Battery and electric device

Abstract

The utility model discloses a battery and a power utilization device, and relates to the technical field of batteries, the battery comprises a shell, the shell comprises a shell body and a top cover device, and the shell body and the top cover device enclose to form a containing cavity; the battery cell assembly is arranged in the accommodating cavity and comprises a battery cell main body and a tab extending from one end of the battery cell main body; the top cover device comprises a terminal assembly arranged on the top cover main body, a switching assembly electrically connected with the tab and a terminal assembly fixedly connected with the switching assembly; the fixing structure of the terminal assembly is electrically connected with the switching assembly, the connecting structure is fixedly connected with the top cover body, the plastic structure is arranged between the fixing structure and the connecting structure, the part, extending towards the fixing structure, of the connecting structure is embedded into the plastic structure, and the part, extending towards the connecting structure, of the fixing structure is embedded into the plastic structure. According to the battery, the structural design of the terminal assembly is optimized, so that the assembling efficiency of the battery top cover device and the stability of electrical connection are effectively improved, and meanwhile, the occupation of the internal space of the shell is reduced.

Description

Technical Field

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

[0002] The structural design of the casing is crucial to ensure battery performance, safety and reliability. The casing usually contains key components such as injection holes, explosion-proof valves and top cover devices. The injection holes are used to inject electrolyte during the battery manufacturing process, while the explosion-proof valve is an important part of battery safety performance, which can provide protection when the internal pressure of the battery increases abnormally. The top cover device, as the upper structure of the casing, carries the internal electrical connection function.

[0003] The battery top cover device in the prior art, especially the design of the terminal assembly, has some defects. The one-piece pole terminal design is difficult to assemble and inefficient during the welding process between the pole ear and the connecting piece. This design occupies a lot of space inside the shell, limiting the further improvement of the battery energy density. If the structure of the terminal assembly is not optimized enough, its fixing structure and connection structure may not provide sufficient mechanical strength and electrical connection stability, which may cause connection failure in dynamic application environments, affecting battery performance and safety. Utility Model Content

[0004] The purpose of this application is to provide a battery that effectively improves the assembly efficiency of the battery top cover device and the stability of the electrical connection by optimizing the structural design of the terminal assembly, while reducing the space occupied by the internal shell, providing a solution for improving the battery energy density and ensuring the reliability and safety of the battery in various application environments. Another purpose of this application is to provide an electrical device.

[0005] To achieve the above-mentioned object, the present application provides a battery, comprising a housing, the housing comprising a shell and a top cover device, the shell and the top cover device enclose a receiving cavity; the battery comprises a cell assembly arranged in the receiving cavity, the cell assembly comprises a cell body and a tab extending from one end of the cell body, and the top cover device comprises:

[0006] Top cover body;

[0007] A terminal assembly is arranged on the top cover body;

[0008] A transfer assembly is electrically connected to the tab, and the transfer assembly is fixedly connected to the terminal assembly, wherein the terminal assembly includes:

[0009] A fixed structure electrically connected to the adapter assembly;

[0010] A connecting structure, fixedly connected to the top cover body;

[0011] The plastic structure is arranged between the fixing structure and the connecting structure. The part of the connecting structure extending toward the fixing structure is embedded in the plastic structure, and the part of the fixing structure extending toward the connecting structure is embedded in the plastic structure.

[0012] In some embodiments, the adapter assembly includes:

[0013] An adapter plate, electrically connected to the tab;

[0014] A conductive structure is provided on the adapter plate, and the conductive structure is electrically connected to the terminal assembly.

[0015] In some embodiments, the top cover body is provided with a mounting hole, in which the conductive structure is arranged; the adapter plate is arranged on one side of the top cover body along the first direction; the terminal assembly is arranged on the other side of the top cover body along the first direction and is connected to the adapter assembly.

[0016] In some embodiments, the top cover body is provided with a flange structure, the mounting hole is located inside the flange structure, the terminal assembly is arranged inside the flange structure, and the flange structure is fixedly connected to the connecting structure.

[0017] In some embodiments, the top cover body is further provided with a groove structure, and the groove structure is arranged around the outer periphery of the flange structure.

[0018] In some embodiments, a sink structure is provided inside the flanging structure, the connecting structure is provided on the sink structure, and the connecting structure is fixedly connected to the flanging structure.

[0019] In some embodiments, the interior of the fixed structure is hollow, the conductive structure is disposed inside the fixed structure, and the conductive structure is electrically connected to the fixed structure.

[0020] In some embodiments, the terminal assembly further includes a mounting structure, wherein the mounting structure is located inside the fixing structure and the mounting structure is interference fit with the fixing structure.

[0021] In some embodiments, the terminal assembly further includes a sealing structure, which is disposed in the mounting hole, the sealing structure is in contact and sealed with the fixed structure, and a gap is left between the sealing structure and the conductive structure.

[0022] In some embodiments, the top cover device further includes an insulating component, the insulating component is located between the top cover body and the adapter plate, and the conductive structure penetrates the insulating component along the first direction.

[0023] In some embodiments, the mounting structure is provided with at least one step, the fixing structure is provided with a first counterbore corresponding to the step, and the size of the first counterbore in the first direction is not less than 0.3 mm.

[0024] In some embodiments, the side surface of the step is provided with a groove, and the fixing structure is disposed in the groove.

[0025] In some embodiments, the outer periphery of the fixing structure is provided with a step surface flush with the surface of the plastic structure on the side away from the top cover body. In the first direction, the distance between the surface of the fixing structure on the side away from the top cover body and the surface of the plastic structure on the side away from the top cover body is not less than 0.3 mm; and / or,

[0026] The plastic structure covers the first surface of the connecting structure on the side away from the top cover body. In the radial direction perpendicular to the first direction, the radial distance between the plastic structure on the first surface and the outer edge of the first surface is not less than 0.2 mm; and / or,

[0027] The plastic structure covers the second surface of the connecting structure facing the top cover body. In the radial direction perpendicular to the first direction, the radial distance between the plastic structure on the second surface and the outer edge of the second surface is not less than 0.05 mm and not more than 0.3 mm.

[0028] In some embodiments, the ratio of the projected area of the adapter board in the first direction to the projected area of the fixing structure in the first direction is not less than 0.03 and not more than 0.5; and / or,

[0029] The contact area between the mounting hole and the conductive structure and the cross-sectional area of the conductive structure at the contact surface ratio is not less than 0.1; and / or,

[0030] The ratio of the minimum cross-sectional area of the adapter board in the first direction to the contact area between the fixing structure and the conductive structure satisfies 0.2 to 5; and / or,

[0031] The ratio of the area of the adapter board to the area of the surface of the fixing structure on the side away from the top cover body satisfies 0.03 to 0.5.

