Battery cell, battery, electrical equipment, and method and equipment for manufacturing battery cell

Abstract

The embodiments of the present application provide a battery cell, a battery, an electrical device, and a method and equipment for manufacturing a battery cell, which belongs to the field of battery technology. The battery cell includes a shell, an electrode assembly, an end cover, and a current collecting member. The electrode assembly is accommodated in the shell, and the electrode assembly includes a main body and a first tab. The end cover covers the opening of the shell, and an injection hole is provided on the end cover. The current collecting member is accommodated in the shell and is located on the side of the end cover facing the main body. The current collecting member is used to connect the first tab and the end cover to achieve electrical connection between the end cover and the tab. The current collecting member is provided with a first center hole and a guide channel. The first center hole is arranged opposite to the injection hole. The guide channel is configured to allow at least part of the electrolyte entering the interior of the battery cell from the injection hole to enter the main body. The electrolyte entering the interior of the battery cell from the injection hole can more easily infiltrate the electrode assembly, thereby improving the injection efficiency and improving the infiltration effect of the electrolyte on the electrode assembly.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] A battery cell typically consists of a casing, an electrode assembly, and an end cap. The end cap fits over the casing, providing a sealed space for the electrode assembly and electrolyte. The battery cell generates electrical energy through a chemical reaction between the electrode assembly and the electrolyte. Currently, electrolyte is typically injected into the battery cell through an injection hole in the end cap, making it difficult for the electrolyte to penetrate the electrode assembly. Summary of the Invention

[0004] The embodiments of the present application provide a battery cell, a battery, an electrical device, and a method and device for manufacturing the battery cell to improve the problem of difficulty in electrolyte infiltration into electrode assemblies.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell having an opening; an electrode assembly accommodated in the shell, the electrode assembly comprising a main body and a first pole tab, the first pole tab protruding from one end of the main body; an end cover covering the opening, the end cover being provided with an injection hole; a current collecting member accommodated in the shell and located on the side of the end cover facing the main body, the current collecting member being used to connect the first pole tab and the end cover to achieve electrical connection between the end cover and the first pole tab; wherein the current collecting member is provided with a first center hole and a flow guide channel, and in the axial direction of the first center hole, the first center hole and the injection hole are arranged opposite to each other, and the flow guide channel is configured to allow at least part of the electrolyte entering the interior of the battery cell from the injection hole to enter the main body.

[0006] In the above technical solution, the current collecting member is provided with a first central hole and a flow-guiding channel. When electrolyte is injected into the battery cell through the injection hole, the electrolyte can not only flow into the main body through the first central hole of the current collecting member, but also flow into the main body through the flow-guiding channel of the current collecting member to wet the electrode sheets. This structure increases the flow path for the electrolyte to flow into the main body, allowing the electrolyte entering the battery cell through the injection hole to more easily wet the electrode assembly, improving injection efficiency and enhancing the wetting effect of the electrolyte on the electrode assembly.

[0007] In some embodiments, the current collecting component has an outer surface and an inner surface facing each other, the outer surface faces the end cover, and the inner surface faces the first electrode tab; the flow guide channel includes a flow guide hole, and the flow guide hole passes through the outer surface and the inner surface of the current collecting component.

[0008] In the above technical solution, the guide holes penetrate the outer surface and the inner surface of the current collecting component. The electrolyte that enters the battery cell through the injection hole can flow directly through the guide holes from the side of the current collecting component facing the end cover to the side facing the main body, so that the electrolyte enters the interior of the main body to infiltrate the electrode.

[0009] In some embodiments, the guide hole is offset from the first central hole so as to be independent of the first central hole.

[0010] In the above technical solution, the guide hole deviates from the first central hole, which is beneficial to the forming process of the guide hole, and the current collecting component has better strength.

[0011] In some embodiments, the guide hole penetrates through the wall of the first central hole.

[0012] In the above technical solution, the guide hole penetrates the hole wall of the first center hole, so that the guide hole and the first center hole are connected, so that the electrolyte can flow between the guide hole and the first center hole. If the electrolyte entering the guide hole cannot enter the main body in time, the electrolyte can flow from the guide hole into the first center hole and then enter the main body through the first center hole. If the electrolyte entering the first center hole cannot enter the main body in time, the electrolyte can flow from the first center hole into the guide hole and then enter the main body through the guide hole.

[0013] In some embodiments, the guide holes extend radially relative to the first central hole.

[0014] In the above technical solution, the guide hole extends radially along the first center hole, so that the electrolyte can flow radially along the first center hole in the guide hole, increasing the flow range of the electrolyte in the guide hole, so that the electrolyte can enter the interior of the main body from multiple areas of the guide hole, thereby improving the injection efficiency and the infiltration effect of the electrolyte on the electrode assembly.

[0015] In some embodiments, the flow guiding channel includes a plurality of flow guiding holes, and the plurality of flow guiding holes are circumferentially spaced and distributed around the first central hole.

[0016] In the above technical solution, multiple guide holes are circumferentially spaced around the first central hole, and the electrolyte can flow along the multiple guide holes into the interior of the main body, thereby improving the injection efficiency and the electrolyte infiltration effect on the electrode assembly.

[0017] In some embodiments, the end cover has a rest surface, which is used to rest against the outer surface; a recess is provided on the end cover, which is recessed from the rest surface in a direction away from the main body, and the recess is connected to the injection hole. In the axial direction of the first center hole, the recess is arranged opposite to at least one guide hole.

[0018] In the above technical solution, the recess is connected to the injection hole. During the process of injecting electrolyte into the battery cell through the injection hole, the electrolyte can enter the recess. Because the recess is arranged opposite the at least one guide hole, the electrolyte entering the recess can directly enter the at least one guide hole. This ensures that during the process of injecting electrolyte into the battery cell through the injection hole, the electrolyte can enter the guide hole more easily and quickly, thereby improving the wetting effect of the electrolyte on the electrode assembly and improving the injection efficiency.

[0019] In some embodiments, the end cap has a liquid outlet surface located in the recess, one end of the liquid injection hole passes through the liquid outlet surface, and a gap is set between the liquid outlet surface and the outer surface.

[0020] In the above technical solution, a gap is set between the liquid outlet surface and the outer surface so that the injection hole and the recess are in a connected state, which facilitates the electrolyte to enter the recess from the injection hole, and is beneficial to the process of injecting electrolyte into the battery cell through the injection hole. The electrolyte flows along the guide hole to the interior of the main body.

[0021] In some embodiments, the guide channel includes a guide groove, which is provided on a side of the current collecting component facing the first electrode tab, and the first center hole is connected to the guide groove.

