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

Abstract

The present application relates to a battery cell, a battery, an electrical device, and a manufacturing method and equipment for the battery cell, and relates to the field of batteries. The present application provides a battery cell, comprising: a housing including a wall portion; an electrode terminal insulated and mounted on the wall portion; an electrode assembly disposed within the housing, the electrode assembly comprising a main body and a first tab, the first tab formed at one end of the main body proximate the wall portion; a current collecting member disposed between the electrode assembly and the wall portion, the current collecting member being used to connect the first tab and the electrode terminal; and a heat shrink film, at least a portion of which is coated on a side of the current collecting member facing the wall portion to insulate and separate the current collecting member from the wall portion. The battery cell of the present application has high safety.

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 a battery cell. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In the development of battery technology, in addition to improving battery performance, safety is also an issue that cannot be ignored. If battery safety cannot be guaranteed, the battery will be unusable. Therefore, how to enhance battery safety is a technical issue that needs to be addressed urgently in battery technology. Summary of the Invention

[0004] The purpose of this application is to provide a battery cell, a battery, an electrical device, a method for manufacturing the battery cell, and equipment. The battery cell has high safety.

[0005] In a first aspect, the present application provides a battery cell, comprising a shell, comprising a wall portion; an electrode terminal, insulated and mounted on the wall portion; an electrode assembly, arranged in the shell, the electrode assembly comprising a main body and a first pole ear, the first pole ear being formed at one end of the main body close to the wall portion; a current collecting member, arranged between the first pole ear and the wall portion, for connecting the first pole ear and the electrode terminal; a first insulating member, arranged between the current collecting member and the wall portion, for insulating and isolating the current collecting member and the wall portion; wherein a protrusion is formed on a side of the first insulating member facing the current collecting member, and along the thickness direction of the wall portion, the projection of the protrusion on the current collecting member does not overlap with the projection of the electrode terminal on the current collecting member.

[0006] The battery cell of the present application forms a protrusion on the side of the first insulating part facing the current collecting member. During the process of installing the electrode assembly into the shell, the protrusion can limit the warping of the current collecting member toward the wall, thereby limiting the deformation of the electrode assembly toward the wall, preventing misalignment between the pole pieces of the electrode assembly and causing short circuit and thermal runaway in the battery cell, thereby improving the safety of the battery cell.

[0007] In some embodiments of the present application, the current collecting member includes a central portion and a peripheral portion, the projection of the electrode terminal on the current collecting member is located in the central portion, and the projection of the protrusion on the current collecting member is located in the peripheral portion.

[0008] In the above scheme, during the process of installing the electrode assembly into the outer shell, the electrode terminal abuts against the central part, and the protrusion can abut against the peripheral part to limit and support the peripheral part, limiting the warping of the peripheral part toward the wall, thereby limiting the misalignment between the pole pieces of the outer ring of the electrode assembly, which may cause short circuit and thermal runaway in the battery cell, thereby improving the safety of the battery cell.

[0009] In some embodiments of the present application, along the radial direction of the electrode terminal, a minimum distance from the protrusion to the outer circumferential surface of the current collecting member is smaller than a minimum distance from the protrusion to the outer circumferential surface of the electrode terminal.

[0010] In the above scheme, since the probability of dislocation of the pole pieces in the outer ring of the electrode assembly is high and the amount of dislocation is large, the protrusion is set to be close to the outer peripheral surface of the current collecting component and farther away from the outer peripheral surface of the electrode terminal, so that the protrusion can limit and support the pole pieces farther away from the electrode terminal, that is, the pole pieces in the outer ring, thereby reducing the probability of dislocation of the pole pieces in the outer ring, preventing short circuit and thermal runaway in the battery cell due to dislocation of the pole pieces in the outer ring, and improving the safety of the battery cell.

[0011] In some embodiments of the present application, a gap is provided between the protrusion and the current collecting member along a thickness direction of the wall portion.

[0012] In the above scheme, since the electrode terminal needs to abut against the current collecting member to achieve electrical connection, by providing a certain gap between the protrusion and the current collecting member, the protrusion can be prevented from interfering with the connection between the electrode terminal and the current collecting member, thereby ensuring the stability of the electrical connection between the electrode terminal and the current collecting member.

[0013] In some embodiments of the present application, the protrusion is an annular protrusion arranged around the central axis of the electrode terminal; or, there are multiple protrusions, and the multiple protrusions are spaced apart and distributed around the central axis of the electrode terminal.

[0014] In the above solution, the annular protrusions provide uniform positioning and support for the outer electrode plates and diaphragm of the electrode assembly, reducing the risk of localized electrode plate misalignment. The multiple protrusions, spaced around the central axis of the electrode terminal, reduce the material required for the first insulating member and simplify its molding process.

[0015] In some embodiments of the present application, the battery cell further includes an insulating film, which covers the first electrode tab and the outer circumference of the main body and extends between the protrusion and the current collecting member.

[0016] In the above solution, the insulating film covers the outer circumference of the first tab and the main body, providing insulation and isolation between the first tab, the main body, and the outer casing. This reduces the probability of short circuits between the first tab, the main body, and the outer casing, thereby reducing the risk of short circuits in the battery cells and improving battery safety. Furthermore, the insulating film extends between the protrusion and the current collecting member, allowing the protrusion and the current collecting member to compress the insulating film, preventing the insulating film from moving and improving the stability of the insulating film covering the current collecting member, the first tab, and the main body.

[0017] In some embodiments of the present application, the shell includes a shell and an end cover, the shell includes a bottom wall and a side wall, the side wall is arranged around the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall forms an opening opposite to the bottom wall, the end cover covers the opening, and the wall portion is the bottom wall or the end cover.

