Battery device and electric device

Abstract

The utility model provides a battery device and an electric device. The battery device comprises a box body, at least two battery monomers and a heat insulation piece, the at least two battery monomers are accommodated in the box body and are arranged along a first direction, each battery monomer comprises a shell, the shell comprises two side walls which are oppositely arranged along the first direction, the side walls comprise a first wall part and a second wall part, the first wall part is arranged at at least one end of the second wall part in a second direction, and the heat insulation piece is arranged on the first wall part. The size of the first wall part in the third direction is smaller than that of the second wall part in the third direction, the heat insulation part comprises a first heat insulation part, and the first heat insulation part is arranged between the first wall parts of two adjacent battery monomers, so that the problem that the first wall parts of the battery monomers and other surrounding devices influence each other in the aspect of temperature is solved; the temperature of the single battery is stabilized, and the performance of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery device and an electrical device. Background Art

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] In the related art, a battery device usually includes a plurality of battery cells placed in a box. The high temperature generated during the operation of the battery cells will affect the surrounding devices, resulting in a decrease in the performance of the battery device, which urgently needs to be improved. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the problem that the heat of the battery cell affects the surrounding devices, and help improve the performance of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising: a box body; a battery cell, at least two battery cells are accommodated in the box body and arranged along a first direction, the battery cell comprises a shell, the shell comprises two side walls arranged opposite to each other along the first direction, the side walls comprise a first wall portion and a second wall portion, the first wall portion is arranged at at least one end of the second wall portion in the second direction, a dimension of the first wall portion in the third direction is smaller than a dimension of the second wall portion in the third direction, and the first direction, the second direction and the third direction intersect with each other; a thermal insulation member, comprising a first thermal insulation portion, the first thermal insulation portion is arranged between the first wall portions of two adjacent battery cells.

[0006] In the scheme of the embodiment of the present application, the battery device includes a box body, a battery cell and a thermal insulation member, at least two battery cells are accommodated in the box body and arranged along a first direction, the battery cell includes a shell, the shell includes two side walls arranged opposite to each other along the first direction, the side walls include a first wall portion and a second wall portion, the first wall portion is arranged at at least one end of the second wall portion in the second direction, the dimension of the first wall portion in the third direction is smaller than the dimension of the second wall portion in the third direction, and the thermal insulation member includes a first thermal insulation portion, and the first thermal insulation portion is arranged between the first wall portions of two adjacent battery cells to improve the problem of mutual temperature influence between the first wall portion of the battery cell and other surrounding devices, which helps to stabilize the temperature of the battery cell and improve the performance of the battery device.

[0007] In some embodiments, the battery cell further includes an end cap assembly and an electrode assembly, the shell includes an opening on at least one side in the second direction, the electrode assembly is accommodated in the shell, the end cap assembly includes an end cap plate and an electrode terminal connected to each other, the end cap plate covers the opening, the electrode assembly and the electrode terminal are connected, and the thermal insulation member further includes an insulating portion, the insulating portion is arranged on a side of the end cap plate away from the electrode assembly, and the insulating portion is connected to the first thermal insulation portion at at least one end thereof in the first direction.

[0008] In the scheme of the embodiment of the present application, the thermal insulation part also includes an insulating part arranged on the side of the end cover plate away from the shell, the insulating part is used to improve the insulation performance of the end cover assembly and surrounding devices, and the first thermal insulation part is connected to at least one end of the insulating part in the first direction thereof. By integrating the first thermal insulation part and the insulating part together, the first thermal insulation part can be fixed by the insulating part to reduce the risk of the first thermal insulation part falling off, and the processing steps of the battery device are simplified, which helps to improve the production capacity of the battery device.

[0009] In some embodiments, the end cover plate includes a protrusion and two connecting portions, the two connecting portions are arranged on both sides of the protrusion in the second direction thereof, the electrode terminal is arranged on the connecting portion, the protrusion is protruded relative to the connecting portion in a direction away from the electrode assembly, the second wall portion is connected to the connecting portion, the first wall portion is connected to the protrusion, the insulating portion includes a first part and a second part connected to each other, the first part is arranged on the protrusion, the second part is arranged on the connecting portion, and the first thermal insulation portion is connected to the first part.

[0010] In the solution of the embodiment of the present application, a protrusion is provided on the end cover plate to help increase the internal space of the shell and improve the capacity of the battery cell. The first part is provided on the protrusion, and the first insulation part and the first part are connected, which not only facilitates the first insulation part to be provided on the first wall part, but also helps to reduce the size of the first insulation part and reduce the cost of the insulation component.

[0011] In some embodiments, the thermal insulation member further includes a second thermal insulation portion, and at least a portion of the second thermal insulation portion is disposed between the second wall portions of two adjacent battery cells.

[0012] In the solution of the embodiment of the present application, by providing a second heat insulating portion, the size of the heat insulating member is increased to reduce the impact of the heat of the battery cell on surrounding devices, thereby improving the performance of the battery device.

[0013] In some embodiments, the first thermal insulation portion and the second thermal insulation portion are integrally formed, or the first thermal insulation portion and the second thermal insulation portion are separately formed.

[0014] In the solution of the embodiment of the present application, the first thermal insulation part and the second thermal insulation part are integrally formed, with high material utilization and low processing cost; or the first thermal insulation part and the second thermal insulation part are separately formed to facilitate adjustment of the shape and material of the first thermal insulation part and the second thermal insulation part, so as to better adapt the thermal insulation part and the battery cell.

[0015] In some embodiments, the first thermal insulation portion and the second thermal insulation portion are separately formed and connected to each other.

