Battery cells, batteries and electrical devices

Abstract

The present application relates to the field of batteries, and provides a battery cell, a battery and an electrical device. The battery cell includes an electrode assembly, an electrode terminal and an adapter. The electrode terminal is provided with a through hole. The adapter is electrically connected between the electrode terminal and the electrode assembly. A convex portion is provided on the side of the adapter facing the electrode terminal, and the convex portion is inserted into the through hole. One of the outer peripheral surface of the convex portion and the hole wall of the through hole is provided with a groove, and the other of the two is provided with a protrusion that is snap-fitted with the groove. Based on the above arrangement, the gap between the convex portion and the through hole can be effectively blocked in the connection area between the convex portion and the groove via the protrusion. In this way, during the welding operation of the convex portion and the electrode terminal, the metal particles generated during the welding can be prevented from sputtering from the gap between the convex portion and the through hole into the battery cell via the protrusion, thereby reducing the risk of the metal particles generated during the welding having an adverse effect on the electrical properties in the battery cell, and maintaining and optimizing the electrical properties inside the battery cell.

Description

Technical Field

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

[0002] In some cases, the battery cell includes an electrode terminal and an adapter, the adapter is provided with a protrusion on the side facing the electrode terminal, the electrode terminal is penetrated by a through hole corresponding to the protrusion, the protrusion is inserted into the through hole and welded to the electrode terminal, so that the adapter and the electrode terminal are electrically connected.

[0003] However, metal particles generated during welding may be sputtered into the interior of the battery cell along the gap between the protrusion and the through hole, thereby adversely affecting the electrical performance inside the battery cell. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which are intended to solve the problem that metal particles generated during welding may sputter into the interior of the battery cell along the gap between the protrusion and the through hole.

[0005] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is:

[0006] In a first aspect, a battery cell is provided, the battery cell comprising:

[0007] Electrode assembly;

[0008] An electrode terminal, wherein the electrode terminal is provided with a through hole;

[0009] The adapter is electrically connected between the electrode terminal and the electrode assembly. A convex portion is provided on the side of the adapter facing the electrode terminal, and the convex portion is inserted into the through hole. A groove is provided on one of the outer peripheral surface of the convex portion and the hole wall of the through hole, and a protrusion that is snap-fitted with the groove is provided on the other of the two.

[0010] The battery cell provided in the embodiment of the present application can be connected by inserting the convex part of the adapter into the through hole of the electrode terminal, and the convex part and the through hole can be buckled and matched via the protrusion and the groove, so as to facilitate the preliminary establishment of a reliable mechanical connection relationship and electrical connection relationship between the adapter and the electrode terminal, and effectively block the gap between the convex part and the through hole via the convex part in the connection area of ​​the convex part and the groove. Based on this, it is convenient to weld the convex part and the electrode terminal from the outside of the electrode terminal, which can improve the welding convenience, welding quality, welding yield, and improve the connection convenience, connection reliability and connection strength of the mechanical connection and electrical connection between the adapter and the electrode terminal. Furthermore, during the welding operation of the protrusion and the electrode terminal, most of the metal particles generated during welding can be blocked on the outside of the electrode terminal. In particular, the protrusion can prevent the metal particles from sputtering from the gap between the protrusion and the through hole into the battery cell, thereby reducing the risk of the metal particles generated during welding being sputtered and remaining in the battery cell, reducing the risk of the metal particles generated during welding adversely affecting the electrical performance of the battery cell, and maintaining and optimizing the electrical performance inside the battery cell.

[0011] In some embodiments, the protrusions are strip-shaped protrusions.

[0012] By adopting the above scheme, compared with point-like protrusions or other discontinuous protrusions, by making the protrusions into continuously extended strip-like protrusions, the protrusions can be enabled to form continuous and more contact points and contact areas with the grooves, thereby improving the connection stability and connection reliability between the protrusions and the grooves, and enabling the protrusions to provide a linear, continuous, wider and reliable sealing range, and optimizing the sealing effect of the protrusions on the gaps between the protrusions and the through holes, thereby reducing the risk of metal particles sputtering from the gaps between the protrusions and the through holes into the battery cells, and maintaining and optimizing the electrical performance inside the battery cells.

[0013] In some embodiments, the protrusion is an annular protrusion.

[0014] By adopting the above scheme, by making the protrusion an annular protrusion, the protrusion can form more contact points and a larger contact area with the groove, which can improve the connection stability and connection reliability between the protrusion and the groove. In addition, the protrusion can occupy a certain range in the circumferential direction of the protrusion, and the protrusion can form a continuous and wide blocking range in the circumferential direction of the protrusion, which can optimize the blocking effect of the protrusion on the gap between the protrusion and the through hole, thereby reducing the risk of metal particles sputtering from the gap between the protrusion and the through hole into the battery cell, and maintaining and optimizing the electrical performance inside the battery cell.

[0015] In some embodiments, the protrusion is in the shape of a closed ring.

[0016] By adopting the above scheme, by making the protrusion in a closed ring shape, the protrusion can form evenly distributed contact points and contact areas with the groove based on the characteristic that the ring has no obvious starting point and end point, thereby improving the connection stability and connection reliability between the protrusion and the groove. In addition, the protrusion in a closed ring shape can provide complete sealing and blocking properties within the ring range, and the protrusion can block the gap between the protrusion and the through hole to a greater extent and a larger range, thereby reducing the risk of metal particles sputtering from the gap between the protrusion and the through hole into the battery cell, and maintaining and optimizing the electrical performance inside the battery cell.

[0017] In some embodiments, the circumferential direction of the protrusion intersects the axial direction of the protrusion.

[0018] By adopting the above scheme, by making the circumferential direction of the protrusion intersect with the axial direction of the protrusion, the protrusion can be extended to a larger range in the circumferential direction of the protrusion, and the protrusion can be enabled to form a continuous and wide blocking range in the circumferential direction of the protrusion. In particular, when the protrusion is in a closed ring shape, the protrusion can be enabled to form a continuous and comprehensive blocking range in the circumferential direction of the protrusion, and the protrusion can be enabled to fully block the gap in the entire circumference of the protrusion. In this way, the blocking effect of the protrusion on the gap between the protrusion and the through hole can be optimized, the risk of metal particles sputtering from the gap between the protrusion and the through hole into the battery cell can be reduced, and the electrical performance inside the battery cell can be maintained and optimized.

[0019] In some embodiments, the width of the protrusion is gradually reduced in a direction approaching the groove bottom of the groove.

[0020] By adopting the above scheme, by gradually reducing the width of the protrusion in the direction close to the bottom of the groove, the resistance of the protrusion to be inserted into the groove can be reduced during the assembly of the protrusion and the groove, so that the protrusion can be easily and quickly inserted into the groove, thereby facilitating the assembly of the protrusion and the groove, and improving the assembly convenience and assembly efficiency between the protrusion and the through hole (especially between the protrusion and the groove). In addition, due to the gradual change of the width of the protrusion, the protrusion and the groove can be adaptively compensated for the tolerance in the assembly during the cooperation, and the tightness can be adaptively adjusted and reliable, thereby improving the reliability and stability of the buckle cooperation between the protrusion and the groove.

[0021] In some embodiments, the protrusion has a fixing surface and a guiding surface. The fixing surface is arranged on the side of the protrusion away from the groove. The guiding surface is arranged opposite to the groove wall of the groove. The guiding surface is obliquely connected to the fixing surface. The angle formed between the guiding surface and the fixing surface is an acute angle.

