Battery device and electric device

Abstract

The present application discloses a battery device and an electric device. The battery device comprises a plurality of battery cells, first busbar components, and a heat dissipation component. Each battery cell comprises a casing, an electrode assembly, and a first electrode terminal. The casing forms an accommodating space, the electrode assembly is located in the accommodating space, and the first electrode terminal is arranged on a first outer end surface of the casing. The first busbar components are connected to the first electrode terminals and are used for achieving electrical connections between different battery cells. The heat dissipation component is thermally conductively connected to the first electrode terminals and / or the first busbar components. The structure can effectively improve the reliability and cycle life of the battery device.

Description

Battery device and electric device TECHNICAL FIELD

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

[0002] With the development of new energy technology, the application of battery device is more and more widely, the battery device has high energy density, high reliability, long service life and green environmental protection to the society, which has been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery replacement stations, engineering manufacturing, intelligent instruments and other aspects, and also promotes the development and research of communication terminal, medical instruments, energy development and other aspects.

[0003] In the battery device technology, how to improve the reliability and cycle life of the battery device is a technical problem to be solved.

[0004] SUMMARY

[0005] The embodiments of the present application provide a battery device and an electric device, which can effectively improve the reliability and cycle life of the battery device.

[0006] In a first aspect, the embodiments of the present application provide a battery device, which comprises a plurality of battery monomers, a first busbar component and a heat dissipation component. The battery monomer comprises a shell, an electrode assembly and a first electrode terminal, the shell forms an accommodation space, the electrode assembly is located in the accommodation space, and the first electrode terminal is arranged on a first outer end surface of the shell; the first busbar component is connected to the first electrode terminal and is used to realize electrical connection between different battery monomers; and the heat dissipation component is in thermal conductive connection with the first electrode terminal and / or the first busbar component.

[0007] In the above technical solution, the heat dissipation component is in thermal conductive connection with the first electrode terminal, so that the heat dissipation component can dissipate heat of the first electrode terminal and reduce the temperature of the first electrode terminal. The heat dissipation component is in thermal conductive connection with the first busbar component, so that the heat dissipation component can dissipate heat of the first busbar component and reduce the temperature of the first busbar component, thereby reducing the temperature of the first electrode terminal connected with the first busbar component. Therefore, the heat dissipation component is in thermal conductive connection with the first electrode terminal and / or the first busbar component, which can reduce the temperature of the first electrode terminal, reduce the heat transferred from the first electrode terminal to the inside of the battery monomer, reduce the influence of the heat of the first electrode terminal on the temperature inside the battery monomer, and thus improve the reliability and cycle life of the battery device.

[0008] In some embodiments, the ratio of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end surface ranges from 0.25 to 0.45 in the direction perpendicular to the first outer end surface.

[0009] In the above technical solution, the ratio of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end face is greater than 0.25, so that the proportion of the first electrode terminal on the first outer end face is not too small, facilitating the assembly of the first electrode terminal in the shell and facilitating the heat dissipation of the heat dissipation component to the first electrode terminal. The ratio of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end face is less than 0.45, so that the proportion of the first electrode terminal on the first outer end face is not too large, leaving more area for the first end face to set other components. Therefore, the ratio of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end face ranges from 0.25 to 0.45, which can balance the heat dissipation of the first electronic terminal and the arrangement of other components.

[0010] In some embodiments, the ratio of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end face ranges from 0.3 to 0.4.

[0011] In the above technical solution, the heat dissipation of the first electronic terminal and the arrangement of other components on the first outer end face can be further balanced.

[0012] In some embodiments, the heat dissipation component is in thermal contact with the first electrode terminal, and the surface of the first electrode terminal exposed outside the shell includes a first connection area and a second connection area, the first connection area is connected with the first bus component, and the second connection area is in thermal contact with the heat dissipation component.

[0013] In the above technical solution, the first electrode terminal includes a first connection area and a second connection area, the first connection area is connected with the first bus component, and the second connection area is in thermal contact with the heat dissipation component, the first connection area facilitates current flow, and the second connection area facilitates heat dissipation.

[0014] In some embodiments, the first direction is perpendicular to the first outer end face, the size of the first outer end face along the second direction is greater than the size along the third direction, the second direction, the third direction and the first direction are perpendicular to each other, and the first connection area is closer to the middle of the first outer end face along the second direction.

[0015] In the above technical solution, the first connection area is closer to the middle of the first outer end face along the second direction, facilitating the arrangement of the first bus component to a position close to the middle of the first outer end face along the second direction.

[0016] In some embodiments, the first outer end face is also provided with a second electrode terminal, and the first connection area is located on the side of the second connection area close to the second electrode terminal.

[0017] In the technical solution, the first connecting region is arranged close to the second electrode terminal, so that the first connecting region and the second electrode terminal are conveniently connected with other electrical connecting members (such as a circuit board).

[0018] In some embodiments, the heat dissipation component is in thermal connection with the first electrode terminal, the first direction is a direction perpendicular to the first outer end surface, the first electrode terminal comprises a second outer end surface facing away from the first outer end surface along the first direction, the second outer end surface comprises a first connecting region and a second connecting region, the first connecting region is connected with the first current collecting component, the second connecting region is in thermal connection with the heat dissipation component, and the first connecting region has an area-to-total-area ratio of 0.3-0.7.

[0019] In the technical solution, the area-to-total-area ratio of the first connecting region is greater than 0.3, so that the first connecting region does not have too small a proportion, and overcurrent can be conveniently met. The area-to-total-area ratio of the first connecting region is less than 0.7, so that the first connecting region does not have too large a proportion, and the second connecting region has a relatively large area, and the first electrode terminal can be conveniently cooled. Therefore, the area-to-total-area ratio of the first connecting region is 0.3-0.7, and overcurrent and cooling of the first electrode terminal can be conveniently met.

[0020] In some embodiments, the heat dissipation component is in thermal connection with the first electrode terminal, the first direction is a direction perpendicular to the first outer end surface, the first electrode terminal comprises a second outer end surface facing away from the first outer end surface along the first direction, the second outer end surface comprises a first connecting region and a second connecting region, the first connecting region is connected with the first current collecting component, the second connecting region is in thermal connection with the heat dissipation component, and the first connecting region has an area-to-total-area ratio of 0.3-0.7.

[0021] In the technical solution, the area-to-total-area ratio of the second connecting region is greater than 0.3, so that the second connecting region does not have too small a proportion, and cooling of the first electrode terminal can be conveniently met. The area-to-total-area ratio of the second connecting region is less than 0.7, so that the second connecting region does not have too large a proportion, and the first connecting region has a relatively large area, and overcurrent of the first electrode terminal can be conveniently met. Therefore, the area-to-total-area ratio of the second connecting region is 0.3-0.7, and overcurrent and cooling of the first electrode terminal can be conveniently met.

[0022] In some embodiments, the heat dissipation component is in thermal contact with the first electrode terminal, the first direction is a direction perpendicular to the first outer end surface, the first electrode terminal comprises a third outer end surface and a fourth outer end surface facing away from the first outer end surface along the first direction, the third outer end surface is connected to the first busbar component, the fourth outer end surface is in thermal contact with the heat dissipation component, and the distance between the third outer end surface and the first outer end surface is greater than the distance between the fourth outer end surface and the first outer end surface.

[0023] In the above technical solution, the third outer end surface is used to meet the current flow of the first electrode terminal, and the fourth outer end surface is used to meet the heat dissipation of the first electrode terminal. The distance between the third outer end surface and the first outer end surface is greater than the distance between the fourth outer end surface and the first outer end surface, that is, the third outer end surface is higher than the fourth outer end surface, so that the first connecting area is connected to the first busbar component, for example, the first connecting area can provide sufficient penetration for welding, facilitating the welding of the first busbar component in the first connecting area. Compared with the third outer end surface, the fourth outer end surface is lower, which is conducive to reducing the space occupation of the first electrode terminal.

