Battery cell, battery, electric device, method and apparatus for manufacturing battery cell

Abstract

The application relates to a battery monomer, a battery, a power utilization device, a battery monomer manufacturing method and equipment, and relates to the battery field. The application provides a battery monomer, which comprises a shell, a wall part, an electrode terminal, an electrode assembly, a current collecting member and a heat shrinkable film. The electrode terminal is insulatively installed on the wall part. The electrode assembly is arranged in the shell and comprises a main body and a first tab. The first tab is formed at one end of the main body close to the wall part. The current collecting member is arranged between the electrode assembly and the wall part and is used for connecting the first tab and the electrode terminal. At least a part of the heat shrinkable film is wrapped on one side of the current collecting member facing the wall part, so as to insulatively separate the current collecting member and the wall part. The battery monomer has high safety.

Description

[0001] This application is a divisional application of the invention patent application filed on October 20, 2021, with application number 202180093647.1 and entitled "Battery cell, battery, electrical device, method and apparatus for manufacturing battery cell". Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery cell, a battery, an electrical device, a method for manufacturing the battery cell, and equipment. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0004] In the development of battery technology, besides improving battery performance, safety is also a crucial issue that cannot be ignored. If battery safety cannot be guaranteed, then the battery is unusable. Therefore, how to enhance battery safety is a pressing technical problem that needs to be solved in battery technology. Summary of the Invention

[0005] 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. This battery cell has high safety.

[0006] In a first aspect, this application provides a battery cell, including a housing, including a wall portion; an electrode terminal, insulatedly mounted on the wall portion; an electrode assembly disposed within the housing, the electrode assembly including a body and a first tab, the first tab being formed at one end of the body near the wall portion; a current collector disposed between the first tab and the wall portion for connecting the first tab and the electrode terminal; and a first insulating member disposed between the current collector and the wall portion for insulatingly isolating the current collector and the wall portion; wherein, a protrusion is formed on the side of the first insulating member facing the current collector, and along the thickness direction of the wall portion, the projection of the protrusion on the current collector does not overlap with the projection of the electrode terminal on the current collector.

[0007] The battery cell of this application has a protrusion formed on the side of the first insulating member facing the current collector. During the process of installing the electrode assembly into the housing, the protrusion can restrict the current collector from warping toward the wall, thereby restricting the deformation of the electrode assembly toward the wall, preventing misalignment between the electrodes of the electrode assembly, which could lead to short circuits and thermal runaway within the battery cell, and improving the safety of the battery cell.

[0008] In some embodiments of this application, the current collector includes a central portion and a peripheral portion, the projection of the electrode terminal on the current collector is located in the central portion, and the projection of the protrusion on the current collector is located in the peripheral portion.

[0009] In the above scheme, during the process of installing the electrode assembly into the housing, the electrode terminals abut against the central part, and the protrusions abut against the surrounding parts to limit and support the surrounding parts, restricting the surrounding parts from warping toward the wall, thereby limiting the misalignment between the outer plates of the electrode assembly, which could lead to short circuits and thermal runaway in the battery cell, thus improving the safety of the battery cell.

[0010] In some embodiments of this application, the minimum distance from the protrusion to the outer peripheral surface of the current collector along the radial direction of the electrode terminal is less than the minimum distance from the protrusion to the outer peripheral surface of the electrode terminal.

[0011] In the above scheme, since the outer ring of the electrode assembly has a high probability of misalignment and a large amount of misalignment, the protrusion is set to be closer to the outer peripheral surface of the current collector and farther from the outer peripheral surface of the electrode terminal. This allows the protrusion to limit and support the electrode that is farther from the electrode terminal, i.e., the outer ring of the electrode, reducing the probability of misalignment of the outer ring of the electrode, preventing short circuits and thermal runaway in the battery cell due to misalignment of the outer ring of the electrode, and improving the safety of the battery cell.

[0012] In some embodiments of this application, there is a gap between the protrusion and the current collection member along the thickness direction of the wall.

[0013] In the above scheme, since the electrode terminal needs to come into contact with the current collector to achieve electrical connection, by setting a certain gap between the protrusion and the current collector, the protrusion can avoid interfering with the connection between the electrode terminal and the current collector, thus ensuring the stability of the electrical connection between the electrode terminal and the current collector.

[0014] In some embodiments of this application, the protrusion is an annular protrusion arranged around the central axis of the electrode terminal; or, the number of the protrusions is multiple, and the multiple protrusions are distributed at intervals around the central axis of the electrode terminal.

[0015] In the above scheme, the annular protrusions provide relatively uniform positioning and support for the outer ring of the electrode assembly's electrodes and diaphragms, making it less prone to electrode misalignment in localized areas. The arrangement of multiple protrusions spaced around the central axis of the electrode terminals reduces the material required for the first insulating component and lowers the difficulty of molding it.

[0016] In some embodiments of this application, the battery cell further includes an insulating film that covers the outer peripheral surface of the first tab and the body and extends between the protrusion and the current collector.

[0017] In the above scheme, by covering the outer periphery of the first tab and the main body with an insulating film, the insulating film provides insulation and isolation between the first tab and the main body and the outer shell, reducing the probability of short circuit between the first tab and the main body and the outer shell, thereby reducing the risk of short circuit in the battery cell and improving the safety of the battery cell. At the same time, the insulating film extends between the protrusion and the current collector, allowing the protrusion and the current collector to press the insulating film tightly, preventing the insulating film from shifting, and improving the stability of the insulating film covering the current collector, the first tab, and the main body.

