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

Abstract

The present application discloses a battery cell, a battery, an electrical device, and a method and apparatus for manufacturing the battery cell. The battery cell comprises: an electrode assembly, comprising a first electrode tab and a second electrode tab with opposite polarities, located at both axial ends of the electrode assembly, the electrode assembly having a winding center hole; a housing assembly, the electrode assembly being disposed therein, the first electrode lead portion and the second electrode lead portion of the housing assembly being disposed on a side of the housing assembly axially adjacent to the first electrode tab, the first electrode lead portion being electrically connected to the first electrode tab; an adapter, disposed through the winding center hole, for electrically connecting the second electrode tab to the second electrode lead portion; a first insulating member, disposed at one end of the electrode assembly where the first electrode tab is disposed and having a through hole for the adapter to pass through, for insulating and isolating the first electrode tab from the second electrode lead portion; a second insulating member, sleeved on the adapter and disposed between the outer circumference of the adapter and the inner wall of the winding center hole; one end of the second insulating member abutting the first insulating member.

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] In the pursuit of energy conservation and emission reduction, batteries are widely used in electrical devices such as mobile phones, computers, and electric vehicles to provide power. With the continuous development of technology, batteries are required to be more compact and safer. However, more compact battery structures are prone to short circuits caused by components with opposite polarity. Therefore, it is difficult to strike a balance between a more compact structure and battery safety. Summary of the Invention

[0003] The present application aims to provide a battery cell, a battery, an electrical device, and a method and equipment for manufacturing the battery cell, so that the battery has a more compact structure and higher safety.

[0004] The embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising: an electrode assembly, comprising a first electrode tab and a second electrode tab with opposite polarities, the first electrode tab and the second electrode tab being respectively located at the two ends of the electrode assembly along its own axial direction, and the electrode assembly having a winding center hole; a shell assembly, comprising a first electrode lead-in portion and a second electrode lead-in portion for inputting or outputting electrical energy, the electrode assembly being provided inside the shell assembly, the first electrode lead-in portion and the second electrode lead-in portion being both provided on one side of the shell assembly close to the first electrode tab along the axial direction, the first electrode lead-in portion being electrically connected to the first electrode tab; an adapter being passed through the winding center hole, the adapter being used to connect the second electrode tab and the second electrode lead-in portion to achieve electrical connection between the second electrode tab and the second electrode lead-in portion; a first insulating member being provided at one end of the electrode assembly where the first electrode tab is provided and being provided with a through hole for the adapter to pass through, for insulating and isolating the first electrode tab and the second electrode lead-in portion; a second insulating member being sleeved on the adapter and being located between the outer circumferential surface of the adapter and the inner wall of the winding center hole; wherein one end of the second insulating member abuts against the first insulating member.

[0006] In the technical solution of the present application, by arranging the first electrode lead-out portion and the second electrode lead-out portion at the same end of the battery cell, the busbar component can be connected at the same end of the battery cell, thereby simplifying the structure of the battery; by configuring the end of the second insulating member facing the second electrode lead-out portion to extend to abut against the first insulating member, the second electrode lead-out portion and the adapter are completely isolated from the parts of the battery cell with opposite polarity, effectively preventing the adapter from overlapping and short-circuiting when passing through the second pole ear, thereby simplifying the structure of the battery and taking into account the safety of the battery cell.

[0007] In one embodiment of the present application, a protrusion is provided on a side of the first insulating member facing away from the second electrode lead-out portion, and the protrusion is arranged along the circumference of the through hole. The second insulating member has a first end face facing the second electrode lead-out portion, and the protrusion abuts against the first end face along the axial direction.

[0008] In the above technical solution, the thickness of the first insulating part at the protrusion is greater than the thickness of the rest of the part. By making the protrusion correspond to the first end surface, the first insulating part and the second insulating part are ensured to be tightly pressed against each other, and a gap is unlikely to appear between the protrusion and the first end surface, thereby effectively preventing short circuits.

[0009] In one embodiment of the present application, along the axial direction toward the second insulating member, the inner circumferential surface of the protrusion is inclined toward the outer circumferential surface away from the adapter to form an inclined surface or an arc surface.

[0010] In the above technical solution, by configuring the inner circumference of the protrusion as an inclined surface or an arc surface, the inner circumference of the protrusion plays the role of guiding the adapter, making it easier for the adapter to pass through the first insulating member and connect to the second electrode lead-out portion.

[0011] In one embodiment of the present application, the cross-section of the protrusion in the axial direction is triangular or semicircular.

[0012] In the above technical solution, by configuring the protrusion with a triangular or semicircular cross-section in the axial direction, the inner circumference of the protrusion is formed into an inclined or curved surface, which allows the inner circumference of the protrusion to guide the adapter and facilitate assembly. Furthermore, the end of the triangular or semicircular protrusion is smaller in size, making it easier for the protrusion to be compressed and deformed when it abuts the first end surface. This further ensures that the protrusion and the first end surface are tightly abutted, making it less likely to form a gap between the protrusion and the first end surface, effectively preventing short circuits.

[0013] In one embodiment of the present application, a groove is formed on the first end surface, and the protrusion is configured to be inserted into the groove and to have an interference fit with the groove.

[0014] In the above technical solution, by interference fitting the protrusion with the groove of the first end face, the protrusion and the second insulating member partially overlap and are not easily separated, ensuring that there is no gap between the first insulating member and the second insulating member, effectively preventing short circuit.

[0015] In one embodiment of the present application, one end of the second insulating member facing the second electrode lead-out portion is located inside the winding center hole.

[0016] In the above technical solution, the second insulating member is arranged inside the winding center hole to prevent the second insulating member from extending axially out of the electrode assembly and exceeding the first tab, thereby preventing the second insulating member from interfering with the tab flattening equipment and affecting the flattening of the first tab.

[0017] In one embodiment of the present application, the second electrode lead-out portion has a second end surface facing the interior of the battery cell, and an axial projection of the protrusion on the second electrode lead-out portion is located within the range of the second end surface.

[0018] In the above technical solution, the second end face of the second electrode lead-out portion rests against the back side of the protrusion, providing a reaction force to the protrusion to ensure that the protrusion and the second insulating member are tightly pressed against each other, so that a gap is less likely to appear between the protrusion and the first end face, and the overall bending and deformation of the first insulating member is avoided, thereby effectively preventing a short circuit.