[0016] In the solution of the embodiment of the present application, when the first thermal insulation part and the second thermal insulation part are separately formed and arranged, the two are connected to each other to improve the problem that there is a gap between the first thermal insulation part and the second thermal insulation part, and the heat of the battery cell is easily affected by the gap to affect the surrounding devices, thereby improving the reliability of the thermal insulation component.

[0017] In some embodiments, the thermal conductivity of the first thermal insulation portion is greater than the thermal conductivity of the second thermal insulation portion.

[0018] In the solution of the embodiment of the present application, the thermal conductivity of the first insulation part is greater than the thermal conductivity of the second insulation part, so as to enhance the heat dissipation capacity at the first wall portion, reduce the risk of heat accumulation at the first wall portion causing degradation of battery cell performance, and improve the reliability of the insulation component.

[0019] In some embodiments, the first heat insulating portion is configured to be elastically deformable along a first direction.

[0020] In the solution of the embodiment of the present application, the first insulation part is elastically deformable along the first direction, so that the first insulation part can be used to absorb errors in the battery cell assembly process, buffer the impact of external force on the battery cell, and absorb the expansion and extrusion of the battery cell, thereby improving the reliability of the battery device.

[0021] In some embodiments, the first heat insulating portion and at least a portion of the edges of the first wall portion are spaced apart from each other.

[0022] In the solution of the embodiment of the present application, the first insulation part and at least part of the edge of the first wall part are arranged at intervals to improve the problem of additional thermal stress concentration in the edge weld area of ​​the first wall part due to the presence of the first insulation part, which leads to weld cracking, thereby improving the reliability of the battery device.

[0023] In some embodiments, the dimension H of the first thermal insulation portion in the second direction is 1 , the dimension H of the first wall portion in the second direction 2 , satisfying H 2 -3mm≤H 1 <H 2 , and / or, the dimension L of the first heat insulating part in the third direction 1 , the dimension L of the first wall portion in the third direction 2 , satisfying L 2 -3mm≤L 1 <L 2 mm.

[0024] In the scheme of the embodiment of the present application, when the dimensions of the first thermal insulation part and the first wall part meet the above conditions, at least part of the outer edge of the first thermal insulation part is located inside the first wall part, so as to improve the risk of thermal stress concentration at the edge part of the first thermal insulation part, causing damage to the first thermal insulation part, which helps to improve the reliability of the thermal insulation component.

[0025] In a second aspect, the present application provides an electrical device, comprising the battery device of the embodiment of the first aspect described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0028] Figure 2 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0029] Figure 3 It is a structural schematic diagram of a battery module provided in one embodiment of the application;

[0030] Figure 4 is an exploded diagram of a battery cell provided in one embodiment of the present application;

[0031] Figure 5 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0032] Figure 6 is a partial structural schematic diagram of a battery device provided in one embodiment of the present application;

[0033] Figure 7 is a front view of a battery cell of a battery device provided in one embodiment of the present application;

[0034] Figure 8 is a partial structural schematic diagram of a battery device provided in another embodiment of the present application;

[0035] Fig. 9 yes Figure 8 A schematic diagram of the enlarged structure at A in the middle;

[0036] Fig.10 is a partial structural schematic diagram of a battery device provided in another embodiment of the present application;

[0037] Fig.11 It is a partial structural schematic diagram of a battery device provided in yet another embodiment of the present application.

[0038] Description of reference numerals:

[0039] 1. Vehicle; 101. Motor; 102. Controller;

[0040] 2. Battery device; 201. Battery module; 202. Box; 2021. First box; 2022. Second box;

[0041] 3. Battery cells;

[0042] 4. Shell; 41. Side wall; 42. End wall; 411. First wall portion; 412. Second wall portion;

[0043] 5. Electrode assembly;

[0044] 6. end cap assembly; 61. end cap plate; 62. electrode terminal; 611. protrusion; 612. connection portion;

[0045] 7. thermal insulation member; 71. first thermal insulation portion; 72. second thermal insulation portion; 73. insulating portion; 731. first portion; 732. second portion;

[0046] 8. Pressure relief mechanism;

[0047] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

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

[0049] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0050] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0051] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0055] In the related art, a battery device generally includes a plurality of battery cells placed in a box. The high temperature generated during the operation of the battery cells will affect surrounding devices, resulting in a decrease in the performance of the battery device.

[0056] In the related art, in order to increase the internal space size of the battery cell shell, a solution of partially protruding the end cover assembly can be adopted. After adopting this solution, a part of the shell side wall will be protruded. The thermal insulation pad in the related art cannot be well adapted to the protrusion, resulting in the heat generated by the battery cell being transferred to the surrounding environment and devices through the protrusion.

[0057] Based on the above problems, an embodiment of the present application provides a battery device, which includes a box body, a battery cell and a thermal insulation member. At least two battery cells are accommodated in the box body and arranged along a first direction. The battery cell includes a shell, the shell includes two side walls arranged opposite to each other along the first direction, the side walls include a first wall portion and a second wall portion, the first wall portion is arranged at at least one end of the second wall portion in the second direction, the dimension of the first wall portion in the third direction is smaller than the dimension of the second wall portion in the third direction, and the thermal insulation member includes a first thermal insulation portion. By arranging the first thermal insulation portion between the first wall portions of two adjacent battery cells, the problem of mutual temperature influence between the first wall portion of the battery cell and other surrounding devices is improved, which helps to stabilize the temperature of the battery cell and improve the performance of the battery device.