[0018] In some embodiments of this application, the housing includes a housing and an end cap. The housing includes a bottom wall and a side wall. The side wall surrounds 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 cap covers the opening, and the wall portion is either the bottom wall or the end cap.

[0019] In the above design, the bottom wall and side walls define the space for accommodating the electrode assembly, electrolyte, and other structures, and the opening formed by the side walls is covered by an end cap, ensuring the airtightness of the housing.

[0020] In some embodiments of this application, the electrode assembly further includes a second tab formed at one end of the body away from the wall portion, the second tab having the opposite polarity to the first tab, and the second tab being electrically connected to the wall portion.

[0021] In the above scheme, the first tab and the second tab are located at both ends of the electrode assembly. The first tab and the second tab have good insulation, which reduces the risk of short circuit in the battery cell and improves the safety of the battery cell.

[0022] Secondly, this application provides a battery, including the aforementioned battery cell.

[0023] Thirdly, this application provides an electrical device including the aforementioned battery, which is used to provide electrical energy.

[0024] Fourthly, this application provides a method for manufacturing a battery cell, comprising providing a housing and electrode terminals, the housing including a wall portion, the electrode terminals being insulatedly mounted on the wall portion; providing an electrode assembly including a body and a first tab, the first tab being formed at one end of the body near the wall portion; providing a current collector; providing a first insulating member, the first insulating member having a protrusion formed on the side facing the current collector, the projection of the protrusion on the current collector not overlapping the projection of the electrode terminal on the current collector along the thickness direction of the wall portion; connecting the current collector to the first tab, disposing the first insulating member on the wall portion with the protrusion facing away from the wall portion, placing the electrode assembly into the housing, and connecting the current collector to the electrode terminals.

[0025] Fifthly, this application provides a manufacturing apparatus for a battery cell, comprising: a first providing device for providing a housing and electrode terminals, the housing including a wall portion, the electrode terminals being insulatedly mounted on the wall portion; a second providing device for providing an electrode assembly, the electrode assembly including a body and a first tab, the first tab being formed at one end of the body near the wall portion; a third providing device for providing a current collector; a fourth providing device for providing a first insulating member, the first insulating member having a protrusion formed on the side facing the current collector, the projection of the protrusion on the current collector not overlapping the projection of the electrode terminal on the current collector along the thickness direction of the wall portion; and an assembly device for connecting the current collector to the first tab, disposing the first insulating member on the wall portion with the protrusion facing away from the wall portion, placing the electrode assembly into the housing, and connecting the current collector to the electrode terminals. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0027] Figure 1 A schematic diagram of a vehicle is provided for one embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of a battery provided in one embodiment of this application;

[0029] Figure 3 An exploded view of a single battery cell provided in an embodiment of this application;

[0030] Figure 4A cross-sectional view of a battery cell provided in an embodiment of this application;

[0031] Figure 5 This is a partial enlarged view of point A in a battery cell provided in an embodiment of this application;

[0032] Figure 6 A schematic diagram showing the formation of an annular protrusion in the first insulating member according to an embodiment of this application;

[0033] Figure 7 This is a schematic diagram showing a first insulating member with multiple protrusions according to an embodiment of this application;

[0034] Figure 8 This is a schematic diagram showing the insulating film covering the outer peripheral surface of the first electrode tab and the main body according to an embodiment of this application;

[0035] Figure 9 This is a partial enlarged view of point B provided in an embodiment of this application;

[0036] Figure 10 A schematic diagram of a single battery cell provided in an embodiment of this application;

[0037] Figure 11 A schematic diagram illustrating the manufacturing method of a single battery cell provided in the four embodiments of this application;

[0038] Figure 12 This is a schematic diagram of the manufacturing equipment for a single battery cell provided in the five embodiments of this application.

[0039] The accompanying drawings are not drawn to scale.

[0040] Marking Explanation: 10-Battery cell; 11-Casing; 11a-Wall; 111-Housing; 1111-Bottom wall; 1112-Side wall; 112-End cap; 12-Electrode terminal; 13-Electrode assembly; 131-First tab; 132-Main body; 133-Second tab; 14-Current collector; 141-Central part; 142-Surrounding part; 15-First insulating element; 151-Protrusion; 16-Insulating film; 17-Second insulating element; 20-Box; 21-First sub-box; 22-Second sub-box; 100-Battery; 200-Controller; 300-Motor; 1000-Vehicle; 2000-Battery cell manufacturing equipment; 2100-First supply device; 2200-Second supply device; 2300-Third supply device; 2400-Fourth supply device; 2500-First assembly device; 2600-Second assembly device; 2700-Third assembly device; 2800-Fourth assembly device. Detailed Implementation

[0041] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation 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 orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0043] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] In this application, the term "battery" refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack.

[0045] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated negative current collector protrudes beyond the coated one, serving 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, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. The separator can be made of PP (Polypropylene) or PE (Polyethylene), etc.

[0046] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0047] The inventors noted that during the process of installing the electrode assembly into the housing, a force needs to be applied to the electrode assembly along its axial direction to bring the current collector (connected to one end of the electrode assembly) into contact with the electrode terminal. Since the diameters of the current collector and the electrode assembly are larger than the diameters of the electrode terminals, the electrode terminals can only provide restraint and support to the current collector and the electrode assembly at the point of contact, while the remaining parts of the current collector and the electrode assembly cannot be effectively restrained and supported.