[0019] In one embodiment of the present application, there is a gap between the inner wall of the through hole and the outer peripheral surface of the adapter.

[0020] In the above technical solution, the adapter and the first insulating member are clearance-fitted, and interference is not easy when the adapter passes through, which facilitates assembly.

[0021] In one embodiment of the present application, one end of the second insulating member facing the second electrode lead-out portion extends into the through hole and has an interference fit with the through hole.

[0022] In the above technical solution, by extending one end of the second insulating member facing the second electrode lead-out portion into the through hole and having an interference fit with the through hole, the first insulating member and the second insulating member partially overlap and are not easily separated, ensuring that no gap will appear between the first insulating member and the second insulating member, effectively preventing short circuit.

[0023] In a second aspect, an embodiment of the present application provides a battery, which includes the aforementioned battery cell.

[0024] In a third aspect, an embodiment of the present application provides an electrical device, which includes the aforementioned battery.

[0025] In a fourth aspect, an embodiment of the present application provides a method for manufacturing a battery cell, comprising:

[0026] An electrode assembly is provided, the electrode assembly includes a first electrode ear and a second electrode ear with opposite polarities, the first electrode ear and the second electrode ear are respectively located at two ends of the electrode assembly along its own axis, and the electrode assembly has a winding center hole; a shell assembly is provided, the shell assembly includes a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electric energy, the first electrode lead-out portion and the second electrode lead-out portion are both arranged on the same side of the shell assembly; a transition piece is provided; a first insulating piece is provided; a second insulating piece is provided; the second insulating piece and the transition piece are passed through the winding center hole, and the second insulating piece is located at the transition piece. between the outer circumferential surface of the connector and the inner wall of the winding center hole; place the adapter, the electrode assembly, the first insulating member and the second insulating member into the shell assembly so that the side of the shell assembly with the first electrode lead-in portion and the second electrode lead-in portion is close to the first electrode tab, the first electrode lead-in portion is electrically connected to the first electrode tab, and the second electrode tab is electrically connected to the second electrode lead-in portion through the adapter, and the first insulating member is located at one end of the electrode assembly with the first electrode tab and is sleeved on the adapter to insulate and isolate the first electrode tab and the second electrode lead-in portion, and one end of the second insulating member is in contact with the first insulating member.

[0027] In a fifth aspect, an embodiment of the present application provides a battery cell manufacturing device, comprising:

[0028] The first providing device is used to provide an electrode assembly, the electrode assembly includes a first electrode ear and a second electrode ear with opposite polarities, the first electrode ear and the second electrode ear are respectively located at the two ends of the electrode assembly along its own axis, and the electrode assembly has a winding center hole; the second providing device is used to provide a shell assembly, the shell assembly includes a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electric energy, the first electrode lead-out portion and the second electrode lead-out portion are both arranged on the same side of the shell assembly; the third providing device is used to provide an adapter; the fourth providing device is used to provide a first insulating member; the fifth providing device is used to provide a second insulating member; the first assembling device is used to assemble the second insulating member , the adapter is passed through the winding center hole, and the second insulating member is located between the outer circumference of the adapter and the inner wall of the winding center hole; the second assembling device is used to place the adapter, the electrode assembly, the first insulating member and the second insulating member into the shell assembly, so that the side of the shell assembly where the first electrode lead-in portion and the second electrode lead-in portion are provided is close to the first electrode ear, the first electrode lead-in portion is electrically connected to the first electrode ear, and the second electrode ear is electrically connected to the second electrode lead-in portion through the adapter, and the first insulating member is located at one end of the electrode assembly where the first electrode ear is provided and is sleeved on the adapter to insulate and isolate the first electrode ear and the second electrode lead-in portion, and one end of the second insulating member is in contact with the first insulating member. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 A schematic diagram of a vehicle provided in accordance with an embodiment of the present application;

[0031] Figure 2 An exploded view of a battery provided in one embodiment of the present application;

[0032] Figure 3 An exploded view of a battery cell provided in one embodiment of the present application;

[0033] Figure 4 A front view of a battery cell provided in one embodiment of the present application;

[0034] Figure 5 for Figure 4 sectional view of

[0035] Figure 6 for Figure 5 A partial enlarged view of

[0036] Figure 7 A schematic diagram of a first insulating member and a second insulating member provided in an embodiment of the present application;

[0037] Figure 8 A schematic diagram of a first insulating member and a second insulating member provided in an embodiment of the present application;

[0038] Figure 9 A schematic diagram of a first insulating member and a second insulating member provided in an embodiment of the present application;

[0039] Figure 10 A schematic diagram of a first insulating member and a second insulating member provided in an embodiment of the present application;

[0040] Figure 11 A schematic diagram of a first insulating member and a second insulating member provided in an embodiment of the present application;

[0041] Figure 12 A schematic flow chart of a method for manufacturing a battery cell according to an embodiment of the present application;

[0042] Figure 13 A schematic block diagram of a battery cell manufacturing device provided in one embodiment of the present application.

[0043] Icons: 1000-Vehicle; 100-Battery; 200-Motor; 300-Controller; 101-Case; 1011-First Case; 1012-Second Case; 102-Battery Cell; 1-Electrode Assembly; 11-First Tab; 12-Second Tab; 13-Wound Center Hole; 2-Casing Assembly; 21-First Electrode Lead; 22-Second Electrode Lead; 221-Second End Face; 23-Bottom Wall; 24-Side Wall; 25-End Cap; 3-Adapter; 31-Adapter ;311-outer peripheral surface; 32-collecting part; 4-first insulating part; 41-through hole; 42-protrusion; 421-inner peripheral surface; 43-surrounding wall; 5-second insulating part; 51-first end face; 52-groove; 53-protrusion; 6-current collecting part; 7-manufacturing equipment; 71-first providing device; 72-second providing device; 73-third providing device; 74-fourth providing device; 75-fifth providing device; 76-first assembling device; 77-second assembling device; P-axial; R-radial. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The term "and / or" in this application simply describes an association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0049] 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.