[0058] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0059] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0060] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0061] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application. The battery cell can be cylindrical, flat, rectangular or other shapes, which is not limited in the embodiments of the present application.

[0062] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in the present application may include a battery module or a battery pack. The battery pack generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0063] A battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collector and a welding portion for connecting the positive electrode ear, the positive electrode current collector is coated with a positive electrode active material layer, and the positive electrode ear is not coated with a positive electrode active material layer. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a welding portion for connecting the negative electrode ear, the negative electrode current collector is coated with a negative electrode active material layer, and the negative electrode ear is not coated with a negative electrode active material layer. The negative electrode current collector may be made of copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon or silicon, etc. The separator may be made of PP (polypropylene) or PE (polyethylene), etc.

[0064] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including a box and electrical equipment using the battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0065] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided for some embodiments of the present application. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 2 is provided inside the vehicle 1, and the battery device 2 may be provided at the bottom, head or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 102 and a motor 101, and the controller 102 is used to control the battery to power the motor 101, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0066] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0067] Figure 2 A schematic structural diagram of a battery device according to an embodiment of the present application is shown.

[0068] The battery device 2 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 3, and the plurality of battery cells 3 are connected in series, in parallel or in mixed connection through a busbar.

[0069] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 3 .

[0070] As an example, the battery cell assembly may be a battery module 201, and the battery module 201 is formed by arranging and fixing a plurality of battery cells 3 to form an independent module. As an example, the battery module 201 may be formed by bundling a plurality of battery cells 3 by a cable tie.

[0071] In some embodiments, the battery device may be a battery pack, which includes a case 202 and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case 202 .

[0072] As an example, the battery cell assembly may be a battery module 201 , and the battery cell assembly may be accommodated in the box by fixing the battery module 201 in the box.

[0073] As an example, the battery cell assembly may also be accommodated in the box body 202 by directly fixing the plurality of battery cells 3 to the box body 202 .

[0074] As an example, the box 202 may include a first box 2021 and a second box 2022. The first box 2021 and the second box 2022 are buckled together to form a closed space inside the box 202 to accommodate the battery cell assembly. The closed space here means covering or closing, which can be sealed or unsealed. The first box 2021 can be an end cover or a bottom plate.

[0075] As an example, the box body 202 may include an end cover, a frame, and a bottom plate. The end cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 202 to accommodate the battery cell assembly.

[0076] In some embodiments, the box 202 can be used as a part of the chassis structure of the vehicle. For example, a part of the box 202 can become at least a part of the floor of the vehicle, or a part of the box 202 can become at least a part of the cross beam and the longitudinal beam of the vehicle.

[0077] Figure 3 A schematic structural diagram of a battery module 201 according to an embodiment of the present application is shown.

[0078] In some embodiments, Figure 2 and Figure 3As shown, there are multiple battery cells 3, and the multiple battery cells 3 are first connected in series, parallel or mixed to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel or mixed to form a whole, and are accommodated in the box 202.

[0079] The multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel connection, series connection or mixed connection of the multiple battery cells 3 in the battery module 201 .

[0080] Figure 4 FIG. 1 is an exploded view of a battery cell provided in an embodiment of the present application. A battery cell 3 refers to the smallest unit constituting a battery. Figure 4 The battery cell 3 includes an end cover assembly 6 , a shell 4 and an electrode assembly 5 .

[0081] The electrode assembly 5 is a component in the battery cell 3 where electrochemical reactions occur. One or more electrode assemblies 5 may be included in the housing 4. The electrode assembly 5 is mainly formed by winding or stacking pole sheets, which are divided into positive pole sheets and negative pole sheets, and an isolation member is usually provided between the positive pole sheet and the negative pole sheet. The parts of the positive pole sheet and the negative pole sheet with active materials constitute the electrode body, and the parts of the positive pole sheet and the negative pole sheet without active materials each constitute a pole ear. The positive pole ear and the negative pole ear may be located together at one end of the electrode body or respectively at both ends of the electrode body. During the charge and discharge process of the battery cell 3, the positive active material and the negative active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0082] The electrode assembly 5 may be a winding structure, a laminated structure, or a mixed structure of winding and laminated structures.

[0083] In some embodiments, the electrode assembly 5 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0084] In some embodiments, the electrode assembly 5 is a laminated structure. As an example, a plurality of positive and negative electrodes may be provided, and the plurality of positive and negative electrodes may be alternately stacked, and a plurality of separators may be provided, and each separator may be provided between any adjacent positive or negative electrodes, or the separator may be provided continuously and folded between any adjacent positive or negative electrodes.

[0085] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat, or polygonal.

[0086] In some embodiments, the electrode assembly 5 is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0087] The battery cell 3 may include a shell. The shell 4 is a component used to cooperate with the end cap assembly 6 to form an internal environment of the battery cell 3, wherein the formed internal environment can be used to accommodate the electrode assembly 5, the electrolyte (not shown in the figure) and other components. The shell 4 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell 4 can be a sealed structure or a non-sealed structure. As an example, when the shell 4 is a non-sealed structure, the shell 4 plays a role in protecting the electrode assembly 5, and a sealing bag is also included between the shell 4 and the electrode assembly 5, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell 4 is a sealed structure, it is used to encapsulate components such as the electrode assembly 5 and the electrolyte.

[0088] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0089] The housing 4 and the end cap assembly 6 may be independent components, and one or more openings may be provided on the housing 4, and one or more end cap assemblies 6 cover the openings to form the internal environment of the battery cell 3. Optionally, the end cap assembly 6 and the housing 4 may be integrated. Optionally, the end cap assembly 6 and the housing 4 may form a common connection surface before other components are placed in the housing, and when the interior of the housing 4 needs to be encapsulated, the end cap assembly 6 covers the housing 4.

