Battery device and electric device

Abstract

The utility model provides a battery device and an electric device. The battery device comprises a battery monomer group, a side plate and a heat conduction part, the battery monomer group comprises at least two battery monomers arranged along a first direction so as to improve the capacity of the battery device, the side plate is arranged on at least one side of the battery monomer group in a second direction and is connected with at least part of the battery monomers, and the side plate plays a role in fixing the battery monomers so as to improve the capacity of the battery device. The heat conduction part is arranged between the battery monomer group and the at least one side plate, the heat conduction part can conduct heat, and the side plate can tightly attach the heat conduction part to the battery monomer group, so that the heat conduction part can efficiently conduct the heat of the battery monomers, the temperature of the battery monomer group is balanced, the heat conduction performance of the battery device is enhanced, and the performance of the battery device is improved; the first surface of the side plate is provided with the groove, and the heat conduction part is arranged in the groove, so that the stability of the heat conduction part in the battery device can be improved, the contact area of the heat conduction part and the side plate is increased, and the heat conduction performance of the heat conduction part 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, the internal temperature of the battery device rises during operation. How to improve the thermal conductivity of the battery device to improve the performance of the battery device is an issue that 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 thermal conductivity of the battery device and help improve the performance of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising: a battery cell group, the battery cell group comprising at least two battery cells arranged along a first direction, a side plate, the side plate is arranged on at least one side of the battery cell group in a second direction and connected to at least part of the battery cells, and a heat conductive portion, the heat conductive portion is arranged between the battery cell group and at least one side plate, wherein the side plate comprises a first surface and a groove, the first surface is arranged on a side of the side plate facing the battery cell group, the groove is arranged on the first surface, and at least part of the heat conductive portion is arranged in the groove.

[0006] In the scheme of the embodiment of the present application, the battery device includes a battery cell group, a side plate and a heat conducting part. The battery cell group includes at least two battery cells arranged along a first direction to increase the capacity of the battery device. The side plate is arranged on at least one side of the battery cell group in a second direction and is connected to at least part of the battery cells. The side plate plays a role in fixing the battery cells. The heat conducting part is arranged between the battery cell group and at least one side plate. The heat conducting part can conduct heat. The side plate can make the heat conducting part close to the battery cell group, which helps the heat conducting part to efficiently conduct the heat of the battery cells, so as to balance the temperature of the battery cell group, enhance the thermal conductivity of the battery device, and improve the performance of the battery device.

[0007] In some embodiments, the side plate includes a first surface and a groove, the first surface is arranged on a side of the side plate facing the battery cell group, the groove is arranged on the first surface, and at least part of the heat conductive portion is arranged in the groove.

[0008] In the solution of the embodiment of the present application, a groove is provided on the first surface of the side plate. By disposing the heat conductive part in the groove, the stability of the heat conductive part in the battery device can be improved, and the contact area between the heat conductive part and the side plate can be increased, thereby improving the thermal conductivity of the heat conductive part.

[0009] In some embodiments, the groove extends to both side edges of the side plate in the first direction and / or the third direction, and the first direction, the second direction and the third direction intersect each other.

[0010] In the solution of the embodiment of the present application, the groove extends to the two side edges of the side plate in the first direction and / or the third direction, so that the heat conducting part can fully contact the battery cell group in the first direction and / or the third direction, and a larger area of ​​the heat conducting part can be exposed to the environment, thereby improving the heat conducting efficiency of the heat conducting part, thereby improving the thermal conductivity of the battery device and balancing the temperature of the battery device.

[0011] In some embodiments, the groove bends and extends along a curved path.

[0012] In the solution of the embodiment of the present application, the groove is bent and extended along a curved path to increase the contact area between the heat conducting part and the side plate, thereby improving the thermal conductivity of the heat conducting part.

[0013] In some embodiments, a plurality of grooves are disposed on the first surface at intervals.

[0014] In the solution of the embodiment of the present application, a plurality of grooves are arranged at intervals on the first surface, which not only helps to enhance the structural strength of the side plate, but also can adjust the thermal conductivity of various parts of the battery device to balance the temperature of the battery device.

[0015] In some embodiments, the battery cell group includes a second surface facing the heat conducting portion in the second direction, the second surface includes a middle area and two end areas, the two end areas are respectively arranged on both sides of the middle area in the first direction or the third direction, the first direction, the second direction and the third direction intersect each other, the groove includes a first groove and a second groove, the orthographic projection of the first groove on the second surface is located in the middle area, and the orthographic projection of the second groove on the second surface is located in the end area, the heat conducting portion includes a first sub-heat conducting portion and a second sub-heat conducting portion, the first sub-heat conducting portion is arranged in the first groove, and the second sub-heat conducting portion is arranged in the second groove, wherein the battery device satisfies at least one of the following conditions:

[0016] The thermal conductivity of the first heat-conducting sub-portion is greater than the thermal conductivity of the second heat-conducting sub-portion;

[0017] The volume of the first groove is greater than the volume of the second groove;

[0018] The distance between adjacent first grooves is smaller than the distance between adjacent second grooves.

