Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device, the battery device comprises a plurality of first heat management parts which are arranged at intervals along a first direction, and at least one battery monomer group is arranged between two adjacent first heat management parts; each battery monomer group comprises a plurality of battery monomers arranged along a first direction, the plurality of battery monomers at least comprise a first battery monomer and a second battery monomer, the first battery monomer has a first surface perpendicular to the first direction, the first surface is in heat conduction connection with one of the first heat management parts, and the second battery monomer has a second surface perpendicular to the second direction. The second battery monomer is provided with a second surface perpendicular to the first direction, and the second surface is in heat conduction connection with the other first heat management component; and the size of the battery monomer along the first direction is less than or equal to 35mm. The first heat management component can directly exchange heat with the first battery cell and the second battery cell, so that the heat management efficiency of the first heat management component is relatively high, and the possibility that the temperature of the battery device is out of control can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the battery technology, how to reduce the possibility of temperature runaway of the battery device is a technical problem to be solved. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery device and a power utilization device, which can reduce the possibility of temperature runaway of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising a plurality of first thermal management components, the plurality of first thermal management components are arranged at intervals along a first direction, and at least one battery monomer group is arranged between two adjacent first thermal management components; each battery monomer group comprises a plurality of battery monomers arranged along the first direction, the plurality of battery monomers at least comprising a first battery monomer and a second battery monomer, the first battery monomer has a first surface perpendicular to the first direction, the first surface is in thermal conductive connection with one of the first thermal management components, and the second battery monomer has a second surface perpendicular to the first direction, the second surface is in thermal conductive connection with another first thermal management component; wherein the size of the battery monomer along the first direction is H, and H≤35mm is satisfied.

[0006] In the technical solution, each battery monomer group includes a plurality of battery monomers arranged along a first direction, the plurality of battery monomers includes at least a first battery monomer and a second battery monomer, the first battery monomer has a first surface perpendicular to the first direction, the first surface is in thermal conductive connection with one of the first heat management components, the second battery monomer has a second surface perpendicular to the first direction, the second surface is in thermal conductive connection with another of the first heat management components, the first battery monomer and the second battery monomer have at least one surface in thermal conductive connection with the first heat management components, the first heat management components can directly exchange heat with the first battery monomer and the second battery monomer, so that the heat management efficiency of the first heat management components is high, and the possibility of temperature runaway of the battery device is reduced. Since the heat generated by the middle part of the battery monomer is high, and for the battery monomer group, the heat generated by the battery monomer in the middle part along the first direction is high, by making the size H of the battery monomer along the first direction satisfy H≤35mm, the overall thickness of the battery monomer is small, and the heat conduction path of the battery monomer along the first direction is short, so that the heat dissipation effect of the battery monomer is good, and the possibility of temperature runaway of the battery device is reduced.

[0007] In some embodiments of the present application, 10mm≤H≤35mm.

[0008] In the technical solution, when H is greater than or equal to 10mm, the inside of the battery monomer has a larger space for accommodating the electrode assembly, so that the energy density of the battery monomer is large, which is beneficial to prolong the endurance time of the battery device; when H is less than or equal to 35mm, the overall thickness of the battery monomer is small, and the heat conduction path of the battery monomer along the first direction is short, so that the heat dissipation effect of the battery monomer is good, and the possibility of temperature runaway of the battery device is reduced; therefore, when 10mm≤H≤35mm, the inside of the battery monomer has a larger space for accommodating the electrode assembly, so that the energy density of the battery monomer is large, which is beneficial to prolong the endurance time of the battery device, and the heat conduction path of the battery monomer along the first direction is short, so that the heat dissipation effect of the battery monomer is good, and the possibility of temperature runaway of the battery device is reduced.

[0009] In some embodiments of the present application, each battery monomer group includes N battery monomers arranged along the first direction, and 2≤N≤5.

[0010] In the technical solution, when N is greater than or equal to 2, the battery cells can be arranged more compactly, the number of the first heat management components required is less, and the space occupied by the first heat management components is small, which is beneficial to improve the energy density of the battery device; when N is less than or equal to 5, the thickness of the battery cell group along the first direction is small, the heat conduction path from the middle of the battery cell group along the first direction to the first heat management component is short, and thus the first heat management component can have a high heat management efficiency on the battery cell group and reduce the possibility of temperature runaway of the battery device; therefore, when 2≤N≤5, the battery cells can be arranged more compactly, the space occupied by the first heat management components is small, which is beneficial to improve the energy density of the battery device, and the heat conduction path from the middle of the battery cell group along the first direction to the first heat management component is short, and thus the first heat management component can have a high heat management efficiency on the battery cell group and reduce the possibility of temperature runaway of the battery device.

[0011] In some embodiments of the present application, the first surface is the surface with the largest area of the first battery cell, and / or the second surface is the surface with the largest area of the second battery cell.

[0012] In the technical solution, by making the first surface the surface with the largest area of the first battery cell and / or the second surface the surface with the largest area of the second battery cell, the heat exchange area between the first heat management component and the first battery cell and / or the heat exchange area between the first heat management component and the second battery cell can be large, and thus the heat exchange speed can be improved and the possibility of temperature runaway of the battery device can be reduced.

[0013] In some embodiments of the present application, the battery cell includes a shell and an electrode assembly, the shell forms an accommodation space, and the electrode assembly is located in the accommodation space; each battery cell includes only one electrode assembly.

[0014] In the technical solution, the shell forms an accommodation space, and the electrode assembly is located in the accommodation space, so that the shell can play a protective role on the electrode assembly; by making each battery cell include only one electrode assembly, the space occupancy rate of the electrode assembly in the shell can be higher, and the energy density of the battery cell can be greater.

[0015] In some embodiments of the present application, a plurality of battery cell groups are arranged between two adjacent first heat management components, the plurality of battery cell groups are arranged along a second direction, and the first direction is perpendicular to the second direction.

[0016] By arranging a plurality of battery cell groups between two adjacent first thermal management components in the second direction, the arrangement of the battery cell groups in the battery device is compact, which is conducive to improving the energy density of the battery device, and the first thermal management components can manage the plurality of battery cell groups, so that the number of the first thermal management components is small, the space occupied by the first thermal management components is small, which is conducive to further improving the energy density of the battery device, and the thermal management efficiency of the first thermal management components is high.

[0017] In some embodiments of the present application, the plurality of battery cells in each battery cell group are connected in parallel.

[0018] In the above technical solution, by connecting the plurality of battery cells in each battery cell group in parallel, the capacity of the battery device can be improved without changing the voltage platform of the battery device.

[0019] In some embodiments of the present application, along the first direction, the two battery cell groups located on both sides of the same first thermal management component are connected in series.

[0020] In the above technical solution, by connecting the two battery cell groups located on both sides of the same first thermal management component in series along the first direction, the charging and discharging management of the plurality of battery cell groups can be facilitated.

[0021] In some embodiments of the present application, the first surface is in direct contact with the first thermal management component, and / or the second surface is in direct contact with the first thermal management component.

[0022] In the above technical solution, by making the first surface in direct contact with the first thermal management component, and / or the second surface in direct contact with the first thermal management component, the heat exchange path between the first thermal management component and the first battery cell and / or the second battery cell is shorter, so that the heat exchange speed of the first thermal management component to the first battery cell and / or the second battery cell is faster, the heat exchange efficiency is higher, and the possibility of temperature runaway of the battery device is reduced.

[0023] In some embodiments of the present application, the first surface is adhesively connected to the first thermal management component through a first adhesive layer, and / or the second surface is adhesively connected to the first thermal management component through a second adhesive layer.

[0024] In the technical solution, the first surface and the first thermal management component are connected through the first adhesive layer, and / or the second surface and the first thermal management component are connected through the second adhesive layer, so that the connection strength between the first thermal management component and the first battery cell and / or the second battery cell is higher, the first thermal management component is more closely attached to the first battery cell and / or the second battery cell, and the heat exchange efficiency between the first thermal management component and the first battery cell and / or the second battery cell is improved.

[0025] In some embodiments of the present application, the battery cell includes a shell, an electrode assembly, and an electrode terminal, the shell forms an accommodation space, the electrode assembly is located in the accommodation space, the electrode terminal is arranged on a third surface of the shell and connected with the electrode assembly; the battery device further includes a busbar component connected with the electrode terminal and used to realize electrical connection between the plurality of battery cells; and the battery device further includes a heat dissipation component in thermal conductive connection with at least one of the electrode terminal, the busbar component, and the third surface.

[0026] In the technical solution, the electrode terminal is arranged on the third surface of the shell and connected with the electrode assembly, so that the load can be electrically connected with the electrode assembly through the electrode terminal; the battery device further includes the busbar component connected with the electrode terminal and used to realize electrical connection between the plurality of battery cells, so that the busbar component can realize current confluence of the plurality of battery cells, thereby facilitating charge and discharge management of the plurality of battery cells; and the battery device further includes the heat dissipation component in thermal conductive connection with at least one of the electrode terminal, the busbar component, and the third surface, so that at least one of the electrode terminal, the busbar component, and the third surface can be cooled through the heat dissipation component, thereby reducing the possibility of temperature runaway of the battery device.

[0027] In some embodiments of the present application, the surface of the electrode terminal exposed outside the shell includes a first connection region and a second connection region, the first connection region is connected with the busbar component, and the second connection region is in thermal conductive connection with the heat dissipation component.