[0050] The term "plurality" used in this application refers to two or more (including two).

[0051] In the present application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells or magnesium-ion battery cells, etc., and the embodiments of the present application are not limited to this.

[0052] 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. A battery generally includes a housing that encloses one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0053] A battery cell includes 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 includes a positive current collector and a positive active material layer, with the positive active material layer coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive electrode tab protruding from the positive current collector portion. The positive current collector portion is coated with the positive active material layer, while at least a portion of the positive electrode tab is not coated with the positive active material layer. For example, in lithium-ion batteries, the positive current collector can be made of aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, among others. The negative electrode sheet includes a negative current collector and a negative active material layer, with the negative active material layer coated on the surface of the current collector. The negative current collector includes a negative current collecting portion and a negative electrode tab protruding from the negative current collecting portion. The negative current collecting portion is coated with the negative active material layer, while at least a portion of the negative electrode tab is uncoated with the negative active material layer. The negative current collector can be made of copper, and the negative active material layer includes a negative active material, such as carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0054] The battery cell further includes a housing assembly for accommodating the electrode assembly and an electrode lead-out portion for electrically connecting to the electrode assembly to enable charging and discharging of the electrode assembly.

[0055] In a battery, multiple battery cells are electrically connected via a current busbar. To simplify the battery structure, the inventors placed the positive and negative electrode leads of each battery cell at the same end, facilitating connection of the current busbar to the positive and negative electrode leads. However, the inventors discovered that placing two electrode leads at the same end of a battery cell complicated the current flow path within the cell, making it prone to short circuits between components with opposite polarities, resulting in reduced safety.

[0056] In view of this, in order to simplify the structure of the battery and improve safety, an embodiment of the present application provides a solution, wherein the electrode assembly has a winding center hole, and the electrode assembly is configured to respectively provide a first pole ear and a second pole ear with opposite polarities at both ends along its own axial direction P, and the shell assembly includes a first electrode lead-in portion and a second electrode lead-in portion both provided on a side close to the first pole ear, wherein the first pole ear is electrically connected to the first electrode lead-in portion, and the second pole ear is electrically connected to the second electrode lead-in portion through an adapter provided in the winding center hole, so that the current collecting component can be connected at the same end of the battery cell, thereby simplifying the circuit. The structure of the battery, at the same time, a first insulating member is provided at one end of the electrode assembly with the first pole ear, the first insulating member isolates the first pole ear and the second electrode lead-out portion, and the first insulating member is provided with a through hole for the adapter to pass through, and a second insulating member is provided between the outer circumference of the adapter and the inner wall of the winding center hole, that is, the second insulating member is sleeved on the adapter, and one end of the second insulating member abuts against the first insulating member, so as to completely isolate the second electrode lead-out portion and the adapter from the parts of the battery cell with opposite polarity, effectively prevent overlap short circuit, and simplify the structure of the battery cell while taking into account the safety of the battery cell.

[0057] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0058] 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.

[0059] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0060] like Figure 1 As shown, Figure 1A vehicle 1000 according to one embodiment of the present application is shown. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100, a controller 300, and a motor 200 may be provided inside the vehicle 1000. The controller 300 is used to control the battery 100 to power the motor 200. For example, the battery 100 may be provided at the bottom, front, or rear 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 and for the circuit system of the vehicle 1000, for example, for the starting, navigation, and operating power requirements of the vehicle 1000. In another embodiment of the present application, the battery 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0061] In order to meet different power requirements, such as Figure 2 As shown, the battery 100 may include multiple battery cells 102, wherein the multiple battery cells 102 may be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. The battery 100 may also be referred to as a battery 100 pack. Optionally, the multiple battery cells 102 may first be connected in series, in parallel, or in a hybrid connection to form a battery 100 module, and the multiple battery 100 modules may then be connected in series, in parallel, or in a hybrid connection to form the battery 100. In other words, the multiple battery cells 102 may directly form the battery 100, or they may first form battery modules, which may then form the battery 100.

[0062] The battery 100 may further include a housing 101 (or housing), wherein the housing 101 forms a receiving space, and a plurality of battery cells 102 are received in the housing 101. The housing 101 may include two receiving parts (see Figure 2), here referred to as the first box body part 1011 and the second box body part 1012, respectively, the first box body part 1011 and the second box body part 1012 are buckled together. The shape of the first box body part 1011 and the second box body part 1012 can be determined according to the shape of the combination of multiple battery cells 102, and the first box body part 1011 and the second box body part 1012 can both have an opening. For example, the first box body part 1011 and the second box body part 1012 can both be hollow rectangular parallelepipeds and each has only one open face. The opening of the first box body part 1011 and the opening of the second box body part 1012 are arranged opposite to each other, and the first box body part 1011 and the second box body part 1012 are buckled together to form a box body 101 with a closed chamber. Of the first box body part 1011 and the second box body part 1012, one can also be a rectangular parallelepiped with an opening, and the other can be a cover structure to close the opening of the rectangular parallelepiped. The plurality of battery cells 102 are connected in parallel, in series or in a mixed combination and are placed in the box body 101 formed by buckling the first box body portion 1011 and the second box body portion 1012 .

[0063] Optionally, the battery 100 may also include other structures. For example, the battery 100 may also include a busbar component (not shown in the figure), which is used to realize electrical connection between multiple battery cells 102, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can realize electrical connection between the battery cells 102 by connecting the electrode terminals of the battery cells 102. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 102 by welding. The electrical energy of the multiple battery cells 102 can be further led out through the box 101 through a conductive mechanism. Optionally, the conductive mechanism may also belong to the busbar component.