[0018] In the above solution, the bottom wall and the side walls define a space for accommodating the electrode assembly, electrolyte and other structures, and the opening surrounded by the side walls is covered by the end cover to ensure the sealing of the shell.

[0019] In some embodiments of the present application, the electrode assembly further includes a second pole tab, which is formed at an end of the main body away from the wall portion, has an opposite polarity to the first pole tab, and is electrically connected to the wall portion.

[0020] In the above solution, the first pole tab and the second pole tab are located at both ends of the electrode assembly. There is good insulation between the first pole tab and the second pole tab, which reduces the risk of short circuit of the battery cell and improves the safety of the battery cell.

[0021] In a second aspect, the present application provides a battery comprising the above-mentioned battery cell.

[0022] In a third aspect, the present application provides an electrical device comprising the above-mentioned battery, wherein the battery is used to provide electrical energy.

[0023] In a fourth aspect, the present application provides a method for manufacturing a battery cell, comprising providing a shell and an electrode terminal, the shell comprising a wall portion, and the electrode terminal being insulated and mounted on the wall portion; providing an electrode assembly, the electrode assembly comprising a main body and a first pole ear, the first pole ear being formed at one end of the main body close to the wall portion; providing a current collecting member; providing a first insulating member, a protrusion being formed on a side of the first insulating member facing the current collecting member, and a projection of the protrusion on the current collecting member does not overlap with a projection of the electrode terminal on the current collecting member along the thickness direction of the wall portion; connecting the current collecting member to the first pole ear, arranging the first insulating member on the wall portion with the protrusion facing away from the wall portion, placing the electrode assembly into the shell, and connecting the current collecting member to the electrode terminal.

[0024] In a fifth aspect, the present application provides a manufacturing device for a battery cell, comprising a first providing device for providing a shell and an electrode terminal, the shell comprising a wall portion, and the electrode terminal being insulated and mounted on the wall portion; 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 being formed at one end of the main body close to the wall portion; a third providing device for providing a current collecting member; a fourth providing device for providing a first insulating member, a protrusion being formed on a side of the first insulating member facing the current collecting member, and a projection of the protrusion on the current collecting member does not overlap with a projection of the electrode terminal on the current collecting member along the thickness direction of the wall portion; an assembling device for connecting the current collecting member to the first pole ear, setting the first insulating member on the wall portion with the protrusion facing away from the wall portion, placing the electrode assembly into the shell, and connecting the current collecting member to the electrode terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0026] Figure 1 A schematic diagram of a vehicle is provided for one embodiment of the present application;

[0027] Figure 2 A schematic structural diagram of a battery provided in one embodiment of the present application;

[0028] Figure 3 An exploded view of a battery cell provided in one embodiment of the present application;

[0029] Figure 4A cross-sectional view of a battery cell provided in one embodiment of the present application;

[0030] Figure 5 A partial enlarged view of position A of a battery cell provided in one embodiment of the present application;

[0031] Figure 6 A schematic diagram of a first insulating member forming an annular protrusion according to an embodiment of the present application;

[0032] Figure 7 A schematic diagram of a first insulating member provided in an embodiment of the present application forming a plurality of protrusions;

[0033] Figure 8 A schematic diagram of an insulating film covering the outer peripheral surface of the first electrode tab and the main body according to an embodiment of the present application;

[0034] Figure 9 A partial enlarged view of point B provided in one embodiment of the present application;

[0035] Figure 10 A schematic diagram of a battery cell provided in one embodiment of the present application;

[0036] Figure 11 A schematic diagram of a method for manufacturing a battery cell according to a fourth embodiment of the present application;

[0037] Figure 12 Schematic diagram of the battery cell manufacturing equipment provided in the fifth embodiment of the present application.

[0038] In the drawings, the drawings are not drawn to scale.

[0039] Marking instructions: 10 - battery cell; 11 - housing; 11a - wall; 111 - housing; 1111 - bottom wall; 1112 - side wall; 112 - end cap; 12 - electrode terminal; 13 - electrode assembly; 131 - first electrode tab; 132 - body; 133 - second electrode tab; 14 - current collecting member; 141 - central portion; 142 - peripheral portion; 15 - first insulating member; 151 - protrusion; 16 - insulating film; 17-second insulating member; 20-housing; 21-first sub-housing; 22-second sub-housing; 100-battery; 200-controller; 300-motor; 1000-vehicle; 2000-battery cell manufacturing equipment; 2100-first providing device; 2200-second providing device; 2300-third providing device; 2400-fourth providing device; 2500-first assembling device; 2600-second assembling device; 2700-third assembling device; 2800-fourth assembling device. DETAILED DESCRIPTION

[0040] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0042] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0043] In this application, the battery referred to herein 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.

[0044] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of 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. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector 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 includes 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 uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector 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. To ensure high current flow without melting, 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).

[0045] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0046] The inventors noted that when installing the electrode assembly into the housing, a force must be applied to the electrode assembly along its axial direction to force the current collecting member (connected to one end of the electrode assembly) into contact with the electrode terminal. Because the diameters of the current collecting member and the electrode assembly are larger than those of the electrode terminal, the electrode terminal can only limit and support the current collecting member and the electrode assembly where it abuts, while the rest of the current collecting member and the electrode assembly cannot be effectively limited or supported.

[0047] For wound electrode assemblies, the electrode terminals cannot position and support the outer electrode sheets and separators (the portion where the projections of the electrode sheets and separators on the current collecting member do not overlap with the projections of the electrode terminals on the current collecting member). Therefore, when the electrode assembly is installed in the housing, the current collecting member may warp, causing the outer electrode sheets to misalign. Misaligned electrode sheets can cause short circuits within the battery cells and trigger thermal runaway, posing a significant safety hazard and seriously impacting battery safety.