[0048] For wound electrode assemblies, the electrode terminals cannot limit or support the outer ring of the electrode assembly's electrodes and separator (the portion where the projections of the electrodes and separator onto the current collector do not overlap with the projections of the electrode terminals onto the current collector). Therefore, when the electrode assembly is installed into the casing, the current collector warps, causing misalignment of the outer ring of electrodes. Electrode misalignment can cause internal short circuits in the battery cell and trigger thermal runaway, posing a significant safety hazard and seriously affecting battery safety.

[0049] Based on the above considerations, in order to reduce the probability of electrode misalignment during the installation of electrode components into the casing, the inventors, after in-depth research, designed a battery cell. The battery cell includes a casing, the casing includes a wall (located at one end of the casing), a first insulating member is provided between the current collector and the wall, and a protrusion is formed on the side of the first insulating member facing the current collector. Along the thickness direction of the wall, the projection of the protrusion on the current collector does not overlap with the projection of the electrode terminal on the current collector.

[0050] In such a battery cell, by forming a protrusion on the side of the first insulator facing the current collector, the protrusion can limit the warping of the current collector toward the wall to a certain extent during the process of installing the electrode assembly into the housing, thereby limiting the deformation of the electrode assembly toward the wall, preventing misalignment between the electrodes of the electrode assembly from causing short circuits and thermal runaway within the battery cell, and improving the safety of the battery cell.

[0051] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0052] For ease of explanation, the following embodiments use a vehicle as an example of an electrical device according to an embodiment of this application.

[0053] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0054] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0055] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 20 and a battery cell 10, with the battery cell 10 housed within the housing 20. The housing 20 provides a space for the battery cell 10, and can employ various structures. In some embodiments, the housing 20 may include a first sub-housing 21 and a second sub-housing 22, which overlap each other, jointly defining a space for accommodating the battery cell 10. The second sub-housing 22 may be a hollow structure with one open end, while the first sub-housing 21 may be a plate-like structure, 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 the space. Alternatively, both the first sub-housing 21 and the second sub-housing 22 may be hollow structures with one open side, with the open side of the first sub-housing 21 overlapping the open side of the second sub-housing 22. Of course, the box 20 formed by the first sub-box 21 and the second sub-box 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0056] In battery 100, there can be multiple battery cells 10, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, battery 100 can also be composed of multiple battery cells 10 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 20. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 10.

[0057] 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 to these. The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0058] like Figure 3 As shown, Figure 3 This is an exploded view of a battery cell 10 provided in some embodiments of this application. The battery cell 10 refers to the smallest unit that makes up the battery 100. For example... Figure 3 As shown, the battery cell 10 includes a housing 11, an electrode assembly 13, and other functional components.

[0059] The outer casing 11 is a component used to form the internal environment of the battery cell 10, wherein the internal environment formed by the outer casing 11 can accommodate the electrode assembly 13, electrolyte, and other components. The outer casing 11 can be of various shapes and sizes, such as cylindrical, cuboid, hexagonal prism, etc. Specifically, the shape of the outer casing 11 can be determined according to the specific shape and size of the electrode assembly 13. The outer casing 11 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0060] Electrode assembly 13 is the component in the battery cell 10 where electrochemical reactions occur. The casing 11 may contain one or more electrode assemblies 13. The electrode assembly 13 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the body 132 of the electrode assembly 13, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the body 132 or respectively at both ends of the body 132. During the charging and discharging process of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 12 to form a current loop.

[0061] like Figure 3 As shown, this application provides a battery cell 10, which includes a housing 11, electrode terminals 12, electrode assembly 13, current collector 14, and a first insulating member 15.

[0062] like Figure 4 As shown, Figure 4 This is a cross-sectional view of a battery cell according to some embodiments of this application. The housing 11 includes a wall 11a, to which electrode terminals 12 are insulatedly mounted. An electrode assembly 13 is disposed within the housing 11, and includes a body 132 and a first tab 131 formed at one end of the body 132 near the wall 11a. A current collector 14 is disposed between the electrode assembly 13 and the wall 11a, and is used to connect the first tab 131 and the electrode terminal 12. A first insulating member 15 is disposed between the current collector 14 and the wall 11a, for insulating and isolating the current collector 14 and the wall 11a. A protrusion 151 is formed on the side of the first insulating member 15 facing the current collector 14, and along the thickness direction of the wall 11a, the projection of the protrusion 151 onto the current collector 14 does not overlap with the projection of the electrode terminal 12 onto the current collector 14.

[0063] To reduce the risk of short circuits within the battery cell 10, components with different polarities within the battery cell 10 should be insulated from each other. For example, the electrode terminal 12 and the wall portion 11a, the current collector 14 and the wall portion 11a, and the first tab 131 and the outer casing 11 should all be insulated from each other.

[0064] like Figure 4 As shown, a first insulating member 15 is provided 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.

[0065] The fact that the electrode terminal 12 is insulated and installed on the wall portion 11a can be understood as that an insulating structure is also provided between the electrode terminal 12 and the wall portion 11a to insulate and isolate the electrode terminal 12 and the wall portion 11a.

[0066] For example, in some embodiments of this application, the first insulating member 15 may extend between the electrode terminal 12 and the wall portion 11a to insulate and isolate the electrode terminal 12 and the wall portion 11a.