[0019] In the scheme of the embodiment of the present application, the second surface includes a middle area and two end areas, the two end areas are arranged on both sides of the middle area in the first direction or the third direction thereof, the orthographic projection of the first groove on the second surface is located in the middle area, and the orthographic projection of the second groove on the second surface is located in the end areas, by setting a first groove with a larger volume to accommodate a first sub-heat conductive part with a larger volume, setting a first sub-heat conductive part with a larger thermal conductivity coefficient in the middle area to enhance the thermal conductivity of the middle area, and setting the spacing between adjacent first grooves to be smaller than the spacing between adjacent second grooves, so as to set the middle area and more heat conductive parts for conduction, balance the overall temperature of the battery cell group, and improve the performance of the battery device.

[0020] In some embodiments, the volume of the first groove is greater than the volume of the second groove, the depth of the first groove is greater than the depth of the second groove, and / or the orthographic projection area of ​​the first groove on the second surface is greater than the orthographic projection area of ​​the second groove on the second surface.

[0021] In the solution of the embodiment of the present application, by setting the depth of the first groove to be greater than the depth of the second groove, it is helpful to reduce the thickness of the bottom of the first groove, facilitate heat exchange between the first sub-heat conducting part and the external environment, and / or the orthographic projection area of ​​the first groove on the second surface is greater than the orthographic projection area of ​​the second groove on the second surface, so as to increase the contact area between the first sub-heat conducting part and the battery cell, enhance the heat conduction rate of the first sub-heat conducting part, balance the overall temperature of the battery cell group, and improve the performance of the battery device.

[0022] In some embodiments, the side plate further includes a hollow hole, and the hollow hole penetrates the bottom of the groove along the second direction.

[0023] In the solution of the embodiment of the present application, the side plate also includes a hollow hole, which passes through the bottom of the groove along the second direction, which not only helps the heat transfer between the heat conducting part and the external environment to enhance the thermal conductivity of the battery device, but also helps to save the material cost of the battery device.

[0024] In some embodiments, the heat conducting portion and the side plate are detachably connected.

[0025] In the solution of the embodiment of the present application, the heat conducting part and the side plate are detachably connected to reduce the difficulty of replacing the heat conducting part.

[0026] In some embodiments, the heat conducting portion is elastically deformable along the second direction.

[0027] In the solution of the embodiment of the present application, the elastically deformable heat-conducting portion can absorb the installation errors of the side plate and the battery cell group to improve the stability of the battery cell group.

[0028] In some embodiments, in the same battery cell group, at least two battery cells are thermally connected to the heat conducting portion.

[0029] In the solution of the embodiment of the present application, at least two battery cells in the same battery cell group are thermally connected to the heat conducting portion, which helps to balance the heat distribution of the battery cell group in the first direction and improve the performance of the battery device.

[0030] 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

[0031] 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:

[0032] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0033] Figure 2 is an exploded view of a battery device provided in one embodiment of the present application;

[0034] Figure 3 It is a structural schematic diagram of a battery module provided in one embodiment of the application;

[0035] Figure 4 is an exploded diagram of a battery cell provided in one embodiment of the present application;

[0036] Figure 5 is a partial structural schematic diagram of a battery device provided in one embodiment of the present application;

[0037] Figure 6 is a partial structural schematic diagram of a battery device provided in another embodiment of the present application;

[0038] Figure 7 is an exploded view of a battery device provided in another embodiment of the present application;

[0039] Figure 8 is a top view of a battery device provided by another embodiment of the present application;

[0040] Fig. 9 is an exploded view of a battery device provided in another embodiment of the present application;

[0041] Fig.10 is an end view of a battery device provided by another embodiment of the present application;

[0042] Fig.11 is a structural schematic diagram of a side plate of a battery device provided in another embodiment of the present application;

[0043] Fig.12It is a partial structural schematic diagram of a battery device provided in yet another embodiment of the present application.

[0044] Description of reference numerals:

[0045] 1. Vehicle; 101. Motor; 102. Controller;

[0046] 2. Battery device; 22. Box; 221. First box; 222. Second box; 23. Battery module;

[0047] 3. Battery cells;

[0048] 4. Shell;

[0049] 5. Electrode assembly;

[0050] 6. End cover assembly;

[0051] 71, battery cell group; 72, side plate; 73, heat conduction part; 721, first surface; 722, groove; 711, second surface; 712, middle area; 713, end area; 723, first groove; 724, second groove; 731, first sub-heat conduction part; 732, second sub-heat conduction part; 725, hollow hole;

[0052] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] The temperature of the battery device rises during operation, causing the performance of the battery device to deteriorate.

[0061] In the related art, a battery device includes one or more battery cell groups for providing voltage and capacity. A battery cell group includes multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar. The temperature of the battery cell group rises during operation, causing the overall temperature of the battery device to rise.

[0062] Based on the above problems, an embodiment of the present application provides a battery device, which includes a battery cell group, a side plate and a heat conducting part. The battery cell group includes at least two battery cells arranged along a first direction to increase the capacity of the battery device. The side plate is arranged on at least one side of the battery cell group in a second direction and is connected to at least part of the battery cells. The side plate plays a role in fixing the battery cells. The heat conducting part is arranged between the battery cell group and at least one side plate. The heat conducting part can conduct heat. The side plate can make the heat conducting part close to the battery cell group, which helps the heat conducting part to efficiently conduct the heat of the battery cells, so as to balance the temperature of the battery cell group, enhance the thermal conductivity of the battery device, and improve the performance of the battery device.

[0063] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 .

[0072] Figure 2 A schematic structural diagram of a battery device 2 according to an embodiment of the present application is shown.

[0073] The battery device 2 mentioned in the embodiment of the present application may include one or more battery cell groups 71 for providing voltage and capacity. The battery cell group 71 may include multiple battery cells 3, and the multiple battery cells 3 are connected in series, parallel or mixed through a busbar.