[0048] Based on the above considerations, in order to reduce the probability of electrode misalignment during the installation of the electrode assembly into the shell, the inventors have designed a battery cell after in-depth research. The battery cell includes a shell, the shell includes a wall portion (located at one end of the shell), and a first insulating member is arranged between the current collecting member and the wall portion. A protrusion is formed on the side of the first insulating member facing the current collecting member, and along the thickness direction of the wall portion, the projection of the protrusion on the current collecting member does not overlap with the projection of the electrode terminal on the current collecting member.

[0049] In such a battery cell, by forming a protrusion on the side of the first insulating part facing the current collecting member, during the process of installing the electrode assembly into the shell, the protrusion can to a certain extent limit the warping of the current collecting member toward the wall, thereby limiting the deformation of the electrode assembly toward the wall, preventing misalignment between the pole pieces of the electrode assembly and causing short circuit and thermal runaway in the battery cell, thereby improving the safety of the battery cell.

[0050] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0051] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0052] like Figure 1 As shown, Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0053] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0054] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a battery cell 10, with the battery cell 10 being housed in the housing 20. The housing 20 is used to provide a storage space for the battery cell 10, and the housing 20 can adopt a variety of structures. In some embodiments, the housing 20 can include a first sub-housing 21 and a second sub-housing 22, the first sub-housing 21 and the second sub-housing 22 covering each other, and the first sub-housing 21 and the second sub-housing 22 jointly defining a storage space for accommodating the battery cell 10. The second sub-housing 22 can be a hollow structure with one end open, and the first sub-housing 21 can be a plate-shaped structure, with the first sub-housing 21 covering the open side of the second sub-housing 22, so that the first sub-housing 21 and the second sub-housing 22 jointly define a storage space; the first sub-housing 21 and the second sub-housing 22 can also be hollow structures with one side open, with the open side of the first sub-housing 21 covering the open side of the second sub-housing 22. Of course, the box body 20 formed by the first sub-box body 21 and the second sub-box body 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0055] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 10 may be housed within the housing 20. Of course, the battery 100 may also be formed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then housed within the housing 20. The battery 100 may also include other structures, for example, the battery 100 may further include a busbar component for electrically connecting the multiple battery cells 10.

[0056] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0057] like Figure 3 As shown, Figure 3 The exploded view of the battery cell 10 provided in some embodiments of the present application. The battery cell 10 refers to the smallest unit that constitutes the battery 100. Figure 3 As shown, the battery cell 10 includes a housing 11 , an electrode assembly 13 and other functional components.

[0058] The housing 11 is a component used to form the internal environment of the battery cell 10. The internal environment formed by the housing 11 can be used to accommodate the electrode assembly 13, electrolyte, and other components. The housing 11 can be of various shapes and sizes, such as cylindrical, rectangular, hexagonal, etc. Specifically, the shape of the housing 11 can be determined by the specific shape and size of the electrode assembly 13. The housing 11 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0059] The electrode assembly 13 is a component in the battery cell 10 where electrochemical reactions occur. One or more electrode assemblies 13 may be contained in the housing 11. The electrode assembly 13 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body 132 of the electrode assembly 13, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body 132 or respectively at both ends of the main body 132. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals 12 to form a current loop.

[0060] like Figure 3 As shown, the present application provides a battery cell 10 , which includes a housing 11 , an electrode terminal 12 , an electrode assembly 13 , a current collecting member 14 and a first insulating member 15 .

[0061] like Figure 4 As shown, Figure 4 This is a cross-sectional view of a battery cell according to some embodiments of the present application. The outer shell 11 includes a wall portion 11a, and the electrode terminal 12 is insulated and mounted on the wall portion 11a. The electrode assembly 13 is disposed within the outer shell 11. The electrode assembly 13 includes a main body 132 and a first electrode tab 131. The first electrode tab 131 is formed at one end of the main body 132 near the wall portion 11a. The current collecting member 14 is disposed between the electrode assembly 13 and the wall portion 11a. The current collecting member 14 is used to connect the first electrode tab 131 and the electrode terminal 12. The first insulating member 15 is disposed between the current collecting member 14 and the wall portion 11a to insulate and isolate the current collecting member 14 from the wall portion 11a. A protrusion 151 is formed on one side of the first insulating member 15 facing the current collecting member 14. Along the thickness direction of the wall portion 11a, the projection of the protrusion 151 on the current collecting member 14 does not overlap with the projection of the electrode terminal 12 on the current collecting member 14.

[0062] To reduce the risk of short circuit within the battery cell 10 , components with different polarities within the battery cell 10 should be insulated and isolated. For example, the electrode terminal 12 and the wall portion 11 a , the current collecting member 14 and the wall portion 11 a , and the first electrode tab 131 and the outer shell 11 should all be insulated and isolated.

[0063] like Figure 4 As shown, a first insulating member 15 is provided between the current collecting member 14 and the wall portion 11 a to insulate and isolate the current collecting member 14 from the wall portion 11 a.

[0064] The electrode terminal 12 is insulated and installed on the wall portion 11 a , which can be understood as follows: an insulating structure is also provided between the electrode terminal 12 and the wall portion 11 a to insulate and isolate the electrode terminal 12 and the wall portion 11 a .

[0065] For example, in some embodiments of the present application, the first insulating member 15 may extend between the electrode terminal 12 and the wall portion 11 a to insulate and isolate the electrode terminal 12 from the wall portion 11 a.

[0066] For example, Figure 4 As shown, in some other embodiments of the present application, the battery cell 10 may further include a second insulating member 17, which is arranged between the electrode terminal 12 and the wall portion 11a to insulate and isolate the electrode terminal 12 and the wall portion 11a, and the first insulating member 15 is arranged between the current collecting member 14 and the wall portion 11a to insulate and isolate the current collecting member 14 and the wall portion 11a.