[0032] In some embodiments, in the first direction, the ratio of the distance from the flanging structure to the surface of the top cover body on the side away from the battery cell assembly to the size of the conductive structure in the first direction is 0.05 to 0.5; and / or,

[0033] The welding surface width between the flanging structure and the connecting structure satisfies 0.3 to 4 mm; and / or,

[0034] In the radial direction perpendicular to the first direction, the radial thickness of the flanging structure on the side away from the top cover body is less than the radial thickness of the root of the flanging structure. In the first direction,

[0035] the distance between the surface of the flanging structure on the side away from the top cover body and the surface of the connecting structure on the side away from the top cover body is not greater than 0.5 mm; and / or,

[0036] a groove structure is provided on the outer side of the flanging structure, and the depth of the groove structure is not greater than 0.5 mm.

[0037] In some embodiments, the materials of the mounting structure and the fixing structure are different; and / or,

[0038] the surface of the fixing structure on the side away from the top cover body is farther away from the top cover body than the surface of the mounting structure on the side away from the top cover body, and the distance between the two surfaces in the first direction is not less than 0.2 mm.

[0039] In some embodiments, in the first direction, the difference between the size of the conductive structure and the size of the structure formed by the fixing structure, the plastic structure, the top cover body, the insulating component and the adapter board is 0.1 - 2 mm.

[0040] This application also provides an electrical device including the above battery.

[0041] Relative to the above background art, the battery provided by this application mainly includes a housing, the housing includes a shell and a top cover device, and the shell and the top cover device enclose to form a containing cavity; the battery includes a battery cell assembly disposed in the containing cavity, the battery cell assembly includes a battery cell main body and a tab extending from one end of the battery cell main body, the top cover device includes a top cover body, a terminal assembly and an adapter assembly, the terminal assembly is disposed on the top cover body; the adapter assembly is electrically connected to the tab, the adapter assembly is fixedly connected to the terminal assembly, wherein, the terminal assembly includes a fixing structure, a connecting structure and a plastic structure, the fixing structure is electrically connected to the adapter assembly; the connecting structure is fixedly connected to the top cover body; the plastic structure is disposed between the fixing structure and the connecting structure, and a part of the connecting structure extending towards the fixing structure is embedded in the plastic structure, and a part of the fixing structure extending towards the connecting structure is embedded in the plastic structure.

[0042] In the prior art, the integrated pole terminal design of the terminal assembly leads to great difficulty in assembly and low efficiency, and occupies more space inside the shell, limiting the improvement of battery energy density. In addition, the fixed structure and the connecting structure may not provide sufficient mechanical strength and electrical connection stability, which may cause connection failure in dynamic application environments, affecting the performance and safety of the battery. In order to solve these problems, the battery of the present technical solution adopts a new terminal assembly design. The terminal assembly consists of a fixed structure, a connecting structure and a plastic structure. The fixed structure is electrically connected to the adapter assembly to ensure the directness and stability of the electrical connection. The connecting structure is fixedly connected to the top cover body to provide mechanical fixation and support. The plastic structure is arranged between the fixed structure and the connecting structure, and the connecting structure is partially embedded in the plastic structure extending toward the fixed structure, and the fixed structure is partially embedded in the plastic structure extending toward the connecting structure, which is equivalent to the connecting structure being embedded in the outer periphery of the plastic structure, and the fixed structure is wrapped in the inner periphery of the plastic structure. Such a structural design not only enhances the mechanical strength of the overall assembly, but also improves the stability of the electrical connection and the sealing performance of the assembly through the elasticity and insulation properties of the plastic structure.

[0043] This design makes the assembly process of the terminal assembly simpler and faster, improving production efficiency. The optimized terminal assembly structure is more compact, able to maintain stable electrical connection in various application environments, reducing the risk of connection failure, thereby improving the reliability and safety of the battery. In addition, the adapter assembly is electrically connected to the tab, saving the space occupied by the tab folding, making it possible to increase the battery energy density.

[0044] Combined with the above structure and process description, it can be seen that the battery has at least the following beneficial effects: the battery effectively improves the assembly efficiency of the battery top cover device and the stability of the electrical connection by optimizing the structural design of the terminal assembly, while reducing the occupancy of the internal space of the shell, providing a solution for improving the battery energy density and ensuring the reliability and safety of the battery in various application environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0046] Figure 1 A structural diagram of a battery provided in an embodiment of the present application;

[0047] Figure 2 A cross-sectional view of a top cover device provided in an embodiment of the present application;

[0048] Figure 3 Explosion diagram of the top cover device provided by the embodiment of the present application;

[0049] Figure 4 Cross-sectional view of the negative electrode assembly provided by the embodiment of the present application;

[0050] Figure 5 Cross-sectional view of the positive electrode assembly provided by the embodiment of the present application;

[0051] Figure 6 Explosion diagram of the negative electrode assembly provided by the embodiment of the present application;

[0052] Figure 7 Explosion diagram of the positive electrode assembly provided by the embodiment of the present application;

[0053] Figure 8 Structural diagram of the negative terminal provided by the embodiment of the present application;

[0054] Figure 9 Structural diagram of the positive terminal provided by the embodiment of the present application;

[0055] Figure 10 Cross-sectional view of the negative electrode assembly provided by the second embodiment of the present application;

[0056] Figure 11 Cross-sectional view of the negative electrode assembly provided by the third embodiment of the present application;

[0057] Figure 12 Structural diagram of the top cover provided by the embodiment of the present application;

[0058] Figure 13 Cross-sectional view of the negative electrode assembly provided by the fourth embodiment of the present application;

[0059] Figure 14 First size diagram of the battery provided by the embodiment of the present application;

[0060] Figure 15 Second size diagram of the battery provided by the embodiment of the present application;

[0061] Figure 16 Third size diagram of the battery provided by the embodiment of the present application;

[0062] Figure 17 Fourth size diagram of the battery provided by the embodiment of the present application.

