Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a battery monomer, a battery device and electric equipment, and the battery monomer comprises a shell, at least one side of which is provided with an opening; the top cover and the shell are enclosed to form an accommodating cavity, and a pole hole is formed in the top cover; the electrode assembly is arranged in the accommodating cavity; the pole assembly comprises a pole body and a limiting piece, and the pole body is arranged in the pole hole; the limiting piece is arranged on the periphery of the pole body in a surrounding manner and comprises a first connecting section and a second connecting section; the second connecting section is connected with the top cover, a first clamping groove is formed in the peripheral surface of the pole body, the end part of the first connecting section is clamped in the first clamping groove, and the first connecting section is arranged in a manner of inclining towards the first clamping groove in a direction parallel to the top cover at an upward gradient. According to the present invention, the limiting member is arranged to replace a plurality of structures such as a pole outer ring and a pole reversible deformation ring in the current pole structure, such that the number of parts can be effectively reduced, the structure of the single battery can be simplified, and the production efficiency can be improved on the basis of achieving the limiting and fixing effects on the pole body.

Description

Technical Field

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

[0002] With the rapid development of new energy technologies, battery devices are increasingly being used in the market, resulting in increasingly demanding performance requirements. Within the structure of a battery device, a battery cell is the smallest unit. A battery cell has a terminal, which is used to electrically connect to external electrical devices or other equipment, thereby enabling the input and output of power from the battery cell.

[0003] However, in the current battery cell structure, the structure of the pole is usually more complicated and includes more parts, which not only increases the production cost but also leads to lower production efficiency of the battery cell. Utility Model Content

[0004] Based on this, it is necessary to provide a battery cell, a battery device and an electrical device to address the problem that the current pole structure is relatively complex and has many parts, resulting in high production costs and low production efficiency.

[0005] In a first aspect, the present application provides a battery cell comprising a shell, a top cover, an electrode assembly, and a terminal assembly, wherein at least one side of the shell has an opening; the top cover is sealed to the opening and, together with the shell, forms a receiving cavity, wherein the top cover is provided with a terminal hole; the electrode assembly is provided within the receiving cavity; the terminal assembly comprises a terminal body and a retaining member, wherein the terminal body is provided within the terminal hole and is electrically connected to the electrode assembly; the retaining member is provided around the periphery of the terminal body and comprises a first connecting segment and a second connecting segment integrally formed and oppositely disposed; wherein the first connecting segment is connected to the terminal body, and the second connecting segment is connected to the top cover. A first latching groove is provided on the outer peripheral surface of the terminal body, wherein an end of the first connecting segment facing away from the second connecting segment is latched in the first latching groove, and the first connecting segment is inclined in an upward slope toward the first latching groove in a direction parallel to the top cover, thereby providing a support force along the thickness direction of the top cover to keep the terminal body away from the top cover.

[0006] The limiting piece can replace multiple pole structures such as the pole outer ring and the pole anti-deformation ring. On the basis of achieving the limiting and fixing function of the pole body, it can effectively reduce the number of parts, simplify the structure of the battery cell, and improve production efficiency.

[0007] With the above structure, the limiting member can be more stably connected between the pole body and the top cover, and the pole body can be more stably arranged in the pole hole.

[0008] With the above structure, the first connecting section and the pole body can be clamped together through the first clamping groove, so that the first connecting section and the pole body are stably connected and the pole body is stably supported in the pole hole.

[0009] Through the above structure, the first connecting section can provide an upward supporting force for the pole body during the welding process between the pole body and the busbar, that is, provide a supporting force for the pole body away from the seal, which can reduce the probability of the pole body crushing the seal under the action of the downward pressure of the busbar, causing leakage in the pole assembly.

[0010] In some embodiments, the inclination angle between the first connecting section and the plane where the top cover is located ranges from 10° to 30°.

[0011] Setting the inclination angle between the first connecting section and the plane where the top cover is located within the above range can not only enable the end of the first connecting section to be smoothly engaged in the first slot, but also provide appropriate supporting force to the pole body through the first connecting section, thereby reducing the probability of the seal being pressed downward during welding of the pole body, thereby causing leakage of the pole assembly.

