Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell, an electrode assembly, an electrode terminal and a current collection assembly, the electrode assembly is arranged in a containing cavity, a tab of the electrode assembly extends out of an electrode main body, the electrode terminal is arranged on the shell, and the current collection assembly is arranged on the shell. A first current collecting piece in the current collecting assembly comprises a current collecting main body which is located on one side, in the first direction, of the electrode main body and electrically connected to the electrode terminal, a second connecting part in a second current collecting piece is connected to a first connecting part and a tab, and the first connecting part is provided with a first through hole; at least part of the protrusion arranged on the flow collecting body in a protruding mode is contained in the first through hole and connected to the first connecting part. In the structure, the bulge convexly arranged on the current collecting main body extends into the first through hole and is connected with the first connecting part, so that the first current collecting piece and the second current collecting piece are firmly connected, the possibility of connection failure of the first current collecting piece and the second current collecting piece is reduced, and the reliability of the battery is favorably improved.

Description

Technical Field

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

[0002] Batteries have the advantages of high specific energy and high power density. They are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric tools, etc.

[0003] As the application scope of batteries becomes wider and wider, how to improve the reliability of batteries has attracted more and more attention from technicians in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, wherein the battery cell is beneficial to improving the reliability of the battery.

[0005] In the first aspect, some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode terminal and a current collecting assembly, the shell having a accommodating cavity; the electrode assembly is arranged in the accommodating cavity, the electrode assembly includes an electrode body and a pole ear extending from the end of the electrode body along a first direction; the electrode terminal is arranged in the shell; the current collecting assembly includes a first current collecting part and a second current collecting part, the first current collecting part includes a current collecting body and a protrusion, the current collecting body is located on one side of the electrode body along the first direction and is electrically connected to the electrode terminal, the protrusion is protruding from the current collecting body, the second current collecting part includes a first connecting part and a second connecting part, the first connecting part is provided with a first through hole, at least a part of the protrusion is accommodated in the first through hole and connected to the first connecting part, and the second connecting part is connected to the first connecting part and the pole ear.

[0006] In the above structure, the protrusion on the current collecting body extends into the first through hole and is connected to the first connecting portion, so that the first current collecting member and the second current collecting member are firmly connected, reducing the possibility of connection failure between the two, which is beneficial to improving the reliability of the battery.

[0007] According to the battery cell provided in some embodiments of the present application, the protrusion is riveted to the first connecting portion. The riveting of the protrusion and the first connecting portion can improve the connection strength between the first current collector and the second current collector, which is beneficial to reduce the possibility of connection failure between the first current collector and the second current collector.

[0008] According to the battery cell provided in some embodiments of the present application, the first through hole includes a first section and a second section that are interconnected, the first section is farther away from the current collector than the second section, and the radial dimension of the first section is greater than the radial dimension of the second section; the protrusion includes a connected connection portion and a base portion, the base portion is accommodated in the second section, the connection portion is accommodated in the first section, the radial dimension of the connection portion is greater than the radial dimension of the base portion, and the outer periphery of the connection portion abuts against the inner wall of the first section. By setting the radial dimension of the connection portion to be greater than the radial dimension of the base portion, when the connection portion abuts against the side wall of the first section, the radial dimension of the connection portion is greater than the radial dimension of the second section, the connection portion is not easy to escape from the first through hole through the second section, the protrusion is not easy to escape from the first through hole, the connection between the protrusion and the first connection portion is firm, and the connection between the first current collector and the second current collector is not easy to fail.

[0009] According to the battery cell provided in some embodiments of the present application, the connecting part is welded to the first connecting part. By welding the connecting part to the first connecting part, the materials of the connecting part and the first connecting part can be melted together, which is not only conducive to improving the connection strength between the connecting part and the first connecting part, but also conducive to improving the flow capacity between the connecting part and the first connecting part, which helps to reduce the internal resistance of the battery cell.

[0010] According to the battery cell provided in some embodiments of the present application, a first welding structure is formed between the connecting portion and the inner wall of the first section, and the first welding structure is an annular structure extending along the circumference of the connecting portion. By setting the first welding structure as an annular structure extending along the circumference of the connecting portion, the first welding structure can connect the entire outer ring edge of the connecting portion to the first connecting portion, which is conducive to improving the firmness of the connection between the connecting portion and the first connecting portion.

