Battery cell, battery, and electric device

Abstract

The present application provides a battery cell, a battery, and an electric device. A battery cell (200) comprises a casing (221), an electrode assembly (21), and a current collecting disc (30); the electrode assembly (21) is mounted in the casing (221), and is provided with a tab (211); the current collecting disc (30) comprises a first connecting piece (31) and a second connecting piece (32); the first connecting piece (31) is mechanically connected to the second connecting piece (32); and the first connecting piece (31) is welded to the tab (211), and the second connecting piece (32) is welded to the casing (221). The first connecting piece (31) is welded to the tab (211), the second connecting piece (32) is welded to the casing (221), and the first connecting piece (31) is mechanically connected to the second connecting piece (32), thereby avoiding, to a certain extent, cracks caused by welding of the first connecting piece (31) and the second connecting piece (32).

Description

Battery cells, batteries and electrical devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 1, 2023, with application number 202322363695.7 and invention name “Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of battery technology, and more specifically, relates to a battery cell, a battery, and an electrical device. Background Art

[0003] The statements herein provide only background information related to this application and do not necessarily constitute prior art. Battery technology is a key factor in the development of electric vehicles. Cylindrical batteries require a collector plate to connect the negative electrode tab to the housing, allowing the housing to serve as the negative electrode terminal. The collector plate is typically welded to a material that is easily welded to the tab and housing. However, when welding such collector plates with different materials, cracks are prone to forming at the weld.

[0004] Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a battery cell, a battery, and an electrical device to solve the problem of welding cracks that are prone to occur when manufacturing a composite current collecting plate in the related art.

[0006] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0007] case;

[0008] The electrode assembly is installed in the shell and is provided with a tab;

[0009] The current collecting plate comprises a first connecting piece and a second connecting piece, wherein the first connecting piece is mechanically connected to the second connecting piece;

[0010] The first connecting piece is connected to the tab by welding, and the second connecting piece is connected to the shell by welding.

[0011] In the technical solution of the embodiment of the present application, the first connecting piece and the second connecting piece are mechanically connected to form a current collecting plate, so that the first connecting piece is welded to the pole piece of the battery cell, and the second connecting piece is welded to the shell of the battery cell, so as to realize the connection between the collecting plate and the shell and the pole piece, thereby improving the stability and reliability of the connection; the first connecting piece and the second connecting piece are mechanically connected, which can avoid cracks between the first connecting piece and the second connecting piece due to welding to a certain extent, improve the connection stability and current conducting capability of the first connecting piece and the second connecting piece, and thereby make the charging and discharging of the battery cell more stable, thereby improving the quality of the battery cell.

[0012] In some embodiments, the first connecting piece is connected to the second connecting piece via a rivet post.

[0013] The first connecting piece and the second connecting piece are connected by using riveted columns, which makes the connection convenient and the connection structure stable and firm.

[0014] In some embodiments, the rivet column includes a first rivet column provided on the first connecting piece, and the second connecting piece is provided with a first opening for inserting the first rivet column for riveting.

[0015] By arranging a first rivet column on the first connecting piece, arranging a first opening on the second connecting piece, and inserting the first rivet column into the first opening, the first connecting piece and the second connecting piece are riveted together, and the connection is convenient and stable.

[0016] In some embodiments, an inner diameter of one end of the first opening away from the first connecting piece is larger than an inner diameter of the other end of the first opening.

[0017] By setting the inner diameter of the first opening away from the end of the first connecting piece to be larger, it can be more stably fixedly connected to the first rivet column during riveting, thereby making the connection between the first connecting piece and the second connecting piece more stable.

[0018] In some embodiments, the first rivet post and the first connecting piece are integrally formed.

[0019] The first riveted column and the first connecting piece are integrally formed to improve the connection strength between the first riveted column and the first connecting piece.

[0020] In some embodiments, the rivet column includes a second rivet column provided on the second connecting piece, and the first connecting piece is provided with a second opening for the second rivet column to be inserted and riveted.

[0021] By arranging a second rivet column on the second connecting piece, arranging a second opening on the first connecting piece, and inserting the second rivet column into the second opening, the first connecting piece and the second connecting piece are riveted together, and the connection is convenient and stable.

[0022] In some embodiments, an inner diameter of one end of the second opening away from the second connecting piece is larger than an inner diameter of the other end of the second opening.

[0023] By setting the inner diameter of the second opening away from the end of the second connecting piece to be larger, it can be more stably fixedly connected to the second rivet column during riveting, thereby making the connection between the first connecting piece and the second connecting piece more stable.

[0024] In some embodiments, the second rivet column and the second connecting piece are integrally formed.

[0025] The second rivet column and the second connecting piece are integrally formed to improve the connection strength between the second rivet column and the second connecting piece.

[0026] In some embodiments, the rivet column includes a third rivet column, a first opening is provided on the second connecting plate, a second opening is provided on the first connecting plate at a position corresponding to the first opening, and both ends of the third rivet column are respectively inserted and riveted into the first opening and the second opening.

[0027] By setting a second opening on the first connecting piece and a corresponding first opening on the second connecting piece, the two ends of the third rivet column are inserted and riveted into the first opening and the second opening to achieve riveted connection between the first connecting piece and the second connecting piece, which is convenient for connection.

[0028] In some embodiments, the height of at least one rivet post protruding from a side of the first connecting piece away from the second connecting piece is less than or equal to 0.1 mm;

[0029] And / or, an end of at least one rivet post away from the second connecting piece is arranged flush with a surface of the first connecting piece away from the second connecting piece;

[0030] And / or, an end of at least one rivet post away from the second connecting piece is recessed relative to a surface of the first connecting piece away from the second connecting piece;

[0031] And / or, an end of at least one rivet post away from the first connecting piece is arranged flush with a surface of the second connecting piece away from the first connecting piece;

[0032] And / or, an end of at least one rivet column away from the first connecting piece is recessed relative to a surface of the second connecting piece away from the first connecting piece.

[0033] Since the electrode tabs of the electrode assembly have a certain deformation space in the shell, and the height of at least one rivet column protruding from the side of the first connecting piece away from the second connecting piece is less than or equal to 0.1 mm, the size design range of the rivet column can be wider, and the installation and use of the rivet column can be facilitated so that the first connecting piece and the second connecting piece can be riveted together.

[0034] The end of the rivet column away from the second connecting piece is flush with the surface of the first connecting piece away from the second connecting piece, which can facilitate the welding of the first connecting piece to the tab and reduce the influence of the rivet column on the welding of the tab and the first connecting piece.

[0035] The end of the rivet column away from the second connecting piece is recessed relative to the surface of the first connecting piece away from the second connecting piece. When the first connecting piece and the tab are welded, the influence of the rivet column on the welding can be reduced, thereby improving the welding quality.

[0036] The end of the rivet column away from the first connecting piece is arranged flush with the surface of the second connecting piece away from the first connecting piece so that the second connecting piece is welded to the shell, reducing the influence of the rivet column on the welding of the second connecting piece and the shell.

[0037] The end of the rivet column away from the first connecting piece is recessed relative to the surface of the second connecting piece away from the first connecting piece. When the second connecting piece is welded to the shell, the influence of the rivet column on the welding can be reduced, thereby improving the welding quality.

[0038] In some embodiments, the first connecting sheet and the second connecting sheet are stacked, and the second connecting sheet is provided with an opening that exposes a portion of the first connecting sheet.