[0012] In some embodiments, the inclination angle between the first connecting section and the plane on which the top cover lies is in a range of 15° to 25°. Therefore, by setting the inclination angle between the first connecting section and the plane on which the top cover lies within this range, the end of the first connecting section can be smoothly engaged with the first engaging groove, while further controlling the supporting force applied by the first connecting section to the pole body within an appropriate range, thereby improving the supporting effect of the first connecting section on the pole body.

[0013] In some embodiments, a second slot is defined on a surface of the top cover facing away from the accommodating cavity, and an end of the second connecting section facing away from the first connecting section is engaged in the second slot.

[0014] With the above structure, the second connecting section is more stably engaged in the second engaging groove, which facilitates the installation between the limiting member and the top cover and improves the connection stability of the limiting member between the pole body and the top cover.

[0015] In some embodiments, the top cover includes a main body and an extension portion, wherein the extension portion is connected to an end of the main body close to the pole hole and extends toward the pole hole; the extension portion and the main body are jointly arranged to form a second slot.

[0016] Through the above structure, the extension portion and the main body portion can be jointly surrounded to form a second clamping groove, and the second connecting section can be stably clamped in the second clamping groove.

[0017] In some embodiments, the pole assembly further includes a seal surrounding the outer periphery of the pole body, the seal being sealed between the pole body and the extension along the thickness direction of the top cover. The provision of the seal can improve the sealing effect between the pole body and the top cover.

[0018] In some embodiments, in the thickness direction, a convex portion is formed on a surface of the extension portion facing the sealing member, and a concave portion is formed on a surface of the sealing member facing the extension portion to engage with the convex portion.

[0019] By providing the convex portion and the concave portion that engage with each other, the connection between the sealing member and the limiting member can be made more stable, thereby improving the sealing stability of the sealing member between the pole body and the limiting member.

[0020] In some embodiments, the extension portion is inclined toward the sealing member in an upward slope in a direction parallel to the top cover, so as to provide a supporting force to the sealing member along the thickness direction.

[0021] Thus, the extension portion provides a certain upward supporting force for the seal, which can cooperate with the downward pressure of the pole body to make the seal fit more closely with the pole body and the extension portion, thereby improving the sealing performance.

[0022] In some embodiments, the first connecting section is inclined with an upward slope toward the pole body in a direction parallel to the top cover; wherein the inclination angle of the extension portion is greater than the inclination angle of the first connecting section.

[0023] Thus, the extension portion can provide an upward supporting force for the seal, so that the seal and the pole body fit more closely, thereby improving the sealing performance.

[0024] In some embodiments, the inclination angle between the extension portion and the plane where the top cover is located ranges from 5° to 45°.

[0025] Setting the inclination angle between the extension portion and the plane where the top cover is located within the above range can not only effectively improve the sealing performance of the seal between the pole body and the top cover, but also reduce the probability of the seal being crushed and causing sealing failure.

[0026] In some embodiments, the angle of inclination between the extension and the plane of the top cover is in a range of 20° to 45°. Setting the angle of inclination between the extension and the plane of the top cover within this range can further improve the sealing performance of the seal and reduce the probability of seal failure.

[0027] In a second aspect, the present application also provides a battery device comprising the battery cell described above.

[0028] In a third aspect, the present application also provides an electrical device comprising the battery device as described above.

[0029] The above-mentioned battery cells, battery devices and electrical equipment, by providing limiting parts to replace multiple structures such as the pole outer ring and the pole anti-deformation ring in the current pole structure, can effectively reduce the number of parts, simplify the structure of the battery cells and improve production efficiency on the basis of achieving the limiting and fixing functions of the pole body. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments.

[0031] Figure 2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments.

[0032] Figure 3 is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments.

[0033] Figure 4 FIG. 1 is a top view of a top cover in a battery cell according to one or more embodiments.

[0034] Figure 5 Schematic diagram of the exploded structure of a top cover in a battery cell according to one or more embodiments.

[0035] Figure 6 FIG. 1 is a side view of a top cover in a battery cell according to one or more embodiments.

[0036] Figure 7 for Figure 6 Middle AA section view.

[0037] Figure 8 1 is a cross-sectional view of a terminal body, a limiting member, and a sealing member in a battery cell according to one or more embodiments.

[0038] Figure 9 for Figure 8 A partial enlarged view of point B in the middle.