[0067] For example, such as Figure 4 As shown, in some other embodiments of this application, the battery cell 10 may further include a second insulating member 17, which is disposed between the electrode terminal 12 and the wall portion 11a to insulate and isolate the electrode terminal 12 and the wall portion 11a, while a first insulating member 15 is disposed between the current collector 14 and the wall portion 11a to insulate and isolate the current collector 14 and the wall portion 11a.

[0068] In embodiments where the battery cell 10 may further include a second insulating member 17, the first insulating member 15 and the second insulating member 17 can be integrally formed. This arrangement reduces the number of parts, making the battery cell 10 more compact, and facilitates the installation and positioning of the first insulating member 15 and the second insulating member 17, simplifying the assembly process of the battery cell 10 and improving its production efficiency. In other embodiments of this application, the first insulating member 15 and the second insulating member 17 can also be separately provided.

[0069] The first insulating component 15 and the second insulating component 17 can be made of plastic, such as PVC (Polyvinyl Chloride), PP (Polypropylene), etc. Alternatively, the first insulating component 15 can also be made of rubber, such as butyl rubber, styrene-butadiene rubber, silicone rubber, etc.

[0070] The electrode assembly 13 also includes a second tab 133, which has the opposite polarity to the first tab 131. The electrode assembly 13 is formed by winding an electrode sheet and a separator. Specifically, the electrode sheet includes a positive electrode sheet and a negative electrode sheet, which are separated by a separator. The portions of the positive and negative electrode sheets containing active material constitute the main body 132, while the portions of the positive and negative electrode sheets without active material are used to form the positive and negative tabs, respectively. For example, the first tab 131 can be a positive tab, formed by the portion of the positive electrode sheet without active material; the second tab can be a negative tab, formed by the portion of the negative electrode sheet without active material. Alternatively, the first tab 131 can be a negative tab, formed by the portion of the negative electrode sheet without active material; the second tab can be a positive tab, formed by the portion of the positive electrode sheet without active material.

[0071] The current collector 14 is used to connect the first tab 131 and the electrode terminal 12, meaning that both the first tab 131 and the electrode terminal 12 are connected to the current collector 14, and the electrical connection between the first tab 131 and the electrode terminal 12 is achieved through the current collector 14.

[0072] Furthermore, the fact that the projection of the protrusion 151 on the current collector 14 does not overlap with the projection of the electrode terminal 12 on the current collector 14 means that the protrusion 151 and the electrode terminal 12 are misaligned.

[0073] The battery cell 10 of this application has a protrusion 151 formed on the side of the first insulating member 15 facing the current collector 14. During the process of installing the electrode assembly 13 into the housing, the protrusion 151 can restrict the warping of the current collector 14 toward the wall portion 11a, thereby restricting the deformation of the electrode assembly 13 toward the wall portion 11a, preventing misalignment between the electrodes of the electrode assembly 13, which would lead to short circuit and thermal runaway in the battery cell 10, and improving the safety of the battery cell 10.

[0074] Meanwhile, the first insulating member 15 also achieves insulation isolation between the current collector 14 and the wall portion 11a. The same first insulating member 15 performs different functions, reducing the number of parts and making the structure of the battery cell 10 compact.

[0075] like Figure 4 As shown, in some embodiments of this application, the current collector 14 includes a central portion 141 and a peripheral portion 142. The projection of the electrode terminal 12 on the current collector 14 is located in the central portion 141, and the projection of the protrusion 151 on the current collector 14 is located in the peripheral portion 142.

[0076] 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 projection of the inner ring electrode and separator of the electrode assembly 13 onto the current collector 14 is located in the central portion 141, while the projection of the outer ring electrode and separator of the electrode assembly 13 onto the current collector 14 is located in the peripheral portion 142. When the electrode assembly 13 is installed in the housing 11, the protrusion 151 abuts against the peripheral portion 142 to prevent the peripheral portion 142 from warping toward the wall portion 11a, thereby preventing the outer ring electrode and separator of the electrode assembly 13 from moving toward the wall portion 11a, avoiding electrode misalignment, and reducing the risk of short circuit and thermal runaway in the battery cell.

[0077] In this configuration, 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 abuts against the surrounding portion 142 to limit and support the surrounding portion 142, thereby restricting the surrounding portion 142 from warping toward the wall portion 11a. This restricts the misalignment between the outer plates of the electrode assembly 13 from causing short circuits and thermal runaway within the battery cell 10, thus improving the safety of the battery cell 10.

[0078] like Figure 4 As shown, in some embodiments of this application, the minimum distance from the protrusion 151 to the outer peripheral surface of the current collector 14 along the radial direction of the electrode terminal 12 is less than the minimum distance from the protrusion 151 to the outer peripheral surface of the electrode terminal 12.

[0079] It should be noted that the minimum distance from the protrusion 151 to the outer peripheral surface of the current collector 14 is less than the minimum distance from the protrusion 151 to the outer peripheral surface of the electrode terminal 12, meaning that the minimum distance from the same protrusion 151 to the outer peripheral surface of the current collector 14 is less than its minimum distance to the outer peripheral surface of the electrode terminal 12. After determining the position and shape of the protrusion 151 formed by the first insulating member 15, the minimum distance from the protrusion 151 to the outer peripheral surface of the current collector 14 is less than the minimum distance from the protrusion 151 to the outer peripheral surface of the electrode terminal 12.