[0028] In the technical solution, the surface of the electrode terminal exposed outside the shell includes the first connection region and the second connection region, the first connection region is connected with the busbar component, and the second connection region is in thermal conductive connection with the heat dissipation component, so that the electrode assembly can be electrically connected with the busbar component through the first connection region, the first connection region can be in thermal conductive connection with the heat dissipation component through the busbar component, thereby realizing heat dissipation of the first connection region, and the second connection region can be directly cooled through the heat dissipation component, thereby reducing the possibility of temperature runaway of the battery device.

[0029] In some embodiments of the present application, the shell comprises a fourth surface opposite to the third surface along a third direction, the battery cell comprises a pressure relief mechanism, and the pressure relief mechanism is arranged on the fourth surface of the shell; and the third direction is perpendicular to the first direction.

[0030] In the above technical solution, by arranging the pressure relief mechanism on the fourth surface along the third direction, the pressure relief mechanism is not blocked by the adjacent battery cell, the speed of the pressure relief mechanism after opening is faster, and the possibility of temperature runaway of the battery device is reduced; and the pressure relief mechanism does not occupy the space of the third surface, so that the third surface has more space for accommodating the electrode terminal.

[0031] In some embodiments of the present application, along a direction perpendicular to the third surface, the current collecting component comprises opposite fifth and sixth surfaces, the fifth surface is connected to the electrode terminal, and the sixth surface is thermally connected to the heat dissipation component.

[0032] In the above technical solution, by arranging the current collecting component along a direction perpendicular to the third surface, the current collecting component comprises opposite fifth and sixth surfaces, the fifth surface is connected to the electrode terminal, and the sixth surface is thermally connected to the heat dissipation component, which facilitates the connection of the current collecting component with the electrode terminal and the heat dissipation component.

[0033] In some embodiments of the present application, the heat dissipation component has an accommodation cavity in the interior thereof for accommodating a heat exchange medium.

[0034] In the above technical solution, by arranging the heat dissipation component with an accommodation cavity in the interior thereof for accommodating a heat exchange medium, the heat exchange capacity of the heat dissipation component is higher, which is beneficial to improving the heat exchange efficiency of the heat dissipation component with the electrode terminal and / or the current collecting component.

[0035] In some embodiments of the present application, the battery device further comprises a box body, the battery cell and the current collecting component are accommodated in the box body; and the heat dissipation component is a first box wall of the box body.

[0036] In the above technical solution, by arranging the battery cell and the current collecting component in the box body, the box body can play a protective role on the battery cell and the current collecting component; by arranging the heat dissipation component as the first box wall of the box body, the electrode terminal and / or the current collecting component can dissipate heat through the first box wall, without the need to additionally arrange a heat dissipation component, which can make the structure of the battery device simpler and is beneficial to saving the preparation cost of the battery device.

[0037] In some embodiments of the present application, the battery device further comprises a second heat management component, the second heat management component is arranged outside the first box wall and is thermally connected to the first box wall, and the second heat management component has a flow channel in the interior thereof for accommodating a heat exchange medium.

[0038] In the technical solution, the battery device further comprises a second heat management component, the second heat management component is arranged outside the first box wall and is in heat conduction connection with the first box wall, an internal part of the second heat management component is formed with a flow channel for accommodating a heat exchange medium, the second heat management component can exchange heat with the first box wall, and the heat exchange speed between the first box wall and the electrode terminal and / or the busbar component is faster, and the heat exchange efficiency is higher; the flow channel for accommodating the heat exchange medium can further improve the heat exchange capacity of the second heat management component, and is beneficial to further improve the heat exchange efficiency between the heat dissipation component and the electrode terminal and / or the busbar component; and the second heat management component is arranged outside the first box wall, which can reduce the risk of short circuit of the battery device caused by leakage of the heat exchange medium inside the box, thereby improving the reliability of the battery device.

[0039] In some embodiments of the present application, the outer side surface of the first box wall is formed with a groove, and at least part of the second heat management component is accommodated in the groove.

[0040] In the technical solution, the outer side surface of the first box wall is formed with a groove, and at least part of the second heat management component is accommodated in the groove, so that the first box wall and the second heat management component can share a part of space, and the space utilization rate of the battery device can be improved.

[0041] In some embodiments of the present application, the inner side surface of the first box wall is formed with a convex part corresponding to the position of the groove, and the convex part is in heat conduction connection with at least one of the electrode terminal, the busbar component and the third surface.

[0042] In the technical solution, the inner side surface of the first box wall is formed with a convex part corresponding to the position of the groove, so that the convex part can improve the structural strength of the first box wall, and the convex part is more convenient to connect with at least one of the electrode terminal, the busbar component and the third surface.

[0043] In some embodiments of the present application, in a direction perpendicular to the third surface, the projection area of the electrode terminal of the battery monomer on the third surface is S1, the area of the third surface is S2, and 40%≤S1 / S2≤80% is satisfied.

[0044] In the technical solution, when S1 / S2 is greater than or equal to 40%, the connection area of the electrode terminal and the heat dissipation component is large, the heat dissipation component has a good heat dissipation effect on the electrode terminal, the heat dissipation efficiency is higher, and the risk of temperature runaway of the battery device is reduced; when S1 / S2 is less than or equal to 80%, the heat dissipation component has a sufficient area to connect with the busbar component, so that the heat dissipation component has a good heat dissipation effect on the busbar component, the heat dissipation efficiency is higher, and the risk of temperature runaway of the battery device is reduced; therefore, when the projection area S1 of the electrode terminal of the battery monomer on the third surface and the area S2 of the third surface satisfy 40%≤S1 / S2≤80% in the direction perpendicular to the third surface, the heat dissipation component has a good heat dissipation effect on the electrode terminal, the heat dissipation efficiency is higher, and the heat dissipation component has a good heat dissipation effect on the busbar component, so that the risk of temperature runaway of the battery device is reduced.

[0045] In some embodiments of the present application, the battery monomer includes a shell and an electrode assembly, the shell forms an accommodation space, and the electrode assembly is located in the accommodation space; the battery device further includes a heat conduction member, the heat conduction member is in thermal conduction connection with the shell, the heat conduction coefficient of the heat conduction member is greater than the heat conduction coefficient of the shell, and the first heat management component is in thermal conduction connection with the electrode assembly via the shell and the heat conduction member.

[0046] In the technical solution, the shell forms the accommodation space, and the electrode assembly is located in the accommodation space, so that the shell can play a protective role on the electrode assembly; the battery device further includes the heat conduction member, the heat conduction member is in thermal conduction connection with the shell, the heat conduction coefficient of the heat conduction member is greater than the heat conduction coefficient of the shell, and the first heat management component is in thermal conduction connection with the electrode assembly via the shell and the heat conduction member, so that the heat exchange medium can exchange heat with the electrode assembly, the heat transfer between the electrode assembly and the first heat management component is faster, the heat management efficiency of the first heat management component on the electrode assembly is improved, and the possibility of temperature runaway of the battery device is reduced.

[0047] In some embodiments of the present application, the heat conduction member is in thermal conduction connection with the surface with the largest area of the shell.

[0048] In the technical solution, the heat conduction member is in thermal conduction connection with the surface with the largest area of the shell, so that the heat exchange area between the heat conduction member and the shell is large, the heat exchange speed is improved, and the possibility of temperature runaway of the battery device is reduced.

[0049] In some embodiments of the present application, the heat conduction member is bonded with the shell and / or the first heat management component.

[0050] In the technical solution, the heat conduction member is bonded with the shell and / or the first heat management component, so that the possibility of displacement of the heat conduction member relative to the shell and / or the first heat management component is small, the heat conduction member keeps conducting heat to the battery monomer, and the stability of the overall structure of the battery device is higher.

[0051] In some embodiments of the present application, the heat-conducting member is arranged outside the shell, and at least part of the heat-conducting member is located between the shell and the first heat management component.

[0052] In the above technical solution, by arranging the heat-conducting member outside the shell and locating at least part of the heat-conducting member between the shell and the first heat management component, the heat-conducting member is closer to the first heat management component, and the heat transfer between the heat-conducting member and the first heat management component is faster, which is conducive to further reducing the possibility of temperature runaway of the battery device.

[0053] In some embodiments of the present application, the heat-conducting member is arranged outside the shell, and at least part of the heat-conducting member is located between the shell and the first heat management component.

[0054] In the above technical solution, by arranging the heat-conducting member outside the shell, the heat-conducting member can exchange heat with the electrode assembly through the shell, improving the heat dissipation efficiency of the electrode assembly and reducing the possibility of temperature runaway of the battery device; since adjacent two battery monomers affect each other and generate a large amount of heat, by arranging the heat-conducting member between adjacent two battery monomers in each battery monomer group, the heat-conducting member can quickly conduct the heat between adjacent two battery monomers in each battery monomer group, reducing the possibility of temperature runaway of the battery device.

[0055] In some embodiments of the present application, the heat-conducting member is arranged outside the shell, and at least part of the heat-conducting member is located between the shell and the first heat management component.

[0056] In the above technical solution, by arranging the heat-conducting member outside the shell, the heat-conducting member can exchange heat with the electrode assembly through the shell, improving the heat dissipation efficiency of the electrode assembly and reducing the possibility of temperature runaway of the battery device; since adjacent two battery monomers affect each other and generate a large amount of heat, by arranging the heat-conducting member between adjacent two battery monomers in each battery monomer group, the heat-conducting member can quickly conduct the heat between adjacent two battery monomers in each battery monomer group, reducing the possibility of temperature runaway of the battery device.