[0074] In some embodiments, the battery cell group 71 is generally formed by arranging a plurality of battery cells 3 .

[0075] As an example, the battery cell group 71 may be a battery module 23, and the battery module 23 is formed by arranging and fixing a plurality of battery cells 3 to form an independent module. As an example, the battery module 23 may be formed by bundling a plurality of battery cells 3 by a cable tie.

[0076] In some embodiments, the battery device 2 may be a battery pack, which includes a case 22 and one or more battery cell groups 71 , wherein the battery cell group 71 is accommodated in the case 22 .

[0077] As an example, the battery cell group 71 may be a battery module 23 , and the battery cell group 71 may be accommodated in the box body 22 by fixing the battery module 23 in the box body 22 .

[0078] As an example, the battery cell group 71 may also be accommodated in the case 22 by directly fixing the plurality of battery cells 3 to the case 22 .

[0079] As an example, the box 22 may include a first box 221 and a second box 222. The first box 221 and the second box 222 are buckled together to form a closed space inside the box 22 to accommodate the battery cell group 71. The closed space here means covered or closed, which may be sealed or unsealed. The first box 221 may be a top cover or a bottom plate.

[0080] As an example, the box body 22 may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 22 to accommodate the battery cell group.

[0081] In some embodiments, the box 22 can be used as part of the chassis structure of the vehicle 1. For example, part of the box 22 can become at least a part of the floor of the vehicle 1, or part of the box 22 can become at least a part of the cross beam and longitudinal beam of the vehicle 1.

[0082] Figure 3 A schematic structural diagram of a battery module 23 according to an embodiment of the present application is shown.

[0083] 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, in parallel, or in mixed series to form a battery module 23. The multiple battery modules 23 are then connected in series, in parallel, or in mixed series to form a whole, and are accommodated in the box 22.

[0084] The multiple battery cells 3 in the battery module 23 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 23 .

[0085] Figure 4 FIG. 1 is an exploded view of a battery cell 3 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 .

[0086] 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.

[0087] The electrode assembly 5 may be a winding structure, a laminated structure, or a mixed structure of winding and laminated structures.

[0088] 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.

[0089] 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.

[0090] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat, or polygonal.

[0091] In some embodiments, the electrode assembly 5 is provided with tabs, which can lead current out of the electrode assembly 5. The tabs include a positive tab and a negative tab.

[0092] The battery cell 3 may include a shell 4. 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 4) or an aluminum-plastic film, etc. 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 5 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.

[0093] 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.

[0094] 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.

[0095] In some embodiments, the electrode terminal can be disposed on the end cap assembly 6 or on the housing 4, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a switching mechanism.

[0096] First, as Figure 2 As shown, the present application provides a battery device 2, which includes a battery cell group 71, a side plate 72 and a heat conductive portion 73. The battery cell group 71 includes at least two battery cells 3 arranged along a first direction X, the side plate 72 is arranged on at least one side of the battery cell group 71 in a second direction Y, and is connected to at least part of the battery cells 3. The heat conductive portion 73 is arranged between the battery cell group 71 and at least one side plate 72.

[0097] In the solution of the embodiment of the present application, the battery device 2 includes a battery cell group 71, a side plate 72 and a heat conducting part 73. The battery cell group 71 includes at least two battery cells 3 arranged along a first direction X to increase the capacity of the battery device 2. The side plate 72 is arranged on at least one side of the battery cell group 71 in the second direction Y and is connected to at least part of the battery cells 3. The side plate 72 plays a role in fixing the battery cells 3. The heat conducting part 73 is arranged between the battery cell group 71 and at least one side plate 72. The heat conducting part 73 can conduct heat. The side plate 72 can make the heat conducting part 73 close to the battery cell group 71, which helps the heat conducting part 73 to efficiently conduct the heat of the battery cells 3, so as to balance the temperature of the battery cell group 71, enhance the thermal conductivity of the battery device 2, and improve the performance of the battery device 2.

[0098] Optionally, the battery device 2 further includes a box body 22 , and the battery cell group 71 , the side plate 72 and the heat conducting part 73 are accommodated in the box body 22 .

[0099] Optionally, the battery device 2 includes one or more battery cell groups 71. When the battery device 2 includes multiple battery cell groups 71, each battery cell group 71 and each independent side plate 72 and independent heat conducting part 73 are arranged in a one-to-one correspondence, that is, each heat conducting part 73 conducts heat only for one battery cell group 71; or each side plate 72 is connected to at least two battery cell groups 71, and one heat conducting part 73 corresponds to at least two battery cell groups 71.

[0100] Exemplarily, the plurality of battery cell groups are arranged in an array along the first direction X and the second direction Y.

[0101] Exemplarily, a single battery cell group 71 , a single side plate 72 and a single heat conducting portion 73 form a battery module 23 , and one or more battery modules 23 are disposed in the box 22 to form the battery device 2 .

[0102] Optionally, the battery cell group 71 includes at least two battery cells 3 arranged along the first direction X. For example, 2, 3, 5, 10, etc. battery cells 3 are arranged along the first direction X. Alternatively, the battery cell group 71 includes multiple columns of battery cells 3 arranged along the second direction Y.

[0103] Optionally, the side plate 72 is connected to the box body 22 and the battery cell group 71 , and the side plate 72 serves to fix the battery cell group 71 .