[0063] Wherein:

[0064] Outer shell 100, housing 1, liquid injection hole 2, top cover device 3, explosion-proof valve 4,

[0065] Top cover body 31, mounting hole 311, flanging structure 312, groove structure 313, counterbore structure 314, metal flow 315,

[0066] Terminal assembly 32, fixing structure 321, first notch 3211, inner ring surface 3212, first counterbore 3213, C corner 3214, connecting structure 322, second notch 3221, plastic structure 323, first protrusion 3231, second protrusion 3232, third protrusion 3233, mounting structure 324, third notch 3241, step 3242, ring surface 3243, groove 3244, sealing structure 325,

[0067] Adapter assembly 33, adapter board 331, conductive structure 332,

[0068] Insulating component 34. Detailed implementation manners

[0069] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. 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 protection scope of the present application.

[0070] In order to enable those skilled in the art of this technology to better understand the solution of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0071] In the attached Figures 1 to 17 drawings, coordinate axes are marked, and the indicated directions of the coordinate axes are consistent with the description directions of the content of the present application. The coordinate axis x represents the second direction, and the second direction is also the length direction and the left - right direction. The coordinate axis y represents the third direction, and the third direction is also the width direction and the front - back direction. The coordinate axis z represents the first direction, and the first direction is also the height direction, the thickness direction, and the up - down direction. In addition, the radial direction referred to in the present application is the direction perpendicular to the first direction.

[0072] Please refer to Figure 1 , Figure 1 which is the structural diagram of the battery provided by the embodiment of the present application.

[0073] As Figure 1 shown, the battery mainly includes a housing 100. The housing 100 includes a housing body 1 and a top cover device 3. The housing body 1 and the top cover device 3 enclose a receiving cavity. The battery includes a battery cell assembly disposed in the receiving cavity. The battery cell assembly includes a battery cell main body and a tab extending from one end of the battery cell main body.

[0074] Optionally, the housing 100 is provided with a liquid injection hole 2 and an explosion-proof valve 4. The liquid injection hole 2 is used for injecting electrolyte during the battery manufacturing process. The explosion-proof valve 4 can provide protection when the internal pressure of the battery rises abnormally.

[0075] In some cases, both the liquid injection hole 2 and the explosion-proof valve 4 can be provided on the top cover device 3. In addition, the liquid injection hole 2 and the explosion-proof valve 4 can also be provided at other positions of the housing 100, such as the housing 1, which should also belong to the scope of the description of this application.

[0076] Please refer to Figure 2 , Figure 2 which is a cross-sectional view of the top cover device provided by the embodiment of this application.

[0077] As Figure 2 shown, the top cover device 3 includes a top cover main body 31, a terminal assembly 32 and an adapter assembly 33. The terminal assembly 32 is arranged on the top cover main body 31; the adapter assembly 33 is electrically connected to the tab, and the adapter assembly 33 is fixedly connected to the terminal assembly 32.

[0078] Please refer to Figure 3 , Figure 3 which is an exploded view of the top cover device provided by the embodiment of this application.

[0079] As Figure 3 shown, the terminal assembly 32 includes a fixing structure 321, a connecting structure 322 and a plastic structure 323. The fixing structure 321 is electrically connected to the adapter assembly 33; the connecting structure 322 is fixedly connected to the top cover main body 31; the plastic structure 323 is arranged between the fixing structure 321 and the connecting structure 322. A part of the connecting structure 322 extending towards the fixing structure 321 is partially embedded in the plastic structure 323, and a part of the fixing structure 321 extending towards the connecting structure 322 is partially embedded in the plastic structure 323. It is equivalent to that the connecting structure 322 is embedded in the outer periphery of the plastic structure 323, and the fixing structure 321 wraps around the inner periphery of the plastic structure 323.

[0080] In the prior art, the integrated pole terminal design of the terminal assembly 32 leads to great difficulty in assembly and low efficiency, and at the same time occupies more space inside the housing 1, limiting the improvement of the battery energy density. In addition, the fixed structure 321 and the connecting structure 322 may not provide sufficient mechanical strength and electrical connection stability, which may cause connection failure in dynamic application environments, affecting the performance and safety of the battery. In order to solve these problems, the battery of the present technical solution adopts a new terminal assembly 32 design. The terminal assembly 32 is composed of a fixed structure 321, a connecting structure 322 and a plastic structure 323. The fixed structure 321 is electrically connected to the adapter assembly 33, ensuring the directness and stability of the electrical connection. The connecting structure 322 is fixedly connected to the top cover body 31, providing mechanical fixation and support. The plastic structure 323 is arranged between the fixed structure 321 and the connecting structure 322. The connecting structure 322 is embedded in the outer periphery of the plastic structure 323, and the fixed structure 321 is wrapped in the inner periphery of the plastic structure 323. Such a structural design not only enhances the mechanical strength of the overall component, but also improves the stability of the electrical connection and the sealing performance of the component through the elasticity and insulation properties of the plastic structure 323.

[0081] Through this design, the assembly process of the terminal assembly 32 is simpler and faster, and the production efficiency is improved. The optimized terminal assembly 32 has a more compact structure and can maintain a stable electrical connection in various application environments, reducing the risk of connection failure, thereby improving the reliability and safety of the battery. In addition, the adapter assembly 33 is electrically connected to the tab, saving the space occupied by the tab folding, which makes it possible to improve the energy density of the battery.

[0082] Combined with the above structure and process description, it can be seen that the battery has at least the following beneficial effects: the battery effectively improves the assembly efficiency of the battery top cover device 3 and the stability of the electrical connection by optimizing the structural design of the terminal assembly 32, while reducing the internal space occupied by the shell 1, providing a solution for improving the battery energy density and ensuring the reliability and safety of the battery in various application environments.

[0083] In some cases, such as Figure 3 As shown, the top cover device 3 includes a top cover body 31 and two sets of terminal assemblies 32 arranged on the top cover body 31, and each set of terminal assemblies 32 is correspondingly installed with a set of adapter assemblies 33, corresponding to the first set of terminal assemblies 32 and their adapter assemblies 33 on the left side of the figure, and the second set of terminal assemblies 32 and their adapter assemblies 33 on the right side of the figure.

[0084] In some cases, the first set of terminal assemblies 32 and their adapter assemblies 33 can be regarded as the negative electrode assemblies, and the terminal assemblies 32 therein can be regarded as the negative terminals. The second set of terminal assemblies 32 and their adapter assemblies 33 can be regarded as the positive electrode assemblies, and the terminal assemblies 32 therein can be regarded as the positive terminals. The compositions of the negative terminals and the positive terminals can be the same or different.

