly of the strapping member 125; on the other hand, it can reduce the risk of wear caused by the strapping member 125 sliding along the second direction Y.

[0180] In some embodiments, the binding member 125 is a strap, and the two ends of the strap can be connected together by welding, bonding, hot-melt connection or other methods.

[0181] The tensile strength of the second binding member 127 is greater than that of the first binding member 126, meaning that the second binding member 127 is more difficult to fail than the first binding member 126. Failure can be understood as breakage, excessive deformation, or loss of binding force.

[0182] In the above scheme, the binding member 125 can bind multiple battery cells 121 between the first end plate 122 and the second end plate 123, thus arranging the multiple battery cells 121 in an orderly manner inside the housing 11, improving the space utilization rate inside the housing 11, and helping to improve the energy density of the battery device 100. At the same time, the support member 119 can also reduce the risk of the binding member 125 breaking due to excessive expansion force, thereby giving the battery cell assembly higher structural stability. Furthermore, since the first end 115 is connected to the housing 11, the second end 116 is not directly connected to the housing 11. Positioning the second binding member 127, which has higher tensile strength, near the second end 116 can reduce the risk of the binding member 125 failing due to excessive displacement of the second end 116, thereby reducing the risk of structural instability of the multiple battery cells 121. This contributes to giving the battery cell assembly higher structural stability.

[0183] According to some embodiments of this application, please refer to Figure 3 and Figure 4 The second binding component 127 is made of metal, while the first binding component 126 is made of plastic.

[0184] The material of the second strapping component 127 may include, but is not limited to, aluminum alloy, magnesium alloy, steel, stainless steel, etc.

[0185] In some embodiments, the second strapping member 127 is provided with an insulating layer on the side facing the battery cell 121 to reduce the risk of short circuit between the second strapping member 127 and the battery cell 121.

[0186] The material of the first bundle 126 may include, but is not limited to, polyimide, carbon fiber reinforced plastic, polypropylene, polyester, polyamide, polyetheretherketone, etc.

[0187] In the above solution, the second binding member 127 is made of metal, while the first binding member 126 is made of plastic. This design not only ensures high structural stability of the battery cell assembly but also reduces the manufacturing cost of the battery device 100.

[0188] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 9 and Figure 10 Multiple battery cells 121 are arranged in multiple columns between the first end plate 122 and the second end plate 123, with each column of battery cells 121 arranged along the first direction X. Multiple second binding members 127 are provided, each of which corresponds one-to-one with a column of battery cells 121, and each second binding member 127 is used to bind the corresponding column of battery cells 121.

[0189] In some embodiments, the first end plate 122 may be provided with a plurality of grooves 128, the plurality of grooves 128 corresponding one-to-one with a plurality of first binding members 126, and the second binding member 127 being received in the corresponding groove 128.

[0190] In the above scheme, when the battery cell assembly includes multiple rows of battery cells 121, each second binding member 127 is used to bind the corresponding row of battery cells 121, so that each row of battery cells 121 has high structural stability, thereby enabling the battery cell assembly to have high structural stability.

[0191] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 9 and Figure 10 Within the same projection plane perpendicular to the third direction Z, the orthographic projections of two adjacent second binding members 127 do not overlap, and the third direction Z, the second direction Y, and the first direction X are perpendicular to each other.

[0192] Within the same projection plane perpendicular to the third direction Z, the orthographic projections of two adjacent second binding members 127 do not overlap, meaning that two adjacent second binding members 127 do not contact each other.

[0193] In the above scheme, since the orthographic projections of two adjacent second binding members 127 do not overlap in the same projection plane perpendicular to the third direction Z, the risk of contact wear and failure of the two second binding members 127 in the third direction Z can be reduced.

[0194] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 9 and Figure 10On the same projection plane perpendicular to the second direction Y, the orthographic projection portions of two adjacent second binding members 127 overlap.

[0195] On the same projection plane perpendicular to the second direction Y, the orthographic projections of two adjacent second strapping members 127 overlap, meaning that two adjacent second strapping members 127 can share a portion of the space.

[0196] In the above scheme, since the orthographic projections of two adjacent second strapping members 127 overlap on the same projection plane perpendicular to the second direction Y, the two adjacent second strapping members 127 can share a portion of the space, which is beneficial to improving the energy density of the battery device 100.