[0057] In some embodiments of the present application, the heat-conducting member has a heat conductivity K, and 300 W / (m·K)≤K≤3000 W / (m·K).

[0058] In the technical solution, by making the thermal conductivity of the heat conduction member greater than or equal to 300 W / (m·K), the heat conduction efficiency of the heat conduction member is higher, the heat conduction effect is better, and the heat management efficiency of the heat management component on the battery monomer is improved, thereby reducing the possibility of temperature runaway of the battery device. By making the thermal conductivity of the heat conduction member less than or equal to 3000 W / (m·K), the heat conduction member is easy to prepare. Therefore, by making the thermal conductivity K of the heat conduction member satisfy 300 W / (m·K)≤K≤3000 W / (m·K), the heat conduction efficiency of the heat conduction member is higher, the heat conduction effect is better, the heat management efficiency of the heat management component on the battery monomer is improved, thereby reducing the possibility of temperature runaway of the battery device, and the heat conduction member is easy to prepare.

[0059] In some embodiments of the present application, the material of the heat conduction member includes at least one of metal, graphite, graphene, ceramic, and carbon nanotube.

[0060] In the technical solution, by making the material of the heat conduction member include at least one of metal, graphite, graphene, ceramic, and carbon nanotube, the heat conduction efficiency of the heat conduction member is higher, the heat conduction effect is better, and the heat management efficiency of the first heat management component on the battery monomer is improved, thereby reducing the possibility of temperature runaway of the battery device.

[0061] In some embodiments of the present application, the surface of the heat conduction member is provided with an insulating layer.

[0062] In the technical solution, by making the surface of the heat conduction member provided with an insulating layer, the insulating performance of the heat conduction member is improved, the possibility of short circuit of the battery monomer is reduced, and the possibility of temperature runaway of the battery device is reduced.

[0063] In a second aspect, the present application provides an electric device, comprising the battery device of any one of the above-mentioned schemes, and the battery device is used to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0065] Figure 1 The structural schematic diagram of the vehicle is provided for some embodiments of the present application;

[0066] Figure 2 The explosion structural schematic diagram of the battery device is provided for some embodiments of the present application;

[0067] Figure 3 A perspective view of a battery device according to some embodiments of the present application;

[0068] Figure 4 A perspective view of a battery device according to some embodiments of the present application;

[0069] Figure 5 A perspective view of a battery device according to some embodiments of the present application;

[0070] Figure 6 A perspective view of a battery device according to some embodiments of the present application;

[0071] Figure 7 A perspective view of a battery device according to some embodiments of the present application; Figure 6 A perspective view of a battery device according to some embodiments of the present application; A perspective view of a battery device according to some embodiments of the present application;

[0072] A perspective view of a battery device according to some embodiments of the present application; Figure 8 A perspective view of a battery device according to some embodiments of the present application; Figure 7 A perspective view of a battery device according to some embodiments of the present application; A perspective view of a battery device according to some embodiments of the present application;

[0073] A perspective view of a battery device according to some embodiments of the present application; Figure 9 A perspective view of a battery device according to some embodiments of the present application; Figure 7 A perspective view of a battery device according to some embodiments of the present application; A perspective view of a battery device according to some embodiments of the present application;

[0074] A perspective view of a battery device according to some embodiments of the present application; Figure 10 A perspective view of a battery device according to some embodiments of the present application; A perspective view of a battery device according to some embodiments of the present application;

[0075] A perspective view of a battery device according to some embodiments of the present application; Figure 11 A perspective view of a battery device according to some embodiments of the present application; A perspective view of a battery device according to some embodiments of the present application;

[0076] A perspective view of a battery device according to some embodiments of the present application; Figure 12 A perspective view of a battery device according to some embodiments of the present application; A perspective view of a battery device according to some embodiments of the present application;

[0077] A perspective view of a battery device according to some embodiments of the present application; Figure 13 A perspective view of a battery device according to some embodiments of the present application; A perspective view of a battery device according to some embodiments of the present application;

[0078] A perspective view of a battery device according to some embodiments of the present application; Figure 14 A perspective view of a battery device according to some embodiments of the present application; A perspective view of a battery device according to some embodiments of the present application;

[0079] A perspective view of a battery device according to some embodiments of the present application; Figure 15 A perspective view of a battery device according to some embodiments of the present application; A perspective view of a battery device according to some embodiments of the present application;

[0080] Icon: 1000 - vehicle; 100 - battery device; 10 - case; 11 - first sub case; 12 - second sub case; 110 - first case wall; 111 - recess; 112 - protrusion; 20 - battery cell; 20a - first battery cell; 201 - first surface; 20b - second battery cell; 202 - second surface; 203 - third surface; 204 - fourth surface; 210 - housing; 211 - first wall; 212 - second wall; 213 - third wall; 214 - fourth wall; 215 - fifth wall; 216 - sixth wall; 220 - electrode assembly; 230 - electrode terminal; 231 - first connection region; 232 - second connection region; 240 - third adhesive layer; 250 - pressure relief mechanism; 30 - first thermal management member; 310 - current collector; 40 - bus member; 410 - fifth surface; 420 - sixth surface; 430 - fourth adhesive layer; 50 - second thermal management member; 60 - thermally conductive member; 610 - first portion; 620 - second portion; 630 - third portion; 640 - fourth portion; 650 - fifth portion; 70 - third thermal management member; 200 - controller; 300 - motor; X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0081] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0082] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0083] The terms "first", "second", etc. in the specification and claims of the present application or in the above description of drawings are used to distinguish different objects, rather than to describe a specific order or primary and secondary relationship.

[0084] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0085] The term "and / or" in the present application is merely a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0086] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0087] "Multiple" appearing in the present application means two or more (including two).

[0088] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to use.

[0089] The battery cell includes but is not limited to lithium ion battery, sodium ion battery, sodium lithium ion battery, lithium metal battery, sodium metal battery, lithium sulfur battery, magnesium ion battery, nickel hydrogen battery, nickel cadmium battery, lead-acid battery, etc.

[0090] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0091] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0092] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0093] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0094] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0095] As an example, a battery cell includes an electrode assembly and an electrolyte, the electrode assembly is composed of a positive electrode tab, a negative electrode tab and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive current collector and a positive active material layer, the positive active material layer is coated on the surface of the positive current collector, and the current collector without the positive active material layer is used as the positive electrode lug. Taking a lithium ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer, the negative active material layer is coated on the surface of the negative current collector, and the current collector without the negative active material layer is used as the negative electrode lug. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to ensure that no fuse occurs when passing a large current, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene) or the like.

[0096] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that the inside of the box forms a closed space to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0097] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that the inside of the box forms a closed space to accommodate the battery cell assembly.

[0098] As an example, the box can be part of the chassis structure of the vehicle. For example, the top cover of the box can become at least part of the floor of the vehicle, or the frame of the box can become at least part of the cross beam and the longitudinal beam of the vehicle.

[0099] The battery device has the outstanding advantages of high energy density, small environmental pollution, large power density, long service life, wide adaptation range, small self-discharge coefficient, etc., and is an important part of the development of new energy today. With the development of the new energy industry, the battery device gradually develops towards integration and fast charging.

[0100] However, a large amount of heat is generated in the process of fast charging of the battery device, which causes the internal temperature of the battery device to rise sharply, affects the use performance and service life of the battery device, and there is a possibility of temperature runaway of the battery device.

[0101] Based on the above considerations, the application provides a battery device, which comprises a plurality of first thermal management components, the plurality of first thermal management components are arranged at intervals along a first direction, and at least one battery monomer group is arranged between any two adjacent first thermal management components; each battery monomer group comprises a plurality of battery monomers arranged along the first direction, the plurality of battery monomers comprises at least a first battery monomer and a second battery monomer, the first battery monomer has a first surface perpendicular to the first direction, and the first surface is in thermal conductive connection with one of the first thermal management components; the second battery monomer has a second surface perpendicular to the first direction, and the second surface is in thermal conductive connection with another one of the first thermal management components; wherein the size of the battery monomer along the first direction is H, and H≤35mm is satisfied.

[0102] In the technical scheme of the application, by arranging each battery monomer group to comprise a plurality of battery monomers arranged along the first direction, and the plurality of battery monomers comprising at least a first battery monomer and a second battery monomer, the first battery monomer having a first surface perpendicular to the first direction, and the first surface being in thermal conductive connection with one of the first thermal management components, and the second battery monomer having a second surface perpendicular to the first direction, and the second surface being in thermal conductive connection with another one of the first thermal management components, at least one surface of the first battery monomer and the second battery monomer is in thermal conductive connection with the first thermal management component, the first thermal management component can directly exchange heat with the first battery monomer and the second battery monomer, so that the thermal management efficiency of the first thermal management component is higher, and the possibility of temperature runaway of the battery device is reduced. Since the heat generated by the middle part of the battery monomer is higher, and for the battery monomer group, the heat generated by the battery monomer in the middle part along the first direction is higher, by arranging the size of the battery monomer along the first direction to satisfy H≤35mm, the overall thickness of the battery monomer group can be smaller, the thermal conductive path from the middle part of the battery monomer group along the first direction to the first thermal management component is shorter, so that the thermal management efficiency of the first thermal management component on the battery monomer group is higher, and the possibility of temperature runaway of the battery device is reduced.

[0103] In some embodiments, the battery device refers to an energy storage device, and the energy storage device comprises a box body, at least one side of the box body is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0104] The technical schemes described in the embodiments of the application are applicable to various electric devices using battery monomers and battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., for example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.