[0022] In the above technical solution, the flow guide groove is provided on the side of the current collecting member facing the first tab and is connected to the first central hole. The electrolyte entering the battery cell through the injection hole first enters the first central hole. A portion of the electrolyte then flows through the first central hole into the main body. The remaining portion of the electrolyte flows laterally along the flow guide groove, ultimately entering the main body from the flow guide groove. The flow guide groove increases the lateral flow range of the electrolyte, making it easier and faster for the electrolyte to enter the main body.

[0023] In some embodiments, the current collecting component includes: a main body portion, used to abut against the end cover, and a first center hole is arranged in the main body portion; two abutting portions, used to abut against the first pole ear, and the two abutting portions are both protruded on the side of the main body away from the end cover, and the two abutting portions are respectively located on both sides of the first center hole in the radial direction, and a guide groove is formed between the two abutting portions.

[0024] In the above technical solution, two abutment parts are protruding from the main body, and a guide groove is formed between the two abutment parts, so that a larger space for electrolyte flow is formed between the main body and the main body, increasing the range of lateral flow of electrolyte to better enter the electrode assembly.

[0025] In some embodiments, the abutting portion is in a "V" shape, with the two abutting portions facing each other.

[0026] In the above technical solution, the two abutting portions in a "V"-shaped structure are arranged back to back, so that the guide groove between the two abutting portions is a gradient structure with the smallest width at the position of the first center hole, which increases the flow range of the electrolyte in the guide groove, so that the electrolyte can enter the interior of the main body from multiple areas of the guide groove, making it easier and faster for the electrolyte to enter the main body.

[0027] In some embodiments, the first electrode tab is welded to the abutting portion to form a weld mark, and the weld mark extends along a trajectory of the abutting portion.

[0028] In the above technical solution, the weld mark extends along the trajectory of the abutting portion, so that the weld mark is also V-shaped, so that the entire abutting portion is tightly connected to the first electrode tab.

[0029] In some embodiments, the main body is provided with a second center hole, and the second center hole is arranged opposite to the first center hole in the axial direction of the first center hole.

[0030] In the above technical solution, the second center hole is arranged opposite to the first center hole. When the electrolyte is injected into the battery cell through the injection hole, the electrolyte entering the first center hole can quickly enter the first center hole to infiltrate the electrode.

[0031] In a second aspect, an embodiment of the present application provides a battery, comprising: a battery cell provided by any one embodiment of the first aspect; and a box for accommodating the battery cell.

[0032] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery provided by any embodiment of the first aspect.

[0033] In a fourth aspect, an embodiment of the present application provides a method for manufacturing a battery cell, the manufacturing method comprising: providing a shell having an opening; providing an electrode assembly, the electrode assembly comprising a main body and a first pole ear, the first pole ear protruding from one end of the main body; providing an end cover, the end cover being provided with an injection hole; providing a current collecting component, the current collecting component being provided with a first center hole and a guide channel; connecting the current collecting component to the first pole ear; accommodating the electrode assembly in the shell; closing the end cover on the opening; connecting the end cover to the current collecting component to achieve electrical connection between the end cover and the first pole ear; wherein the current collecting component is accommodated in the shell and is located on the side of the end cover facing the main body, and in the axial direction of the first center hole, the first center hole and the injection hole are arranged opposite to each other, and the guide channel is configured to allow at least part of the electrolyte entering the interior of the battery cell from the injection hole to enter the main body.

[0034] In a fifth aspect, an embodiment of the present application also provides a manufacturing device for a battery cell, the manufacturing device comprising: a first providing device for providing a shell having an opening; a second providing device for providing an electrode assembly, the electrode assembly comprising a main body and a first pole ear, the first pole ear protruding from one end of the main body; a third providing device for providing an end cover, the end cover being provided with an injection hole; a fourth providing device for providing a current collecting component, the current collecting component being provided with a first center hole and a guide channel; an assembling device for connecting the current collecting component to the first pole ear; and also for accommodating the electrode assembly in the shell; and also for closing the end cover on the opening; and also for connecting the end cover to the current collecting component to achieve electrical connection between the end cover and the pole ear; wherein the current collecting component is accommodated in the shell and is located on the side of the end cover facing the main body, and in the axial direction of the first center hole, the first center hole and the injection hole are arranged opposite to each other, and the guide channel is configured to allow at least part of the electrolyte entering the interior of the battery cell from the injection hole to enter the main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0037] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0038] Figure 3 An exploded view of a battery cell provided in some embodiments of the present application;

[0039] Figure 4 for Figure 3 A cross-sectional view of a battery cell is shown;

[0040] Figure 5 Figure 4 The structural schematic diagram of the current collecting component shown;

[0041] Figure 6 Schematic diagram of the structure of the current collecting component provided in other embodiments of the present application;

[0042] Figure 7 for Figure 4 A partial cross-sectional view of a battery cell is shown;

[0043] Figure 8 Partial cross-sectional views of battery cells provided in some other embodiments of the present application;

[0044] Figure 9 for Figure 8 The structural schematic diagram of the current collecting component shown;

[0045] Figure 10 A flowchart of a method for manufacturing a battery cell provided in some embodiments of the present application;

[0046] Figure 11 A schematic block diagram of a battery cell manufacturing device provided in some embodiments of the present application.

[0047] Icons: 10 - housing; 11 - first part; 12 - second part; 20 - battery cell; 21 - housing; 22 - electrode assembly; 221 - main body; 222 - first tab; 223 - second tab; 224 - second center hole; 23 - end cap; 231 - liquid injection hole; 232 - abutment surface; 233 - recessed portion; 2331 - bottom surface; 234 - liquid outlet surface; 235 - convex portion; 24 - current collecting member; 241 - first center hole; 242 - flow guide channel; 2421-guide hole; 2422-guide groove; 243-outer surface; 244-inner surface; 245-main body; 246-support part; 25-blocking part; 26-sealing part; 100-battery; 200-controller; 300-motor; 1000-vehicle; 2000-manufacturing equipment; 2100-first providing device; 2200-second providing device; 2300-third providing device; 2400-fourth providing device; 2500-assembly device. DETAILED DESCRIPTION

[0048] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0050] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0052] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0053] The term "plurality" used in this application refers to two or more (including two).

[0054] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0055] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0056] A battery cell comprises an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive active material layer protrudes from the positive electrode collector coated with the positive active material layer, and the positive electrode collector not coated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative active material layer protrudes from the negative electrode collector coated with the negative active material layer, and the negative electrode collector not coated with the negative active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, among others. To ensure that high currents can pass without fusing, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure, but the embodiments of the present application are not limited thereto.