[0011] According to the battery cell provided in some embodiments of the present application, the end face of the protrusion facing away from the current collecting body does not protrude from the side face of the first connecting part facing away from the current collecting body. By making the end face of the protrusion facing away from the current collecting body not protrude from the side face of the first connecting part facing away from the current collecting body, the side face of the first connecting part facing away from the current collecting body does not have a protruding structure, which facilitates the stacking of part of the second connecting part on the side of the first connecting part facing away from the current collecting body, which is beneficial to reducing the space occupied by the current collecting assembly in the first direction and helps to improve the energy density of the battery cell.

[0012] According to the battery cell provided in some embodiments of the present application, the first current collector is provided with a second through hole, and the second through hole penetrates the protrusion and the current collecting body along the first direction. By providing the second through hole penetrating the protrusion and the current collecting body along the first direction, the assembler can insert the hole expansion device into the second through hole to deform the protrusion so as to abut and connect to the first connecting part, thereby realizing the riveting of the protrusion on the first connecting part.

[0013] According to the battery cell provided in some embodiments of the present application, the first connection part is welded to the current collecting body; the side of the first connection part facing away from the current collecting body is formed with a second welding structure, and the second welding structure is arranged along the periphery of the first through hole. Through the above structure, the first connection part can achieve material fusion with the current collecting body through welding at the periphery of the first through hole, which is conducive to improving the flow capacity between the first connection part and the current collecting body.

[0014] According to the battery cell provided in some embodiments of the present application, there are multiple protrusions, and the multiple protrusions are arranged at intervals, so that the current collector can be connected to the first connecting part at multiple locations through the multiple protrusions, which is beneficial to improving the connection strength between the first current collector and the second current collector.

[0015] According to the battery cell provided in some embodiments of the present application, the second connection portion includes a bending structure and an extension structure, the extension structure is bent relative to the first direction and connected to the pole ear, and the extension structure is connected to the first connection portion through the bending structure. By bending the extension structure relative to the first direction, the extension structure can be stacked on one side of the first connection portion in the first direction, which is conducive to reducing the space occupied by the second current collector in the first direction.

[0016] According to the battery cells provided in some embodiments of the present application, at least a portion of the extension structure is bent at a side of the first connecting portion away from the current collecting body, and the pole ear is connected to a side of the extension structure away from the first connecting portion, so that the pole ear, the extension structure, the first connecting portion and the current collecting body can be stacked along a first direction, making it convenient to arrange the pole ear, the first current collecting part and the second current collecting part.

[0017] In a second aspect, some embodiments of the present application further provide a battery, which includes a battery cell provided by any of the above technical solutions.

[0018] In a third aspect, some embodiments of the present application further provide an electrical device, which includes a battery provided by the above technical solution, and the battery is used to provide electrical energy.

[0019] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0020] Some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode terminal and a current collecting assembly, wherein the electrode assembly is arranged in the accommodating cavity, the electrode lug of the electrode assembly extends from the electrode body, the electrode terminal is arranged on the shell, the first current collecting member in the current collecting assembly includes a current collecting body located on one side of the electrode body along the first direction and electrically connected to the electrode terminal, the second connecting portion in the second current collecting member is connected to the first connecting portion and the lug, the first connecting portion is provided with a first through hole, at least part of the protrusion protruding from the current collecting body is accommodated in the first through hole and connected to the first connecting portion. In the above structure, the protrusion protruding from the current collecting body extends into the first through hole and is connected to the first connecting portion, so that the connection between the first current collecting member and the second current collecting member is firm, reducing the possibility of connection failure between the two, which is conducive to improving the reliability of the battery.

[0021] 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

[0022] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0023] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0024] Figure 2 A schematic diagram of disassembling a battery provided in some embodiments of the present application;

[0025] Figure 3 A schematic diagram of disassembling a battery cell provided in some embodiments of the present application;

[0026] Figure 4 A schematic diagram of the structure of the current collecting assembly provided in some embodiments of the present application when the bending structure is not bent;

[0027] Figure 5 A left side view of the current collecting assembly provided in some embodiments of the present application when the bending structure is not bent;

[0028] Figure 6 A schematic diagram of the structure of a second current collecting member provided in some embodiments of the present application;

[0029] Figure 7 for Figure 5Sectional view at AA in the middle;

[0030] Figure 8 A schematic diagram of a portion of the structure of a battery cell provided in some embodiments of the present application when the bending structure is bent;

[0031] Fig. 9 for Figure 8 Enlarged view of point B in the middle.