[0080] In this configuration, since the outer ring of the electrode assembly 13 has a high probability of misalignment and a large amount of misalignment, the protrusion 151 is positioned closer to the outer peripheral surface of the current collector 14 and farther from the outer peripheral surface of the electrode terminal 12. This allows the protrusion 151 to limit and support the electrode that is farther from the electrode terminal 12, i.e., the outer ring of the electrode, reducing the probability of misalignment of the outer ring of the electrode and preventing short circuits and thermal runaway in the battery cell 10 due to misalignment of the outer ring of the electrode, thus improving the safety of the battery cell 10.

[0081] like Figure 5 As shown, Figure 5This is a partial enlarged view from perspective A for some embodiments of this application. In some embodiments of this application, there is a gap between the protrusion 151 and the current collecting member 14 along the thickness direction of the wall portion 11a.

[0082] If the protrusion 151 abuts against the current collector 14, during the process of installing the electrode assembly 13 into the housing, the protrusion 151 will exert a force on the current collector 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 housing and reduces the production efficiency of the battery cell 10.

[0083] Furthermore, if the protrusion 151 abuts against the current collector 14, and 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 collector 14 may cause a gap between the current collector 14 and the electrode terminal 12, thereby affecting the stability of the electrical connection between the current collector 14 and the electrode terminal 12. Therefore, a certain gap can be maintained between the protrusion 151 and the current collector 14 to eliminate the influence caused by factors such as manufacturing errors in the protrusion 151.

[0084] In this configuration, since the electrode terminal 12 needs to abut against the current collector 14 to achieve electrical connection, by providing a certain gap between the protrusion 151 and the current collector 14, interference between the protrusion 151 and the current collector 14 can be avoided, thus ensuring the stability of the electrical connection between the electrode terminal 12 and the current collector 14.

[0085] like Figure 6 and Figure 7 As shown, Figure 6 This is a schematic diagram illustrating the formation of annular protrusions in the first insulating element according to some embodiments of this application. Figure 7 This is a schematic diagram illustrating the formation of multiple protrusions in the first insulating member according to some embodiments of this application. In some embodiments of this application, the protrusion 151 is an annular protrusion 151 arranged around the central axis of the electrode terminal 12, or, the number of protrusions 151 is multiple, and the multiple protrusions 151 are distributed at intervals around the central axis of the electrode terminal 12.

[0086] like Figure 6 As shown, in some embodiments of this application, the protrusion 151 is an annular protrusion 151 arranged around the central axis of the electrode terminal 12. The annular protrusion 151 is not limited to a circle; it can also be elliptical, square, polygonal, etc., as long as the annular protrusion 151 forms a closed ring around the central axis of the electrode terminal 12.

[0087] like Figure 7As shown, in some embodiments of this application, there are multiple protrusions 151, which are spaced apart around the central axis of the electrode terminal 12. This spaced-apart distribution of the multiple protrusions 151 around the central axis of the electrode terminal 12 can mean that the multiple protrusions 151 are spaced apart on the same circumference around the central axis of the electrode terminal 12, or that the multiple protrusions 151 are spaced apart on different circumferences around the central axis of the electrode terminal 12. For example, a portion of the multiple protrusions 151 are spaced apart on a first circumference around the central axis of the electrode terminal 12, and another portion of the multiple protrusions 151 are spaced apart on a second circumference around the central axis of the electrode terminal 12. The diameters of the first and second circumferences are different, and the number of protrusions 151 on the first circumference and the number of protrusions 151 on the second circumference can be the same or different.

[0088] When there are multiple protrusions 151, the shape of the protrusions 151 can be cylindrical, prismatic, fan-shaped, fan-ring, etc.

[0089] It should be noted that this application does not limit the specific shape and number of protrusions 151, as long as the arrangement of protrusions 151 can provide a force along the axial direction of the electrode assembly 13 to the current collector 14 and the electrode assembly 13, so as to prevent the electrode from being misaligned.

[0090] Optionally, in some embodiments of this application, when multiple protrusions 151 are provided, the projected area of ​​the protrusions 151 farther from the electrode terminal 12 on the current collector 14 is larger, and the projected area of ​​the protrusions 151 closer to the electrode terminal 12 on the current collector 14 is smaller. Since the electrode terminal 12 can provide some support for the electrode sheet of the electrode assembly 13 closer to the electrode terminal 12, but cannot provide support for the electrode sheet of the electrode assembly 13 farther from the electrode terminal 12, it is necessary to provide more support for the electrode sheet of the electrode assembly 13 farther from the electrode terminal 12 to prevent misalignment. Correspondingly, the projected area of ​​the protrusions 151 farther from the electrode terminal 12 on the current collector 14 can be set larger to provide stable support for the electrode sheet farther from the electrode terminal 12.

[0091] Optionally, in some embodiments of this application, when multiple protrusions 151 are provided, the protrusions 151 farther from the electrode terminal 12 are more densely packed, while the protrusions 151 closer to the electrode terminal 12 are more sparsely packed. Similarly, since the electrode terminal 12 can provide some support for the electrode sheet of the electrode assembly 13 close to the electrode terminal 12, but cannot provide support for the electrode sheet of the electrode assembly 13 far from the electrode terminal 12, it is necessary to provide more support for the electrode sheet of the electrode assembly 13 far from the electrode terminal 12 to prevent misalignment of the electrode sheet of the electrode assembly 13 far from the electrode terminal 12. Correspondingly, the protrusions 151 far from the electrode terminal 12 can be arranged more densely to provide stable support for the electrode sheet far from the electrode terminal 12.