[0105] The battery device described in the embodiments of the application is not only limited to the above-described electric devices, but also applicable to all electric devices using battery devices, but for the sake of brevity of description, the following embodiments take a vehicle as an example for illustration.

[0106] Please refer to Figure 1 , Figure 1 The structural diagram of a vehicle is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0107] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0108] Please refer to Figure 2 , Figure 2 The explosion structural diagram of a battery device is provided for some embodiments of the present application. The battery device 100 includes a box body 10 and a battery monomer 20, and the battery monomer 20 is contained in the box body 10. Among them, the box body 10 is used to provide a containing space for the battery monomer 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first sub-box body 11 and a second sub-box body 12, the first sub-box body 11 and the second sub-box body 12 are mutually covered, and the first sub-box body 11 and the second sub-box body 12 jointly define a containing space for containing the battery monomer 20. The first sub-box body 11 can be a hollow structure with one end open, and the second sub-box body 12 can be a plate-shaped structure, which is covered on the open side of the first sub-box body 11 to jointly define the containing space with the first sub-box body 11; the first sub-box body 11 and the second sub-box body 12 can also be hollow structures with one side open, and the open side of the second sub-box body 12 is covered on the open side of the first sub-box body 11.

[0109] In some embodiments, the box body 10 can be a cuboid.

[0110] In other embodiments, the box body 10 can also be a cylinder.

[0111] In some embodiments, the box body 10 can be made of aluminum, aluminum alloy or other metal materials, so that the box body 10 has high stress performance.

[0112] In other embodiments, the box 10 can also be made of non-metallic materials with high strength, such as carbon fiber, hard plastic, etc.

[0113] In the battery device 100, the battery cell 10 can be one or multiple. If the battery cell 10 is multiple, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that some of the multiple battery cells 20 are connected in series and some are connected in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the battery cell group composed of the multiple battery cells 20 is accommodated in the box 10. Of course, the battery cell group can also be in the form that multiple battery cells are first connected in series, in parallel, or in a mixed connection to form a battery cell group module, and then multiple battery cell group modules are connected in series, in parallel, or in a mixed connection to form a whole, which is then accommodated in the box 10. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 20. The current collecting component can be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0114] Please refer to Figure 3 and Figure 4 , Figure 3 a perspective structural schematic diagram of a battery device provided by some embodiments of the present application, Figure 4 a schematic diagram of a part of the structure of a battery device from one perspective provided by some embodiments of the present application.

[0115] Some embodiments of the present application provide a battery device 100, which includes multiple first thermal management components 30, the multiple first thermal management components 30 are arranged at intervals along a first direction X, and at least one battery cell group is arranged between any two adjacent first thermal management components 30. Each battery cell group includes multiple battery cells 20 arranged along the first direction X, and the multiple battery cells 20 at least include a first battery cell 20a and a second battery cell 20b. The first battery cell 20a has a first surface 201 perpendicular to the first direction X, and the first surface 201 is in thermal conductive connection with one of the first thermal management components 30. The second battery cell 20b has a second surface 202 perpendicular to the first direction X, and the second surface 202 is in thermal conductive connection with another one of the first thermal management components 30.

[0116] By arranging each battery monomer group to include a plurality of battery monomers 20 arranged along a first direction X, the plurality of battery monomers 20 includes at least a first battery monomer 20a and a second battery monomer 20b, the first battery monomer 20a has a first surface 201 perpendicular to the first direction X, the first surface 201 is in thermal conductive connection with one of the first thermal management components 30, the second battery monomer 20b has a second surface 202 perpendicular to the first direction X, the second surface 202 is in thermal conductive connection with another first thermal management component 30, so that the first battery monomer 20a and the second battery monomer 20b both have at least one surface in thermal conductive connection with the first thermal management component 30, the first thermal management component 30 can directly exchange heat with the first battery monomer 20a and the second battery monomer 20b, so that the thermal management efficiency of the first thermal management component 30 is high, and the possibility of temperature runaway of the battery device 100 can be reduced.

[0117] In some embodiments, the battery monomer 20 can be a cuboid, so that the plurality of battery monomers 20 can be arranged in a matrix, which is beneficial to improve the energy density of the battery.

[0118] In other embodiments, the battery monomer 20 can also be a flat body or other shapes.

[0119] The battery device 100 will exhibit different electrical cycle performance at different ambient temperatures, and when the ambient temperature is too high or too low, the cycle performance of the battery device 100 will decrease, and even the service life will be shortened. Battery thermal management is a technology that, according to the influence of temperature on the performance of the battery device 100, combines the electrochemical characteristics and heat generation mechanism of the battery device 100, and based on the optimal charging and discharging temperature range of the specific battery device 100, through reasonable design, solves the problem of heat dissipation or temperature runaway caused by the operation of the battery device 100 under high or low temperature conditions, and improves the overall performance of the battery device 100. By setting the thermal management component, the thermal management of the battery device 100 can be realized.

[0120] The first thermal management component 30 has a flow channel inside for accommodating a heat exchange medium. The heat exchange medium can be a liquid or a gas. The liquid can include water, ethanol, etc. The gas can be air. The heat exchange medium can circulate in the flow channel. Thermal management refers to cooling or heating the battery monomer 20. For example, when the battery monomer 20 generates heat or the battery device 100 is in a relatively hot environment, the battery monomer 20 can be cooled. For another example, when the battery device 100 is in a relatively cold environment, the battery monomer 20 can be heated.

[0121] In some embodiments, the size of the battery monomer 20 along the first direction X is H, which satisfies H≤35mm. For example, H can be 35mm, 32mm, 30mm, 25mm, 20mm, 15mm, 10mm, 8mm, 5mm, etc.

[0122] Since the heat generated by the middle part of the battery cell 20 is high, and for the battery cell group, the heat generated by the battery cell 20 in the middle part along the first direction X is high, by making the size H of the battery cell 20 along the first direction X satisfy H≤35mm, the overall thickness of the battery cell can be small, the heat conduction path of the battery cell along the first direction X is short, so that the heat dissipation effect of the battery cell is good, and the possibility of temperature runaway of the battery device 100 is reduced.

[0123] In some embodiments, 10mm≤H≤35mm. For example, H can be 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm or 35mm, etc.

[0124] When H is greater than or equal to 10mm, the inside of the battery cell 20 can have a larger space for accommodating the electrode assembly 220, so that the energy density of the battery cell 20 is large, which is beneficial to prolong the endurance time of the battery device 100; when H is less than or equal to 35mm, the overall thickness of the battery cell can be small, the heat conduction path of the battery cell along the first direction X is short, so that the heat dissipation effect of the battery cell is good, and the possibility of temperature runaway of the battery device 100 is reduced; therefore, when 10mm≤H≤35mm, both the inside of the battery cell 20 can have a larger space for accommodating the electrode assembly 220, so that the energy density of the battery cell 20 is large, which is beneficial to prolong the endurance time of the battery device 100, and the heat conduction path of the battery cell along the first direction X is short, so that the heat dissipation effect of the battery cell is good, and the possibility of temperature runaway of the battery device 100 is reduced.

[0125] In some embodiments, each battery cell group includes N battery cells 20 arranged along the first direction X, and 2≤N≤5. For example, N can be 2, 3 or 5, etc.

[0126] When N is greater than or equal to 2, the battery cells 20 of the battery device 100 can be arranged more compactly, the number of the first thermal management components 30 required is less, and thus the space occupied by the first thermal management components 30 is smaller, which is conducive to improving the energy density of the battery device 100; when N is less than or equal to 5, the thickness of the battery cell group along the first direction X is smaller, the heat conduction path from the middle of the battery cell group along the first direction X to the first thermal management component 30 is shorter, and thus the thermal management efficiency of the first thermal management component on the battery cell group is higher, and the possibility of temperature runaway of the battery device 100 is reduced; therefore, when 2≤N≤5, the battery cells 20 of the battery device 100 can be arranged more compactly, the space occupied by the first thermal management components 30 is smaller, which is conducive to improving the energy density of the battery device 100, and the heat conduction path from the middle of the battery cell group along the first direction X to the first thermal management component 30 is shorter, and thus the thermal management efficiency of the first thermal management component on the battery cell group is higher, and the possibility of temperature runaway of the battery device 100 is reduced.

[0127] In some embodiments, the first surface 201 is the surface with the largest area of the first battery cell 20a, and / or the second surface 202 is the surface with the largest area of the second battery cell 20b.

[0128] By making the first surface 201 the surface with the largest area of the first battery cell 20a, and / or the second surface 202 the surface with the largest area of the second battery cell 20b, the heat exchange area between the first thermal management component 30 and the first battery cell 20a can be larger, and / or the heat exchange area between the first thermal management component 30 and the second battery cell 20b can be larger, and thus the speed of heat exchange can be improved, and the possibility of temperature runaway of the battery device 100 can be reduced. Since the middle of the electrode assembly 220 generates more heat during the operation of the battery cell 20, the heat generated by the middle of the electrode assembly 220 can also be quickly conducted out through the first surface 201 and / or the second surface 201 with the largest area, and thus the temperature gradient between the parts of the battery cell 20 can be reduced, which is conducive to improving the service life of the battery cell 20.

[0129] Please refer to Figure 4 In some embodiments, the battery device 100 includes a plurality of current collectors 310, one current collector 310 is connected to each end of each first thermal management component 30 along the second direction Y, and the current collectors 310 on two first thermal management components 30 adjacent along the first direction X are connected to each other, so that the plurality of first thermal management components 30 are connected through the current collectors 310, and the heat exchange medium can be transported to each first thermal management component 30 through the current collectors 310, which is convenient for the transportation control of the heat exchange medium.

