End cover assembly, battery monomer, battery device and power utilization device

Abstract

The utility model discloses an end cover assembly, a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly, a shell and an end cover assembly, the shell is provided with an opening, and the electrode assembly is arranged in the shell; the end cover assembly is arranged at the opening of the shell, the end cover assembly comprises an end cover and an electrode terminal, the end cover is provided with an electrode leading-out hole, the electrode terminal comprises a connecting part and a terminal body, the terminal body protrudes out of the connecting part and is at least partially contained in the electrode leading-out hole, and the terminal body is arranged in the electrode leading-out hole in the axial direction of the electrode leading-out hole and in the direction pointing to the electrode assembly. And the cross sectional area of the electrode lead-out hole is gradually increased. The reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] In recent years, with the rapid development of new energy technologies, new energy vehicles have become increasingly popular, gradually replacing traditional fuel vehicles and becoming one of the mainstream modes of transportation. As the power source of new energy vehicles, power batteries are one of their core components, making their safety performance a key concern.

[0003] In the development of battery technology, how to improve the reliability of battery cells is a research direction in battery technology. Utility Model Content

[0004] The embodiments of the present application provide an end cap assembly, a battery cell, a battery device, and an electrical device, which can improve the reliability of the battery cell.

[0005] In the first aspect, an embodiment of the present application provides a battery cell, which includes an electrode assembly, a shell and an end cover assembly, the shell having an opening, and the electrode assembly is arranged inside the shell; the end cover assembly is arranged at the opening of the shell, the end cover assembly includes an end cover and an electrode terminal, the end cover has an electrode lead-out hole, the electrode terminal includes a connecting portion and a terminal body, the terminal body protrudes from the connecting portion and is at least partially accommodated in the electrode lead-out hole, and the cross-sectional area of ​​the electrode lead-out hole gradually increases along the axial direction of the electrode lead-out hole and in the direction pointing to the electrode assembly.

[0006] In the above scheme, by setting the electrode lead-out hole to a shape with a gradually increasing cross-sectional area along the axial direction and pointing to the electrode assembly, when the electrode terminal is installed from the end cover toward one side of the electrode assembly, the inner wall of the electrode lead-out hole will not interfere with the terminal body, thereby facilitating the assembly between the end cover and the electrode terminal. In addition, the metal chips generated by interference friction can be reduced during the assembly process, reducing the risk of metal chips falling into the electrode assembly and causing a short circuit, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the terminal body includes a top and a side, the side is arranged around the circumference of the top, the side of the side away from the top is connected to the connecting part, the side is inclined relative to the axial direction, and the side is connected to the end cover.

[0008] In the above solution, the top and the side form a regular trapezoidal shape, which not only reduces the interference of the end cover on the electrode terminal when the electrode terminal and the end cover are assembled, but also facilitates the fitting connection between the side and the inner wall of the electrode lead-out hole.

[0009] In some embodiments, the thickness of the side portions is greater than the thickness of the top portion.

[0010] In the above solution, by increasing the thickness of the side portion, it is possible to prevent the side portion of the electrode terminal from being compressed and deformed when the electrode terminal and the end cover are assembled to a certain extent.

[0011] In some embodiments, the thickness of the side portion is greater than the thickness of the connecting portion.

[0012] In the above solution, the side portion is subjected to greater pressure relative to the connecting portion. Therefore, by setting the thickness of the side portion to be thicker than the thickness of the connecting portion, the strength of the side portion can be improved, thereby improving the strength of the entire end cover assembly.

[0013] In some embodiments, the thickness of the side portion is D1, the thickness of the connecting portion is D2, and D1 and D2 satisfy: 1.2≤D1 / D2≤1.4.

[0014] In the above solution, the thickness ratio of the side portion to the connecting portion is within a moderate range, which can ensure the strength of the end cover assembly to a certain extent and save materials.

[0015] In some embodiments, D1 and D2 satisfy: 1.25≤D1 / D2≤1.35.

[0016] In the above solution, by further limiting the range of the thickness ratio of the side portion to the connecting portion, the strength of the end cover assembly is further improved, and materials are further saved.

[0017] In some embodiments, the angle between the side portion and the connecting portion is α1, and α1 satisfies: 100°≤α1≤150°.

[0018] In the above solution, the angle between the side portion and the connecting portion is moderate, which can take into account both structural strength and manufacturability.

[0019] In some embodiments, α1 satisfies: 115°≤α1≤125°.