[0104] Optionally, the side plate 72 is connected to at least two battery cells 3 to increase the contact area between the side plate 72 and the battery cell group 71 .

[0105] Optionally, the side plate 72 is disposed on one side of the battery cell group 71 in the second direction Y; or the side plates 72 are disposed on both sides of the battery cell group 71 in the second direction Y.

[0106] Optionally, the side plate 72 is made of insulating material to improve the insulation performance of the side plate 72 and the battery cell group 71 .

[0107] The heat conducting part 73 is disposed between the battery cell group 71 and the side plate 72 , and has a thermal conductivity greater than that of the side plate 72 and the housing 4 of the battery cell 3 , so that the heat conducting part 73 helps to enhance the thermal conductivity of the battery device 2 .

[0108] Optionally, the heat conducting part 73 includes a metal material or graphite or a phase change material; illustratively, the heat conducting part 73 may be a nano-insulating flexible felt combined with a hydrated phase change filler, and the hydrated phase change filler may be sodium sulfate decahydrate, sodium acetate trihydrate, or the like.

[0109] The heat conducting part 73 is thermally connected to the battery cell 3 and the side plate 72. Specifically, the heat conducting part 73 is directly attached to or abuts against the battery cell 3 and the side plate 72; or the heat conducting part 73 is spaced apart from the battery cell 3 and the side plate 72, and the heat conducting part 73 is indirectly connected to the battery cell 3 and the side plate 72 via a heat conducting medium, which may be air, metal, or heat conducting glue, etc.

[0110] Optionally, the heat conducting part 73 and the battery cell group 71 are insulated from each other. Exemplarily, the heat conducting part 73 is made of an insulating material, or an insulating layer is disposed on the surface of the heat conducting part 73 .

[0111] Optionally, the specific shape and size of the heat conducting portion 73 can be designed by oneself. For example, the heat conducting portion 73 is rectangular or diamond-shaped.

[0112] Optionally, the side plate 72 is connected to the battery cell group 71 , and the side plate 72 and the battery cell group 71 are directly connected by abutment or bonding, or the side plate 72 is indirectly connected to the battery cell group 71 through the heat conducting portion 73 .

[0113] Optionally, the heat conducting part 73 is connected between the side plate 72 and the battery cell group 71 , and the side plate 72 presses against the heat conducting part 73 so that the heat conducting part 73 is closely attached to the battery cell group 71 .

[0114] Optionally, the side plate 72 is disposed on one side of the battery cell group 71 , and the heat conductive part 73 is disposed between the side plate 72 and the battery cell group 71 ; or the side plate 72 is disposed on both sides of the battery cell group 71 , and the heat conductive part 73 is disposed on one side or both sides of the battery cell group 71 .

[0115] Optionally, according to actual usage, the heat conducting part 73 is arranged on the side plate 72 and the battery cell group 71, and the heat conducting part 73 can also be arranged at other positions. For example, the heat conducting part 73 is arranged on the side of the side plate 72 away from the battery cell group 71, and the heat conducting part 73 is arranged on one side or both sides of the battery cell group 71 in its height direction, etc. By increasing the setting area of ​​the heat conducting part 73, the thermal conductivity of the battery cell group 71 is improved.

[0116] In some embodiments, Figure 2 As shown, the heat conducting portion 73 and the side plate 72 are detachably connected.

[0117] In these embodiments, the heat conducting portion 73 and the side plate 72 are detachably connected to reduce the difficulty of replacing the heat conducting portion 73 .

[0118] When the heat conducting portion 73 needs to be replaced or repaired, it can be easily separated from the side plate 72 without large-scale disassembly of the entire battery device 2 .

[0119] Optionally, the heat conducting part 73 and one of the side panels 72 form a slot, and the other of the heat conducting part 73 and the side panel 72 form a block, and the slot and the block cooperate with each other, so that the heat conducting part 73 and the side panel 72 can be relatively moved. When replacement is needed, the heat conducting part 73 can be pulled out from the side panel 72; or the heat conducting part 73 and the side panel 72 are connected by vacuum adsorption, and when the heat conducting part 73 needs to be replaced, air can be injected into the vacuum interface between the heat conducting part 73 and the side panel 72 to complete the separation; or the heat conducting part 73 and the side panel 72 are detachably connected by snap-in connection.

[0120] Optionally, the heat conducting part 73 and the side plate 72 are connected by vacuum adsorption to improve the problem that an air gap is formed between the heat conducting part 73 and the side plate 72 . The air gap has a slow heat conduction rate and affects the overall thermal conductivity of the battery device 2 .

[0121] In some embodiments, Figure 2 As shown, in the same battery cell group 71 , at least two battery cells 3 are thermally connected to the heat conducting portion 73 .

[0122] In these embodiments, at least two battery cells 3 in the same battery cell group 71 are thermally connected to the heat conducting portion 73 , which helps to balance the heat distribution of the battery cell group 71 in the first direction X and improve the performance of the battery device 2 .

[0123] At least two battery cells 3 are connected to the heat conducting part 73, which not only increases the contact area between the heat conducting part 73 and the battery cell group 71 and improves the heat conducting efficiency of the heat conducting part 73, but also balances the temperature of the battery cell group 71 in the first direction X and the temperature of the battery device 2 in the first direction X through the heat conducting effect of the heat conducting part 73.

