Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device. The battery device comprises a plurality of battery cells, a first confluence component and a heat dissipation component. The single battery comprises a shell, an electrode assembly and a first electrode terminal, the shell forms a containing space, the electrode assembly is located in the containing space, and the first electrode terminal is arranged on the first outer end face of the shell; and the first confluence component is connected to the first electrode terminal and is used for realizing electric connection between different battery monomers. The heat dissipation part is in heat conduction connection with the first electrode terminal and / or the first convergence part. The structure can effectively improve the reliability and cycle life of the battery device.

Description

Technical Field

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

[0002] With the development of new energy technologies, battery devices are increasingly widely used. Battery devices have high energy density, high reliability, long service life, and environmental friendliness to the social environment, and have been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery swapping stations, engineering manufacturing, intelligent devices, etc. At the same time, they also promote the technological development and research in the fields of communication terminals, medical devices, energy development, etc.

[0003] In the technology of battery devices, how to improve the reliability and cycle life of battery devices is a technical problem to be solved urgently. Summary of the Utility Model

[0004] Embodiments of the present application provide a battery device and an electrical device, which can effectively improve the reliability and cycle life of the battery device.

[0005] In a first aspect, an embodiment of the present application provides a battery device, which includes a plurality of battery cells, a first busbar component, and a heat dissipation component. The battery cell includes a housing, an electrode assembly, and a first electrode terminal. The housing forms an accommodation space, the electrode assembly is located in the accommodation space, and the first electrode terminal is disposed on a first outer end face of the housing; the first busbar component is connected to the first electrode terminal and is used to realize electrical connection between different battery cells; the heat dissipation component is thermally connected to the first electrode terminal and / or the first busbar component.

[0006] In the above technical solution, by thermally connecting the heat dissipation component to the first electrode terminal, the heat dissipation component can dissipate heat from the first electrode terminal and reduce the temperature of the first electrode terminal. By thermally connecting the heat dissipation component to the first busbar component, the heat dissipation component can dissipate heat from the first busbar component and reduce the temperature of the first busbar component, thereby reducing the temperature of the first electrode terminal connected to the first busbar component. Therefore, thermally connecting the heat dissipation component to the first electrode terminal and / or the first busbar component can reduce the temperature of the first electrode terminal, reduce the heat transferred from the first electrode terminal to the inside of the battery cell, and reduce the influence of the heat generation of the first electrode terminal on the internal temperature of the battery cell, thus improving the reliability and cycle life of the battery device.

[0007] In some embodiments, along the direction perpendicular to the first outer end face, the ratio range of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end face is 0.25 to 0.45.

[0008] 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. The proportion of the first electrode terminal on the first outer end face is not too small, which facilitates the assembly of the first electrode terminal to the housing and facilitates the heat dissipation component to dissipate heat from 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. The proportion of the first electrode terminal on the first outer end face is not too large, leaving more area for other components to be arranged on the first end face. Therefore, the ratio range of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end face is from 0.25 to 0.45, which can balance the heat dissipation of the first electronic terminal and the arrangement of other components.

[0009] In some embodiments, the ratio range of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end face is 0.3 to 0.4.

[0010] In the above technical solution, it can further balance the heat dissipation of the first electronic terminal and the arrangement of other components on the first outer end face.

[0011] In some embodiments, the heat dissipation component is thermally connected to the first electrode terminal. The surface of the first electrode terminal exposed outside the housing includes 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 thermally connected to the heat dissipation component.

[0012] 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 to the first busbar component, and the second connection area is thermally connected to the heat dissipation component. The first connection area facilitates current conduction, and the second connection area facilitates heat dissipation.

[0013] In some embodiments, the first direction is perpendicular to the first outer end face. The dimension of the first outer end face along the second direction is greater than the dimension along the third direction. The second direction, the third direction, and the first direction are perpendicular to each other in pairs. The first connection area is closer to the middle of the first outer end face along the second direction.

[0014] In the above technical solution, the first connection area is closer to the middle of the first outer end face along the second direction, which facilitates the arrangement of the first busbar component to a position close to the middle of the first outer end face along the second direction.

[0015] In some embodiments, a second electrode terminal is further provided on the first outer end face. The first connection area is located on the side of the second connection area closer to the second electrode terminal.

[0016] In the above technical solution, the first connection area is arranged close to the second electrode terminal, which facilitates the connection of the first connection area and the second electrode terminal to other electrical connectors (such as a circuit board) together.

[0017] In some embodiments, the heat dissipation component is thermally connected to the first electrode terminal. The first direction is perpendicular to the first outer end face. The first electrode terminal includes a second outer end face facing away from the first outer end face along the first direction. The second outer end face includes a first connection area and a second connection area. The first connection area is connected to the first current collecting component, and the second connection area is thermally connected to the heat dissipation component. When 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 face ranges from 0.3 to 0.7.

[0018] In the above technical solution, the ratio of the area of the first connection area to the area of the second outer end face is greater than 0.3, and the proportion of the first connection area is not too small, which is beneficial to meeting the overcurrent requirement. The ratio of the area of the first connection area to the area of the second outer end face is less than 0.7, and the proportion of the first connection area is not too large, leaving a relatively large area for the second connection area, which is beneficial to the heat dissipation of the first electrode terminal. Therefore, the ratio of the area of the first connection area to the area of the second outer end face ranges from 0.3 to 0.7, which can balance the overcurrent and heat dissipation of the first electrode terminal.

[0019] In some embodiments, the heat dissipation component is thermally connected to the first electrode terminal. The first direction is perpendicular to the first outer end face. The first electrode terminal includes a second outer end face facing away from the first outer end face along the first direction. The second outer end face includes a first connection area and a second connection area. The first connection area is connected to the first current collecting component, and the second connection area is thermally connected to the heat dissipation component. When 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 face ranges between 0.3 and 0.7.

[0020] In the above technical solution, the ratio of the area of the second connection area to the area of the second outer end face is greater than 0.3, and the proportion of the second connection area is not too small, which is beneficial to meeting the heat dissipation requirement of the first electrode terminal. The ratio of the area of the second connection area to the area of the second outer end face is less than 0.7, and the proportion of the second connection area is not too large, leaving a relatively large area for the first connection area, which is beneficial to the overcurrent of the first electrode terminal. Therefore, the ratio of the area of the second connection area to the area of the second outer end face ranges from 0.3 to 0.7, which can balance the overcurrent and heat dissipation of the first electrode terminal.

[0021] In some embodiments, the heat dissipation component is thermally connected to the first electrode terminal. The first direction is perpendicular to the first outer end face. The first electrode terminal includes a third outer end face and a fourth outer end face facing away from the first outer end face along the first direction. The third outer end face is connected to the first current collecting component, and the fourth outer end face is thermally connected to the heat dissipation component. The distance between the third outer end face and the first outer end face is greater than the distance between the fourth outer end face and the first outer end face.

[0022] In the above technical solution, the third outer end face is used to satisfy the overcurrent of the first electrode terminal, and the fourth outer end face is used to satisfy the heat dissipation of the first electrode terminal. The distance between the third outer end face and the first outer end face is greater than the distance between the fourth outer end face and the first outer end face, that is, the third outer end face is higher than the fourth outer end face. This facilitates the connection between the first connection area and the first current collecting component. For example, the first connection area can provide sufficient penetration depth for welding, facilitating the welding of the first current collecting component in the first connection area. Compared with the third outer end face, the fourth outer end face is lower, which is beneficial to reducing the space occupied by the first electrode terminal.