[0085] In some embodiments, the adapter assembly 33 includes:

[0086] An adapter board 331 electrically connected to the tab.

[0087] A conductive structure 332 disposed on the adapter board 331, and the conductive structure 332 is electrically connected to the terminal assembly 32.

[0088] In this embodiment, the adapter board 331 is electrically connected to the tab, saving the space occupied by the folding of the tab. Aiming at the problems of the traditional top cover structure adopting the butterfly welding method of the tab, large loss of space in the bent area of the tab, and reduced utilization rate of the internal space of the housing 1, after the adapter board 331 and the conductive structure 332 are welded in this embodiment, a new core combining process is adopted with the core (electric core) to reduce the folding height of the tab, weld the tab to the adapter board 331, increase the space of the electric core, and increase the energy density.

[0089] In the prior art, when the electric core is electrically connected to the adapter board 331, the electric core is in a horizontal state, and after the tab of the electric core is electrically connected to the adapter board 331, the electric core is adjusted to a vertical state, causing multiple bending and folding of the tab of the electric core. Therefore, the tab of the electric core occupies space, which is not conducive to improving the energy density of the battery. Compared with this, in the present application, with the top cover 1 of the present application, the tabs are arranged flatly, and the flat part is arranged in the reserved space. The reserved space saves internal space compared with the traditional tab folding method. In the present application, the tab of the electric core can be directly connected and fixed to the adapter board 331, and then the assembly of the adapter assembly 33 and the terminal assembly 32 is carried out, simplifying the assembly process, reducing the occupation of the internal space of the housing 1 by the tabs, and improving the energy density of the battery.

[0090] Optionally, after the adapter board 331 and the conductive structure 332 are assembled into one body, the adapter board 331 is welded and fixed to the tab of the electric core, and then the conductive structure 332 is welded and fixed to the fixing structure 321, thus realizing welding after core combination and reducing the process difficulty.

[0091] In some embodiments, the top cover body 31 is provided with an installation hole 311, and the conductive structure 332 is arranged in the installation hole 311; the adapter board 331 is arranged on one side of the top cover body 31 along the first direction; the terminal assembly 32 is arranged on the other side of the top cover body 31 along the first direction and is connected to the adapter assembly 33.

[0092] Such as Figure 2As shown, the coordinate axis z in the figure represents the first direction. The adapter board 331 is disposed on one side of the top cover body 31 along the first direction, corresponding to the lower side in the figure, and the terminal assembly 32 is disposed on the other side of the top cover body 31 along the first direction, corresponding to the upper side in the figure. Among them, the structural shapes of the mounting hole 311 and the conductive structure 332 can be any shape such as circular, square, oval, etc., which should also belong to the scope of description of this application.

[0093] In this embodiment, due to the separation of the terminal assembly 32 and the adapter assembly 33, the conductive structure 332 can be designed to pass through the mounting hole 311 on the top cover body 31 and be electrically connected to the terminal assembly 32. Through the split design of the terminal assembly 32 and the adapter assembly 33 in the top cover device 3, the assembly difficulty of the components in the top cover device 3 is reduced. At the same time, it is convenient for the tab of the battery cell to be electrically connected to the adapter board 331, reducing the space occupied by the tab and improving the energy density.

[0094] In addition, the conductive structure 332 is a cylinder and can be formed by stacking at least one cylinder with a different diameter. The conductive structure 332 penetrates the entire top cover body 31 along the first direction, and the top end is fixedly welded to the mounting structure 324, and the bottom end is fixedly welded to the battery cell.

[0095] As Figure 3 shown, the coordinate axis z in the figure represents the first direction. The conductive structure 332 penetrates the entire top cover body 31 along the first direction, corresponding to the up and down direction in the figure. In some embodiments, the top cover body 31 is provided with a flanging structure 312. The mounting hole 311 is located inside the flanging structure 312. The terminal assembly 32 is disposed inside the flanging structure 312, and the flanging structure 312 is fixedly connected to the connection structure 322.

[0096] In this embodiment, the flanging structure 312 presents a ring-shaped convex structure, which facilitates the welding connection between the terminal assembly 32 and the top cover body 31 and enhances the structural strength.

[0097] In some embodiments, the top cover body 31 is further provided with a groove structure 313, and the groove structure 313 is disposed around the outer periphery of the flanging structure 312.

[0098] In this embodiment, by providing the groove structure 313 outside the flanging structure 312 on the upper surface of the top cover body 31, it is possible to prevent the generation of metal wires between the root of the flanging structure 312 and the surface of the top cover body 31, which is beneficial to reducing the process difficulty and improving the product appearance.

[0099] In some embodiments, a counterbore structure 314 is provided inside the flanging structure 312, and the connection structure 322 is disposed on the counterbore structure 314, and the connection structure 322 is fixedly connected to the flanging structure 312.

[0100] In this embodiment, by forming a sink structure 314 inside the flange structure 312, such a structural design provides a stable support for the terminal assembly 32. The presence of the sink structure 314 enhances the connection strength between the terminal assembly 32 and the top cover body 31. At the same time, the fixed connection between the connection structure 322 and the flange structure 312 ensures the stable positioning of the terminal assembly 32. Through precise positioning and stable support, it helps to improve the overall performance and durability of the battery. In addition, this structure also facilitates the installation and welding process of the terminal assembly 32, further improving the production efficiency and consistency of the battery.

[0101] In some embodiments, the interior of the fixed structure 321 is hollow, a conductive structure 332 is disposed inside the fixed structure 321 , and the conductive structure 332 is electrically connected to the fixed structure 321 .

[0102] It should be noted that the terminal assembly 32 adopts a hollow structure design. On the one hand, the advantage of the hollow design is that it reduces product weight, reduces costs, and improves energy density; on the other hand, the terminal assembly 32 is used for the conductive structure 332 in the adapter assembly 33 to penetrate and be fixedly connected.

[0103] In some embodiments, the terminal assembly 32 further includes a sealing structure 325 , which is disposed in the mounting hole 311 , and the sealing structure 325 is in contact and sealed with the fixing structure 321 , and a gap is left between the sealing structure 325 and the conductive structure 332 .

[0104] In this embodiment, the sealing structure 325 plays a sealing role between the terminal assembly 32 and the top cover body 31. A gap is left between the sealing structure 325 and the conductive structure 332, ensuring that the fit between the terminal assembly 32 and the top cover body 31 is both stable and allows appropriate thermal expansion, thereby ensuring the reliability of the long-term operation of the battery.