[0022] By adopting the above scheme, in the case where the hole wall of the through hole is provided with a protrusion, during the assembly of the protrusion and the through hole, the guide surface connected to the fixed surface at an angle can guide the part of the protrusion away from the electrode assembly to easily and quickly pass over the protrusion, and the protrusion can be guided to be easily and quickly inserted into the groove, which can reduce the assembly friction and assembly resistance of the protrusion, thereby facilitating assembly, and improving the assembly convenience and assembly efficiency between the protrusion and the through hole (especially between the protrusion and the groove). Similarly, in the case where the outer peripheral surface of the protrusion is provided with a protrusion, during the assembly of the protrusion and the through hole, the guide surface connected to the fixed surface at an angle can guide the part of the protrusion provided with the protrusion to easily and quickly enter the through hole, and the protrusion can be guided to be easily and quickly inserted into the groove, which can reduce the assembly friction and assembly resistance of the protrusion, thereby facilitating assembly, and improving the assembly convenience and assembly efficiency between the protrusion and the through hole (especially between the protrusion and the groove). Furthermore, when the protrusion is engaged with the groove, the guide surface and the groove wall of the groove can adaptively compensate for the assembly tolerance and achieve a snug fit, thereby improving the reliability and stability of the fit between the protrusion and the groove.

[0023] In some embodiments, the angle formed between the guide surface and the fixing surface is 5° to 30°.

[0024] By adopting the above scheme, by making the angle formed between the guide surface and the fixed surface 5° to 30°, on the one hand, the smoothness of the plug-in fit between the protrusion and the through hole (especially between the protrusion and the groove) can be improved, the assembly resistance and assembly friction can be reduced, and the assembly convenience and assembly efficiency between the protrusion and the through hole (especially between the protrusion and the groove) can be improved. On the other hand, the guide surface of the protrusion and the groove wall of the groove can be fitted tightly, and a moderate fitting pressure can be formed between the protrusion and the groove, especially a moderate fitting pressure can be formed between the guide surface and the groove wall of the groove, so that a better assembly effect can be formed between the protrusion and the groove, and the reliability of the snap fit between the protrusion and the groove can be improved.

[0025] In some embodiments, on any longitudinal cross-section of the protrusion and the through hole, the maximum radial dimension of the protrusion is D1, the minimum radial dimension of the through hole is D2, ε is calculated by (D1-D2) / D1, and ε is configured as: 0≤ε≤3.5%.

[0026] By adopting the above scheme, in the case where the hole wall of the through hole is provided with a protrusion, ε can be calculated by (D1-D2) / D1 to reflect the potential reduction degree of the radial dimension of the part of the protrusion away from the electrode assembly (i.e., the part that needs to cross the protrusion) through ε. And by making 0≤ε≤3.5%, the potential reduction degree of the radial dimension of the part of the protrusion away from the electrode assembly is limited, so that the risk of shrinking and deforming of the part of the protrusion away from the electrode assembly is small. Based on this, the risk of the part of the protrusion away from the electrode assembly increasing the gap between the through hole due to shrinkage and deformation can be reduced, thereby facilitating the welding between the protrusion and the electrode terminal, improving the welding yield, and reducing the risk of metal particles generated during welding from the gap between the protrusion and the through hole into the battery cell. This embodiment is more suitable for the situation where "the hole wall of the through hole is provided with a protrusion, and the outer peripheral surface of the protrusion is provided with a groove".

[0027] By adopting the above scheme, when the outer peripheral surface of the convex part is provided with a convexity, ε can be calculated by (D1-D2) / D1 to reflect the potential reduction degree of the radial dimension at the convex point of the convexity corresponding to the convexity through ε. And by making 0≤ε≤3.5%, the potential shrinkage deformation risk at the convex point of the convexity corresponding to the convexity can be limited. Based on this, the risk of the convex point of the convexity corresponding to the convexity from entering the through hole to matching with the groove can be reduced, and the risk of the convex point of the convexity corresponding to the convexity and the groove matching deterioration due to shrinkage deformation can be reduced, so that the plugging effect of the convexity can be achieved as expected, and the risk of metal particles generated during welding from the gap between the convexity and the through hole to the battery cell can be reduced.

[0028] In some embodiments, the cross-sectional shape of the protrusion is trapezoidal, arched or fan-shaped, and the cross-sectional shape of the protrusion is parallel to the axial direction of the protrusion.

[0029] By adopting the above scheme, by making the cross-sectional shape of the protrusion trapezoidal, arched or fan-shaped, on the one hand, the shape of the protrusion can be regularized to facilitate the processing and forming of the protrusion. On the one hand, the sealing effect of the protrusion can be optimized, so that the protrusion can seal the gap between the protrusion and the through hole, and reduce the risk of metal particles generated during welding from the gap between the protrusion and the through hole splashing into the battery cell. On the one hand, during the assembly of the protrusion and the through hole, it is convenient to guide the protrusion to be easily and quickly inserted into the groove through the trapezoidal inclined surface, the arched curved surface, and the fan-shaped curved surface, thereby reducing the assembly friction and assembly resistance of the protrusion, facilitating assembly, and improving the assembly convenience and assembly efficiency between the protrusion and the through hole (especially between the protrusion and the groove).

[0030] In some embodiments, the cross-sectional shape of the protrusion is circular, and the cross-sectional shape of the protrusion is perpendicular to the axial direction of the protrusion.

[0031] By adopting the above solution, by making the cross-sectional shape of the protrusion circular, the cross-sectional shape of the through hole can also be correspondingly circular. Based on this, the protrusion can be quickly and conveniently inserted into the through hole without excessive alignment or positioning, thereby simplifying the assembly process and improving the flexibility, convenience and efficiency of assembly.

[0032] In a second aspect, a battery is provided, the battery comprising the battery cell provided in the embodiment of the present application.

[0033] By adopting the above solution, the battery can optimize the electrical performance and reliability of the battery by applying the battery cells provided in the embodiments of the present application.

[0034] In a third aspect, an electrical device is provided, which includes the battery provided in an embodiment of the present application, or the battery cell provided in an embodiment of the present application.

[0035] By adopting the above solution, the performance of the electrical device can be optimized by applying the battery or battery cell provided in the embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0038] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0039] Figure 3 A front view of a battery cell provided for some embodiments of the present application;

[0040] Figure 4 for Figure 3 A cross-sectional view along AA is provided;

[0041] Figure 5 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, wherein a groove is provided on the outer peripheral surface of the convex portion, and a protrusion is provided on the hole wall of the through hole;

[0042] Figure 6 for Figure 5 Exploded schematic diagram of the electrode terminals and adapters provided;

[0043] Figure 7A partial cross-sectional view of a battery cell provided in some other embodiments of the present application, wherein a protrusion is provided on the outer peripheral surface of the convex portion, and a groove is provided on the hole wall of the through hole;

[0044] Figure 8 for Figure 7 Exploded diagram of the provided electrode terminals and adapter.

[0045] Among them, the reference numerals in the figure are:

[0046] 1-battery, 2-controller, 3-motor; 100-battery unit, 200-box, 201-first part, 202-second part;

[0047] 10-battery cell, 11-shell, 111-shell, 112-end cover; 12-electrode terminal, 12a-positive electrode terminal, 12b-negative electrode terminal, 121-through hole, 1211-protrusion, 12111-fixing surface, 12112-guide surface; 13-converter, 13a-positive electrode converter, 13b-negative electrode converter, 131-protrusion, 1311-groove; 14-insulating structure; 15-electrode assembly, 151-electrode body, 152-ear, 152a-positive electrode ear, 152b-negative electrode ear; α-angle formed between the guiding surface and the fixing surface, D1-maximum radial dimension of the protrusion, D2-minimum radial dimension of the through hole, z-axial direction of the protrusion. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clear and understandable, the application is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0049] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In the present application, "axial" refers to the extension direction of the center line of the corresponding structure, "radial" refers to any direction passing through the center line and perpendicular to the center line of the corresponding structure, and "circumferential" refers to the circumferential direction of the ring formed by the outer peripheral surface of the corresponding structure.

[0053] A battery cell is the smallest unit for storing and outputting electrical energy. In some cases, a battery cell includes an electrode terminal and an adapter. The electrode terminal is an electrical connection component between a battery cell and external components, used to output or input electrical energy. The adapter is an electrical connection component between an electrode terminal and internal components of a battery cell (i.e., an electrode assembly), used to transmit electrical energy.