[0023] In some embodiments, the ratio of the area of the fourth outer end face to the area of the first outer end face ranges from 0.075 to 0.315.

[0024] In the above technical solution, the ratio of the area of the fourth outer end face to the area of the first outer end face is greater than 0.075, and the proportion of the fourth outer end face is not too small, which is beneficial to satisfying the heat dissipation of the first electrode terminal. The ratio of the area of the fourth outer end face to the area of the first outer end face is less than 0.315, and the proportion of the fourth outer end face is not too large, leaving more area for arranging other components on the first outer end face, facilitating the arrangement of other components on the first outer end face. Therefore, the ratio of the area of the fourth outer end face to the area of the first outer end face ranging from 0.075 to 0.315 can balance the heat dissipation of the first electrode terminal and the arrangement of other components on the first outer end face.

[0025] In some embodiments, the ratio of the area of the fourth outer end face to the area of the first outer end face ranges from 0.1 to 0.27.

[0026] In the above technical solution, it can further balance the heat dissipation of the first electrode terminal and the arrangement of other components on the first outer end face.

[0027] In some embodiments, along the direction perpendicular to the first outer end face, the first current collecting component includes opposite first and second surfaces. The first surface is connected to the first electrode terminal, and the second surface is thermally connected to the heat dissipation component.

[0028] In the above technical solution, the first surface is connected to the first electrode terminal, and the second surface is thermally connected to the heat dissipation component, making the connection between the bus bar component and the first electrode terminal and the heat dissipation component more convenient.

[0029] In some embodiments, a receiving cavity for receiving a heat exchange medium is formed inside the heat dissipation component.

[0030] In the above technical solution, the receiving cavity can accommodate the heat exchange medium, obtaining a heat dissipation component with a relatively high heat dissipation capacity.

[0031] In some embodiments, the heat dissipation component includes a connecting portion, at least part of the connecting portion is made of a metal material, and the heat dissipation component is connected to the first electrode terminal and / or the first bus bar component through an insulating thermal conductive adhesive.

[0032] In the above technical solution, the heat dissipation component includes a connecting portion, at least part of the connecting portion is made of a metal material, and the metal material has a relatively high heat conduction efficiency, which can improve the heat dissipation efficiency of the first electrode terminal. The heat dissipation component is connected to the first electrode terminal and / or the first bus bar component through an insulating thermal conductive adhesive, and the insulating thermal conductive adhesive can improve the heat conduction efficiency and reduce the risk of short circuit between the heat dissipation component and the first electrode terminal and / or the first bus bar component.

[0033] In some embodiments, the battery device further includes a box body, and both the battery cell and the first bus bar component are accommodated in the box body; the heat dissipation component is the first box wall of the box body.

[0034] In the above technical solution, the heat dissipation component is the first box wall of the box body, that is, the first box wall conducts heat with the first electrode terminal and / or the first bus bar component, and uses the first box wall to dissipate heat for the first electrode terminal, simplifying the number of components and saving the manufacturing cost of the battery device.

[0035] In some embodiments, the battery device further includes a first heat management component, the first heat management component is disposed outside the first box wall and is thermally connected to the first box wall, and a first flow channel for receiving a heat exchange medium is formed inside the first heat management component.

[0036] In the above technical solution, the first heat management component is thermally connected to the first box wall, enabling the first heat management component to exchange heat with the first box wall, thereby adjusting the temperature inside the box body and improving the reliability of the battery device.

[0037] The first heat management component is disposed outside the first box wall, that is, the first heat management component is located outside the box body. In this way, the risk of short circuit of the electrical connection caused by the leakage of the heat exchange medium inside the box can be reduced, thereby improving the reliability of the battery device.

[0038] In some embodiments, a groove is formed on the outer side surface of the first box wall, and at least a part of the first heat management component is received in the groove.

[0039] In the above technical solution, a groove is formed on the outer side surface of the first box wall, and at least a part of the first heat management component is received in the groove, so that the first box wall and the first heat management component can share a part of the space, improving the space utilization rate of the battery device.

[0040] In some embodiments, a convex portion is formed on the inner side surface of the first box wall corresponding to the position of the groove, and the convex portion is thermally connected to the first electrode terminal and / or the first busbar component.

[0041] In the above technical solution, a convex portion is formed on the inner side surface of the first box wall corresponding to the position of the groove. The convex portion can improve the structural strength of the first box wall, and at the same time, it is more convenient for the convex portion to be thermally connected to the first electrode terminal and / or the first busbar component.

[0042] In some embodiments, a second flow channel for accommodating a heat exchange medium is formed inside the first box wall.

[0043] In the above technical solution, a second flow channel for accommodating a heat exchange medium is formed inside the first box wall, which simplifies the number of components and can obtain a heat dissipation component with a higher heat dissipation capacity without additionally setting a first heat management component.

[0044] In some embodiments, the battery cell further includes a fifth outer end surface, the second outer end surface and the first outer end surface are located on the same battery cell and are opposite or intersecting, and the battery device further includes a second heat management component, and the second heat management component is thermally connected to the second outer end surface.

[0045] In the above technical solution, the second heat management component adjusts the temperature of the battery cell, which can further improve the reliability of the battery device.

[0046] In some embodiments, the fifth outer end surface is the outer end surface with the largest area of the battery cell.

[0047] In the above technical solution, there is a large heat exchange area between the fifth outer end surface and the second heat management component, which can improve the heat exchange efficiency.

[0048] In a second aspect, an electrical device provided by an embodiment of the present application includes the above battery device, and the battery device is used to provide electrical energy. Description of the Drawings

[0049] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0050] Figure 1 Structural schematic diagram of a vehicle according to some embodiments of the present application;

[0051] Figure 2 Structural schematic diagram of a battery device according to some embodiments of the present application from one perspective;

[0052] Figure 3 Exploded schematic diagram of a battery device according to some embodiments of the present application;

[0053] Figure 4 Exploded schematic diagram of a battery cell according to some embodiments of the present application;

[0054] Figure 5 Structural schematic diagram of a battery device according to some embodiments of the present application from another perspective; [[ID=2I]]

[0055] Figure 6 For Figure 5 Cross-sectional view along A - A;

[0056] Figure 7 Schematic diagram of a partial internal structure of a battery device according to some embodiments of the present application from one perspective;

[0057] Figure 8 Schematic diagram of a partial internal structure of a battery device according to some embodiments of the present application from another perspective;

[0058] Figure 9 Structural schematic diagram of a battery cell according to some embodiments of the present application;

[0059] Figure 10 For Figure 6 Enlarged view of part A in;

[0060] Figure 11 Partial structural schematic diagram of a battery cell according to some embodiments of the present application;

[0061] Figure 12 For Figure 10 Structural schematic diagram of another embodiment of the heat dissipation component in; [[ID=SS]]

[0062] Figure 13 For Figure 10 Structural schematic diagram of yet another embodiment of the heat dissipation component in.

[0063] Icons: 100 - Battery device; 10 - Battery cell; 11 - Housing; 111 - Shell; 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 body; 21 - First box body; 22 - Second box body; 23 - Accommodating space; 24 - First box wall; 241 - Groove; 242 - Protrusion; 243 - Second flow channel; 30 - Bus bar component; 30a - First bus bar component; 30a1 - First surface; 30a2 - Second surface; 30b - Second bus bar component; 70 - First thermal management component; 71 - First flow channel; 80 - Heat dissipation component; 81 - Accommodating cavity; 90 - Second thermal management component; 1000 - Vehicle; 200 - Motor; 300 - Controller; Z - First direction; X - Second direction; Y - Third direction.