[0197] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 9 and Figure 10 The first end plate 122 is provided with a groove 128, and a portion of each of the two adjacent second binding members 127 is provided in the same groove 128.

[0198] In some embodiments, the first end plate 122 has a first end face 1221 facing away from the bearing surface 114 and a second end face 1222 facing the bearing surface 114, and the groove 128 extends to the first end face 1221. This arrangement facilitates the assembly of the second strapping member 127 into the groove 128 from the side of the first end face 1221.

[0199] In the above scheme, two adjacent first binding members 126 are accommodated in the same groove 128, which allows the assembly of the two first binding members 126 to be completed while the first end plate 122 has high structural strength.

[0200] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 14 The battery cell assembly also includes a side plate 132, which is disposed on one side of the plurality of battery cells 121 in a third direction Z. The third direction Z is perpendicular to the first direction X, and both the third direction Z and the first direction X are parallel to the bearing surface 114. The side plate 132 connects the first end plate 122 and the second end plate 123. Along the second direction Y, the side plate 132 is located between the first binding member 126 and the second binding member 127.

[0201] In some embodiments, two side plates 132 are provided, and the two side plates 132 are respectively provided on both sides of the plurality of battery cells 121 in the third direction Z.

[0202] Side plate 132 can be connected to the first end plate 122 and the second end plate 123 by welding, fastener connection, snap-fitting, or bonding. For example, please refer to... Figure 4 and Figure 9The side plate 132 can be connected to the first end plate 122 and the second end plate 123 via the second fastener 135.

[0203] In the above solution, since the side plate 132 is connected to the first end plate 122 and the second end plate 123, the side plate 132 can reduce the risk of structural instability of multiple battery cells 121 due to excessive displacement of the first end plate 122 and the second end plate 123 when the battery cell 121 expands. Furthermore, the side plate 132 being located between the first binding member 126 and the second binding member 127 can reduce the risk of interference between the side plate 132 and the first binding member 126 and the second binding member 127 during assembly.

[0204] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 11 and Figure 12 The battery cell assembly also includes a heat insulation pad 129 and a first buffer pad 130 spaced apart along the first direction X. The heat insulation pad 129 is disposed between two adjacent battery cells 121, and the first buffer pad 130 is disposed between two adjacent battery cells 121. The compressive strength of the heat insulation pad 129 is greater than the compressive strength of the first buffer pad 130.

[0205] In some embodiments, the first buffer pad 130 may be flat. Only one first buffer pad 130 is disposed between two adjacent battery cells 121.

[0206] In some embodiments, the material of the first cushioning pad 130 includes one or more of silicone foam, microporous foamed polypropylene, melamine, and hard rubber.

[0207] The heat insulation pad 129 and the first buffer pad 130 are spaced apart along the first direction X, which means that if a heat insulation pad 129 is provided between two adjacent battery cells 121, the first buffer pad 130 will not be provided, and if the first buffer pad 130 is provided, the heat insulation pad 129 will not be provided.

[0208] In some embodiments, the first buffer pad 130 includes a first buffer portion 1301 and a second buffer portion 1302, which are arranged circumferentially along the wall portion of the battery cell 121 in the first direction X.

[0209] In some embodiments, please refer to Figure 11 There are two first buffer sections 1301 and two second buffer sections 1302. The two first buffer sections 1301 are spaced apart along the second direction Y, and the two second buffer sections 1302 are spaced apart along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0210] In some embodiments, one of the first buffer portion 1301 and the second buffer portion 1302 is in the shape of a straight line and the other is in the shape of a U. The first buffer portion 1301 and the second buffer portion 1302 together form a square frame structure.

[0211] In some embodiments, multiple first buffer portions 1301 and multiple second buffer portions 1302 are provided, and the multiple first buffer portions 1301 and multiple second buffer portions 1302 together form a frame structure. Adjacent first buffer portions 1301 and adjacent second buffer portions 1302 are arranged at an angle.

[0212] The compressive strength of the first buffer section 1301 may be the same as or different from the compressive strength of the second buffer section 1302.

[0213] In some embodiments, the material of the first buffer portion 1301 includes one or more of silicone foam and microporous foamed polypropylene.