[0032] In the attached picture:

[0033] 1. Shell; 2. Electrode assembly; 21. Electrode body; 22. Tab;

[0034] 3. Accommodating cavity;

[0035] 4. Current collecting assembly; 41. First current collecting member; 411. Current collecting body; 412. Protrusion; 4121. Connecting portion; 4122. Base portion; 413. Second through hole;

[0036] 42, second current collecting member; 421, first connecting portion; 4211, first through hole; 42111, first section; 42112, second section; 422, second connecting portion; 4221, bending structure; 4222, extending structure; 4223, thinning structure;

[0037] 5. The first welding structure;

[0038] 6. Second welding structure;

[0039] 1000, vehicle; 100, battery; 20, battery cell;

[0040] 200. Controller; 300. Motor; 400. First direction. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0043] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and 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, and therefore should not be understood as a limitation on the embodiments of the present application.

[0044] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "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, and 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 the embodiments of the present application can be understood according to the specific circumstances.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0048] The battery mentioned in the embodiments of the present application includes one or more battery modules. The battery module refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0049] The battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0050] The battery cells may be ion battery cells, including but not limited to lithium ion battery cells, sodium ion battery cells, sodium lithium ion battery cells, magnesium ion battery cells, and calcium ion battery cells.

[0051] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting. At the same time, the ion channel arranged on it allows the active ions to pass through.

[0052] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte may be in a liquid, gel or solid state.

[0053] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0054] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0055] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0056] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0057] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0058] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0059] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0060] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0061] The tabs of the electrode assembly in the battery cell are usually connected to the electrode terminals through the current collecting assembly. The current collecting assembly in the prior art usually includes a first current collecting member and a second current collecting member connected by welding. Since there is a possibility of poor welding such as cold welding between the first current collecting member and the second current collecting member, when subjected to external force, the first current collecting member and the second current collecting member are prone to open welding, making the connection between the first current collecting member and the second current collecting member invalid, which is not conducive to improving the reliability of the battery.

[0062] In order to improve the reliability of the battery, some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, an electrode terminal and a current collecting assembly, wherein the electrode assembly is arranged in a receiving cavity, the electrode lug of the electrode assembly extends from the electrode body, the electrode terminal is arranged on the shell, the first current collecting member in the current collecting assembly includes a current collecting body located on one side of the electrode body along the first direction and electrically connected to the electrode terminal, the second connecting portion in the second current collecting member is connected to the first connecting portion and the lug, the first connecting portion is provided with a first through hole, at least part of the protrusion protruding from the current collecting body is accommodated in the first through hole and connected to the first connecting portion. In the above structure, the protrusion protruding from the current collecting body extends into the first through hole and is connected to the first connecting portion, so that the connection between the first current collecting member and the second current collecting member is firm, reducing the possibility of connection failure between the two, which is conducive to improving the reliability of the battery.

[0063] The battery cell described in the embodiments of the present application is suitable for use in batteries and electrical devices using batteries. The battery cell can be used for, but is not limited to, batteries, and can also be used for vehicles, aircraft, ships, electronic equipment, power tools and other products, and can improve the reliability of these products.

[0064] Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Vehicles may be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include aircraft, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. 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, etc.

[0065] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0066] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 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 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0067] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0068] Please refer to Figure 2 , Figure 2An exploded diagram of a battery 100 provided for some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is accommodated in the housing 10. Among them, the housing 10 is used to provide a storage space for the battery cell 20. There may be multiple battery cells 20 in the battery 100, and the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 20 are both connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the housing 10; of course, the battery 100 can also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the housing 10.

[0069] The box 10 may include a first box 101 and a second box 102, and the first box 101 and the second box 102 cover each other to define a placement space for accommodating the battery cells 20. The first box 101 and the second box 102 may be in various shapes, such as a cuboid, a cylinder, etc. The first box 101 may be a hollow structure with one side open, and the second box 102 may also be a hollow structure with one side open, and the open side of the second box 102 covers the open side of the first box 101, thereby forming a box 10 with a placement space.