[0064] The attached drawings are not drawn to actual scale. Detailed implementation manners

[0065] 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 clearly described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0066] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the technical field 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 "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0067] Referring to "embodiments" in the present application means that specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0068] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0069] The term "and / or" in the present application is merely an association relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and back associated objects.

[0070] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to the present application.

[0071] The term "a plurality of" appearing in the present application refers to two or more (including two).

[0072] In the embodiments of the present application, the battery cell can be a secondary battery, and a secondary battery refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0073] The battery cell includes but is not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium-metal batteries, sodium-metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0074] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0075] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0076] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0077] In some embodiments, the electrode assembly has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0078] In some embodiments, the electrode assembly has a stacked structure.

[0079] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0080] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of folded segments arranged in a stacked manner, and a positive electrode sheet is clamped between adjacent folded segments.

[0081] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments arranged in a stacked manner.

[0082] As an example, a plurality of separators may be provided and are respectively arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0083] As an example, the separators may be continuously provided and are arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0084] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, prismatic, etc.

[0085] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0086] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may 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.

[0087] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, and the multi-prismatic battery cell is, for example, a hexagonal-prismatic battery cell, etc.

[0088] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a current collecting component.

[0089] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module.

[0090] As an example, the battery module can be formed by bundling multiple battery cells with cable ties.

[0091] In some embodiments, the battery device can be a battery pack, which can include a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0092] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0093] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing multiple battery cells to the box body.

[0094] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, "closed" means covering or closing, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0095] As an example, the box body 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 a closed space is formed inside the box body to accommodate the battery cell assembly.

[0096] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beams and longitudinal beams of the vehicle.

[0097] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body, and a door is provided on at least one side of the box body. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0098] The development of battery technology needs to consider multiple design factors simultaneously. For example, performance parameters such as energy density, discharge capacity, charge and discharge rate, etc. In addition, the cycle life and reliability of the battery device also need to be considered.

[0099] To achieve overcurrent, the electrode terminal needs to extend into the battery cell to be electrically connected to the electrode assembly, and also extend outside the battery cell to be electrically connected to the busbar component. In this structure, heat is generated during the operation of the electrode terminal. Especially in battery devices with high overcurrent requirements, the heat generated by the busbar component and the electrode terminal is relatively large. The heat conducted through the electrode terminal into the battery cell will cause the operating temperature of the internal components of the battery cell to increase, reducing the cycle life and reliability of the battery device.

[0100] In view of this, to solve the problem that the heat conducted through the electrode terminal into the battery cell causes the operating temperature of the internal components of the battery cell to increase, reducing the cycle life and reliability of the battery device, an embodiment of the present application provides a technical solution. In this technical solution, a heat dissipation component is thermally connected to the electrode terminal and / or the busbar component.

[0101] By thermally connecting the heat dissipation component to the electrode terminal, the heat dissipation component can dissipate heat from the electrode terminal and reduce the temperature of the electrode terminal. By thermally connecting the heat dissipation component to the busbar component, the heat dissipation component can dissipate heat from the busbar component and reduce the temperature of the busbar component, thereby reducing the temperature of the electrode terminal connected to the busbar component. Therefore, thermally connecting the heat dissipation component to the electrode terminal and / or the busbar component can reduce the temperature of the electrode terminal, reduce the heat transferred from the electrode terminal to the inside of the battery cell, and reduce the impact of the heat generated by the electrode terminal on the internal temperature of the battery cell, thus improving the reliability and cycle life of the battery.

[0102] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0103] For the convenience of description, the following embodiments will take the electrical device as vehicle 1000 as an example for illustration.

[0104] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of vehicle 1000 provided by some embodiments of the present application. A battery device 100 is provided inside vehicle 1000, and the battery device 100 can be arranged at the bottom, head, or tail of vehicle 1000. The battery device 100 can be used for power supply of vehicle 1000. For example, the battery device 100 can be used as the operating power source of vehicle 1000.

[0105] Vehicle 1000 may further include a controller 300 and a motor 200. The controller 300 is used to control the battery device 100 to supply power to the motor 200, for example, to meet the working power requirements during the start, navigation, and driving of vehicle 1000.

[0106] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0107] Figure 2 It is a schematic structural diagram of a perspective of the battery device 100 according to some embodiments of the present application; Figure 3 It is an exploded schematic diagram of the battery device 100 according to some embodiments of the present application.

[0108] Please refer to Figure 2 and Figure 3 , the battery device 100 may include a box body 20 and a plurality of battery cells 10, and the box body 20 is used to accommodate the plurality of battery cells 10.

[0109] Among them, an accommodation space 23 for accommodating the plurality of battery cells 10 is formed inside the box body 20. The box body 20 can adopt various structures. In some embodiments, the box body 20 may include a first box body 21 and a second box body 22, and the first box body 21 and the second box body 22 are buckled with each other. The first box body 21 and the second box body 22 can be various shapes, such as a cuboid, a cylinder, etc. The first box body 21 can be a hollow structure with one side open, and the second box body 22 can also be a hollow structure with one side open. The open side of the second box body 22 and the open side of the first box body 21 are buckled with each other, then a box body 20 with a closed space is formed. It can also be that the first box body 21 is a hollow structure with one side open, the second box body 22 is a plate-like structure, and the second box body 22 is buckled on the open side of the first box body 21, then a box body 20 with an accommodation space 23 is formed.

[0110] In the battery device 100, the battery cells 10 can be one or multiple. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 10. It can be that multiple battery cells 10 are first connected in series, parallel or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, parallel or in a mixed connection to form a whole and are accommodated in the box body 20. It can also be that all the battery cells 10 are directly connected in series, parallel or in a mixed connection together, and then the whole formed by all the battery cells 10 is accommodated in the box body 20.

[0111] In some embodiments, the battery device 100 may further include a busbar component 30, and the multiple battery cells 10 can be electrically connected through the busbar component 30 to achieve series, parallel or mixed connection of the multiple battery cells 10. The busbar component 30 can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0112] Please refer to Figure 4 , Figure 4Exploded schematic view of the battery cell 10 according to some embodiments of the present application. The battery cell 10 may include a housing 111, an electrode assembly 12, an end cap 112, electrode terminals, and other functional components.

[0113] The housing 111 and the end cap 112 together form the outer shell 11 of the battery cell 10.

[0114] The housing 111 is a component for accommodating the electrode assembly 12. The housing 111 may be a hollow structure with an opening at one end, or a hollow structure with openings 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 of various shapes, such as a cylinder, a cuboid, etc. Exemplarily, in Figure 3 it, the housing 111 is a cuboid.

[0115] The end cap 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 cap 112 covers the opening of the housing 111, and the end cap 112 and the housing 111 together define a sealed space for accommodating the electrode assembly 12, the electrolyte, and other functional components. The shape of the end cap 112 can be adapted to the shape of the housing 111. For example, if the housing 111 is a cuboid structure, the end cap 112 is a rectangular plate-like structure adapted to the housing 111. Another example is that if the housing 111 is a cylinder structure, the end cap 112 is a circular plate-like structure adapted to the housing 111. The material of the end cap 112 can also be various. Exemplarily, the end cap 112 can be made of a metal material, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 112 can be the same as or different from the material of the housing 111.

[0116] In the battery cell 10, there can be one or two end caps 112. If the housing 111 is a hollow structure with an opening at one end, then one end cap 112 is correspondingly provided; if the housing 111 is a hollow structure with openings at both ends, then two end caps 112 are correspondingly provided, and the two end caps 112 respectively cover the two openings of the housing 111.