[0124] Optionally, the heat conducting portion 73 is in contact with each battery cell 3 in the battery cell group 71 , so as to enhance the effect of the heat conducting portion 73 in balancing the temperature of each battery cell 3 .

[0125] In some embodiments, Figure 2 As shown, the side plate 72 includes a first surface 721 and a groove 722 . The first surface 721 is disposed on a side of the side plate 72 facing the battery cell group 71 . The groove 722 is disposed on the first surface 721 . At least a portion of the heat conducting portion 73 is disposed in the groove 722 .

[0126] In these embodiments, a groove 722 is provided on the first surface 721 of the side plate 72. By disposing the heat conducting part 73 in the groove 722, the stability of the heat conducting part 73 can be improved, and the contact area between the heat conducting part 73 and the side plate 72 can be increased, thereby improving the thermal conductivity of the heat conducting part 73.

[0127] Optionally, the thickness of the side plate 72 is H 1 , the depth of groove 722 is H 2 , satisfying 0.5mm≤H 2 ≤H 1 -1mm, when the thickness of the side plate 72 and the depth of the groove 722 meet the above adjustment, the side plate 72 has enough thickness to obtain sufficient structural strength, and the groove 722 can accommodate enough heat conducting parts 73, so that the battery device 2 has better thermal conductivity. Exemplarily, the depth of the groove 722 is 0.5mm, 1mm, 2mm, etc.

[0128] Optionally, the shape and size of the groove 722 can be designed by oneself. For example, the groove 722 is rectangular, curved, circular, etc.

[0129] Optionally, the heat conducting part 73 is completely accommodated in the groove 722, and the dimension of the heat conducting part 73 in the second direction Y is greater than or equal to the depth of the groove 722, so that the heat conducting part 73 and the battery cell group 71 can be in direct contact, thereby improving the heat conduction rate of both; or the dimension of the heat conducting part 73 in the second direction Y is smaller than the depth of the groove 722, which helps to improve the stability of the heat conducting part 73, the side plate 72 and the battery cell group 71 are in direct contact, and the heat conducting part 73 can exchange heat with the battery cell group 71 through the side plate 72.

[0130] In some embodiments, Figure 2 As shown, the heat conducting portion 73 is elastically deformable along the second direction Y.

[0131] In these embodiments, the elastically deformable heat conducting portion 73 can absorb installation errors between the side plate 72 and the battery cell group 71 to improve the stability of the battery cell group 71 .

[0132] Optionally, the heat conducting part 73 is connected to the battery cell group 71 and the side plate 72 along the second direction Y, respectively, so that the heat conducting part 73 is pressed against the battery cell group 71 and the side plate 72 along the second direction Y.

[0133] Optionally, part of the heat conducting portion 73 is disposed outside the groove 722 and elastically abuts against the battery cell group 71 .

[0134] Exemplarily, the heat conducting part 73 may be heat conducting silica gel or heat conducting rubber.

[0135] See also Figure 5 and Figure 6 , Figure 5 is a partial structural schematic 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 another embodiment of the present application.

[0136] In some embodiments, Figure 2 , Figure 5 and Figure 6 As shown, the groove 722 extends to both side edges of the side plate 72 in the first direction X and / or the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0137] In these embodiments, the groove 722 extends to the side edges of the side plate 72 in the first direction X and / or the third direction Z, so that the heat conducting portion 73 can fully contact the battery cell group 71 in the first direction X and / or the third direction Z, and a larger area of ​​the heat conducting portion 73 can be exposed to the environment, thereby improving the heat conducting efficiency of the heat conducting portion 73, thereby improving the thermal conductivity of the battery device 2 and balancing the temperature of the battery device 2.

[0138] The groove 722 extends to the two side edges of the side plate 72 in the first direction X. The groove 722 extends continuously in the first direction X. The size of the groove 722 in the first direction X is the same as the size of the side plate 72 in the first direction X, so that the heat conduction portion 73 fully contacts each battery cell 3 along the first direction X to balance the temperature of the battery cell group 71 in the first direction X.

[0139] Optionally, the battery cell 3 includes an electrode assembly 5, and the electrode ear of the electrode assembly 5 extends out in the third direction Z. In the related art, the temperature of the battery cell 3 is higher at one end close to the electrode ear in the third direction Z. The groove 722 penetrates the edges of the side plate 72 on both sides in the third direction Z. The groove 722 extends continuously in the third direction Z, and its size in the third direction Z is the same as the size of the side plate 72 in the third direction Z, so that the heat conducting part 73 balances the temperature of the battery cell 3 along the third direction Z.

[0140] Optionally, the size of the side plate 72 in the first direction X and / or the third direction Z is greater than or equal to the size of the battery cell group 71 in the first direction X and / or the third direction Z. Then, when the heat conducting part 73 is accommodated in the groove 722, the heat conducting part 73 and each battery cell 3 in the battery cell group 71 can be in full contact.

[0141] Optionally, the groove 722 extends continuously in the first direction X and / or the third direction Z, and the depth of the groove 722 gradually increases from the two ends to the middle of the side plate 72, or the opening area of ​​the groove 722 gradually increases, so that the middle position of the battery cell group 71 with a higher temperature can be connected to the larger volume of the heat conducting part 73.

[0142] See also Figure 7 , Figure 8 , Fig. 9 and Fig.10 , Figure 7 is an exploded view of a battery device provided in another embodiment of the present application; Figure 8 is a top view of a battery device provided by another embodiment of the present application; Fig. 9 is an exploded view of a battery device provided in another embodiment of the present application; Fig.10 This is an end view of a battery device provided in yet another embodiment of the present application.