[0054] In some cases, a convex portion is provided on one side of the adapter facing the electrode terminal, and a through hole corresponding to the convex portion passes through the electrode terminal. The convex portion is inserted into the through hole and welded to the electrode terminal, so that the adapter and the electrode terminal are electrically connected.

[0055] However, due to the gap between the protrusion and the through hole, metal particles generated during welding may be sputtered into the interior of the battery cell along the gap between the protrusion and the through hole, thereby adversely affecting the electrical performance inside the battery cell.

[0056] Therefore, some embodiments of the present application provide a battery cell, which can be inserted into the through hole of the electrode terminal by inserting the protrusion of the adapter into the through hole, and the protrusion and the through hole are engaged with each other via the protrusion and the groove, so as to facilitate the preliminary establishment of a reliable mechanical connection relationship and electrical connection relationship between the adapter and the electrode terminal, and effectively block the gap between the protrusion and the through hole via the protrusion in the connection area of ​​the protrusion and the groove. Based on this, it is convenient to weld the protrusion and the electrode terminal from the outside of the electrode terminal, which can improve the welding convenience, welding quality, welding yield, and improve the connection convenience, connection reliability and connection strength of the mechanical connection and electrical connection between the adapter and the electrode terminal. Furthermore, during the welding operation of the protrusion and the electrode terminal, most of the metal particles generated during welding can be blocked on the outside of the electrode terminal. In particular, the protrusion can prevent the metal particles from sputtering from the gap between the protrusion and the through hole into the battery cell, thereby reducing the risk of the metal particles generated during welding being sputtered and remaining in the battery cell, reducing the risk of the metal particles generated during welding adversely affecting the electrical performance of the battery cell, and maintaining and optimizing the electrical performance inside the battery cell.

[0057] The battery cell disclosed in the embodiment of the present application can be a lithium-ion secondary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc. The battery cell can be cylindrical, flat, rectangular or other shapes, etc. The battery cell can be packaged in different ways to form a cylindrical battery cell, a square battery cell or a soft-pack battery cell, etc.

[0058] The battery cells disclosed in the embodiments of the present application can be used independently or in combination with other battery cells to form a modular battery that can provide higher voltage and capacity, such as a battery module, a battery module or a battery pack.

[0059] The battery cells and batteries disclosed in the embodiments of the present application can be used in electrical devices that use battery cells and batteries as power sources, or in various energy storage systems that use battery cells and batteries as energy storage elements. The electrical device may be, but is not limited to, a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like.

[0060] In order to illustrate the technical solution provided by the present application, the following is a detailed description with reference to specific drawings and embodiments, and taking "the electrical device being a vehicle" as an example.

[0061] See also Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1 is provided inside the vehicle, and the battery 1 may be provided at the bottom, head or tail of the vehicle. The battery 1 is used to power the vehicle, for example, the battery 1 can be used as an operating power source for the vehicle. The vehicle may also include a controller 2 and a motor 3, and the controller 2 is used to control the battery 1 to power the motor 3, for example, for starting, navigating and driving the vehicle. Working power requirements.

[0062] In some embodiments of the present application, the battery 1 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0063] See also Figure 2 , Figure 2 The exploded schematic diagram of the battery 1 provided in some embodiments of the present application. The battery 1 includes a battery cell 100 and a box 200, and the battery cell 100 is contained in the box 200. Among them, the box 200 is used to provide a storage space for the battery cell 100, and the box 200 can adopt a variety of structures. In some embodiments, the box 200 may include a first part 201 and a second part 202, and the first part 201 and the second part 202 cover each other, and the first part 201 and the second part 202 jointly define a storage space for accommodating the battery cell 100. The second part 202 may be a hollow structure with one end open, and the first part 201 may be a plate-like structure, and the first part 201 covers the open side of the second part 202, so that the first part 201 and the second part 202 jointly define a storage space; the first part 201 and the second part 202 may also be hollow structures with one side open, and the open side of the first part 201 covers the open side of the second part 202. Of course, the box body 200 formed by the first part 201 and the second part 202 can be in various shapes, such as a cylinder, a cuboid, etc.

[0064] In the battery 1 , there may be at least two battery cells 100 , and the at least two battery cells 100 may be connected in series, in parallel, or in mixed connection. Mixed connection means that at least two battery cells 100 are connected in series and in parallel.

[0065] Specifically, the battery unit 100 may be a battery cell 10 (eg Figure 3As shown). At least two battery cells 10 can be directly connected in series, in parallel or in mixed connection, and then the whole formed by at least two battery cells 10 is accommodated in the box body 200. Among them, the battery cell 10 can be a lithium-ion secondary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc. The battery cell 10 can be cylindrical, flat, rectangular or other shapes, etc. The battery cell 10 can be packaged in different ways to form a cylindrical battery cell, a square battery cell or a soft-pack battery cell, etc.

[0066] Alternatively, the battery unit 100 may be a battery module or a battery module. At least two battery cells 10 may be connected in series, in parallel, or in a hybrid connection to form a modular structure, i.e., a battery module or a battery module; at least two battery modules or battery modules may then be connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 200.

[0067] Of course, the battery 1 may also include other structures. For example, the battery 1 may also include a busbar component (not shown in the figure) for achieving electrical connection between at least two battery cells 100 .

[0068] Of course, in some embodiments, the battery 1 may not include the box body 200, but at least two battery cells 10 are electrically connected and formed into a whole through necessary fixing structures and then assembled into an electrical device.

[0069] See also Figure 3 , Figure 4 , Figure 3 A front view of a battery cell 10 provided in some embodiments of the present application, Figure 4 for Figure 3 A cross-sectional view along AA is provided. The battery cell 10 is the smallest unit for storing and outputting electric energy. The battery cell 10 includes a housing 11, an electrode terminal 12, a switching member 13, an electrode assembly 15, an electrolyte (not shown in the figure), and other components.

[0070] The outer shell 11 is a component that isolates the internal environment of the battery cell 10 from the external environment. The outer shell 11 may include a shell 111 and an end cover 112. The end cover 112 is a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 10 from the external environment. In some embodiments, the shape of the end cover 112 can be adapted to the shape of the shell 111 to match the shell 111. In some embodiments, the end cover 112 can be made of a material with a certain hardness and strength, so that the end cover 112 is not easily deformed when squeezed and collided, so that the battery cell 10 can have a higher structural strength and the safety performance can also be improved. Among them, the material of the end cover 112 can be diversified, and the end cover 112 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic and other materials.

[0071] The shell 111 is a component used to cooperate with the end cap 112 to form the internal environment of the battery cell 10. The internal environment formed by the shell 111 and the end cap 112 can be used to accommodate the electrode assembly 15, electrolyte and other components. In some embodiments, the shell 111 and the end cap 112 can be independent components, and an opening can be set on the shell 111, and the end cap 112 is made to cover the opening at the opening to form the internal environment of the battery cell 10. In some embodiments, the end cap 112 and the shell 111 can also be integrated. Specifically, the end cap 112 and the shell 111 can form a common connection surface before other components are put into the shell. When it is necessary to encapsulate the interior of the shell 111, the end cap 112 is made to cover the shell 111. Among them, the shell 111 can be of various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. The shape of the shell 111 can be determined according to the specific shape and size of the electrode assembly 15. The material of the housing 111 can be varied, and the housing 111 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and other materials.

[0072] The electrode assembly 15 is a component in the battery cell 10 where an electrochemical reaction occurs. The housing 11 may include one or at least two electrode assemblies 15. The electrode assembly 15 includes a positive electrode sheet (not shown in the figure), a negative electrode sheet (not shown in the figure) and a separator (not shown in the figure), which separates the positive electrode sheet from the negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet can be processed by winding, stacking or other methods to form the electrode assembly 15. In the electrode assembly 15, the parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 151 of the electrode assembly 15, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear 152, which is the current transmission end of the electrode assembly 15 for transmitting current. The tab 152 of the positive electrode sheet is the positive electrode tab 152 a , and the tab 152 of the negative electrode sheet is the negative electrode tab 152 b . The positive electrode tab 152 a and the negative electrode tab 152 b may be located together at one end of the electrode body 151 or respectively at both ends of the electrode body 151 .