[0057] For typical battery cells, the end caps need to be electrically connected to the tabs of the electrode assembly, allowing the end caps to function as an output terminal for the battery cell to output electrical energy. To better achieve this electrical connection, a current collecting member is typically installed between the electrode assembly and the end caps. Both the end caps and the tabs are connected to the current collecting member to achieve this electrical connection.

[0058] The inventors noticed that after the end cap and the electrode assembly are provided with a current collecting component, during the process of injecting electrolyte into the battery cell through the injection hole on the end cap, the current collecting component has a blocking effect on the electrolyte, making it difficult for the electrolyte to enter the battery cell and making it difficult for the electrolyte to infiltrate the electrode assembly.

[0059] To address the difficulty of electrolyte wetting the electrode assembly, the applicant discovered that a central hole could be provided in the current collecting member. During the process of injecting electrolyte into the battery cell through the injection hole, the electrolyte flows through the central hole in the current collecting member into the main body of the electrode assembly. However, the central hole in the current collecting member has limited flow conductivity, and the problem of electrolyte wetting the electrode assembly still remains.

[0060] Based on the above considerations, in order to solve the problem that it is difficult for the electrolyte to penetrate the electrode assembly, the inventors have designed a battery cell after in-depth research. On the basis of setting a central hole in the current collecting component, a guide channel is further set on the current collecting component. The guide channel can allow at least part of the electrolyte that enters the battery cell from the injection hole on the end cover to enter the main body of the electrode assembly.

[0061] In such a battery cell, the current collecting member is provided with a central hole and a flow channel. When electrolyte is injected into the battery cell through the injection hole, the electrolyte can not only flow along the central hole of the current collecting member into the interior of the main body, but also along the flow channel of the current collecting member into the interior of the main body to wet the electrode sheets. This structure increases the flow path for the electrolyte to flow into the interior of the main body, allowing the electrolyte entering the battery cell through the injection hole to more easily wet the electrode assembly, improving the injection efficiency and enhancing the electrolyte wetting effect on the electrode assembly.

[0062] The battery cells described in the embodiments of the present application are suitable for batteries and electrical equipment using the batteries.

[0063] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, 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. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0064] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0065] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000.

[0066] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0067] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of 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 2 This is a structural diagram of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20 . The box body 10 is used to accommodate the battery cell 20 .

[0069] The housing 10 is a component that houses the battery cells 20, providing a storage space for the battery cells 20. The housing 10 can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap to define a storage space for the battery cells 20. The first portion 11 and the second portion 12 can have various shapes, such as a rectangular parallelepiped or a cylinder. The first portion 11 can be a hollow structure with one side open, and the second portion 12 can also be a hollow structure with one side open. The open side of the second portion 12 overlaps the open side of the first portion 11, forming the housing 10 with a storage space. Alternatively, the first portion 11 can be a hollow structure with one side open, and the second portion 12 can be a plate-like structure. The second portion 12 overlaps the open side of the first portion 11, forming the housing 10 with a storage space. The first portion 11 and the second portion 12 can be sealed by a sealing element, such as a sealing ring, sealant, etc.

[0070] In the battery 100, there can be one or more battery cells 20. If there are multiple battery cells 20, the multiple battery cells 20 can be connected in series, parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. Multiple battery cells 20 can be connected in series, parallel, or in a hybrid connection to form a battery module, which is then connected in series, parallel, or in a hybrid connection to form a whole and housed within the housing 10. Alternatively, all battery cells 20 can be directly connected in series, parallel, or in a hybrid connection, and then the whole battery module can be housed within the housing 10.

[0071] In some embodiments, the battery 100 may further include a busbar component, through which the multiple battery cells 20 can be electrically connected to each other, thereby enabling series connection, parallel connection, or hybrid connection of the multiple battery cells 20. The busbar component may be a metal conductor, such as copper, iron, aluminum, stainless steel, or aluminum alloy.

[0072] Please refer to Figure 3 , Figure 3 This is an exploded view of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 may include a housing 21 , an electrode assembly 22 , an end cover 23 and a current collecting member 24 .

[0073] The shell 21 is a component for accommodating the electrode assembly 22. The shell 21 can be a hollow structure with an opening at one end, or a hollow structure with openings at both ends. The shell 21 can be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The shell 21 can be in a variety of shapes, such as a cylinder, a cuboid, etc. For example, in Figure 3 In the embodiment, the housing 21 is a cylinder.

[0074] The electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The electrode assembly 22 may include a main body 221, a first electrode tab 222, and a second electrode tab 223. The first electrode tab 222 and the second electrode tab 223 both protrude from one end of the main body 221. Of course, the first electrode tab 222 and the second electrode tab 223 may be located at the same end of the main body 221, or respectively at opposite ends of the main body 221. One of the first electrode tab 222 and the second electrode tab 223 is a positive electrode tab, and the other is a negative electrode tab. The main body 221 may include a positive electrode sheet, a negative electrode sheet, and a separator. The main body 221 may be a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet. The main body 221 may also be a laminated structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet.

[0075] The positive electrode sheet includes a positive current collector and a positive active material layer coated on opposite sides of the positive current collector. The negative electrode sheet also includes a negative current collector and a negative active material layer coated on opposite sides of the negative current collector. The main body 221 is the portion of the electrode assembly 22 corresponding to the area of ​​the electrode sheet coated with the active material layer. The positive electrode tab is the portion of the positive electrode sheet not coated with the positive active material layer, and the negative electrode tab is the portion of the negative electrode sheet not coated with the negative active material layer.

[0076] The end cap 23 is a component that covers the opening of the shell 21 to isolate the internal environment of the battery cell 20 from the external environment. The end cap 23 covers the opening of the shell 21, and the end cap 23 and the shell 21 together define a sealed space for accommodating the electrode assembly 22, electrolyte, and other components. The shape of the end cap 23 can be adapted to the shape of the shell 21. For example, if the shell 21 is a rectangular parallelepiped structure, the end cap 23 is a rectangular plate structure that is adapted to the shell 21. For another example, if the shell 21 is a cylindrical structure, the end cap 23 is a circular plate structure that is adapted to the shell 21. The material of the end cap 23 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0077] In the battery cell 20, there can be one or two end caps 23, and the number of end caps 23 can be determined based on the specific structure of the housing 21. For example, if the housing 21 is a hollow structure with an opening at one end, one end cap 23 can be provided. For another example, if the housing 21 is a hollow structure with openings at two opposite ends, two end caps 23 can be provided, with the two end caps 23 covering the two openings of the end cap 23 respectively.