[0020] In the above solution, by further limiting the angle between the side portion and the connecting portion, the structural strength of the end cover assembly can be further improved and the preparation is facilitated.

[0021] In some embodiments, the interior of the terminal body is hollow.

[0022] In the above solution, by setting the interior of the terminal body to be hollow, it is possible to save material and reduce weight.

[0023] In some embodiments, the electrode assembly includes an electrode body and a tab, wherein the tab is disposed at one end of the electrode body and connected to the connecting portion.

[0024] In the above scheme, by directly connecting the tab with the connecting portion, no adapter component is needed, the internal space of the battery monomer can be saved, and the energy density of the battery monomer is improved.

[0025] In a second aspect, the embodiments of the present application further provide an end cover assembly, comprising an end cover and an electrode terminal, the end cover has an electrode lead-out hole; the electrode terminal comprises a connecting portion and a terminal body, the terminal body protrudes from the connecting portion and is at least partially accommodated in the electrode lead-out hole, in the axial direction of the electrode lead-out hole and in the direction pointing to the electrode assembly, the cross-sectional area of the electrode lead-out hole gradually increases.

[0026] In a third aspect, the embodiments of the present application further provide a battery device, comprising the battery monomer of any of the above embodiments.

[0027] In a fourth aspect, the embodiments of the present application further provide a power utilization device, comprising the battery device of any of the above embodiments, the battery device is used to provide electric energy.

[0028] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will be the specific embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application, obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 is a structural schematic diagram of a vehicle of some embodiments of the present application;

[0031] Figure 2 is an exploded view of a battery device of some embodiments of the present application;

[0032] Figure 3 is a structural schematic diagram of a battery module of some embodiments of the present application;

[0033] Figure 4 is an exploded structural schematic diagram of a battery monomer of some embodiments of the present application;

[0034] Figure 5 is a cross-sectional schematic diagram of a battery monomer of some embodiments of the present application;

[0035] Figure 6 is an assembly schematic diagram of an electrode terminal and an end cover of some embodiments of the present application;

[0036] Figure 7 It is a schematic structural diagram of the electrode terminals of some embodiments of the present application.

[0037] Description of reference numerals:

[0038] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, upper cover; 30, housing; 400, battery module; 20, battery cell; 22, housing; 21, end cover; 211, electrode lead-out hole; 212, first end; 213, second end; 23, electrode assembly; 26, electrode terminal; 261, connecting portion; 262, terminal body; 263, top; 264, side; X, axial direction. DETAILED DESCRIPTION

[0039] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0041] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0042] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0043] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0044] The battery device 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 multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0045] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0046] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0047] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0048] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0049] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0050] The following embodiments are described by taking a vehicle 1000 as an example for convenience of illustration.

[0051] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0052] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0053] Please refer to Figure 2 , Figure 2 An exploded view of the device is provided for some embodiments of the present application. The battery device 100 includes a battery box and a battery monomer 20. In some embodiments, the battery box can include an upper cover 10 and a box 30, the upper cover 10 and the box 30 are covered with each other, and the upper cover 10 and the box 30 jointly define a containing cavity for containing the battery monomer 20. The box 30 can be a hollow structure with one end open, and the upper cover 10 can be a plate structure, which is covered on the open side of the box 30 to jointly define the containing cavity with the box 30; the upper cover 10 and the box 30 can also be hollow structures with one side open, and the open side of the upper cover 10 is covered on the open side of the box 30. Of course, the battery box formed by the upper cover 10 and the box 30 can have various shapes, such as a cylinder, a cuboid, etc.

[0054] Figure 3A structural schematic diagram of a battery module according to some embodiments of the present application. In the battery device 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery cells 20 is accommodated in the box. Of course, the battery device 100 can also be in the form that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed manner to form a battery module 400, and the multiple battery modules 400 are connected in series, in parallel, or in a mixed manner to form a whole, and are accommodated in the box. The battery device 100 can also include other structures. For example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0055] Each battery cell 20 can be a secondary battery cell or a primary battery cell, and can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0056] Please refer to Figure 4 , Figure 4 A disassembled structural schematic diagram of a battery cell according to some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes a battery. The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23, and other functional components.