[0073] The electrolyte is the liquid that soaks the electrode assembly 15. The battery cell 10 mainly relies on the movement of active ions between the positive electrode plate and the negative electrode plate to work. When the battery cell 10 is charged, the positive electrode plate will generate active ions, and the active ions provided by the positive electrode plate can penetrate the pores of the diaphragm, move to the negative electrode plate via the electrolyte, and embed into the negative active material of the negative electrode plate. Conversely, when the battery cell 10 is discharged, the active ions embedded in the negative active material of the negative electrode plate escape, and the active ions escaped from the negative electrode plate can penetrate the pores of the diaphragm, move to the positive electrode plate via the electrolyte, and embed into the positive active material of the positive electrode plate. Among them, the active ions can be lithium ions, sodium ions, and the like.

[0074] The electrode terminal 12 is a component electrically connected to the electrode assembly 15 and used to output or input electrical energy. The electrode terminal 12 includes a positive electrode terminal 12a and a negative electrode terminal 12b. The positive electrode terminal 12a is electrically connected to the positive electrode tab 152a of the electrode assembly 15. The negative electrode terminal 12b is electrically connected to the negative electrode tab 152b of the electrode assembly 15. The electrode terminal 12 can be installed in the housing 11 and stabilize the installation position and installation state relative to the housing 11. In some embodiments, the electrode terminal 12 can be installed in the housing 11 by flanging and riveting. In some embodiments, an insulating structure 14 is provided at the area where the electrode terminal 12 and the housing 11 match, and the insulating structure 14 has insulating properties, which can insulate the electrode terminal 12 and the housing 11 from each other to reduce the risk of short circuit. Optionally, the insulating structure 14 may include plastic, rubber, etc.

[0075] The adapter 13 is a current collecting member electrically connected between the pole ear 152 of the electrode assembly 15 and the corresponding electrode terminal 12. The adapter 13 may also be referred to as an adapter connector, a current collecting plate or an adapter sheet, etc. The adapter 13 has a conductive property and is made of a conductive material. The material of the adapter 13 may include aluminum, aluminum alloy, copper, copper alloy, copper-aluminum alloy, etc. The adapter 13 includes a positive electrode adapter 13a and a negative electrode adapter 13b. The positive pole ear 152a of the electrode assembly 15 can be electrically connected to the positive electrode terminal 12a through the positive electrode adapter 13a, and the negative pole ear 152b of the electrode assembly 15 can be electrically connected to the negative electrode terminal 12b through the negative electrode adapter 13b to form a current loop. In some embodiments, the adapter 13 can be connected to the pole ear 152 of the electrode assembly 15 by welding, abutment, etc. The adapter 13 can be connected to the electrode terminal 12 by welding, abutment, etc. The shape of the adapter 13 can be various, such as square, round, special-shaped, etc.

[0076] In some embodiments, the housing 11 may also be provided with a pressure relief mechanism (not shown in the figure) for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value.

[0077] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 Some embodiments of the present application provide a battery cell 10, which includes an electrode assembly 15, an electrode terminal 12, and an adapter 13. The electrode terminal 12 is provided with a through hole 121. The adapter 13 is electrically connected between the electrode terminal 12 and the electrode assembly 15. The adapter 13 is provided with a convex portion 131 on the side facing the electrode terminal 12, and the convex portion 131 is inserted into the through hole 121. One of the outer peripheral surface of the convex portion 131 and the hole wall of the through hole 121 is provided with a groove 1311, and the other one is provided with a protrusion 1211 that is snap-fitted with the groove 1311.

[0078] It should be noted that the electrode assembly 15 is a component in the battery cell 10 where an electrochemical reaction occurs. The electrode assembly 15 is accommodated in the internal space of the battery cell 10. The battery cell 10 may be provided with one or at least two electrode assemblies 15. In addition, other related descriptions of the electrode assembly 15 can be referred to above, and will not be repeated here.

[0079] It should also be noted that the electrode terminal 12 is an electrical connection component between the battery cell 10 and external components, and is used to output or input electrical energy. The electrode terminal 12 can be installed on any wall portion of the outer shell 11 of the battery cell 10. The electrode terminal 12 can be partially exposed outside the battery cell 10. A through hole 121 is opened at one end of the electrode terminal 12 along its axial direction, and the through hole 121 passes through to the other end of the electrode terminal 12 along its axial direction, that is, the through hole 121 passes through the electrode terminal 12. Among them, the through hole 121 can be but is not limited to a circular hole, a rectangular hole, etc. Among them, the axial direction of the electrode terminal 12 is the extension direction of the center line of the electrode terminal 12, that is, the axial direction of the electrode terminal 12 is parallel to the center line of the electrode terminal 12. In addition, other relevant descriptions of the electrode terminal 12 can be found in the previous text, which will not be repeated here.

[0080] It should also be noted that the adapter 13 is a current collecting component electrically connected between the pole ear 152 of the electrode assembly 15 and the corresponding electrode terminal 12. The adapter 13 can also be called a transfer connector, a current collecting plate or a transfer sheet. The adapter 13 has a conductive property and is made of a conductive material. In some embodiments, the adapter 13 can be connected to the pole ear 152 of the electrode assembly 15 by welding, abutment, etc.

[0081] The adapter 13 is provided with a convex portion 131 on one side facing the electrode terminal 12. The shape of the convex portion 131 is the same as the shape of the through hole 121. The size of the convex portion 131 is adapted to or slightly smaller than the size of the through hole 121. The convex portion 131 is inserted into the through hole 121. When the convex portion 131 is inserted into the through hole 121, a mechanical connection relationship and an electrical connection relationship can be initially established between the adapter 13 and the electrode terminal 12. On this basis, the convex portion 131 and the electrode terminal 12 can be welded on the outside of the electrode terminal 12 (i.e., on the side corresponding to the outside of the battery cell 10) to stabilize the mechanical connection relationship and the electrical connection relationship between the adapter 13 and the electrode terminal 12. In addition, since the welding operation of the convex portion 131 and the electrode terminal 12 is performed on the outside of the electrode terminal 12, most of the metal particles generated during welding can be blocked on the outside of the electrode terminal 12, thereby preliminarily reducing the risk of most of the metal particles generated during welding remaining inside the battery cell 10, and preliminarily maintaining the electrical performance inside the battery cell 10.

[0082] In addition, other related descriptions of the adapter 13 can be found in the above text and will not be repeated here.

[0083] It should also be noted that if Figure 5 , Figure 6 As shown, in some embodiments, the outer peripheral surface of the convex portion 131 is provided with a groove 1311, and the hole wall of the through hole 121 is provided with a protrusion 1211. When the convex portion 131 is inserted into the through hole 121, the protrusion 1211 is buckled and matched in the groove 1311. Figure 7 , Figure 8 As shown, in other embodiments, the hole wall of the through hole 121 is provided with a groove 1311, and the outer peripheral surface of the convex part 131 is provided with a protrusion 1211. When the convex part 131 is inserted into the through hole 121, the protrusion 1211 is buckled and matched in the groove 1311. Among them, the protrusion 1211 can be, but is not limited to, a dot-shaped protrusion, a strip-shaped protrusion, etc. Among them, the matching groove 1311 and protrusion 1211 are a group, and the groove 1311 and the protrusion 1211 can be provided in one or more groups.

[0084] Based on this, when the convex portion 131 is inserted into the through hole 121, the convex portion 131 and the through hole 121 can also be snap-fitted through the convex portion 1211 and the groove 1311. Therefore, on the one hand, the connection reliability and connection strength between the adapter 13 and the electrode terminal 12 can be enhanced through the snap-fitting of the convex portion 1211 and the groove 1311. On the other hand, the gap between the convex portion 131 and the through hole 121 can be blocked in the connection area of ​​the convex portion 1211 and the groove 1311 through the convex portion 1211, thereby reducing the risk of metal particles generated during welding from these gaps sputtering into the interior of the battery cell 10.