[0078] The current collecting member 24 is a component that enables electrical connection between the end cap 23 and the tab. In a battery cell 20, there can be one or two current collecting members 24. In an embodiment where there is only one end cap 23 in a battery cell 20, one current collecting member 24 can be provided accordingly. The first tab 222 can be connected to the end cap 23 via the current collecting member 24, and the second tab 223 can be connected to the housing 21, so that the housing 21 and the end cap 23 respectively serve as the two output poles of the battery cell 20 to output electrical energy. In an embodiment where there are two end caps 23 in a battery cell 20, two current collecting members 24 can be provided accordingly. The first tab 222 can be connected to the end cap 23 via one current collecting member 24, and the second tab 223 can be connected to the end cap 23 via another current collecting member 24, so that the two end caps 23 respectively serve as the two output poles of the battery cell 20 to output electrical energy.

[0079] Please refer to Figure 4 , Figure 4 for Figure 3The cross-sectional view of the battery cell 20 shown in the figure, an embodiment of the present application provides a battery cell 20, the battery cell 20 includes a shell 21, an electrode assembly 22, an end cover 23 and a current collecting member 24. The shell 21 has an opening. The electrode assembly 22 is accommodated in the shell 21, and the electrode assembly 22 includes a main body 221 and a first pole tab 222, and the first pole tab 222 protrudes from one end of the main body 221. The end cover 23 covers the opening, and the end cover 23 is provided with a liquid injection hole 231. The current collecting member 24 is accommodated in the shell 21 and is located on the side of the end cover 23 facing the main body 221. The current collecting member 24 is used to connect the first pole tab 222 and the end cover 23 to achieve electrical connection between the end cover 23 and the first pole tab 222. Among them, the current collecting component 24 is provided with a first center hole 241 and a guide channel 242. In the axial direction of the first center hole 241, the first center hole 241 is arranged opposite to the injection hole 231, and the guide channel 242 is configured to allow at least part of the electrolyte entering the interior of the battery cell 20 from the injection hole 231 to enter the main body 221.

[0080] The injection hole 231 on the end cap 23 can be a circular hole. A sealing member 25 can be provided on the end cap 23 to seal the injection hole 231. After electrolyte is injected into the battery cell 20 through the injection hole 231, the sealing member 25 seals the injection hole 231. The end cap 23 and the housing 21 can be sealed together by a sealing member 26, which can be made of rubber, plastic, or other materials.

[0081] The current collecting member 24 is a conductor and can be made of copper, iron, aluminum, steel, or an aluminum alloy. It is connected to both the first electrode tab 222 and the end cap 23 to achieve electrical connection between the two. The connection between the current collecting member 24 and the first electrode tab 222 can be non-fixed, for example, by simply maintaining abutting contact. Alternatively, the connection can be fixed, for example, by welding. The connection between the current collecting member 24 and the end cap 23 can be non-fixed, for example, by simply maintaining abutting contact. Alternatively, the connection can be fixed, for example, by welding. The first electrode tab 222 connected to the current collecting member 24 can be either a positive electrode tab or a negative electrode tab. The first electrode tab 222 may be an annular structure, and the first electrode tab 222 may be coaxially disposed with the main body 221 .

[0082] The first center hole 241 is a through hole located at the center of the current collecting member 24. For example, if the current collecting member 24 is a disc, the axis of the first center hole 241 coincides with the axis of the current collecting member 24. The first center hole 241 and the injection hole 231 are arranged axially opposite each other. The first center hole 241 and the injection hole 231 can be coaxial, or the axis of the first center hole 241 can be slightly offset from the axis of the injection hole 231. As long as the first center hole 241 and the injection hole 231 are not completely offset in the radial direction of the first center hole 241, it should be understood that the first center hole 241 and the injection hole 231 are arranged axially opposite each other.

[0083] The flow guide channel 242 is a channel on the current collecting member 24 that is distinct from the first center hole 241. The flow guide channel 242 can be disposed around the first center hole 241, independent of the first center hole 241; alternatively, the flow guide channel 242 can be connected to the first center hole 241. The flow guide channel 242 can be a through hole extending through the outer surface 243 and inner surface 244 of the current collecting member 24, or a groove disposed on the outer surface 243 or inner surface 244 of the current collecting member 24. The outer surface 243 of the current collecting member 24 refers to the surface of the current collecting member 24 facing the end cap 23 in the thickness direction, while the inner surface 244 of the current collecting member 24 refers to the surface of the current collecting member 24 facing the first electrode tab 222 in the thickness direction. There can be one or more flow guide channels 242. In the case of multiple flow guide channels 242, for example, multiple flow guide channels 242 can be distributed around the first center hole 241.

[0084] The current collecting member 24 is provided with a first central hole 241 and a flow channel 242. When electrolyte is injected into the battery cell 20 through the injection hole 231, the electrolyte can flow not only along the first central hole 241 of the current collecting member 24 into the interior of the main body 221, but also along the flow channel 242 of the current collecting member 24 into the interior of the main body 221 to wet the electrode sheets. This structure increases the flow path for the electrolyte to flow into the interior of the main body 221, allowing the electrolyte entering the battery cell 20 through the injection hole 231 to more easily wet the electrode assembly 22, thereby improving injection efficiency and enhancing the wetting effect of the electrolyte on the electrode assembly 22.

[0085] In some embodiments, please refer to Figure 4 and Figure 5 , Figure 5 Figure 4 The schematic structural diagram of the current collecting member 24 is shown. The current collecting member 24 has an outer surface 243 and an inner surface 244 facing each other. The outer surface 243 faces the end cap 23, and the inner surface 244 faces the first electrode tab 222. The flow guide channel 242 includes a flow guide hole 2421 that passes through the outer surface 243 and the inner surface 244 of the current collecting member 24.

[0086] The outer surface 243 of the current collecting member 24 can abut against the end cap 23, maintaining contact between the current collecting member 24 and the end cap 23. The inner surface 244 of the current collecting member 24 can abut against the first electrode tab 222, maintaining contact between the first electrode tab 222 of the current collecting member 24. For example, to further improve the stability of the contact between the current collecting member 24 and the end cap 23, and between the current collecting member 24 and the first electrode tab 222, the current collecting member 24 can be welded to the first electrode tab 222, and the current collecting member 24 can be welded to the end cap 23.

[0087] The flow guide hole 2421 is a through hole that passes through the outer surface 243 and the inner surface 244 of the current collecting member 24. The flow guide hole 2421 can be a hole of various shapes, such as a circular hole, a square hole, an elongated hole, an arc hole, etc. The flow guide hole 2421 in the flow guide channel 242 can be one or more.