[0039] Explanation of the accompanying drawings: 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, housing; 20, battery cell; 11, first part; 12, second part; 21, top cover; 22, shell; 23, electrode assembly; 24, pole assembly; 25, pole hole; 26, upper plastic; 27, lower plastic; 211, second slot; 212, main body; 213, extension; 214, convex portion; 241, pole body; 242, limiter; 243, seal; 244, first connecting section; 245, second connecting section; 246, first slot; 247, recessed portion; a, thickness direction. DETAILED DESCRIPTION

[0040] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0042] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0043] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0044] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0046] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in other fields. As the application of power batteries continues to expand, market demand is also growing.

[0047] A battery cell is the smallest unit of a battery device and typically consists of a top cover, a housing, and an electrode assembly housed within a cavity formed by the top cover and housing. The electrode assembly is typically formed by stacking or winding a positive electrode sheet, a separator, and a negative electrode sheet. Each positive and negative electrode sheet has a tab. Furthermore, a terminal is provided on the top cover. By electrically connecting the tab to the terminal via a connector, the battery cell can output and input power through the terminal on the top cover.

[0048] In the current structure of a battery cell, the structure of the pole usually includes multiple parts such as the pole body, the pole outer ring, the pole anti-deformation ring, and a seal. The multiple parts are connected to each other to form the positive or negative electrode of the battery cell.

[0049] In this case, the pole structure of the battery cell is relatively complex, the production cost is high and the production efficiency is low.

[0050] Based on the above considerations, in order to solve the problem that the current pole structure is relatively complex and has many parts, resulting in high production costs and low production efficiency, a battery cell is provided in one or more embodiments of the present application. By setting a limiting member to replace multiple structures such as the pole outer ring and the pole anti-deformation ring in the current pole structure, while achieving the limiting and fixing function of the pole body, it can effectively reduce the number of parts, simplify the structure of the battery cell, and improve production efficiency.

[0051] It should be noted that 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.

[0052] 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 into a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] The battery device disclosed in the embodiments of the present application can be used in, but is not limited to, electrical equipment such as vehicles, ships, or aircraft.

[0057] The present invention provides an electrical device that uses a battery device as a power source. The electrical device may include, 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, and the like. 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, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0058] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0059] Please refer to Figure 1The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0060] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0061] Please refer to Figure 2 The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can have a variety of structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which cover each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open, and the first portion 11 can be a plate-like structure, with the first portion 11 covering the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 can also be hollow structures with one end open, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0062] In the battery device 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 20 may be housed within the housing 10. Alternatively, the battery device 100 may comprise multiple battery cells 20 connected in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 10. The battery device 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0063] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0064] Please refer to Figure 3 A battery cell 20 is the smallest unit that makes up a battery. A battery cell 20 typically includes a top cover 21, a housing 22, an electrode assembly 23, and other functional components. The top cover 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the top cover 21 can be adapted to the shape of the housing 22 to match the housing 22. Functional components such as electrode terminals, also known as electrode posts, can be provided on the top cover 21. The electrode terminals can be used to electrically connect to the electrode assembly 23 to output or input electrical energy from the battery cell 20. In some embodiments, the top cover 21 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. In some embodiments, an insulating member can also be provided on the inner side of the top cover 21 to isolate the electrical connection components in the housing 22 from the top cover 21 to reduce the risk of short circuits. Exemplary insulating members can be made of plastic, rubber, etc.

[0065] The shell 22 is a component used to cooperate with the top cover 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components. The shell 22 and the top cover 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the top cover 21. Without limitation, the top cover 21 and the shell 22 can also be integrated. Specifically, the top cover 21 and the shell 22 can form a common connection surface before other components are put into the shell. When the interior of the shell 22 needs to be encapsulated, the top cover 21 is covered with the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23.

[0066] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 is mainly composed of a positive electrode sheet, a separator, and a negative electrode sheet. Specifically, the positive electrode active material and the negative electrode active material are coated on the current collector respectively, thereby forming a positive electrode sheet and a negative electrode sheet respectively. The positive electrode sheet and the negative electrode sheet are wound or stacked, and the separator is arranged between the positive electrode sheet and the negative electrode sheet, thereby forming the electrode assembly 23. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 23, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current circuit.