[0085] In summary, the battery cell 10 provided in the embodiment of the present application can facilitate the preliminary establishment of a reliable mechanical connection relationship and electrical connection relationship between the adapter 13 and the electrode terminal 12 by inserting the protrusion 131 of the adapter 13 into the through hole 121 of the electrode terminal 12, and making the protrusion 131 and the through hole 121 snap-fit ​​via the protrusion 1211 and the groove 1311, and effectively block the gap between the protrusion 131 and the through hole 121 via the protrusion 1211 in the connection area between the protrusion 1211 and the groove 1311. Based on this, it is convenient to weld the protrusion 131 and the electrode terminal 12 from the outside of the electrode terminal 12, which can improve the welding convenience, welding quality, and welding yield, and can improve the connection convenience, connection reliability, and connection strength of the mechanical connection and electrical connection between the adapter 13 and the electrode terminal 12. Furthermore, during the welding operation of the protrusion 131 and the electrode terminal 12, most of the metal particles generated during the welding can be blocked on the outside of the electrode terminal 12. In particular, the protrusion 1211 can prevent the metal particles from sputtering from the gap between the protrusion 131 and the through hole 121 into the battery cell 10. This can reduce the risk of the metal particles generated during the welding being sputtered and remaining in the battery cell 10, reduce the risk of the metal particles generated during the welding adversely affecting the electrical properties inside the battery cell 10, and maintain and optimize the electrical properties inside the battery cell 10.

[0086] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 In some embodiments of the present application, the protrusion 1211 is a strip-shaped protrusion.

[0087] It should be noted that the protrusion 1211 is a continuously extending strip-shaped protrusion. The strip-shaped protrusion can be extended in a straight line or in a curve. The extension direction of the strip-shaped protrusion can be flexible and designed as needed. The strip-shaped protrusion can be, but is not limited to, extended along the circumference of the convex portion 131.

[0088] By adopting the above scheme, compared with point-like protrusions or other intermittent protrusions, by making the protrusion 1211 a continuously extended strip-like protrusion, the protrusion 1211 can be enabled to form continuous and more contact points and contact areas with the groove 1311, thereby improving the connection stability and connection reliability between the protrusion 1211 and the groove 1311, and enabling the protrusion 1211 to provide a linear, continuous, wider and reliable blocking range, and optimizing the blocking effect of the protrusion 1211 on the gap between the protrusion 131 and the through hole 121, thereby reducing the risk of metal particles sputtering from the gap between the protrusion 131 and the through hole 121 into the battery cell 10, and maintaining and optimizing the electrical performance inside the battery cell 10.

[0089] Of course, in other embodiments, the protrusions 1211 may be discontinuous protrusions 1211 , such as dot-shaped protrusions and the like.

[0090] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 In some embodiments of the present application, the protrusion 1211 is an annular protrusion.

[0091] It should be noted that the protrusion 1211 is an annular protrusion, for example, it can be in a closed ring shape, an open ring shape, etc. The circumferential direction of the protrusion 1211 can intersect with the axial direction z of the protrusion 131, or it can be parallel to the axial direction z of the protrusion 131. Among them, the axial direction z of the protrusion 131 is the extension direction of the center line of the protrusion 131, that is, the axial direction z of the protrusion 131 is parallel to the center line of the protrusion 131. When the protrusion 131 is inserted into the through hole 121, the axial direction z of the protrusion 131 is parallel to the axial direction of the electrode terminal 12. The circumferential direction of the protrusion 131 refers to the circumferential direction of the ring formed by the outer peripheral surface of the protrusion 131.

[0092] By adopting the above solution, by making the protrusion 1211 an annular protrusion, the protrusion 1211 can form more contact points and a larger contact area with the groove 1311, which can improve the connection stability and connection reliability between the protrusion 1211 and the groove 1311. In addition, the protrusion 1211 can occupy a certain range in the circumferential direction of the protrusion 131, and the protrusion 1211 can form a continuous and wide blocking range in the circumferential direction of the protrusion 131, which can optimize the blocking effect of the protrusion 1211 on the gap between the protrusion 131 and the through hole 121, thereby reducing the risk of metal particles sputtering from the gap between the protrusion 131 and the through hole 121 into the battery cell 10, and maintaining and optimizing the electrical performance inside the battery cell 10.

[0093] Of course, in other embodiments, the protrusion 1211 may be a linear protrusion or the like.

[0094] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 In some embodiments of the present application, the protrusion 1211 is in a closed ring shape. That is, the protrusion 1211 is a closed ring-shaped annular protrusion.

[0095] By adopting the above solution, by making the protrusion 1211 in a closed ring shape, based on the characteristic that the ring has no obvious starting point and end point, the protrusion 1211 can form evenly distributed contact points and contact areas with the groove 1311, thereby improving the connection stability and connection reliability between the protrusion 1211 and the groove 1311. In addition, the protrusion 1211 in a closed ring shape can provide complete sealing and blocking properties in the ring range, and the protrusion 1211 can block the gap between the protrusion 131 and the through hole 121 to a greater extent and a larger range, thereby reducing the risk of metal particles sputtering from the gap between the protrusion 131 and the through hole 121 into the battery cell 10, and maintaining and optimizing the electrical performance inside the battery cell 10.

[0096] Of course, in other embodiments, the protrusion 1211 may be in the shape of an open ring.

[0097] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 In some embodiments of the present application, the circumferential direction of the protrusion 1211 intersects with the axial direction z of the convex portion 131 .

[0098] It should be noted that, when the protrusion 1211 is an annular protrusion, especially when the protrusion 1211 is in a closed ring shape, the circumferential direction of the protrusion 1211 may intersect (eg, be perpendicular to) the axial direction z of the convex portion 131 .

[0099] In some embodiments, the circumferential direction of the protrusion 1211 is perpendicular to the axial direction z of the protrusion 131. Such a configuration can simplify the alignment steps of the protrusion 1211 and the groove 1311 during the plug-in assembly of the protrusion 131 and the through hole 121, making it easier for the various parts of the protrusion 1211 to be synchronously snapped into the groove 1311, thereby improving the connection convenience and reliability between the protrusion 131 and the through hole 121, and facilitating the assembly between the adapter 13 and the electrode terminal 12.

[0100] By adopting the above solution, by making the circumferential direction of the protrusion 1211 intersect with the axial direction z of the convex portion 131, the protrusion 1211 can be extended to a larger range in the circumferential direction of the convex portion 131, and the protrusion 1211 can be prompted to form a continuous and wide blocking range in the circumferential direction of the convex portion 131. In particular, when the protrusion 1211 is in a closed ring shape, the protrusion 1211 can be prompted to form a continuous and comprehensive blocking range in the circumferential direction of the convex portion 131, and the protrusion 1211 can be enabled to fully block the gap in the entire circumferential direction of the convex portion 131. In this way, the blocking effect of the protrusion 1211 on the gap between the convex portion 131 and the through hole 121 can be optimized, the risk of metal particles splashing from the gap between the convex portion 131 and the through hole 121 into the battery cell 10 can be reduced, and the electrical performance inside the battery cell 10 can be maintained and optimized.

[0101] Of course, in other embodiments, the circumferential direction of the protrusion 1211 may be parallel to the axial direction z of the convex portion 131 .

[0102] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 In some embodiments of the present application, the width of the protrusion 1211 is gradually reduced in the direction approaching the bottom of the groove 1311 .

[0103] It should be noted that if Figure 5 , Figure 6 As shown, in some embodiments, the outer peripheral surface of the convex portion 131 is provided with a groove 1311, and the hole wall of the through hole 121 is provided with a protrusion 1211. When the convex portion 131 is inserted into the through hole 121, the protrusion 1211 is snap-fitted into the groove 1311. In this case, the width of the protrusion 1211 is gradually reduced in the direction close to the bottom of the groove 1311, that is, the width of the protrusion 1211 is gradually reduced in the direction away from the hole wall of the through hole 121.