[0117] The electrode terminals are components for leading out current. The electrode terminals can be arranged on the end cap 112. There can be two electrode terminals, namely the first electrode terminal 14a and the second electrode terminal 14b, and the polarities of the two electrode terminals are opposite. If the first electrode terminal 14a is the positive terminal, then the second electrode terminal 14b is the negative terminal; if the first electrode terminal 14a is the negative terminal, then the second electrode terminal 14b is the positive terminal.

[0118] The embodiments of the present application provide 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 will be elaborated in detail below with reference to the accompanying drawings.

[0119] Figure 5 A schematic structural view of another perspective of the battery device 100 according to some embodiments of the present application; Figure 6 is Figure 5 A cross-sectional view along A-A; Figure 7 A schematic view of a perspective of a partial internal structure of the battery device 100 according to some embodiments of the present application; Figure 8 A schematic view of another perspective of a partial internal structure of the battery device 100 according to some embodiments of the present application; Figure 9 A schematic structural view of the battery cell 10 according to some embodiments of the present application; Figure 10 is Figure 6 An enlarged view of part A in

[0120] Referring to Figures 5 to 10 , embodiments of the present application provide a battery device 100. The battery device 100 includes a plurality of battery cells 10, a first busbar component 30a, and a heat dissipation component 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. The first electrode terminal 14a is disposed on a first outer end surface 113 of the housing 11. The first busbar component 30a is connected to the first electrode terminal 14a and is used to achieve electrical connection between different battery cells 10. The heat dissipation component 80 is thermally connected to the first electrode terminal 14a and / or the first busbar component 30a.

[0121] The first outer end surface 113 is the outer surface of a wall portion of the housing 11. In some embodiments, the first outer end surface 113 may be the outer surface of the end cap 112. In some other embodiments, the first outer end surface 113 may also be the outer surface of the side wall of the housing 111 or the outer surface of the bottom wall of the housing 111.

[0122] The first electrode terminal 14a may be a positive terminal, or the first electrode terminal 14a may also be a negative terminal.

[0123] The heat dissipation component 80 is a component for dissipating heat from the first electrode terminal 14a. The heat dissipation component 80 may be a wall portion of the box body 20 (such as Figure 10 shown), or the heat dissipation component 80 may also be a cooling plate accommodated in the box body 20 (such as Figure 12 shown), or the heat dissipation component 80 may also be a heat sink, etc. (not shown in the figure).

[0124] The heat dissipation component 80 may be thermally connected only to the first electrode terminal 14a, or the heat dissipation component 80 may be thermally connected only to the first busbar component 30a, or the heat dissipation component 80 may also be thermally connected to both the first electrode terminal 14a and the first busbar component 30a simultaneously.

[0125] The heat dissipation component 80 can be thermally connected to the first electrode terminal 14a in various ways, as long as heat exchange between the first electrode terminal 14a and the heat dissipation component 80 can be satisfied. The first electrode terminal 14a can be in direct contact with the heat dissipation component 80. To improve the thermal conductivity efficiency, high-thermal-conductivity materials or components such as thermal pads and thermal adhesives can be provided between the first electrode terminal 14a and the heat dissipation component 80.

[0126] The heat dissipation component 80 can be thermally connected to the first bus bar component 30a in various ways, as long as heat exchange between the first bus bar component 30a and the heat dissipation component 80 can be satisfied. The first bus bar component 30a can be in direct contact with the heat dissipation component 80. To improve the thermal conductivity efficiency, high-thermal-conductivity materials or components such as thermal pads and thermal adhesives can be provided between the first bus bar component 30a and the heat dissipation component 80.

[0127] The material of the heat dissipation component 80 includes but is not limited to metals, plastics, etc., as long as heat dissipation of the first electrode terminal 14a can be achieved.

[0128] In the above technical solution, the heat dissipation component 80 is thermally connected to the first electrode terminal 14a, and the heat dissipation component 80 can dissipate heat from the first electrode terminal 14a and reduce the temperature of the first electrode terminal 14a. By thermally connecting the heat dissipation component 80 to the first bus bar component 30a, the heat dissipation component 80 can dissipate heat from the first bus bar component 30a and reduce the temperature of the first bus bar component 30a, thereby reducing the temperature of the first electrode terminal 14a connected to the first bus bar component 30a. Therefore, thermally connecting the heat dissipation component 80 to the first electrode terminal 14a and / or the first bus bar component 30a can reduce the temperature of the first electrode terminal 14a, reduce the heat transferred from the first electrode terminal 14a to the inside of the battery cell 10, and reduce the influence of the heat generation of the first electrode terminal 14a on the internal temperature of the battery cell 10, thus improving the reliability and cycle life of the battery device 100.

[0129] In some embodiments, along the direction perpendicular to the first outer end face 113, the ratio range of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end face 113 is 0.25 to 0.45.

[0130] The maximum cross-sectional area of the first electrode terminal 14a refers to the area of the maximum cross-section of the first electrode terminal 14a in the direction perpendicular to the first outer end face 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.

[0131] Exemplarily, the ratio of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end face 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.

[0132] 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 face 113 is greater than 0.25, and the proportion of the first electrode terminal 14a on the first outer end face 113 is not too small, which facilitates the assembly of the first electrode terminal 14a to the housing 11 and facilitates the heat dissipation component 80 to dissipate heat from 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 face 113 is less than 0.45, and the proportion of the first electrode terminal 14a on the first outer end face 113 is not too large, leaving more area for other components to be arranged on the first end face. Therefore, the ratio range of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end face 113 is from 0.25 to 0.45, which can balance the heat dissipation of the first electronic terminal and the arrangement of other components.

[0133] In some embodiments, the ratio range of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end face 113 is 0.3 to 0.4. It can further balance the heat dissipation of the first electronic terminal and the arrangement of other components.

[0134] Exemplarily, the ratio of the maximum cross-sectional area of the first electrode terminal 14a to the area of the first outer end face 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, and any value therebetween, etc.

[0135] In some embodiments, along the direction perpendicular to the first outer end face 113, the maximum cross-sectional area of the first electrode terminal 14a is 400 mm 2 ~2500 mm 2 .

[0136] Exemplarily, the maximum cross-sectional area of the first electrode terminal 14a can be 400 mm 2 、600 mm 2 、700 mm 2 、900 mm 2 、1000 mm 2 、1300 mm 2 、1500 mm 2 、1700 mm 2 、2000 mm 2 、2100 mm 2 、2300 mm 2, 2500mm 2 and any value therebetween, etc.

[0137] In some embodiments, the area of the first outer end face 113 is 4000mm 2 ~16000mm 2 .

[0138] Exemplarily, the area of the first outer end face 113 can be 4000mm 2 , 5000mm 2 , 6000mm 2 , 7000mm 2 , 8000mm 2 , 9000mm 2 , 10000mm 2 , 11000mm 2 , 12000mm 2 , 13000mm 2 , 14000mm 2 , 16000mm 2 and any value therebetween, etc.

[0139] In some embodiments, the heat dissipation component 80 is thermally connected to the first electrode terminal 14a. The specific implementation of the thermal connection between the heat dissipation component 80 and the first electrode terminal 14a will be described in detail below.

[0140] Referring to Figure 9 , and in combination with referring to Figure 10 , in some embodiments, the heat dissipation component 80 is thermally connected to the first electrode terminal 14a. The surface of the first electrode terminal 14a exposed outside the housing 11 includes a first connection area 1411 and a second connection area 1412. The first connection area 1411 is connected to the first busbar component 3ia, and the second connection area 1412 is thermally connected to the heat dissipation component 80.