[0105] In some embodiments, the top cover device 3 further includes an insulating component 34 , the insulating component 34 is located between the top cover body 31 and the adapter plate 331 , and the conductive structure 332 penetrates the insulating component 34 along the first direction.

[0106] like Figure 3 As shown, the coordinate axis z in the figure represents a first direction, and the conductive structure 332 penetrates the insulating component 34 along the first direction, corresponding to the up and down direction in the figure.

[0107] In this embodiment, the insulating component 34 plays the role of insulation and fixing, ensuring the stability of the internal structure of the battery and isolating the top cover body 31 from the battery cell. Such a design not only improves the safety of the battery, but also helps to prevent short circuits or other potential electrical problems during the use of the battery.

[0108] As an option, the insulating component 34 can be a plastic material that is heated and melted and then hot-melt-molded on the bottom surface of the top cover body 31 .

[0109] In some embodiments, the terminal assembly 32 further includes a mounting structure 324 , which is located inside the fixing structure 321 and has an interference fit with the fixing structure 321 .

[0110] Please refer to Figure 4 , Figure 4 A cross-sectional view of a negative electrode assembly provided in an embodiment of the present application.

[0111] In some cases, the negative electrode assembly includes a terminal assembly 32 and a transfer assembly 33 , the terminal assembly 32 serves as a negative terminal, and the negative terminal includes a fixing structure 321 , a connecting structure 322 , a plastic structure 323 and a mounting structure 324 .

[0112] In this embodiment, the mounting structure 324 is located at the periphery of the conductive structure 332 and is fixedly connected to the conductive structure 332; the fixed structure 321 is located at the periphery of the mounting structure 324 and is interference fit with the mounting structure 324; the connecting structure 322 is located at the periphery of the fixed structure 321 and is fixedly connected to the fixed structure 321, and the connecting structure 322 is also fixedly connected to the top cover body 31.

[0113] This technical solution aims to solve the problem of high cost of the pole part in the top cover structure of the power battery, and proposes an optimized top cover device 3 design. The conductive structure 332 of the traditional power battery is usually made of copper and aluminum materials, which are manufactured by friction welding or using copper and aluminum composite plates. Such materials and manufacturing processes are relatively expensive. In particular, in order to adapt to a larger current load, the welding area between the pole end face and the busbar (busbar) needs to be increased, which further increases the cost. This solution effectively reduces the material and manufacturing costs of the pole end by using the interference fit assembly of the fixed structure 321 and the mounting structure 324. The interference fit between the fixed structure 321 and the mounting structure 324 not only reduces the use of copper material, but also the fixed structure 321 can provide a sufficiently large busbar welding area without significantly increasing the material cost. In addition, this interference fit assembly simplifies the welding process and reduces assembly costs.

[0114] Combined with the above structure and process description, it can be seen that the top cover device 3 has at least the following beneficial effects: the top cover device 3 adopts interference fit assembly of the fixing structure 321 and the mounting structure 324, which effectively reduces the material and manufacturing cost of the pole part, while reducing the welding assembly cost and improving the assembly efficiency of the battery.

[0115] Please refer to Figure 5 , Figure 5 A cross-sectional view of a positive electrode assembly provided in an embodiment of the present application.

[0116] In some cases, the positive electrode assembly includes a terminal assembly 32 and a transfer assembly 33, the terminal assembly 32 serves as a positive terminal, and a solution is adopted in which the positive terminal includes a fixing structure 321, a connecting structure 322 and a plastic structure.

[0117] In this embodiment, the fixed structure 321 is located at the periphery of the conductive structure 332 and is fixedly connected to the conductive structure 332; the connecting structure 322 is located at the periphery of the fixed structure 321 and is fixedly connected to the fixed structure 321, and the connecting structure 322 is also fixedly connected to the top cover body 31. Optionally, the fixed structure 321 and the conductive structure 332 are fixed by welding, and the connecting structure 322 is fixed by welding to the top cover body 31. The plastic structure 323 is disposed between the fixed structure 321 and the connecting structure 322, and the fixed structure 321 is wrapped around the inner side of the plastic structure 323, and the connecting structure 322 is embedded in the outer side of the plastic structure 323.

[0118] The fixed structure 321, the connecting structure 322 and the plastic structure 323 in this embodiment constitute the positive terminal. The plastic structure 323 in the positive terminal wraps the fixed structure 321 and the connecting structure 322 for integral injection molding, thereby realizing integral injection molding of the positive terminal and simplifying the assembly process. The positive terminal is modularly designed to simplify the production process, improve production efficiency and reduce costs.

[0119] Please refer to Figure 6 and Figure 7 , Figure 6 An exploded view of the negative electrode assembly provided in an embodiment of the present application, Figure 7 An exploded view of the positive electrode assembly provided in an embodiment of the present application.

[0120] like Figure 6 and Figure 7 As shown, for the negative terminal, the outer periphery of the fixing structure 321 is provided with a first notch 3211, the inner periphery of the connecting structure 322 is provided with a second notch 3221, the outer periphery of the mounting structure 324 is provided with a third notch 3241, the outer periphery of the plastic structure 323 is provided with a third protrusion 3233 corresponding to the second notch 3221, the inner periphery of the plastic structure 323 is provided with a second protrusion 3232 corresponding to the first notch 3211 and a first protrusion 3231 corresponding to the third notch 3241, and the matching relationship between the notch and the protrusion plays a role in preventing twisting.

[0121] For the positive terminal, a first notch 3211 is provided on the outer periphery of the fixing structure 321, a second notch 3221 is provided on the inner periphery of the connecting structure 322, a third protrusion 3233 corresponding to the second notch 3221 is provided on the outer periphery of the plastic structure 323, and a second protrusion 3232 corresponding to the first notch 3211 is provided on the inner periphery of the plastic structure 323, and a torque-stopping effect is achieved through the matching relationship between the notch and the protrusion.

[0122] Please refer to Figures 14 to 17 , Figure 14 which is the first dimension diagram of the battery provided by the embodiment of the present application, Figure 15 which is the second dimension diagram of the battery provided by the embodiment of the present application, Figure 16 which is the third dimension diagram of the battery provided by the embodiment of the present application, Figure 17 which is the fourth dimension diagram of the battery provided by the embodiment of the present application.