[0104] like Figure 7 , Figure 8 As shown, in other embodiments, the hole wall of the through hole 121 is provided with a groove 1311, and the outer peripheral surface of the convex part 131 is provided with a protrusion 1211. When the convex part 131 is inserted into the through hole 121, the protrusion 1211 is snap-fitted into the groove 1311. In this case, the width of the protrusion 1211 is gradually reduced in the direction close to the bottom of the groove 1311, that is, the width of the protrusion 1211 is gradually reduced in the direction away from the outer peripheral surface of the convex part 131.

[0105] The width of the protrusion 1211 refers to the dimension of the protrusion 1211 in the axial direction z of the convex portion 131 .

[0106] By adopting the above scheme, by making the width of the protrusion 1211 gradually shrink in the direction close to the bottom of the groove 1311, the resistance of the protrusion 1211 inserted into the groove 1311 can be reduced during the assembly of the protrusion 1211 and the groove 1311, so that the protrusion 1211 can be easily and quickly inserted into the groove 1311, thereby facilitating the assembly of the protrusion 1211 and the groove 1311, and improving the assembly convenience and assembly efficiency between the convex part 131 and the through hole 121 (especially between the protrusion 1211 and the groove 1311). In addition, due to the gradual change of the width of the protrusion 1211, the protrusion 1211 and the groove 1311 can be adaptively compensated for the tolerance in the assembly during the cooperation, and realize the adaptive tightness and reliable cooperation, thereby improving the reliability and stability of the buckle cooperation between the protrusion 1211 and the groove 1311.

[0107] Of course, in other embodiments, the width of the protrusion 1211 in the direction close to the bottom of the groove 1311 can be set to be the same.

[0108] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 In some embodiments of the present application, the protrusion 1211 has a fixing surface 12111 and a guiding surface 12112. The fixing surface 12111 is arranged on the side of the protrusion 1211 away from the groove 1311. The guiding surface 12112 is arranged opposite to the groove wall of the groove 1311. The guiding surface 12112 is obliquely connected to the fixing surface 12111, and the angle α formed between the guiding surface 12112 and the fixing surface 12111 is an acute angle.

[0109] It should be noted that the fixing surface 12111 is disposed on the side of the protrusion 1211 away from the groove 1311, and is the surface used by the protrusion 1211 to fix itself. Figure 5 , Figure 6 As shown, in some embodiments, the hole wall of the through hole 121 is provided with a protrusion 1211, and the fixing surface 12111 is the surface of the protrusion 1211 that overlaps with the hole wall of the through hole 121. Figure 7 , Figure 8 As shown, in some other embodiments, the outer peripheral surface of the convex portion 131 is provided with a protrusion 1211 , and the fixing surface 12111 is a surface of the protrusion 1211 that overlaps with the outer peripheral surface of the convex portion 131 .

[0110] The guide surface 12112 is provided on the side of the protrusion 1211 facing the groove 1311, and is the surface of the protrusion 1211 used to be arranged opposite to the groove wall of the groove 1311. The guide surface 12112 may be, but is not limited to, a plane, a curved surface, etc. There may be at least one guide surface 12112. In some embodiments, there are two guide surfaces 12112, the two guide surfaces 12112 are arranged opposite to each other along the axial direction z of the protrusion 131, and the two guide surfaces 12112 are arranged opposite to the two groove walls of the groove 1311 one by one.

[0111] The guide surface 12112 is connected to the fixed surface 12111 obliquely, that is, the guide surface 12112 is connected to the fixed surface 12111 and is arranged at an angle α. The angle α formed between the guide surface 12112 and the fixed surface 12111 is an acute angle.

[0112] By adopting the above scheme, when the hole wall of the through hole 121 is provided with a protrusion 1211, during the assembly of the protrusion 131 and the through hole 121, the guide surface 12112 obliquely connected to the fixing surface 12111 can guide the part of the protrusion 131 away from the electrode assembly 15 to easily and quickly pass over the protrusion 1211, and can guide the protrusion 1211 to be easily and quickly inserted into the groove 1311, which can reduce the assembly friction and assembly resistance of the protrusion 1211, thereby facilitating assembly, and improving the assembly convenience and efficiency between the protrusion 131 and the through hole 121 (especially between the protrusion 1211 and the groove 1311).

[0113] Similarly, when the protrusion 1211 is provided on the outer peripheral surface of the protrusion 131, during the assembly of the protrusion 131 and the through hole 121, the portion of the protrusion 131 provided with the protrusion 1211 can be guided to easily and quickly enter the through hole 121 through the guide surface 12112 obliquely connected to the fixing surface 12111, and the protrusion 1211 can be easily and quickly inserted into the groove 1311, which can reduce the assembly friction and assembly resistance of the protrusion 1211, thereby facilitating assembly and improving the assembly convenience and efficiency between the protrusion 131 and the through hole 121 (especially between the protrusion 1211 and the groove 1311).

[0114] Furthermore, while the protrusion 1211 is engaged with the groove 1311 , the guide surface 12112 and the groove wall of the groove 1311 can adaptively compensate for the assembly tolerance and achieve a snug fit, thereby improving the reliability and stability of the fit between the protrusion 1211 and the groove 1311 .

[0115] Of course, in other embodiments, the angle α formed between the guide surface 12112 and the fixing surface 12111 may be a right angle.

[0116] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 In some embodiments of the present application, the angle α formed between the guide surface 12112 and the fixing surface 12111 is 5° to 30°.

[0117] It should be noted that the guide surface 12112 is obliquely connected to the fixed surface 12111, and the angle α formed between the guide surface 12112 and the fixed surface 12111 is an acute angle, and the angle value of the angle α is 5° to 30°. For example, the angle value of the angle α can be 5°, 10°, 15°, 20°, 25°, 30°, etc.

[0118] By adopting the above scheme, by making the angle α formed between the guide surface 12112 and the fixed surface 12111 be 5° to 30°, on the one hand, the smoothness of the plug-in fit between the protrusion 131 and the through hole 121 (especially between the protrusion 1211 and the groove 1311) can be improved, the assembly resistance and the assembly friction can be reduced, and the assembly convenience and efficiency between the protrusion 131 and the through hole 121 (especially between the protrusion 1211 and the groove 1311) can be improved. On the other hand, the guiding surface 12112 of the protrusion 1211 can fit snugly with the groove wall of the groove 1311, and a moderate fitting pressure can be formed between the protrusion 1211 and the groove 1311, especially a moderate fitting pressure can be formed between the guiding surface 12112 and the groove wall of the groove 1311, thereby forming a better assembly effect between the protrusion 1211 and the groove 1311 and improving the reliability of the snap-fit ​​between the protrusion 1211 and the groove 1311.

[0119] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 In some embodiments of the present application, on any longitudinal cross-section of the protrusion 131 and the through hole 121, the maximum radial dimension of the protrusion 131 is D1, and the minimum radial dimension of the through hole 121 is D2. ε is calculated by (D1-D2) / D1, and ε is configured as: 0≤ε≤3.5%.

[0120] It should be noted that the through hole 121 may be a circular hole or a non-circular hole (such as a rectangular hole, etc.). The shape of the convex portion 131 is the same as that of the through hole 121. Regardless of the shapes of the through hole 121 and the convex portion 131, the longitudinal sections of the convex portion 131 and the through hole 121 pass through the center line of the through hole 121 and are parallel to the axial direction z of the convex portion 131.

[0121] On any longitudinal section of the convex portion 131 and the through hole 121: the radial direction of the convex portion 131 passes through the center line of the convex portion 131 and is perpendicular to the center line, the radial dimension of the convex portion 131 is the dimension of the convex portion 131 in its radial direction, and the maximum radial dimension D1 of the convex portion 131 is the largest of the radial dimensions of the convex portion 131 in the section. The radial direction of the through hole 121 passes through the center line of the through hole 121 and is perpendicular to the center line, the radial dimension of the through hole 121 is the dimension of the through hole 121 in its radial direction, and the minimum radial dimension D2 of the through hole 121 is the smallest of the radial dimensions of the through hole 121 in the section.