[0064] The following describes in detail any battery cell 102. Figure 3 、 Figure 4 and Figure 5As shown, the battery cell 102 includes an electrode assembly 1, a housing assembly 2, an adapter 3, a first insulating member 4, and a second insulating member 5. The electrode assembly 1 includes a first electrode tab 11 and a second electrode tab 12 of opposite polarity. The first electrode tab 11 and the second electrode tab 12 are respectively located at the two ends of the electrode assembly 1 along its own axial direction P. The electrode assembly 1 has a winding center hole 13. The housing assembly 2 includes a first electrode lead 21 and a second electrode lead 22 for inputting or outputting electrical energy. The electrode assembly 1 is disposed inside the housing assembly 2. The first electrode lead 21 and the second electrode lead 22 are both located on one side of the housing assembly 2 along the axial direction P close to the first electrode tab 11. The first electrode lead 21 is electrically connected to the first electrode tab 11. The adapter 3 is disposed through the winding center hole 13 and is used to connect the second electrode tab 12 to the second electrode lead 22 to achieve electrical connection between the second electrode tab 12 and the second electrode lead 22. The first insulating member 4 is disposed at one end of the electrode assembly 1 where the first electrode tab 11 is located and is provided with a through hole 41 through which the adapter 3 passes. The first insulating member 4 is used to insulate and isolate the first electrode tab 11 from the second electrode lead portion 22. The second insulating member 5 is sleeved on the adapter 3 and is located between the outer circumferential surface 311 of the adapter 3 and the inner wall of the winding center hole 13. One end of the second insulating member 5 abuts against the first insulating member 4.

[0065] The electrode assembly 1 includes a first electrode plate, a second electrode plate and a separator, and the separator is used to separate the first electrode plate and the second electrode plate. The polarities of the first electrode plate and the second electrode plate are opposite. In other words, one of the first electrode plate and the second electrode plate is a positive electrode plate, and the other of the first electrode plate and the second electrode plate is a negative electrode plate. The first electrode plate, the second electrode plate and the separator are prior art. Although not shown in the drawings of the present application specification, those skilled in the art should understand their specific structures. The first pole tab 11 is the portion of the first pole plate that is not coated with the active material layer, and the second pole tab 12 is the portion of the second pole plate that is not coated with the active material layer. In other words, one of the first pole tab 11 and the second pole tab 12 is a positive pole tab, and the other of the first pole tab 11 and the second pole tab 12 is a negative pole tab. As Figure 5 As shown, the first electrode tab 11 and the second electrode tab 12 are respectively located at both ends of the axial direction P of the electrode assembly 1. In this application, the electrode assembly 1 is a wound structure with a winding center hole 13. The extension direction of the winding center hole 13 is the axial direction P, and the direction perpendicular to the axial direction P is the radial direction R.

[0066] The interior of the housing assembly 2 forms a space for accommodating the electrode assembly 1. The shape of the housing assembly 2 can be determined based on the specific shape of the electrode assembly 1. For example, if the electrode assembly 1 has a cylindrical structure, the housing assembly 2 can be cylindrical; if the electrode assembly 1 has a rectangular parallelepiped structure, the housing assembly 2 can be rectangular parallelepiped. Alternatively, both the electrode assembly 1 and the housing assembly 2 can be cylindrical.

[0067] The housing assembly 2 includes a bottom wall 23, side walls 24, and an end cap 25. The side wall 24 surrounds the bottom wall 23, one end of the side wall 24 is connected to the bottom wall 23, and the other end of the side wall 24 forms an opening opposite the bottom wall 23. The end cap 25 covers the opening. The bottom wall 23 and the side wall 24 can be integrally formed into a shell with an opening, or they can be separate components that are then connected after forming to form a shell with an opening. The end cap 25 and the shell can be separate components that are then closed and connected after forming, or they can be integrated. Specifically, the end cap 25 and the shell can form a common connection surface before other components are inserted into the shell. When the interior of the shell needs to be encapsulated, the end cap 25 is then closed onto the shell. The shell and the end cap 25 can be connected by welding, roller sealing, etc. In this embodiment, the roller sealing connection method is selected. The bottom wall 23, side walls 24, and end cap 25 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present embodiment does not impose any particular limitation on this. For example, in the present embodiment, the bottom wall 23, side walls 24, and end cap 25 are made of stainless steel.

[0068] The first electrode lead-out portion 21 and the second electrode lead-out portion 22 are simultaneously provided on the bottom wall 23 or the end cover 25 so as to be located on one side of the axial direction P of the battery cell 102. Exemplarily, the first electrode lead-out portion 21 and the second electrode lead-out portion 22 are provided on the end cover 25, the edge of the end cover 25 is connected to the side wall 24 of the housing, and the electrode terminal is insulated and mounted in the center of the end cover 25. The portion between the edge and the center of the end cover 25 serves as the first electrode lead-out portion 21, and the electrode terminal serves as the second electrode lead-out portion 22.

[0069] The first electrode lead portion 21 and the first tab 11 can be electrically connected in a direct or indirect manner to achieve electrical conduction. The direct connection between the electrode lead portion and the first tab 11 includes: direct contact conduction, bonding through conductive adhesive, or welding. The indirect connection between the first electrode lead portion 21 and the first tab 11 refers to connection through other conductive components, for example, Figure 3 As shown, the battery cell 102 also includes a current collector 6, which is a disc-shaped structure. The current collector 6 covers the first electrode tab 11 of the electrode assembly 1. The connection between the first electrode tab 11 and the current collector 6 can be conductive contact, bonding with conductive adhesive, or welding. The connection between the current collector 6 and the first electrode lead 21 can be conductive contact, bonding with conductive adhesive, or welding. In this embodiment, the current collector 6 is welded to the first electrode tab 11 and to the first electrode lead 21. A clearance hole is provided in the disc-shaped current collector 6, extending along the axial direction P. The clearance hole is opposite the winding center hole 13 of the electrode assembly 1 to allow the adapter 3 to pass through.

[0070] The adapter 3 is a component used for conducting overcurrent. Figure 3As shown, the adapter 3 includes a adapter portion 31 and a current collecting portion 32. The adapter portion 31 passes through the winding center hole 13 along the axial direction P, and the current collecting portion 32 connects the second electrode tab 12 and one end of the adapter portion 31. Optionally, the adapter portion 31 is a metal cylinder, and the current collecting portion 32 is a metal disk. The current collecting portion 32 covers the second electrode tab 12 of the electrode assembly 1. One end of the adapter portion 31 is connected to the current collecting portion 32, and the other end is connected to the second electrode lead 22. The connection between the adapter 3 and the second electrode tab 12 can be contact conductive, bonding with conductive adhesive, or welding. The connection between the adapter 3 and the second electrode lead 22 can be contact conductive, bonding with conductive adhesive, or welding.