[0123] Optionally, as shown in Figure 17 , the ratio of the distance H5 from the flanging structure 312 to the surface of the top cover body 31 away from the side of the battery cell assembly to the dimension H6 in the first direction of the conductive structure 332, i.e., the height, is 0.05 - 0.5.

[0124] The flanging structure 312 is located on the outer periphery of the mounting hole 311 of the top cover body 31. The flanging structure 312 is welded and fixed to the corresponding terminal assembly 32. The height of the flanging structure 312 determines the height of the terminal assembly 32. Therefore, the ratio of 0.05 - 0.5 can meet the requirements of structural strength, cost reduction and weight reduction; preferably, when the ratio is 0.1 - 0.25, it has better effects.

[0125] In addition, the welding surface width H4 between the flanging structure 312 and the connecting structure 322 satisfies 0.3 - 4 mm, preferably 0.5 - 1.5 mm, to ensure the uniformity of welding and the stability of the structure.

[0126] In some embodiments, the materials of the mounting structure 324 and the fixing structure 321 are different.

[0127] Optionally, the material of the mounting structure 324 is copper, and the material of the fixing structure 321 is aluminum. The high electrical conductivity and heat conduction performance of copper help to improve the charge and discharge efficiency and heat dissipation capacity of the battery. The light weight and corrosion resistance of aluminum help to reduce the weight of the battery and improve durability. In addition, the cost of aluminum is lower than that of copper, which helps to reduce the overall production cost.

[0128] In some embodiments, as shown in Figure 17 , in the first direction, the difference between the dimension H6, i.e., the height, of the conductive structure 332 and the dimension H9 of the structure formed by the fixing structure 321, the plastic structure 323, the top cover body 31, the insulating component 34, and the adapter plate 331 is 0.1 - 2 mm, preferably 0.2 - 0.5 mm, to ensure structural strength and improve the production yield of the product.

[0129] In addition, the misalignment range between the mounting structure 324 and the conductive structure 332 in the first direction is ≤ 0.2 mm, which ensures the welding yield of the conductive structure 332 of the negative electrode assembly and the mounting structure 324, and avoids risks such as explosion points and false soldering. The misalignment range between the fixing structure 321 and the conductive structure 332 in the first direction is ≤ 0.2 mm, which ensures the welding yield of the conductive structure 332 of the positive electrode assembly and the fixing structure 321, and avoids risks such as explosion points and false soldering.

[0130] In some embodiments, the outer periphery of the fixing structure 321 is provided with a stepped surface flush with the surface of the plastic structure 323 away from the top cover body 31. As Figure 14 shown, the distance H2, that is, the height difference, between the surface of the fixing structure 321 away from the top cover body 31 and the surface of the plastic structure 323 away from the top cover body 31 is not less than 0.3 mm. The stepped surface helps with the forming and positioning of the plastic structure 323. The height difference between the fixing structure 321 and the plastic structure 323 can avoid glue overflow during the injection molding process and facilitate busbar welding. Preferably, the height difference is in the range of 0.3 - 1 mm.

[0131] As an option, as Figure 17 shown, the surface of the fixing structure 321 away from the top cover body 31 is farther from the top cover body 31 than the surface of the mounting structure 324 away from the top cover body 31, and the distance H8, that is, the height difference, between the two surfaces in the first direction is not less than 0.2 mm. The height difference can reserve space for the welding surplus height of the conductive structure 332 and the mounting structure 324, and facilitate the subsequent busbar welding surface to remain flush.

[0132] As an option, as Figure 14 shown, the plastic structure 323 covers the first surface, that is, the top surface, of the connecting structure 322 away from the top cover body 31. In the radial direction perpendicular to the first direction, the radial distance W1 between the plastic structure 323 on the first surface and the outer edge of the first surface is not less than 0.2 mm. The distance can prevent the plastic structure 323 from being thermally deformed due to the welding of the connecting structure 322 and the flanging structure 312. Preferably, the distance is in the range of 0.5 - 1.5 mm.

[0133] As Figure 14 shown, the plastic structure 323 covers the second surface, that is, the bottom surface, of the connecting structure 322 facing the top cover body 31. In the radial direction perpendicular to the first direction, the radial distance W2 between the plastic structure 323 on the second surface and the outer edge of the second surface is not less than 0.05 mm and not more than 0.3 mm. The distance can prevent the plastic structure 323 from being thermally deformed due to the welding of the connecting structure 322 and the flanging structure 312.

[0134] As an option, as Figure 15As shown, the ratio of the projected area S2 of the adapter board 331 in the first direction to the projected area S1 of the fixed structure 321 in the first direction is not less than 0.03 and not greater than 0.5. As Figure 16 and Figure 17 shown, the ratio of the area S9 of the adapter board 331 to the area S8 of the surface of the fixed structure 321 on the side away from the top cover body 31 satisfies 0.03 to 0.5. Preferably, the area ratio is between 0.05 and 0.2. By designing the ratio of the areas, the current-carrying area is ensured.

[0135] In addition, as Figure 16 shown, the ratio of the minimum cross-sectional area S7 of the adapter board 331 in the second direction to the contact area S6 between the fixed structure 321 and the conductive structure 332 satisfies 0.2 to 5, preferably 0.5 to 2, which can meet the current-carrying capacity.

[0136] As an option, the conductive structure 332 is disposed through the adapter board 331. As Figure 15 shown, the ratio of the contact area S5 between the mounting hole 311 and the conductive structure 332 to the cross-sectional area S3 of the conductive structure 332 at the contact surface is not less than 0.1. By designing the ratio of the areas, the current-carrying capacity matching between the conductive structure 332 and the adapter board 331 is ensured, and the preferred range is 0.15 to 0.3.

[0137] In some embodiments, the mounting structure 324 is provided with at least one step 3242, and the fixed structure 321 is provided with a first counterbore 3213 corresponding to the step 3242.

[0138] Please refer to Figure 8 , Figure 8 which is the structural diagram of the negative terminal provided by the embodiment of the present application.

[0139] As Figure 8 shown, the number of the steps 3242 is one, and the number of the first counterbores 3213 is one. These steps 3242 and the first counterbores 3213 of the fixed structure 321 play an assembly limiting role. In the mounting structure 324, at least one annular surface 3243 is in interference fit with the corresponding inner annular surface 3212 of the fixed structure 321. The combination of the fixed structure 321 and the mounting structure 324 and the connecting structure 322 are integrally injection-molded with plastic to form a negative terminal together with the plastic structure 323.