[0092] In this configuration, in embodiments where the protrusion 151 is an annular protrusion 151 arranged around the central axis of the electrode terminal 12, the annular protrusion 151 provides a more uniform limiting and supporting effect on the outer ring of the electrode assembly 13's electrode sheets and diaphragm, making it less prone to electrode misalignment in localized areas. In embodiments where there are multiple protrusions 151 spaced apart around the central axis of the electrode terminal 12, this spaced-apart arrangement reduces the material required for the first insulating member 15 and lowers the difficulty of molding the first insulating member 15.

[0093] like Figure 8 and Figure 9 As shown, Figure 8 This is a schematic diagram showing the insulating film covering the outer peripheral surface of the first electrode tab and the main body in some embodiments of this application. Figure 9 This is a partial enlarged view from perspective B of some embodiments of this application. In some embodiments of this application, the battery cell 10 further includes an insulating film 16, which covers the outer peripheral surfaces of the first tab 131 and the body 132, and extends between the protrusion 151 and the current collector 14.

[0094] To further reduce the short-circuit risk of the battery cell 10, the outer peripheral surfaces of the first tab 131 and the main body 132 need to be insulated from the outer casing 11. Therefore, an insulating film 16 is provided to cover the outer peripheral surfaces of the first tab 131 and the main body 132 to achieve insulation between the outer peripheral surfaces of the first tab 131 and the main body 132 and the outer casing 11.

[0095] like Figure 9As shown, in the embodiment where there is a gap between the protrusion 151 and the current collector 14 along the thickness direction of the wall portion 11a, the first insulating member 15 does not contact the current collector 14. Using only the first insulating member 15 to provide insulation between the current collector 14 and the wall portion 11a is ineffective, and there is still a risk of short circuit between the current collector 14 and the wall portion 11a. For example, a short circuit may occur between the outer peripheral surface of the current collector 14 and the wall portion 11a. To further improve the insulation effect between the current collector 14 and the wall portion 11a and prevent short circuits, the insulating film 16 can be extended between the protrusion 151 and the current collector 14, allowing the insulating film 16 to cover the current collector 14, thus improving the insulation effect between the current collector 14 and the wall portion 11a.

[0096] like Figure 9 As shown, when the insulating film 16 extends between the protrusion 151 and the current collector 14, if there is a gap between the protrusion 151 and the current collector 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 collector 14 can clamp and press the insulating film 16 to prevent the insulating film 16 from moving due to interference from external factors, so that the insulating film 16 can stably cover the current collector 14, the first tab 131 and the main body 132.

[0097] This arrangement, by covering the outer periphery of the first tab 131 and the main body 132 with the insulating film 16, provides insulation between the first tab 131 and the main body 132 and the outer shell 11, reducing the probability of short circuit between the first tab 131 and the main body 132 and the outer shell 11, thereby reducing the risk of short circuit in the battery cell 10 and improving the safety of the battery cell 10. Simultaneously, the insulating film 16 extends between the protrusion 151 and the current collector 14, allowing the protrusion 151 and the current collector 14 to clamp and press the insulating film 16, preventing it from shifting and improving the stability of the insulating film 16 covering the current collector 14, the first tab 131, and the main body 132.

[0098] like Figure 10 As shown, Figure 10 This is a schematic diagram of a battery cell 10 according to some embodiments of this application. In some embodiments of this application, the outer casing 11 includes a housing 111 and an end cap 112. The housing 111 includes a bottom wall 1111 and a side wall 1112. The side wall 1112 surrounds 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 to the bottom wall 1111. The end cap 112 covers the opening, and the wall portion 11a is either the bottom wall 1111 or the end cap 112.

[0099] The bottom wall 1111 and the side wall 1112 can be integrally formed, or the bottom wall 1111 and the side wall 1112 can be separately set and connected by welding, snap-fit ​​or other methods. Specifically, the side wall 1112 can be columnar, such as a cylinder or prism.

[0100] The side wall 1112 forms an opening at the other end relative to the bottom wall 1111, allowing the current collector 14 and electrode assembly 13 to be installed into the housing 111 through the opening. After the electrode assembly 13 is installed into the housing 111, the opening is sealed by covering it with the end cap 112. Furthermore, electrolyte needs to be added into the housing 11. When the end cap 112 covers the opening, a sealing element, such as a sealing ring or a sealing gasket, can be provided between the end cap 112 and the side wall 1112 to improve the sealing performance of the end cap 112 covering the opening and prevent electrolyte leakage from the housing 11.

[0101] The wall portion 11a being either a bottom wall 1111 or an end cap 112 includes two cases: one is that the wall portion 11a is a bottom wall 1111; the other is that the wall portion 11a is an end cap 112. In the embodiment where the wall portion 11a is a bottom wall 1111, after the electrode assembly 13 is installed into the housing 111, the current collector 14 faces the bottom wall 1111, and the heat-shrinkable film is located between the bottom wall 1111 and the current collector 14. In the embodiment where the wall portion 11a is an end cap 112, after the electrode assembly 13 is installed into the housing 111, the current collector 14 faces the end cap 112, and the heat-shrinkable film is located between the end cap 112 and the current collector 14.

[0102] In this configuration, the bottom wall 1111 and the side wall 1112 define a space for accommodating the electrode assembly 13, electrolyte and other structures, and the opening formed by the side wall 1112 is covered by the end cap 112, ensuring the airtightness of the outer casing 11.