[0088] In this embodiment, since the guide hole 2421 passes through the outer surface 243 and the inner surface 244 of the current collecting component 24, the electrolyte that enters the battery cell 20 through the injection hole 231 can directly flow from the side of the current collecting component 24 facing the end cover 23 to the side facing the main body 221 through the guide hole 2421, so that the electrolyte enters the interior of the main body 221 to infiltrate the electrode.

[0089] In some embodiments, please refer to Figure 5 The guide hole 2421 deviates from the first central hole 241 so as to be independent of the first central hole 241 .

[0090] The guide hole 2421 deviates from the first central hole 241 , that is, there is a certain distance between the guide hole 2421 and the first central hole 241 , so that the guide hole 2421 and the first central hole 241 are independent of each other.

[0091] like Figure 5 As shown, when there are multiple guide holes 2421 in the guide channel 242, multiple guide holes 2421 can be provided along the radial direction of the first central hole 241 and multiple guide holes can be provided along the circumferential direction of the first central hole 241. Exemplarily, the guide holes 2421 are circular holes.

[0092] In this embodiment, since the guide hole 2421 deviates from the first central hole 241 , it is convenient for the forming process of the guide hole 2421 , and the current collecting component 24 has better strength.

[0093] In some embodiments, please refer to Figure 6 , Figure 6 This is a structural schematic diagram of the current collecting component 24 provided in some other embodiments of the present application, where the guide hole 2421 passes through the hole wall of the first central hole 241 .

[0094] The guide hole 2421 passes through the wall of the first central hole 241 and is in communication with the first central hole 241. For example, if the guide hole 2421 is a strip hole or an arc hole, the guide hole 2421 passes through the wall of the first central hole 241 at one end thereof.

[0095] In the case where there are multiple guide holes 2421 in the guide channel 242 , multiple guide holes 2421 may be provided along the circumference of the first central hole 241 .

[0096] In this embodiment, the flow guide hole 2421 is in communication with the first center hole 241, allowing the electrolyte to flow between the flow guide hole 2421 and the first center hole 241. If the electrolyte that has entered the flow guide hole 2421 is unable to enter the main body 221 in a timely manner, the electrolyte can flow from the flow guide hole 2421 into the first center hole 241, and then enter the main body 221 through the first center hole 241. If the electrolyte that has entered the first center hole 241 is unable to enter the main body 221 in a timely manner, the electrolyte can flow from the first center hole 241 into the flow guide hole 2421, and then enter the main body 221 through the flow guide hole 2421.

[0097] In some embodiments, please refer to Figure 6 , the guide hole 2421 extends along the radial direction of the first central hole 241 .

[0098] It can be understood that the guide hole 2421 is an elongated hole, and the extending direction of the guide hole 2421 is consistent with the radial direction of the first central hole 241 .

[0099] In this embodiment, since the guide hole 2421 extends radially along the first center hole 241, the electrolyte can flow radially along the first center hole 241 in the guide hole 2421, thereby increasing the flow range of the electrolyte in the guide hole 2421, and allowing the electrolyte to enter the interior of the main body 221 from multiple areas of the guide hole 2421, thereby improving the injection efficiency and the infiltration effect of the electrolyte on the electrode assembly 22.

[0100] In some embodiments, please refer to Figure 5 and Figure 6 The flow channel 242 includes a plurality of flow holes 2421, which are circumferentially spaced around the first central hole 241. This structure allows the electrolyte to flow along the plurality of flow holes 2421 into the interior of the main body 221, thereby improving the injection efficiency and the electrolyte's infiltration effect on the electrode assembly 22.

[0101] In some embodiments, please refer to Figure 7 , Figure 7 for Figure 4In the partial cross-sectional view of the battery cell 20 shown, the end cap 23 has an abutment surface 232, which is configured to abut against the outer surface 243. A recess 233 is provided on the end cap 23. The recess 233 is recessed away from the abutment surface 232 and away from the main body 221. The recess 233 communicates with the liquid injection hole 231 and is disposed opposite the at least one guide hole 2421 in the axial direction of the first central hole 241.

[0102] The abutment surface 232 is the surface of the end cap 23 that abuts against the outer surface 243 of the current collecting member 24. The recess 233 is a recessed space on the end cap 23 that is recessed from the abutment surface 232 in a direction away from the main body 221. The recess 233 can be a circular groove coaxially arranged with the injection hole 231.

[0103] The recess 233 is connected to the injection hole 231. The recess 233 and the injection hole 231 can be axially connected, for example, the recess 233 and the injection hole 231 together form a stepped hole, and one axial end of the injection hole 231 is connected to one axial end of the recess 233; or the recess 233 and the injection hole 231 can be radially connected, for example, the injection hole 231 is at least partially located on the inner side of the recess 233, and the two are connected through radially arranged channels.

[0104] It should be noted that, as long as the recess 233 and the at least one guide hole 2421 are not completely offset in the radial direction of the first central hole 241, it should be understood that the recess 233 and the at least one guide hole 2421 are arranged opposite each other in the axial direction of the first central hole 241. It can also be understood that the recess 233 covers part or all of the at least one guide hole 2421 in the axial direction of the first central hole 241.

[0105] like Figure 5 As shown, in the embodiment where the guide hole 2421 deviates from the first central hole 241 and the guide holes 2421 are distributed in a plurality along the circumference of the first central hole 241, the recess 233 ( Figure 5 (not shown) can be arranged opposite to all the guide holes 2421, or can be arranged opposite to some of the guide holes 2421. Figure 6 As shown, in the embodiment where the guide hole 2421 passes through the hole wall of the first central hole 241 and the guide holes 2421 are distributed in a plurality along the circumference of the first central hole 241, the recess 233 ( Figure 6 (not shown) can be arranged opposite to all the guide holes 2421, and can also be arranged opposite to some of the guide holes 2421.

[0106] In this embodiment, the recess 233 is connected to the injection hole 231. During the process of injecting electrolyte into the battery cell 20 through the injection hole 231, the electrolyte can enter the recess 233. Because the area where the recess 233 is located covers at least a portion of the guide hole 2421, the electrolyte entering the recess 233 can directly enter at least one guide hole 2421. This ensures that during the process of injecting electrolyte into the battery cell 20 through the injection hole 231, the electrolyte can enter the guide hole 2421 more easily and quickly, thereby improving the electrolyte's infiltration effect on the electrode assembly 22 and improving the injection efficiency.

[0107] In some embodiments, please refer to Figure 7 The end cover 23 has a liquid outlet surface 234 located in the recess 233 , one end of the liquid injection hole 231 passes through the liquid outlet surface 234 , and a gap is set between the liquid outlet surface 234 and the outer surface 243 .

[0108] A gap is set between the liquid outlet surface 234 and the outer surface 243 . The liquid outlet surface 234 and the outer surface 243 are not in contact with each other, but there is a gap between them. The electrolyte can flow into the recess 233 through the gap.