[0067] Please also refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 as well as Figure 7 In one embodiment of the present application, a battery cell 20 is provided, comprising a shell 22, a top cover 21, an electrode assembly 23, and a pole assembly 24. The shell 22 has an opening on at least one side, the top cover 21 is sealed in the opening, and together with the shell 22, forms a receiving cavity. A pole hole 25 is provided on the top cover 21. The electrode assembly 23 is disposed in the receiving cavity, and the pole assembly 24 comprises a pole body 241 and a limiting member 242. The pole body 241 is disposed in the pole hole 25 for electrical connection with the electrode assembly 23. The limiting member 242 is disposed around the outer periphery of the pole body 241, and comprises a first connecting segment 244 and a second connecting segment 245 that are integrally formed and arranged opposite to each other. The first connecting segment 244 is connected to the pole body 241, and the second connecting segment 245 is connected to the top cover 21.

[0068] It should be noted that the housing 22 is a hollow structure for accommodating the electrode assembly 23 and other functional components. The housing 22 can be a rectangular structure with an opening on one side or on two opposite sides.

[0069] The top cover 21 can be sealed against the opening. That is, the top cover 21 is used to seal the opening of the housing 22 and, together with the housing 22, form a housing cavity capable of accommodating the electrode assembly 23 and other functional components. Thus, the top cover 21 and the housing 22 cooperate with each other to protect the electrode assembly 23 and other functional components within the housing cavity.

[0070] The top cover 21 is provided with a pole hole 25 . To correspond to the positive pole and the negative pole, two pole holes 25 are usually provided on the top cover 21 , one corresponding to the positive pole and the other to the negative pole.

[0071] The electrode assembly 23 typically includes a positive electrode sheet, a separator, and a negative electrode sheet. The positive electrode sheet is formed with a positive electrode tab, and the negative electrode sheet is formed with a negative electrode tab. The positive electrode tab is electrically connected to the positive electrode post, and the negative electrode tab is electrically connected to the negative electrode post. This allows the positive and negative electrode posts to output and input power during the battery cell 20 cycle.

[0072] The pole assembly 24 is at least partially disposed in the pole hole 25 and is capable of forming a positive pole and a negative pole.

[0073] The pole assembly 24 includes a pole body 241 and a retaining member 242. The pole body 241 is a component for electrically connecting to the positive or negative tab. Therefore, the pole body 241 is placed in the corresponding pole hole 25, and the positive or negative tab is electrically connected to the pole body 241 via an adapter. In addition, the retaining member 242 limits and secures the pole body 241 in the pole hole 25, and the seal 243 seals the gap between the pole body 241 and the top cover 21.

[0074] Specifically, when the pole body 241 is arranged in the pole hole 25, the limiting member 242 is arranged around the outer circumference of the pole body 241, and one end of the limiting member 242 is connected to the pole body 241, and the other end is connected to the top cover 21, so that the pole body 241 in the pole hole 25 can be limited in a direction perpendicular or parallel to the top cover 21, thereby fixing the pole body 241 in the pole hole 25.

[0075] In addition, the battery cell 20 may further include an upper plastic 26 , which may be disposed on a side of the pole body 241 away from the accommodating cavity and bonded to the pole body 241 , thereby filling the gap between the pole body 241 and the limiting member 242 to achieve sealing therebetween.

[0076] Therefore, the limiting member 242 can replace multiple pole structures such as the pole outer ring and the pole anti-deformation ring. On the basis of achieving the limiting and fixing function of the pole body 241, it can effectively reduce the number of parts, simplify the structure of the battery cell 20, and improve production efficiency.

[0077] It should be noted that the first connecting segment 244 and the second connecting segment 245 are sequentially arranged along the radial direction of the pole hole 25 , and the first connecting segment 244 and the second connecting segment 245 are integrally formed, so that the overall structure of the limiting member 242 is more stable.

[0078] The limiting member 242 is sleeved on the outer periphery of the pole body 241, the first connecting section 244 is connected to the pole body 241, and the second connecting section 245 is connected to the top cover 21. In this way, the limiting member 242 can play a role in stabilizing the connection between the pole body 241 and the top cover 21.