[0122] ε can be calculated by (D1-D2) / D1. ε can reflect the potential reduction degree of the maximum radial dimension D1 of the protrusion 131 during the assembly process. The potential reduction degree is the possible deformation risk, which does not mean that the maximum radial dimension D1 of the protrusion 131 will definitely produce this degree of reduction deformation during the actual assembly process.

[0123] like Figure 5 , Figure 6 As shown, in some embodiments, the hole wall of the through hole 121 is provided with a protrusion 1211, and the outer peripheral surface of the protrusion 131 is provided with a groove 1311. In this case, on any longitudinal section of the protrusion 131 and the through hole 121, the maximum radial dimension D1 of the protrusion 131 is the radial dimension of the portion of the protrusion 131 that is not provided with the groove 1311, and the minimum radial dimension D2 of the through hole 121 is the radial dimension of the through hole 121 at the convex point of the protrusion 1211 (i.e., the position closest to the bottom of the groove 1311). During the assembly process, the portion of the protrusion 131 away from the electrode assembly 15 will be squeezed with the protrusion 1211 when passing through the protrusion 1211, resulting in the portion of the protrusion 131 away from the electrode assembly 15 and the protrusion 1211 may be deformed due to mutual squeezing. In this case, ε calculated by (D1-D2) / D1 can reflect the potential reduction degree of the radial dimension of the portion of the protrusion 131 away from the electrode assembly 15.

[0124] Therefore, by adopting the above scheme, in the case where the hole wall of the through hole 121 is provided with a protrusion 1211, ε can be calculated by (D1-D2) / D1 to reflect the potential reduction degree of the radial dimension of the portion of the protrusion 131 away from the electrode assembly 15 (i.e., the portion that needs to cross the protrusion 1211) through ε. And by making 0≤ε≤3.5%, the potential reduction degree of the radial dimension of the portion of the protrusion 131 away from the electrode assembly 15 is limited, so that the risk of shrinking and deforming of the portion of the protrusion 131 away from the electrode assembly 15 is small. Based on this, the risk of the portion of the protrusion 131 away from the electrode assembly 15 increasing the gap between the through hole 121 due to shrinkage and deformation can be reduced, so that the welding between the protrusion 131 and the electrode terminal 12 can be facilitated, the welding yield can be improved, and the risk of metal particles generated during welding from the gap between the protrusion 131 and the through hole 121 to the battery cell 10 can be reduced. Therefore, this embodiment is more suitable for the situation that “the hole wall of the through hole 121 is provided with a protrusion 1211, and the outer peripheral surface of the protrusion 131 is provided with a groove 1311”.

[0125] like Figure 7 , Figure 8As shown, in other embodiments, the outer peripheral surface of the convex portion 131 is provided with a protrusion 1211, and the hole wall of the through hole 121 is provided with a groove 1311. In this case, on any longitudinal section of the convex portion 131 and the through hole 121, the maximum radial dimension D1 of the convex portion 131 is the radial dimension of the convex portion 131 at the convex point of the protrusion 1211 (i.e., the position closest to the bottom of the groove 1311), and the minimum radial dimension D2 of the through hole 121 is the radial dimension of the portion of the through hole 121 that is not provided with the groove 1311. During the assembly process, when the portion of the convex portion 131 provided with the protrusion 1211 enters the through hole 121, it will be squeezed against the portion of the through hole 121 that is not provided with the groove 1311, resulting in the portion of the convex portion 131 provided with the protrusion 1211 and the portion of the through hole 121 that is not provided with the groove 1311 may be deformed due to mutual squeezing. In this case, ε calculated by (D1-D2) / D1 can reflect the potential reduction degree of the radial dimension of the convex portion 131 at the convex point of the protrusion 1211.

[0126] Therefore, by adopting the above scheme, when the outer peripheral surface of the convex portion 131 is provided with the protrusion 1211, ε can be calculated by (D1-D2) / D1 to reflect the potential reduction degree of the radial dimension of the convex point of the convex portion 131 corresponding to the protrusion 1211 through ε. And by making 0≤ε≤3.5%, the potential shrinkage deformation risk of the convex point of the convex portion 131 corresponding to the protrusion 1211 can be limited. Based on this, the risk of the convex point of the convex portion 131 corresponding to the protrusion 1211 from entering the through hole 121 to matching with the groove 1311 can be reduced, and the risk of the convex point of the convex portion 131 corresponding to the protrusion 1211 being poorly matched with the groove 1311 due to shrinkage deformation can be reduced, so that the blocking effect of the protrusion 1211 can be achieved as expected, and the risk of metal particles generated during welding from the gap between the convex portion 131 and the through hole 121 to splash into the battery cell 10 can be reduced.

[0127] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 In some embodiments of the present application, the cross-sectional shape of the protrusion 1211 is trapezoidal, arched or fan-shaped, and the cross-sectional shape of the protrusion 1211 is parallel to the axial direction z of the convex portion 131 .

[0128] It should be noted that, when the hole wall of the through hole 121 is provided with a protrusion 1211, the cross section of the protrusion 1211 is parallel to the axial direction of the electrode terminal 12. When the outer peripheral surface of the protrusion 131 is provided with a protrusion 1211, the cross section of the protrusion 1211 is parallel to the axial direction z of the protrusion 131. When the protrusion 131 is inserted into the through hole 121, the axial direction z of the protrusion 131 is parallel to the axial direction of the electrode terminal 12.

[0129] The cross-section of the protrusion 1211 is in the shape of a trapezoid, an arc or a fan. The trapezoid includes an isosceles trapezoid, a right-angle trapezoid, etc. The arc includes a chord and a convex arc connected end to end. The fan includes a semicircle, etc.

[0130] By adopting the above scheme, by making the cross-sectional shape of the protrusion 1211 trapezoidal, arched or fan-shaped, on the one hand, the shape of the protrusion 1211 can be regularized to facilitate the processing and forming of the protrusion 1211. On the one hand, the blocking effect of the protrusion 1211 can be optimized, so that the protrusion 1211 blocks the gap between the protrusion 131 and the through hole 121, and reduces the risk of metal particles generated during welding from the gap between the protrusion 131 and the through hole 121 to splash into the battery cell 10. On the one hand, during the assembly of the protrusion 131 and the through hole 121, the protrusion 1211 can be easily and quickly inserted into the groove 1311 through the trapezoidal inclined surface, the arched curved surface, and the fan-shaped curved surface, thereby reducing the assembly friction and assembly resistance of the protrusion 1211, facilitating assembly, and improving the assembly convenience and assembly efficiency between the protrusion 131 and the through hole 121 (especially between the protrusion 1211 and the groove 1311).

[0131] Of course, in other embodiments, the cross-sectional shape of the protrusion 1211 may be other shapes, such as a rectangle.

[0132] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 In some embodiments of the present application, the cross-sectional shape of the protrusion 131 is circular, and the cross-sectional shape of the protrusion 131 is perpendicular to the axial direction z of the protrusion 131 .

[0133] It should be noted that the cross section of the protrusion 131 is perpendicular to the axial direction z of the protrusion 131. The cross section of the through hole 121 is perpendicular to the axial direction of the electrode terminal 12. When the protrusion 131 is inserted into the through hole 121, the axial direction z of the protrusion 131 is parallel to the axial direction of the electrode terminal 12. The cross section of the protrusion 131 is circular, and correspondingly, the cross section of the through hole 121 is also circular.

[0134] By adopting the above solution, by making the cross-sectional shape of the protrusion 131 circular, the cross-sectional shape of the through hole 121 can also be correspondingly circular. Based on this, the protrusion 131 can be quickly and conveniently inserted into the through hole 121 without excessive alignment or positioning, thereby simplifying the assembly process and improving the flexibility, convenience and efficiency of assembly.