[0057] The end cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to fit the shell 22. Optionally, the end cover 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 21 is not easy to deform when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength, and the safety performance can also be improved. The end cover 21 can be provided with functional components such as an electrode terminal 26. The electrode terminal 26 can be used to electrically connect with the electrode assembly 23 for outputting or inputting the electrical energy of the battery cell 20. In some embodiments, the end cover 21 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating piece can also be provided on the inner side of the end cover 21, which can be used to isolate the electrical connection components in the shell 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0058] At present, when assembling the electrode terminal and the end cover, interference is likely to occur between the end cover and the electrode terminal at the connection between the electrode terminal and the end cover, resulting in greater difficulty in assembling the electrode terminal and the end cover. In addition, metal chips are likely to be generated by friction during the transfer process. The metal chips fall into the electrode assembly, which is likely to cause a short circuit and reduce the reliability of the battery cell.

[0059] In order to solve the above technical problems, an embodiment of the present application provides a battery cell, which includes an electrode assembly, a shell and an end cover assembly. The shell has an opening, and the electrode assembly is arranged inside the shell; the end cover assembly is arranged at the opening of the shell, and the end cover assembly includes an end cover and an electrode terminal. The end cover has an electrode lead-out hole, and the electrode terminal includes a connecting portion and a terminal body. The terminal body protrudes from the connecting portion and is at least partially accommodated in the electrode lead-out hole. The cross-sectional area of ​​the electrode lead-out hole gradually increases along the axial direction of the electrode lead-out hole and in the direction pointing to the electrode assembly.

[0060] In the above scheme, by setting the electrode lead-out hole to a shape with a gradually increasing cross-sectional area along the axial direction and pointing to the electrode assembly, when the electrode terminal is installed from the end cover toward one side of the electrode assembly, the inner wall of the electrode lead-out hole will not interfere with the terminal body, thereby facilitating the assembly between the end cover and the electrode terminal. In addition, the metal chips generated by interference friction can be reduced during the assembly process, reducing the risk of metal chips falling into the electrode assembly and causing a short circuit, thereby improving the reliability of the battery cell.

[0061] Figure 5 is a schematic cross-sectional view of a battery cell according to some embodiments of the present application; Figure 6 This is a schematic diagram of the assembly of electrode terminals and end caps in some embodiments of the present application.

[0062] Please refer to Figure 5 and Figure 6 In the first aspect, an embodiment of the present application provides a battery cell 20, which includes an electrode assembly 23, a shell 22 and an end cover assembly. The shell 22 has an opening, and the electrode assembly 23 is arranged inside the shell 22; the end cover assembly is arranged at the opening of the shell 22, and the end cover assembly includes an end cover 21 and an electrode terminal 26. The end cover 21 has an electrode lead-out hole 211, and the electrode terminal 26 includes a connecting portion 261 and a terminal body 262. The terminal body 262 protrudes from the connecting portion 261 and is at least partially accommodated in the electrode lead-out hole 211. The cross-sectional area of ​​the electrode lead-out hole 211 gradually increases along the axial direction X of the electrode lead-out hole 211 and in the direction pointing to the electrode assembly 23.

[0063] The electrode terminal 26 can be an integrally formed structure made of conductive metal. The terminal body 262 protrudes upward from the connecting portion 261. When assembling the electrode terminal 26, the terminal body 262 is inserted into the electrode lead-out hole 211 from the end cap 21 toward the electrode assembly 23. The connecting portion 261 can be connected directly to the tab or via an adapter.

[0064] The electrode lead-out hole 211 may include a first end 212 and a second end 213 disposed opposite each other along the axial direction X. The second end 213 is closer to the electrode assembly 23 than the first end 212. The opening size of the first end 212 is smaller than the opening size of the second end 213, that is, the electrode lead-out hole 211 has a shape that is smaller at the top and larger at the bottom. For example, the inner wall of the electrode lead-out hole 211 may be smooth, inclined, or curved.

[0065] The shape of the terminal body 262 can match the shape of the electrode lead-out hole 211 , and the terminal body 262 is welded to the inner wall of the electrode lead-out hole 211 .

[0066] In the above scheme, by setting the electrode lead-out hole 211 to a shape with a gradually increasing cross-sectional area along the axial direction X and pointing in the direction of the electrode assembly 23, when the electrode terminal 26 is installed from the end cover 21 toward one side of the electrode assembly 23, the inner wall of the electrode lead-out hole 211 will not interfere with the terminal body, thereby facilitating the assembly between the end cover 21 and the electrode terminal 26. In addition, the metal chips generated by interference friction can be reduced during the assembly process, reducing the risk of metal chips falling into the electrode assembly 23 and causing a short circuit, thereby improving the reliability of the battery cell 20.

[0067] In some embodiments, the terminal body 262 includes a top 263 and a side 264, the side 264 is arranged around the circumference of the top 263, the side 264 away from the top 263 is connected to the connecting portion 261, the side 264 is inclined relative to the axial direction X, and the side 264 is connected to the end cover 21.