[0143] In some embodiments, Figures 7 to 10 As shown, a plurality of grooves 722 are disposed at intervals on the first surface 721 .

[0144] In these embodiments, a plurality of grooves 722 are disposed at intervals on the first surface 721 , which not only helps to enhance the structural strength of the side plate 72 , but also can adjust the thermal conductivity of various parts of the battery device 2 to balance the temperature of the battery device 2 .

[0145] Optionally, the shape and size of each groove 722 can be designed by oneself. Exemplarily, the groove 722 is a rectangular groove or a dot-shaped groove, etc.

[0146] Exemplarily, a plurality of grooves 722 extend along the first direction X and are spaced apart along the third direction Z; or a plurality of grooves 722 extend along the third direction Z and are spaced apart along the first direction X; or a plurality of grooves 722 are distributed in an array on the first surface 721 along the first direction X and the third direction Z to balance the temperature of the battery device 2.

[0147] Optionally, the intervals between the grooves 722 can be designed independently. For example, the grooves 722 are evenly distributed at equal intervals to balance the temperature of the battery cell group 71 in the first direction X.

[0148] In some embodiments, Figures 7 to 10As shown, the battery cell group 71 includes a second surface 711 facing the heat conducting portion 73 in the second direction Y, the second surface 711 includes a middle area 712 and two end areas 713, the two end areas 713 are respectively arranged on both sides of the middle area 712 in the first direction X or the third direction Z, the first direction X, the second direction Y and the third direction Z intersect each other, the groove 722 includes a first groove 723 and a second groove 724, the orthographic projection of the first groove 723 on the second surface 711 is located in the middle area 712, and the orthographic projection of the second groove 724 on the second surface 711 is located in the end area 713, the heat conducting portion 73 includes a first sub-heat conducting portion 731 and a second sub-heat conducting portion 732, the first sub-heat conducting portion 731 is arranged in the first groove 723, and the second sub-heat conducting portion 732 is arranged in the second groove 724, wherein the battery device 2 satisfies at least one of the following conditions:

[0149] The thermal conductivity of the first heat-conducting sub-portion 731 is greater than the thermal conductivity of the second heat-conducting sub-portion 732 ;

[0150] The volume of the first groove 723 is greater than the volume of the second groove 724;

[0151] The interval between adjacent first grooves 723 is smaller than the interval between adjacent second grooves 724 .

[0152] In these embodiments, the second surface 711 includes a middle area 712 and two end areas 713, and the two end areas 713 are respectively arranged on both sides of the middle area 712 in the first direction X or the third direction Z. The orthographic projection of the first groove 723 on the second surface 711 is located in the middle area 712, and the orthographic projection of the second groove 724 on the second surface 711 is located in the end areas 713. By providing a larger volume of the first groove 723 to accommodate a larger volume of the first sub-heat conductive portion 731, providing a first sub-heat conductive portion 731 with a larger thermal conductivity coefficient in the middle area 712 to enhance the thermal conductivity of the middle area 712, and providing a spacing between adjacent first grooves 723 smaller than a spacing between adjacent second grooves 724, the middle area 712 and more heat conductive portions 73 are provided for conduction, the overall temperature of the battery cell group 71 is balanced, and the performance of the battery device 2 is improved.

[0153] The second surface 711 includes a middle area 712 and an end area 713, the two end areas 713 are arranged on both sides of the middle area 712 in the first direction X, and the middle area 712 is arranged in the center of the second surface 711 in the first direction X; or the two end areas 713 are arranged on both sides of the middle area 712 in the third direction Z, and the middle area 712 is arranged in the center of the second surface 711 in the third direction Z. The specific sizes of the middle area 712 and the end areas 713 can be designed by yourself. During the operation of the battery cell group 71, the heat accumulated in the middle area 712 is more than that in the end area 713, so the middle area 712 needs to be provided with a heat conductive part 73 with higher thermal conductivity to enhance the thermal conductivity of the middle area 712.

[0154] Exemplarily, the two end regions 713 are disposed on both sides of the middle region 712 in the first direction X, and the first groove 723 and the second groove 724 both extend along the third direction Z; or the two end regions 713 are disposed on both sides of the middle region 712 in the third direction Z, and the first groove 723 and the second groove 724 both extend along the first direction X.

[0155] Optionally, at least one first groove 723 and at least two second grooves 724 are provided on the side panel 72. For example, the number of the first grooves 723 may be 1, 2, 4, 5, etc.; the number of the second grooves 724 may be 2, 4, 5, 10, etc.

[0156] Optionally, the first groove 723 and the second groove 724 have the same shape, size, and spacing between adjacent grooves 722, and the first sub-heat conducting portion 731 and the second sub-heat conducting portion 732 in the groove 722 have the same volume, and the thermal conductivity of the first sub-heat conducting portion 731 is set to be greater than the thermal conductivity of the second sub-heat conducting portion 732 to enhance the thermal conductivity of the heat conducting portion 73 to the middle region 712. Exemplarily, the first sub-heat conducting portion 731 includes a graphene material, and the second sub-heat conducting portion 732 includes a metal-based material such as copper or aluminum.