[0214] In some embodiments, the material of the second buffer portion 1302 includes one or more of melamine and hard rubber.

[0215] In some embodiments, the material of the heat insulation pad 129 includes one or more of mica and aerogel.

[0216] The heat insulation pad 129 can be connected to the battery cell 121 by means of adhesive, fastener connection, snap-fit, etc. Of course, the heat insulation pad 129 can also be connected to the housing 11 and placed between two adjacent battery cells 121.

[0217] The first buffer pad 130 can be connected to the battery cell 121 by means of adhesive bonding, fastener connection, snap-fit, etc. Of course, the heat insulation pad 129 can also be connected to the housing 11 and placed between two adjacent battery cells 121.

[0218] The compressive strength of the heat insulation pad 129 is greater than that of the first buffer pad 130, meaning that the first buffer pad 130 is more easily deformed than the heat insulation pad 129 when subjected to external force. After the first buffer pad 130 is placed between two adjacent battery cells 121, the spacing between the two battery cells 121 can be further reduced because the first buffer pad 130 is easily deformed under force, making the structure of the battery cell assembly more compact and thus improving the energy density of the battery device 100.

[0219] In the above scheme, since the heat insulation pad 129 and the first buffer pad 130 are spaced apart along the first direction X, and the heat insulation pad 129 is disposed between two adjacent battery cells 121, and the first buffer pad 130 is disposed between two adjacent battery cells 121, the battery cell assembly can take into account both buffering and heat insulation capabilities, thus possessing high reliability. Furthermore, since the compressive strength of the heat insulation pad 129 is greater than that of the first buffer pad 130, compared to distributing the heat insulation pad 129 between every two adjacent battery cells 121, the overall size along the first direction X after multiple battery cells 121 are grouped together can be designed to be smaller, which is beneficial for improving the energy density of the battery device 100.

[0220] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 11 and Figure 12 Multiple heat insulation pads 129 and multiple first buffer pads 130 are provided, and the multiple heat insulation pads 129 and multiple buffer pads are alternately arranged along the first direction X.

[0221] Taking the placement of a first buffer pad 130 between the first and second battery cells 121 as an example, a heat insulation pad 129 is placed between the second and third battery cells 121, the first buffer pad 130 is placed between the third and fourth battery cells 121, and a heat insulation pad 129 is placed between the fourth and fifth battery cells 121, and so on. This arrangement can be described as multiple heat insulation pads 129 and multiple buffer pads being alternately arranged along the first direction X.

[0222] In the above scheme, when the battery cell 121 expands, multiple heat insulation pads 129 and multiple buffer pads are alternately arranged along the first direction X, which can make the overall stress of the battery cell assembly more uniform and help the battery cell assembly to have higher structural stability.

[0223] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 13 The plurality of battery cells 121 include a first battery cell 1211 and a second battery cell 1212 arranged adjacent to each other along a third direction Z. The third direction Z is perpendicular to the first direction X, and both the third direction Z and the first direction X are parallel to the bearing surface 114. A second buffer pad 131 is provided between the first battery cell 1211 and the second battery cell 1212 along the third direction Z.

[0224] The material of the second buffer pad 131 may include, but is not limited to, silicone rubber, fluororubber, polyurethane foam, cross-linked polyethylene, ceramic fiber reinforced rubber, etc.

[0225] In the above scheme, the second buffer pad 131 can absorb the stress of the first battery cell 1211 and the second battery cell 1212 in the third direction Z, which is beneficial to improving the structural stability of the battery cell assembly.

[0226] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 15 Among the multiple battery cells 121, the battery cell 121 closest to the first end plate 122 is the first end battery cell; the battery cell assembly also includes an insulating member 133 and a third buffer pad. Along the first direction X, at least a portion of the insulating member 133 is located between the first end battery cell and the first end plate 122, and the third buffer pad is disposed between the insulating member 133 and the first end plate 122.

[0227] The material of the insulating component 133 may include, but is not limited to, polyethylene, polypropylene, polyethylene terephthalate, polyimide, polyamide, etc.