[0068] The side portions 264 may be enclosed to form a structure with a hollow center, or the entire terminal body 262 may be a solid structure with the interior enclosed by the side portions 264 being solid.

[0069] The electrode lead-out hole 211 is inclined outward from the first end 212 to the second end 213. The side portion 264 has the same shape as the electrode lead-out hole 211 and is also inclined outward. The outer surface of the side portion 264 is in contact with the inner wall of the electrode lead-out hole 211 and can be welded together.

[0070] In the above solution, the top 263 and the side 264 form a right trapezoidal shape, which not only reduces the interference of the end cover 21 on the electrode terminal 26 when the electrode terminal 26 and the end cover 21 are assembled, but also facilitates the fitting connection between the side 264 and the inner wall of the electrode lead-out hole 211.

[0071] In some embodiments, the thickness of the side portion 264 is greater than the thickness of the top portion 263 .

[0072] In the above solution, by increasing the thickness of the side portion 264 , it is possible to prevent, to a certain extent, the side portion 264 of the electrode terminal 26 from being compressed and deformed when the electrode terminal 26 and the end cover 21 are assembled.

[0073] In some embodiments, the thickness of the side portion 264 is greater than the thickness of the connecting portion 261 .

[0074] In the above solution, the side portion 264 is subjected to greater pressure relative to the connecting portion 261. Therefore, by setting the thickness of the side portion 264 to be thicker than the thickness of the connecting portion 261, the strength of the side portion 264 can be improved, thereby improving the strength of the entire end cover assembly.

[0075] Figure 7 Schematic diagram of the structure of the electrode terminal of some embodiments of the present application. Figure 7 As shown, in some embodiments, the thickness of the side portion 264 is D1, the thickness of the connecting portion 261 is D2, and D1 and D2 satisfy: 1.2≤D1 / D2≤1.4.

[0076] Wherein, D1 / D2 can be any value less than 1.2-1.4. For example, D1 / D2 can be 1.2, 1.22, 1.3, 1.38, 1.4, etc.

[0077] In the above solution, the thickness ratio of the side portion 264 to the connecting portion 261 is within a moderate range, which can ensure the strength of the end cover assembly to a certain extent and save materials.

[0078] In some embodiments, D1 and D2 satisfy: 1.25≤D1 / D2≤1.35.

[0079] Wherein, D1 / D2 can be any value less than 1.25-1.35. For example, D1 / D2 can be 1.25, 1.26, 1.27, 1.31, 1.35, etc.

[0080] In the above solution, by further limiting the range of the thickness ratio of the side portion 264 to the connecting portion 261 , the strength of the end cover assembly is further improved, and materials are further saved.

[0081] In some embodiments, the included angle between the side portion 264 and the connecting portion 261 is α1, and α1 satisfies: 100°≤α1≤150°.

[0082] Wherein, α1 can be any value less than 100°-150°. For example, α1 can be 100°, 110°, 120°, 130°, 150°, etc.

[0083] In the above solution, the angle between the side portion 264 and the connecting portion 261 is in a moderate range, which can take into account both structural strength and manufacturability.

[0084] In some embodiments, α1 satisfies: 115°≤α1≤125°.

[0085] Wherein, α1 can be any value less than 115°-125°. For example, α1 can be 115°, 116°, 118°, 121°, 125°, etc.

[0086] In the above solution, by further limiting the angle between the side portion 264 and the connecting portion 261 , the structural strength of the end cover assembly can be further improved, and the preparation is facilitated.

[0087] In some embodiments, the interior of the terminal body 262 is hollow.

[0088] That is, the interior of the side portion 264 enclosed along the circumference of the top portion 263 is hollow.

[0089] The connection portion 261 may be arranged in a surrounding manner along the circumference of the side portion 264 , or the connection portion 261 may be arranged on both sides of the side portion 264 , or a plurality of connection portions 261 arranged at intervals may be arranged along the circumference of the side portion 264 .

[0090] In the above solution, by setting the interior of the terminal body 262 to be hollow, it is possible to save material and reduce weight.

[0091] In some embodiments, the electrode assembly 23 includes an electrode body and a tab. The tab is disposed at one end of the electrode body and is connected to the connecting portion 261 .

[0092] After being bent, the tab can be welded to the side of the connecting portion 261 facing the electrode assembly 23 .