[0024] In some embodiments, the ratio of the area of the fourth outer end surface to the area of the first outer end surface ranges from 0.075 to 0.315.

[0025] In the above technical solution, the ratio of the area of the fourth outer end surface to the area of the first outer end surface is greater than 0.075, and the proportion of the fourth outer end surface is not too small, which is conducive to meeting the heat dissipation of the first electrode terminal. The ratio of the area of the fourth outer end surface to the area of the first outer end surface is less than 0.315, and the proportion of the fourth outer end surface is not too large, leaving more area for the first outer end surface to arrange other components, facilitating the arrangement of other components on the first outer end surface. Therefore, the ratio of the area of the fourth outer end surface to the area of the first outer end surface ranges from 0.075 to 0.315, which can balance the heat dissipation of the first electrode terminal and the arrangement of other components on the first outer end surface.

[0026] In some embodiments, the ratio of the area of the fourth outer end surface to the area of the first outer end surface ranges from 0.1 to 0.27.

[0027] In the above technical solution, the ratio of the area of the fourth outer end surface to the area of the first outer end surface ranges from 0.1 to 0.27.

[0028] In some embodiments, along a direction perpendicular to the first outer end surface, the first busbar component comprises opposite first and second surfaces, the first surface is connected to the first electrode terminal, and the second surface is in thermal contact with the heat dissipation component.

[0029] In the technical solution, the first surface is connected to the first electrode terminal, and the second surface is connected to the heat dissipation component in a heat conduction manner, so that the connection of the busbar component to the first electrode terminal and the heat dissipation component is more convenient.

[0030] In some embodiments, an accommodation cavity is formed in the heat dissipation component for accommodating the heat exchange medium.

[0031] In the technical solution, the accommodation cavity can accommodate the heat exchange medium, and a heat dissipation component with high heat dissipation capacity is obtained.

[0032] In some embodiments, the heat dissipation component includes a connecting portion made at least partially of metal material, and the heat dissipation component is connected to the first electrode terminal and / or the first busbar component through insulating heat conductive glue.

[0033] In the technical solution, the heat dissipation component includes a connecting portion made at least partially of metal material, and the heat dissipation component is connected to the first electrode terminal and / or the first busbar component through insulating heat conductive glue.

[0034] In some embodiments, the battery device further includes a box body, and the battery monomer and the first busbar component are accommodated in the box body; and the heat dissipation component is a first box wall of the box body.

[0035] In the technical solution, the heat dissipation component is a first box wall of the box body, that is, the first box wall is in heat conduction with the first electrode terminal and / or the first busbar component, the first electrode terminal is cooled by the first box wall, the number of components is simplified, and the manufacturing cost of the battery device is saved.

[0036] In some embodiments, the battery device further includes a first heat management component, the first heat management component is arranged outside the first box wall and is in heat conduction with the first box wall, and a first flow channel for accommodating a heat exchange medium is formed in the first heat management component.

[0037] In the technical solution, the first heat management component is in heat conduction with the first box wall, so that the first heat management component can exchange heat with the first box wall, thereby adjusting the temperature in the box body and improving the reliability of the battery device.

[0038] The first heat management component is arranged outside the first box wall, that is, the first heat management component is located outside the box body, so that the risk of short circuit of an electrical connection caused by leakage of the heat exchange medium in the box body is reduced, thereby improving the reliability of the battery device.

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

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

[0041] In some embodiments, an inner side surface of the first box wall is formed with a protrusion corresponding to a position of the recess, and the protrusion is in thermal conductive connection with the first electrode terminal and / or the first busbar component.

[0042] In the above technical solution, an inner side surface of the first box wall is formed with a protrusion corresponding to a position of the recess, so that the structure strength of the first box wall can be improved, and meanwhile, the protrusion is in thermal conductive connection with the first electrode terminal and / or the first busbar component, which is more convenient.

[0043] In some embodiments, an inner part of the first box wall is formed with a second flow channel for accommodating a heat exchange medium.

[0044] In the above technical solution, an inner part of the first box wall is formed with a second flow channel for accommodating a heat exchange medium, so that the number of components is simplified, and a heat dissipation component with high heat dissipation capacity can be obtained without additionally arranging the first heat management component.

[0045] In some embodiments, the battery monomer further includes a fifth outer end surface, the second outer end surface and the first outer end surface are located at the same battery monomer and opposite or intersect with each other, and the battery device further includes a second heat management component, the second heat management component is in thermal conductive connection with the second outer end surface.

[0046] In the above technical solution, the second heat management component adjusts the temperature of the battery monomer, so that the reliability of the battery device can be further improved.

[0047] In some embodiments, the fifth outer end surface is an outer end surface with the largest area of the battery monomer.

[0048] In the above technical solution, the fifth outer end surface and the second heat management component have a large heat exchange area, so that the heat exchange efficiency can be improved.

[0049] In a second aspect, the embodiments of the present application further provide a power utilization device, which includes the above battery device and is used for providing electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0051] Fig. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0052] Fig. 2 is a structural schematic diagram of a battery device according to some embodiments of the present application from one perspective;

[0053] Fig. 3 is an exploded schematic diagram of a battery device according to some embodiments of the present application;

[0054] Fig. 4 is an exploded schematic diagram of a battery cell according to some embodiments of the present application;

[0055] Fig. 5 is a structural schematic diagram of a battery device according to some embodiments of the present application from another perspective;

[0056] Fig. 6 is a sectional view of Fig. 5 along A-A;

[0057] Fig. 7 is a schematic diagram of a partial internal structure of a battery device according to some embodiments of the present application from one perspective;

[0058] Fig. 8 is a schematic diagram of a partial internal structure of a battery device according to some embodiments of the present application from another perspective;

[0059] Fig. 9 is a structural schematic diagram of a battery cell according to some embodiments of the present application;

[0060] Fig. 10 is an enlarged view of part A in Fig. 6;

[0061] Fig. 11 is a partial structural schematic diagram of a battery cell according to some embodiments of the present application;

[0062] Fig. 12 is a structural schematic diagram of another embodiment of a heat dissipation component in Fig. 10;

[0063] Fig. 13 is a structural schematic diagram of yet another embodiment of a heat dissipation component in Fig. 10.

[0064] Icon: 100 - battery device; 10 - battery cell; 11 - outer shell; 111 - housing; 112 - end cap; 113 - first outer end face; 114 - fifth outer end face; 12 - electrode assembly; 14a - first electrode terminal; 141 - second outer end face; 1411 - first connection area; 1412 - second connection area; 142 - third outer end face; 143 - fourth outer end face; 14b - second electrode terminal; 20 - box; 21 - first box; 22 - second box; 23 - accommodation space; 24 - first box wall; 241 - groove; 242 - protrusion; 243 - second flow channel; 30 - bus member; 30a - first bus member; 30a1 - first surface; 30a2 - second surface; 30b - second bus member; 70 - first thermal management member; 71 - first flow channel; 80 - heat dissipation member; 81 - accommodation cavity; 90 - second thermal management member; 1000 - vehicle; 200 - motor; 300 - controller; Z - first direction; X - second direction; Y - third direction.

[0065] The accompanying drawings are not drawn to scale. DETAILED DESCRIPTION

[0066] In order to make the objectives, 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, any other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0067] 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 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. The terms "first", "second", and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, rather than to describe a particular order or primary and secondary relationship.

[0068] In the present application, the phrase "embodiment" means that the specific features, structures, or characteristics described in conjunction 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.

[0069] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0070] In the present application, the term "and / or" is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0071] 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, as well as 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.

[0072] "Multiple" appearing in the present application means two or more (including two).

[0073] 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.

[0074] 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.

[0075] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0076] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0077] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0078] In some embodiments, the electrode assembly is in a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0079] In some embodiments, the electrode assembly is in a stacked structure.