[0079] With the above structure, the limiting member 242 can be more stably connected between the pole body 241 and the top cover 21 , and the pole body 241 can be more stably disposed in the pole hole 25 .

[0080] In some embodiments, a first slot 246 is defined on the outer circumference of the pole body 241 , and the end of the first connecting section 244 facing away from the second connecting section 245 is engaged in the first slot 246 .

[0081] Specifically, the end of the first connecting segment 244 facing away from the second connecting segment 245 is the end of the first connecting segment 244 disposed toward the pole body 241 .

[0082] The outer circumference of the pole body 241 is parallel to the axial direction of the pole hole 25 . A first slot 246 is formed on the outer circumference of the pole body 241 , that is, the opening of the first slot 246 faces the first connecting section 244 .

[0083] In this way, the end of the first connecting section 244 can be inserted into the first locking groove 246, so that the first connecting section 244 and the first locking groove 246 are mutually engaged. In this way, the first connecting section 244 can support the pole body 241 in the pole hole 25 along the radial direction of the pole hole 25, so that the pole body 241 is more stably arranged in the pole hole 25.

[0084] With the above structure, the first connecting section 244 and the pole body 241 can be clamped together through the first clamping groove 246 , so that the first connecting section 244 and the pole body 241 are stably connected and the pole body 241 is stably supported in the pole hole 25 .

[0085] like Figure 7 and Figure 8 As shown, in some embodiments, the first connecting section 244 is inclined toward the first slot 246 in an upward slope in a direction parallel to the top cover 21 to provide support force for the pole body 241 away from the top cover 21 along the thickness direction a of the top cover 21.

[0086] Specifically, the first connecting section 244 extends in a direction parallel to the top cover 21 and is inclined upwardly toward the first slot 246. In other words, the first connecting section 244 is inclined relative to the top cover 21 and is inclined upwardly toward the first slot 246.

[0087] When the end of the first connecting section 244 is engaged in the first engaging groove 246 , an upwardly inclined supporting force is actually applied to the pole body 241 .

[0088] It should be noted that during the assembly of the battery cell 20, the busbar needs to be welded to the pole of the battery cell 20, that is, to the pole body 241. During the welding process, the busbar is connected to the top surface of the pole body 241, and the busbar will form a downward pressure on the pole body 241.

[0089] Therefore, through the above structure, the first connecting section 244 can provide an upward supporting force for the pole body 241 during the welding process between the pole body 241 and the bus, that is, provide a supporting force for the pole body 241 away from the seal 243, which can reduce the probability that the pole body 241 will crush the seal 243 under the action of the downward pressure of the bus, causing leakage in the pole assembly 24.

[0090] In some embodiments, the inclination angle θ1 between the first connecting section 244 and the plane where the top cover 21 is located ranges from 10° to 30°.

[0091] It should be noted that the inclination angle of the first connecting section 244 affects whether the end of the first connecting section 244 can be smoothly and stably engaged with the first engaging groove 246 , and also affects the magnitude of the supporting force provided by the first connecting section 244 on the pole body 241 .

[0092] In other words, the inclination angle range between the first connecting section 244 and the plane of the top cover 21 must not only allow the end of the first connecting section 244 to be smoothly engaged with the first engaging groove 246, but also ensure that the supporting force provided by the first connecting section 244 on the pole body 241 is within an appropriate range. If the supporting force is too great, a gap may form between the pole body 241 and the seal 243, resulting in seal failure. If the supporting force is too small, the seal 243 may be easily crushed due to the strong downward pressure on the pole body 241 during welding of the pole body 241 to the busbar, causing leakage from the pole assembly 24.

[0093] Therefore, setting the inclination angle between the first connecting section 244 and the plane where the top cover 21 is located within the above-mentioned range can not only enable the end of the first connecting section 244 to be smoothly engaged in the first slot 246, but also provide appropriate supporting force to the pole body 241 through the first connecting section 244, thereby reducing the probability of the seal 243 being pressed downward during welding of the pole body 241, thereby causing leakage of the pole assembly 24.

[0094] As a specific embodiment, the inclination angle between the first connecting section 244 and the plane where the top cover 21 is located can be set to, but is not limited to, 10°, 15°, 20°, 25°, or 30°.