[0070] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 20 .

[0071] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0072] In some embodiments of the present application, Figure 3 As shown, the battery cell 20 includes a housing 1 and an electrode assembly 2, and the electrode assembly 2 is accommodated in the housing 1. The housing 1 can be a wall structure arranged on the periphery of the battery cell 20, which can form a receiving cavity 3 for accommodating other components of the battery cell 20 such as the electrode assembly 2 and the electrolyte. The electrode assembly 2, as a component accommodated in the housing 1, is in contact with the electrolyte, and active ions (such as lithium ions) can be conducted between the electrode assembly 2 and the electrolyte.

[0073] Some embodiments of the present application provide a battery cell 20, Figure 3The battery cell 20 includes a housing 1, an electrode assembly 2, an electrode terminal and a current collecting assembly 4. The housing 1 has a receiving cavity 3. The electrode assembly 2 is disposed in the receiving cavity 3. The electrode assembly 2 includes an electrode body 21 and an electrode ear 22 extending from an end of the electrode body 21 along a first direction 400. The electrode terminal is disposed on the housing 1. Figure 4 and Figure 5 The current collecting assembly 4 includes a first current collecting part 41 and a second current collecting part 42. The first current collecting part 41 includes a current collecting body 411 and a protrusion 412. The current collecting body 411 is located on one side of the electrode body 21 along the first direction 400 and is electrically connected to the electrode terminal. The protrusion 412 is protruded from the current collecting body 411. The second current collecting part 42 includes a first connecting portion 421 and a second connecting portion 422. The first connecting portion 421 is provided with a first through hole 4211. At least a portion of the protrusion 412 is accommodated in the first through hole 4211 and connected to the first connecting portion 421. The second connecting portion 422 is connected to the first connecting portion 421 and the electrode ear 22.

[0074] The shell 1 can be a wall structure arranged on the periphery of the battery cell 20, which can form a receiving cavity 3 for accommodating other components of the battery cell 20 such as the electrode assembly 2 and electrolyte, and can protect other components of the battery cell 20 such as the electrode assembly 2.

[0075] The electrode assembly 2 is disposed in the accommodating cavity 3 and can contact the electrolyte in the accommodating cavity 3. The electrode body 21 can be the main structure in the electrode assembly 2, and the tab 22 can extend from the end of the electrode body 21 along the first direction 400 to connect with other components in the battery cell 20.

[0076] The electrode terminal is a component provided on the housing 1 and can be used to electrically connect to an electrical device or a charging device outside the battery cell 20 so as to charge and discharge the battery cell 20. The electrode terminal may include but is not limited to a columnar structure, and those skilled in the art may configure it according to actual conditions.

[0077] The current collecting assembly 4 may be an assembly for connecting the electrode terminal with the pole tab 22. The first current collecting member 41 and the second current collecting member 42 are two components connected to each other in the current collecting assembly 4, wherein the first current collecting member 41 is connected to the electrode terminal, and the second current collecting member 42 is connected to the pole tab 22. Exemplarily, there are a plurality of pole tabs 22 extending from the end of the electrode body 21 in the first direction 400, and the second current collecting member 42 is connected to the plurality of pole tabs 22.

[0078] The current collector body 411 may be a main structure in the first current collector 41, and the protrusion 412 may be a structure protruding from the surface of the current collector body 411. The current collector body 411 is disposed on one side of the electrode body 21 along the first direction 400, so that the tab 22 extending from the end of the electrode body 21 along the first direction 400 can be conveniently connected to it through the second current collector. By electrically connecting the current collector body 411 to the electrode terminal, the tab 22 can be electrically connected to the electrode terminal by connecting to the second current collector.

[0079] The first connection part 421 and the second connection part 422 are two parts connected to each other in the second current collector 42. The first connection part 421 is a part connected to the first current collector 41, and the second connection part 422 is a part connected to the pole ear 22. The first through hole 4211 can be a hole-shaped structure provided on the first connection part 421 and extending through the first direction 400. By allowing at least a portion of the protrusion 412 to extend into the first through hole 4211 and be connected to the first connection part 421, the protrusion 412 can be firmly connected to the first through hole 4211 and is not easy to come out, so that the first current collector 41 and the second current collector 42 are firmly connected and not easy to fail.