[0080] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0081] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments which are stacked, and one positive electrode sheet is clamped between adjacent folded segments.

[0082] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments which are stacked.

[0083] As an example, a plurality of separators can be provided, and each of the plurality of separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0084] As an example, the separators can be continuously provided, and are provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0085] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0086] In some embodiments, the electrode assembly is provided with a tab, and the tab can guide current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0087] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0088] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0089] The battery apparatus 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, in parallel, or in a mixed connection through a busbar component.

[0090] In some embodiments, a battery cell assembly is generally 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 a separate module.

[0091] 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 can include a housing and one or more battery cell assemblies housed in the housing.

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

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

[0095] As an example, the housing can include a first housing and a second housing. The first housing and the second housing are coupled so that an enclosed space is formed inside the housing to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first housing can be a top cover or a bottom plate.

[0096] As an example, the housing can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that an enclosed space is formed inside the housing to accommodate the battery cell assembly.

[0097] As an example, the housing can be part of the chassis structure of a vehicle. For example, the top cover of the housing can be at least part of the floor of the vehicle, or the frame of the housing can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0098] In some embodiments, the battery device refers to an energy storage device, which includes a housing having at least one side provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0099] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, discharge capacity, and charge-discharge rate. In addition, the cycle life and reliability of the battery device also need to be considered.

[0100] In order to realize overcurrent, the electrode terminal extends into the battery monomer to be electrically connected with the electrode assembly, and extends out of the battery monomer to be electrically connected with the busbar component. In this structure, the electrode terminal generates heat during operation, especially in the battery device with large overcurrent demand, the busbar component and the electrode terminal generate a large amount of heat, and the heat conducted to the battery monomer through the electrode terminal can increase the working temperature of the internal components of the battery monomer, reduce the cycle life and reliability of the battery device.

[0101] In view of this, in order to solve the problem that the heat conducted to the battery monomer through the electrode terminal can increase the working temperature of the internal components of the battery monomer, reduce the cycle life and reliability of the battery device, the technical scheme provided by the embodiments of the present application is provided, in which the heat dissipation component is in heat conduction connection with the electrode terminal and / or the busbar component.

[0102] The heat dissipation component is in heat conduction connection with the electrode terminal, so that the heat dissipation component can dissipate heat of the electrode terminal and reduce the temperature of the electrode terminal. The heat dissipation component is in heat conduction connection with the busbar component, so that the heat dissipation component can dissipate heat of the busbar component and reduce the temperature of the busbar component, thereby reducing the temperature of the electrode terminal connected with the busbar component. Therefore, the heat dissipation component in heat conduction connection with the electrode terminal and / or the busbar component can reduce the temperature of the electrode terminal, reduce the heat transferred to the internal components of the battery monomer by the electrode terminal, reduce the influence of the heat generated by the electrode terminal on the temperature of the internal components of the battery monomer, and thus improve the reliability and cycle life of the battery.

[0103] The technical scheme described in the embodiments of the present application is applicable to various electric devices using battery monomers and battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, such as spacecraft including airplanes, rockets, space shuttles and spacecraft.

[0104] The following embodiments are described for convenience of description, taking the electric device as a vehicle 1000 as an example.

[0105] Please refer to FIG. 1, which is a structural schematic diagram of the vehicle 1000 provided by some embodiments of the present application. 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.

[0106] The vehicle 1000 can also include a controller 300 and a motor 200, and the controller 300 is used to control the battery device 100 to supply power to the motor 200, for example, to meet the 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 serve as the power source for operating the vehicle 1000, but also serve as the driving power source for the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0108] FIG. 2 is a structural schematic diagram of the battery device 100 from one perspective according to some embodiments of the present application; and FIG. 3 is an exploded schematic diagram of the battery device 100 according to some embodiments of the present application.

[0109] Referring to FIGS. 2 and 3, the battery device 100 can include a box 20 and a plurality of battery cells 10, and the box 20 is configured to accommodate the plurality of battery cells 10.

[0110] The box 20 has an accommodation space 23 formed inside for accommodating the plurality of battery cells 10. The box 20 can have various structures. In some embodiments, the box 20 can include a first box 21 and a second box 22, and the first box 21 and the second box 22 are coupled to each other. The first box 21 and the second box 22 can have various shapes, such as a cuboid, a cylinder, etc. The first box 21 can be a hollow structure with one side open, and the second box 22 can also be a hollow structure with one side open. The open side of the second box 22 is coupled to the open side of the first box 21, and thus the box 20 with a closed space is formed. Alternatively, the first box 21 can be a hollow structure with one side open, and the second box 22 can be a plate structure. The second box 22 is coupled to the open side of the first box 21, and thus the box 20 with the accommodation space 23 is formed.

[0111] In the battery device 100, the battery cells 10 can be one or a plurality of battery cells. If the battery cells 10 are a plurality of battery cells, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 10 are connected in series and in parallel. The plurality of battery cells 10 can be connected in series, in parallel, or in a mixed connection to form a battery module, and the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 20. Alternatively, all the battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and the whole formed by the battery cells 10 is accommodated in the box 20.

[0112] In some embodiments, the battery device 100 can further include a busbar component 30, and the plurality of battery cells 10 can be electrically connected through the busbar component 30 to achieve the series connection, the parallel connection, or the mixed connection of the plurality of battery cells 10. The busbar component 30 can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0113] Referring to FIG. 4, which is an exploded schematic diagram of the battery cell 10 according to some embodiments of the present application, the battery cell 10 can include a shell 111, an electrode assembly 12, an end cover 112, an electrode terminal, and other functional components.

[0114] The housing 111 and the end cover 112 jointly form the outer shell 11 of the battery cell 10.

[0115] The housing 111 is a component for accommodating the electrode assembly 12. The housing 111 can be a hollow structure with an opening formed at one end, or a hollow structure with openings formed at both ends. The material of the housing 111 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The housing 111 can be various shapes, such as a cylinder, a cuboid, etc. For example, in FIG. 3, the housing 111 is a cuboid.

[0116] The end cover 112 is a component that covers the opening of the housing 111 to isolate the internal environment of the battery cell 10 from the external environment. The end cover 112 covers the opening of the housing 111, and the end cover 112 and the housing 111 jointly define a sealed space for accommodating the electrode assembly 12, the electrolyte, and other functional components. The shape of the end cover 112 can be adapted to the shape of the housing 111, such as the housing 111 being a cuboid structure and the end cover 112 being a rectangular plate structure adapted to the housing 111, or the housing 111 being a cylindrical structure and the end cover 112 being a circular plate structure adapted to the housing 111. The material of the end cover 112 can also be various, for example, the end cover 112 can be a metal material, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cover 112 can be the same as or different from the material of the housing 111.

[0117] In the battery cell 10, the end cover 112 can be one or two. If the housing 111 is a hollow structure with an opening formed at one end, one end cover 112 is correspondingly provided; if the housing 111 is a hollow structure with openings formed at both ends, two end covers 112 are correspondingly provided, and the two end covers 112 cover the two openings of the housing 111, respectively.

[0118] The electrode terminal is a component for leading out current, and the electrode terminal can be provided on the end cover 112. The electrode terminal can be provided in two, which are the first electrode terminal 14a and the second electrode terminal 14b, and the two electrode terminals are opposite in polarity. If the first electrode terminal 14a is a positive electrode terminal, the second electrode terminal 14b is a negative electrode terminal; if the first electrode terminal 14a is a negative electrode terminal, the second electrode terminal 14b is a positive electrode terminal.

[0119] The embodiment of the present application provides a battery device 100, which can improve the cycle life and reliability of the battery device 100. The specific structure of the battery device 100 is described in detail below in combination with the drawings.