[0130] Please refer to Figure 5 , Figure 5A sectional structure schematic diagram of a battery cell of a battery device provided for some embodiments of the present application.

[0131] In some embodiments, the battery cell 20 comprises a housing 210 and an electrode assembly 220, the housing 210 forms an accommodation space, and the electrode assembly 220 is located in the accommodation space. Each battery cell 20 comprises only one electrode assembly 220.

[0132] The housing 210 forms an accommodation space, and the electrode assembly 220 is located in the accommodation space, so that the housing 210 can play a protective role on the electrode assembly 220; by making each battery cell 20 comprise only one electrode assembly 220, the space occupancy rate of the electrode assembly 220 in the housing 210 can be higher, and the energy density of the battery cell 20 is greater.

[0133] In other embodiments, the battery cell 20 can also comprise a plurality of electrode assemblies 220, and the plurality of electrode assemblies 220 are arranged along the first direction X.

[0134] Please refer to Figure 4 In some embodiments, a plurality of battery cell groups are arranged between the two adjacent first thermal management components 30, and the plurality of battery cell groups are arranged along the second direction Y.

[0135] In some embodiments, the first direction X is perpendicular to the second direction Y.

[0136] By arranging a plurality of battery cell groups between the two adjacent first thermal management components 30, and arranging the plurality of battery cell groups along the second direction Y, the arrangement of the battery cell groups in the battery device 100 can be compact, which is conducive to improving the energy density of the battery device 100, and the first thermal management component 30 can manage the plurality of battery cell groups, so that the number of the first thermal management component 30 is less, the space occupied by the first thermal management component 30 is smaller, which is conducive to further improving the energy density of the battery device 100, and the thermal management efficiency of the first thermal management component 30 is higher.

[0137] In some embodiments, the plurality of battery cells 20 in each battery cell group are connected in parallel.

[0138] By connecting the plurality of battery cells 20 in each battery cell group in parallel, the capacity of the battery device 100 can be improved without changing the voltage platform of the battery device 100.

[0139] In some embodiments, along the first direction X, the two battery cell groups located on both sides of the same first thermal management component 30 are connected in series.

[0140] By connecting the two battery monomer groups on the same first thermal management component 30 in series along the first direction X, the charging and discharging management of the plurality of battery monomer groups can be facilitated.

[0141] In some embodiments, the first surface 201 is in direct contact with the first thermal management component 30, and / or the second surface 202 is in direct contact with the first thermal management component 30.

[0142] By making the first surface 201 in direct contact with the first thermal management component 30, and / or the second surface 202 in direct contact with the first thermal management component 30, the heat exchange path between the first thermal management component 30 and the first battery monomer 20a and / or the second battery monomer 20b can be shortened, so that the first thermal management component 30 exchanges heat with the first battery monomer 20a and / or the second battery monomer 20b faster, and the heat exchange efficiency is higher, reducing the possibility of temperature runaway of the battery device 100.

[0143] In some embodiments, a limiting member or a resilient member (not shown in the figure) can be arranged in the box 10 to limit or provide elasticity to the battery monomer 20 and / or the first thermal management component 30 in the first direction X, so as to maintain the contact between the first surface 201 and the first thermal management component 30, and the contact between the second surface 202 and the first thermal management component 30.

[0144] In other embodiments, the first surface 201 is connected to the first thermal management component 30 by a first adhesive layer, and / or the second surface 202 is connected to the first thermal management component 30 by a second adhesive layer.

[0145] By connecting the first surface 201 to the first thermal management component 30 by the first adhesive layer, and / or connecting the second surface 202 to the first thermal management component 30 by the second adhesive layer, the connection strength between the first thermal management component 30 and the first battery monomer 20a and / or the second battery monomer 20b is higher, and the first thermal management component 30 is more closely attached to the first battery monomer 20a and / or the second battery monomer 20b, which is conducive to improving the heat exchange efficiency between the first thermal management component 30 and the first battery monomer 20a and / or the second battery monomer 20b.

[0146] In some embodiments, the first adhesive layer can be a heat-conducting adhesive, and / or the second adhesive layer can be a heat-conducting adhesive, which can make the heat exchange between the first surface 201 and the first thermal management component 30, and / or the heat exchange between the second surface 202 and the first thermal management component 30 faster and more efficient.

[0147] Please refer to Figure 5 to Figure 10 , Figure 6 a structural schematic diagram of a perspective view of a battery device provided in some embodiments of the present application; Figure 7 ​Figure 6 A cross-sectional view of the battery device along the A-A direction; Figure 8 As shown in FIG. 1, the battery device 100 includes a plurality of battery cells 20, a busbar component 40, and a heat dissipation component 50. Figure 7 A partial enlarged view of the battery device at B; Figure 9 As shown in FIG. 1, the battery device 100 includes a plurality of battery cells 20, a busbar component 40, and a heat dissipation component 50. Figure 7 A partial enlarged view of the battery device at C; Figure 10 A perspective view of a battery cell of the battery device provided by some embodiments of the present application.

[0148] In some embodiments, the battery cell 20 includes a housing 210, an electrode assembly 220, and an electrode terminal 230. The housing 210 forms an accommodation space, the electrode assembly 220 is located in the accommodation space, and the electrode terminal 230 is disposed on a third surface 203 of the housing 210 and connected to the electrode assembly 220.

[0149] In some embodiments, the electrode terminal 230 can be made of a metal material such as copper-plated silver, copper-plated zinc, copper, aluminum, iron, etc., and can serve as a conductor and transmit electrical signals.

[0150] In some embodiments, the electrode terminal 230 can be in the shape of a cuboid.

[0151] In other embodiments, the electrode terminal 230 can also be in the shape of a cylinder, an elliptical cylinder, etc.

[0152] In some embodiments, the electrode assembly 220 is formed by winding a positive electrode tab, a separator, and a negative electrode tab in a stacked manner.

[0153] In other embodiments, the electrode assembly 220 can be formed by stacking a plurality of positive electrode tabs, a plurality of separators, and a plurality of negative electrode tabs.

[0154] In some embodiments, the battery device 100 further includes the busbar component 40, which is connected to the electrode terminal 230 and used to realize electrical connection between the plurality of battery cells 20.

[0155] In some embodiments, the battery device 100 further includes the heat dissipation component, which is in thermal conduction connection with at least one of the electrode terminal 230, the busbar component 40, and the third surface 203.

[0156] By arranging the electrode terminal 230 on the third surface 203 of the shell 210 and connecting the electrode terminal 230 with the electrode assembly 220, the load can be electrically connected with the electrode assembly 220 through the electrode terminal; by arranging the battery device 100 to include the busbar component 40, the busbar component 40 is connected with the electrode terminal 230 and used to realize the electrical connection between the plurality of battery cells 20, so that the busbar component 40 can realize the current confluence of the plurality of battery cells 20, thereby facilitating the charge and discharge management of the plurality of battery cells 20; by further arranging the battery device 100 to include the heat dissipation component, the heat dissipation component is in thermal conduction connection with at least one of the electrode terminal 230, the busbar component 40 and the third surface 203, so that at least one of the electrode terminal 230, the busbar component 40 and the third surface 203 can be cooled through the heat dissipation component, thereby reducing the possibility of temperature runaway of the battery device 100.

[0157] In some embodiments, the surface of the electrode terminal 230 exposed outside the shell 210 includes a first connection area 231 and a second connection area 232, the first connection area 231 is connected with the busbar component 40, and the second connection area 232 is in thermal conduction connection with the heat dissipation component.

[0158] By arranging the surface of the electrode terminal 230 exposed outside the shell 210 to include a first connection area 231 and a second connection area 232, the first connection area 231 is connected with the busbar component 40, and the second connection area 232 is in thermal conduction connection with the heat dissipation component, so that the electrode assembly 220 can be electrically connected with the busbar component 40 through the first connection area 231, the first connection area 231 can be in thermal conduction connection with the heat dissipation component through the busbar component 40, thereby realizing the heat dissipation of the first connection area 231, and the second connection area 232 can be directly cooled through the heat dissipation component, thereby reducing the possibility of temperature runaway of the battery device 100.

[0159] In some embodiments, a third adhesive layer 240 is arranged between the second connection area 232 and the heat dissipation component, so that the connection strength of the electrode terminal 230 and the heat dissipation component is higher, and the electrode terminal 230 and the heat dissipation component are more closely attached, which is conducive to improving the heat exchange efficiency of the electrode terminal 230 and the heat dissipation component.

[0160] In some embodiments, the third adhesive layer 240 can be a thermal conductive glue, which can make the heat exchange speed of the electrode terminal 230 and the heat dissipation component faster and the heat exchange efficiency higher.

[0161] Please refer to Figure 11 , Figure 11 for another perspective of the battery device provided by some embodiments of the present application.

[0162] In some embodiments, the shell 210 comprises a fourth surface 204 opposite to the third surface 203 along a third direction Z, and the battery cell 20 comprises a pressure relief mechanism 250 arranged on the fourth surface 204 of the shell 210. The third direction Z is perpendicular to the first direction X.

[0163] By arranging the pressure relief mechanism 250 on the fourth surface 204 along the third direction Z, the pressure relief mechanism 250 is less likely to be blocked by other components, the speed of the pressure relief mechanism 250 after opening is faster, and the possibility of temperature runaway of the battery device 100 is reduced; and the pressure relief mechanism 250 does not occupy the space of the third surface 203, so that the third surface 203 has more space for arranging the electrode terminal 230.