[0103] like Figure 10 As shown, in some embodiments of this application, the electrode assembly 13 further includes a second electrode tab 133, which is formed at the end of the body 132 away from the wall portion 11a. The second electrode tab 133 has the opposite polarity to the first electrode tab 131 and is electrically connected to the wall portion 11a.

[0104] like Figure 10 As shown, the first tab 131 is located at the end of the electrode assembly 13 facing the wall portion 11a, and the second tab 133 is located at the end of the electrode assembly 13 away from the wall portion 11a. That is, the first tab 131 and the second tab 133 are respectively formed at both ends of the body 132 of the electrode assembly 13.

[0105] The first tab 131 and the second tab 133 have opposite polarities. For example, the first tab 131 is the positive tab of the electrode assembly 13, which is composed of the part of the positive electrode plate that does not have active material, and is electrically connected to the current collector 14 and the electrode terminal 12. The second tab 133 is the negative tab of the electrode assembly 13, which is composed of the part of the negative electrode plate that does not have active material, and is electrically connected to the outer shell 11 and the wall 11a.

[0106] In this configuration, the first tab 131 and the second tab 133 are located at both ends of the electrode assembly 13. The first tab 131 and the second tab 133 have good insulation, which reduces the risk of short circuit in the battery cell 10 and improves the safety of the battery cell 10.

[0107] Secondly, this application also provides a battery 100, which includes the aforementioned battery cell 10. Because a protrusion 151 is formed on the side of the first insulating member 15 facing the current collector 14 in the battery cell 10, it can support the electrode plates of the electrode assembly 13, reducing the probability of electrode plate misalignment during the insertion of the electrode assembly 13 into the casing, reducing the risk of short circuits and thermal runaway within the battery cell 10, thereby improving the safety of the battery 100.

[0108] Thirdly, this application also provides an electrical device that includes the aforementioned battery 100, which is used to provide electrical energy.

[0109] Fourthly, such as Figure 11 As shown, Figure 11 This is a schematic diagram illustrating a method for manufacturing a battery cell according to some embodiments of this application. This application also provides a method for manufacturing a battery cell 10. Specifically, the method for manufacturing the battery cell 10 is as follows:

[0110] S100, provides a housing 11 and electrode terminals 12, the housing 11 includes a wall portion 11a, and the electrode terminals 12 are insulatedly mounted on the wall portion 11a;

[0111] S200, an electrode assembly 13 is provided, the electrode assembly 13 includes a body 132 and a first electrode tab 131, the first electrode tab 131 being formed at one end of the body 132 near the wall portion 11a;

[0112] S300, a current collector 14 is provided, and the current collector 14 is connected to the first electrode 131;

[0113] S400, a first insulating member 15 is provided, and a protrusion 151 is formed on the side of the first insulating member 15 facing the current collector 14. Along the thickness direction of the wall portion 11a, the projection of the protrusion 151 on the current collector 14 does not overlap with the projection of the electrode terminal 12 on the current collector 14.

[0114] S500, the first insulating member 15 is disposed on the wall portion 11a, and the protrusion 151 is made to face away from the wall portion 11a;

[0115] S600, the electrode assembly 13 and the current collector 14 are placed into the housing 11;

[0116] S700, the current collector 14 is connected to the electrode terminal 12.

[0117] It should be noted that the above-described manufacturing method of battery cell 10 is only an illustration of the production process of battery cell 10 and does not represent the specific sequence of the production process of battery cell 10. The specific process flow can be formulated according to the actual situation during the production process of battery cell 10.

[0118] Fifthly, such as Figure 12 As shown, Figure 12 This is a schematic diagram of a battery cell manufacturing apparatus according to some embodiments of this application. This application also provides a battery cell manufacturing apparatus 2000, which includes a first supply device 2100, a second supply device 2200, a third supply device 2300, a fourth supply device 2400, a first assembly device 2500, a second assembly device 2600, a third assembly device 2700, and a fourth assembly device 2800.

[0119] Specifically, a first providing device 2100 provides a housing 11 and an electrode terminal 12. The housing 11 includes a wall portion 11a, and the electrode terminal 12 is insulatedly mounted on the wall portion 11a. A second providing device 2200 provides an electrode assembly 13, which includes a body 132 and a first tab 131. The first tab 131 is formed at one end of the body 132 near the wall portion 11a. A third providing device 2300 provides a current collector 14. A fourth providing device 2400 provides a first insulating member 15. A protrusion 151 is formed on the side of the first insulating member 15 facing the current collector 14. Along the thickness direction of the wall portion 11a, the projection of the protrusion 151 on the current collector 14 does not overlap with the projection of the electrode terminal 12 on the current collector 14. A first assembly device 2500 connects the current collector 14 to the first tab 131. The second assembly device 2600 is used to place the first insulating member 15 on the wall portion 11a and to make the protrusion 151 face away from the wall portion 11a. The third assembly device 2700 is used to place the electrode assembly 13 and the current collector 14 into the housing 11. The fourth assembly device 2800 is used to connect the current collector 14 to the electrode terminal 12.