[0120] FIG. 5 is a structural schematic diagram of another perspective view of the battery device 100 according to some embodiments of the present application; FIG. 6 is a sectional view of FIG. 5 along A-A; FIG. 7 is a schematic diagram of a partial internal structure of the battery device 100 according to some embodiments of the present application from one perspective; FIG. 8 is a schematic diagram of a partial internal structure of the battery device 100 according to some embodiments of the present application from another perspective; FIG. 9 is a structural schematic diagram of the battery cell 10 according to some embodiments of the present application; and FIG. 10 is an enlarged view of portion A in FIG. 6.

[0121] Referring to FIGS. 5 to 10, the present application provides a battery device 100, which includes a plurality of battery cells 10, a first bus member 30a, and a heat dissipation member 80. The battery cell 10 includes a housing 11, an electrode assembly 12, and a first electrode terminal 14a, the housing 11 forms an accommodation space 23, the electrode assembly 12 is located in the accommodation space 23, and the first electrode terminal 14a is provided on a first outer end surface 113 of the housing 11. The first bus member 30a is connected to the first electrode terminal 14a and is used to realize electrical connection between different battery cells 10. The heat dissipation member 80 is in thermal conduction connection with the first electrode terminal 14a and / or the first bus member 30a.

[0122] The first outer end surface 113 is an outer surface of a wall portion of the housing 11. In some embodiments, the first outer end surface 113 can be an outer surface of the end cover 112. In other embodiments, the first outer end surface 113 can also be an outer surface of a side wall of the shell 111 or an outer surface of a bottom wall of the shell 111.

[0123] The first electrode terminal 14a can be a positive electrode terminal, and the first electrode terminal 14a can also be a negative electrode terminal.

[0124] The heat dissipation member 80 is a member for dissipating heat from the first electrode terminal 14a. The heat dissipation member 80 can be a wall portion of the box 20 (as shown in FIG. 10), the heat dissipation member 80 can also be a cooling plate accommodated in the box 20 (as shown in FIG. 12), and the heat dissipation member 80 can also be a heat dissipation fin or the like (not shown in the figures).

[0125] The heat dissipation member 80 can be in thermal conduction connection with only the first electrode terminal 14a, the heat dissipation member 80 can be in thermal conduction connection with only the first bus member 30a, and the heat dissipation member 80 can also be in thermal conduction connection with both the first electrode terminal 14a and the first bus member 30a.

[0126] The heat dissipation member 80 can be in thermal conduction connection with the first electrode terminal 14a in various ways, as long as heat exchange between the first electrode terminal 14a and the heat dissipation member 80 is achieved. The first electrode terminal 14a can be in direct contact with the heat dissipation member 80. In order to improve the thermal conduction efficiency, a material or a member with high thermal conductivity, such as a thermal conduction pad, a thermal conduction glue, or the like, can be provided between the first electrode terminal 14a and the heat dissipation member 80.

[0127] The heat conduction connection between the heat dissipation component 80 and the first bus component 30a can be various, as long as heat exchange between the first bus component 30a and the heat dissipation component 80 is achieved. The first bus component 30a can be in direct contact with the heat dissipation component 80. In order to improve the heat conduction efficiency, a material or component with high heat conduction coefficient, such as a heat conduction pad or heat conduction glue, can be arranged between the first bus component 30a and the heat dissipation component 80.

[0128] The material of the heat dissipation component 80 includes but is not limited to metal, plastic, etc., as long as the heat dissipation of the first electrode terminal 14a is achieved.

[0129] In the above technical solution, the heat dissipation component 80 is in heat conduction connection with the first electrode terminal 14a, and the heat dissipation component 80 can dissipate heat of the first electrode terminal 14a to reduce the temperature of the first electrode terminal 14a. The heat dissipation component 80 is in heat conduction connection with the first bus component 30a, and the heat dissipation component 80 can dissipate heat of the first bus component 30a to reduce the temperature of the first bus component 30a, thereby reducing the temperature of the first electrode terminal 14a connected with the first bus component 30a. Therefore, the heat dissipation component 80 in heat conduction connection with the first electrode terminal 14a and / or the first bus component 30a can reduce the temperature of the first electrode terminal 14a, reduce the heat transferred by the first electrode terminal 14a to the inside of the battery monomer 10, and reduce the influence of the heat generation of the first electrode terminal 14a on the temperature inside the battery monomer 10, thereby improving the reliability and cycle life of the battery device 100.

[0130] In some embodiments, the ratio of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end surface 113 in the direction perpendicular to the first outer end surface 113 is in the range of 0.25-0.45.

[0131] The maximum cross-sectional area of the first electrode terminal 14a refers to the area of the largest cross section of the first electrode terminal 14a in the direction perpendicular to the first outer end surface 113. The larger the maximum cross-sectional area of the first electrode terminal 14a, the larger the occupied area of the first electrode terminal 14a.

[0132] For example, the ratio of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end surface 113 can be 0.25, 0.27, 0.3, 0.33, 0.35, 0.37, 0.38, 0.39, 0.4, 0.42, 0.44, 0.45, and any value therebetween.

[0133] In the above technical solution, the ratio of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end surface 113 is greater than 0.25, so that the proportion of the first electrode terminal 14a on the first outer end surface 113 is not too small, facilitating assembly of the first electrode terminal 14a to the shell 11 and facilitating heat dissipation of the heat dissipation component 80 to the first electrode terminal 14a. The ratio of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end surface 113 is less than 0.45, so that the proportion of the first electrode terminal 14a on the first outer end surface 113 is not too large, leaving more area for the first end surface to be provided with other components. Therefore, the ratio of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end surface 113 ranges from 0.25 to 0.45, which can balance the heat dissipation of the first electrode terminal and the arrangement of other components.

[0134] In some embodiments, the ratio of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end surface 113 ranges from 0.3 to 0.4. The heat dissipation of the first electrode terminal and the arrangement of other components can be further balanced.

[0135] For example, the ratio of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end surface 113 can be 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, or any value therebetween, etc.

[0136] In some embodiments, the maximum cross-sectional area of the first electrode terminal 14a in a direction perpendicular to the first outer end surface 113 is 400mm 2 ~ 2500mm 2 .

[0137] For example, the maximum cross-sectional area of the first electrode terminal 14a can be 400mm 2 , 600mm 2 , 700mm 2 , 900mm 2 , 1000mm 2 , 1300mm 2 , 1500mm 2 , 1700mm 2 , 2000mm 2 , 2100mm 2 , 2300mm 2 , 2500mm 2 , or any value therebetween, etc.

[0138] In some embodiments, the area of the first outer end surface 113 is 4000mm 2 ~ 16000mm 2 .

[0139] Exemplarily, the area of the first outer end surface 113 can be 4000 mm 2 , 5000 mm 2 , 6000 mm 2 , 7000 mm 2 , 8000 mm 2 , 9000 mm 2 , 10000 mm 2 , 11000 mm 2 , 12000 mm 2 , 13000 mm 2 , 14000 mm 2 , 16000 mm 2 , and any value therebetween, etc.

[0140] In some embodiments, the heat dissipation component 80 is in thermal conduction connection with the first electrode terminal 14a, and the specific implementation mode of the heat dissipation component 80 in thermal conduction connection with the first electrode terminal 14a will be described in detail below.

[0141] Referring to FIG. 9, and in combination with FIG. 10, in some embodiments, the heat dissipation component 80 is in thermal conduction connection with the first electrode terminal 14a, the surface of the first electrode terminal 14a exposed outside the shell 11 includes a first connection area 1411 and a second connection area 1412, the first connection area 1411 is connected with the first busbar component 30a, and the second connection area 1412 is in thermal conduction connection with the heat dissipation component 80.

[0142] The first electrode terminal 14a has a second outer end surface 141 facing away from the inside of the battery monomer 10, the first connection area 1411 can be a part of the second outer end surface 141, and the second connection area 1412 can be a part of the second outer end surface 141, or the second outer end surface 141 can be divided into two parts, one part is the first connection area 1411, and the other part is the second connection area 1412.