[0039] The first connecting piece and the second connecting piece are stacked to facilitate connection between the first connecting piece and the second connecting piece; and an opening is provided on the second connecting piece to expose a portion of the first connecting piece to facilitate welding connection between the first connecting piece and the tab.

[0040] In some embodiments, the outer corridor of the second connecting piece is circular, the first connecting piece is circular, and the first connecting piece and the second connecting piece are coaxially arranged.

[0041] The outer corridor of the second connecting piece is set to be circular so that it can be used in cylindrical battery cells and easily welded to the shell; the first connecting piece is set to be circular and coaxial with the second connecting piece, which can be easily applied to cylindrical battery cells for welding to the tabs.

[0042] In some embodiments, the opening is circular.

[0043] The opening is set to be circular to facilitate application in cylindrical battery cells, and the portion of the exposed first connecting piece is also circular, which facilitates welding the first connecting piece to the tab, increases the welding area between the first connecting piece and the tab, and improves the stability of the welding.

[0044] In some embodiments, a through hole is formed in the first connecting piece at the center of the opening.

[0045] A through hole is provided on the first connecting piece, which can play a positioning role when the first connecting piece is welded to the tab, and a pressure relief mechanism is provided on the side of the shell corresponding to the collecting plate. When the battery cell expands and releases pressure, the active material in the shell can be easily ejected, thereby reducing the risk of the first connecting piece blocking the pressure relief mechanism and improving the reliability of the battery cell.

[0046] In a second aspect, an embodiment of the present application provides a battery, comprising the battery cell described in the above embodiment.

[0047] In a third aspect, an embodiment of the present application provides an electrical device comprising the battery as described in the above embodiment.

[0048] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0050] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0051] FIG2 is a schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0052] FIG3 is a schematic cross-sectional view of a battery cell according to some embodiments of the present application;

[0053] FIG4 is a bottom view schematic diagram of the structure of a battery cell according to some embodiments of the present application;

[0054] FIG5 is a schematic structural diagram of a first current collecting plate provided in some embodiments of the present application;

[0055] FIG6 is a schematic diagram of the exploded structure of the current collecting plate in FIG5 ;

[0056] FIG7 is a schematic diagram of a partial structure of the second connecting piece in FIG6 ;

[0057] FIG8 is a schematic cross-sectional view of the current collecting plate in FIG5 ;

[0058] FIG9 is a schematic cross-sectional view of a second current collecting plate provided in some embodiments of the present application;

[0059] FIG10 is a schematic cross-sectional view of a third current collecting plate provided in some embodiments of the present application;

[0060] FIG11 is a schematic cross-sectional view of a fourth current collecting plate provided in some embodiments of the present application;

[0061] FIG12 is a schematic cross-sectional view of a fifth current collecting plate provided in some embodiments of the present application;

[0062] FIG13 is a schematic structural diagram of a sixth current collecting plate provided in some embodiments of the present application.

[0063] Among them, the main markings of the figures in the figure are: 1000-vehicle; 1001-battery; 1002-controller; 1003-motor; 100-housing; 101-first part; 102-second part; 200-battery cell; 21-electrode assembly; 211-tab; 22-shell; 221-shell; 2211-cylinder; 2212-bottom cover; 222-end cover; 30-collecting plate; 31-first connecting piece; 310-through hole; 3101-weld mark; 311-second opening; 32-second connecting piece; 320-opening; 3201-welding area; 321-first opening; 33-rivet column; 331-first rivet column; 332-second rivet column; 333-third rivet column. DETAILED DESCRIPTION

[0064] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0066] In the description of the embodiments of this application, the technical terms "first," "second," etc., are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance, or to implicitly specify the quantity, specific order, or primary-secondary relationship of the technical features indicated. Therefore, a feature designated "first" or "second" may explicitly or implicitly include one or more of such features.

[0067] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present 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 herein may be combined with other embodiments in any suitable manner.

[0068] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0069] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more (including two groups), and "multiple sheets" refers to two or more (including two sheets). "Several" means one or more, unless otherwise specifically defined.

[0070] In the description of the embodiments of the present application, the technical 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this application based on specific circumstances.

[0072] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0073] In the description of the embodiments of this application, unless otherwise specified or limited, the technical term "adjacent" refers to proximity in position. For example, if there are three components A1, A2, and B, and the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, that is, A2 is adjacent to B, or B is adjacent to A2. For another example, when there are multiple components C, the multiple components C are C1, C2, ..., C N , when one of the C components, such as C2, is closer to the B component than other C components, then B is adjacent to C2, or it can be said that C2 is adjacent to B.

[0074] In the embodiments of the present application, battery cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The shapes of battery cells include, but are not limited to, cylinders, elliptical cylinders, hexagonal prisms, or other shapes. In the embodiments of the present application, the battery cells are primarily described using cylindrical battery cells.

[0075] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. The battery generally includes a casing for encapsulating one or more battery cells. The casing can, to a certain extent, prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells. In some cases, the battery cells can also be used directly, that is, the battery may not include a casing, which is not limited here.

[0076] In a battery, when there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell structure is housed within a housing. Alternatively, a battery can be constructed by first connecting multiple battery cells in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a single unit, which is then housed within a housing. The battery may also include other structures, such as a busbar assembly for electrically connecting multiple battery cells.

[0077] The battery cell in the embodiment of the present application includes an electrode assembly and a shell. The shell includes an end cover and a shell. The electrode assembly is installed in the shell. The end cover is covered on the shell, and the shell is filled with electrolyte.

[0078] The electrode assembly is also called a battery cell. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet and a separator. The electrode assembly mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The part of the positive electrode collector that is not coated with the positive electrode active material layer protrudes from the part that is coated with the positive electrode active material layer. The part that is not coated with the positive electrode active material layer serves as the positive electrode tab, or a metal conductor is welded on the positive electrode collector and led out to serve as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The portion of the negative electrode current collector not coated with the negative electrode active material layer protrudes from the portion coated with the negative electrode active material layer. The portion not coated with the negative electrode active material layer serves as the negative electrode tab. Alternatively, a metal conductor is welded to the negative electrode current collector and extended to serve as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon, silicon, or other materials.

[0079] The electrode assembly can be a wound structure. The wound structure usually involves welding the tabs to the current collector, which are then arranged in the order of positive electrode sheet - separator - negative electrode sheet - separator; and then wound to form a cylindrical or other columnar shape. The separator can be made of PP (Polypropylene) or PE (Polyethylene), etc. The separator is an insulating film provided between the positive and negative electrodes. Its main function is to isolate the positive and negative electrodes and prevent electrons in the battery from passing freely to prevent short circuits, while allowing ions in the electrolyte to pass freely between the positive and negative electrodes to form a circuit between the positive and negative electrodes. The positive and negative electrodes are collectively referred to as electrodes. The positive and negative electrode tabs are collectively referred to as tabs.

[0080] After the electrode assembly is manufactured, it needs to be placed in a housing and filled with electrolyte to immerse the electrode assembly and fully absorb the electrolyte. The electrolyte provides some active ions that serve as conductive ions during the charge and discharge process. In addition, the electrolyte provides ion channels, or carriers, allowing ions to move freely through them, thereby achieving electrical conduction between the electrodes.