[0164] In some embodiments, along a direction perpendicular to the third surface 203, the current-conducting component 40 comprises opposite fifth and sixth surfaces 410 and 420, the fifth surface 410 is connected to the electrode terminal 230, and the sixth surface 420 is thermally conductively connected to the heat dissipation component.

[0165] By arranging the current-conducting component 40 to comprise opposite fifth and sixth surfaces 410 and 420 along a direction perpendicular to the third surface 203, the fifth surface 410 is connected to the electrode terminal 230, and the sixth surface 420 is thermally conductively connected to the heat dissipation component, which facilitates the connection of the current-conducting component 40 to the electrode terminal 230 and the heat dissipation component.

[0166] In some embodiments, a fourth adhesive layer 430 is arranged between the sixth surface 420 of the current-conducting component 40 and the heat dissipation component, so that the connection strength of the current-conducting component 40 to the heat dissipation component is higher, and the current-conducting component 40 is more tightly attached to the heat dissipation component, which is conducive to improving the heat exchange efficiency of the current-conducting component 40 and the heat dissipation component.

[0167] In some embodiments, the fourth adhesive layer 430 can be a thermally conductive adhesive, which can make the heat exchange speed of the current-conducting component 40 and the heat dissipation component faster and the heat exchange efficiency higher.

[0168] In other embodiments, the heat dissipation component has an accommodation cavity (not shown in the figure) formed therein for accommodating a heat exchange medium.

[0169] By forming the heat dissipation component with an accommodation cavity for accommodating a heat exchange medium, the heat exchange capacity of the heat dissipation component is higher, which is conducive to improving the heat exchange efficiency of the heat dissipation component and the electrode terminal 230 and / or the current-conducting component 40.

[0170] Please refer to Figure 3 and Figure 9 In some embodiments, the battery device 100 further comprises a box 10, and the battery cell 20 and the current-conducting component 40 are accommodated in the box 10.

[0171] In some embodiments, the heat dissipation component is a first box wall 110 of the box 10.

[0172] By accommodating both the battery monomer 20 and the busbar component 40 in the box 10, the box 10 can protect the battery monomer 20 and the busbar component 40; by making the heat dissipation component the first box wall 110 of the box 10, the electrode terminal 230 and / or the busbar component 40 can dissipate heat through the first box wall 110, without the need to additionally provide a heat dissipation component, which can make the structure of the battery device 100 simpler and help save the manufacturing cost of the battery device 100.

[0173] In other embodiments, the heat dissipation component can be provided on the first box wall 110.

[0174] In some embodiments, the battery device 100 further includes a second heat management component 50, which is provided outside the first box wall 110 and in thermal conductive connection with the first box wall 110, and the inside of the second heat management component 50 is formed with a flow channel for accommodating a heat exchange medium.

[0175] By making the battery device 100 further include the second heat management component 50, which is provided outside the first box wall 110 and in thermal conductive connection with the first box wall 110, and the inside of the second heat management component 50 is formed with a flow channel for accommodating a heat exchange medium, the second heat management component 50 can exchange heat with the first box wall 110, which can make the heat exchange speed of the first box wall 110 with the electrode terminal 230 and / or the busbar component 40 faster and the heat exchange efficiency higher; the flow channel for accommodating the heat exchange medium can further improve the heat exchange capacity of the second heat management component 50, which can further improve the heat exchange efficiency of the heat dissipation component with the electrode terminal 230 and / or the busbar component 40; and the second heat management component 50 is provided outside the first box wall 110, which can reduce the risk of the heat exchange medium leaking inside the box 10 and causing short circuit of the battery device 100, thereby improving the reliability of the battery device 100.

[0176] In some embodiments, the outside surface of the first box wall 110 is formed with a recess 111, and at least part of the second heat management component 50 is accommodated in the recess 111.

[0177] By making the outside surface of the first box wall 110 be formed with the recess 111, and at least part of the second heat management component 50 be accommodated in the recess 111, the first box wall 110 and the second heat management component 50 can share a part of space, which can improve the space utilization of the battery device 100.

[0178] In some embodiments, the inner side of the first box wall 110 is formed with a protrusion 112 at a position corresponding to the groove 111, and the protrusion 112 is in thermal contact with at least one of the electrode terminal 230, the busbar component 40, and the third surface 203.

[0179] By forming the inner side of the first box wall 110 with the protrusion 112 at a position corresponding to the groove 111, the structural strength of the first box wall 110 can be improved, and the connection of the protrusion 112 with at least one of the electrode terminal 230, the busbar component 40, and the third surface 203 is more convenient.

[0180] In some embodiments, a fifth adhesive layer 120 is arranged between the first box wall 110 and the second thermal management component 50, so that the connection strength of the first box wall 110 and the second thermal management component 50 is higher, and the fit of the first box wall 110 and the second thermal management component 50 is more compact, which is conducive to improving the heat exchange efficiency of the first box wall 110 and the second thermal management component 50.

[0181] In some embodiments, the fifth adhesive layer 120 can be a thermal conductive adhesive, which can make the heat exchange speed of the first box wall 110 and the second thermal management component 50 faster and the heat exchange efficiency higher.

[0182] In some embodiments, the projection area of the electrode terminal 230 of the battery monomer 20 on the third surface 203 in a direction perpendicular to the third surface 203 is S1, and the area of the third surface 203 is S2, and 40%≤S1 / S2≤80% is satisfied. For example, S1 / S2 can be 40%, 60%, or 80%, etc.

[0183] When S1 / S2 is greater than or equal to 40%, the connection area of the electrode terminal 230 and the heat dissipation component is larger, so that the heat dissipation effect of the heat dissipation component on the electrode terminal 230 is better, the heat dissipation efficiency is higher, and the risk of temperature runaway of the battery device 100 is reduced; when S1 / S2 is less than or equal to 80%, the heat dissipation component has sufficient area to connect with the busbar component 40, so that the heat dissipation effect of the heat dissipation component on the busbar component 40 is better, the heat dissipation efficiency is higher, and the risk of temperature runaway of the battery device 100 is reduced; therefore, when the projection area S1 of the electrode terminal 230 of the battery monomer 20 on the third surface 203 in a direction perpendicular to the third surface 203, and the area S2 of the third surface 203 satisfy 40%≤S1 / S2≤80%, the heat dissipation effect of the heat dissipation component on the electrode terminal 230 is better, the heat dissipation efficiency is higher, and the heat dissipation effect of the heat dissipation component on the busbar component 40 is better, and the risk of temperature runaway of the battery device 100 is reduced.

[0184] Please refer to Figure 12 and Figure 13 , Figure 12A perspective structural schematic view of a battery cell and a heat conduction member of a battery device provided for another embodiment of the present application; Figure 13 An exploded structural schematic view of a battery cell and a heat conduction member of a battery device provided for another embodiment of the present application.

[0185] In some embodiments, the battery cell 20 comprises a shell 210 and an electrode assembly 220, the shell 210 forms an accommodation space, and the electrode assembly 220 is located in the accommodation space. The battery device 100 further comprises a heat conduction member 60, the heat conduction member 60 is in thermal conduction connection with the shell 210, the heat conduction coefficient of the heat conduction member 60 is greater than the heat conduction coefficient of the shell 210, and the first heat management component 30 is in thermal conduction connection with the electrode assembly 220 via the shell 210 and the heat conduction member 60.

[0186] By forming the accommodation space by the shell 210 and locating the electrode assembly 220 in the accommodation space, the shell 210 can play a protective role on the electrode assembly 220. By further comprising the heat conduction member 60 in the battery device 100, the heat conduction member 60 is in thermal conduction connection with the shell 210, the heat conduction coefficient of the heat conduction member 60 is greater than the heat conduction coefficient of the shell 210, and the first heat management component 30 is in thermal conduction connection with the electrode assembly 220 via the shell 210 and the heat conduction member 60, so that the heat exchange medium can exchange heat with the electrode assembly 220, the heat transfer between the electrode assembly 220 and the first heat management component 30 can be faster, and the heat management efficiency of the first heat management component 30 on the electrode assembly 220 can be improved, thereby reducing the possibility of temperature runaway of the battery device 100.

[0187] In some embodiments, the heat conduction member 60 is in thermal conduction connection with the surface with the largest area of the shell 210.

[0188] By making the heat conduction member 60 in thermal conduction connection with the surface with the largest area of the shell 210, the heat exchange area between the heat conduction member 60 and the shell 210 can be larger, so that the heat exchange speed can be improved, and the possibility of temperature runaway of the battery device 100 can be reduced.

[0189] In some embodiments, the heat conduction member 60 is bonded with the shell 210 and / or the first heat management component 30.

[0190] By making the heat conduction member 60 bonded with the shell 210 and / or the first heat management component 30, the possibility of displacement of the heat conduction member 60 relative to the shell 210 and / or the first heat management component 30 can be smaller, so that the heat conduction member 60 remains in heat conduction with the battery cell 20, and the stability of the overall structure of the battery device 100 is higher.

[0191] In some embodiments, the heat conduction member 60 can be bonded with the shell 210 and / or the first heat management component 30 through a heat conduction adhesive, so that heat can be quickly conducted through the heat conduction adhesive, which is conducive to improving the heat exchange efficiency of the battery cell 20 and the first heat management component 30.

[0192] In some embodiments, the heat-conducting member 60 is arranged outside the shell 210, and at least part of the heat-conducting member 60 is located between the shell 210 and the first thermal management component 30.