[0071] The first insulating member 4 is an insulating component with a disc-shaped structure. The first insulating member 4 is located at one end of the electrode assembly 1 where the first electrode tab 11 is provided, to isolate the first electrode tab 11 from the second electrode lead-out portion 22. The first insulating member 4 is provided with a through hole 41 extending along the axial direction P so that the adapter 3 can pass through the through hole 41 to connect to the second electrode lead-out portion 22. When the battery cell 102 includes a current collector 6 for connecting the first electrode tab 11 and the first electrode lead-out portion 21, the first electrode tab 11 is located between the current collector 6 and the second electrode lead-out portion 22, and the adapter 3 passes through the avoidance hole of the current collector 6 and the through hole 41 of the first insulating member 4 in sequence and then connects to the second electrode lead-out portion 22.

[0072] The second insulating member 5 is an insulating component with a cylindrical structure. The second insulating member 5 is sleeved on the adapter 3, which means that the second insulating member 5 is sleeved on the adapter portion 31 of the adapter 3. The outer peripheral surface 311 of the adapter 3 mentioned in this application refers to the outer peripheral surface 311 of the adapter portion 31 of the adapter 3.

[0073] The side of the second electrode lead-out portion 22 facing the interior of the battery cell 102 is shielded by the first insulating member 4, but the second electrode lead-out portion 22 is partially exposed at the through-hole 41 of the first insulating member 4. The portion of the outer circumference 311 of the adapter 3 located within the winding center hole 13 is covered by the second insulating member 5, while the portion of the outer circumference 311 of the adapter 3 located outside the winding center hole 13 is exposed. This exposed area is prone to overlapping with a deformed first electrode tab 11, causing a short circuit. If a current collector 6 is present, this is also prone to overlapping with the current collector 6, causing a short circuit, thereby reducing the safety of the battery cell 102.

[0074] By configuring one end of the second insulating member facing the second electrode lead-out portion 22 to extend to abut against the first insulating member 4, the second electrode lead-out portion 22 and the adapter 3 are completely isolated from the parts of the battery cell 102 with opposite polarity, effectively preventing overlapping short circuits, simplifying the structure of the battery cell 102 and taking into account the safety of the battery cell 102.

[0075] In this embodiment, the term "abutment" refers to contact and tight contact, i.e., interference fit. By abutting one end of the second insulating member 5 against the first insulating member 4, even with certain manufacturing or assembly tolerances, the contact between the one end of the second insulating member 5 and the first insulating member 4 is ensured, thereby preventing a gap from forming between the one end of the second insulating member 5 and the first insulating member 4.

[0076] The material of the first insulating member 4 and the second insulating member 5 can be selected to be tough plastic, so that the abutting part between one end of the first insulating member 4 and the second insulating member 5 is elastically pressed against each other, so as to further ensure that no gap will appear between one end of the first insulating member 4 and the second insulating member 5 due to manufacturing tolerance, assembly tolerance, fatigue, etc.

[0077] According to some embodiments of the present application, Figure 6 As shown, a protrusion 42 is provided on a side of the first insulating member 4 facing away from the second electrode lead-out portion 22 , and the protrusion 42 is arranged along the circumference of the through hole 41 . The second insulating member 5 has a first end surface 51 facing the second electrode lead-out portion 22 , and the protrusion 42 abuts against the first end surface 51 along the axial direction P.

[0078] Since the adapter 3 passes through the through hole 41 , the protrusion 42 is arranged along the circumference of the through hole 41 , that is, the protrusion 42 surrounds the adapter 3 .

[0079] The first insulating member 4 is a cylindrical structure, and the first end surface 51 is an annular end surface.

[0080] The thickness of the first insulating member 4 at the protrusion 42 is greater than the thickness of the rest of the part. By aligning the protrusion 42 with the first end face 51, the first insulating member 4 and the second insulating member 5 are ensured to be tightly pressed together, and a gap is unlikely to appear between the protrusion 42 and the first end face 51, thereby effectively preventing a short circuit.

[0081] According to some embodiments of the present application, Figure 6 and Figure 7 As shown, along the axial direction P toward the second insulating member 5 , the inner circumferential surface 421 of the protrusion 42 is inclined away from the outer circumferential surface 311 of the adapter 3 to form an inclined surface or an arc surface.

[0082] The protrusion 42 surrounds the adapter 3 to form a channel. The inner circumferential surface 421 of the protrusion 42 is the side of the protrusion 42 close to the adapter 3. The inner circumferential surface 421 of the protrusion 42 is an inclined surface or an arc surface, so that the diameter of the channel surrounded by the protrusion 42 increases as it is closer to the second insulating member 5.

[0083] By configuring the inner circumferential surface 421 of the protrusion 42 as an inclined surface or an arc surface, the inner circumferential surface 421 of the protrusion 42 plays a role in guiding the adapter 3 , making it easier for the adapter 3 to pass through the first insulating member 4 and connect to the second electrode lead portion 22 .

[0084] According to some embodiments of the present application, Figure 7 and Figure 8 As shown, the cross section of the protrusion 42 in the axial direction P is triangular or semicircular.

[0085] Figure 7 and Figure 8 A cross-sectional view of the first insulating member 4 along the axial direction P and passing through the axis of the through hole 41 is shown. It can be seen that the cross-sectional shapes of the protrusion 42 on both sides of the through hole 41 are both triangular or circular.

[0086] By configuring the cross section of the protrusion 42 in the axial direction to be triangular or semicircular, the inner circumferential surface 421 of the protrusion 42 is an inclined surface or an arc surface, so that the inner circumferential surface 421 of the protrusion 42 can guide the adapter 3 and facilitate assembly.

[0087] On the other hand, by configuring the cross-section of the protrusion 42 in the axial direction P to be triangular or semicircular, the cross-sectional width of the end face of the protrusion 42 is smaller, and the protrusion 42 is easily compressed and deformed when it abuts against the first end face 51, further ensuring that the protrusion 42 and the first end face 51 are tightly abutted, so that it is not easy for a gap to appear between the protrusion 42 and the first end face 51, thereby effectively preventing short circuits.