[0120] In some embodiments of this application, such as Figures 3-9As shown, this application provides a battery cell 10. The battery cell 10 includes a housing 11, electrode terminals 12, electrode assembly 13, current collector 14, and a first insulating member 15. The housing 11 includes a wall portion 11a, and the electrode terminals 12 are insulatedly mounted on the wall portion 11a. The electrode assembly 13 is disposed within the housing 11, and the electrode assembly 13 includes a body 132 and a first tab 131, the first tab 131 being formed at one end of the body 132 near the wall portion 11a. The current collector 14 is disposed between the electrode assembly 13 and the wall portion 11a, and the current collector 14 is used to connect the first tab 131 and the electrode terminals 12. The first insulating member 15 is disposed between the current collector 14 and the wall portion 11a, and is used to insulate and isolate the current collector 14 and the wall portion 11a. In this design, a protrusion 151 is formed on the side of the first insulating member 15 facing the current collector 14. Along the thickness direction of the wall portion 11a, the projection of the protrusion 151 onto the current collector 14 does not overlap with the projection of the electrode terminal 12 onto the current collector 14. The projection of the protrusion 151 onto the current collector 14 is located in the peripheral portion 142, while the projection of the electrode terminal 12 onto the current collector 14 is located in the central portion 141. Simultaneously, the minimum distance between the protrusion 151 and the outer peripheral surface of the current collector 14 is less than the minimum distance between the protrusion 151 and the outer peripheral surface of the electrode terminal 12. A certain gap exists between the protrusion 151 and the current collector 14. The outer peripheral surfaces of the first tab 131 and the main body 132 of the electrode assembly 13 are covered by an insulating film 16, which extends between the protrusion 151 and the current collector 14.

[0121] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing, including the wall portion, is cylindrical in shape; Electrode terminals are insulated and mounted to the wall portion; An electrode assembly is disposed within the housing. The electrode assembly includes a main body and a first electrode tab, the first electrode tab being formed at one end of the main body near the wall portion. A current collector is disposed between the first electrode tab and the wall portion, and is used to connect the first electrode tab and the electrode terminal; A first insulating element is 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 the side of the first insulating member facing the current collecting member, and 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 along the thickness direction of the wall; there is a gap between the protrusion and the current collecting member along the thickness direction of the wall. Along the radial direction of the electrode terminal, the minimum distance from the protrusion to the outer peripheral surface of the current collector is less than the minimum distance from the protrusion to the outer peripheral surface of the electrode terminal.

2. The battery cell according to claim 1, characterized in that, The current collector includes a central portion and a peripheral portion. The projection of the electrode terminal on the current collector is located in the central portion, and the projection of the protrusion on the current collector is located in the peripheral portion.

3. The battery cell according to claim 1, characterized in that, The protrusion is an annular protrusion arranged around the central axis of the electrode terminal; Alternatively, the number of protrusions may be multiple, and the multiple protrusions may be distributed at intervals around the central axis of the electrode terminal.

4. The battery cell according to claim 1, characterized in that, The battery cell also includes an insulating film, which covers the outer peripheral surface of the first tab and the main body and extends between the protrusion and the current collector.

5. The battery cell according to claim 1, characterized in that, The outer casing includes a housing and an end cap. The housing includes a bottom wall and a side wall. The side wall surrounds 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 cap covers the opening. The wall portion is either the bottom wall or the end cap.

6. The battery cell according to any one of claims 1-5, characterized in that, The electrode assembly further includes a second electrode tab formed at one end of the body away from the wall portion. The second electrode tab has the opposite polarity to the first electrode tab and is electrically connected to the wall portion.

7. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-6.

8. An electrical device, characterized in that, Includes the battery as described in claim 7, the battery being used to provide electrical energy.

9. A method for manufacturing a single battery cell, characterized in that, include: A housing and electrode terminals are provided. The housing is cylindrical and includes a wall portion, and the electrode terminals are insulated and mounted on the wall portion. An electrode assembly is provided, the electrode assembly including a body and a first electrode tab, the first electrode tab being formed at one end of the body near the wall portion; A current collector is provided, and the current collector is connected to the first electrode tab; A first insulating member is provided, wherein a protrusion is formed on the side of the first insulating member facing the current collecting member, and 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 along the thickness direction of the wall; a gap exists between the protrusion and the current collecting member along the thickness direction of the wall. The first insulating member is disposed on the wall portion, and the protrusion is positioned away from the wall portion; Place the electrode assembly and the current collector into the housing; Connect the current collector to the electrode terminal; Along the radial direction of the electrode terminal, the minimum distance from the protrusion to the outer peripheral surface of the current collector is less than the minimum distance from the protrusion to the outer peripheral surface of the electrode terminal.

10. A manufacturing apparatus for a single battery cell, characterized in that, include: A first providing device is used to provide a housing and electrode terminals, the housing being cylindrical and including a wall portion, the electrode terminals being insulated and mounted on the wall portion; A second providing device is used to provide an electrode assembly, the electrode assembly including a body and a first electrode tab, the first electrode tab being formed at one end of the body near the wall portion; The third providing device is used to provide the current collection component; A fourth providing device is used to provide a first insulating member, wherein a protrusion is formed on the side of the first insulating member facing the current collecting member, and 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 along the thickness direction of the wall; a gap exists between the protrusion and the current collecting member along the thickness direction of the wall. A first assembly device is used to connect the current collector to the first electrode tab; A second assembly device is used to place the first insulating member on the wall portion and to make the protrusion face away from the wall portion; A third assembly device is used to place the electrode assembly into the housing; A fourth assembly device is used to connect the current collector to the electrode terminal; Along the radial direction of the electrode terminal, the minimum distance from the protrusion to the outer peripheral surface of the current collector is less than the minimum distance from the protrusion to the outer peripheral surface of the electrode terminal.

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