[0081] To facilitate the charging and discharging of battery cells, they are often equipped with electrode terminals. Electrode terminals are conductive components located on the outer casing of a battery cell. These terminals are connected to the tabs of the electrode assembly to output electrical energy from the battery cell or charge the battery cell. A battery cell typically has two electrode terminals, one connected to the positive and negative tabs of the electrode assembly. The electrode terminal connected to the positive tab is the positive electrode terminal, and the electrode terminal connected to the negative tab is the negative electrode terminal.

[0082] An end cap is a component that covers the opening of the battery housing to isolate the internal environment of the battery cell from the external environment. The shape of the end cap can be adapted to the shape of the housing to ensure a secure fit. Optionally, the end cap can be made of a material with a certain degree of hardness and strength (such as aluminum alloy). This makes the end cap less likely to deform during compression and collision, providing the battery cell with greater structural strength and improved reliability.

[0083] The shell is a component used to cooperate with the end cap to form the internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell and the end cap can be independent components, and an opening can be provided on the shell so that the end cap covers the opening to form the internal environment of the battery cell. The shell can be of various shapes and sizes, such as cylindrical, hexagonal, etc. Specifically, the shape of the shell can be determined according to the specific shape and size of the battery cell. The shell can be made of various materials, including but not limited to iron, aluminum, stainless steel, aluminum alloy, etc.

[0084] For cylindrical battery cells, the shell generally includes a barrel and a bottom cover. The bottom cover is covered on one end of the barrel, and the end cover is covered on the other end of the barrel to form the outer shell of the battery cell. The bottom of the shell refers to the end of the shell away from the end cover. For a shell including a barrel and a bottom cover, the bottom of the shell is generally the bottom cover. For cylindrical battery cells, the bottom of the shell is often used as the negative electrode, that is, the bottom cover is used as the negative electrode. The barrel refers to the cylindrical shell structure that forms the main part of the shell, and the bottom cover refers to the cover structure that covers one end of the barrel. The bottom cover is covered on one end of the barrel to form the shell structure. The bottom cover and the barrel can be made separately and then welded together. Of course, the bottom cover and the barrel can also be formed in one piece.

[0085] The bottom of the battery cell shell is used as the negative electrode, and the negative electrode of the electrode assembly needs to be led out to the shell. For example, the negative electrode tab needs to be welded to the shell to form a guide structure, especially welded to the bottom cover to form a guide structure. However, the material of the negative electrode tab of the electrode assembly is generally copper, while the material of the shell is generally steel shell, aluminum alloy, etc. Because the tab material is different from the shell material, the expansion coefficients of different materials during welding are also different, which makes it easy to produce welding cracks during welding or damage the electrode assembly. To solve this problem, a current collecting plate structure with two materials stacked and composited is currently used. For example, a layer of copper sheet and a layer of steel sheet are set to composite, and the copper sheet is welded to the tab, and the steel sheet is welded to the shell to reduce the risk of cracks in the welding of the current collecting plate to the tab, and the welding of the current collecting plate to the shell. However, the current collecting plate is usually welded to form a composite structure with copper sheet and steel sheet. However, when this type of current collecting plate is manufactured, cracks are prone to appear at the welding point, which affects the quality of the battery cell.

[0086] Based on the above considerations, in order to solve the problem that welding cracks are prone to occur during the production of a composite current collecting plate, which affects the quality of the battery cell, an embodiment of the present application provides a battery cell, in which a current collecting plate is made by connecting a first connecting plate with a second connecting plate, so that the first connecting plate is welded to the tab of the battery cell, and the second connecting plate is welded to the shell of the battery cell, thereby reducing the risk of welding cracks generated when the current collecting plate connects the shell and the tab; and mechanically connecting the first connecting plate and the second connecting plate can avoid cracks between the first connecting plate and the second connecting plate due to welding to a certain extent, thereby improving the connection stability and current conduction capability of the first connecting plate and the second connecting plate, and thereby improving the quality of the manufactured battery cell.

[0087] The battery cells disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements, such as energy storage power supply systems for hydropower, thermal power, wind power, and solar power stations. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0088] For the convenience of description, an electric device is provided in accordance with an embodiment of the present application, and the electric device is described by taking a vehicle as an example.

[0089] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1001 is provided inside the vehicle 1000, and the battery 1001 can be provided at the bottom, head or tail of the vehicle 1000. The battery 1001 can be used to power the vehicle 1000. For example, the battery 1001 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1002 and a motor 1003. The controller 1002 is used to control the battery 1001 to power the motor 1003, for example, for starting, navigating and driving the vehicle 1000.

[0090] In some embodiments of the present application, the battery 1001 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.

[0091] Please refer to Figure 2, which is a schematic diagram of the exploded structure of a battery 1001 provided in some embodiments of the present application. The battery 1001 includes a housing 100 and a battery cell, and the battery cell is housed in the housing 100. The housing 100 is used to provide a storage space for the battery cell, and the housing 100 can adopt a variety of structures. In some embodiments, the housing 100 may include a first portion 101 and a second portion 102, the first portion 101 and the second portion 102 covering each other, and the first portion 101 and the second portion 102 jointly define a storage space for accommodating the battery cell. The second portion 102 may be a hollow structure with one end open, and the first portion 101 may be a plate-like structure, and the first portion 101 covers the open side of the second portion 102, so that the first portion 101 and the second portion 102 jointly define a storage space; the first portion 101 and the second portion 102 may also be hollow structures with one side open, and the open side of the first portion 101 covers the open side of the second portion 102. Of course, the box 100 formed by the first part 101 and the second part 102 can be of various shapes, such as a cylinder, a cuboid, etc. After multiple battery cells are connected in parallel, in series, or in a mixed combination, they are placed in the box 100 formed by the first part 101 and the second part 102 being fastened together.

[0092] Please refer to Figures 3 to 8. Figure 3 is a schematic cross-sectional view of a battery cell 200 according to some embodiments of the present application. Figure 4 is a schematic bottom-up view of a battery cell 200 according to some embodiments of the present application. Figure 5 is a schematic structural view of a current collecting tray 30 according to some embodiments of the present application. Figure 6 is a schematic exploded view of the current collecting tray 30 shown in Figure 5. Figure 7 is a schematic structural view of a portion of the second connecting piece 32 of the current collecting tray 30 shown in Figure 6. Figure 8 is a schematic cross-sectional view of the current collecting tray 30 shown in Figure 5.

[0093] An embodiment of the present application provides a battery cell 200, including: a shell 221; an electrode assembly 21, installed in the shell 221, and provided with a pole ear 211 on the electrode assembly 21; a current collecting plate 30, including a first connecting plate 31 and a second connecting plate 32, the first connecting plate 31 and the second connecting plate 32 are mechanically connected; the first connecting plate 31 is welded to the pole ear 211, and the second connecting plate 32 is welded to the shell 221.

[0094] The housing 221 is a portion of the outer shell 22 of the battery cell 200. The outer shell 22 includes the housing 221 and an end cap 222. The end cap 222 covers the opening of the housing 221 to isolate the internal environment of the battery cell 200 from the external environment. The housing 221 is used in conjunction with the end cap 222 to form the internal environment of the battery cell 200. This internal environment can be used to accommodate the electrode assembly 21, electrolyte, and other components.

[0095] The electrode assembly 21 is mounted in the housing 221, which houses and protects the electrode assembly 21. The electrode assembly 21 is provided with a tab 211, which is connected to the housing 221 to allow current to flow between the housing 221 and the tab 211. In some embodiments, when the housing 221 serves as the negative electrode of the battery cell 200, the tab 211 is the negative electrode tab. Of course, it is not ruled out that some battery cells 200 use the housing 221 as the positive electrode, in which case the tab 211 is the positive electrode tab.