[0088] In other embodiments, Figure 9 As shown, the cross-section of the protrusion 42 in the axial direction P is rectangular, so that the end face of the protrusion 42 is parallel to the first end face 51 to have a larger contact area, so that the protrusion 42 and the second insulating member 5 are not easily misaligned when vibrated, and the protrusion 42 and the first end face 51 are not easily misaligned to form a gap, thereby effectively preventing short circuits.

[0089] According to some embodiments of the present application, Figure 10 As shown, a groove 52 is formed on the first end surface 51 , and the protrusion 42 is configured to be inserted into the groove 52 and to have an interference fit with the groove 52 .

[0090] By interference fitting the protrusion 42 with the groove 52 of the first end face 51, the protrusion 42 partially overlaps with the second insulating member 5 and is not easily separated, ensuring that there is no gap between the first insulating member 4 and the second insulating member 5, effectively preventing short circuit.

[0091] According to some embodiments of the present application, Figure 6 As shown, one end of the second insulating member 5 facing the second electrode lead-out portion 22 is located inside the winding center hole 13 .

[0092] The tabs of the electrode assembly 1 are stacked in multiple layers or separated in multiple layers. The tabs are often kneaded by a flattening device to reduce the gap between the tabs so that the tabs have dense end faces to facilitate electrical connection with other components and ensure stable connection.

[0093] By arranging the second insulating member 5 inside the winding center hole 13 , the second insulating member 5 is prevented from extending out of the electrode assembly 1 in the axial direction P and exceeding the first electrode tab 11 , thereby preventing the second insulating member 5 from interfering with the flattening equipment and affecting the flattening of the first electrode tab 11 .

[0094] Similarly, the end of the second insulating member 5 that faces away from the second electrode lead-out portion 22 can also be configured to be located inside the winding center hole 13, so as to prevent the second insulating member 5 from extending out of the electrode assembly 1 along the axial direction P and exceeding the second pole ear 12, thereby preventing the second insulating member 5 from interfering with the flattening equipment and affecting the flattening of the second pole ear 12.

[0095] Optionally, the second insulating member 5 can be used as an auxiliary tool for winding the electrode assembly 1. The second insulating member 5 is placed on the winding needle of the winding equipment, so that the pole piece and the isolation member are wound around the second insulating member 5 to form the electrode assembly 1. After the electrode assembly 1 is formed, the electrode assembly 1 connected to the second insulating member 5 is removed from the winding needle, and operations such as kneading the pole ear are performed.

[0096] According to some embodiments of the present application, Figure 6 As shown, the second electrode lead-out portion 22 has a second end surface 221 facing the interior of the battery cell 102 , and the projection of the protrusion 42 on the second electrode lead-out portion 22 along the axial direction P is located within the range of the second end surface 221 .

[0097] The second end surface 221 is a surface of the second electrode lead-out portion 22 facing the first insulating member 4 .

[0098] In the above scheme, the second end face 221 of the second electrode lead-out portion 22 abuts against the back side of the protrusion 42, providing a reaction force to the protrusion 42 to ensure that the protrusion 42 and the second insulating member 5 are tightly abutted, so that it is not easy for a gap to appear between the protrusion 42 and the first end face 51, and it also avoids the overall bending and deformation of the first insulating member 4, effectively preventing short circuits.

[0099] According to some embodiments of the present application, Figure 6 As shown, there is a gap between the inner wall of the through hole 41 and the outer peripheral surface 311 of the adapter 3 .

[0100] The adapter and the first insulating member 4 are clearance-fitted, so the adapter 3 is not easily interfered with when passing through, which facilitates assembly.

[0101] According to some embodiments of the present application, one end of the second insulating member 5 facing the second electrode lead-out portion 22 extends into the through hole 41 and is interference-fitted with the through hole 41 .

[0102] The end of the second insulating member 5 facing the second electrode lead-out portion 22 extends into the through hole 41, which means that the end of the second insulating member 5 facing the second electrode lead-out portion 22 extends completely into the through hole 41, so that the first end surface 51 is located in the through hole 41, and the outer peripheral surface of the second insulating member 5 abuts against the inner wall of the through hole 41; or Figure 11 As shown, the second insulating member includes a body and a protrusion 53 . The protrusion 53 is formed on the first end surface 51 of the body. The protrusion 53 is inserted into the through hole 41 , and the outer peripheral surface of the protrusion 53 abuts against the inner wall of the through hole 41 .

[0103] By extending one end of the second insulating member 5 facing the second electrode lead-out portion 22 into the through hole 41 and having an interference fit with the through hole 41, the first insulating member 4 and the second insulating member 5 partially overlap and are not easily separated, ensuring that no gap will appear between the first insulating member 4 and the second insulating member 5, effectively preventing short circuits.

[0104] In some embodiments, to ensure stable installation of the first electrode lead-out portion 21, one end of the first electrode lead-out portion 21 facing the interior of the battery cell 102 protrudes from the surface of the end cover 25, and the first insulating member 4 is configured to flip the edge and form a surrounding wall 43 extending along the axial direction P toward the end cover 25. The surrounding wall 43 surrounds the side wall 24 of the end of the first electrode lead-out portion 21 facing the interior of the battery cell 102 to prevent the first electrode lead-out portion 21 from overlapping and short-circuiting with the first pole tab 11 or the current collecting member 6.

[0105] In a second aspect, an embodiment of the present application provides a battery 100, such as Figure 2 As shown, the battery 100 includes the aforementioned battery cells 102. The battery cells 102 of the battery 100 are not prone to short circuits, and the battery 100 has a high safety.

[0106] In a third aspect, the present application provides an electrical device, such as Figure 1 As shown, the electric device may be a vehicle 1000, which includes the aforementioned battery 100. The battery 100 has high safety and good power supply stability, and the vehicle 1000 has a good user experience.