[0140] As an option, as Figure 14As shown, the dimension H1 of the first sunk platform 3213 in the first direction is not less than 0.3 mm, preferably 0.3 - 2 mm, to avoid burrs or flash during the manufacturing process of the fixing structure 321 at the first sunk platform 3213. A C chamfer 3214 is provided at the root of the first sunk platform 3213. When the radial dimension of the C chamfer 3214 in the fixing structure 321 is not greater than 3 mm, the accuracy of assembly and the stability of the components are ensured.

[0141] Please refer to Figure 9 , Figure 9 which is the structural diagram of the positive terminal provided by the embodiment of the present application.

[0142] As Figure 9 shown, the fixing structure 321 and the connecting structure 322 are injection molded with plastic together to form the positive terminal together with the plastic structure 323.

[0143] Optionally, as Figure 14 shown, the minimum cross-sectional thickness H10 of the plastic structure 323 is not less than 0.3 mm and not greater than 3 mm.

[0144] Please refer to Figure 10 , Figure 10 which is the cross-sectional view of the negative electrode assembly provided by the second embodiment of the present application.

[0145] As Figure 10 shown, the number of steps 3242 is two, and the number of the first sunk platforms 3213 is two. The fixing structure 321 is assembled on the mounting structure 324 through two levels of steps 3242. After interference fitting, the fixing structure 321 is press riveted to the mounting structure 324 to the steps 3242 to form the corresponding number of first sunk platforms 3213.

[0146] In some embodiments, a groove 3244 is provided on the side surface of the step 3242, and the fixing structure 321 is disposed in the groove 3244.

[0147] Please refer to Figure 11 , Figure 11 which is the cross-sectional view of the negative electrode assembly provided by the third embodiment of the present application.

[0148] As Figure 11 shown, taking the example that the fixing structure 321 is assembled on the mounting structure 324 through two levels of steps 3242, a groove 3244 is provided on the side surface of the second-level step 3242, and the fixing structure 321 is in concave-convex fit with the groove 3244. During assembly, a step structure can be first provided on the side of the fixing structure 321 away from the top cover body 31, and the groove 3244 is formed on the mounting structure 324 through the way of spin riveting assembly of the mounting structure 324 and the fixing structure 321. This structural design allows a firm connection between the fixing structure 321 and the mounting structure 324 and ensures the stability and structural strength of the overall assembly.

[0149] Please refer to Figure 12 , Figure 12 , which is the structural diagram of the top cover provided by the embodiment of the present application.

[0150] As Figure 12 shown, the radially inner surface of the flanging structure 312 is designed as a non-equal-diameter toroidal surface. As Figure 17 shown, in the radial direction perpendicular to the first direction, the radial thickness W3 of the side of the flanging structure 312 away from the top cover body 31 is less than the radial thickness W4 of the root of the flanging structure 312. In the first direction, the distance H3 between the surface of the side of the flanging structure 312 away from the top cover body 31 and the surface of the side of the connecting structure 322 away from the top cover body 31 is not greater than 0.5 mm.

[0151] In some cases, in order to achieve the required height of the flanging structure 312 and the diameter of the mounting hole 311 on the top cover body 31, a unique stamping process is adopted. This process makes the metal flow 315 at the root of the flanging structure 312 present a "human" shape. This design and manufacturing method helps to improve the structural strength and forming accuracy of the top cover device 1.

[0152] A groove structure 313 is provided on the radially outer side of the flanging structure 312. As Figure 17 shown, the depth H7 of the groove structure 313 is not greater than 0.5 mm. It can prevent the generation of metal wires between the root of the flanging structure 312 and the surface of the top cover body 31, which is beneficial to reducing the process difficulty and improving the product appearance.

[0153] Please continue to refer to Figure 10 and Figure 11 . Before the top cover body 31 and the terminal assembly 32 are assembled, an "L"-shaped sealing structure 325 is placed in the mounting hole 311 on the top cover body 31. The sealing structure 325 is pressed by the terminal assembly 32, and then the connecting structure 322 and the inner circumference of the flanging structure 312 are welded and fixed to form the top cover device 1.

[0154] The projection of the "L"-shaped sealing structure 325 in the negative electrode assembly on the terminal assembly 32 in the first direction should cover the plastic structure 323 and the joint between the plastic structure 323 and the mounting structure 324. The projection of the "L"-shaped sealing structure 325 in the positive electrode assembly on the terminal assembly 32 in the first direction should cover the plastic structure 323 and the joint between the plastic structure 323 and the fixing structure 321. At the same time, the minimum distance from the inner diameter of the sealing structure 325 to the joint should be not less than 0.1 mm, and the preferred range is 0.3 mm to 1 mm, so as to ensure the sealing performance and prevent the performance reduction or damage of the sealing structure 325 caused by the thermal influence during the welding process.

[0155] Please refer to Figure 13 ,Figure 13 A cross-sectional view of the negative electrode assembly provided by the fourth embodiment of the present application.

[0156] As Figure 13 shown, steps are provided on the surfaces of the conductive structure 332 and the mounting structure 324 that are flush with the side facing the top cover body 31. These steps serve as limits for the assembly of the conductive structure 332. Steps are also provided on the surface of the mounting hole 311 of the conductive structure 332 and the top cover body 31 that is flush with the side facing the terminal assembly 32. The matching sealing structure 325 is provided in a T shape, and the inner ring of the sealing structure 325 is placed between the step of the conductive structure 332 and the lower surface of the mounting structure 324, serving as a secondary seal for the welding of the mounting structure 324 and the conductive structure 332, thereby enhancing the sealing performance of the negative terminal.

[0157] In addition, the adapter plate 331 and the conductive structure 332 are connected by lap welding. To ensure the matching of the overcurrent capacity, the ratio of the inner wall area of the mounting hole 311 of the adapter plate 331 to the cross-sectional area at the contact between the conductive structure 332 and the adapter plate 331 should be not less than 0.1, and the preferred range is 0.15 to 0.3. At the same time, the ratio of the projected area of the adapter plate 331 and the fixing structure 321 in the first direction of the conductive structure 332 on the top cover body 31 is not less than 0.03 and not greater than 0.5, and the preferred range is 0.15 to 0.3. In addition, the ratio of the minimum cross-sectional area of the adapter plate 331 in the length direction of the top cover body 31 to the area of the surface in close contact with the fixing structure 321 should satisfy 0.2 to 5, and the preferred range is 0.5 to 2. Meeting at least one of the above conditions can ensure the overcurrent capacity of the battery.