[0096] The current collecting plate 30 is a conductive structure that connects the housing 221 and the tab 211 to enable current to flow between the housing 221 and the tab 211 .

[0097] The first connecting piece 31 refers to a sheet-like conductive member on the current collecting plate 30 that is welded to the tab 211. The first connecting piece 31 is provided to facilitate welding to the tab 211, thereby reducing the risk of welding cracks when the tab 211 is welded to the current collecting plate 30. The material of the first connecting piece 31 can be the same as that of the tab 211 to reduce the risk of welding cracks. Of course, the first connecting piece 31 can also be made of a material that is easy to weld to the tab 211 to reduce the risk of welding cracks. For example, when the tab 211 is copper, the first connecting piece 31 can also be made of copper.

[0098] The second connecting piece 32 refers to a sheet-like conductive part on the current collecting plate 30 that is welded to the shell 221. The second connecting piece 32 is provided to facilitate welding with the shell 221, thereby reducing the risk of welding cracks when the shell 221 and the current collecting plate 30 are welded. The material of the second connecting piece 32 can be the same as that of the shell 221 to reduce the risk of welding cracks. Of course, the second connecting piece 32 can also be made of a material that is easy to weld with the shell 221 to reduce the risk of welding cracks. For example, when the shell 221 is made of steel, the second connecting piece 32 can also be made of steel. The second connecting piece 32 can also be made of materials such as nickel. For example, when the shell 221 is made of aluminum alloy, the second connecting piece 32 can also be made of aluminum alloy.

[0099] The first connecting piece 31 is welded to the tab 211 , which can improve the stability of welding, reduce the risk of welding cracks, and reduce the risk of damage to the tab 211 and the electrode assembly 21 , thereby improving the conductivity and reliability of current between the first connecting piece 31 and the tab 211 .

[0100] The second connecting piece 32 is welded to the housing 221 , which can improve welding stability, reduce the risk of welding cracks, and improve the conductivity and reliability of current between the second connecting piece 32 and the housing 221 .

[0101] The first connecting piece 31 and the second connecting piece 32 are mechanically connected to each other, allowing current to flow between them. The first connecting piece 31 and the second connecting piece 32 are fabricated to form the current collecting tray 30. The current collecting tray 30 can be manufactured separately, ensuring a stable and reliable connection between the first connecting piece 31 and the second connecting piece 32, thereby ensuring that the current collecting tray 30 has good current conduction capability and reliability. Furthermore, there is no need to weld the first connecting piece 31 and the second connecting piece 32, thereby reducing the risk of welding cracks between the first connecting piece 31 and the second connecting piece 32. Consequently, after the current collecting tray 30 is applied to the battery cell 200, the current collecting tray 30 can conduct electricity well, thereby improving the quality of the battery cell 200.

[0102] In the technical solution of the embodiment of the present application, the first connecting piece 31 and the second connecting piece 32 are mechanically connected to form a collecting plate 30, so that the first connecting piece 31 and the pole ear 211 of the battery cell 200 can be welded, and the second connecting piece 32 and the shell 221 of the battery cell 200 can be welded, so that the collecting plate 30 is connected to the shell 221 and the pole ear 211, thereby improving the stability and reliability of the connection; the first connecting piece 31 and the second connecting piece 32 are mechanically connected, which can avoid cracks between the first connecting piece 31 and the second connecting piece 32 due to welding to a certain extent, improve the connection stability and current conduction capability of the first connecting piece 31 and the second connecting piece 32, and thereby make the charging and discharging of the battery cell 200 more stable, thereby improving the quality of the battery cell 200.

[0103] In some embodiments, the housing 221 includes a cylinder 2211 and a bottom cover 2212 . The bottom cover 2212 covers one end of the cylinder 2211 , and the second connecting piece 32 is welded to the bottom cover 2212 .

[0104] The cylinder 2211 refers to the cylindrical shell structure that forms the main part of the shell 221, and the bottom cover 2212 refers to the cover structure covering one end of the cylinder 2211. The bottom cover 2212 covers one end of the cylinder 2211 to form the shell 221 structure. The bottom cover 2212 and the cylinder 2211 can be made separately and then welded together. Of course, the bottom cover 2212 and the cylinder 2211 can also be formed in one piece. The bottom cover 2212 and the end cover 222 are respectively covered at both ends of the cylinder 2211 to form the outer shell 22 of the battery cell 200. The bottom of the shell 221 refers to the end of the shell 221 away from the end cover 222. For the shell 221 including the cylinder 2211 and the bottom cover 2212, the bottom of the shell 221 refers to the bottom cover 2212.

[0105] The second connecting piece 32 is welded to the bottom cover 2212 to realize welding the second connecting piece 32 to the shell 221 , which is convenient for connection and easier for processing and manufacturing.

[0106] In some embodiments, the first connecting piece 31 is connected to the second connecting piece 32 via a rivet post 33 .

[0107] The riveting column 33 refers to a columnar member that can be plastically deformed to rivet two structural members, such as a copper column, a steel column, etc.

[0108] The first connecting piece 31 is connected to the second connecting piece 32 via the rivet post 33 , which means that the first connecting piece 31 and the second connecting piece 32 are riveted together using the rivet post 33 .

[0109] The first connecting piece 31 and the second connecting piece 32 are connected by using the riveting column 33, which is convenient for connection and has a stable and firm connection structure.

[0110] In some embodiments, the rivet post 33 includes a first rivet post 331 disposed on the first connecting piece 31 , and the second connecting piece 32 is provided with a first opening 321 for the first rivet post 331 to be inserted into and riveted.

[0111] The first rivet post 331 refers to the rivet post 33 provided on the first connecting piece 31 .

[0112] The first opening 321 refers to a hole structure provided on the second connecting piece 32 , and the hole structure is adapted for insertion and connection of the first rivet column 331 to rivet the first rivet column 331 to the second connecting piece 32 .

[0113] By providing a first rivet column 331 on the first connecting piece 31 and a first opening 321 on the second connecting piece 32, and inserting the first rivet column 331 into the first opening 321, the first connecting piece 31 and the second connecting piece 32 are riveted together, and the connection is convenient and stable.

[0114] In some embodiments, the inner diameter of one end of the first opening 321 away from the first connecting piece 31 is larger than the inner diameter of the other end thereof.

[0115] The inner diameter of the end of the first opening 321 away from the first connecting piece 31 is larger than the inner diameter of the end of the first opening 321 close to the first connecting piece 31, so that the first rivet column 331 is inserted into the first opening 321, and when the first rivet column 331 is deformed to adapt to the inner wall of the first opening 321, the diameter of the end of the first rivet column 331 away from the first connecting piece 31 is larger, making it more difficult for the first rivet column 331 to detach from the first opening 321, thereby achieving a firm connection between the first connecting piece 31 and the second connecting piece 32.

[0116] By setting the inner diameter of the first opening 321 away from the end of the first connecting piece 31 to be larger, it can be more stably fixedly connected to the first rivet column 331 during riveting, thereby making the connection between the first connecting piece 31 and the second connecting piece 32 more stable.