[0090] In some embodiments, the electrode terminal 62 may be disposed on the end cap assembly 6 or on the housing 4, and the electrode terminal 62 is electrically connected to the tab. The electrode terminal 62 may be directly connected to the tab or indirectly connected to the tab through a switching mechanism.

[0091] See also Figure 5 and Figure 6 , Figure 5 is a schematic structural diagram of a battery device provided in one embodiment of the present application; Figure 6 It is a partial structural schematic diagram of a battery device provided in one embodiment of the present application.

[0092] First, as Figure 5 and Figure 6As shown, the present application provides a battery device 2, which includes a box body 202, a battery cell 3 and a heat insulating member 7. At least two battery cells 3 are accommodated in the box body 202 and arranged along a first direction X. The battery cell 3 includes a shell 4, and the shell 4 includes two side walls 41 arranged opposite to each other along the first direction X. The side wall 41 includes a first wall portion 411 and a second wall portion 412. The first wall portion 411 is arranged at at least one end of the second wall portion 412 in the second direction Y. The size of the first wall portion 411 in the third direction Z is smaller than the size of the second wall portion 412 in the third direction Z. The first direction X, the second direction Y and the third direction Z intersect each other. The heat insulating member 7 includes a first heat insulating portion 71, and the first heat insulating portion 71 is arranged between the first wall portions 411 of two adjacent battery cells 3.

[0093] In the scheme of the embodiment of the present application, the battery device 2 includes a box body 202, a battery cell 3 and a thermal insulation member 7, at least two battery cells 3 are accommodated in the box body 202 and arranged along the first direction X, the battery cell 3 includes a shell 4, the shell 4 includes two side walls 41 arranged opposite to each other along the first direction X, the side wall 41 includes a first wall portion 411 and a second wall portion 412, the first wall portion 411 is arranged at at least one end of the second wall portion 412 in the second direction Y, the size of the first wall portion 411 in the third direction Z is smaller than the size of the second wall portion 412 in the third direction Z, and the thermal insulation member 7 includes a first thermal insulation portion 71. By arranging the first thermal insulation portion 71 between the first wall portions 411 of two adjacent battery cells 3, the problem of mutual temperature influence between the first wall portion 411 of the battery cell 3 and other surrounding devices is improved, which helps to stabilize the temperature of the battery cell 3 and improve the performance of the battery device 2.

[0094] Optionally, a plurality of battery cells 3 may be disposed in the box body 202 , and the plurality of battery cells 3 are distributed in n rows and m columns along the first direction X and the third direction Z, where n≥2 and m≥1.

[0095] Optionally, the first wall portion 411 and the second wall portion 412 are integrally formed to reduce the problem of a joint seam between the two that affects the sealing performance of the shell 4 .

[0096] Optionally, the shell 4 includes two side walls 41 and two end walls 42 connected to each other, the two side walls 41 are relatively arranged along the first direction X, the two end walls 42 are relatively arranged along the second direction Y, and the thermal insulation member 7 is only arranged on the side walls 41, or the thermal insulation member is arranged on the side walls 41 and the end walls 42.

[0097] Optionally, the side wall 41 includes a first wall portion 411 and a second wall portion 412, and the first wall portion 411 is arranged at either end of the second wall portion 412 in the second direction Y; or the side wall 41 includes two first wall portions 411 and a second wall portion 412, and the two first wall portions 411 are arranged at both ends of the second wall portion 412 in the second direction Y.

[0098] Optionally, the specific dimensions of the first wall portion 411 and the second wall portion 412 in the third direction Z and the relative positions of the first wall portion 411 and the second wall portion 412 in the third direction Z can be designed independently. For example, the first wall portion 411 is centered on the second wall portion 412 in the third direction Z.

[0099] The heat insulating member 7 is used to block the heat conducted from the outside to the battery cell 3, reducing the risk of overheating and runaway of the battery cell 3; and to block the heat generated by the battery cell 3, reducing the impact of the heat of the battery cell 3 on the surrounding environment, adjacent battery cells 3 and other devices. Exemplarily, the material of the heat insulating member 7 can be ceramic fiber, silica gel, glass fiber, rubber, aerogel, etc.

[0100] Exemplarily, the other devices may be other battery cells 3 around the battery cell 3 , connecting harnesses, boxes, etc.

[0101] Optionally, the first thermal insulation portion 71 can be used to prevent the high temperature at the first wall portion 411 from heating other surrounding devices. Exemplarily, the first thermal insulation portion 71 can improve the problem of the heat of the first wall portion 411 heating other battery cells 3, connecting wiring harnesses, etc.; the first thermal insulation portion 71 can also be used to block the high temperature of surrounding devices to slow down the temperature rise of the first wall portion 411. Exemplarily, the first thermal insulation portion 71 can block the heat of other surrounding battery cells 3, connecting wiring harnesses and the box body to slow down the temperature rise of the first wall portion 411.

[0102] Optionally, the first heat insulating portion 71 is disposed between the first wall portions 411 of two adjacent battery cells 3 , that is, at least a portion of the orthographic projection of the first heat insulating portion 71 in the first direction X overlaps with the first wall portion 411 .

[0103] Optionally, the shape and size of the first heat insulating portion 71 can be designed by oneself. For example, the shapes of the first heat insulating portion 71 and the first wall portion 411 match each other, or the first heat insulating portion 71 is rectangular or trapezoidal.