[0158] The present application also provides an electrical device, including the above battery. The design of this electrical device can be for energy storage applications or power output, or it can be compatible with both application modes, which should also fall within the scope of the description of the present application.

[0159] In addition, this electrical device should have all the beneficial effects of the above battery, which will not be elaborated here one by one.

[0160] It should be noted that many components mentioned in the present application are common standard components or components known to those skilled in the art. Their structures and principles can be known by those skilled in the art through technical manuals or by conventional experimental methods.

[0161] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0162] The above has introduced in detail the battery and the electrical device provided by this application. Specific examples are used in this text to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application. It should be noted that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and modifications can still be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A battery, characterized in that: The battery comprises a housing, wherein the housing comprises a shell and a top cover device, wherein the shell and the top cover device are combined to form a receiving cavity; the battery comprises a cell assembly arranged in the receiving cavity, wherein the cell assembly comprises a cell body and a tab extending from one end of the cell body, and the top cover device comprises: Top cover body; A terminal assembly is arranged on the top cover body; A transfer assembly is electrically connected to the tab, and the transfer assembly is fixedly connected to the terminal assembly, wherein the terminal assembly includes: A fixed structure electrically connected to the adapter assembly; A connecting structure, fixedly connected to the top cover body; The plastic structure is arranged between the fixing structure and the connecting structure. The part of the connecting structure extending toward the fixing structure is embedded in the plastic structure, and the part of the fixing structure extending toward the connecting structure is embedded in the plastic structure.

2. The battery according to claim 1, characterized in that The switching assembly comprises: An adapter plate, electrically connected to the tab; A conductive structure is provided on the adapter plate, and the conductive structure is electrically connected to the terminal assembly.

3. The battery according to claim 2, characterized in that The top cover body is provided with a mounting hole, in which the conductive structure is arranged; the adapter plate is arranged on one side of the top cover body along the first direction; the terminal assembly is arranged on the other side of the top cover body along the first direction and is connected to the adapter assembly.

4. The battery according to claim 3, characterized in that The top cover body is provided with a flange structure, the mounting hole is located inside the flange structure, the terminal assembly is arranged inside the flange structure, and the flange structure is fixedly connected to the connection structure.

5. The battery according to claim 4, characterized in that The top cover body is also provided with a groove structure, and the groove structure is arranged around the outer periphery of the flange structure.

6. The battery according to claim 4, characterized in that A sinking structure is provided inside the flanging structure, the connecting structure is provided on the sinking structure, and the connecting structure is fixedly connected to the flanging structure.

7. The battery according to claim 3, characterized in that The interior of the fixed structure is hollow, the conductive structure is disposed inside the fixed structure, and the conductive structure is electrically connected to the fixed structure.

8. The battery according to claim 1, characterized in that The terminal assembly further comprises a mounting structure, wherein the mounting structure is located inside the fixing structure and the mounting structure is interference-fitted with the fixing structure.

9. The battery according to claim 3, characterized in that The terminal assembly further comprises a sealing structure, which is arranged in the mounting hole, the sealing structure is in contact and sealed with the fixing structure, and a gap is left between the sealing structure and the conductive structure.

10. The battery according to claim 3, characterized in that The top cover device further includes an insulating component, the insulating component is located between the top cover body and the adapter plate, and the conductive structure penetrates the insulating component along a first direction.

11. The battery according to claim 8, characterized in that The mounting structure is provided with at least one step, and the fixing structure is provided with a first sink corresponding to the step, and a dimension of the first sink in the first direction is not less than 0.3 mm.

12. The battery according to claim 11, characterized in that A groove is provided on the side surface of the step, and the fixing structure is arranged in the groove.

13. The battery according to claim 1, characterized in that The outer periphery of the fixing structure is provided with a step surface flush with the surface of the plastic structure away from the top cover body, and in the first direction, the surface of the fixing structure away from the top cover body is not less than 0.3 mm away from the top cover body compared to the surface of the plastic structure away from the top cover body; and / or, The plastic structure covers a first surface of the connecting structure on a side away from the top cover body, and in a radial direction perpendicular to the first direction, a radial distance between the plastic structure on the first surface and an outer edge of the first surface is not less than 0.2 mm; and / or, The plastic structure covers a second surface of the connecting structure facing the top cover body, and in a radial direction perpendicular to the first direction, a radial spacing between the plastic structure on the second surface and an outer edge of the second surface is not less than 0.05 mm and not more than 0.3 mm.

14. The battery according to claim 3, characterized in that The ratio of the projection area of ​​the adapter plate in the first direction to the projection area of ​​the fixing structure in the first direction is not less than 0.03 and not more than 0.5; and / or, The ratio of the contact area between the mounting hole and the conductive structure to the cross-sectional area of ​​the conductive structure at the contact surface is not less than 0.1; and / or, The ratio of the minimum cross-sectional area of ​​the adapter plate in the first direction to the contact area between the fixing structure and the conductive structure satisfies 0.2 to 5; and / or, The ratio of the area of ​​the adapter plate to the area of ​​the surface of the fixing structure away from the top cover body is 0.03 to 0.

5.

15. The battery according to claim 4, characterized in that In the first direction, the ratio of the distance from the flange structure to the surface of the top cover body away from the battery core assembly to the size of the conductive structure in the first direction is 0.05 to 0.5; and / or, The welding surface width between the flange structure and the connection structure meets the requirement of 0.3 to 4 mm; and / or, In the radial direction perpendicular to the first direction, the radial thickness of the flange structure on the side away from the top cover body is less than the radial thickness of the root of the flange structure, and in the first direction, the distance between the surface of the flange structure on the side away from the top cover body and the surface of the connecting structure on the side away from the top cover body is not greater than 0.5 mm; and / or, A groove structure is provided on the outer side of the flange structure, and the depth of the groove structure is not greater than 0.5 mm.

16. The battery according to claim 8, characterized in that The mounting structure and the fixing structure are made of different materials; and / or, The surface of the fixing structure away from the top cover body is farther away from the top cover body than the surface of the mounting structure away from the top cover body, and the distance between the two surfaces in the first direction is not less than 0.2 mm.

17. The battery according to claim 10, characterized in that In the first direction, the difference between the size of the conductive structure and the size of the structure formed by the fixing structure, the plastic structure, the top cover body, the insulating component and the adapter plate is 0.1-2 mm.

18. An electrical device, characterized in that: Comprising a battery as described in any one of claims 1-17.

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