[0117] In some embodiments, the first opening 321 is arranged in a stepped shape, and the inner diameter of one end of the first opening 321 close to the first connecting piece 31 is set smaller than the inner diameter of the other end, so that when the peripheral side of the first rivet column 331 abuts against the inner wall of the first opening 321, it abuts against the step of the stepped first opening 321, thereby stably fixing the second connecting piece 32 and improving the structural strength of the riveting.

[0118] In some embodiments, the first opening 321 may also be configured as a straight hole, which refers to a hole structure with a constant inner diameter. The first rivet post 331 deforms so that the periphery of the first rivet post 331 abuts against the inner wall of the first opening 321 to achieve an interference fit, thereby securing the second connecting piece 32.

[0119] Please refer to FIG. 9 , which is a schematic cross-sectional view of the current collecting plate 30 provided in some embodiments of the present application.

[0120] In some embodiments, the first opening 321 is arranged to gradually expand from the first connecting piece 31 to the second connecting piece 32, so that the inner diameter of the first opening 321 at one end close to the first connecting piece 31 is smaller than the inner diameter of the other end. When the peripheral side of the first rivet column 331 abuts against the inner wall of the first opening 321, it abuts against the step of the stepped first opening 321, thereby stably fixing the second connecting piece 32 and improving the structural strength of the riveting.

[0121] Referring to FIG. 6 and FIG. 8 , in some embodiments, the first riveted column 331 and the first connecting piece 31 are integrally formed.

[0122] Integrally formed means integrally manufactured and formed. The first rivet post 331 and the first connecting piece 31 are integrally formed, which means that the first rivet post 331 and the first connecting piece 31 are manufactured as a whole to form an integral structure. The first rivet post 331 can be pressed out from the upper section of the first connecting piece 31. Of course, the first rivet post 331 can also be welded to the first connecting piece 31. In addition, the first connecting piece 31 can be manufactured by cutting, and during cutting, the first rivet post 331 is formed on the first connecting piece 31, so that the first rivet post 331 and the first connecting piece 31 are integrally formed. The first connecting piece 31 and the first rivet post 331 can also be cast to form an integral structure of the first rivet post 331 and the first connecting piece 31.

[0123] The first rivet column 331 and the first connecting piece 31 are integrally formed to improve the connection strength between the first rivet column 331 and the first connecting piece 31 .

[0124] In some embodiments, the thickness range of the first connecting piece 31 is 0.1 millimeters (mm)-0.5 mm, such as the thickness of the first connecting piece 31 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc. Of course, the thickness of the first connecting piece 31 can also be set to other values ​​to adapt to welding with the tab 211, and the thickness of the first connecting piece 31 can be made relatively thin to reduce the space occupied in the shell 221 and improve the energy density of the battery cell 200.

[0125] In some embodiments, the thickness range of the second connecting piece 32 is 0.05mm-0.5mm, such as the thickness of the second connecting piece 32 is 0.05mm, 0.06mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc. Of course, the thickness of the second connecting piece 32 can also be set to other values ​​to adapt to welding with the shell 221, and the thickness of the second connecting piece 32 can be made relatively thin to reduce the space occupied in the shell 221 and improve the energy density of the battery cell 200.

[0126] Please refer to FIG. 10 , which is a schematic cross-sectional view of the current collecting plate 30 provided in some embodiments of the present application.

[0127] In some embodiments, the rivet post 33 includes a second rivet post 332 disposed on the second connecting piece 32 , and the first connecting piece 31 is provided with a second opening 311 for the second rivet post 332 to be inserted into and riveted.

[0128] The second rivet post 332 refers to the rivet post 33 provided on the second connecting piece 32 .

[0129] The second opening 311 refers to a hole structure provided on the first connecting piece 31 , and the hole structure is adapted for insertion and connection of the second rivet column 332 to rivet the second rivet column 332 to the first connecting piece 31 .

[0130] By providing a second rivet column 332 on the second connecting piece 32, providing a second opening 311 on the first connecting piece 31, and inserting the second rivet column 332 into the second opening 311, the first connecting piece 31 and the second connecting piece 32 are riveted together, and the connection is convenient and stable.

[0131] In some embodiments, the inner diameter of one end of the second opening 311 away from the second connecting piece 32 is larger than the inner diameter of the other end thereof.

[0132] The inner diameter of the second opening 311 at the end away from the second connecting piece 32 is larger than the inner diameter of the second opening 311 at the end close to the second connecting piece 32, so that the second rivet column 332 is inserted into the second opening 311, and when the second rivet column 332 is deformed to adapt to the inner wall of the second opening 311, the diameter of the second rivet column 332 at the end away from the second connecting piece 32 is larger, making it more difficult for the second rivet column 332 to detach from the second opening 311, thereby achieving a firm connection between the second connecting piece 32 and the first connecting piece 31.

[0133] By setting the inner diameter of the second opening 311 away from the end of the second connecting piece 32 to be larger, it can be more stably fixedly connected to the second rivet column 332 during riveting, thereby making the connection between the first connecting piece 31 and the second connecting piece 32 more stable.

[0134] In some embodiments, the second opening 311 is arranged to gradually expand from the second connecting piece 32 to the first connecting piece 31, so that the inner diameter of the second opening 311 at one end close to the second connecting piece 32 is smaller than the inner diameter of the other end. When the circumferential side of the second rivet column 332 abuts against the inner wall of the second opening 311, it abuts against the step of the stepped second opening 311, thereby stably fixing the first connecting piece 31 and improving the structural strength of the riveting.

[0135] In some embodiments, the second opening 311 is arranged in a stepped shape, and the inner diameter of one end of the second opening 311 close to the second connecting piece 32 is set smaller than the inner diameter of the other end, so that when the peripheral side of the second rivet column 332 abuts against the inner wall of the second opening 311, it abuts against the step of the stepped second opening 311, thereby stably fixing the first connecting piece 31 and improving the structural strength of the riveting.

[0136] In some embodiments, the second opening 311 may also be configured as a straight hole, which refers to a hole structure with a constant inner diameter. The second rivet post 332 deforms so that the circumference of the second rivet post 332 abuts against the inner wall of the second opening 311 to achieve an interference fit, thereby securing the first connecting piece 31.

[0137] In some embodiments, the second rivet column 332 and the second connecting piece 32 are integrally formed.

[0138] The second rivet stud 332 is integrally formed with the second connecting piece 32, meaning that the second rivet stud 332 and the second connecting piece 32 are integrally formed, forming a one-piece structure. The second rivet stud 332 can be extruded from the upper portion of the second connecting piece 32. Of course, the second rivet stud 332 can also be welded to the second connecting piece 32. Alternatively, the second connecting piece 32 can be manufactured by cutting, and the second rivet stud 332 is formed on the second connecting piece 32 during cutting, so that the second rivet stud 332 and the second connecting piece 32 are integrally formed. The second connecting piece 32 and the second rivet stud 332 can also be cast to form a one-piece structure.

[0139] The second rivet post 332 and the second connecting piece 32 are integrally formed to enhance the connection strength between the second rivet post 332 and the second connecting piece 32 .

[0140] Please refer to FIG. 11 , which is a schematic cross-sectional view of the current collecting plate 30 provided in some embodiments of the present application.

[0141] In some embodiments, the rivet column 33 includes a third rivet column 333, a first opening 321 is provided on the second connecting piece 32, a second opening 311 is provided on the first connecting piece 31 at a position corresponding to the first opening 321, and the two ends of the third rivet column 333 are respectively inserted and riveted into the first opening 321 and the second opening 311.