[0228] In some embodiments, the insulating member 133 includes a body portion 1331, two first flange portions 1332, and a second flange portion 1333. A portion of the body portion 1331 is located between the first end battery cell and the first end plate 122. The two first flange portions 1332 are respectively located on both sides of the body portion 1331 in the third direction Z. The first flange portions 1332 are bent from the edges of the body portion 1331 in the third direction Z toward the first end battery cell. The second flange portion 1333 is disposed at the end of the body portion 1331 away from the bearing surface 114 in the first direction X. The second flange portion 1333 is bent from the edges of the body portion 1331 in the first direction X toward the first end battery cell. In other embodiments, the first flange portion 1332 is disposed at the end of the body portion 1331 away from the bearing surface 114 in the first direction X. This design allows the insulation component 133 to be positioned using three flanges, reducing the assembly difficulty of the insulation component 133. In addition, after the insulation component 133 is assembled, it also has high connection stability with the first end battery cell.

[0229] In some embodiments, the insulating member 133 may be connected to the first end battery cell and / or the first end plate 122 by means of bonding or the like.

[0230] In some embodiments, the material of the third cushioning pad includes one or more of silicone foam, microporous foamed polypropylene, melamine, and hard rubber.

[0231] In the above scheme, the installation of the insulating component 133 can reduce the risk of short circuit between the first end battery cell and the first end plate 122. The installation of the third buffer pad can form a controllable energy absorption zone between the first end battery cell and the first end plate 122, which is beneficial to improving the reliability of the battery device 100.

[0232] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 9 and Figure 10 The first end plate 122 has a first end face 1221 facing away from the bearing surface 114 and a second end face 1222 facing the bearing surface 114. The first end plate 122 has a first through hole 1223. Along the second direction Y, the first through hole 1223 passes through the first end face 1221 and the second end face 1222. The second direction Y is perpendicular to the bearing surface 114. The battery cell assembly also includes a first fastener 124. The first fastener 124 passes through the first through hole 1223. One end of the first fastener 124 extending out of the second end face 1222 is connected to the housing 11.

[0233] In some embodiments, one end of the first fastener 124 extending out of the second end face 1222 is connected to the first beam 117.

[0234] In some embodiments, the first fastener 124 includes a rod and a flange, the flange protruding from the outer peripheral surface of the rod and located on the side of the first end face 1221 away from the bearing surface 114 along the second direction Y, and one end of the rod extending out of the second end face 1222 is connected to the housing 11.

[0235] In the above solution, since the first fastener 124 passes through the first through hole 1223 along the second direction Y, penetrating the first end face 1221 and the second end face 1222, and the end of the first fastener 124 extending out of the second end face 1222 is connected to the housing 11, and at least a portion of the support member 119 is located between the first beam 117 and the first end plate 122, a mechanical transmission path is formed between the first beam 117 and the first end plate 122. When the battery cell 121 expands, the expansion force generated can be transmitted to the first beam 117 through the support member 119, thereby making full use of the structural rigidity of the housing 11 itself to share the expansion force. Furthermore, this reduces the risk of the first fastener 124 failing due to excessive expansion force, and also reduces the risk of stress concentration between the first fastener 124 and the first end plate 122 causing excessive deformation of the first end plate 122.

[0236] According to some embodiments of this application, please refer to Figure 3 and Figure 4 as well as Figure 9 and Figure 10 Multiple first fasteners 124 are provided, and the multiple first fasteners 124 are spaced apart along the third direction Z. The third direction Z, the second direction Y and the first direction X are perpendicular to each other.

[0237] In some embodiments, portions of the plurality of first fasteners 124 are used to secure the first end plate 122, and other portions of the plurality of first fasteners 124 simultaneously secure the support member 119 and the first end plate 122.

[0238] In the above solution, the multiple first fasteners 124 can further improve the connection stability between the first end plate 122 and the housing 11. Furthermore, when the battery cell 121 expands, the risk of structural instability of multiple battery cells 121 due to excessive displacement of the first end plate 122 is reduced.

[0239] According to some embodiments of this application, please refer to Figure 3 and Figure 4 The battery cell 121 is a square battery cell, and the surface of the battery cell 121 in the first direction X is the surface with the largest area in the battery cell 121.