[0067] In embodiments where the battery cell 10 further includes a second insulating member 17, the first insulating member 15 and the second insulating member 17 may be integrally formed. This arrangement reduces the number of components, making the battery cell 10 compact, and facilitates the installation and positioning of the first insulating member 15 and the second insulating member 17, thereby simplifying the assembly process of the battery cell 10 and improving the production efficiency of the battery cell 10. In other embodiments of the present application, the first insulating member 15 and the second insulating member 17 may also be provided separately.

[0068] The first insulating member 15 and the second insulating member 17 may be made of plastic, such as PVC (Polyvinyl Chloride), PP (Polypropylene), etc. Alternatively, the first insulating member 15 may be made of rubber, such as butyl rubber, styrene-butadiene rubber, silicone rubber, etc.

[0069] The electrode assembly 13 also includes a second electrode tab 133, which has the opposite polarity to the first electrode tab 131. The electrode assembly 13 is formed by winding electrode sheets and a separator. Specifically, the electrode sheets include a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet and the negative electrode sheet are separated by a separator. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body 132, and the parts of the positive electrode sheet and the negative electrode sheet without active materials are used to constitute the positive electrode tab and the negative electrode tab, respectively. For example, the first electrode tab 131 can be a positive electrode tab, which is composed of the part of the positive electrode sheet without active materials; the second electrode tab can be a negative electrode tab, which is composed of the part of the negative electrode sheet without active materials. Alternatively, the first electrode tab 131 can be a negative electrode tab, which is composed of the part of the negative electrode sheet without active materials; the second electrode tab can be a positive electrode tab, which is composed of the part of the positive electrode sheet without active materials.

[0070] The current collecting member 14 is used to connect the first electrode tab 131 and the electrode terminal 12 , which means that both the first electrode tab 131 and the electrode terminal 12 are connected to the current collecting member 14 , and electrical connection between the first electrode tab 131 and the electrode terminal 12 is achieved through the current collecting member 14 .

[0071] Furthermore, the projection of the protrusion 151 on the current collecting member 14 does not overlap with the projection of the electrode terminal 12 on the current collecting member 14 , which means that the protrusion 151 and the electrode terminal 12 are offset in position.

[0072] The battery cell 10 of the present application forms a protrusion 151 on the side of the first insulating part 15 facing the current collecting member 14. During the process of installing the electrode assembly 13 into the shell, the protrusion 151 can limit the warping of the current collecting member 14 toward the wall portion 11a, thereby limiting the deformation of the electrode assembly 13 toward the wall portion 11a, preventing the pole pieces of the electrode assembly 13 from being misaligned, resulting in a short circuit and thermal runaway in the battery cell 10, and improving the safety of the battery cell 10.

[0073] At the same time, the first insulating member 15 also achieves insulation isolation between the current collecting member 14 and the wall portion 11 a . The same first insulating member 15 achieves different functions, which reduces the number of components and makes the structure of the battery cell 10 compact.

[0074] like Figure 4 As shown, in some embodiments of the present application, the current collecting member 14 includes a central portion 141 and a peripheral portion 142 , the projection of the electrode terminal 12 on the current collecting member 14 is located in the central portion 141 , and the projection of the protrusion 151 on the current collecting member 14 is located in the peripheral portion 142 .

[0075] like Figure 4As shown, the peripheral portion 142 is arranged around the central portion 141. Taking the electrode assembly 13 as a wound structure as an example, the projections of the inner ring of the electrode assembly 13's pole pieces and separators on the current collecting member 14 are located on the central portion 141, while the projections of the outer ring of the electrode assembly 13's pole pieces and separators on the current collecting member 14 are located on the peripheral portion 142. When the electrode assembly 13 is installed in the housing 11, the protrusions 151 abut against the peripheral portion 142, preventing the peripheral portion 142 from warping toward the wall portion 11a. This in turn prevents the outer ring of the electrode assembly 13's pole pieces and separators from moving toward the wall portion 11a, thus avoiding pole piece misalignment and reducing the risk of short circuits and thermal runaway within the battery cell.

[0076] With this arrangement, during the process of installing the electrode assembly 13 into the housing 11, the electrode terminal 12 abuts against the central portion 141, and the protrusion 151 can abut against the peripheral portion 142 to limit and support the peripheral portion 142, thereby limiting the warping of the peripheral portion 142 toward the wall portion 11a, thereby limiting the misalignment between the pole pieces of the outer ring of the electrode assembly 13, which may cause short circuit and thermal runaway in the battery cell 10, thereby improving the safety of the battery cell 10.

[0077] like Figure 4 As shown, in some embodiments of the present application, along the radial direction of the electrode terminal 12 , the minimum distance from the protrusion 151 to the outer circumference of the current collecting member 14 is smaller than the minimum distance from the protrusion 151 to the outer circumference of the electrode terminal 12 .

[0078] It should be noted that the minimum distance between protrusion 151 and the outer circumferential surface of current collecting member 14 being less than the minimum distance between protrusion 151 and the outer circumferential surface of electrode terminal 12 means that the minimum distance between the same protrusion 151 and the outer circumferential surface of current collecting member 14 is less than the minimum distance between the same protrusion 151 and the outer circumferential surface of electrode terminal 12. After determining the position and shape of protrusion 151 formed on first insulating member 15, the minimum distance between protrusion 151 and the outer circumferential surface of current collecting member 14 is less than the minimum distance between protrusion 151 and the outer circumferential surface of electrode terminal 12.

[0079] In this arrangement, since the probability of the pole pieces of the outer ring of the electrode assembly 13 being misaligned is high and the amount of misalignment is large, the protrusion 151 is arranged to be closer to the outer peripheral surface of the current collecting component 14 and farther from the outer peripheral surface of the electrode terminal 12, so that the protrusion 151 can limit and support the pole pieces farther from the electrode terminal 12, that is, the pole pieces of the outer ring, thereby reducing the probability of the pole pieces of the outer ring being misaligned, preventing short circuit and thermal runaway in the battery cell 10 due to misalignment of the pole pieces of the outer ring, and improving the safety of the battery cell 10.