[0104] Optionally, a first heat insulating portion 71 is disposed between two adjacent first wall portions 411 to reduce the cost of the heat insulating member 7 , or two first heat insulating portions 71 are respectively disposed on two adjacent first wall portions 411 to improve the heat insulating effect of the heat insulating member 7 .

[0105] Optionally, the first heat insulating portion 71 is bonded to the first wall portion 411 by a thermally conductive colloid or an insulating colloid to reduce the risk of the first heat insulating portion 71 falling off.

[0106] In some embodiments, Figure 5 and Figure 6 As shown, the first heat insulating portion 71 is elastically deformable along the first direction X.

[0107] In these embodiments, the first insulation portion 71 is elastically deformable along the first direction X, so that the first insulation portion 71 can be used to absorb errors in the assembly process of the battery cell 3, buffer the impact of external force on the battery cell 3, and absorb the expansion and extrusion of the battery cell 3, thereby improving the reliability of the battery device 2.

[0108] Exemplarily, the material of the first heat insulating part 71 can be a material having a specific heat insulating effect and elasticity, such as silicone, rubber, or aerogel.

[0109] Optionally, the heat insulating member 7 is made of an insulating material, or an insulating layer is provided on the outer surface of the heat insulating member 7 . The heat insulating member 7 can be used to improve the insulation performance of adjacent battery cells 3 .

[0110] See also Figure 7 , Figure 7 It is a front view of a battery cell of a battery device provided in one embodiment of the present application.

[0111] Optional, such as Figures 5 to 7 As shown, the dimension H of the first wall portion 411 in the second direction Y of the first heat insulating portion 71 is 1 The dimension H of the first wall portion 411 in the second direction Y is 2 , satisfying H 2 -5mm≤H 1 ≤H 2 +5mm; the dimension L of the first heat insulating portion 71 in the third direction Z 1 , the dimension L of the first wall portion 411 in the third direction Z 2 , satisfying L 2 -3mm≤L 1 ≤L 2 +1mm.

[0112] In some embodiments, Figures 5 to 7 As shown, the first heat insulating portion 71 and at least a portion of the edge of the first wall portion 411 are spaced apart.

[0113] In these embodiments, the first thermal insulation portion 71 and at least a portion of the edges of the first wall portion 411 are spaced apart to improve the problem of weld cracking caused by additional thermal stress concentration in the edge weld area of ​​the first wall portion 411 due to the presence of the first thermal insulation portion 71, thereby improving the reliability of the battery device 2.

[0114] Specifically, if the first wall portion 411 and the second wall portion 412 are separately provided, the edge of the first wall portion 411 is respectively welded to the second wall portion 412 and the end cover assembly 6; or if the first wall portion 411 and the second wall portion 412 are integrally provided, the edge of the first wall portion 411 is welded to the end cover assembly 6. The first heat insulating portion 71 and at least a portion of the edge of the first wall portion 411 are spaced apart, which means that at least a portion of the edge of the first wall portion 411 is not covered by the first heat insulating portion 71.

[0115] Optionally, the first heat insulation portion 71 is spaced apart from an edge of the first wall portion 411 along the second direction Y, and / or the first heat insulation portion 71 is spaced apart from an edge of the first wall portion 411 along the third direction Z.

[0116] In some embodiments, Figures 5 to 7 As shown, the dimension H of the first heat insulating portion 71 in the second direction Y is 1 The dimension H of the first wall portion 411 in the second direction Y is 2 , satisfying H 2 -3mm≤H 1 <H 2 , and / or, the dimension L of the first heat insulating portion 71 in the third direction Z 1 , the dimension L of the first wall portion 411 in the third direction Z 2 , satisfying L 2 -3mm≤L 1 <L 2 mm.

[0117] In these embodiments, when the sizes of the first thermal insulation part 71 and the first wall part 411 meet the above conditions, at least part of the outer edge of the first thermal insulation part 71 is located inside the first wall part 411, so as to improve the risk of thermal stress concentration at the edge portion of the first thermal insulation part 71, causing damage to the first thermal insulation part 71, which helps to improve the reliability of the thermal insulation component 7.

[0118] For example, the dimension H of the first heat insulating portion 71 in the second direction Y is 1 Can be H 2 -3mm, H 2 -2mm, H 2 -1mm, etc.; the dimension L of the first heat insulating portion 71 in the third direction Z 1 Can be L 2 -3mm, L 2 -2mm, L 2 -1mm, etc.

[0119] See also Figure 8 , Figure 8 It is a partial structural schematic diagram of a battery device provided in another embodiment of the present application.

[0120] In some embodiments, Figure 5 and Figure 8 As shown, the battery cell 3 also includes an end cover assembly 6 and an electrode assembly 5, the shell 4 includes an opening on at least one side in the second direction Y, the electrode assembly 5 is accommodated in the shell 4, the end cover assembly 6 includes an end cover plate 61 and an electrode terminal 62 that are connected to each other, the end cover plate 61 covers the opening, the electrode assembly 5 and the electrode terminal 62 are connected, and the thermal insulation member 7 also includes an insulating portion 73, the insulating portion 73 is arranged on a side of the end cover plate 61 away from the electrode assembly 5, and the insulating portion 73 is connected to the first thermal insulation portion 71 at least one end thereof in the first direction X.