[0143] The first electrode terminal 14a can protrude from the first outer end surface 113 in a direction away from the inside of the battery monomer 10. At this time, the first electrode terminal 14a has a second outer end surface 141 and a side surface surrounding the second outer end surface 141, the first connection area 1411 can be a part of the second outer end surface 141 or a part of the side surface, and the second connection area 1412 can be a part of the second outer end surface 141 or a part of the side surface.

[0144] In the technical solution, the first electrode terminal 14a includes a first connecting area 1411 and a second connecting area 1412, the first connecting area 1411 is connected with the first bus component 30a, and the second connecting area 1412 is in thermal connection with the heat dissipation component 80. The first connecting area 1411 facilitates current flow, and the second connecting area 1412 facilitates heat dissipation.

[0145] In some embodiments, the first direction Z is a direction perpendicular to the first outer end surface 113, the first outer end surface 113 has a dimension along the second direction X greater than a dimension along the third direction Y, the second direction X and the third direction Y are perpendicular to the first direction Z, and the first connecting area 1411 is closer to a middle part of the first outer end surface 113 along the second direction X.

[0146] Understandably, the first outer end surface 113 has a dimension along the second direction X greater than a dimension along the third direction Y.

[0147] Optionally, the first outer end surface 113 is rectangular. The length direction of the first outer end surface 113 is parallel to the second direction X, and the width direction of the first outer end surface 113 is parallel to the third direction Y.

[0148] In the technical solution, compared with the second connecting area 1412, the first connecting area 1411 is closer to a middle part of the first outer end surface 113 along the second direction X, facilitating arrangement of the first bus component 30a to a position close to the middle part of the first outer end surface 113 along the second direction X.

[0149] Referring to FIG. 9, in some embodiments, the first outer end surface 113 further includes a second electrode terminal 14b, and the first connecting area 1411 is located on a side of the second connecting area 1412 close to the second electrode terminal 14b, so that the first connecting area 1411 is arranged close to the second electrode terminal 14b, facilitating connection of the first connecting area 1411 and the second electrode terminal 14b with other electrical connecting components (such as a circuit board).

[0150] The structure of the second electrode terminal 14b can be the same as or different from that of the first electrode terminal 14a, which is not described herein again.

[0151] In some embodiments, the second electrode terminal 14b is mirror-symmetrical to the first electrode terminal 14a, and an axis of symmetry of the second electrode terminal 14b is parallel to the third direction Y.

[0152] In some embodiments, the heat dissipation component 80 is in thermal connection with the first electrode terminal 14a, the first direction Z is a direction perpendicular to the first outer end surface 113, the first electrode terminal 14a includes a second outer end surface 141 facing away from the first outer end surface 113 along the first direction Z, the second outer end surface 141 includes a first connection region 1411 and a second connection region 1412, the first connection region 1411 is connected with the first busbar component 30a, and the second connection region 1412 is in thermal connection with the heat dissipation component 80. When a projection plane perpendicular to the first direction Z is projected along the first direction Z, the ratio of the area of the first connection region 1411 to the area of the second outer end surface 141 ranges from 0.3 to 0.7.

[0153] For example, the ratio of the area of the first connection region 1411 to the area of the second outer end surface 141 can be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, or any value therebetween.

[0154] In the above technical solution, the ratio of the area of the first connection region 1411 to the area of the second outer end surface 141 is greater than 0.3, so that the proportion of the first connection region 1411 is not too small, which is conducive to meeting the overcurrent. The ratio of the area of the first connection region 1411 to the area of the second outer end surface 141 is less than 0.7, so that the proportion of the first connection region 1411 is not too large, and the area left for the second connection region 1412 is large, which is conducive to heat dissipation of the first electrode terminal 14a. Therefore, the ratio of the area of the first connection region 1411 to the area of the second outer end surface 141 ranges from 0.3 to 0.7, which can balance the overcurrent and heat dissipation of the first electrode terminal 14a.

[0155] In some embodiments, the heat dissipation component 80 is in thermal connection with the first electrode terminal 14a, the first direction Z is a direction perpendicular to the first outer end surface 113, the first electrode terminal 14a includes a second outer end surface 141 facing away from the first outer end surface 113 along the first direction Z, the second outer end surface 141 includes a first connection region 1411 and a second connection region 1412, the first connection region 1411 is connected with the first busbar component 30a, and the second connection region 1412 is in thermal connection with the heat dissipation component 80. When a projection plane perpendicular to the first direction Z is projected along the first direction Z, the ratio of the area of the second connection region 1412 to the area of the second outer end surface 141 ranges from 0.3 to 0.7.

[0156] For example, the ratio of the area of the second connection region 1412 to the area of the second outer end surface 141 can be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, or any value therebetween.

[0157] In the above technical solution, the ratio of the area of the second connection region 1412 to the area of the second outer end surface 141 is greater than 0.3, so that the proportion of the second connection region 1412 is not too small, which is beneficial to meet the heat dissipation of the first electrode terminal 14a. The ratio of the area of the second connection region 1412 to the area of the second outer end surface 141 is less than 0.7, so that the proportion of the second connection region 1412 is not too large, and the area left for the first connection region 1411 is larger, which is beneficial to the current passing of the first electrode terminal 14a. Therefore, the ratio of the area of the second connection region 1412 to the area of the second outer end surface 141 ranges from 0.3 to 0.7, which can balance the current passing and heat dissipation of the first electrode terminal 14a.

[0158] In some embodiments, the ratio of the area of the first connection region 1411 to the area of the second connection region 1412 is 1. That is, the area of the first connection region 1411 is equal to the area of the second connection region 1412.

[0159] In some embodiments, the area of the first connection region 1411 is 120mm 2 ~ 1700mm 2 .

[0160] Exemplarily, the area of the first connection region 1411 can be 120mm 2 , 200mm 2 , 400mm 2 , 600mm 2 , 800mm 2 , 1000mm 2 , 1200mm 2 , 1300mm 2 , 1500mm 2 , 1700mm 2 , and any value therebetween.

[0161] In some embodiments, the area of the second connection region 1412 is 120mm 2 ~ 1700mm 2 .

[0162] Exemplarily, the area of the second connection region 1412 can be 120mm 2 , 200mm 2 , 400mm 2 , 600mm 2 , 800mm 2 , 1000mm 2 , 1200mm 2 , 1300mm 2 , 1500mm 2 , 1700mm 2 , and any value therebetween.

[0163] Fig. 11 is a schematic diagram of a partial structure of a battery cell 10 according to some embodiments of the present application.

[0164] Referring to Fig. 11, and in combination with Fig. 10, in some embodiments, the heat dissipation component 80 is in thermal contact with the first electrode terminal 14a, the first direction Z is a direction perpendicular to the first outer end surface 113, the first electrode terminal 14a includes a third outer end surface 142 and a fourth outer end surface 143, the third outer end surface 142 is connected to the first busbar component 30a, the fourth outer end surface 143 is in thermal contact with the heat dissipation component 80, the distance between the third outer end surface 142 and the first outer end surface 113 is greater than the distance between the fourth outer end surface 143 and the first outer end surface 113.

[0165] It can be understood that there is a step between the third outer end surface 142 and the fourth outer end surface 143, and when the first outer end surface 113 is horizontally placed, the third outer end surface 142 is higher than the fourth outer end surface 143.

[0166] If the third outer end surface 142 is a flat surface, the distance between the third outer end surface 142 and the first outer end surface 113 measured from any point is the distance between the third outer end surface 142 and the first outer end surface 113. If the fourth outer end surface 143 is a flat surface, the distance between the fourth outer end surface 143 and the first outer end surface 113 measured from any point is the distance between the fourth outer end surface 143 and the first outer end surface 113.