[0157] Optionally, the first heat-conducting sub-portion 731 and the second heat-conducting sub-portion 732 are made of the same material, the spacing between adjacent grooves 722 is the same, and the volume of the first groove 723 is larger than that of the second groove 724, so that the first groove 723 can accommodate a larger volume of the first heat-conducting sub-portion 731, thereby enhancing the heat conduction capacity of the heat-conducting portion 73 to the middle area 712. Exemplarily, the shapes of the first groove 723 and the second groove 724 can be the same or different.

[0158] Optionally, the first sub-heat conducting portion 731 and the second sub-heat conducting portion 732 are made of the same material, the first groove 723 and the second groove 724 have the same shape and volume, and the spacing between adjacent first grooves 723 is smaller than the spacing between adjacent second grooves 724, so that the middle area 712 can be thermally connected to more or higher density heat conducting portions 73.

[0159] Exemplarily, a first groove 723 and a second groove 724 are provided on the side plate 72, the first sub-heat conducting portion 731 is accommodated in the first groove 723, the second sub-heat conducting portion 732 is accommodated in the second groove 724, the thermal conductivity of the first sub-heat conducting portion 731 is greater than the thermal conductivity of the second sub-heat conducting portion 732, the volume of the first groove 723 is greater than the volume of the second groove 724, and the spacing between adjacent first grooves 723 is smaller than the spacing between adjacent second grooves 724, so as to enhance the thermal conductivity of the middle area 712 and balance the temperature of the middle area 712 and the end area 713.

[0160] In some embodiments, Figures 7 to 10 As shown, the volume of the first groove 723 is greater than the volume of the second groove 724 , the depth of the first groove 723 is greater than the depth of the second groove 724 , and / or the orthographic projection area of ​​the first groove 723 on the second surface 711 is greater than the orthographic projection area of ​​the second groove 724 on the second surface 711 .

[0161] In these embodiments, by setting the depth of the first groove 723 to be greater than the depth of the second groove 724, it is helpful to reduce the bottom thickness of the first groove 723, facilitate heat exchange between the first sub-heat conducting portion 731 and the external environment, and / or the orthographic projection area of ​​the first groove 723 on the second surface 711 is greater than the orthographic projection area of ​​the second groove 724 on the second surface 711, so as to increase the contact area between the first sub-heat conducting portion 731 and the battery cell 3, thereby enhancing the heat conduction rate of the first sub-heat conducting portion 731, balancing the overall temperature of the battery cell group 71, and improving the performance of the battery device 2.

[0162] Optionally, in order to increase the contact area between the heat conducting part 73 and the battery cell group 71, the cross-sectional area of ​​the groove 722 along the second direction Y is the same or gradually decreases. Exemplarily, the groove 722 is a rectangular groove, a cylindrical groove, a conical groove, or the like.

[0163] The first groove 723 and the second groove 724 have the same cross-sectional shape in the second direction Y, and the depth of the first groove 723 is greater than the depth of the second groove 724, then the volume of the first groove 723 is greater than the volume of the second groove 724, and more first sub-heat conducting parts 731 can be accommodated in the first groove 723; or the orthographic projection area of ​​the first groove 723 on the second surface 711 is large, that is, the opening area of ​​the first groove 723 is larger, and when the depths of the first groove 723 and the second groove 724 are the same, the volume of the first groove 723 is larger to accommodate more first sub-heat conducting parts 731.

[0164] Optionally, a first groove 723 is provided on the side plate 72 , and the size of the first groove 723 projected in the second direction Y in the first direction X is the same as that of the middle area 712 , so as to increase the size of the first groove 723 .

[0165] See also Fig.11 , Fig.11 It is a structural schematic diagram of a side plate of a battery device provided in yet another embodiment of the present application.

[0166] In some embodiments, Figure 2 and Fig.11 As shown, the side plate 72 further includes a hollow hole 725 , and the hollow hole 725 passes through the bottom of the groove 722 along the second direction Y.

[0167] In these embodiments, the side plate 72 further includes a hollow hole 725, which penetrates the bottom of the groove 722 along the second direction Y, which not only helps the heat transfer between the heat conducting part 73 and the external environment to enhance the heat conduction efficiency of the heat conducting part 73, but also helps to save the material cost of the battery device.

[0168] Optionally, the shape and size of the hollow hole 725 can be designed by oneself. For example, the hollow hole 725 is rectangular or circular.

[0169] Optionally, one or more hollow holes 725 may be provided at the bottom of a single groove 722. For example, one hollow hole 725 is provided at the bottom of the first groove 723 and the second groove 724 to maintain the structural strength of the bottom portion of the groove.

[0170] Optionally, part of the heat conducting portion 73 is accommodated in the hollow hole 725 to facilitate heat exchange between the heat conducting portion 73 and the external environment.

[0171] See also Fig.12 , Fig.12 It is a partial structural schematic diagram of a battery device provided in yet another embodiment of the present application.

[0172] In some embodiments, Figure 2 and Fig.12 As shown, the groove 722 bends and extends along a curved path.

[0173] In these embodiments, the groove 722 bends and extends along a curved path to increase the contact area between the heat conducting portion 73 and the side plate 72 , thereby improving the heat conducting performance of the heat conducting portion 73 .

[0174] Optionally, the specific curved path of the groove 722 can be designed by oneself. For example, the groove 722 can extend along the shape of Y=sin(x) or Y=cos(x).

[0175] Optionally, a plurality of grooves 722 are arranged at intervals along the third direction Z, which helps to balance the temperature of the battery cell group 71 in the third direction Z.

[0176] In a second aspect, the present application provides an electrical device, comprising the battery device of the embodiment of the first aspect described above.