[0080] In the above structure, since the protrusion 412 protruding from the current collecting body 411 extends into the first through hole 4211 and is connected to the first connecting portion 421, the first current collecting member 41 and the second current collecting member 42 are firmly connected, reducing the possibility of connection failure between the two, which is beneficial to improving the reliability of the battery 100.

[0081] In some embodiments, the protrusion 412 is riveted to the first connection portion 421 .

[0082] The protrusion 412 is riveted to the first connection part 421, and at least a portion of the protrusion 412 is inserted into the first through hole 4211, and at least a portion inserted into the first through hole 4211 is deformed to form a nail head, so that the protrusion 412 is connected to the first connection part 421. Since at least a portion of the protrusion 412 extends into the first through hole 4211, the protrusion 412 can bear a larger load between the first current collecting part 41 and the second current collecting part 42. The riveting of the protrusion 412 to the first connection part 421 can improve the connection strength between the first current collecting part 41 and the second current collecting part 42, which is conducive to reducing the possibility of failure of the connection between the first current collecting part 41 and the second current collecting part 42.

[0083] In some embodiments, continue to refer to Figure 6 The first through hole 4211 includes a first section 42111 and a second section 42112 that are interconnected. The first section 42111 is farther away from the current collecting body 411 than the second section 42112. The radial dimension of the first section 42111 is greater than the radial dimension of the second section 42112. Figure 7The protrusion 412 includes a connected connecting portion 4121 and a base portion 4122, the base portion 4122 is accommodated in the second section 42112, the connecting portion 4121 is accommodated in the first section 42111, the radial dimension of the connecting portion 4121 is greater than the radial dimension of the base portion 4122, and the outer periphery of the connecting portion 4121 is abutted against the inner wall of the first section 42111.

[0084] The first section 42111 and the second section 42112 may be two parts of the first through hole 4211 that are connected to each other in the axial direction of the first through hole 4211, and the radial dimensions of the two parts are different. The first section 42111 is farther away from the current collecting body 411 than the second section 42112, and by setting the radial dimension of the first section 42111 to be larger than the radial dimension of the second section 42112, the protrusion 412 extending into the first through hole 4211 is not easy to fall out from the side where the current collecting body 411 is located when it abuts against the side wall of the first section 42111.

[0085] The connecting portion 4121 and the base portion 4122 may be two parts of the protrusion 412 that are connected to each other in the axial direction thereof, and the radial dimensions of the two parts are different. The connecting portion 4121 is away from the current collecting body 411 relative to the base portion 4122, the base portion 4122 corresponds to the second section 42112, and the connecting portion 4121 corresponds to the first section 42111.

[0086] The base portion 4122 is accommodated in the second section 42112, and the connecting portion 4121 is accommodated in the first section 42111. By setting the radial dimension of the connecting portion 4121 to be larger than the radial dimension of the base portion 4122, when the connecting portion 4121 is abutted against the side wall of the first section 42111, the radial dimension of the connecting portion 4121 is larger than the radial dimension of the second section 42112, and the connecting portion 4121 is not easy to escape from the first through hole 4211 through the second section 42112, so that the protrusion 412 is not easy to escape from the first through hole 4211, so that the connection between the protrusion 412 and the first connecting portion 421 is firm, and the connection between the first current collecting component 41 and the second current collecting component 42 is not easy to fail.

[0087] In some embodiments, the radial dimension of the first segment 42111 gradually increases in a direction away from the current collecting body 411 .

[0088] By setting the radial dimension of the first section 42111 to gradually increase, the radial dimension of the first section 42111 changes continuously, so that steps are less likely to appear in the first through hole 4211, and its side surface is relatively smooth, so that the protrusion 412 extending into the first through hole 4211 can be more closely in contact with the side surface of the first through hole 4211, which is beneficial to improving the firmness of the connection between the protrusion 412 and the first connecting portion 421.

[0089] In some embodiments, the connection portion 4121 is welded to the first connection portion 421 .