[0135] See also Figure 5 , Figure 6 , Figure 7 , Figure 8In summary, the present application provides a specific example of a battery cell 10 according to some of the above embodiments. The battery cell 10 includes an electrode assembly 15, an electrode terminal 12 and a transition piece 13. The transition piece 13 is electrically connected between the electrode terminal 12 and the electrode assembly 15.

[0136] The electrode terminal 12 is provided with a through hole 121, and the cross-section of the through hole 121 perpendicular to the axial direction of the electrode terminal 12 is circular. The adapter 13 is provided with a protrusion 131 on the side facing the electrode terminal 12. The cross-section of the protrusion 131 perpendicular to its axial direction is circular. Based on this, the protrusion 131 can be quickly and conveniently inserted into the through hole 121 without too much alignment or positioning, thereby simplifying the assembly process and improving the flexibility, convenience and efficiency of assembly. Among them, when the protrusion 131 is inserted into the through hole 121, the axial direction of the electrode terminal 12 is parallel to the axial direction z of the protrusion 131.

[0137] The outer peripheral surface of the convex part 131 is provided with a groove 1311, and the hole wall of the through hole 121 is provided with a protrusion 1211. When the convex part 131 is inserted into the through hole 121, the protrusion 1211 is snap-fitted into the groove 1311. The protrusion 1211 is a closed ring-shaped annular protrusion, and the circumferential direction of the protrusion 1211 is perpendicular to the axial direction z of the convex part 131.

[0138] Based on this, it is convenient to weld the protrusion 131 and the electrode terminal 12 from the outside of the electrode terminal 12, which can improve the welding convenience, welding quality, and welding yield, and can improve the connection convenience, connection reliability, and connection strength of the mechanical connection and electrical connection between the adapter 13 and the electrode terminal 12. In addition, during the welding operation of the protrusion 131 and the electrode terminal 12, most of the metal particles generated during the welding can be blocked on the outside of the electrode terminal 12, especially through the protrusion 1211 that surrounds the circumference of the protrusion 131, the metal particles can be blocked from being splashed from the gap between the protrusion 131 and the through hole 121 to the battery cell 10 in all directions, thereby reducing the risk of the metal particles generated during the welding being splashed and left in the battery cell 10, reducing the risk of the metal particles generated during the welding having an adverse effect on the electrical properties inside the battery 1, and maintaining and optimizing the electrical properties inside the battery cell 10.

[0139] In the direction close to the bottom of the groove 1311, the width of the protrusion 1211 is gradually reduced. The cross-section of the protrusion 1211 parallel to the axial direction of the convex portion 131 is trapezoidal in shape. The protrusion 1211 has a fixing surface 12111 and a guide surface 12112. The fixing surface 12111 is arranged on the side of the protrusion 1211 away from the groove 1311, and is used to overlap with the hole wall of the through hole 121. The guide surface 12112 is arranged on the side of the protrusion 1211 facing the groove 1311, and is used to be arranged opposite to the groove wall of the groove 1311. The guide surface 12112 is obliquely connected to the fixing surface 12111, and the angle value of the angle α formed between the guide surface 12112 and the fixing surface 12111 is 5° to 30°.

[0140] Based on this, during the assembly of the protrusion 131 and the through hole 121, the guide surface 12112 connected obliquely to the fixing surface 12111 can guide the portion of the protrusion 131 away from the electrode assembly 15 to easily and quickly pass over the protrusion 1211, and can guide the protrusion 1211 to easily and quickly insert into the groove 1311, which can reduce the assembly friction and assembly resistance of the protrusion 1211, thereby facilitating assembly, and improving the assembly convenience and assembly efficiency between the protrusion 131 and the through hole 121 (especially between the protrusion 1211 and the groove 1311). In addition, during the period when the protrusion 1211 is matched with the groove 1311, the guide surface 12112 and the groove wall of the groove 1311 can adaptively compensate for the assembly tolerance, can achieve a close fit, and can form a moderate fit pressure, thereby improving the reliability and stability of the fit between the protrusion 1211 and the groove 1311.

[0141] In any longitudinal section of the protrusion 131 and the through hole 121 , the maximum radial dimension of the protrusion 131 is D1 , the minimum radial dimension of the through hole 121 is D2 , and ε is calculated by (D1 - D2) / D1 , and ε is configured as: 0≤ε≤3.5%.

[0142] Based on this, the potential reduction degree of the radial dimension of the portion of the protrusion 131 away from the electrode assembly 15 (i.e., the portion that needs to cross the protrusion 1211) can be reflected through ε. And by setting 0≤ε≤3.5%, the potential reduction degree of the radial dimension of the portion of the protrusion 131 away from the electrode assembly 15 is limited, so that the risk of shrinking and deforming of the portion of the protrusion 131 away from the electrode assembly 15 is small. In this way, the risk of the portion of the protrusion 131 away from the electrode assembly 15 increasing the gap between the through hole 121 due to shrinkage and deformation can be reduced, so that the welding between the protrusion 131 and the electrode terminal 12 can be facilitated, the welding yield can be improved, and the risk of metal particles generated during welding from the gap between the protrusion 131 and the through hole 121 sputtering into the battery cell 10 can be reduced.

[0143] See also Figure 2 , Figure 3Some embodiments of the present application provide a battery 1, and the battery 1 includes a battery cell 10 provided in an embodiment of the present application.

[0144] By adopting the above solution, the battery 1 can optimize the electrical performance and use reliability of the battery 1 by applying the battery cell 10 provided in the embodiment of the present application.

[0145] See also Figure 1 , Figure 3 Some embodiments of the present application provide an electrical device, which includes a battery 1 provided in an embodiment of the present application, or a battery cell 10 provided in an embodiment of the present application.

[0146] By adopting the above solution, the performance of the electrical device can be optimized by applying the battery 1 or the battery cell 10 provided in the embodiment of the present application.

[0147] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: The battery cell comprises: Electrode assembly; An electrode terminal, wherein the electrode terminal is provided with a through hole; An adapter is electrically connected between the electrode terminal and the electrode assembly, and a convex portion is provided on the side of the adapter facing the electrode terminal, and the convex portion is inserted into the through hole; one of the outer peripheral surface of the convex portion and the hole wall of the through hole is provided with a groove, and the other one is provided with a protrusion that snaps into engagement with the groove.

2. The battery cell according to claim 1, characterized in that: The protrusions are strip-shaped protrusions.

3. The battery cell according to claim 1 or 2, characterized in that: The protrusion is an annular protrusion.

4. The battery cell according to claim 3, characterized in that: The protrusion is in a closed ring shape.

5. The battery cell according to claim 3 or 4, characterized in that: The circumferential direction of the protrusion intersects with the axial direction of the convex portion.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The width of the protrusion is gradually reduced in a direction approaching the groove bottom of the groove.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The protrusion has a fixing surface and a guiding surface, the fixing surface is arranged on the side of the protrusion away from the groove, the guiding surface is arranged opposite to the groove wall of the groove, the guiding surface is obliquely connected to the fixing surface, and the angle formed between the guiding surface and the fixing surface is an acute angle.

8. The battery cell according to claim 7, characterized in that: The angle formed between the guide surface and the fixing surface is 5° to 30°.

9. The battery cell according to any one of claims 1 to 8, characterized in that: On any longitudinal cross-section of the convex portion and the through hole, the maximum radial dimension of the convex portion is D1, the minimum radial dimension of the through hole is D2, ε is calculated by (D1-D2) / D1, and ε is configured as: 0≤ε≤3.5%.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The cross-section of the protrusion is trapezoidal, arched or fan-shaped, and the cross-section of the protrusion is parallel to the axial direction of the convex portion.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The cross-section of the convex portion is circular, and the cross-section of the convex portion is perpendicular to the axial direction of the convex portion.

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

13. An electrical device, characterized in that: The electrical device comprises the battery according to claim 12, or the battery cell according to any one of claims 1-11.

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