[0167] If the third outer end surface 142 is a concave-convex surface, the distance measured from the highest convex position is the distance between the third outer end surface 142 and the first outer end surface 113. If the fourth outer end surface 143 is a concave-convex surface, the distance measured from the highest convex position is the distance between the fourth outer end surface 143 and the first outer end surface 113.

[0168] In the above technical solutions, the third outer end surface 142 is used to meet the overcurrent of the first electrode terminal 14a, and the fourth outer end surface 143 is used to meet the heat dissipation of the first electrode terminal 14a. The distance between the third outer end surface 142 and the first outer end surface 113 is greater than the distance between the fourth outer end surface 143 and the first outer end surface 113, that is, the third outer end surface 142 is higher than the fourth outer end surface 143, which facilitates the connection of the first connecting area 1411 and the first busbar component 30a, for example, the first connecting area 1411 can provide sufficient penetration for welding, facilitating the welding of the first busbar component 30a at the first connecting area 1411. Compared with the third outer end surface 142, the fourth outer end surface 143 is lower, which is conducive to reducing the space occupation of the first electrode terminal 14a. Compared with the third outer end surface 142, the fourth outer end surface 143 is lower, which is conducive to reducing the space occupation of the first electrode terminal 14a.

[0169] In some embodiments, the ratio of the area of the fourth outer end surface 143 to the area of the first outer end surface 113 ranges from 0.075 to 0.315.

[0170] For example, the ratio of the area of the fourth outer end surface 143 to the area of the first outer end surface 113 can be 0.075, 0.08, 0.09, 0.1, 0.13, 0.15, 0.18, 0.2, 0.24, 0.26, 0.29, 0.3, 0.315, or any value therebetween, etc.

[0171] In the above technical solution, the ratio of the area of the fourth outer end surface 143 to the area of the first outer end surface 113 is greater than 0.075, so that the proportion of the fourth outer end surface 143 is not too small, which is conducive to heat dissipation of the first electrode terminal 14a. The ratio of the area of the fourth outer end surface 143 to the area of the first outer end surface 113 is less than 0.315, so that the proportion of the fourth outer end surface 143 is not too large, which leaves more area for the first outer end surface 113 to arrange other components, and facilitates the arrangement of other components on the first outer end surface 113. Therefore, the ratio of the area of the fourth outer end surface 143 to the area of the first outer end surface 113 ranges from 0.075 to 0.315, which can balance heat dissipation of the first electrode terminal 14a and arrangement of other components on the first outer end surface 113.

[0172] In some embodiments, the ratio of the area of the fourth outer end surface 143 to the area of the first outer end surface 113 ranges from 0.1 to 0.27, which can further balance heat dissipation of the first electrode terminal 14a and arrangement of other components on the first outer end surface 113.

[0173] For example, the ratio of the area of the fourth outer end surface 143 to the area of the first outer end surface 113 can be 0.1, 0.12, 0.14, 0.16, 0.18, 0.2, 0.22, 0.24, 0.26, 0.27, or any value therebetween, etc.

[0174] In some embodiments, the heat dissipation component 80 is in thermal conductive connection with the first busbar component 30a. Referring to FIG. 10, in some embodiments, the first busbar component 30a includes opposite first and second surfaces 30a1 and 30a2 in a direction perpendicular to the first outer end surface 113, the first surface 30a1 is connected to the first electrode terminal 14a, and the second surface 30a2 is in thermal conductive connection with the heat dissipation component 80.

[0175] Understandably, the first electrode terminal 14a and the heat dissipation component 80 are respectively connected to two surfaces in the thickness direction of the first busbar component 30a.

[0176] In the above technical solution, the first surface 30a1 is connected to the first electrode terminal 14a, and the second surface 30a2 is connected in thermal conduction to the heat dissipation component 80, so that the connection of the busbar component 30 to the first electrode terminal 14a and the heat dissipation component 80 is more convenient.

[0177] The heat dissipation component 80 can have various structures, and the specific structure of the heat dissipation component 80 will be described in detail below with reference to the accompanying drawings.

[0178] FIG. 12 is a structural schematic diagram of another embodiment of the heat dissipation component 80 in FIG. 10.

[0179] Referring to FIG. 12, in some embodiments, the heat dissipation component 80 is accommodated in the box 20.

[0180] Referring to FIG. 12, in some embodiments, the heat dissipation component 80 is internally formed with an accommodation cavity 81 for accommodating a heat exchange medium. The accommodation cavity 81 can accommodate the heat exchange medium, so as to obtain the heat dissipation component 80 with higher heat dissipation capacity.

[0181] It should be understood that the accommodation cavity 81 is used to accommodate a cooling medium to dissipate heat for the first electrode terminal 14a. The cooling medium includes but is not limited to water, a mixture of water and ethylene glycol, or air, etc.

[0182] In some embodiments, the heat dissipation component 80 includes a connecting portion which is at least partially made of metal material, and the heat dissipation component 80 is connected to the first electrode terminal 14a through insulating heat-conductive glue.

[0183] In some embodiments, the heat dissipation component 80 includes a connecting portion which is at least partially made of metal material, and the heat dissipation component 80 is connected to the first busbar component 30a through insulating heat-conductive glue.

[0184] The material of the connecting portion includes but is not limited to an aluminum alloy material, a brazing composite material, etc. In some embodiments, the material of the connecting portion is a 3-series aluminum alloy. In some embodiments, the material of the connecting portion is a 3003 aluminum alloy.

[0185] In the above technical solution, the heat dissipation component 80 includes a connecting portion which is at least partially made of metal material, the metal material has higher heat conduction efficiency, and the heat dissipation efficiency of the first electrode terminal 14a can be improved. The heat dissipation component 80 is connected to the first electrode terminal 14a and / or the first busbar component 30a through insulating heat-conductive glue, the insulating heat-conductive glue can improve the heat conduction efficiency and reduce the risk of short circuit of the heat dissipation component 80 and the first electrode terminal 14a and / or the first busbar component 30a.

[0186] Referring to FIG. 10, in some embodiments, the battery device 100 further includes a box 20, and the battery monomer 10 and the first busbar component 30a are both accommodated in the box 20. The heat dissipation component 80 is a first box wall 24 of the box 20.

[0187] Understandably, the first box wall 24 is in thermal contact with the first electrode terminal 14a and / or the first busbar component 30a. The first box wall 24 is used to dissipate heat from the first electrode terminal 14a, which simplifies the number of components and saves the manufacturing cost of the battery device 100.

[0188] Referring to FIG. 10, in some embodiments, the battery device 100 further comprises a first thermal management component 70, which is arranged outside the first box wall 24 and in thermal contact with the first box wall 24, and an inner portion of the first thermal management component 70 is formed with a first flow channel 71 for accommodating a heat exchange medium.

[0189] The first thermal management component 70 is a component for accommodating a heat exchange medium to regulate the temperature in the box 20. The heat exchange medium herein can be a liquid or a gas, and the temperature regulation refers to heating or cooling the plurality of battery monomers 10. In the case of cooling or reducing the temperature of the battery monomers 10, the first thermal management component is used to accommodate a cooling fluid to reduce the temperature of the plurality of battery monomers 10, at this time, the first thermal management component can also be referred to as a cooling component, a cooling system or a cooling plate, etc., and the fluid it accommodates can also be referred to as a cooling medium or a cooling fluid, more specifically, a cooling liquid or a cooling gas. In addition, the first thermal management component can also be used for heating to warm up the plurality of battery monomers 10. Optionally, the fluid can be circulated to achieve better temperature regulation effect. Optionally, the fluid can be water, a mixture of water and ethylene glycol or air, etc.