[0142] The first opening 321 refers to a hole structure provided on the second connecting piece 32 .

[0143] The second opening 311 refers to a hole structure provided on the first connecting piece 31 .

[0144] When the first connecting piece 31 is connected to the second connecting piece 32 , the position of the first opening 321 corresponds to the position of the second opening 311 .

[0145] The third rivet column 333 refers to a separately provided rivet column 33, and the two ends of the third rivet column 333 are respectively adapted to the first opening 321 and the second opening 311, so that one end of the third rivet column 333 can be inserted into the first opening 321, and after being squeezed and deformed, the one end of the third rivet column 333 can abut against the inner wall of the first opening 321 to rivet the one end of the third rivet column 333 into the first opening 321; and the other end of the third rivet column 333 can be inserted into the second opening 311, and after being squeezed and deformed, the other end of the third rivet column 333 can abut against the inner wall of the second opening 311 to rivet the other end of the third rivet column 333 into the second opening 311.

[0146] By setting a second opening 311 on the first connecting piece 31 and a corresponding first opening 321 on the second connecting piece 32, the two ends of the third rivet column 333 are inserted and riveted into the first opening 321 and the second opening 311 to achieve riveted connection between the first connecting piece 31 and the second connecting piece 32, which is convenient for connection.

[0147] In some embodiments, the inner diameter of the end of the first opening 321 away from the first connecting piece 31 is larger than the inner diameter of the end of the first opening 321 close to the first connecting piece 31, so that the third rivet column 333 is inserted into the first opening 321, and when the third rivet column 333 is deformed to adapt to the inner wall of the first opening 321, the diameter of the end of the third rivet column 333 away from the first connecting piece 31 is larger, making it more difficult for the third rivet column 333 to detach from the first opening 321, thereby achieving a firm connection with the second connecting piece 32.

[0148] In some embodiments, the inner diameter of the end of the second opening 311 away from the second connecting piece 32 is larger than the inner diameter of the end of the second opening 311 close to the second connecting piece 32, so that the third rivet column 333 is inserted into the second opening 311, and when the third rivet column 333 is deformed to adapt to the inner wall of the second opening 311, the diameter of the end of the third rivet column 333 away from the second connecting piece 32 is larger, making it more difficult for the third rivet column 333 to detach from the second opening 311, thereby achieving a firm connection with the first connecting piece 31.

[0149] In some embodiments, multiple locations on the first connecting piece 31 are riveted to the second connecting piece 32 to make the connection between the first connecting piece 31 and the second connecting piece 32 more stable and firm.

[0150] Please refer to FIG. 12 , which is a schematic cross-sectional view of the current collecting plate 30 provided in some embodiments of the present application.

[0151] In some embodiments, the rivet column 33 includes a first rivet column 331 provided on the first connecting plate 31 and a second rivet column 332 provided on the second connecting plate 32. The second connecting plate 32 is provided with a first opening 321 for the first rivet column 331 to be inserted for riveting; the first connecting plate 31 is provided with a second opening 311 for the second rivet column 332 to be inserted for riveting.

[0152] A first rivet column 331 is provided on the first connecting piece 31, a second rivet column 332 is provided on the second connecting piece 32, a second opening 311 is provided on the first connecting piece 31, and a first opening 321 is provided on the second connecting piece 32. The first rivet column 331 is riveted to the first opening 321, and the second rivet column 332 is riveted to the second opening 311, so that the first connecting piece 31 and the second connecting piece 32 are mechanically connected by multiple rivet columns 33, and the connection is more stable.

[0153] In some embodiments, a first rivet column 331 and a second opening 311 can be provided on the first connecting piece 31 at the same time, and a first opening 321 corresponding to the first rivet column 331 and a first opening 321 corresponding to the second opening 311 can be provided on the second connecting piece 32, so that the first rivet column 331 is riveted to the corresponding first opening 321, and the third rivet column 333 is inserted and riveted into the corresponding first opening 321 and the second opening 311, thereby realizing that multiple rivet columns 33 can mechanically connect the first connecting piece 31 and the second connecting piece 32, and the connection is more stable.

[0154] In some embodiments, a second rivet column 332 and a first opening 321 can be provided on the second connecting piece 32 at the same time, and a second opening 311 corresponding to the second rivet column 332 and a second opening 311 corresponding to the first opening 321 can be provided on the first connecting piece 31, so that the second rivet column 332 is riveted to the corresponding second opening 311, and the third rivet column 333 is inserted and riveted into the corresponding first opening 321 and the second opening 311, thereby realizing that multiple rivet columns 33 can mechanically connect the first connecting piece 31 and the second connecting piece 32, and the connection is more stable.

[0155] In some embodiments, a first rivet column 331 is provided on the first connecting piece 31, a second rivet column 332 is provided on the second connecting piece 32, and at the same time, a second opening 311 corresponding to the second rivet column 332 is provided on the first connecting piece 31, a first opening 321 corresponding to the first rivet column 331 is provided on the second connecting piece 32, a second opening 311 is provided on the first connecting piece 31, and a first opening 321 corresponding to the second opening 311 is provided on the second connecting piece 32, the first rivet column 331 is riveted to the first opening 321, the second rivet column 332 is riveted to the second opening 311, and the third rivet column 333 is inserted and riveted into the corresponding first opening 321 and second opening 311, so that multiple rivet columns 33 can mechanically connect the first connecting piece 31 and the second connecting piece 32, and the connection is more stable.

[0156] In some embodiments, the first connecting piece 31 and the second connecting piece 32 can also be mechanically connected using rivets, which is convenient to connect without welding and can avoid welding cracks between the first connecting piece 31 and the second connecting piece 32 to a certain extent.

[0157] Referring to FIG. 3 and FIG. 8 to FIG. 12 , in some embodiments, the height of at least one rivet post 33 protruding from a side of the first connecting piece 31 away from the second connecting piece 32 is less than or equal to 0.1 mm.

[0158] Since the size of a single rivet column 33 is relatively small, the first connecting piece 31 and the second connecting piece 32 are usually riveted together using a plurality of rivet columns 33 to ensure a firm connection between the first connecting piece 31 and the second connecting piece 32 .

[0159] At least one rivet post 33 protrudes from the first connecting piece 31 away from the second connecting piece 32 by a height of less than or equal to 0.1 mm. Specifically, among the multiple rivet posts 33 riveted to the first connecting piece 31 and the second connecting piece 32, one or more or all of the rivet posts 33 may protrude from the first connecting piece 31, and the rivet posts 33 may protrude from the first connecting piece 31 in a direction away from the second connecting piece 32. Furthermore, the height of the rivet posts 33 protruding from the first connecting piece 31 must be less than or equal to 0.1 mm.

[0160] Since the tab 211 of the electrode assembly 21 has a certain deformation space in the shell 221, and the height of at least one rivet column 33 protruding from the first connecting piece 31 away from the second connecting piece 32 is less than or equal to 0.1 mm, the size design range of the rivet column 33 can be wider, and the installation and use of the rivet column 33 can be facilitated so that the first connecting piece 31 and the second connecting piece 32 can be riveted together.

[0161] In some embodiments, the end of at least one rivet post 33 away from the second connecting piece 32 is flush with the surface of the first connecting piece 31 away from the second connecting piece 32. That is, among the multiple rivet posts 33 riveted to the first connecting piece 31 and the second connecting piece 32, the end surface of one or more or all of the rivet posts 33 away from the second connecting piece 32 can be flush with the surface of the first connecting piece 31 away from the second connecting piece 32.