[0121] In these embodiments, the thermal insulation member 7 also includes an insulating portion 73 disposed on the side of the end cover plate 61 away from the shell 4, and the insulating portion 73 is used to improve the insulation performance of the end cover assembly 6 and surrounding devices. The first thermal insulation portion 71 is connected to at least one end of the insulating portion 73 in the first direction X. By integrating the first thermal insulation portion 71 and the insulating portion 73 together, the first thermal insulation portion 71 can be fixed by the insulating portion 73 to reduce the risk of the first thermal insulation portion 71 falling off, and the processing steps of the battery device 2 are simplified, which helps to improve the production capacity of the battery device 2.

[0122] The thermal insulation part 7 includes an insulating part 73 and a first thermal insulation part 71 which are connected to each other. The insulating part 73 covers at least a portion of the surface of the end cover plate 61 on the side facing away from the shell 4 to improve the insulation performance of the end cover assembly 6. The first thermal insulation part 71 and the insulating part 73 are connected and bent to extend to the first wall part 411.

[0123] Exemplarily, the insulating portion 73 and the end cover plate 61 are connected by bonding or hot melting.

[0124] Optionally, the insulating part 73 and the first thermal insulation part 71 are integrally formed to reduce the difficulty of processing the two; or the insulating part 73 and the first thermal insulation part 71 are separately arranged and integrated together to facilitate the adjustment of the materials of the insulating part 73 and the first thermal insulation part 71. The integrated insulating part 73 and the first thermal insulation part 71 are jointly assembled on the battery cell 3 to simplify the processing steps of the battery device 2.

[0125] Optionally, two first thermal insulation parts 71 are arranged on both sides of the insulating part 73 in the first direction X, and each first wall part 411 is provided with an independent first thermal insulation part 71 to improve the thermal insulation effect of the thermal insulation component 7; or each first thermal insulation part 71 is arranged on one side of the insulating part 73 in the first direction X, and two adjacent first wall parts 411 share one first thermal insulation part 71, thereby reducing the material cost of the thermal insulation component 7.

[0126] Optionally, the first heat insulation portion 71 may also cover at least a portion of the second wall portion 412 to enhance the heat insulation effect of the first heat insulation portion 71 .

[0127] Optionally, the battery cell 3 further includes a pressure relief mechanism 8 , which is disposed on the end cover assembly 6 , and a through hole is disposed on the insulating portion 73 to expose the pressure relief mechanism 8 .

[0128] See also Fig. 9 , Fig. 9 yes Figure 8 Schematic diagram of the enlarged structure at point A in the middle.

[0129] In some embodiments, Figure 5 , Figure 8 and Fig. 9 As shown, the end cover plate 61 includes a protrusion 611 and two connecting portions 612, the two connecting portions 612 are respectively arranged on both sides of the protrusion 611 in the second direction Y thereof, the electrode terminal 62 is arranged on the connecting portion 612, the protrusion 611 is protruded relative to the connecting portion 612 in a direction away from the electrode assembly 5, the second wall portion 412 is connected to the connecting portion 612, the first wall portion 411 is connected to the protrusion 611, the insulating portion 73 includes a first portion 731 and a second portion 732 connected to each other, the first portion 731 is arranged on the protrusion 611, the second portion 732 is arranged on the connecting portion 612, and the first heat insulating portion 71 is connected to the first portion 731.

[0130] In these embodiments, the protrusion 611 is provided on the end cover plate 61 to help increase the internal space of the shell 4 and improve the capacity of the battery cell 3. The first part 731 is provided on the protrusion 611, and the first thermal insulation part 71 and the first part 731 are connected, which not only facilitates the first thermal insulation part 71 to be provided on the first wall part 411, but also helps to reduce the size of the first thermal insulation part 71 and reduce the cost of the thermal insulation component 7.

[0131] Specifically, the middle area of ​​the end cover plate 61 protrudes relative to the connecting portion 612 in a direction away from the shell 4 to form a protrusion 611, the electrode terminals are arranged on the two connecting portions 612, and the insulating portion 73 includes a first part 731 and a second part 732, the first part 731 is arranged on the outer surface of the protrusion 611, and the second part 732 is arranged on the outer surface of the connecting portion 612.

[0132] The protrusion 611 protrudes away from the shell 4 and has a groove formed on the side thereof facing the shell 4, wherein the groove includes a port in the first direction X, the first wall portion 411 is connected to the protrusion 611, that is, a partial edge of the first wall portion 411 is connected to the edge of the port, and a partial edge of the second wall portion 412 on one side of the second direction Y is connected to the connecting portion 612.

[0133] Optionally, the port includes a first edge at one end of the second direction Y and a second edge connected to the first edge and arranged opposite to each other along the third direction Z, and the first heat insulating portion 71 is connected to the first edge. Exemplarily, the first heat insulating portion 71 is connected to the first edge and abuts against the second edge, so that the first heat insulating portion 71 is in full contact with the first wall portion 411.

[0134] See also Fig.10 and Fig.11 , Fig.10 is a partial structural schematic diagram of a battery device provided in another embodiment of the present application; Fig.11 It is a partial structural schematic diagram of a battery device provided in yet another embodiment of the present application.

[0135] In some embodiments, Figure 5 , Fig.10 and Fig.11 As shown, the heat insulating member 7 further includes a second heat insulating portion 72 , and at least a portion of the second heat insulating portion 72 is disposed between the second wall portions 412 of two adjacent battery cells 3 .

[0136] In these embodiments, the second heat insulating portion 72 is provided to increase the size of the heat insulating member 7 , thereby reducing the impact of the heat of the battery cell 3 on surrounding devices and improving the performance of the battery device 2 .

[0137] Optionally, the material of the second heat insulating part 72 can be ceramic fiber, silica gel, glass fiber, rubber, aerogel, etc.