[0190] The thermal contact between the first thermal management component 70 and the first box wall 24 can be in various forms, for example, the first thermal management component 70 can be in direct contact with the first box wall 24, and in order to improve the thermal conductivity, a material or component with high thermal conductivity such as a thermal pad, an insulating thermal adhesive, etc. can be arranged between the first thermal management component 70 and the first box wall 24.

[0191] In the above technical solution, the first thermal management component 70 is in thermal contact with the first box wall 24, so that the first thermal management component 70 can exchange heat with the first box wall 24, thereby regulating the temperature in the box 20 and improving the reliability of the battery device 100.

[0192] The first thermal management component 70 is arranged outside the first box wall 24, i.e. the first thermal management component 70 is located outside the box 20, so that the risk of short circuit of the electrical connection caused by leakage of the heat exchange medium in the box 20 can be reduced, thereby improving the reliability of the battery device 100.

[0193] In some embodiments, the outer side of the first box wall 24 is formed with a groove 241, and at least a part of the first thermal management component 70 is accommodated in the groove 241.

[0194] The recess 241 is a recessed structure formed on the outer side of the first case wall 24, which is the side of the first case wall 24 facing outside the case 20. The recess 241 can be formed by cutting the outer side of the first case wall 24, or the recess 241 can be formed by stamping the first case wall 24.

[0195] The extension path of the recess 241 can be various, as long as the first thermal management component 70 can cover a plurality of battery cells 10 to a large extent.

[0196] In the above technical solution, the recess 241 is formed on the outer side of the first case wall 24, and at least part of the first thermal management component 70 is accommodated in the recess 241, so that the first case wall 24 and the first thermal management component 70 can share a part of the space, thereby improving the space utilization rate of the battery device 100.

[0197] In some embodiments, the inner side of the first case wall 24 is formed with a protrusion 242 corresponding to the position of the recess 241, and the protrusion 242 is in thermal conductive connection with the first electrode terminal 14a and / or the first busbar component 30a.

[0198] The inner side of the first case wall 24 refers to the surface of the first case wall 24 facing inside the case 20.

[0199] The first case wall 21 can be formed by stamping to form the recess 241 on the outer side of the first case wall 24 and the protrusion 242 corresponding to the recess 241 on the inner side of the first case wall 24 at the same time.

[0200] In the above technical solution, the inner side of the first case wall 24 is formed with the protrusion 242 corresponding to the position of the recess 241, and the protrusion 242 can improve the structural strength of the first case wall 24, and it is more convenient for the protrusion 242 to be in thermal conductive connection with the first electrode terminal 14a and / or the first busbar component 30a.

[0201] FIG. 13 is a structural schematic diagram of another embodiment of the heat dissipation component 80 in FIG. 10.

[0202] Referring to FIG. 13, the heat dissipation component 80 is the first case wall 24 of the case 20, and in some embodiments, the first case wall 24 is internally formed with a second flow channel 243 for accommodating a heat exchange medium.

[0203] It can be understood that the second flow channel 243 is a cavity structure formed inside the first case wall 24.

[0204] The forming mode of the first case wall 24 includes but is not limited to extrusion forming, injection molding, etc. The first case wall 24 can also include two plate bodies arranged in layers, and the second flow channel 243 is defined between the two plate bodies.

[0205] In the above technical solution, the first box wall 24 has a second flow channel 243 formed inside for accommodating a heat exchange medium, which simplifies the number of components and enables the heat dissipation component 80 to have high heat dissipation capacity without the need for additional first heat management components 70.

[0206] When the first outer end surface 113 is located at the top of the housing 111 of the battery monomer 10, the first heat management component 70, the first box wall 24, and the heat dissipation component 80 mentioned above are all located at the top wall of the battery monomer 10, and the functions of the first heat management component 70, the first box wall 24, and the heat dissipation component 80 can be understood as top heat management.

[0207] To further improve the reliability of the battery device 100, other heat management components can also be provided in thermal contact with the side and / or bottom of the battery monomer 10 to improve the temperature regulation efficiency of the battery monomer 10.

[0208] Referring to FIGS. 4, 7, and 8, in some embodiments, the battery monomer 10 further includes a fifth outer end surface 114, which is opposite or intersects the first outer end surface 113 on the same battery monomer 10, and the battery device 100 further includes a second heat management component 90 in thermal contact with the second outer end surface 141.

[0209] The fifth end surface can be an end surface opposite the first outer end surface 113, and the fifth outer end surface 114 can also be an end surface intersecting the first outer end surface 113.

[0210] In some embodiments, the first outer end surface 113 is the outer surface of the end cover 112, and the fifth outer end surface 114 can be the outer surface of the bottom wall of the housing 111, in which case the fifth outer end surface 114 is opposite the first outer end surface 113.

[0211] In some embodiments, the first outer end surface 113 is the outer surface of the end cover 112, and the fifth outer end surface 114 can be the outer surface of one side wall of the housing 111, in which case the fifth outer end surface 114 intersects the first outer end surface 113.

[0212] For example, referring to FIGS. 7 and 8, the fifth outer end surface 114 intersects the first outer end surface 113, and in some embodiments, the plurality of battery monomers 10 form a rectangular array, and the second heat management component 90 has a third flow channel (not shown in the figure) formed inside for accommodating a heat exchange medium. The second heat management component 90 can be arranged between two adjacent rows or two adjacent columns of battery monomers 10. The second heat management component 90 is used to regulate the temperature of the plurality of battery monomers 10.

[0213] In the above technical solution, the second heat management component 90 regulates the temperature of the battery monomer 10, which can further improve the reliability of the battery device 100.

[0214] In some embodiments, the fifth outer end face 114 is the outer end face with the largest area of the battery cell 10.

[0215] Exemplarily, the battery cell 10 is a cuboid, the battery cell 10 comprises a shell 111 and an end cover 112, the shell 111 comprises four side walls connected head to tail, the four side walls comprise two narrow faces arranged along the second direction X and two large faces arranged opposite along the third direction Y, the first outer end face 113 is an outer surface of the end cover 112, and the fifth outer end face 114 is an outer surface of the large face of the shell 111.

[0216] In the above technical solution, the fifth outer end face 114 has a large heat exchange area with the second heat management component 90, and the heat exchange efficiency can be improved.

[0217] The embodiments of the present application also provide a power utilization device, which comprises the battery device 100 described above, and the battery device 100 is used to provide electric energy.