[0080] like Figure 5 As shown, Figure 5This is a partial enlarged view of some embodiments of the present application from perspective A. In some embodiments of the present application, there is a gap between the protrusion 151 and the current collecting member 14 along the thickness direction of the wall portion 11 a.

[0081] If the protrusion 151 abuts against the current collecting member 14, during the process of installing the electrode assembly 13 into the shell, the protrusion 151 will generate a force on the current collecting member 14 and the electrode assembly 13 along the axial direction of the electrode assembly 13 away from the wall portion 11a, which increases the difficulty of installing the electrode assembly 13 into the shell and reduces the production efficiency of the battery cell 10.

[0082] Furthermore, if the protrusion 151 abuts the current collecting member 14, if the dimension of the protrusion 151 along the thickness direction of the wall portion 11a is too large, the abutment between the protrusion 151 and the current collecting member 14 may cause a gap to appear between the current collecting member 14 and the electrode terminal 12, thereby affecting the stability of the electrical connection between the current collecting member 14 and the electrode terminal 12. Therefore, a certain gap may be provided between the protrusion 151 and the current collecting member 14 to eliminate the influence of the protrusion 151 caused by factors such as manufacturing errors.

[0083] In this arrangement, since the electrode terminal 12 needs to abut against the current collecting member 14 to achieve electrical connection, a certain gap is provided between the protrusion 151 and the current collecting member 14, which can avoid the protrusion 151 from interfering with the connection between the electrode terminal 12 and the current collecting member 14, thereby ensuring the stability of the electrical connection between the electrode terminal 12 and the current collecting member 14.

[0084] like Figure 6 and Figure 7 As shown, Figure 6 This is a schematic diagram of a first insulating member forming an annular protrusion in some embodiments of the present application. Figure 7 Schematic diagram of forming multiple protrusions on the first insulating member in some embodiments of the present application. In some embodiments of the present application, the protrusion 151 is an annular protrusion 151 arranged around the central axis of the electrode terminal 12, or there are multiple protrusions 151, and the multiple protrusions 151 are spaced apart around the central axis of the electrode terminal 12.

[0085] like Figure 6 As shown, in some embodiments of the present application, the protrusion 151 is an annular protrusion 151 disposed around the central axis of the electrode terminal 12. The annular protrusion 151 is not limited to a circular ring, and can also be an elliptical, square, polygonal, etc., as long as the annular protrusion 151 forms a closed ring around the central axis of the electrode terminal 12.

[0086] like Figure 7As shown, in some embodiments of the present application, there are multiple protrusions 151, and the multiple protrusions 151 are spaced apart around the central axis of the electrode terminal 12. The multiple protrusions 151 can be spaced apart around the central axis of the electrode terminal 12, and the multiple protrusions 151 can be spaced apart on the same circumference around the central axis of the electrode terminal 12, or can be spaced apart on different circumferences around the central axis of the electrode terminal 12. For example, a portion of the multiple protrusions 151 can be spaced apart on a first circumference around the central axis of the electrode terminal 12, and another portion of the multiple protrusions 151 can be spaced apart on a second circumference around the central axis of the electrode terminal 12. The diameter of the first circumference is different from the diameter of the second circumference, and the number of protrusions 151 located on the first circumference can be the same as or different from the number of protrusions 151 located on the second circumference.

[0087] When there are multiple protrusions 151 , the shape of the protrusions 151 can be cylindrical, prismatic, fan-shaped, fan-shaped, etc.

[0088] It should be noted that the present application does not impose any restrictions on the specific shape and number of the protrusions 151, as long as the setting of the protrusions 151 can provide axial force along the electrode assembly 13 to the current collecting component 14 and the electrode sheets and diaphragms of the electrode assembly 13 to prevent the electrode sheets from being misaligned.

[0089] Optionally, in some embodiments of the present application, when a plurality of protrusions 151 are provided, the protrusions 151 away from the electrode terminal 12 have a larger projected area on the current collecting member 14, while the protrusions 151 close to the electrode terminal 12 have a smaller projected area on the current collecting member 14. Since the electrode terminal 12 can provide a certain support to the electrode piece of the electrode assembly 13 close to the electrode terminal 12, but cannot provide a support to the electrode piece of the electrode assembly 13 away from the electrode terminal 12, it is necessary to provide more support to the electrode piece of the electrode assembly 13 away from the electrode terminal 12 to prevent the electrode piece of the electrode assembly 13 away from the electrode terminal 12 from being misaligned. Accordingly, the projected area of ​​the protrusions 151 away from the electrode terminal 12 on the current collecting member 14 can be set larger to provide a stable support to the electrode piece away from the electrode terminal 12.

[0090] Optionally, in some embodiments of the present application, when a plurality of protrusions 151 are provided, the protrusions 151 away from the electrode terminal 12 are denser, while the protrusions 151 close to the electrode terminal 12 are sparser. Similarly, since the electrode terminal 12 can provide a certain support for the electrode piece of the electrode assembly 13 close to the electrode terminal 12, but cannot provide a support for the electrode piece of the electrode assembly 13 away from the electrode terminal 12, it is necessary to provide more support for the electrode piece of the electrode assembly 13 away from the electrode terminal 12 to prevent the electrode piece of the electrode assembly 13 away from the electrode terminal 12 from being misaligned. Accordingly, the protrusions 151 away from the electrode terminal 12 can be provided denser to provide a stable support for the electrode piece away from the electrode terminal 12.