[0109] Exemplarily, the recess 233 has a bottom surface 2331 facing the outer surface 243, and a protrusion 235 is protruding from the bottom surface 2331. The end of the protrusion 235 facing the outer surface 243 forms a liquid outlet surface 234. A gap exists between the outer peripheral surface of the protrusion 235 and the inner peripheral surface of the recess 233 to accommodate the electrolyte. The injection hole 231 is disposed within the protrusion 235. The provision of the protrusion 235 can enhance the strength of the end cap 23 at the location where the injection hole 231 is provided. Among them, the bottom surface 2331 is the surface of the recess 233 farthest from the outer surface 243, the outer peripheral surface is the surface of the protrusion 235 connecting the bottom surface 2331 and the liquid outlet surface 234, and the inner peripheral surface is the surface of the recess 233 connecting the bottom surface 2331 and the abutment surface 232.

[0110] In this embodiment, a gap is set between the liquid outlet surface 234 and the outer surface 243, so that the injection hole 231 and the recess 233 are in a connected state, which facilitates the electrolyte to enter the first recess 233 from the injection hole 231, and is beneficial for the electrolyte to flow along the guide hole 2421 to the interior of the main body 221 during the process of injecting electrolyte into the battery cell 20 through the injection hole 231.

[0111] In some embodiments, please refer to Figure 8 and Figure 9 , Figure 8 Partial cross-sectional views of battery cells 20 provided in some other embodiments of the present application are shown. Figure 9 for Figure 8As shown in the structural diagram of the current collecting component 24 , the guide channel 242 includes a guide groove 2422 . The guide groove 2422 is provided on a side of the current collecting component 24 facing the first electrode tab 222 , and the first center hole 241 is in communication with the guide groove 2422 .

[0112] The guide groove 2422 can have various shapes, such as a strip groove, a circular groove, a fan-shaped groove, etc. The guide groove 2422 in the guide channel 242 can be one or more. Taking the example of a plurality of guide grooves 2422 in the guide channel 242, the plurality of guide grooves 2422 can be circumferentially spaced around the first central hole 241.

[0113] In the case where the flow guiding channel 242 includes the flow guiding groove 2422, the flow guiding channel 242 may also include the flow guiding hole 2421 in the aforementioned embodiments, that is, the flow guiding channel 242 may only have the flow guiding groove 2422 or the flow guiding hole 2421, or may have both the flow guiding groove 2422 and the flow guiding hole 2421. Figure 9 In the flow guiding channel 242 , only the flow guiding groove 2422 is provided.

[0114] The guide groove 2422 is provided on the side of the current collecting member 24 facing the first electrode tab 222 and is connected to the first central hole 241. The electrolyte entering the battery cell 20 through the injection hole 231 first enters the first central hole 241. A portion of the electrolyte enters the main body 221 through the first central hole 241, while the remaining portion flows laterally along the guide groove 2422, ultimately entering the main body 221 from the guide groove 2422. The guide groove 2422 increases the lateral flow range of the electrolyte, allowing the electrolyte to enter the main body 221 more easily and quickly.

[0115] In some embodiments, please refer to Figure 9 The current collecting member 24 includes a main body 245 and abutting portion 246. The main body 245 is used to abut against the end cover 23 ( Figure 9 (not shown), the first center hole 241 is provided in the main body 245. The two abutting portions 246 are used to abut against the first tab 222 ( Figure 9 (not shown), the two abutting portions 246 are both protruding from the side of the main body 245 away from the end cover 23, and the two abutting portions 246 are respectively located on both sides of the first center hole 241 in the radial direction, and a guide groove 2422 is formed between the two abutting portions 246.

[0116] The body portion 245 is the main portion of the current collecting member 24, and the abutting portion 246 is the portion of the current collecting member 24 that protrudes from the body portion 245. The body portion 245 and the abutting portion 246 may be integrally formed. The body portion 245 abuts against the end cap 23, maintaining contact between the body portion 245 and the end cap 23. The abutting portion 246 abuts against the first electrode tab 222, maintaining contact between the abutting portion 246 and the first electrode tab 222. For example, to further enhance the stability of the contact between the current collecting member 24 and the end cap 23, and between the current collecting member 24 and the first electrode tab 222, the abutting portion 246 may be welded to the first electrode tab 222, and the body portion 245 may be welded to the end cap 23.

[0117] Exemplarily, the main body 245 is a disc structure, and the first center hole 241 is disposed at the center of the main body 245 .

[0118] In an embodiment where the guide channel 242 also includes a guide hole 2421, the guide hole 2421 and the guide groove 2422 can be independent of each other or can be connected to each other. Taking the connection between the guide hole 2421 and the guide groove 2422 as an example, the guide hole 2421 can be set in the main body 245, and the guide hole 2421 passes through the surface of the main body 245 away from the end cover 23, so that the guide hole 2421 is connected to the guide groove 2422.

[0119] In this embodiment, two abutment portions 246 are protruding from the main body portion 245 , and a guide groove 2422 is formed between the two abutment portions 246 , so that a larger space for electrolyte flow is formed between the main body portion 245 and the main body portion 221 , thereby increasing the range of lateral flow of the electrolyte and better allowing it to enter the electrode assembly 22 .

[0120] In addition, the abutting portion 246 protrudes from the main body 245 , which makes it easier to ensure the flatness of the surface of the abutting portion 246 abutting against the first electrode tab 222 , so that the abutting portion 246 and the first electrode tab 222 can maintain good contact.

[0121] In some embodiments, please refer to Figure 9 The abutting portion 246 is in a “V” shape, and the two abutting portions 246 are arranged back to back.

[0122] Since the abutting portion 246 is V-shaped, the abutting portion 246 has a tip and an open end, and in the radial direction of the first central hole 241, the tip is closer to the first central hole 241 than the open end. The two abutting portions 246 are arranged back to back, which means that the open ends of the two abutting portions 246 are arranged back to back.

[0123] In this embodiment, the two abutting portions 246 in a "V" shape are arranged back to back, so that the guide groove 2422 between the two abutting portions 246 is a gradient structure with the smallest width at the position of the first center hole 241, thereby increasing the flow range of the electrolyte in the guide groove 2422, so that the electrolyte can enter the interior of the main body 221 from multiple areas of the guide groove 2422, making it easier and faster for the electrolyte to enter the main body 221.

[0124] In addition, since the abutment portion 246 has a "V"-shaped structure, the contact range between the current collecting component 24 and the first pole ear 222 in the radial direction of the first center hole 241 is increased, so that the current collecting component 24 can abut against both the inner circle part of the first pole ear 222 and the outer circle part of the first pole ear 222, and polarization is less likely to occur.