[0107] In a fourth aspect, the present invention provides a method for manufacturing a battery cell 102, such as Figure 12 As shown, the manufacturing method includes:

[0108] S1. Provide an electrode assembly 1, wherein the electrode assembly 1 includes a first electrode tab 11 and a second electrode tab 12 with opposite polarities, the first electrode tab 11 and the second electrode tab 12 being located at two ends of the electrode assembly 1 along its own axial direction P, and the electrode assembly 1 has a winding center hole 13;

[0109] S2. Provide a housing assembly 2, the housing assembly 2 including a first electrode lead portion 21 and a second electrode lead portion 22 for inputting or outputting electrical energy, wherein the first electrode lead portion 21 and the second electrode lead portion 22 are both provided on the same side of the housing assembly 2;

[0110] S3, providing adapter 3;

[0111] S4, providing a first insulating member 4;

[0112] S5, providing a second insulating member 5;

[0113] S6. Pass the second insulating part 5 and the adapter 3 through the winding center hole 13, and make the second insulating part 5 located between the outer peripheral surface 311 of the adapter 3 and the inner wall of the winding center hole 13; place the adapter 3, the electrode assembly 1, the first insulating part 4 and the second insulating part 5 into the shell assembly 2, so that the side of the shell assembly 2 provided with the first electrode lead-in portion 21 and the second electrode lead-in portion 22 is close to the first electrode tab 11, the first electrode lead-in portion 21 is electrically connected to the first electrode tab 11, and the second electrode tab 12 is electrically connected to the second electrode lead-in portion 22 through the adapter 3, and make the first insulating part 4 located at one end of the electrode assembly 1 provided with the first electrode tab 11 and be sleeved on the adapter 3 to insulate and isolate the first electrode tab 11 and the second electrode lead-in portion 22, and make one end of the second insulating part 5 abut against the first insulating part 4.

[0114] It should be noted that the relevant structure of the battery cell 102 manufactured by the above-mentioned method for manufacturing the battery cell 102 can refer to the battery cell 102 provided in the above-mentioned embodiments.

[0115] When assembling the battery cell 102 according to the manufacturing method of the battery cell 102, it is not necessary to follow the above steps in sequence. In other words, the steps can be performed in the order mentioned in the embodiment, or in a different order than the embodiment, or several steps can be performed simultaneously. For example, steps S1, S2, S3, S4, and S5 can be performed in any order and can be performed simultaneously.

[0116] In a fifth aspect, the present application provides a manufacturing device 7 for a battery cell 102, such as Figure 13 As shown, it includes:

[0117] A first providing device 71 is used to provide an electrode assembly 1, wherein the electrode assembly 1 includes a first electrode tab 11 and a second electrode tab 12 with opposite polarities, the first electrode tab 11 and the second electrode tab 12 are respectively located at two ends of the electrode assembly 1 along its own axial direction P, and the electrode assembly 1 has a winding center hole 13;

[0118] A second providing device 72 is used to provide a housing assembly 2, wherein the housing assembly 2 includes a first electrode lead portion 21 and a second electrode lead portion 22 for inputting or outputting electrical energy, wherein the first electrode lead portion 21 and the second electrode lead portion 22 are both provided on the same side of the housing assembly 2;

[0119] A third providing device 73 is used to provide the adapter 3;

[0120] A fourth providing device 74 is used to provide a first insulating member 4;

[0121] A fifth providing device 75 for providing a second insulating member 5;

[0122] The first assembly device 76 is used to insert the second insulating member 5 and the adapter 3 into the winding center hole 13, and to position the second insulating member 5 between the outer peripheral surface 311 of the adapter 3 and the inner wall of the winding center hole 13;

[0123] The second assembly device 77 is used to place the adapter 3, the electrode assembly 1, the first insulating member 4 and the second insulating member 5 into the shell assembly 2, so that the side of the shell assembly 2 where the first electrode lead-out portion 21 and the second electrode lead-out portion 22 are provided is close to the first electrode tab 11, the first electrode lead-out portion 21 is electrically connected to the first electrode tab 11, and the second electrode tab 12 is electrically connected to the second electrode lead-out portion 22 through the adapter 3, and the first insulating member 4 is located at one end of the electrode assembly 1 where the first electrode tab 11 is provided and is sleeved on the adapter 3 to insulate and isolate the first electrode tab 11 and the second electrode lead-out portion 22, and one end of the second insulating member 5 is in contact with the first insulating member 4.

[0124] The relevant structure of the battery cell 102 manufactured by the above-mentioned manufacturing equipment 7 can refer to the battery cell 102 provided in the above-mentioned embodiments.

[0125] 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.

[0126] According to some embodiments of this application, please refer to Figure 3-Figure 7 As shown, a cylindrical battery cell 102 includes an electrode assembly 1 , a housing assembly 2 , a transition piece 3 , a first insulating piece 4 and a second insulating piece 5 .

[0127] The housing assembly 2 includes a cylindrical housing formed by a bottom wall 23, side walls 24, and an end cap 25. It also includes a first electrode lead 21 and a second electrode lead 22 for inputting or outputting electrical energy. The second electrode lead 22 is an electrode terminal insulated and mounted to the end cap 25. The first electrode lead 21 is the portion of the end cap 25 located between the electrode terminal and the side wall 24. The electrode assembly 1 is provided with a first electrode tab 11 and a second electrode tab 12 at either end of the axial direction P. The first and second electrode tabs 11, 12 have opposite polarities and the electrode assembly 1 has a winding center hole 13. The electrode assembly 1 is disposed within the interior space of the housing assembly 2, with the first electrode tab 11 facing the end cap 25 and the second electrode tab 12 facing the bottom wall 23. The first electrode tab 11 and the end cap 25 are electrically connected via a current collector 6. A first insulating member 4 is located between the current collector 6 and the end cap 25, covering the surface of the second electrode lead 22 located within the battery cell 102. The current collector 6 is provided with an avoidance hole for avoiding the adapter 3, and the first insulating member 4 is provided with a through hole 41. The adapter 3 is inserted into the winding center hole 13, and one end of the adapter 3 passes through the avoidance hole of the current collector 6 and the through hole 41 of the first insulating member 4 to connect to the second electrode lead-out portion 22, and the other end of the adapter 3 is connected to the second pole ear 12. The second insulating member 5 is a cylindrical structure sleeved on the adapter 3, and the second insulating member 5 is located between the outer peripheral surface 311 of the adapter 3 and the inner wall of the winding center hole 13. A protrusion 42 is formed on the side of the first insulating member 4 facing away from the second electrode lead-out portion 22, and the protrusion 42 passes through the avoidance hole of the current collector 6 and abuts against the end face of the first insulating member 4, thereby insulating and isolating the second electrode lead-out portion 22 and the adapter 3 from the components of opposite polarity in the battery cell 102.