[0093] In the above solution, by directly connecting the tab to the connecting portion 261 without using a transition component, the internal space of the battery cell 20 can be saved and the energy density of the battery cell 20 can be improved.

[0094] Secondly, the embodiment of the present application also provides an end cap assembly, including an end cap 21 and an electrode terminal 26, the end cap 21 having an electrode lead-out hole 211; the electrode terminal 26 includes a connecting portion 261 and a terminal body 262, the terminal body 262 protrudes from the connecting portion 261 and is at least partially accommodated in the electrode lead-out hole 211, and the cross-sectional area of ​​the electrode lead-out hole 211 gradually increases along the axial direction X of the electrode lead-out hole 211 and in the direction pointing to the electrode assembly 23.

[0095] In a third aspect, an embodiment of the present application further provides a battery device 100 , comprising a battery cell 20 according to any of the above embodiments.

[0096] In a fourth aspect, an embodiment of the present application further provides an electrical device, comprising a battery device 100 according to any of the above embodiments, wherein the battery device 100 is used to provide electrical energy.

[0097] According to some embodiments of the present application, a battery cell 20 is provided. The battery cell 20 includes an electrode assembly 23, a housing 22, and an end cap assembly. The housing 22 has an opening, and the electrode assembly 23 is disposed within the housing 22. The end cap assembly is disposed within the opening of the housing 22. The end cap assembly includes an end cap 21 and an electrode terminal 26. The end cap 21 has an electrode lead-out hole 211. The electrode terminal 26 includes a connecting portion 261 and a terminal body 262. The terminal body 262 protrudes from the connecting portion 261 and is at least partially accommodated in the electrode lead-out hole 211. The cross-sectional area of ​​the electrode lead-out hole 211 gradually increases along the axial direction X of the electrode lead-out hole 211 and in the direction toward the electrode assembly 23. The terminal body 262 includes a top portion 263 and a side portion 264. The side portion 264 is disposed circumferentially around the top portion 263. The side portion 264, away from the top portion 263, is connected to the connecting portion 261. The side portion 264 is disposed obliquely relative to the axial direction X and is connected to the end cap 21.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: electrode assembly; a shell having an opening, wherein the electrode assembly is disposed inside the shell; An end cap assembly is arranged at the opening of the shell, and the end cap assembly includes an end cap and an electrode terminal. The end cap has an electrode lead-out hole. The electrode terminal includes a connecting portion and a terminal body. The terminal body protrudes from the connecting portion and is at least partially accommodated in the electrode lead-out hole. The cross-sectional area of ​​the electrode lead-out hole gradually increases along the axial direction of the electrode lead-out hole and in the direction pointing to the electrode assembly.

2. The battery cell according to claim 1, wherein: The terminal body comprises: top; The side portion is arranged in a surrounding manner along the circumference of the top portion, the side of the side portion away from the top portion is connected to the connecting portion, the side portion is arranged inclined relative to the axial direction, and the side portion is connected to the end cover.

3. The battery cell according to claim 2, characterized in that: The thickness of the side portion is greater than the thickness of the top portion.

4. The battery cell according to claim 2, characterized in that: The thickness of the side portion is greater than the thickness of the connecting portion.

5. The battery cell according to claim 4, characterized in that The thickness of the side portion is D1, the thickness of the connecting portion is D2, and D1 and D2 satisfy the following: 1.2≤D1 / D2≤1.

4.

6. The battery cell according to claim 5, characterized in that The D1 and the D2 satisfy: 1.25≤D1 / D2≤1.

35.

7. The battery cell according to claim 2, characterized in that: An included angle between the side portion and the connecting portion is α1, and α1 satisfies: 100°≤α1≤150°.

8. The battery cell according to claim 7, characterized in that The α1 satisfies: 115°≤α1≤125°.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The interior of the terminal body is hollow.

10. The battery cell according to any one of claims 1 to 8, characterized in that: The electrode assembly comprises: Electrode body; A tab is provided at one end of the electrode body, and the tab is connected to the connecting portion.

11. An end cap assembly, characterized in that: include: an end cap having an electrode lead-out hole; The electrode terminal includes a connecting portion and a terminal body, wherein the terminal body protrudes from the connecting portion and is at least partially accommodated in the electrode lead-out hole. The cross-sectional area of ​​the electrode lead-out hole gradually increases along the axial direction of the electrode lead-out hole and in the direction pointing to the electrode assembly.

12. A battery device, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 10.

13. An electrical device, characterized in that: The battery device according to claim 12 is included, and the battery device is used to provide electrical energy.

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