[0138] Optionally, the shape and size of the second heat insulating portion 72 can be designed by oneself. Exemplarily, the shape of the second heat insulating portion 72 matches the second wall portion 412 .

[0139] Optionally, the second heat insulating portion 72 is connected to the second wall portion 412 by bonding or hot-melting to improve the stability of the second heat insulating portion 72 .

[0140] Optionally, a second thermal insulation portion 72 is disposed between two adjacent second wall portions 412 , and the second thermal insulation portion 72 is connected to the two adjacent second wall portions 412 ; or two second thermal insulation portions 72 are disposed between two adjacent second wall portions 412 , and the two second thermal insulation portions 72 are respectively connected to the two second wall portions 412 .

[0141] Optionally, the second heat insulating portion 72 can be elastically deformable in the first direction X, so that the second heat insulating portion 72 can buffer the impact force acting on the battery cell 3 along the first direction X and absorb the assembly tolerance of the battery cell 3 in the first direction X.

[0142] Optionally, the second insulation part 72 can be arranged on the end wall 42 to increase the area of ​​the insulation member 7 and enhance the insulation capacity of the insulation member 7.

[0143] In some embodiments, Figure 5 , Fig.10 and Fig.11 As shown, the first heat insulation part 71 and the second heat insulation part 72 are integrally formed, or the first heat insulation part 71 and the second heat insulation part 72 are separately formed.

[0144] In these embodiments, the first thermal insulation part 71 and the second thermal insulation part 72 are integrally formed, with high material utilization and low processing cost; or the first thermal insulation part 71 and the second thermal insulation part 72 are separately formed to facilitate adjustment of the shape and material of the first thermal insulation part 71 and the second thermal insulation part 72 to better adapt the thermal insulation part 7 and the battery cell 3.

[0145] Optionally, the first heat insulation part 71 and the second heat insulation part 72 are separately provided, and the materials of the first heat insulation part 71 and the second heat insulation part 72 are the same or different.

[0146] In some embodiments, Figure 5 and Fig.11 As shown, the first heat insulating portion 71 and the second heat insulating portion 72 are separately formed and connected to each other.

[0147] In these embodiments, when the first thermal insulation part 71 and the second thermal insulation part 72 are separately formed, the two are connected to each other to improve the problem that there is a gap between the first thermal insulation part 71 and the second thermal insulation part 72, and the heat of the battery cell 3 is easily affected by the gap. The reliability of the thermal insulation part 7 is improved.

[0148] Optionally, the first heat insulating portion 71 and the second heat insulating portion 72 may be connected by abutment, bonding, or hot-melt connection.

[0149] In some embodiments, Figure 5 and Fig.11 As shown, the thermal conductivity of the first thermal insulation part 71 is greater than the thermal conductivity of the second thermal insulation part 72 .

[0150] In these embodiments, the thermal conductivity of the first insulation portion 71 is greater than the thermal conductivity of the second insulation portion 72, so as to enhance the heat dissipation capacity at the first wall portion 411, reduce the risk of heat accumulation at the first wall portion 411 and causing performance degradation of the battery cell 3, and improve the reliability of the thermal insulation component 7.

[0151] The temperature of the end of the battery cell 3 near the end cover assembly 6 in the second direction Y is higher, so setting the thermal conductivity of the first insulation part 71 to be greater than the thermal conductivity of the second insulation part 72 helps to conduct the heat at the first wall part 411 to the air through the first insulation part 71, improve the problem of heat accumulation at the first wall part 411, and enhance the overall insulation capacity.

[0152] Optionally, the first thermal insulation part 71 and the second thermal insulation part 72 are separately molded and made of different materials. For example, the first thermal insulation part 71 includes a phase change material, which absorbs and conducts the heat of the first wall part 411 through the phase change material; or the first thermal insulation part 71 is a composite material, specifically including two layers of thermal insulation material and a metal thermal conductive material sandwiched between the two layers of thermal insulation material, and the thermal conductivity of the first thermal insulation part 71 is improved by the metal thermal conductive material; or the first thermal insulation part 71 and the second thermal insulation part 72 are integrally arranged, and the first thermal insulation part 71 and the second thermal insulation part 72 are made of the same substrate, which can be FGM (Functionally Gradient Materials) so that the thermal conductivity of the first thermal insulation part 71 is greater than the thermal conductivity of the second thermal insulation part 72.

[0153] In a second aspect, the present application provides an electrical device, comprising the battery device of the embodiment of the first aspect described above.