[0240] In the above scheme, when the battery cell 121 expands and deforms, the wall containing the largest surface has a larger deformation range compared to the wall containing other surfaces. By placing at least a portion of the support member 119 between the first beam 117 and the first end plate 122 along the first direction X, the risk of damage to the first end plate 122 due to excessive expansion force can be significantly reduced.

[0241] According to some embodiments of this application, please refer to Figure 1 This application provides an electrical device that includes the battery device 100 in one or more of the above embodiments, the battery device 100 being used to provide electrical energy.

[0242] In the above solutions, since the battery device 100 in one or more of the above embodiments has high reliability, the power-consuming device including the battery device 100 in one or more of the above embodiments also has high reliability.

[0243] According to some embodiments of this application, please refer to Figures 3-15 This application provides a battery device 100, which includes a battery cell assembly 12 and a housing 11. The housing 11 includes a frame 113, a base plate, and a support plate. The frame 113 surrounds the base plate, and the support plate is disposed between the battery cell assembly 12 and the base plate along the second direction Y. The support plate is used to support the battery cell assembly 12. The battery cell assembly 12 includes a plurality of battery cells 121. The support plate has a flow channel for accommodating a heat exchange medium, which is used to regulate the temperature of the battery cells 121. The battery cells 121 are prismatic, and the surface of the battery cell 121 in the first direction X is the surface with the largest area among the battery cells 121.

[0244] The housing 11 also includes multiple first beams 117 and multiple second beams 118, both of which are disposed within and connected to the frame 113. The first beams 117 and the frame 113 together define an energy compartment, within which a battery cell assembly 12 is disposed. The second beams 118 divide the energy compartment into multiple sub-compartments, each containing multiple battery cell assemblies 12, with each battery cell assembly 12 corresponding to one of the multiple sub-compartments. Each battery cell assembly 12 is disposed within its corresponding sub-compartment.

[0245] The battery cell assembly includes multiple battery cells 121, a first end plate 122, and a second end plate 123. The first end plate 122 and the second end plate 123 are spaced apart along a first direction X, and the multiple battery cells 121 are disposed between the first end plate 122 and the second end plate 123. The first end plate 122 is connected to a first beam 117, and the second end plate 123 is connected to a second beam 118.

[0246] The battery cell assembly includes a strapping member 125, which is used to bind a first end plate 122, a second end plate 123, and multiple battery cells 121. The strapping member 125 includes a first strapping member 126 and a second strapping member 127, which are spaced apart along a second direction Y, perpendicular to the bearing surface 114. The first strapping member 126 is closer to the bearing surface 114 than the second strapping member 127, and the tensile strength of the second strapping member 127 is greater than that of the first strapping member 126. Multiple battery cells 121 are arranged in multiple columns between the first end plate 122 and the second end plate 123, with each column of battery cells 121 arranged along a first direction X. Multiple second strapping members 127 are provided, each corresponding to one column of battery cells 121, and each second strapping member 127 is used to bind its corresponding column of battery cells 121. Within the same projection plane perpendicular to the third direction Z, the orthographic projections of two adjacent second binding members 127 do not overlap, and the third direction Z, the second direction Y, and the first direction X are mutually perpendicular. Within the same projection plane perpendicular to the second direction Y, the orthographic projections of two adjacent second binding members 127 partially overlap. The first end plate 122 is provided with a groove 128, and a portion of each of two adjacent second binding members 127 is disposed within the same groove 128.

[0247] The battery cell assembly includes heat insulation pads 129 and first buffer pads 130 spaced apart along a first direction X. The heat insulation pads 129 are disposed between two adjacent battery cells 121, and the first buffer pads 130 are disposed between two adjacent battery cells 121. The compressive strength of the heat insulation pads 129 is greater than that of the first buffer pads 130. Multiple heat insulation pads 129 and multiple first buffer pads 130 are provided, and the multiple heat insulation pads 129 and multiple buffer pads are alternately arranged along the first direction X.

[0248] Each of the multiple battery cells 121 in the battery cell assembly includes a first battery cell 1211 and a second battery cell 1212 arranged adjacent to each other along a third direction Z. The third direction Z is perpendicular to the first direction X, and both the third direction Z and the first direction X are parallel to the bearing surface 114. A second buffer pad 131 is provided between the first battery cell 1211 and the second battery cell 1212 along the third direction Z.