[0090] By welding the connecting part 4121 to the first connecting part 421, the materials of the connecting part 4121 and the first connecting part 421 can be melted together, which is not only beneficial to improve the connection strength between the connecting part 4121 and the first connecting part 421, but also beneficial to improve the current flow capacity between the connecting part 4121 and the first connecting part 421, which helps to reduce the internal resistance of the battery cell 20.

[0091] Exemplarily, the connection part 4121 and the first connection part 421 may be welded together by butt welding, so that the welding quality of the connection part 4121 and the first connection part 421 can be judged visually.

[0092] In some embodiments, a first welding structure 5 is formed between the connecting portion 4121 and the inner wall of the first section 42111 , and the first welding structure 5 is an annular structure extending along the circumference of the connecting portion 4121 .

[0093] The first welding structure 5 may be a structure formed after the materials of the connection part 4121 and the first connection part 421 are melted and cooled. The first welding structure 5 is formed between the connection part 4121 and the inner wall of the first section 42111, and the first welding structure 5 can well connect the connection part 4121 with the first connection part 421. By setting the first welding structure 5 as an annular structure extending along the circumference of the connection part 4121, the first welding structure 5 can connect the entire outer ring edge of the connection part 4121 with the first connection part 421, which is conducive to improving the firmness of the connection between the connection part 4121 and the first connection part 421.

[0094] In some embodiments, the end surface of the protrusion 412 facing away from the current collecting body 411 does not protrude beyond the side surface of the first connecting portion 421 facing away from the current collecting body 411 .

[0095] The end surface of the protrusion 412 facing away from the current collecting body 411 does not protrude from the side surface of the first connecting portion 421 facing away from the current collecting body 411. It can be that the end surface of the protrusion 412 facing away from the current collecting body 411 is flush with the side surface of the first connecting portion 421 facing away from the current collecting body 411; or the end surface of the protrusion 412 facing away from the current collecting body 411 is close to the current collecting body 411 relative to the side surface of the first connecting portion 421 facing away from the current collecting body 411.

[0096] By ensuring that the end surface of the protrusion 412 facing away from the current collecting body 411 does not protrude from the side of the first connecting portion 421 facing away from the current collecting body 411, the side of the first connecting portion 421 facing away from the current collecting body 411 does not have a protruding structure, which facilitates the stacking of part of the second connecting portion 422 on the side of the first connecting portion 421 facing away from the current collecting body 411, which is beneficial to reducing the space occupied by the current collecting assembly 4 in the first direction 400 and helps to improve the energy density of the battery cell 20.

[0097] In some embodiments, the first current collecting member 41 is provided with a second through hole 413 , and the second through hole 413 penetrates the protrusion 412 and the current collecting body 411 along the first direction 400 .

[0098] The second through hole 413 may be a hole-shaped structure provided on the first current collector, which penetrates the protrusion 412 and the current collector body 411 along the first direction 400. By providing the second through hole 413 penetrating the protrusion 412 and the current collector body 411 along the first direction 400, the assembler can insert the hole expansion device into the second through hole 413 to deform the protrusion 412 so as to abut and connect it to the first connection part 421, thereby achieving riveting of the protrusion 412 on the first connection part 421.

[0099] For example, the assembler may insert the reaming device into the second through hole 413 from the side of the protrusion 412 away from the current collecting body 411 , so that the end of the protrusion 412 away from the current collecting body 411 can be riveted to the first connecting portion 421 .

[0100] In some embodiments, the first connection portion 421 is welded to the current collecting body 411 ; a second welding structure 6 is formed on a side of the first connection portion 421 facing away from the current collecting body 411 , and the second welding structure 6 is disposed along the outer periphery of the first through hole 4211 .

[0101] By welding the first connection portion 421 to the current collecting body 411 , the materials of the first connection portion 421 and the current collecting body 411 are melted together, thereby improving the current flow capacity between the second current collecting member 42 and the first current collecting member 41 , which is beneficial to reducing the internal resistance of the battery cell 20 .

[0102] The second welding structure 6 may be a structure formed after the material of the first connection part 421 is melted and cooled during the welding process. The second welding structure 6 is formed on the side of the first connection part 421 facing away from the current collecting body 411 and is arranged along the periphery of the first through hole 4211, so that the first connection part 421 can achieve material melting with the current collecting body 411 through welding at the periphery of the first through hole 4211, which is beneficial to improve the flow capacity between the first connection part 421 and the current collecting body 411.