[0154] In some embodiments, Figures 1 to 11As shown, the battery device 2 includes a box body 202, a battery cell 3 and a heat insulating member 7. At least two battery cells 3 are accommodated in the box body 202 and arranged along a first direction X. The battery cell 3 includes a shell 4, an end cap assembly 6 and an electrode assembly 5. The shell 4 includes two side walls 41 arranged opposite to each other along the first direction X. The two side walls 41 are arranged on both sides of the shell 4 in the first direction X. The shell 4 includes an opening on at least one side in the second direction Y. The electrode assembly 5 is accommodated in the shell 4. The end cap assembly 6 includes end caps connected to each other. The end cover plate 61 and the electrode terminal 62, the end cover plate 61 covers the opening, the electrode assembly 5 and the electrode terminal 62 are connected, the side wall 41 includes a first wall portion 411 and a second wall portion 412, the first wall portion 411 is arranged at least one end of the second wall portion 412 in the second direction Y, the size of the first wall portion 411 in the third direction Z is smaller than the size of the second wall portion 412 in the third direction Z, the end cover plate 61 includes a protruding portion 611 and a connecting portion 612, and the two connecting portions 612 are respectively connected to the protruding portion 611 in the third direction Z. At both ends, the protruding portion 611 is protruded relative to the connecting portion 612 in a direction away from the shell 4, the second wall portion 412 is connected to the connecting portion 612, and the first wall portion 411 is connected to the protruding portion 611; the heat insulating member 7 includes a first heat insulating portion 71, a second heat insulating portion 72 and an insulating portion 73, the first heat insulating portion 71 is arranged between the first wall portions 411 of two adjacent battery cells 3, the insulating portion 73 is arranged on the side of the end cover plate away from the shell 4, and the insulating portion 73 includes a first portion 731 and a second portion 73 connected to each other. 2, the first part 731 is arranged on the protruding part 611, the second part 732 is arranged on the connecting part 612, the first heat insulating part 71 is connected to the first part 731, the second heat insulating part 72 is arranged between the second wall parts 412 of two adjacent battery cells 3, the first heat insulating part 71 and the second heat insulating part 72 are connected to each other, the thermal conductivity of the first heat insulating part 71 is greater than the thermal conductivity of the second heat insulating part 72, the first heat insulating part 71 is elastically deformable along the first direction X, and the size H of the first heat insulating part 71 in the second direction Y is 1 The dimension H of the first wall portion 411 in the second direction Y is 2 , satisfying H 2 -3mm≤H 1 <H 2 , and / or, the dimension L of the first heat insulating portion 71 in the third direction Z 1 , the dimension L of the first wall portion 411 in the third direction Z 2 , satisfying L 2 -3mm≤L 1 <L 2 mm.

[0155] In these embodiments, the battery device 2 includes a box body 202, a battery cell 3 and a thermal insulation member 7, at least two battery cells 3 are accommodated in the box body 202 and arranged along a first direction X, the battery cell 3 includes a shell 4, the shell 4 includes two side walls 41 arranged opposite to each other along the first direction X, the side wall 41 includes a first wall portion 411 and a second wall portion 412, the first wall portion 411 is arranged at at least one end of the second wall portion 412 in the second direction Y, the size of the first wall portion 411 in the third direction Z is smaller than the size of the second wall portion 412 in the third direction Z, and the thermal insulation member 7 includes a first thermal insulation portion 71, and by arranging the first thermal insulation portion 71 between the first wall portions 411 of two adjacent battery cells 3, the problem of mutual temperature influence between the first wall portion 411 of the battery cell 3 and other surrounding devices is improved, which helps to stabilize the temperature of the battery cell 3 and improve the performance of the battery device 2.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Box; A battery cell, at least two of the battery cells are accommodated in the box and arranged along a first direction, the battery cell comprises a shell, the shell comprises two side walls arranged opposite to each other along the first direction, the side walls comprise a first wall portion and a second wall portion, the first wall portion is arranged at least at one end of the second wall portion in the second direction, the dimension of the first wall portion in the third direction is smaller than the dimension of the second wall portion in the third direction, and the first direction, the second direction and the third direction intersect each other; The heat insulating member comprises a first heat insulating portion, wherein the first heat insulating portion is arranged between the first wall portions of two adjacent battery cells.

2. The battery device according to claim 1, characterized in that: The battery cell further includes an end cap assembly and an electrode assembly, the housing includes an opening on at least one side of the second direction, the electrode assembly is accommodated in the housing, the end cap assembly includes an end cap plate and an electrode terminal connected to each other, the end cap plate covers the opening, the electrode assembly is connected to the electrode terminal, The thermal insulation member further comprises an insulating portion, which is arranged on a side of the end cover plate away from the electrode assembly, and the insulating portion is connected to the first thermal insulation portion at at least one end thereof in the first direction.

3. The battery device according to claim 2, characterized in that: The end cover plate includes a protruding portion and two connecting portions, the two connecting portions are arranged on both sides of the protruding portion in the second direction thereof, the electrode terminal is arranged on the connecting portion, the protruding portion is arranged to protrude relative to the connecting portion in a direction away from the electrode assembly, the second wall portion is connected to the connecting portion, and the first wall portion is connected to the protruding portion. The insulating portion includes a first portion and a second portion connected to each other, the first portion is disposed on the protruding portion, the second portion is disposed on the connecting portion, and the first heat insulating portion is connected to the first portion.

4. The battery device according to claim 1, characterized in that: The heat insulating member further includes a second heat insulating portion, at least a portion of which is disposed between the second wall portions of two adjacent battery cells.

5. The battery device according to claim 4, characterized in that: The first heat insulating portion and the second heat insulating portion are integrally formed, or the first heat insulating portion and the second heat insulating portion are separately formed.

6. The battery device according to claim 5, characterized in that: The first heat insulating part and the second heat insulating part are separately formed and arranged, and are connected to each other.

7. The battery device according to claim 4, characterized in that: The thermal conductivity of the first thermal insulation part is greater than the thermal conductivity of the second thermal insulation part.

8. The battery device according to any one of claims 1 to 7, characterized in that: The first heat insulating portion is arranged to be elastically deformable along the first direction.

9. The battery device according to any one of claims 1 to 7, characterized in that: The first heat insulating portion and at least a portion of the edges of the first wall portion are spaced apart from each other.

10. The battery device according to claim 9, characterized in that: The dimension H1 of the first heat insulating portion in the second direction and the dimension H2 of the first wall portion in the second direction satisfy H2-3mm≤H1<H2, And / or, a dimension L1 of the first heat insulating portion in the third direction and a dimension L2 of the first wall portion in the third direction satisfy L2-3mm≤L1<L2.

11. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 10.

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