[0162] The end of the rivet column 33 away from the second connecting piece 32 is aligned with the surface of the first connecting piece 31 away from the second connecting piece 32 , which can facilitate the welding of the first connecting piece 31 and the tab 211 and reduce the influence of the rivet column 33 on the welding of the tab 211 and the first connecting piece 31 .

[0163] In some embodiments, the end of at least one rivet post 33 away from the second connecting piece 32 is recessed relative to the surface of the first connecting piece 31 away from the second connecting piece 32. That is, among the multiple rivet posts 33 riveted to the first connecting piece 31 and the second connecting piece 32, the end surface away from the second connecting piece 32 of one or more or all of the rivet posts 33 can be recessed relative to the surface of the first connecting piece 31 away from the second connecting piece 32.

[0164] The end of the rivet column 33 away from the second connecting piece 32 is recessed relative to the surface of the first connecting piece 31 away from the second connecting piece 32. When the first connecting piece 31 is welded to the tab 211, the influence of the rivet column 33 on the welding can be reduced, thereby improving the welding quality.

[0165] In some embodiments, the end of at least one rivet post 33 away from the first connecting piece 31 is flush with the surface of the second connecting piece 32 away from the first connecting piece 31. That is, among the multiple rivet posts 33 riveted to the first connecting piece 31 and the second connecting piece 32, the end surface away from the first connecting piece 31 of one or more or all of the rivet posts 33 can be flush with the surface of the second connecting piece 32 away from the first connecting piece 31.

[0166] The end of the rivet column 33 away from the first connecting piece 31 is arranged flush with the surface of the second connecting piece 32 away from the first connecting piece 31 so that the second connecting piece 32 is welded to the shell 221, reducing the influence of the rivet column 33 on the welding of the second connecting piece 32 and the shell 221.

[0167] In some embodiments, the end of at least one rivet post 33 away from the first connecting piece 31 is recessed relative to the surface of the second connecting piece 32 away from the first connecting piece 31. That is, among the multiple rivet posts 33 riveted to the first connecting piece 31 and the second connecting piece 32, one or more or all of the rivet posts 33 away from the first connecting piece 31 can be recessed relative to the surface of the second connecting piece 32 away from the first connecting piece 31.

[0168] The end of the rivet column 33 away from the first connecting piece 31 is recessed relative to the surface of the second connecting piece 32 away from the first connecting piece 31. When the second connecting piece 32 is welded to the shell 221, the influence of the rivet column 33 on the welding can be reduced, thereby improving the welding quality.

[0169] Referring to FIG. 5 to FIG. 12 , in some embodiments, the first connecting piece 31 and the second connecting piece 32 are stacked, and the second connecting piece 32 is provided with an opening 320 that exposes a portion of the first connecting piece 31 .

[0170] The stacking arrangement means that the first connecting piece 31 and the second connecting piece 32 are stacked in the thickness direction. The first connecting piece 31 and the second connecting piece 32 are stacked so that the first connecting piece 31 and the second connecting piece 32 are mechanically connected.

[0171] The opening 320 is a through-hole structure provided on the second connecting piece 32 and passing through the thickness of the second connecting piece 32 .

[0172] Since the first connecting piece 31 and the second connecting piece 32 are stacked, an opening 320 is provided on the second connecting piece 32 , and a portion of the first connecting piece 31 can be exposed from the opening 320 , so that the first connecting piece 31 and the tab 211 can be welded from the opening 320 for easy connection.

[0173] The first connecting piece 31 and the second connecting piece 32 are stacked to facilitate connection between the first connecting piece 31 and the second connecting piece 32 ; and an opening 320 is provided on the second connecting piece 32 to expose a portion of the first connecting piece 31 to facilitate welding of the first connecting piece 31 to the tab 211 .

[0174] In some embodiments, the outer corridor of the second connecting piece 32 is circular, the first connecting piece 31 is circular, and the first connecting piece 31 and the second connecting piece 32 are coaxially arranged.

[0175] The circular outer corridor of the second connecting piece 32 means that the second connecting piece 32 is designed to be circular as a whole, which can better adapt to the application of cylindrical battery cells 200. Moreover, the circular design of the second connecting piece 32 eliminates the need to rotate the second connecting piece 32 around the central axis of the cylindrical battery cell 200 when applied to the cylindrical battery cell 200, thereby facilitating the welding of the second connecting piece 32 to the housing 221. In addition, the circular design of the second connecting piece 32 and the welding area 3201 formed by the welding of the second connecting piece 32 and the housing 221 can be designed to be circular to facilitate welding. The area of ​​the welding area 3201 is also designed to be larger, thereby improving the firmness and reliability of the welding between the second connecting piece 32 and the housing 221 and reducing internal resistance.

[0176] The circular shape of the first connecting piece 31 means that the first connecting piece 31 is configured as a circular structure as a whole. The circular shape of the first connecting piece 31 facilitates connection between the first connecting piece 31 and the tab 211 when used in a cylindrical battery cell 200, without rotating the first connecting piece 31 around the central axis of the cylindrical battery cell 200.

[0177] The coaxial arrangement of the first connecting piece 31 and the second connecting piece 32 means that the central axis of the first connecting piece 31 is coaxial with the central axis of the second connecting piece 32 , so as to facilitate the positioning of the first connecting piece 31 and the second connecting piece 32 and thus facilitate application to the cylindrical battery cell 200 .

[0178] The outer corridor of the second connecting piece 32 is set to be circular so that it can be used in a cylindrical battery cell 200 and is convenient for welding to the shell 221; the first connecting piece 31 is set to be circular and coaxially arranged with the second connecting piece 32, which can be conveniently applied to a cylindrical battery cell 200 for welding to the tab 211.

[0179] In some embodiments, the opening 320 on the second connecting piece 32 is circular.

[0180] The circular opening 320 on the second connecting tab 32 facilitates use in cylindrical battery cells 200 and facilitates the design and manufacture of the opening 320. The exposed portion of the first connecting tab 31 is also circular, facilitating welding of the first connecting tab 31 to the tab 211. This also increases the weld area between the first connecting tab 31 and the tab 211, improving weld stability. Furthermore, the circular opening 320 and the circular first connecting tab 31 allow for a circular weld mark 3101 between the first connecting tab 31 and the tab 211, facilitating welding and increasing the weld area, reducing internal resistance, and improving current conduction capability.

[0181] In some embodiments, the opening 320 may also be provided in other shapes, such as an ellipse, a polygon, etc.

[0182] Please refer to FIG. 5 to FIG. 13 , FIG. 13 is a schematic cross-sectional view of the current collecting plate 30 provided in some embodiments of the present application.

[0183] In some embodiments, a through hole 310 is defined at the center of the collecting plate 30 .

[0184] The through hole 310 refers to a hole structure that penetrates the structural member.

[0185] The center position of the collecting plate 30 refers to the geometric center position of the collecting plate 30. For example, when the collecting plate 30 is circular, the center position of the collecting plate 30 is the center of the collecting plate 30. When the collecting plate 30 is a regular polygon, the center position of the collecting plate 30 is the symmetric center of the collecting plate 30.

[0186] A through hole 310 is provided at the center of the collecting plate 30 , which can play a positioning role when assembling the collecting plate 30 , facilitating welding of the first connecting piece 31 of the collecting plate 30 to the tab 211 and the second connecting piece 32 of the collecting plate 30 to the housing 221 .