[0177] In some embodiments, Figures 1 to 12 As shown, the present application provides a battery device 2, which includes a battery cell group 71, a side plate 72 and a heat conducting portion 73. The battery cell group 71 includes at least two battery cells 3 arranged along a first direction X. The side plate 72 is arranged on at least one side of the battery cell group 71 in a second direction Y and is connected to at least part of the battery cells 3. The side plate 72 includes a first surface 721 and a groove 722. The first surface 721 is arranged on the side of the side plate 72 facing the battery cell group 71. The groove 722 is arranged on the first surface 721. At least part of the heat conducting portion 73 is arranged in the groove 722. At least two battery cells 3 are heat-conductively connected to the heat conducting portion 73. The heat conducting portion 73 and the side plate 72 are detachably connected. The side plate 72 also includes a hollow hole 725. The hollow hole 725 passes through the bottom of the groove 722 along the second direction Y. The plurality of grooves 722 are arranged at intervals along the first direction X or the third direction Z. The groove 722 passes through the two side surfaces of the side plate 72 in the first direction X. The battery cell group 71 includes Y faces the second surface 711 of the heat conducting portion 73, the second surface 711 includes a middle area 712 and two end areas 713, the two end areas 713 are respectively arranged on both sides of the middle area 712 in the first direction X or the third direction Z, the groove 722 includes a first groove 723 and a second groove 724, the orthographic projection of the first groove 723 on the second surface 711 is located in the middle area 712, and the orthographic projection of the second groove 724 on the second surface 711 is located in the end area 713, the heat conducting portion 73 includes a first sub-heat conducting portion 731 and a second sub-heat conducting portion 732, the first sub-heat conducting portion 731 is arranged in the first groove 723, and the second sub-heat conducting portion 732 is arranged in the second groove 724, wherein the battery device 2 satisfies at least one of the following conditions: the thermal conductivity of the first sub-heat conducting portion 731 is greater than the thermal conductivity of the second sub-heat conducting portion 732; the volume of the first groove 723 is greater than the volume of the second groove 724; the spacing between adjacent first grooves 723 is less than the spacing between adjacent second grooves 724.

[0178] In these embodiments, the battery device 2 includes a battery cell group 71, a side plate 72 and a heat conducting portion 73. The battery cell group 71 includes at least two battery cells 3 arranged along a first direction X to increase the capacity of the battery cell group 71. The side plate 72 is arranged on at least one side of the battery cell group 71 in a second direction Y and is connected to at least part of the battery cells 3. The side plate 72 serves to fix the battery cells 3. The heat conducting portion 73 is arranged between the battery cell group 71 and at least one side plate 72. The heat conducting portion 73 can conduct heat. The side plate 72 can make the heat conducting portion 73 close to the battery cell group 71, which helps the heat conducting portion 73 to efficiently conduct the heat of the battery cells 3, so as to balance the temperature of the battery cell group 71, enhance the thermal conductivity of the battery device 2, and improve the performance of the battery device 2.

[0179] 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: A battery cell group, the battery cell group comprising at least two battery cells arranged along a first direction, a side plate, the side plate being disposed on at least one side of the battery cell group in the second direction and connected to at least part of the battery cells, and a heat conducting portion, the heat conducting portion being disposed between the battery cell group and at least one of the side plates, The side plate includes a first surface and a groove, wherein the first surface is arranged on a side of the side plate facing the battery cell group, the groove is arranged on the first surface, and at least a part of the heat conducting part is arranged in the groove.

2. The battery device according to claim 1, characterized in that: The groove extends to both side edges of the side plate in the first direction and / or the third direction, and the first direction, the second direction and the third direction intersect each other.

3. The battery device according to claim 1, characterized in that: The groove bends and extends along a curved path.

4. The battery device according to claim 1, characterized in that: A plurality of grooves are arranged at intervals on the first surface.

5. The battery device according to claim 4, characterized in that: The battery cell group includes a second surface facing the heat conducting portion in a second direction, the second surface includes a middle area and two end areas, the two end areas are arranged on both sides of the middle area in the first direction or the third direction, and the first direction, the second direction and the third direction intersect each other. The groove includes a first groove and a second groove, the orthographic projection of the first groove on the second surface is located in the middle area, and the orthographic projection of the second groove on the second surface is located in the end area, the heat conducting part includes a first sub-heat conducting part and a second sub-heat conducting part, the first sub-heat conducting part is arranged in the first groove, and the second sub-heat conducting part is arranged in the second groove, The battery device satisfies at least one of the following conditions: The thermal conductivity of the first heat-conducting sub-portion is greater than the thermal conductivity of the second heat-conducting sub-portion; The volume of the first groove is greater than the volume of the second groove; The distance between adjacent first grooves is smaller than the distance between adjacent second grooves.

6. The battery device according to claim 5, characterized in that: The depth of the first groove is greater than the depth of the second groove, and / or the orthographic projection area of ​​the first groove on the second surface is greater than the orthographic projection area of ​​the second groove on the second surface.

7. The battery device according to claim 1, characterized in that: The side plate further includes a hollow hole, and the hollow hole penetrates through the bottom of the groove along the second direction.

8. The battery device according to any one of claims 1 to 7, characterized in that: The heat conducting part and the side plate are detachably connected.

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

10. The battery device according to any one of claims 1 to 7, characterized in that: In the same battery cell group, at least two battery cells are thermally connected to the heat conducting part.

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

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