[0091] In this arrangement, in embodiments where the protrusion 151 is annular and disposed about the central axis of the electrode terminal 12, the annular protrusion 151 provides a relatively uniform position-limiting and support function for the electrode pieces and diaphragm of the outer ring of the electrode assembly 13, making localized electrode piece misalignment less likely to occur. In embodiments where there are multiple protrusions 151, each spaced apart about the central axis of the electrode terminal 12, the spaced-apart arrangement of the multiple protrusions 151 reduces the material required for the first insulating member 15 and reduces the difficulty in forming the first insulating member 15.

[0092] like Figure 8 and Figure 9 As shown, Figure 8 This is a schematic diagram of an insulating film covering the outer peripheral surface of the first electrode tab and the main body in some embodiments of the present application. Figure 9 In some embodiments of the present application, the battery cell 10 further includes an insulating film 16 , which covers the outer circumference of the first tab 131 and the body 132 and extends between the protrusion 151 and the current collecting member 14 .

[0093] To further reduce the risk of short circuits in the battery cell 10, the outer circumferences of the first tab 131 and the main body 132 need to be insulated from the outer shell 11. Therefore, an insulating film 16 is provided to cover the outer circumferences of the first tab 131 and the main body 132 to achieve insulation between the outer circumferences of the first tab 131 and the main body 132 and the outer shell 11.

[0094] like Figure 9As shown, in an embodiment in which a gap is provided between the protrusion 151 and the current collecting member 14 along the thickness direction of the wall portion 11a, the first insulating member 15 does not contact the current collecting member 14. Using only the first insulating member 15 to insulate the current collecting member 14 from the wall portion 11a is ineffective, and there is still a risk of a short circuit between the current collecting member 14 and the wall portion 11a. For example, a short circuit may occur between the outer peripheral surface of the current collecting member 14 and the wall portion 11a. To further improve the insulation and isolation between the current collecting member 14 and the wall portion 11a and prevent short circuits between the current collecting member 14 and the wall portion 11a, the insulating film 16 may be extended between the protrusion 151 and the current collecting member 14, allowing the insulating film 16 to cover the current collecting member 14, thereby improving the insulation and isolation between the current collecting member 14 and the wall portion 11a.

[0095] like Figure 9 As shown, when the insulating film 16 extends between the protrusion 151 and the current collecting member 14, if there is a gap between the protrusion 151 and the current collecting member 14 along the thickness direction of the wall portion 11a, the insulating film 16 can fill the gap, and the protrusion 151 can abut against the insulating film 16, that is, the protrusion 151 and the current collecting member 14 can clamp and press the insulating film 16 to prevent the insulating film 16 from being disturbed by external factors and moving, so that the insulating film 16 can stably cover the current collecting member 14, the first electrode 131 and the main body 132.

[0096] This arrangement, with the insulating film 16 covering the outer circumference of the first tab 131 and the main body 132, provides insulation between the first tab 131 and the main body 132 and the outer casing 11, reducing the probability of a short circuit between the first tab 131 and the main body 132 and the outer casing 11. This, in turn, reduces the risk of short circuits in the battery cell 10 and improves the safety of the battery cell 10. Furthermore, the insulating film 16 extends between the protrusion 151 and the current collecting member 14, allowing the protrusion 151 and the current collecting member 14 to clamp and compress the insulating film 16, preventing movement of the insulating film 16 and improving the stability of the insulating film 16 covering the current collecting member 14, the first tab 131, and the main body 132.

[0097] like Figure 10 As shown, Figure 10 Schematic diagram of a battery cell 10 according to some embodiments of the present application. In some embodiments of the present application, the housing 11 includes a shell 111 and an end cap 112. The shell 111 includes a bottom wall 1111 and side walls 1112. The side walls 1112 are disposed around the bottom wall 1111. One end of the side wall 1112 is connected to the bottom wall 1111, and the other end of the side wall 1112 forms an opening opposite the bottom wall 1111. The end cap 112 covers the opening. The wall portion 11a is either the bottom wall 1111 or the end cap 112.

[0098] The bottom wall 1111 and the side wall 1112 may be integrally formed, or they may be separately provided and connected by welding, clamping, etc. Specifically, the side wall 1112 may be columnar, such as a cylinder or a prism.

[0099] The other end of the side wall 1112 relative to the bottom wall 1111 forms an opening, and the current collecting member 14 and the electrode assembly 13 can be installed into the shell 111 from the opening. After the electrode assembly 13 is installed in the shell 111, the opening is covered by the end cover 112 to seal the opening. Furthermore, when the electrolyte needs to be added to the shell 11 and the end cover 112 covers the opening, a seal, such as a sealing ring or a sealing gasket, can be provided between the end cover 112 and the side wall 1112 to improve the sealing of the end cover 112 covering the opening and prevent the electrolyte from leaking from the shell 11.

[0100] There are two situations in which the wall portion 11a is the bottom wall 1111 or the end cap 112: one is that the wall portion 11a is the bottom wall 1111; the other is that the wall portion 11a is the end cap 112. In the embodiment where the wall portion 11a is the bottom wall 1111, after the electrode assembly 13 is installed in the housing 111, the current collecting member 14 faces the bottom wall 1111, and the heat shrink film 15 is located between the bottom wall 1111 and the current collecting member 14. In the embodiment where the wall portion 11a is the end cap 112, after the electrode assembly 13 is installed in the housing 111, the current collecting member 14 faces the end cap 112, and the heat shrink film 15 is located between the end cap 112 and the current collecting member 14.

[0101] In this arrangement, the bottom wall 1111 and the side walls 1112 define a space for accommodating the electrode assembly 13, electrolyte and other structures, and the opening surrounded by the side walls 1112 is covered by the end cover 112, thereby ensuring the sealing of the outer shell 11.