[0187] In some embodiments, the through hole 310 is circular, elliptical, or polygonal. The through hole 310 is configured as a circular, elliptical, or polygonal shape to facilitate design and production.

[0188] Referring to FIG. 5 to FIG. 12 , in some embodiments, the first connecting piece 31 defines a through hole 310 at the center of the opening 320 .

[0189] The through hole 310 refers to a hole structure that penetrates the structural member.

[0190] Since the through hole 310 is located at the center of the circle corresponding to the opening 320 on the first connecting piece 31, the through hole 310 of the first connecting piece 31 actually passes through the entire current collecting plate 30. Since the through hole 310 is opened at the center of the circle corresponding to the opening 320 on the first connecting piece 31, the through hole 310 is also located at the center of the current collecting plate 30.

[0191] A through hole 310 is provided on the first connecting piece 31, which can play a positioning role when the first connecting piece 31 is welded to the tab 211, and a pressure relief mechanism is provided on the side of the shell 221 corresponding to the collecting plate 30. When the battery cell 200 expands and releases pressure, the active material in the shell 221 can be easily ejected, thereby reducing the risk of the first connecting piece 31 blocking the pressure relief mechanism and improving the reliability of the battery cell 200.

[0192] The pressure relief mechanism refers to a structural component such as a pressure relief valve or explosion-proof valve on the battery cell 200. When the battery cell 200 expands abnormally, the pressure relief mechanism is used to eject gas or liquid generated in the battery cell 200 to relieve pressure in the battery cell 200.

[0193] In some embodiments, the through hole 310 is circular, oval, or polygonal.

[0194] The through hole 310 is set to be circular, elliptical or polygonal to facilitate design and production; when the through hole 310 is set to be polygonal, and a pressure relief mechanism is set on the side of the shell 221 corresponding to the collecting plate 30, when the battery cell 200 expands and releases pressure, the first connecting piece 31 can be torn from the corners of the through hole 310 to facilitate the ejection of the active material in the shell 221, reducing the risk of the first connecting piece 31 blocking the pressure relief mechanism and improving the reliability of the battery cell 200.

[0195] Referring to Figure 13 , in some embodiments, one side of the first connecting piece 31 is stacked with one side of the second connecting piece 32, and the first connecting piece 31 and the second connecting piece 32 are riveted together via rivet posts 33. This structure can simplify the structure of the collecting plate 30, reduce material usage, and lower costs.

[0196] According to some embodiments of the present application, a battery cell 200 is provided, comprising a housing 221, an electrode assembly 21, and a current collecting plate 30. The electrode assembly 21 is mounted in the housing 221, and a tab 211 is provided on the electrode assembly 21. The current collecting plate 30 comprises a first connecting plate 31 and a second connecting plate 32. The first connecting plate 31 and the second connecting plate 32 are riveted together via rivet posts 33. The first connecting plate 31 is welded to the tab 211, and the second connecting plate 32 is welded to the housing 221. The first connecting plate 31 and the second connecting plate 32 are stacked, and the second connecting plate 32 is provided with an opening 320 that exposes a portion of the first connecting plate 31. The stacking of the first and second connecting plates 31 and 32 facilitates connection between the first and second connecting plates 31 and 32. The opening 320 is provided in the second connecting plate 32 to expose a portion of the first connecting plate 31, facilitating the welding connection between the first connecting plate 31 and the tab 211. The second connecting piece 32 has a circular outer porch, and the first connecting piece 31 is circular. The first connecting piece 31 and the second connecting piece 32 are arranged coaxially. The circular outer porch of the second connecting piece 32 facilitates its application in cylindrical battery cells 200, facilitating welding to the housing 221. The circular shape of the first connecting piece 31 and its coaxial arrangement with the second connecting piece 32 facilitates its application in cylindrical battery cells 200, allowing for welding to the tab 211. The circular shape of the second connecting piece 32 and the housing 221 form a welded area 3201, which can be circular for easier welding. The area of ​​the welded area 3201 is larger to enhance the strength and reliability of the weld between the second connecting piece 32 and the housing 221 and reduce internal resistance.

[0197] According to some embodiments of the present application, the present application also provides a battery, comprising the battery cell described in any of the above solutions.

[0198] According to some embodiments of the present application, the present application also provides an electrical device, comprising the battery described in any of the above solutions.

[0199] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0200] 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: case; An electrode assembly is installed in the housing, and a pole ear is provided on the electrode assembly; A current collecting plate, comprising a first connecting piece and a second connecting piece, wherein the first connecting piece is mechanically connected to the second connecting piece; The first connecting piece is connected to the tab by welding, and the second connecting piece is connected to the shell by welding.

2. The battery cell according to claim 1, characterized in that: The first connecting piece is connected to the second connecting piece through a riveted column.

3. The battery cell according to claim 2, characterized in that: The riveting column comprises a first riveting column arranged on the first connecting piece, and the second connecting piece is provided with a first opening for the first riveting column to be inserted and riveted.

4. The battery cell according to claim 3, characterized in that: The inner diameter of one end of the first opening away from the first connecting sheet is larger than the inner diameter of the other end of the first opening.

5. The battery cell according to claim 3 or 4, characterized in that: The first riveted column and the first connecting piece are integrally formed.

6. The battery cell according to any one of claims 2 to 5, characterized in that: The riveted column comprises a second riveted column arranged on the second connecting piece, and the first connecting piece is provided with a second opening for the second riveted column to be inserted and riveted.

7. The battery cell according to claim 6, characterized in that: The inner diameter of one end of the second opening away from the second connecting sheet is larger than the inner diameter of the other end of the second opening.

8. The battery cell according to claim 6 or 7, characterized in that: The second riveted column and the second connecting piece are integrally formed.

9. The battery cell according to any one of claims 2 to 8, characterized in that: The riveted column includes a third riveted column, the second connecting plate is provided with a first opening, the first connecting plate is provided with a second opening at a position corresponding to the first opening, and two ends of the third riveted column are respectively inserted and riveted into the first opening and the second opening.

10. The battery cell according to any one of claims 2 to 9, characterized in that: The height of at least one of the riveted columns protruding from the side of the first connecting piece away from the second connecting piece is less than or equal to 0.1 mm; And / or, one end of at least one of the riveted columns away from the second connecting piece is arranged flush with a surface of the first connecting piece away from the second connecting piece; And / or, an end of at least one of the riveted columns away from the second connecting piece is recessed relative to a surface of the first connecting piece away from the second connecting piece; And / or, one end of at least one of the riveted columns away from the first connecting piece is arranged flush with a surface of the second connecting piece away from the first connecting piece; And / or, an end of at least one of the rivet columns away from the first connecting piece is recessed relative to a surface of the second connecting piece away from the first connecting piece.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The first connecting sheet and the second connecting sheet are stacked, and the second connecting sheet is provided with an opening exposing a partial area of ​​the first connecting sheet.

12. The battery cell according to claim 11, characterized in that: The outer corridor of the second connecting piece is circular, the first connecting piece is circular, and the first connecting piece and the second connecting piece are coaxially arranged.

13. The battery cell according to claim 11 or 12, characterized in that: The opening is circular.

14. The battery cell according to claim 13, characterized in that: The first connecting sheet is provided with a through hole at the center of the opening.

15. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 14.

16. An electrical device, characterized in that: Comprising the battery of claim 15.

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