[0193] By arranging the heat-conducting member 60 outside the shell 210, and by locating at least part of the heat-conducting member 60 between the shell 210 and the first thermal management component 30, the heat-conducting member 60 is closer to the first thermal management component 30, heat transfer between the heat-conducting member 60 and the first thermal management component 30 is faster, and the possibility of temperature runaway of the battery device 100 is further reduced.

[0194] In some embodiments, the heat-conducting member 60 is arranged outside the shell 210, and the heat-conducting member 60 is arranged between adjacent two battery monomers 20 in each battery monomer group.

[0195] By arranging the heat-conducting member 60 outside the shell 210, the heat-conducting member 60 can exchange heat with the electrode assembly 220 through the shell 210, the heat dissipation efficiency of the electrode assembly 220 is improved, and the possibility of temperature runaway of the battery device 100 is reduced; because adjacent two battery monomers 20 affect each other, the generated heat is high, by arranging the heat-conducting member 60 between adjacent two battery monomers 20 in each battery monomer group, the heat-conducting member 60 can quickly conduct the heat between adjacent two battery monomers 20 in each battery monomer group out, and the possibility of temperature runaway of the battery device 100 is reduced.

[0196] In some embodiments, a plurality of heat-conducting members 60 are arranged, and each of the plurality of heat-conducting members 60 corresponds to one of the battery monomers 20 in the battery monomer group.

[0197] By arranging a plurality of heat-conducting members 60, and by arranging each of the plurality of heat-conducting members 60 corresponding to one of the battery monomers 20 in the battery monomer group, the heat-conducting member 60 can quickly conduct the heat of each of the battery monomers 20 in each battery monomer group out, and the possibility of temperature runaway of the battery device 100 is further reduced.

[0198] For example, at least one surface of each of the battery monomers 20 in the battery device 100 is provided with the heat-conducting member 60.

[0199] For example, for each of the battery monomers 20, the heat-conducting member 60 can be arranged on the surface with the largest area of the battery monomer 20, can be arranged on the two surfaces with the largest area of the battery monomer 20, can be arranged on the surface with the largest area and the surface provided with the electrode terminal of the battery monomer 20, or can coat the six surfaces of the battery monomer 20, etc.

[0200] In some embodiments, the shell 210 comprises a first wall 211 and a second wall 212 oppositely arranged along a first direction X, a third wall 213 and a fourth wall 214 oppositely arranged along a second direction Y. The first direction X is parallel to the thickness direction of the shell 210.

[0201] In some embodiments, the first wall 211 and / or the second wall 212 can be the wall with the largest area of the battery cell 20.

[0202] In some embodiments, the first surface 201 can be the outer surface of the first wall 211 and / or the second wall 212, and the second surface 202 can be the outer surface of the first wall 211 and / or the second wall 212.

[0203] In some embodiments, the heat conduction member 60 comprises a first portion 610, a second portion 620, a third portion 630, and a fourth portion 640. The first portion 610 is arranged on the first wall 211, the second portion 620 is arranged on the second wall 212, the third portion 630 is arranged on the third wall 213, and the fourth portion 640 is arranged on the fourth wall 214.

[0204] Since the middle part of the battery cell 20 generates more heat during the operation of the battery cell 20, by arranging the first portion 610 on the first wall 211 and the second portion 620 on the second wall 212, the heat conduction member 60 can quickly conduct the heat generated by the middle part of the battery cell 20 out, thereby reducing the temperature gradient between the parts of the battery cell 20 and improving the service life of the battery cell 20. By arranging the third portion 630 on the third wall 213 and the fourth portion 640 on the fourth wall 214, the heat of the battery cell 20 can be further transmitted to the third portion 630 and the fourth portion 640, thereby further reducing the temperature gradient between the parts of the battery cell 20 and improving the service life of the battery cell 20.

[0205] Please refer to Figure 10 and Figure 14 , Figure 14 the perspective structural schematic diagram of the battery cell and the heat conduction member of the battery device provided in some other embodiments of the present application.

[0206] In some other embodiments, the shell 210 further comprises a fifth wall 215 and a sixth wall 216 oppositely arranged along a third direction Z, and the electrode terminal 230 is arranged on the fifth wall 215. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The heat conduction member 60 comprises a fifth portion 650 arranged on the sixth wall 216. The heat of the battery cell 20 can be further transmitted to the fifth portion 650, thereby further reducing the temperature gradient between the parts of the battery cell 20 and improving the service life of the battery cell 20.

[0207] Please refer to Figure 15 , Figure 15 A perspective structural schematic diagram of a partial structure of a battery device provided for another embodiment of the present application is shown.

[0208] In some embodiments, the battery device 100 further comprises a third thermal management component 70, which is arranged on the side of the battery monomer 20 opposite to the electrode terminal 230 and is in thermal conduction connection with the shell 210 of the battery monomer 20. The third thermal management component 70 is internally formed with a flow channel for accommodating a heat exchange medium.

[0209] By arranging the third thermal management component 70 on the side of the battery monomer 20 opposite to the electrode terminal 230 and in thermal conduction connection with the shell 210 of the battery monomer 20, and internally forming the third thermal management component 70 with a flow channel for accommodating a heat exchange medium, the third thermal management component 70 can exchange heat with the battery monomer 20, and the possibility of temperature runaway of the battery device 100 can be reduced.

[0210] In some embodiments, the thermal conductivity of the thermal conduction member 60 is K, which satisfies 300 W / (m·K)≤K≤3000 W / (m·K). For example, K can be 300 W / (m·K), 1000 W / (m·K), or 3000 W / (m·K), etc.

[0211] By making the thermal conductivity of the thermal conduction member 60 greater than or equal to 300 W / (m·K), the thermal conduction efficiency of the thermal conduction member 60 can be higher, and the thermal conduction effect is better, which is conducive to improving the thermal management efficiency of the thermal management component on the battery monomer 20, thereby reducing the possibility of temperature runaway of the battery device 100. By making the thermal conductivity of the thermal conduction member 60 less than or equal to 3000 W / (m·K), the preparation of the thermal conduction member 60 can be facilitated. Therefore, by making the thermal conductivity K of the thermal conduction member 60 satisfy 300 W / (m·K)≤K≤3000 W / (m·K), the thermal conduction efficiency of the thermal conduction member 60 can be higher, and the thermal conduction effect is better, which is conducive to improving the thermal management efficiency of the thermal management component on the battery monomer 20, thereby reducing the possibility of temperature runaway of the battery device 100, and the preparation of the thermal conduction member 60 can be facilitated.

[0212] In some embodiments, the material of the thermal conduction member 60 includes at least one of metal, graphite, graphene, ceramic, and carbon nanotube.

[0213] By making the material of the thermal conduction member 60 include at least one of metal, graphite, graphene, ceramic, and carbon nanotube, the thermal conduction efficiency of the thermal conduction member can be higher, and the thermal conduction effect is better, which is conducive to improving the thermal management efficiency of the first thermal management component 30 on the battery monomer 20, thereby reducing the possibility of temperature runaway of the battery device 100.

[0214] In some embodiments, the surface of the heat conducting member 60 is provided with an insulating layer (not shown in the figure).

[0215] By providing the surface of the heat conducting member 60 with an insulating layer, the insulating performance of the heat conducting member 60 can be improved, and the possibility of short circuit of the battery monomer 20 can be reduced, thereby reducing the possibility of temperature runaway of the battery device 100.

[0216] In some embodiments, the material of the insulating layer includes at least one of polyethylene, polypropylene, polyimide, or polyester resin. The insulating effect of the insulating layer can be better, which is conducive to improving the insulating performance of the heat conducting member 60 and further reducing the possibility of short circuit of the battery monomer 20.

[0217] Some embodiments of the present application provide a power consuming device, which includes the battery device 100 of any of the preceding solutions, and the battery device 100 is used to provide electric energy.

[0218] Among them, the power consuming device can be any of the foregoing systems or devices using the battery device 100.

[0219] Please refer to Figure 3 to Figure 9 Some embodiments of the present application provide a battery device 100, which includes a plurality of first heat management components 30 arranged at intervals along a first direction X, a plurality of battery monomer groups are arranged between any two adjacent first heat management components 30, and the plurality of battery monomer groups are arranged along a second direction Y. Each battery monomer group includes two battery monomers 20 arranged along the first direction X, and the two battery monomers 20 include at least a first battery monomer 20a and a second battery monomer 20b. The first battery monomer 20a has a first surface 201 perpendicular to the first direction X, and the first surface 201 is in thermal conductive connection with one of the first heat management components 30. The second battery monomer 20b has a second surface 202 perpendicular to the first direction X, and the second surface 202 is in thermal conductive connection with another of the first heat management components 30. The size of the battery monomer 20 along the first direction X is H, and H≤35mm is satisfied.

[0220] In some embodiments, each battery monomer group includes N battery monomers arranged along the first direction X, and 2≤N≤5. For example, N=2.

[0221] In some embodiments, the surface with the largest area of the first battery monomer 20a is the second surface 202, and the surface with the largest area of the second battery monomer 20b is the second surface 202.

[0222] In some embodiments, the battery monomer 20 includes a shell 210 and an electrode assembly 220, the shell 210 forms an accommodation space, and the electrode assembly 220 is located in the accommodation space; each battery monomer 20 includes only one electrode assembly 220.

[0223] In some embodiments, two battery cells 20 in each battery cell group are connected in parallel.