[0141] The first electrode terminal 14a has a second outer end face 141 facing away from the inside of the battery cell 10. The first connection area 1411 can be a part of the second outer end face 141, the second connection area 1412 can be a part of the second outer end face 141, or the second outer end face 141 can be divided into two parts, one part being the first connection area 1411 and the other part being the second connection area 1412.

[0142] The first electrode terminal 14a may protrude from the first outer end face 113 in a direction away from the interior of the battery cell 10. At this time, the first electrode terminal 14a has a second outer end face 141 and a side face surrounding the second outer end face 141. The first connection region 1411 may be a part of the second outer end face 141 or a part of the side face, and the second connection region 1412 may be a part of the second outer end face 141 or a part of the side face.

[0143] In the above technical solution, the first electrode terminal 14a includes a first connection region 1411 and a second connection region 1412. The first connection region 1411 is connected to the first bus bar member 30a, and the second connection region 1412 is thermally connected to the heat dissipation member 80. The first connection region 1411 facilitates current conduction, and the second connection region 1412 facilitates heat dissipation.

[0144] In some embodiments, the first direction Z is a direction perpendicular to the first outer end face 113. The dimension of the first outer end face 113 along the second direction X is greater than the dimension along the third direction Y. The second direction X, the third direction Y, and the first direction Z are perpendicular to each other in pairs. The first connection region 1411 is closer to the middle of the first outer end face 113 along the second direction X.

[0145] It can be understood that the dimension of the first outer end face 113 along the second direction X is longer, and the dimension of the first outer end face 113 along the third direction Y is smaller.

[0146] Optionally, the first outer end face 113 is rectangular. The length direction of the first outer end face 113 is parallel to the second direction X, and the width direction of the first outer end face 113 is parallel to the third direction Y.

[0147] In the above technical solution, compared with the second connection region 1412, the first connection region 1411 is closer to the middle of the first outer end face 113 along the second direction X, which facilitates the arrangement of the first bus bar member 30a to a position close to the middle of the first outer end face 113 along the second direction X.

[0148] Refer to Figure 9 , in some embodiments, a second electrode terminal 14b is further provided on the first outer end face 113. The first connection region 1411 is located on the side of the second connection region 1412 closer to the second electrode terminal 14b, so that the first connection region 1411 is arranged close to the second electrode terminal 14b, which facilitates the connection of the first connection region 1411 and the second electrode terminal 14b to other electrical connectors (such as a circuit board) together.

[0149] The structure of the second electrode terminal 14b may be the same as or different from that of the first electrode terminal 14a, which will not be elaborated here.

[0150] In some embodiments, the second electrode terminal 14b is mirror-symmetrical to the first electrode terminal 14a, and the axis of symmetry between the second electrode terminal 14b and the first electrode terminal 14a is parallel to the third direction Y.

[0151] In some embodiments, the heat dissipation component 80 is thermally connected to the first electrode terminal 14a. The first direction Z is perpendicular to the first outer end face 113. The first electrode terminal 14a includes a second outer end face 141 facing away from the first outer end face 113 along the first direction Z. The second outer end face 141 includes a first connection area 1411 and a second connection area 1412. The first connection area 1411 is connected to the first bus bar component 30a, and the second connection area 1412 is thermally connected to the heat dissipation component 80. When projected along the first direction Z on the projection plane perpendicular to the first direction Z, the ratio of the area of the first connection area 1411 to the area of the second outer end face 141 ranges from 0.3 to 0.7.

[0152] Exemplarily, the ratio of the area of the first connection area 1411 to the area of the second outer end face 141 can be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, and any value therebetween, etc.

[0153] In the above technical solution, the ratio of the area of the first connection area 1411 to the area of the second outer end face 141 is greater than 0.3, and the proportion of the first connection area 1411 is not too small, which is beneficial to meeting the overcurrent requirement. The ratio of the area of the first connection area 1411 to the area of the second outer end face 141 is less than 0.7, and the proportion of the first connection area 1411 is not too large, leaving a relatively large area for the second connection area 1412, which is beneficial to the heat dissipation of the first electrode terminal 14a. Therefore, the ratio of the area of the first connection area 1411 to the area of the second outer end face 141 ranges from 0.3 to 0.7, which can balance the overcurrent and heat dissipation of the first electrode terminal 14a.

[0154] In some embodiments, the heat dissipation component 80 is thermally connected to the first electrode terminal 14a. The first direction Z is perpendicular to the first outer end face 113. The first electrode terminal 14a includes a second outer end face 141 facing away from the first outer end face 113 along the first direction Z. The second outer end face 141 includes a first connection area 1411 and a second connection area 1412. The first connection area 1411 is connected to the first bus bar component 30a, and the second connection area 1412 is thermally connected to the heat dissipation component 80. When projected along the first direction Z on the projection plane perpendicular to the first direction Z, the ratio of the area of the second connection area 1412 to the area of the second outer end face 141 ranges between 0.3 and 0.7.

[0155] Illustratively, the ratio of the area of the second connection region 1412 to the area of the second outer end surface 141 may be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, or any value therebetween.

[0156] In the above technical solution, the ratio of the area of second connection region 1412 to the area of second outer end surface 141 is greater than 0.3, ensuring that the second connection region 1412 does not occupy a significant portion of the space, thereby facilitating heat dissipation from first electrode terminal 14a. The ratio of the area of second connection region 1412 to the area of second outer end surface 141 is less than 0.7, ensuring that the second connection region 1412 does not occupy a significant portion of the space, leaving a larger area for first connection region 1411, thus facilitating flow of current through first electrode terminal 14a. Therefore, the ratio of the area of second connection region 1412 to the area of second outer end surface 141 ranges from 0.3 to 0.7, ensuring a balanced flow and heat dissipation for first electrode terminal 14a.

[0157] In some embodiments, a ratio of an area of the first connection region 1411 to an 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 .

[0158] In some embodiments, the area of the first connection region 1411 is 120 mm 2 ~1700mm 2 .

[0159] For example, the area of the first connection region 1411 may be 120 mm 2 , 200mm 2 , 400mm 2 , 600mm 2 , 800mm 2 , 1000mm 2 , 1200mm 2 , 1300mm 2 , 1500mm 2 , 1700mm 2 and any value in between.

[0160] In some embodiments, the area of the second connection region 1412 is 120 mm 2 ~1700mm 2 .

[0161] For example, the area of the second connection region 1412 may be 120 mm 2 , 200mm 2 , 400mm 2 , 600mm 2 , 800mm 2, 1000 mm 2 , 1200 mm 2 , 1300 mm 2 , 1500 mm 2 , 1700 mm 2 and any value therebetween.

[0162] Figure 11 FIG. is a partial structural schematic diagram of the battery cell 10 according to some embodiments of the present application.

[0163] Referring to Figure 11 , and in combination with reference to Figure 10 , in some embodiments, the heat dissipation component 80 is thermally connected to the first electrode terminal 14a. The first direction Z is perpendicular to the first outer end face 113. The first electrode terminal 14a includes a third outer end face 142 and a fourth outer end face 143 that face away from the first outer end face 113 along the first direction Z. The third outer end face 142 is connected to the first current collecting component 30a, and the fourth outer end face 143 is thermally connected to the heat dissipation component 80. The distance between the third outer end face 142 and the first outer end face 113 is greater than the distance between the fourth outer end face 143 and the first outer end face 113.

[0164] It can be understood that there is a step between the third outer end face 142 and the fourth outer end face 143. When the first outer end face 113 is placed horizontally, the third outer end face 142 is higher than the fourth outer end face 143.