[0095] In some embodiments, the inclination angle θ1 between the first connecting section 244 and the plane where the top cover 21 is located ranges from 15° to 25°.

[0096] Furthermore, by setting the inclination angle between the first connecting section 244 and the plane where the top cover 21 is located within the above-mentioned range, it is possible to further control the supporting force applied by the first connecting section 244 to the pole body 241 within an appropriate range on the basis of achieving smooth insertion of the end of the first connecting section 244 into the first slot 246, thereby improving the supporting effect of the first connecting section 244 on the pole body 241.

[0097] As a specific embodiment, the inclination angle between the first connecting section 244 and the plane where the top cover 21 is located can be set to, but is not limited to, 15°, 17°, 20°, 22°, or 25°.

[0098] In some embodiments, a second slot 211 is defined on a surface of the top cover 21 facing away from the accommodating cavity, and an end of the second connecting section 245 facing away from the first connecting section 244 is engaged in the second slot 211 .

[0099] Specifically, when the top cover 21 is sealed against the opening of the housing 22, the lower surface of the top cover 21 faces the interior of the accommodating cavity, while the upper surface of the top cover 21 faces away from the accommodating cavity. Specifically, a second latching groove 211 is defined on the upper surface of the top cover 21, and the end of the second connecting section 245 facing away from the first connecting section 244 is latched into the second latching groove 211. This allows the position-limiting member 242 to be connected between the pole body 241 and the top cover 21.

[0100] Furthermore, when the end of the second connecting section 245 is engaged in the second slot 211 , the second connecting section 245 and the second slot 211 can be fixedly connected by welding to achieve sealing between the limiting member 242 and the top cover 21 .

[0101] The above structure allows the second connecting section 245 to be more stably engaged in the second engaging groove 211 , facilitating the installation of the limiting member 242 and the top cover 21 , and improving the connection stability of the limiting member 242 between the pole body 241 and the top cover 21 .

[0102] In some embodiments, the top cover 21 includes a main body 212 and an extension 213. The extension 213 is connected to one end of the main body 212 near the pole hole 25 and extends toward the pole hole 25. The extension 213 and the main body 212 together form a second slot 211.

[0103] Specifically, the main body 212 is arranged in the horizontal direction, the extension portion 213 is connected to one end of the main body 212 close to the pole hole 25, and the extension portion 213 is set downward relative to the main body 212, so that the second slot 211 can be smoothly formed between the extension portion 213 and the main body 212.

[0104] In some embodiments, the pole assembly 24 further includes a seal 243 surrounding the outer periphery of the pole body 241. The seal 243 is sealed between the pole body 241 and the extension 213 along the thickness direction a of the top cover 21. The provision of the seal 243 can improve the sealing effect between the pole body 241 and the top cover 21.

[0105] Furthermore, the seal 243 can be set as a sealing ring and is arranged around the outer circumference of the pole body 241. The seal 243 is set on the side of the pole body 241 away from the limiter 242 along the thickness direction a of the top cover 21, so that the seal 243 can be sealed and connected between the pole body 241 and the top cover 21.

[0106] Furthermore, the pole body 241 can protrude on the outer peripheral surface to form a convex ring, the first groove 246 is formed on the upper side of the convex ring, the extension portion 213 is located below the convex ring, and the upper surface of the sealing ring abuts against the lower surface of the convex ring, so that the sealing ring can be sealed and connected between the convex ring and the extension portion 213.

[0107] Through the above structure, on the one hand, the extension portion 213 and the main body portion 212 can be jointly formed to form the second slot 211, and the second connecting section 245 can be stably clamped in the second slot 211. On the other hand, the sealing member 243 can be more stably sealed and connected between the pole body 241 and the extension portion 213.

[0108] like Figure 8 and Figure 9 As shown, in some embodiments, in the thickness direction a, a convex portion 214 is protruded from the surface of the extension portion 213 facing the sealing member 243, and a concave portion 247 that is snap-fitted with the convex portion 214 is recessed from the surface of the seal 243 facing the extension portion 213.

[0109] Specifically, the upper surface of the extension portion 213 protrudes upward to form a convex portion 214, which can be arranged in a ring shape. Correspondingly, the lower surface of the sealing member 243 is recessed to form a concave portion 247, which can also be arranged in a circle.