[0125] In some embodiments, the first tab 222 ( Figure 8 ) is welded to the abutment portion 246 and forms a weld mark, which extends along the trajectory of the abutment portion 246.

[0126] A weld mark forms where the first tab 222 and the abutting portion 246 are welded together. Because the abutting portion 246 is V-shaped, the weld mark extends along the path of the abutting portion 246, also forming a V-shape. This structure ensures a tight connection between the entire abutting portion 246 and the first tab 222, reducing polarization.

[0127] In some embodiments, please refer to Figure 7 and Figure 8 The main body 221 defines a second center hole 224 , and the second center hole 224 is disposed opposite to the first center hole 241 in the axial direction of the first center hole 241 .

[0128] Taking the winding structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet as an example, the second center hole 224 is formed at the winding core of the main body 221 .

[0129] It should be noted that, as long as the second center hole 224 and the first center hole 241 are not completely offset in the radial direction of the first center hole 241, it should be understood that the second center hole 224 and the first center hole 241 are arranged relative to each other in the axial direction of the first center hole 241. Of course, the second center hole 224 and the first center hole 241 can be arranged coaxially, or the axis of the second center hole 224 can be slightly offset from the axis of the first center hole 241. For example, in Figure 7 and Figure 8 In the embodiment, the second center hole 224, the first center hole 241 and the injection hole 231 are coaxially arranged.

[0130] In this embodiment, the second center hole 224 is arranged opposite to the first center hole 241. When the electrolyte is injected into the battery cell 20 through the injection hole 231, the electrolyte entering the first center hole 241 can quickly enter the first center hole 241 to infiltrate the electrode.

[0131] An embodiment of the present application provides a battery 100 , comprising a housing 10 and a battery cell 20 provided in any one of the above embodiments. The housing 10 is used to accommodate the battery cell 20 .

[0132] An embodiment of the present application provides an electrical device, comprising the battery 100 provided in any one of the above embodiments.

[0133] In addition, please refer to Figure 3 and Figure 4 The present invention provides a cylindrical battery comprising a housing 21, an electrode assembly 22, an end cap 23, and a current collecting member 24. The electrode assembly 22 comprises a main body 221 and a first electrode tab 222 and a second electrode tab 223 of opposite polarity. The first electrode tab 222 and the second electrode tab 223 protrude from the main body 221 and are located at opposite ends of the main body 221. The first electrode tab 222 is connected to the end cap 23 via the current collecting member 24, while the second electrode tab 223 is connected to the housing 21. The current collecting member 24 is provided with a first central hole 241 and a flow guide channel 242. In the axial direction of the first central hole 241, the first central hole 241 is arranged opposite the liquid injection hole 231 in the end cap 23 and opposite the second central hole 224 in the main body 221. The flow guide channel 242 is configured to allow at least a portion of the electrolyte that enters the interior of the battery cell 20 through the liquid injection hole 231 to enter the main body 221.

[0134] In such a cylindrical battery, a first center hole 241 and a guide channel 242 are provided on the current collecting component 24. During the process of injecting electrolyte into the battery cell 20 through the injection hole 231, the electrolyte can not only flow along the first center hole 241 of the current collecting component 24 to the inside of the main body 221, but also flow along the guide channel 242 of the current collecting component 24 to the inside of the main body 221, so that the electrolyte entering the battery cell 20 through the injection hole 231 can more easily infiltrate the electrode assembly 22, thereby improving the injection efficiency and the wetting effect of the electrolyte on the electrode assembly 22.

[0135] Please refer to Figure 10 , Figure 10 This is a flow chart of a method for manufacturing a battery cell 20 provided in some embodiments of the present application. The present application provides a method for manufacturing a battery cell 20, and the manufacturing method includes:

[0136] S100: Providing a housing 21, wherein the housing 21 has an opening;

[0137] S200: Providing an electrode assembly 22, the electrode assembly 22 comprising a main body 221 and a first electrode tab 222, the first electrode tab 222 protruding from one end of the main body 221;

[0138] S300: Providing an end cap 23, wherein the end cap 23 is provided with a liquid injection hole 231;

[0139] S400: Providing a current collecting component 24, wherein the current collecting component 24 is provided with a first central hole 241 and a flow guiding channel 242;

[0140] S500: Connecting the current collecting component 24 to the first electrode tab 222;

[0141] S600: accommodating the electrode assembly 22 in the housing 21;

[0142] S700: Cover the end cover 23 on the opening;

[0143] S800 : Connect the end cap 23 to the current collecting member 24 to achieve electrical connection between the end cap 23 and the first electrode tab 222 .

[0144] Among them, the current collecting component 24 is accommodated in the shell 21 and is located on the side of the end cover 23 facing the main body 221. In the axial direction of the first center hole 241, the first center hole 241 is arranged opposite to the injection hole 231, and the guide channel 242 is configured to allow at least part of the electrolyte entering the interior of the battery cell 20 from the injection hole 231 to enter the main body 221.

[0145] In the above method, the order of step S100, step S200, step S300 and step S400 is not limited. For example, step S400 may be performed first, then step S300, then step S200, and finally step S100.

[0146] In addition, in the above method, the order of step S500 and step S600 is not limited. For example, step S600 can be performed first, and then step S500.

[0147] It should be noted that the relevant structure of the battery cell 20 manufactured by the manufacturing method provided by the above embodiment can refer to the battery cell 20 provided by the above embodiments, and will not be repeated here.

[0148] Please refer to Figure 11 , Figure 11 This is a schematic block diagram of a manufacturing device 2000 for a battery cell 20 provided in some embodiments of the present application. The embodiments of the present application also provide a manufacturing device 2000 for a battery cell 20, and the manufacturing device 2000 includes a first providing device 2100, a second providing device 2200, a third providing device 2300, a fourth providing device 2400 and an assembling device 2500.

[0149] The first providing device 2100 is used to provide a shell 21 having an opening. The second providing device 2200 is used to provide an electrode assembly 22, which includes a main body 221 and a first electrode tab 222, the first electrode tab 222 protruding from one end of the main body 221. The third providing device 2300 is used to provide an end cap 23, which is provided with a liquid injection hole 231. The fourth providing device 2400 is used to provide a current collecting member 24, which is provided with a first center hole 241 and a flow guide channel 242. The assembly device 2500 is used to connect the current collecting member 24 to the first electrode tab 222; it is also used to accommodate the electrode assembly 22 in the shell 21; the assembly device 2500 is also used to cover the opening with the end cap 23; the assembly device 2500 is also used to connect the end cap 23 to the current collecting member 24 to achieve electrical connection between the end cap 23 and the electrode tab.