[0165] If the third outer end face 142 is a flat surface, the distance measured from any point between the third outer end face 142 and the first outer end face 113 is the distance between the third outer end face 142 and the first outer end face 113. If the fourth outer end face 143 is a flat surface, the distance measured from any point between the fourth outer end face 143 and the first outer end face 113 is the distance between the fourth outer end face 143 and the first outer end face 113. <3000430>

[0166] If the third outer end face 142 is an uneven surface, the distance measured from the highest position of the protrusion is the distance between the third outer end face 142 and the first outer end face 113. If the fourth outer end face 143 is an uneven surface, the distance measured from the highest position of the protrusion is the distance between the fourth outer end face 143 and the first outer end face 113.

[0167] In the above technical solution, the third outer end face 142 is used to meet the overcurrent of the first electrode terminal 14a, and the fourth outer end face 143 is used to meet the heat dissipation of the first electrode terminal 14a. The distance between the third outer end face 142 and the first outer end face 113 is greater than the distance between the fourth outer end face 143 and the first outer end face 113, that is, compared with the fourth outer end face 143, the third outer end face 142 is higher, which facilitates the connection between the first connection area 1411 and the first bus bar component 30a. For example, the first connection area 1411 can provide sufficient penetration depth for welding, facilitating the welding of the first bus bar component 30a at the first connection area 1411. Compared with the third outer end face 142, the fourth outer end face 143 is lower, which is beneficial to reducing the space occupied by the first electrode terminal 14a. Compared with the third outer end face 142, the fourth outer end face 143 is lower, which is beneficial to reducing the space occupied by the first electrode terminal 14a.

[0168] In some embodiments, the ratio range of the area of the fourth outer end face 143 to the area of the first outer end face 113 is 0.075 to 0.315.

[0169] Exemplarily, the ratio of the area of the fourth outer end face 143 to the area of the first outer end face 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, and any value therebetween, etc.

[0170] In the above technical solution, the ratio of the area of the fourth outer end face 143 to the area of the first outer end face 113 is greater than 0.075, and the proportion of the fourth outer end face 143 is not too small, which is beneficial to meeting the heat dissipation of the first electrode terminal 14a. The ratio of the area of the fourth outer end face 143 to the area of the first outer end face 113 is less than 0.315, and the proportion of the fourth outer end face 143 is not too large, leaving more area for arranging other components on the first outer end face 113, facilitating the arrangement of other components on the first outer end face 113. Therefore, the ratio range of the area of the fourth outer end face 143 to the area of the first outer end face 113 is 0.075 to 0.315, which can balance the heat dissipation of the first electrode terminal 14a and the arrangement of other components on the first outer end face 113.

[0171] In some embodiments, the ratio range of the area of the fourth outer end face 143 to the area of the first outer end face 113 is 0.1 to 0.27, which can further balance the heat dissipation of the first electrode terminal 14a and the arrangement of other components on the first outer end face 113.

[0172] Exemplarily, the ratio of the area of the fourth outer end face 143 to the area of the first outer end face 113 can be 0.1, 0.12, 0.14, 0.16, 0.18, 0.2, 0.22, 0.24, 0.26, 0.27, and any value therebetween, etc.

[0173] In some embodiments, the heat dissipation component 80 is thermally connected to the first bus component 30a. Refer to Figure 10 , in some embodiments, along a direction perpendicular to the first outer end face 113, the first bus component 30a includes opposite first surface 30a1 and second surface 30a2, the first surface 30a1 is connected to the first electrode terminal 14a, and the second surface 30a2 is thermally connected to the heat dissipation component 80.

[0174] 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 bus component 30a.

[0175] In the above technical solution, the first surface 30a1 is connected to the first electrode terminal 14a, and the second surface 30a2 is thermally connected to the heat dissipation component 80, making the connection between the bus component 30 and the first electrode terminal 14a and the heat dissipation component 80 more convenient.

[0176] The structural form of the heat dissipation component 80 can be diverse. The specific structure of the heat dissipation component 80 will be elaborated in detail below with reference to the accompanying drawings.

[0177] Figure 12 For Figure 10 is a schematic structural diagram of another embodiment of the heat dissipation component 80 in

[0178] Refer to Figure 12 , in some embodiments, the heat dissipation component 80 is received in the box body 20.

[0179] Refer to Figure 12 , in some embodiments, a receiving cavity 81 for receiving a heat exchange medium is formed inside the heat dissipation component 80. The receiving cavity 81 can receive the heat exchange medium to obtain a heat dissipation component 80 with relatively high heat dissipation capacity.

[0180] It should be understood that the receiving cavity 81 is used to receive a cooling medium to dissipate heat from 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.

[0181] In some embodiments, the heat dissipation component 80 includes a connecting portion, at least part of the connecting portion is made of a metal material, and the heat dissipation component 80 is connected to the first electrode terminal 14a through an insulating thermal conductive adhesive.

[0182] In some embodiments, the heat dissipation component 80 includes a connecting portion, at least part of the connecting portion is made of a metal material, and the heat dissipation component 80 is connected to the first bus component 30a through an insulating thermal conductive adhesive.

[0183] The material of the connecting part includes, but is not limited to, aluminum alloy material, brazed composite material, etc. In some embodiments, the material of the connecting part is 3-series aluminum alloy. In some embodiments, the material of the connecting part is 3003 aluminum alloy.

[0184] In the above technical solution, the heat dissipation component 80 includes a connecting part, and at least part of the connecting part is made of a metal material. The metal material has a high heat conduction efficiency and can improve the heat dissipation efficiency of the first electrode terminal 14a. The heat dissipation component 80 is connected to the first electrode terminal 14a and / or the first busbar component 30a through an insulating thermal conductive adhesive, and the insulating thermal conductive adhesive can improve the heat conduction efficiency and reduce the short-circuit risk between the heat dissipation component 80 and the first electrode terminal 14a and / or the first busbar component 30a.

[0185] Refer to Figure 10 , in some embodiments, the battery device 100 further includes a box body 20, and the battery cells 10 and the first busbar component 30a are both accommodated in the box body 20. The heat dissipation component 80 is the first box wall 24 of the box body 20.

[0186] Understandably, the first box wall 24 is thermally connected to the first electrode terminal 14a and / or the first busbar component 30a. Using the first box wall 24 to dissipate heat from the first electrode terminal 14a simplifies the number of components and saves the manufacturing cost of the battery device 100.

[0187] Refer to Figure 10 , in some embodiments, the battery device 100 further includes a first thermal management component 70. The first thermal management component 70 is disposed outside the first box wall 24 and is thermally connected to the first box wall 24. A first flow channel 71 for accommodating a heat exchange medium is formed inside the first thermal management component 70.

[0188] The first thermal management component 70 is a component for accommodating a heat exchange medium to adjust the temperature inside the box body 20. The heat exchange medium here can be a liquid or a gas, and adjusting the temperature means heating or cooling the plurality of battery cells 10. In the case of cooling or lowering the temperature of the battery cells 10, the first thermal management component is used to accommodate a cooling fluid to lower the temperature of the plurality of battery cells 10. At this time, the first thermal management component can also be called a cooling component, a cooling system or a cooling plate, etc., and the fluid it accommodates can also be called a cooling medium or a cooling fluid, and more specifically, it can be called a coolant or a cooling gas. In addition, the first thermal management component can also be used for heating to raise the temperature of the plurality of battery cells 10. Optionally, the fluid can be circulated to achieve a better temperature adjustment effect. Optionally, the fluid can be water, a mixture of water and ethylene glycol, or air, etc.