[0249] The battery cell assembly includes a side plate 132, which is disposed on one side of a plurality of battery cells 121 in a third direction Z. The third direction Z is perpendicular to the first direction X, and both the third direction Z and the first direction X are parallel to the bearing surface 114. The side plate 132 connects the first end plate 122 and the second end plate 123.

[0250] Among the plurality of battery cells 121, the battery cell 121 closest to the first end plate 122 is the first end battery cell; among the plurality of battery cells 121, the battery cell 121 closest to the second end plate 123 is the second end battery cell; both the battery cell assembly and the second battery cell assembly include an insulating member 133, and multiple insulating members 133 are provided. Along the first direction X, at least a portion of one insulating member 133 is located between the first end battery cell and the first end plate 122. At least a portion of one insulating member 133 is located between the second end battery cell and the second end plate 123. Along the first direction X, a third buffer pad is provided between the insulating member 133 and the end plate.

[0251] The end plate has a first end face 1221 facing away from the bearing surface 114 and a second end face 1222 facing the bearing surface 114. The end plate has a first through hole 1223 extending along a second direction Y, through the first end face 1221 and the second end face 1222. The second direction Y is perpendicular to the bearing surface 114. Both the battery cell assembly and the second battery cell assembly include a first fastener 124, which passes through the first through hole 1223. Multiple first fasteners 124 are provided. One end of some first fasteners 124 extending out of the second end face 1222 is connected to the first beam 117. One end of some first fasteners 124 extending out of the second end face 1222 is connected to the second beam 118. Multiple first fasteners 124 are provided in each end plate, and the multiple first fasteners 124 are spaced apart along a third direction Z. The third direction Z, the second direction Y, and the first direction X are perpendicular to each other.

[0252] The support plate has a bearing surface 114 for supporting the battery cell 121. The first end plate 122 includes a first end 115 near the bearing surface 114 and a second end 116 away from the bearing surface 114. The first end 115 is connected to a first beam 117. Along a first direction X, the first beam 117 is located on the side of the first end plate 122 opposite to the battery cell 121. The battery cell assembly also includes a support member 119, at least a portion of which is located between the first beam 117 and the first end plate 122. The support member 119 is connected to the first end plate 122. The support member 119 is disposed between the second end 116 and the first beam 117. Along the first direction X, the support member 119 and the first beam 117 are spaced apart. The first end plate 122 has a first end face 1221 facing away from the bearing surface 114; the support member 119 includes a support portion 1191 and a connecting portion 1192 connected to each other. The connecting portion 1192 is disposed on the first end face 1221 and connected to the first end plate 122. Along the first direction X, the support portion 1191 is located between the first beam 117 and the first end plate 122. The connecting portion 1192 is connected to the first end plate 122 by a first fastener 124.

[0253] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery cell assembly includes multiple battery cells, a first end plate, and a second end plate. The first end plate and the second end plate are spaced apart along a first direction, and the multiple battery cells are disposed between the first end plate and the second end plate. A housing for housing the battery cell assembly, the housing having a support surface for supporting the battery cells, and a first end plate including a first end close to the support surface and a second end away from the support surface, the first end being connected to the housing; The housing further includes a first beam along the first direction, the first beam being located on the side of the first end plate away from the battery cell, and the battery cell assembly further includes a support member, at least a portion of which is located between the first beam and the first end plate.

2. The battery device according to claim 1, characterized in that, The support member is connected to the first end plate.

3. The battery device according to claim 1, characterized in that, The support is disposed between the second end and the first beam.

4. The battery device according to claim 1, characterized in that, The support member is integrally formed with the first end plate.

5. The battery device according to claim 4, characterized in that, From the second end to the first end, the size of the support member protruding from the first end plate in the first direction gradually decreases.

6. The battery device according to claim 1, characterized in that, The support member is formed separately from the first end plate, and the support member is connected to the first end plate.

7. The battery device according to claim 6, characterized in that, The first end plate has a first end face that faces away from the bearing surface; The support member includes a support portion and a connecting portion that are connected to each other. The connecting portion is disposed on the first end face and connected to the first end plate. Along the first direction, the support portion is located between the first beam and the first end plate.