[0150] Among them, the current collecting component 24 is accommodated in the shell 21 and is located on the side of the end cover 23 facing the main body 221. In the axial direction of the first center hole 241, the first center hole 241 is arranged opposite to the injection hole 231, and the guide channel 242 is configured to allow at least part of the electrolyte entering the interior of the battery cell 20 from the injection hole 231 to enter the main body 221.

[0151] It should be noted that the relevant structures of the battery cells 20 manufactured by the manufacturing equipment 2000 provided by the above embodiment can refer to the battery cells 20 provided by the above embodiments, and will not be repeated here.

[0152] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0153] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. A battery cell, characterized in that: include: a housing having an opening; an electrode assembly housed in the housing, the electrode assembly comprising a main body and a first tab, the main body being a wound structure, the first tab protruding from one end of the main body; an end cover, covering the opening, and provided with a liquid injection hole; a current collecting member housed in the housing and located on a side of the end cap facing the main body, the current collecting member being used to connect the first electrode tab and the end cap to achieve electrical connection between the end cap and the first electrode tab, the current collecting member having an outer surface and an inner surface facing each other, the outer surface facing the end cap, and the inner surface facing the first electrode tab; In which, the current collecting component is provided with a first center hole and a guide channel. In the axial direction of the first center hole, the first center hole is arranged opposite to the injection hole, and the guide channel is configured to allow at least part of the electrolyte entering the battery cell from the injection hole to enter the main body. The guide channel includes a guide hole, and the guide hole passes through the outer surface and the inner surface of the current collecting component. The end cover has a rest surface, and the rest surface is used to rest against the outer surface. A recess is provided on the end cover, and the recess is recessed from the rest surface in a direction away from the main body. The recess is connected to the injection hole. In the axial direction of the first center hole, the recess is arranged opposite to at least one of the guide holes.

2. The battery cell according to claim 1, wherein: The guide hole deviates from the first central hole so as to be independent of the first central hole.

3. The battery cell according to claim 1, wherein: The guide hole passes through the hole wall of the first central hole.

4. The battery cell according to claim 3, characterized in that The guide hole extends radially of the first central hole.

5. The battery cell according to claim 1, characterized in that The guide channel includes a plurality of guide holes, and the plurality of guide holes are circumferentially spaced and distributed around the first central hole.

6. The battery cell according to claim 1, characterized in that The end cover has a liquid outlet surface located in the recess, one end of the liquid injection hole passes through the liquid outlet surface, and a gap is set between the liquid outlet surface and the outer surface.

7. The battery cell according to claim 1, characterized in that The guide channel includes a guide groove, which is provided on a side of the current collecting component facing the first electrode tab, and the first center hole is communicated with the guide groove.

8. The battery cell according to claim 7, characterized in that The current collecting component comprises: a main body portion, configured to abut against the end cover, wherein the first center hole is provided in the main body portion; Two abutting portions are used to abut against the first pole ear. Both of the abutting portions are protruding from the side of the main body away from the end cover. The two abutting portions are respectively located on both sides of the first center hole in the radial direction, and the guide groove is formed between the two abutting portions.

9. The battery cell according to claim 8, characterized in that The abutting portion is in a "V" shape, and the two abutting portions are arranged back to back.

10. The battery cell according to claim 8, characterized in that The first electrode tab is welded to the abutting portion to form a weld mark, and the weld mark extends along a trajectory of the abutting portion.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The main body is provided with a second center hole. In the axial direction of the first center hole, the second center hole is arranged opposite to the first center hole.

12. A battery, characterized in that: include: The battery cell according to any one of claims 1 to 11; The box is used to accommodate the battery cells.

13. An electrical device, characterized in that: Including the battery according to claim 12.

14. A method for manufacturing a battery cell, characterized in that: The manufacturing method comprises: providing a housing having an opening; Providing an electrode assembly, the electrode assembly comprising a main body and a first electrode tab, wherein the first electrode tab protrudes from one end of the main body; Providing an end cap, wherein the end cap is provided with a liquid injection hole; Providing a current collecting component, wherein the current collecting component is provided with a first central hole and a flow guide channel, and the current collecting component further has an outer surface and an inner surface facing each other, wherein the outer surface faces the end cover, and the inner surface faces the first electrode tab; connecting the current collecting member to the first electrode tab; accommodating the electrode assembly in the housing; Covering the opening with an end cap; Connecting the end cap to the current collecting member to achieve electrical connection between the end cap and the first electrode tab; In which, the current collecting component is accommodated in the shell and is located on the side of the end cover facing the main body. In the axial direction of the first center hole, the first center hole is arranged opposite to the injection hole, and the diversion channel is configured to allow at least part of the electrolyte entering the battery cell from the injection hole to enter the main body. The diversion channel includes a diversion hole, which passes through the outer surface and inner surface of the current collecting component. The end cover has a resting surface, which is used to rest against the outer surface. A recess is provided on the end cover, which is recessed from the resting surface in a direction away from the main body. The recess is connected to the injection hole. In the axial direction of the first center hole, the recess is arranged opposite to at least one of the diversion holes.

15. A battery cell manufacturing device, characterized in that: The manufacturing equipment includes: A first providing device is used to provide a housing, wherein the housing has an opening; A second providing device is used to provide an electrode assembly, wherein the electrode assembly includes a main body and a first electrode tab, wherein the first electrode tab protrudes from one end of the main body; A third providing device is used to provide an end cap, wherein the end cap is provided with a liquid injection hole; A fourth providing device is configured to provide a current collecting member, wherein the current collecting member is provided with a first central hole and a flow guiding channel, and further comprises an outer surface and an inner surface facing each other, wherein the outer surface faces the end cover, and the inner surface faces the first electrode tab; An assembly device for connecting the current collecting member to the first electrode tab; further for accommodating the electrode assembly in the housing; further for closing the end cover on the opening; and further for connecting the end cover to the current collecting member to achieve electrical connection between the end cover and the first electrode tab; In which, the current collecting component is accommodated in the shell and is located on the side of the end cover facing the main body. In the axial direction of the first center hole, the first center hole is arranged opposite to the injection hole, and the diversion channel is configured to allow at least part of the electrolyte entering the battery cell from the injection hole to enter the main body. The diversion channel includes a diversion hole, which passes through the outer surface and inner surface of the current collecting component. The end cover has a resting surface, which is used to rest against the outer surface. A recess is provided on the end cover, which is recessed from the resting surface in a direction away from the main body. The recess is connected to the injection hole. In the axial direction of the first center hole, the recess is arranged opposite to at least one of the diversion holes.

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