[0189] The heat conduction connection mode between the first heat management component 70 and the first box wall 24 can be various. For example, the first heat management component 70 can be directly in contact with the first box wall 24. To improve the heat conduction efficiency, heat conduction pads, insulating heat-conducting adhesives and other materials or components with high heat conduction coefficients can be arranged between the first heat management component 70 and the first box wall 24.

[0190] In the above technical solution, the first heat management component 70 is heat-conductively connected to the first box wall 24, so that the first heat management component 70 can exchange heat with the first box wall 24, thereby regulating the temperature inside the box body 20 and improving the reliability of the battery device 100.

[0191] The first heat management component 70 is arranged on the outer side of the first box wall 24, that is, the first heat management component 70 is located outside the box body 20. In this way, the risk of short circuit of the electrical connection caused by the leakage of the heat exchange medium inside the box body 20 can be reduced, thereby improving the reliability of the battery device 100.

[0192] In some embodiments, a groove 241 is formed on the outer side surface of the first box wall 24, and at least a part of the first heat management component 70 is received in the groove 241.

[0193] The groove 241 is a recessed structure formed on the outer side surface of the first box wall 24, and the outer side surface of the first box wall 24 is the side of the first box wall 24 facing outside the box body 20. The groove 241 can be formed by cutting on the outer side surface of the first box wall 24, or the groove 241 can be formed by stamping the first box wall 24.

[0194] The extending path of the groove 241 can be various, as long as the first heat management component 70 can cover a plurality of battery cells 10 to a large extent.

[0195] In the above technical solution, a groove 241 is formed on the outer side surface of the first box wall 24, and at least a part of the first heat management component 70 is received in the groove 241, so that the first box wall 24 and the first heat management component 70 can share a part of the space, improving the space utilization rate of the battery device 100.

[0196] In some embodiments, a convex portion 242 is formed on the inner side surface of the first box wall 24 corresponding to the position of the groove 241, and the convex portion 242 is heat-conductively connected to the first electrode terminal 14a and / or the first busbar component 30a.

[0197] The inner side surface of the first box wall 24 refers to the surface of the first box wall 24 facing the inside of the box body 20.

[0198] The first box body 21 wall can be formed by stamping, so as to simultaneously form a groove 241 on the outer side surface of the first box wall 24 and form a convex portion 242 corresponding to the groove 241 on the inner side surface of the first box wall 24.

[0199] In the above technical solution, a convex portion 242 is formed on the inner side surface of the first box wall 24 corresponding to the position of the groove 241. The convex portion 242 can improve the structural strength of the first box wall 24, and at the same time, it is more convenient for the convex portion 242 to be thermally connected to the first electrode terminal 14a and / or the first bus bar member 30a.

[0200] Figure 13 For Figure 10 a structural schematic diagram of another embodiment of the heat dissipation component 80.

[0201] Referring to Figure 13 , the heat dissipation component 80 is the first box wall 24 of the box body 20. In some embodiments, a second flow channel 243 for accommodating a heat exchange medium is formed inside the first box wall 24.

[0202] It can be understood that the second flow channel 243 is a cavity structure formed inside the first box wall 24.

[0203] The forming method of the first box wall 24 includes but is not limited to extrusion molding, injection molding, etc. The first box wall 24 may further include two plate bodies arranged in a stacked manner, and the second flow channel 243 is defined between the two plate bodies.

[0204] In the above technical solution, a second flow channel 243 for accommodating a heat exchange medium is formed inside the first box wall 24, which simplifies the number of components, and a heat dissipation component 80 with higher heat dissipation capacity can be obtained without additionally arranging the first heat management component 70.

[0205] When the first outer end face 113 is located at the top of the housing 111 of the battery cell 10, the above-mentioned first heat management component 70, the first box wall 24, and the heat dissipation component 80 are all located on the top wall of the battery cell 10. 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.

[0206] To further improve the reliability of the battery device 100, other heat management components can also be provided to be thermally connected to the side surface and / or the bottom of the battery cell 10 to improve the temperature regulation efficiency of the battery cell 10.

[0207] Referring to Figure 4 , Figure 7 and Figure 8 , in some embodiments, the battery cell 10 further includes a fifth outer end face 114. The fifth outer end face 114 and the first outer end face 113 are located on the same battery cell 10 and are opposite or intersect. The battery device 100 further includes a second heat management component 90, and the second heat management component 90 is thermally connected to the second outer end face 141.

[0208] The fifth end face can be the end face opposite to the first outer end face 113, and the fifth outer end face 114 can also be the end face intersecting with the first outer end face 113.

[0209] In some embodiments, the first outer end face 113 is the outer surface of the end cover 112, and the fifth outer end face 114 may be the outer surface of the bottom wall of the housing 111. At this time, the fifth outer end face 114 is opposite to the first outer end face 113.

[0210] In some embodiments, the first outer end face 113 is the outer surface of the end cover 112, and the fifth outer end face 114 may be the outer surface of a side wall of the housing 111. At this time, the fifth outer end face 114 intersects with the first outer end face 113.

[0211] Exemplarily, referring to Figure 7 and Figure 8 , the fifth outer end face 114 intersects with the first outer end face 113. In some embodiments, a plurality of battery cells 10 are arranged in a rectangular array, and a third flow channel (not shown in the figure) for accommodating a heat exchange medium is formed inside the second heat management component 90. The second heat management component 90 may be disposed between two adjacent rows or two adjacent columns of battery cells 10. The second heat management component 90 is used to adjust the temperature of the plurality of battery cells 10.

[0212] In the above technical solution, the second heat management component 90 adjusts the temperature of the battery cells 10, which can further improve the reliability of the battery device 100.

[0213] In some embodiments, the fifth outer end face 114 is the outer end face with the largest area of the battery cell 10.

[0214] Exemplarily, the battery cell 10 is in the shape of a cuboid. The battery cell 10 includes a housing 111 and an end cover 112. The housing 111 includes four side walls connected end to end. The four side walls include two narrow faces arranged along the second direction X and two large faces arranged opposite to each other along the third direction Y. The first outer end face 113 is the outer surface of the end cover 112, and the fifth outer end face 114 is the outer surface of the large face of the housing 111.

[0215] In the above technical solution, there is a large heat exchange area between the fifth outer end face 114 and the second heat management component 90, which can improve the heat exchange efficiency.

[0216] An embodiment of the present application further provides an electrical device. The electrical device includes the above-mentioned battery device 100, and the battery device 100 is used to provide electric energy.