[0218] Referring to FIGS. 2-11, the application also provides a battery device 100, which comprises a box 20, a plurality of battery cells 10, a first busbar component 30a, a second busbar component 30b, a first thermal management component 70 and a second thermal management component 90. The box 20 comprises a first box 21 and a first box wall 24, the first box 21 is open at the top, and the first box wall 24 covers the opening. The first box wall 24 is formed by stamping to form a groove 241 on the outer side of the first box wall 24 and a protrusion 242 corresponding to the groove 241 on the inner side of the first box wall 24. The plurality of battery cells 10 are accommodated in the box 20. The plurality of battery cells 10 are arranged in a rectangular array, which comprises M rows and N columns, each row comprises a plurality of battery cells 10 arranged along the second direction X, and each column comprises a plurality of battery cells 10 arranged along the third direction Y, wherein M is greater than or equal to 2, and N is greater than or equal to 2. The second thermal management component 90 is arranged between two adjacent rows of battery cells 10, and the inside of the second thermal management component 90 forms a third flow channel for accommodating a heat exchange medium. The second thermal management component 90 extends along the second direction X. The first thermal management component 70 is arranged on the outer side of the first box cover, and the first thermal management component 70 is located outside the box 20. At least part of the first thermal management component 70 is accommodated in the groove 241. The first thermal management component 70 is connected to the first box cover by a heat-conducting adhesive. The battery cell 10 comprises an electrode assembly 12, an outer shell 11 and a first electrode terminal 14a and a second electrode terminal 14b, the outer shell 11 is in the shape of a rectangular parallelepiped, the outer shell 11 comprises a shell body 111 and an end cover 112, the shell body 111 is open at the top, the end cover 112 covers the opening of the shell body 111, and the electrode assembly 12 is accommodated in the outer shell 11. The shell body 111 comprises four side walls connected end to end, which comprise two narrow faces arranged along the second direction X and two large faces arranged opposite to each other along the third direction Y. The second thermal management component 90 is connected to the large face by heat conduction. The first electrode terminal 14a and the second electrode terminal 14b are both arranged on the end cover 112, and the first electrode terminal 14a and the second electrode terminal 14b are arranged at intervals along the second direction X. The first busbar component 30a is connected to the first electrode terminal 14a and is used to realize electrical connection between different battery cells 10, and the second busbar component 30b is connected to the second electrode terminal 14b and is used to realize electrical connection between different battery cells 10. The first electrode terminal 14a and the second electrode terminal 14b are mirror-symmetric, the symmetry plane is parallel to the plane formed by the first direction Z and the third direction Y (YZ plane), and the symmetry plane is located at the middle of the battery cell 10 along the second direction X.The first direction Z is a direction perpendicular to the first outer end surface 113. The first electrode terminal 14a includes a third outer end surface 142 and a fourth outer end surface 143 facing away from the first outer end surface 113 along the first direction Z. The third outer end surface 142 and the fourth outer end surface 143 are arranged along the second direction X. The third outer end surface 142 is closer to the second electrode terminal 14b than the fourth outer end surface 143. The third outer end surface 142 is connected to the first bus member 30a. The fourth outer end surface 143 is thermally connected to the heat dissipation member 80. The distance between the third outer end surface 142 and the first outer end surface 113 is greater than the distance between the fourth outer end surface 143 and the first outer end surface 113. A step is formed between the third outer end surface 142 and the fourth outer end surface 143. Along the first direction Z, the first bus member 30a includes opposite first and second surfaces 30a1 and 30a2. The first surface 30a1 is welded to the third outer end surface 142. The second surface 30a2 is thermally connected to the heat dissipation member 80 through insulating thermal conductive glue. The fourth outer end surface 143 is thermally connected to the protrusion 242 of the first tank wall 24. On the same projection plane perpendicular to the second direction X, the orthogonal projection of the protrusion 242 overlaps the orthogonal projection of the first electrode terminal 14a. This makes the first end cover 112 sink, so that the first end cover 112 and the first electrode terminal 14a can share a part of space in the first direction Z, reducing the space occupation.

[0219] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict.

[0220] The above embodiments are only used to illustrate the technical solutions of the present application, and are not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. 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 battery cells, each battery cell comprising a housing, an electrode assembly, and a first electrode terminal, the housing forming an accommodation space, the electrode assembly being located in the accommodation space, and the first electrode terminal being provided at a first outer end surface of the housing; a first busbar component connected to the first electrode terminal and configured to realize electrical connection between different battery cells; wherein the battery device further comprises a heat dissipation component in thermal contact with the first electrode terminal and / or the first busbar component.

2. The battery device according to claim 1, characterized by The ratio of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end surface ranges from 0.25 to 0.45 in a direction perpendicular to the first outer end surface.

3. The battery device of claim 2, wherein, The ratio of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end surface ranges from 0.3 to 0.

4.

4. The battery device according to any one of claims 1 to 3, characterized by, The heat dissipation component is in thermal contact with the first electrode terminal, and the surface of the first electrode terminal exposed outside the housing comprises a first connection area and a second connection area, the first connection area being connected to the first busbar component, and the second connection area being in thermal contact with the heat dissipation component.

5. The battery device of claim 4, wherein, The first direction is perpendicular to the first outer end surface, the dimension of the first outer end surface along the second direction is greater than that along the third direction, the second direction and the third direction are perpendicular to each other, and the first connection area is closer to the middle of the first outer end surface along the second direction.

6. The battery device according to claim 4 or 5, characterized by The first outer end surface is further provided with a second electrode terminal, and the first connection area is located on the side of the second connection area close to the second electrode terminal.

7. The battery device according to any one of claims 1 to 6, wherein The heat dissipation component is in thermal contact with the first electrode terminal, the first direction is perpendicular to the first outer end surface, the first electrode terminal comprises a second outer end surface facing away from the first outer end surface along the first direction, the second outer end surface comprises a first connection area and a second connection area, the first connection area is connected to the first busbar component, and the second connection area is in thermal contact with the heat dissipation component; when the second outer end surface is projected along the first direction on a projection plane perpendicular to the first direction, the ratio of the area of the first connection area to the area of the second outer end surface ranges from 0.3 to 0.

7.

8. The battery device according to any one of claims 1 to 6, wherein The heat dissipation component is in thermal contact with the first electrode terminal, the first direction is perpendicular to the first outer end surface, the first electrode terminal comprises a second outer end surface facing away from the first outer end surface along the first direction, the second outer end surface comprises a first connection area and a second connection area, the first connection area is connected to the first busbar component, and the second connection area is in thermal contact with the heat dissipation component; when the second outer end surface is projected along the first direction on a projection plane perpendicular to the first direction, the ratio of the area of the second connection area to the area of the second outer end surface ranges from 0.3 to 0.

7.

9. The battery device according to any one of claims 1 to 6, wherein The heat dissipation component is in thermal contact with the first electrode terminal, the first direction is perpendicular to the first outer end surface, the first electrode terminal comprises a third outer end surface and a fourth outer end surface, the third outer end surface is connected to the busbar component, the fourth outer end surface is in thermal contact with the heat dissipation component, the distance between the third outer end surface and the first outer end surface is greater than the distance between the fourth outer end surface and the first outer end surface.

10. The battery device of claim 9, wherein, The ratio of the area of the fourth outer end surface to the area of the first outer end surface ranges from 0.075 to 0.

315.

11. The battery device of claim 10, wherein, The ratio of the area of the fourth outer end surface to the area of the first outer end surface ranges from 0.1 to 0.

27.

12. The battery device according to any one of claims 1 to 11, wherein In the direction perpendicular to the first outer end surface, the first busbar component comprises opposite first and second surfaces, the first surface is connected to the first electrode terminal, and the second surface is in thermal contact with the heat dissipation component.

13. The battery device of any one of claims 1-12, wherein, The heat dissipation component has an accommodation cavity for accommodating a heat exchange medium.

14. The battery device of any one of claims 1-13, wherein, The heat dissipation component comprises a connecting portion made at least partially of metal, and the heat dissipation component is connected to the first electrode terminal and / or the first busbar component by insulating thermal conductive glue.

15. The battery device of any one of claims 1-12, wherein, The battery device further comprises a box, and the battery cell and the first busbar component are accommodated in the box. The heat dissipation component is a first box wall of the box.

16. The battery device of claim 15, wherein, The battery device further comprises a first thermal management component, which is arranged outside the first box wall and in thermal contact with the first box wall, and has a first flow channel for accommodating a heat exchange medium.

17. The battery device of claim 16, wherein, The outer side of the first box wall is formed with a groove, and at least part of the first thermal management component is accommodated in the groove.

18. The battery device of claim 17, wherein, The inner side of the first box wall is formed with a protrusion corresponding to the position of the groove, and the protrusion is in thermal contact with the first electrode terminal and / or the first busbar component.

19. The battery device of claim 15, wherein, The first box wall is formed with a second flow channel for accommodating a heat exchange medium.

20. The battery device of any one of claims 1-19, wherein, The battery cell further comprises a fifth outer end surface, which is located on the same battery cell as the first outer end surface and opposite or intersects with the first outer end surface, and the battery device further comprises a second thermal management component in thermal contact with the fifth outer end surface.

21. The battery device of claim 20, wherein, The fifth outer end surface is the outer end surface with the largest area of the battery cell.

22. An electrical device, comprising: The battery device comprises the battery device of any one of claims 1-21, and is used to provide electric energy.

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