[0102] like Figure 10 As shown, in some embodiments of the present application, the electrode assembly 13 further includes a second pole ear 133, which is formed at one end of the main body 132 away from the wall portion 11a. The second pole ear 133 has an opposite polarity to the first pole ear 131, and the second pole ear 133 is electrically connected to the wall portion 11a.

[0103] like Figure 10 As shown, the first electrode tab 131 is located at one end of the electrode assembly 13 facing the wall portion 11a, and the second electrode tab 133 is located at one end of the electrode assembly 13 away from the wall portion 11a, that is, the first electrode tab 131 and the second electrode tab 133 are respectively formed at both ends of the main body 132 of the electrode assembly 13.

[0104] The first electrode tab 131 and the second electrode tab 133 have opposite polarities. For example, the first electrode tab 131 is the positive electrode tab of the electrode assembly 13, which is composed of the part of the positive electrode sheet without active material, and is electrically connected to the collecting component 14 and the electrode terminal 12. The second electrode tab 133 is the negative electrode tab of the electrode assembly 13, which is composed of the part of the negative electrode sheet without active material, and is electrically connected to the shell 11 and the wall portion 11a.

[0105] In this configuration, the first electrode tab 131 and the second electrode tab 133 are located at both ends of the electrode assembly 13 . There is good insulation between the first electrode tab 131 and the second electrode tab 133 , which reduces the risk of short circuit of the battery cell 10 and improves the safety of the battery cell 10 .

[0106] Secondly, the present application also provides a battery 100 including the aforementioned battery cell 10. In the battery cell 10, a protrusion 151 is formed on the side of the first insulating member 15 facing the current collecting member 14 to support the electrode sheets of the electrode assembly 13. This reduces the probability of electrode sheet misalignment during insertion of the electrode assembly 13 into the battery cell 10, reduces the risk of short circuits and thermal runaway within the battery cell 10, and thereby improves the safety of the battery 100.

[0107] In a third aspect, the present application further provides an electrical device, which includes the above-mentioned battery 100, and the battery 100 is used to provide electrical energy.

[0108] Fourthly, Figure 11 As shown, Figure 11 Schematic diagram of a method for manufacturing a battery cell according to some embodiments of the present application. The present application also provides a method for manufacturing a battery cell 10. Specifically, the method for manufacturing the battery cell 10 is as follows:

[0109] S100, providing a housing 11 and an electrode terminal 12, wherein the housing 11 includes a wall portion 11a, and the electrode terminal 12 is insulated and mounted on the wall portion 11a;

[0110] S200 , providing an electrode assembly 13 , the electrode assembly 13 including a main body 132 and a first electrode tab 131 , the first electrode tab 131 being formed at one end of the main body 132 close to the wall portion 11 a ;

[0111] S300 , providing a current collecting component 14 , and connecting the current collecting component 14 to the first electrode tab 131 ;

[0112] S400 , providing a first insulating member 15 , wherein a protrusion 151 is formed on a side of the first insulating member 15 facing the current collecting member 14 , and along the thickness direction of the wall portion 11 a , a projection of the protrusion 151 on the current collecting member 14 does not overlap with a projection of the electrode terminal 12 on the current collecting member 14 ;

[0113] S500 , disposing the first insulating member 15 on the wall portion 11 a , with the protrusion 151 facing away from the wall portion 11 a ;

[0114] S600 , placing the electrode assembly 13 and the current collecting member 14 into the housing 11 ;

[0115] At S700 , the current collecting member 14 is connected to the electrode terminal 12 .

[0116] It should be noted that the above-mentioned manufacturing method of the battery cell 10 is only a schematic diagram of the production process of the battery cell 10, and does not represent the specific order of the production process of the battery cell 10. During the production process of the battery cell 10, a specific process flow can be formulated according to actual conditions.

[0117] Fifthly, Figure 12 As shown, Figure 12 Schematic diagram of battery cell manufacturing equipment according to some embodiments of the present application. The present application also provides a battery cell manufacturing equipment 2000, which includes a first providing device 2100, a second providing device 2200, a third providing device 2300, a fourth providing device 2400, a first assembling device 2500, a second assembling device 2600, a third assembling device 2700, and a fourth assembling device 2800.

[0118] Specifically, the first providing device 2100 is used to provide the outer shell 11 and the electrode terminal 12. The outer shell 11 includes a wall portion 11a, and the electrode terminal 12 is insulated and mounted on the wall portion 11a. The second providing device 2200 is used to provide the electrode assembly 13. The electrode assembly 13 includes a main body 132 and a first electrode tab 131. The first electrode tab 131 is formed at one end of the main body 132 near the wall portion 11a. The third providing device 2300 is used to provide the current collecting member 14. The fourth providing device 2400 is used to provide the first insulating member 15. The side of the first insulating member 15 facing the current collecting member 14 is formed with a protrusion 151. Along the thickness direction of the wall portion 11a, the projection of the protrusion 151 on the current collecting member 14 does not overlap with the projection of the electrode terminal 12 on the current collecting member 14. The first assembling device 2500 is used to connect the current collecting member 14 to the first electrode tab 131. The second assembly device 2600 is used to place the first insulating member 15 on the wall portion 11a with the protrusion 151 facing away from the wall portion 11a. The third assembly device 2700 is used to place the electrode assembly 13 and the current collecting member 14 into the housing 11. The fourth assembly device 2800 is used to connect the current collecting member 14 to the electrode terminal 12.