[0110] When the seal 243 is sealed and connected between the pole body 241 and the extension portion 213, the upper surface of the seal 243 abuts against the convex ring of the pole body 241, and the convex portion 214 of the extension portion 213 is clamped in the concave portion 247 of the seal 243, thereby achieving positioning and fixation between the seal 243 and the extension portion 213.

[0111] By providing the protrusion 214 and the recess 247 that engage with each other, the connection between the seal 243 and the limiter 242 can be made more stable, thereby improving the sealing stability of the seal 243 between the pole body 241 and the limiter 242.

[0112] In some embodiments, the extension portion 213 is inclined toward the sealing member 243 in an upward slope in a direction parallel to the top cover 21 to provide a supporting force to the sealing member 243 along the thickness direction a.

[0113] Specifically, the extension portion 213 extends toward the pole body 241 and is inclined upward toward the seal 243. That is, the extension portion 213 is inclined relative to the top cover 21 and is inclined upward toward the seal 243.

[0114] In this way, the extension portion 213 can be smoothly engaged with the recess 247 of the seal 243 through the protrusion 214. At the same time, the extension portion 213 can also apply an upward supporting force to the seal 243, making the seal 243 and the pole body 241 closer.

[0115] It should be noted that when the pole body 241 is welded to the busbar, the busbar applies downward pressure to the pole body 241. The pole body 241 moves downward under the pressure, thereby transmitting the pressure to the sealing member 243.

[0116] Thus, the extension portion 213 provides a certain upward supporting force to the seal 243 , which can cooperate with the downward pressure of the pole body 241 to make the seal 243 more closely cooperate with the pole body 241 and the extension portion 213 , thereby improving the sealing performance.

[0117] In some embodiments, the first connecting section 244 is inclined in an upward direction toward the pole body 241 in a direction parallel to the top cover 21 , wherein the inclination angle θ2 of the extension portion 213 is greater than the inclination angle θ1 of the first connecting section 244 .

[0118] Specifically, when the inclination angle of the extension portion 213 is greater than the inclination angle of the first connecting section 244 , the extension portion 213 can provide an upward supporting force for the seal 243 , so that the seal 243 and the pole body 241 fit more closely, thereby improving the sealing performance.

[0119] In some embodiments, the inclination angle θ2 between the extension portion 213 and the plane where the top cover 21 is located ranges from 5° to 45°.

[0120] Specifically, the inclination angle of the extension 213 affects the sealing effect of the seal 243 between the pole body 241 and the top cover 21. Therefore, setting the inclination angle between the extension 213 and the plane on which the top cover 21 lies within the above-mentioned range can not only effectively improve the sealing performance of the seal 243 between the pole body 241 and the top cover 21, but also reduce the probability of the seal 243 being crushed and causing sealing failure.

[0121] As a specific embodiment, the inclination angle between the extension portion 213 and the plane where the top cover 21 is located can be, but is not limited to, set to 5°, 15°, 25°, 35°, or 45°.

[0122] In some embodiments, the inclination angle θ2 between the extension portion 213 and the plane where the top cover 21 is located ranges from 20° to 45°.

[0123] Furthermore, by setting the inclination angle between the extension portion 213 and the plane where the top cover 21 is located within the above range, the sealing performance of the sealing member 243 can be further improved and the probability of sealing failure can be reduced.

[0124] It can be understood that the structure of the battery cell 20 also includes a lower plastic 27 and other functional components. For example, the lower plastic 27 is arranged in the accommodating cavity and is located between the top cover 21 and the electrode assembly 23 to isolate and insulate the top cover 21 and the electrode assembly 23.

[0125] Based on the same concept as the above-mentioned battery cell 20 , the present application further provides a battery device 100 , including the above-mentioned battery cell 20 .

[0126] Based on the same concept as the above-mentioned battery device 100 , the present application further provides an electrical device, including the above-mentioned battery device 100 .

[0127] According to one or more embodiments, when the present application is used, the electrode assembly 23 is first placed inside the housing 22, and then the top cover 21 is sealed and placed at the opening of the housing 22. At the same time, a pole hole 25 is opened on the top cover 21, and the pole body 241 is placed in the pole hole 25 to facilitate electrical connection between the positive and negative pole tabs of the electrode assembly 23 and the corresponding pole body 241.