[0224] In the above technical solution, since the size H of the battery cell 20 along the first direction X is ≤35 mm, each battery cell 20 only includes one electrode assembly 220, so that the heat dissipation path of each battery cell 20 along the first direction X is short, the heat of each electrode assembly 220 can be dissipated through the shell 210, the heat influence between the electrode assemblies 220 of the adjacent two battery cells 20 is smaller, and the heat dissipation efficiency of the battery device 100 is improved; since each battery cell group includes 2-5 battery cells 20 arranged along the first direction X, the overall thickness of the battery cell group is smaller, and the heat inside the battery cell group is more easily dissipated, reducing the possibility of temperature runaway caused by heat accumulation in the battery cell group; since the surface with the largest area of the battery cell 20 is in thermal conductive connection with the first thermal management component 30, the thermal conductive area between the first thermal management component 30 and the first battery cell 20 is larger, and the thermal conduction effect is better; since two battery cells 20 in each battery cell group are connected in parallel, the current passing through each battery cell 20 is smaller, further reducing the heat generated by each battery cell 20 and the possibility of temperature runaway of the battery cell 20. In summary, by connecting two battery cells 20 in each battery cell group in parallel, the heat generated by each battery cell 20 can be reduced, and by arranging 2-5 battery cells 20 in the battery cell group between the two first thermal management components 30 along the first direction X, the size H of the battery cell 20 along the first direction X is ≤35 mm, each battery cell 20 only includes one electrode assembly 220, and the surface with the largest area of the battery cell 20 is in thermal conductive connection with the first thermal management component 30, the heat generated by the electrode assembly 220 of each battery cell 20 can be quickly dissipated through the shell 210 and the first thermal management component 30, thereby making the heat dissipation capacity of the battery device 100 in the present application stronger, which can be applied to high-power and fast charging and discharging.

[0225] In some embodiments, along the first direction X, the two battery cell groups located on both sides of the same first thermal management component 30 are connected in series.

[0226] In some embodiments, the first surface 201 is in direct contact with the first thermal management component 30, and the second surface 202 is in direct contact with the first thermal management component 30.

[0227] In some embodiments, the surface of the electrode terminal 230 exposed outside the shell 210 includes a first connection area 231 and a second connection area 232, the first connection area 231 is connected with the busbar component 40, and the second connection area 232 is in thermal conductive connection with the heat dissipation component through a third adhesive layer 240, and the busbar component 40 is in thermal conductive connection with the heat dissipation component through a fourth adhesive layer 430.

[0228] In some embodiments, the battery device 100 further comprises a box 10, and the battery cell 20 and the busbar component 40 are accommodated in the box 10. The heat dissipation component is a first box wall 110 of the box 10. The battery device 100 further comprises a second thermal management component 50, which is arranged outside the first box wall 110 and is in thermal conduction connection with the first box wall 110 through a fifth adhesive layer 120, and an inner part of the second thermal management component 50 is formed with a flow channel for accommodating a heat exchange medium.

[0229] Please refer to Figure 10 to Figure 13 In some embodiments, the battery device 100 comprises a heat conduction component 60, which is in thermal conduction connection with the shell 210, the heat conduction coefficient of the heat conduction component 60 is greater than that of the shell 210, the heat conduction component 60 is arranged outside the shell 210, and at least part of the heat conduction component 60 is located between the shell 210 and the first thermal management component 30.

[0230] In some embodiments, the shell 210 comprises a first wall 211 and a second wall 212 arranged oppositely along a first direction X, and a third wall 213 and a fourth wall 214 arranged oppositely along a second direction Y. The first direction X is parallel to the thickness direction of the shell 210. The heat conduction component 60 comprises a first part 610, a second part 620, a third part 630 and a fourth part 640, the first part 610 is arranged on the first wall 211, the second part 620 is arranged on the second wall 212, the third part 630 is arranged on the third wall 213, and the fourth part 640 is arranged on the fourth wall 214.

[0231] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0232] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized by, The battery device comprises a plurality of first thermal management components, the plurality of first thermal management components are arranged at intervals along a first direction, and at least one battery cell group is arranged between two adjacent first thermal management components; Each battery cell group comprises a plurality of battery cells arranged along the first direction, the plurality of battery cells at least comprises a first battery cell and a second battery cell, the first battery cell has a first surface perpendicular to the first direction, the first surface is in thermal conductive connection with one of the first thermal management components, and the second battery cell has a second surface perpendicular to the first direction, the second surface is in thermal conductive connection with another one of the first thermal management components; The size of the battery cell along the first direction is H, and H≤35mm is satisfied.

2. The battery device according to claim 1, characterized by 10mm≤H≤35mm.

3. The battery device of claim 1, wherein Each battery cell group comprises N battery cells arranged along the first direction, and 2≤N≤5.

4. The battery device of claim 1, wherein The first surface is the surface with the largest area of the first battery cell, and / or the second surface is the surface with the largest area of the second battery cell.

5. The battery device of claim 1, wherein The battery cell comprises a shell and an electrode assembly, the shell forms an accommodation space, and the electrode assembly is located in the accommodation space. Each battery cell comprises only one electrode assembly.

6. The battery device of claim 1, wherein A plurality of battery cell groups are arranged between two adjacent first thermal management components along a second direction. The first direction is perpendicular to the second direction.

7. The battery device of claim 1, wherein The plurality of battery cells in each battery cell group are connected in parallel.

8. The battery device of claim 1, wherein Along the first direction, two battery cell groups on both sides of the same first thermal management component are connected in series.

9. The battery device of claim 1, wherein, The first surface is in direct contact with the first thermal management component, and / or the second surface is in direct contact with the first thermal management component.

10. The battery device of claim 1, wherein The first surface is connected to the first thermal management component through a first adhesive layer, and / or the second surface is connected to the first thermal management component through a second adhesive layer.

11. The battery device of claim 1, wherein The battery cell comprises a shell, an electrode assembly, and an electrode terminal, the shell forms an accommodation space, the electrode assembly is located in the accommodation space, the electrode terminal is arranged on a third surface of the shell, and is connected to the electrode assembly; The battery device further comprises a current collecting component connected to the electrode terminal and used to realize electrical connection between a plurality of battery cells; The battery device further comprises a heat dissipation component in thermal conductive connection with at least one of the electrode terminal, the current collecting component, and the third surface.

12. The battery device of claim 11, wherein, The surface of the electrode terminal exposed outside the shell comprises a first connection area and a second connection area, the first connection area is connected to the current collecting component, and the second connection area is in thermal conductive connection with the heat dissipation component.

13. The battery device of claim 11, wherein, The shell comprises a fourth surface opposite to the third surface along a third direction, the battery cell comprises a pressure relief mechanism arranged on the fourth surface of the shell; The third direction is perpendicular to the first direction.

14. The battery device of claim 11, wherein, The busbar component includes opposite fifth and sixth surfaces in a direction perpendicular to the third surface, the fifth surface is connected to the electrode terminal, and the sixth surface is thermally connected to the heat dissipation component.

15. The battery device of claim 11, wherein, The heat dissipation component has an accommodation cavity for accommodating a heat exchange medium.

16. The battery device of claim 11, wherein, The battery device further includes a box body, and the battery cell and the busbar component are accommodated in the box body. The heat dissipation component is a first box wall of the box body.

17. The battery device of claim 16, wherein, The battery device further includes a second heat management component, which is arranged outside the first box wall and is thermally connected to the first box wall, and has a flow channel for accommodating a heat exchange medium.

18. The battery device of claim 17, wherein, The first box wall has a groove formed on an outer side thereof, and at least part of the second heat management component is accommodated in the groove.

19. The battery device of claim 18, wherein, The first box wall has a protrusion formed on an inner side thereof corresponding to a position of the groove, and the protrusion is thermally connected to at least one of the electrode terminal, the busbar component and the third surface.

20. The battery device of claim 11, wherein, In a direction perpendicular to the third surface, a projection area of the electrode terminal of the battery cell on the third surface is S1, and an area of the third surface is S2, and 40%≤S1 / S2≤80% is satisfied.

21. The battery device of claim 1, wherein, The battery cell includes a shell and an electrode assembly, the shell forms an accommodation space, and the electrode assembly is located in the accommodation space. The battery device further includes a thermal conduction member, which is thermally connected to the shell, has a thermal conductivity coefficient greater than that of the shell, and is thermally connected to the electrode assembly via the shell and the thermal conduction member.

22. The battery device of claim 21, wherein, The thermal conduction member is thermally connected to a surface of the shell with the largest area.

23. The battery device of claim 21, wherein, The thermal conduction member is bonded to the shell and / or the first heat management component.

24. The battery device of claim 21, wherein, The thermal conduction member is arranged outside the shell, and at least part of the thermal conduction member is located between the shell and the first heat management component.

25. The battery device of claim 21, wherein, The thermal conduction member is arranged outside the shell, and the thermal conduction member is arranged between adjacent two battery cells in each battery cell group.

26. The battery device of claim 21, wherein, The thermal conduction member is arranged in plurality, and each of the plurality of thermal conduction members is arranged one-to-one corresponding to each battery cell in the battery cell group.

27. The battery device of claim 21, wherein, The thermal conduction member has a thermal conductivity coefficient K, and 300 W / (m·K)≤K≤3000 W / (m·K) is satisfied.

28. The battery device of claim 21, wherein, The thermal conduction member is made of one of metal, graphite, graphene, ceramic and carbon nanotube.

29. The battery device of claim 21, wherein, A surface of the thermal conduction member is provided with an insulating layer.

30. An electrical device, comprising: The battery device is used to provide electric energy.

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