[0119] In some embodiments of the present application, Figure 3-Figure 9As shown, the present application provides a battery cell 10. The battery cell 10 includes a shell 11, an electrode terminal 12, an electrode assembly 13, a current collecting member 14 and a first insulating member 15. The shell 11 includes a wall portion 11a, and the electrode terminal 12 is insulated and mounted on the wall portion 11a. The electrode assembly 13 is disposed in the shell 11, and the electrode assembly 13 includes a main body 132 and a first pole tab 131. The first pole tab 131 is formed at one end of the main body 132 close to the wall portion 11a. The current collecting member 14 is disposed between the electrode assembly 13 and the wall portion 11a, and the current collecting member 14 is used to connect the first pole tab 131 and the electrode terminal 12. The first insulating member 15 is disposed between the current collecting member 14 and the wall portion 11a, and is used to insulate and isolate the current collecting member 14 from the wall portion 11a. A protrusion 151 is formed on the side of the first insulating member 15 facing the current collecting member 14. Along the thickness of the wall portion 11a, the projection of the protrusion 151 on the current collecting member 14 does not overlap with the projection of the electrode terminal 12 on the current collecting member 14. The projection of the protrusion 151 on the current collecting member 14 is located in the peripheral portion 142, while the projection of the electrode terminal 12 on the current collecting member 14 is located in the central portion 141. Furthermore, the minimum distance between the protrusion 151 and the outer circumference of the current collecting member 14 is smaller than the minimum distance between the protrusion 151 and the outer circumference of the electrode terminal 12. A certain gap exists between the protrusion 151 and the current collecting member 14. The outer circumferences of the first tab 131 and the main body 132 of the electrode assembly 13 are covered with an insulating film 16, which extends between the protrusion 151 and the current collecting member 14.

[0120] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing, comprising a wall portion, wherein the housing is cylindrical; an electrode terminal, insulated and mounted on the wall; an electrode assembly disposed in the housing, the electrode assembly comprising a main body and a first electrode tab, wherein the first electrode tab is formed at one end of the main body close to the wall portion; a current collecting member, disposed between the first electrode tab and the wall portion, and configured to connect the first electrode tab and the electrode terminal; a first insulating member, disposed between the current collecting member and the wall portion, for insulating and isolating the current collecting member and the wall portion; wherein a protrusion is formed on a side of the first insulating member facing the current collecting member, and along the thickness direction of the wall portion, a projection of the protrusion on the current collecting member does not overlap with a projection of the electrode terminal on the current collecting member; The current collecting member includes a central portion and a peripheral portion, a projection of the electrode terminal on the current collecting member is located at the central portion, and a projection of the protrusion on the current collecting member is located at the peripheral portion.

2. The battery cell according to claim 1, wherein: In a radial direction of the electrode terminal, a minimum distance from the protrusion to an outer circumferential surface of the current collecting member is smaller than a minimum distance from the protrusion to the outer circumferential surface of the electrode terminal.

3. The battery cell according to claim 1, wherein: A gap is formed between the protrusion and the current collecting member along a thickness direction of the wall portion.

4. The battery cell according to claim 1, wherein: The protrusion is an annular protrusion arranged around the central axis of the electrode terminal; Alternatively, there are multiple protrusions, and the multiple protrusions are spaced apart and distributed around the central axis of the electrode terminal.

5. The battery cell according to claim 1, characterized in that The battery cell further includes an insulating film covering the first electrode tab and an outer circumferential surface of the body and extending between the protrusion and the current collecting member.

6. The battery cell according to claim 1, characterized in that The outer shell includes a shell and an end cover, the shell includes a bottom wall and a side wall, the side wall is arranged around the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall forms an opening opposite to the bottom wall, the end cover covers the opening, and the wall portion is the bottom wall or the end cover.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The electrode assembly further includes a second electrode tab formed at an end of the main body away from the wall portion. The second electrode tab has a polarity opposite to that of the first electrode tab and is electrically connected to the wall portion.

8. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 7.

9. An electrical device, characterized in that: The battery according to claim 8 is used to provide electrical energy.

10. A method for manufacturing a battery cell, characterized in that: include: Providing a housing and an electrode terminal, wherein the housing includes a wall portion, and the electrode terminal is insulated and mounted on the wall portion; Providing an electrode assembly, the electrode assembly comprising a main body and a first electrode tab, wherein the first electrode tab is formed at one end of the main body close to the wall portion; Providing a current collecting component, and connecting the current collecting component to the first electrode tab; providing a first insulating member, wherein a protrusion is formed on a side of the first insulating member facing the current collecting member, and along the thickness direction of the wall portion, a projection of the protrusion on the current collecting member does not overlap with a projection of the electrode terminal on the current collecting member; The current collecting member includes a central portion and a peripheral portion, the projection of the electrode terminal on the current collecting member is located on the central portion, and the projection of the protrusion on the current collecting member is located on the peripheral portion; Disposing the first insulating member on the wall portion with the protrusion facing away from the wall portion; placing the electrode assembly and the current collecting member into the housing; The current collecting member is connected to the electrode terminal.

11. A battery cell manufacturing device, characterized in that: include: A first providing device is used to provide a housing and an electrode terminal, wherein the housing is cylindrical and includes a wall portion, and the electrode terminal is insulated and mounted on the wall portion; 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 is formed at one end of the main body close to the wall portion; A third providing device is used to provide a current collecting member; A fourth providing device is configured to provide a first insulating member, wherein a protrusion is formed on a side of the first insulating member facing the current collecting member, and along the thickness direction of the wall portion, a projection of the protrusion on the current collecting member does not overlap with a projection of the electrode terminal on the current collecting member; the current collecting member includes a central portion and a peripheral portion, the projection of the electrode terminal on the current collecting member is located in the central portion, and the projection of the protrusion on the current collecting member is located in the peripheral portion; a first assembling device, for connecting the current collecting component to the first electrode tab; a second assembling device for arranging the first insulating member on the wall portion and making the protrusion face away from the wall portion; a third assembling device, configured to place the electrode assembly into the housing; A fourth assembling device is used to connect the current collecting member to the electrode terminal.

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