[0128] Furthermore, when the pole body 241 is disposed in the pole hole 25, the stopper 242 surrounds the outer circumference of the pole body 241, and the end of the first connecting section 244 is engaged in the first engaging groove 246, while the end of the second connecting section 245 is engaged in the second engaging groove 211. In this way, the stopper 242 is stably connected between the pole body 241 and the top cover 21.

[0129] In addition, the seal 243 is disposed around the outer circumference of the pole body 241 , and the protrusion 214 of the extension 213 is engaged with the recess 247 on the seal 243 , so that the seal 243 can be sealed between the pole body 241 and the top cover 21 .

[0130] After the terminal assembly 24 is assembled, the busbar and the terminal body 241 need to be welded to enable the input and output of power from the battery cell 20. During the welding process, the busbar applies downward pressure to the terminal body 241. At the same time, the inclined first connecting section 244 can exert an upward supporting force on the terminal body 241. This can reduce the probability of the terminal body 241 pressing down on the seal 243, resulting in seal failure.

[0131] Furthermore, the extension portion 213 is tilted upward, which can provide an upward support force for the seal 243 , so that the seal 243 is more tightly connected between the pole body 241 and the extension portion 213 , thereby improving the sealing stability between the pole body 241 and the top cover 21 .

[0132] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery cell, characterized in that: include: a housing having an opening on at least one side; A top cover is sealed on the opening and encloses the housing together to form a receiving cavity, and a pole hole is formed on the top cover; an electrode assembly, disposed in the accommodating cavity; and A pole assembly, comprising a pole body and a stopper, wherein the pole body is disposed in the pole hole and is electrically connected to the electrode assembly; the stopper is disposed around the outer periphery of the pole body and comprises a first connecting section and a second connecting section that are integrally formed and disposed opposite to each other; The first connecting section is connected to the pole body, and the second connecting section is connected to the top cover; a first clamping groove is provided on the outer peripheral surface of the pole body, and the end of the first connecting section facing away from the second connecting section is clamped in the first clamping groove, and the first connecting section is inclined toward the first clamping groove in a direction parallel to the top cover with an upward slope, so as to provide a supporting force for the pole body to be away from the top cover along the thickness direction of the top cover.

2. The battery cell according to claim 1, wherein: The inclination angle between the first connecting section and the plane where the top cover is located ranges from 10° to 30°.

3. The battery cell according to claim 2, characterized in that: The inclination angle between the first connecting section and the plane where the top cover is located ranges from 15° to 25°.

4. The battery cell according to claim 1, wherein: A second slot is formed on a surface of the top cover facing away from the accommodating cavity, and an end of the second connecting section facing away from the first connecting section is engaged in the second slot.

5. The battery cell according to claim 4, characterized in that The top cover includes a main body and an extension portion, wherein the extension portion is connected to one end of the main body close to the pole hole and extends toward the pole hole; the extension portion and the main body are jointly arranged to form the second slot.

6. The battery cell according to claim 5, characterized in that The pole assembly further includes a sealing member surrounding the outer periphery of the pole body, wherein the sealing member is sealed and connected between the pole body and the extension portion along a thickness direction of the top cover.

7. The battery cell according to claim 6, characterized in that In the thickness direction, a convex portion is formed on a surface of the extension portion facing the sealing member, and a concave portion is formed on a surface of the sealing member facing the extension portion to engage with the convex portion.

8. The battery cell according to claim 6, characterized in that The extension portion is inclined toward the sealing member at an upward slope in a direction parallel to the top cover, so as to provide a supporting force to the sealing member along the thickness direction.

9. The battery cell according to claim 8, characterized in that The first connecting section is arranged in an upward slope in a direction parallel to the top cover and toward the pole body; Wherein, the inclination angle of the extension portion is greater than the inclination angle of the first connecting section.

10. The battery cell according to claim 9, characterized in that The inclination angle between the extension portion and the plane where the top cover is located ranges from 5° to 45°.

11. The battery cell according to claim 10, characterized in that The inclination angle between the extension portion and the plane where the top cover is located ranges from 20° to 45°.

12. A battery device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 11.

13. An electrical device, characterized in that: Comprising the battery device as claimed in claim 12.

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