8. The battery device according to claim 7, characterized in that, The connecting part is connected to the first end plate by a first fastener.

9. The battery device according to claim 1, characterized in that, Along the first direction, the support member is spaced apart from the first beam; or, the support member abuts against the first beam.

10. The battery device according to claim 1, characterized in that, Both the support member and the first end plate are metal parts.

11. The battery device according to claim 10, characterized in that, The support component is made of aluminum alloy, and the first end plate is also made of aluminum alloy.

12. The battery device according to claim 1, characterized in that, The battery cell assembly further includes a first binding member and a second binding member. Both the first binding member and the second binding member are used to bind the first end plate, the second end plate and the plurality of battery cells. The first binding member and the second binding member are spaced apart along a second direction, which is perpendicular to the bearing surface. The first binding member is closer to the bearing surface than the second binding member, and the tensile strength of the second binding member is greater than that of the first binding member.

13. The battery device according to claim 12, characterized in that, The second strapping component is made of metal, while the first strapping component is made of plastic.

14. The battery device according to claim 12, characterized in that, The multiple battery cells between the first end plate and the second end plate are arranged in multiple columns, and the battery cells in each column are arranged along the first direction; Multiple second binding members are provided, and each of the multiple second binding members corresponds one-to-one with a column of battery cells. Each second binding member is used to bind the corresponding column of battery cells.

15. The battery device according to claim 14, characterized in that, Within the same projection plane perpendicular to the third direction, the orthographic projections of two adjacent second binding members do not overlap, and the third direction, the second direction, and the first direction are perpendicular to each other.

16. The battery device according to claim 14, characterized in that, On the same projection plane perpendicular to the second direction, the orthographic projection portions of two adjacent second binding members overlap.

17. The battery device according to claim 14, characterized in that, The first end plate is provided with a groove, and a portion of each of the two adjacent second binding members is disposed in the same groove.

18. The battery device according to claim 12, characterized in that, The battery cell assembly also includes a side plate, which is disposed on one side of the plurality of battery cells in a third direction. The third direction is perpendicular to the first direction, and both the third direction and the first direction are parallel to the bearing surface. The side plate connects the first end plate and the second end plate, and along the second direction, the side plate is located between the first binding member and the second binding member.

19. The battery device according to claim 1, characterized in that, The battery cell assembly further includes a heat insulation pad and a first buffer pad spaced apart along the first direction. The heat insulation pad is disposed between two adjacent battery cells, and the first buffer pad is disposed between two adjacent battery cells. The compressive strength of the heat insulation pad is greater than that of the first buffer pad.

20. The battery device according to claim 19, characterized in that, Multiple heat insulation pads and multiple first buffer pads are provided, and the multiple heat insulation pads and multiple first buffer pads are alternately arranged along the first direction.

21. The battery device according to claim 1, characterized in that, The plurality of battery cells include a first battery cell and a second battery cell arranged adjacent to each other along a third direction, wherein the third direction is perpendicular to the first direction and both the third direction and the first direction are parallel to the bearing surface; Along the third direction, a second buffer pad is provided between the first battery cell and the second battery cell.

22. The battery device according to claim 1, characterized in that, The battery cell closest to the first end plate among the plurality of battery cells is the first end battery cell; The battery cell assembly further includes an insulating element and a third buffer pad. Along the first direction, at least a portion of the insulating element is located between the first end battery cell and the first end plate, and the third buffer pad is disposed between the insulating element and the first end plate.

23. The battery device according to claim 1, characterized in that, The first end plate has a first end face facing away from the bearing surface and a second end face facing the bearing surface. The first end plate has a first through hole, which penetrates the first end face and the second end face along a second direction, which is perpendicular to the bearing surface. The battery cell assembly also includes a first fastener, which passes through the first through hole, and one end of the first fastener extending out of the second end face is connected to the housing.

24. The battery device according to claim 23, characterized in that, Multiple first fasteners are provided, and the multiple first fasteners are spaced apart along a third direction, wherein the third direction, the second direction, and the first direction are perpendicular to each other.

25. The battery device according to claim 1, characterized in that, The battery cell is a square battery cell, and the surface of the battery cell in the first direction is the surface with the largest area in the battery cell.

26. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-25, the battery device being used to provide electrical energy.

Images