[0103] Exemplarily, the second welding structure 6 may be an annular structure such as a rectangular frame or a circular frame.

[0104] In some embodiments, a plurality of protrusions 412 are provided, and the plurality of protrusions 412 are arranged at intervals.

[0105] By providing a plurality of protrusions 412 protruding from the current collector body 411 , the current collector body 411 can be connected to the first connection portion 421 at multiple locations through the plurality of protrusions 412 , which is beneficial to improving the connection strength between the first current collector and the second current collector.

[0106] The plurality of protrusions 412 are arranged at intervals, and may be arranged at equal intervals, so that the connection force between the first current collector and the second current collector is distributed more evenly, which is helpful to reduce the possibility of stress concentration.

[0107] In some embodiments, continue to refer to Figure 8 and Fig. 9 The second connection portion 422 includes a bending structure 4221 and an extending structure 4222 . The extending structure 4222 is bent relative to the first direction 400 and connected to the pole ear 22 . The extending structure 4222 is connected to the first connection portion 421 through the bending structure 4221 .

[0108] The bending structure 4221 and the extending structure 4222 may be different parts of the second connecting portion 422 , wherein the extending structure 4222 is connected to the first connecting portion 421 through the bending structure 4221 , and the tab 22 is connected to the extending structure 4222 .

[0109] By bending the extending structure 4222 relative to the first direction 400 , the extending structure 4222 can be stacked on one side of the first connecting portion 421 in the first direction 400 , which helps to reduce the space occupied by the second current collecting member 42 in the first direction 400 .

[0110] Exemplarily, the second current collecting member 42 is an integrally formed structure. The second current collecting member 42 may be a member made by an integrally formed process such as stamping, so that the second current collecting member 42 has a higher processing efficiency and a lower processing cost.

[0111] In some embodiments, at least a portion of the extension structure 4222 is bent at a side of the first connection portion 421 away from the current collecting body 411 , and the electrode tab 22 is connected to a side of the extension structure 4222 away from the first connection portion 421 .

[0112] By bending at least part of the extension structure 4222 to the side of the first connection part 421 away from the current collecting body 411, and connecting the pole ear 22 to the side of the extension structure 4222 away from the first connection part 421, the pole ear 22, the extension structure 4222, the first connection part 421 and the current collecting body 411 can be stacked along the first direction 400, so that the arrangement of the pole ear 22, the first current collecting part 41 and the second current collecting part 42 is convenient.

[0113] In some embodiments, the bending structure 4221 is provided with a thinning structure 4223 .

[0114] The thinning structure 4223 may be a structure formed by removing material from the bending structure 4221, and its thickness is smaller than the thickness of other parts of the bending structure 4221, so that the structural strength of the thinning structure 4223 is smaller than that of other parts of the bending structure 4221. By providing the thinning structure 4223 on the bending structure 4221, the bending structure 4221 can be bent along the thinning structure 4223 more easily, so that the extension structure 4222 can be bent relative to the first direction 400 more easily.

[0115] In some embodiments, the thickness of the first current collecting member 41 is greater than the thickness of the second current collecting member 42 .

[0116] By setting the thickness of the first current collecting part 41 to be greater than the thickness of the second current collecting part 42, the structural strength of the first current collecting part 41 is greater than the structural strength of the second current collecting part 42, so that when a portion of the second current collecting part 42 is bent, the first current collecting part 41 is not easily deformed.

[0117] Some embodiments of the present application further provide a battery 100 , which includes a battery cell 20 provided by the above technical solution.

[0118] Some embodiments of the present application further provide an electrical device, which includes the battery 100 provided by the above technical solution, and the battery 100 is used to provide electrical energy.