[0217] Referring to Figures 2 to 11, an embodiment of the present application further provides a battery device 100, which includes a box body 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 body 20 includes a first box body 21 and a first box wall 24. The first box body 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 surface of the first box wall 24, and a convex portion 242 corresponding to the groove 241 is formed on the inner side surface of the first box wall 24. A plurality of battery cells 10 are accommodated in the box body 20. The plurality of battery cells 10 are arranged in a rectangular array, and the rectangular array of the plurality of battery cells 10 is M rows and N columns. Each row includes a plurality of battery cells 10 arranged along the second direction X, and each column includes a plurality of battery cells 10 arranged along the third direction Y, where M is greater than or equal to 2 and N is greater than or equal to 2. A second thermal management component 90 is disposed between adjacent two rows of battery cells 10, and a third flow channel for accommodating a heat exchange medium is formed inside the second thermal management component 90. The second thermal management component 90 extends along the second direction X. The first thermal management component 70 is disposed on the outer side surface of the first box cover, and the first thermal management component 70 is located outside the box body 20. At least a part of the first thermal management component 70 is accommodated in the groove 241. The first thermal management component 70 and the first box cover are thermally connected by a thermal conductive adhesive. The battery cell 10 includes an electrode assembly 12, a housing 11, a first electrode terminal 14a, and a second electrode terminal 14b. The housing 11 is in a cuboid shape and includes a housing body 111 and an end cover 112. The housing body 111 is open at the top, and the end cover 112 covers the opening of the housing body 111. The electrode assembly 12 is accommodated in the housing 11. The housing body 111 includes four side walls connected end to end. The four side walls include two narrow faces arranged opposite to each other 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 thermally connected to the large face. Both the first electrode terminal 14a and the second electrode terminal 14b are disposed on the end cover 112, and the first electrode terminal 14a and the second electrode terminal 14b are spaced apart along the second direction X. The first busbar component 30a is connected to the first electrode terminal 14a and is used to realize the electrical connection between different battery cells 10. The second busbar component 30b is connected to the second electrode terminal 14b and is used to realize the electrical connection between different battery cells 10. The first electrode terminal 14a and the second electrode terminal 14b are mirror-symmetrical, and 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 in the middle of the battery cell 10 along the second direction X.The first direction Z is perpendicular to the first outer end face 113. The first electrode terminal 14a includes a third outer end face 142 and a fourth outer end face 143 that face away from the first outer end face 113 along the first direction Z. The third outer end face 142 and the fourth outer end face 143 are arranged along the second direction X. The third outer end face 142 is closer to the second electrode terminal 14b than the fourth outer end face 143. The third outer end face 142 is connected to the first bus component 30a. The fourth outer end face 143 is thermally connected to the heat dissipation component 80. The distance between the third outer end face 142 and the first outer end face 113 is greater than the distance between the fourth outer end face 143 and the first outer end face 113. A step is formed between the third outer end face 142 and the fourth outer end face 143. Along the first direction Z, the first bus component 30a includes opposite first surface 30a1 and second surface 30a2. The first surface 30a1 is welded to the third outer end face 142, and the second surface 30a2 is thermally connected to the heat dissipation component 80 through an insulating thermal conductive adhesive. The fourth outer end face 143 is thermally connected to the convex portion 242 of the first box wall 24. In the same projection plane perpendicular to the second direction X, the orthographic projection of the convex portion 242 overlaps with the orthographic projection of the first electrode terminal 14a, so that the first end cover 112 sinks, and thus the first end cover 112 and the first electrode terminal 14a can share a part of the space in the first direction Z, reducing the space occupation.

[0218] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0219] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that, Comprising: A plurality of battery cells, each battery cell including a housing, an electrode assembly, and a first electrode terminal. The housing forms a receiving space, the electrode assembly is located in the receiving space, and the first electrode terminal is disposed on a first outer end surface of the housing. A first busbar component, connected to the first electrode terminal and used to achieve electrical connection between different battery cells. Wherein, the battery device further includes a heat dissipation component, and the heat dissipation component is thermally connected to the first electrode terminal and / or the first busbar component.

2. The battery device according to claim 1, characterized in that, In a direction perpendicular to the first outer end surface, the ratio range of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end surface is 0.25 to 0.

45.

3. The battery device according to claim 2, characterized in that, The ratio range of the maximum cross-sectional area of the first electrode terminal to the area of the first outer end surface is 0.3 to 0.

4.

4. The battery device according to claim 1, characterized in that, The heat dissipation component is thermally connected to the first electrode terminal. The surface of the first electrode terminal exposed outside the housing includes a first connection region and a second connection region. The first connection region is connected to the first busbar component, and the second connection region is thermally connected to the heat dissipation component.

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

6. The battery device according to claim 4, characterized in that, A second electrode terminal is further disposed on the first outer end surface. The first connection region is located on the side of the second connection region closer to the second electrode terminal.

7. The battery device according to any one of claims 1 to 6, characterized in that, The heat dissipation component is thermally connected to the first electrode terminal. The first direction is a direction perpendicular to the first outer end surface. The first electrode terminal includes a second outer end surface facing away from the first outer end surface along the first direction. The second outer end surface includes a first connection region and a second connection region. The first connection region is connected to the first busbar component, and the second connection region is thermally connected to the heat dissipation component. In a projection plane perpendicular to the first direction and projected along the first direction, the ratio range of the area of the first connection region to the area of the second outer end surface is 0.3 to 0.

7.

8. The battery device according to any one of claims 1 to 6, characterized in that, The heat dissipation component is thermally connected to the first electrode terminal. The first direction is a direction perpendicular to the first outer end surface. The first electrode terminal includes a second outer end surface facing away from the first outer end surface along the first direction. The second outer end surface includes a first connection region and a second connection region. The first connection region is connected to the first busbar component, and the second connection region is thermally connected to the heat dissipation component. In a projection plane perpendicular to the first direction and projected along the first direction, the ratio range of the area of the second connection region to the area of the second outer end surface is 0.3 to 0.

7.

9. The battery device according to any one of claims 1-6, characterized in that, The heat dissipation component is thermally connected to the first electrode terminal. The first direction is perpendicular to the first outer end face. The first electrode terminal includes a third outer end face and a fourth outer end face facing away from the first outer end face along the first direction. The third outer end face is connected to the busbar component, and the fourth outer end face is thermally connected to the heat dissipation component. The distance between the third outer end face and the first outer end face is greater than the distance between the fourth outer end face and the first outer end face.

10. The battery device according to claim 9, characterized in that, The ratio range of the area of the fourth outer end face to the area of the first outer end face is 0.075 to 0.

315.

11. The battery device according to claim 10, characterized in that, The ratio range of the area of the fourth outer end face to the area of the first outer end face is 0.1 to 0.

27.

12. The battery device according to any one of claims 1-6, characterized in that, Along the direction perpendicular to the first outer end face, the first busbar component includes opposite first and second surfaces. The first surface is connected to the first electrode terminal, and the second surface is thermally connected to the heat dissipation component.

13. The battery device according to any one of claims 1-6, characterized in that, An accommodation cavity for accommodating a heat exchange medium is formed inside the heat dissipation component.

14. The battery device according to any one of claims 1-6, characterized in that, The heat dissipation component includes a connecting portion, at least part of which is made of a metal material. The heat dissipation component is connected to the first electrode terminal and / or the first busbar component through an insulating thermal conductive adhesive.

15. The battery device according to any one of claims 1-6, characterized in that, The battery device further includes a box body, and both the battery cell and the first busbar component are accommodated in the box body; The heat dissipation component is the first box wall of the box body.

16. The battery device according to claim 15, characterized in that, The battery device further includes a first heat management component, which is arranged outside the first box wall and is thermally connected to the first box wall. A first flow channel for accommodating a heat exchange medium is formed inside the first heat management component.

17. The battery device according to claim 16, wherein, A groove is formed on the outer side surface of the first box wall, and at least part of the first heat management component is accommodated in the groove.

18. The battery device according to claim 17, characterized in that, A convex portion is formed on the inner side surface of the first box wall corresponding to the position of the groove, and the convex portion is thermally connected to the first electrode terminal and / or the first busbar component.

19. The battery device according to claim 15, characterized in that, A second flow channel for accommodating a heat exchange medium is formed inside the first box wall.

20. The battery device according to any one of claims 1-6, characterized in that, The battery cell further includes a fifth outer end face, which is located on the same battery cell as the first outer end face and is opposite or intersects with it. The battery device further includes a second heat management component, which is thermally connected to the fifth outer end face.

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

22. An electrical device, characterized in that, Including the battery device according to any one of claims 1-21, the battery device is used to provide electrical energy.

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