[0128] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: An electrode assembly, comprising a first electrode tab and a second electrode tab with opposite polarities, wherein the first electrode tab and the second electrode tab are respectively located at two ends of the electrode assembly along its own axis, and the electrode assembly has a winding center hole; a housing assembly comprising a first electrode lead portion and a second electrode lead portion for inputting or outputting electrical energy, wherein the electrode assembly is disposed within the housing assembly, wherein the first electrode lead portion and the second electrode lead portion are both disposed on a side of the housing assembly close to the first tab along the axial direction, and wherein the first electrode lead portion is electrically connected to the first tab; an adapter, disposed through the winding center hole, and configured to connect the second electrode tab and the second electrode lead portion to achieve electrical connection between the second electrode tab and the second electrode lead portion; a first insulating member, disposed at one end of the electrode assembly where the first electrode tab is provided and provided with a through hole for the adapter to pass through, for insulating and isolating the first electrode tab and the second electrode lead-out portion; a second insulating member, sleeved on the adapter and located between the outer circumference of the adapter and the inner wall of the winding center hole; Wherein, one end of the second insulating member abuts against the first insulating member; A protrusion is provided on a side of the first insulating member facing away from the second electrode lead-out portion. The protrusion is arranged along the circumference of the through hole and along the axial direction toward the second insulating member. The inner circumference of the protrusion is inclined away from the outer circumference of the adapter to form an inclined surface or an arc surface.

2. The battery cell according to claim 1, wherein: The second insulating member has a first end surface facing the second electrode lead portion, and the protrusion abuts against the first end surface along the axial direction.

3. The battery cell according to claim 1, wherein: The cross section of the protrusion in the axial direction is triangular or semicircular.

4. The battery cell according to claim 2, characterized in that The first end surface is formed with a groove, and the protrusion is configured to be inserted into the groove and to be interference-fitted with the groove.

5. The battery cell according to any one of claims 2 to 4, characterized in that: One end of the second insulating member facing the second electrode lead portion is located inside the winding center hole.

6. The battery cell according to any one of claims 2 to 4, characterized in that: The second electrode lead-out portion has a second end surface facing the interior of the battery cell, and a projection of the protrusion along the axial direction on the second electrode lead-out portion is located within the range of the second end surface.

7. The battery cell according to any one of claims 1 to 4, characterized in that: There is a gap between the inner wall of the through hole and the outer peripheral surface of the adapter.

8. The battery cell according to claim 1, wherein: One end of the second insulating member facing the second electrode lead-out portion extends into the through hole and is interference-fitted with the through hole.

9. A battery, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: A battery comprising the battery of claim 9.

11. A method for manufacturing a battery cell, characterized in that: include: Providing an electrode assembly, the electrode assembly comprising a first electrode tab and a second electrode tab with opposite polarities, the first electrode tab and the second electrode tab being respectively located at two ends of the electrode assembly along its own axis, and the electrode assembly having a winding center hole; Providing a housing assembly, the housing assembly comprising a first electrode lead portion and a second electrode lead portion for inputting or outputting electrical energy, wherein the first electrode lead portion and the second electrode lead portion are both disposed on the same side of the housing assembly; Provide adapters; providing a first insulating member; providing a second insulating member; Inserting the second insulating member and the adapter into the winding center hole, and positioning the second insulating member between the outer circumference of the adapter and the inner wall of the winding center hole; The adapter, the electrode assembly, the first insulating member and the second insulating member are placed in the shell assembly so that the side of the shell assembly where the first electrode lead-out portion and the second electrode lead-out portion are close to the first electrode tab, the first electrode lead-out portion is electrically connected to the first electrode tab, and the second electrode tab is electrically connected to the second electrode lead-out portion through the adapter, and the first insulating member is located at one end of the electrode assembly where the first electrode tab is provided and is sleeved on the adapter to insulate and isolate the first electrode tab and the second electrode lead-out portion, and one end of the second insulating member is abutted against the first insulating member, a protrusion is provided on the side of the first insulating member facing away from the second electrode lead-out portion, the first insulating member is provided with a through hole for the adapter to pass through, the protrusion is arranged along the circumference of the through hole, and along the axial direction toward the second insulating member, the inner circumference of the protrusion is inclined toward the outer circumference away from the adapter to form an inclined surface or an arc surface.

12. A battery cell manufacturing device, characterized in that: include: A first providing device is used to provide an electrode assembly, wherein the electrode assembly includes a first electrode tab and a second electrode tab with opposite polarities, the first electrode tab and the second electrode tab are respectively located at two ends of the electrode assembly along its own axis, and the electrode assembly has a winding center hole; A second providing device is used to provide a housing assembly, wherein the housing assembly includes a first electrode lead portion and a second electrode lead portion for inputting or outputting electrical energy, wherein the first electrode lead portion and the second electrode lead portion are both provided on the same side of the housing assembly; A third providing device is used to provide an adapter; A fourth providing device for providing a first insulating member; a fifth providing device for providing a second insulating member; a first assembling device for inserting the second insulating member and the adapter into the winding center hole, and positioning the second insulating member between the outer circumference of the adapter and the inner wall of the winding center hole; The second assembling device is used to place the adapter, the electrode assembly, the first insulating member and the second insulating member into the shell assembly so that the side of the shell assembly provided with the first electrode lead-in portion and the second electrode lead-in portion is close to the first electrode tab, the first electrode lead-in portion is electrically connected to the first electrode tab, and the second electrode tab is electrically connected to the second electrode lead-in portion through the adapter, and the first insulating member is located at the end of the electrode assembly provided with the first electrode tab and is sleeved on the adapter to insulate and isolate the first electrode tab and the second electrode lead-in portion, and one end of the second insulating member is abutted against the first insulating member, a protrusion is provided on the side of the first insulating member facing away from the second electrode lead-in portion, the first insulating member is provided with a through hole for the adapter to pass through, the protrusion is arranged along the circumference of the through hole, and along the axial direction toward the second insulating member, the inner circumference of the protrusion is inclined toward the outer circumference away from the adapter to form an inclined surface or an arc surface.

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