[0119] Some embodiments of the present application provide a battery cell 20, which includes a shell 1, an electrode assembly 2, an electrode terminal and a current collecting assembly 4, the electrode assembly 2 and the current collecting assembly 4 are arranged in the accommodating cavity 3 of the shell 1, the electrode lug 22 of the electrode assembly 2 extends from the electrode body 21, the electrode terminal is arranged on the shell 1, the first current collecting part 41 in the current collecting assembly 4 includes a current collecting body 411 and a protrusion 412 protruding from the current collecting body 411, the second connecting part 422 in the second current collecting part 42 is connected to the first connecting part 421 and the lug 22, and the first connecting part 421 is provided with a first through hole 4211. The first through hole 4211 includes a first section 42111 having a radial dimension greater than that of the second section 42112, the protrusion 412 includes a base portion 4122 having a radial dimension greater than that of the connecting portion 4121, the base portion 4122 is accommodated in the second section 42112, the connecting portion 4121 is accommodated in the first section 42111, and the outer periphery of the connecting portion 4121 abuts against the inner wall of the first section 42111. A first welding structure 5 extending along the circumference of the connecting portion 4121 is formed between the connecting portion 4121 and the inner wall of the first section 42111. A second welding structure 6 arranged along the outer periphery of the first through hole 4211 is formed on the side of the first connecting portion 421 facing away from the current collecting body 411. In the above structure, the protrusion 412 protruding from the current collecting body 411 extends into the first through hole 4211 and is connected to the first connecting portion 421, so that the first current collecting member 41 and the second current collecting member 42 are firmly connected, reducing the possibility of connection failure between the two, which is beneficial to improving the reliability of the battery 100.

[0120] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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: A housing having a receiving cavity; An electrode assembly is disposed in the accommodating cavity, wherein the electrode assembly comprises an electrode body and an electrode ear extending from an end of the electrode body along a first direction; An electrode terminal, disposed on the housing; A current collecting assembly comprises a first current collecting piece and a second current collecting piece, wherein the first current collecting piece comprises a current collecting body and a protrusion, wherein the current collecting body is located on one side of the electrode body along the first direction and is electrically connected to the electrode terminal, and the protrusion is protruded from the current collecting body, and the second current collecting piece comprises a first connecting portion and a second connecting portion, wherein the first connecting portion is provided with a first through hole, wherein at least a portion of the protrusion is accommodated in the first through hole and connected to the first connecting portion, and the second connecting portion is connected to the first connecting portion and the electrode lug.

2. The battery cell according to claim 1, characterized in that: The protrusion is riveted to the first connecting portion.

3. The battery cell according to claim 1, characterized in that: The first through hole comprises a first section and a second section which are interconnected, the first section is farther away from the current collecting body than the second section, and the radial dimension of the first section is greater than the radial dimension of the second section; The protrusion includes a connected connecting portion and a base portion, the base portion is accommodated in the second section, the connecting portion is accommodated in the first section, the radial dimension of the connecting portion is greater than the radial dimension of the base portion, and the outer periphery of the connecting portion abuts against the inner wall of the first section.

4. The battery cell according to claim 3, characterized in that: The connecting portion is welded to the first connecting portion.

5. The battery cell according to claim 4, characterized in that: A first welding structure is formed between the connecting portion and the inner wall of the first section, and the first welding structure is an annular structure extending along the circumference of the connecting portion.

6. The battery cell according to claim 1, characterized in that: The end surface of the protrusion facing away from the current collecting body does not protrude beyond the side surface of the first connecting portion facing away from the current collecting body.

7. The battery cell according to claim 1, characterized in that: The first current collecting member is provided with a second through hole, and the second through hole penetrates the protrusion and the current collecting body along the first direction.

8. The battery cell according to claim 1, characterized in that: The first connection portion is welded to the current collecting body; a second welding structure is formed on the side of the first connection portion facing away from the current collecting body, and the second welding structure is arranged along the outer periphery of the first through hole.

9. The battery cell according to claim 1, characterized in that: There are a plurality of protrusions, and the plurality of protrusions are arranged at intervals.

10. The battery cell according to claim 1, characterized in that: The second connection portion includes a bending structure and an extension structure, the extension structure is bent relative to the first direction and connected to the tab, and the extension structure is connected to the first connection portion through the bending structure.

11. The battery cell according to claim 10, characterized in that: At least a portion of the extension structure is bent at a side of the first connection portion away from the current collecting body, and the electrode tab is connected to a side of the extension structure away from the first connection portion.

12. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 11.

13. An electrical device, characterized in that: Comprising the battery of claim 12, the battery being used to provide electrical energy.

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