Cylindrical battery, manufacturing method for cylindrical battery, pressing apparatus for cylindrical battery, and electric device

Abstract

A manufacturing method for a cylindrical battery, a cylindrical battery, an electric device, and a pressing apparatus for a cylindrical battery. The manufacturing method for a cylindrical battery comprises: flattening a positive electrode tab of a cylindrical electrode assembly formed by winding such that the positive electrode tab has a first positive electrode tab height, and flattening a negative electrode tab of the electrode assembly such that the negative electrode tab has a first negative electrode tab height; and pressing the flattened positive electrode tab such that the positive electrode tab has a second positive electrode tab height, and pressing the flattened negative electrode tab such that the negative electrode tab has a second negative electrode tab height, the first positive electrode tab height being greater than the second positive electrode tab height, and the first negative electrode tab height being greater than the second negative electrode tab height.

Description

Cylindrical battery, manufacturing method of cylindrical battery, pressing device and electrical device for cylindrical battery

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510376449.6, filed on March 27, 2025, entitled "Cylindrical Battery, Method for Manufacturing Cylindrical Battery, Pressing Device and Electrical Device". Technical Field

[0003] This application relates to the field of cylindrical battery technology, and more particularly to a method for manufacturing a cylindrical battery, a cylindrical battery, an electrical device, and a device for pressing a cylindrical battery. Background Technology

[0004] In recent years, the application of batteries has become increasingly widespread, as evidenced by market trends. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively 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 battery applications, market demand is also constantly increasing.

[0005] The development of battery technology must consider multiple design factors simultaneously, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. Additionally, battery reliability must also be considered.

[0006] In related technologies, during the manufacturing process of cylindrical batteries, a large contact resistance is generated between the positive and negative electrode tabs and external connecting components, which affects the charging and discharging efficiency of the cylindrical battery.

[0007] Application content

[0008] This application aims to at least partially address one of the technical problems in the related art.

[0009] Therefore, this application proposes a method for manufacturing a cylindrical battery, which is beneficial for reducing the contact resistance between the positive and negative electrode tabs and external connecting components, and facilitates the adjustment of the height of the electrode assembly.

[0010] The second objective of this application is to propose a cylindrical battery.

[0011] The third objective of this application is to provide an electrical device.

[0012] The fourth objective of this application is to provide a pressing device for cylindrical batteries.

[0013] In a first aspect, this application proposes a method for manufacturing a cylindrical battery. The method includes: flattening the positive electrode tab of a wound cylindrical electrode assembly to give the positive electrode tab a first positive electrode tab height; flattening the negative electrode tab of the electrode assembly to give the negative electrode tab a first negative electrode tab height; upsetting the flattened positive electrode tab to give the positive electrode tab a second positive electrode tab height; upsetting the flattened negative electrode tab to give the negative electrode tab a second negative electrode tab height, wherein the first positive electrode tab height is greater than the second positive electrode tab height, and the first negative electrode tab height is greater than the second negative electrode tab height.

[0014] Therefore, by flattening the positive and negative electrode tabs separately, it is beneficial to improve the surface flatness of the positive and negative electrode tabs, reduce the contact resistance between the positive and negative electrode tabs and external connecting parts, and thus improve the charging and discharging efficiency of the cylindrical battery. By pressing the flattened positive and negative electrode tabs, the height of the positive and negative electrode tabs can be adjusted, thereby adjusting the height of the electrode assembly and the cylindrical battery. This also helps to improve the structural stability of the electrode assembly and reduce the risk of safety hazards caused by the shaking of the positive and negative electrode tabs.

[0015] Secondly, this application proposes a cylindrical battery, comprising: a housing having a positive electrode lead-out region and a negative electrode lead-out region; an electrode assembly disposed within the housing; the cylindrical battery being manufactured using the aforementioned cylindrical battery manufacturing method; a positive electrode tab having a second positive electrode tab height electrically connected to the positive electrode lead-out region, and a negative electrode tab having a second negative electrode tab height electrically connected to the negative electrode lead-out region.

[0016] Since cylindrical batteries are manufactured using the aforementioned cylindrical battery manufacturing method, it is beneficial to improve the charging and discharging efficiency of cylindrical batteries, and it is also convenient to adjust the height of cylindrical batteries. At the same time, it is beneficial to improve the structural stability of electrode components and reduce the risk of safety hazards caused by the shaking of positive and negative electrode tabs.

[0017] Thirdly, this application proposes an electrical device, which includes the aforementioned cylindrical battery.

[0018] The electrical device described above has the same advantages as the cylindrical battery mentioned above, and will not be repeated here.

[0019] Fourthly, this application proposes a cylindrical battery pressing device, which includes: a support member; an upsetting member, wherein the upsetting member and the support member are arranged in a first direction, and the two ends of the electrode assembly of the cylindrical battery are respectively clamped between the support member and the upsetting member; and a first driving member, which is used to drive the upsetting member to reciprocate relative to the support member in the first direction to adjust the distance between the upsetting member and the support member, wherein the upsetting member is used to upset the flattened positive electrode tab and negative electrode tab of the electrode assembly.

[0020] Therefore, by setting a first driving member, the first driving member can drive the pressing member to reciprocate relative to the support member in a first direction, thereby adjusting the distance between the pressing member and the support member. This allows the pressing device to be adapted to electrode assemblies of different heights, and it is beneficial to reduce the requirements for the processing accuracy and assembly accuracy of the pressing device, thereby reducing the processing and production cost of the pressing device and improving the production efficiency of the pressing device.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] Figure 1 is a simplified structural diagram of the electrical device described in an embodiment of this application;

[0023] Figure 2 is an axial cross-sectional view of the cylindrical battery described in an embodiment of this application;

[0024] Figure 3 is a simplified structural diagram of the electrode assembly described in an embodiment of this application;

[0025] Figure 4 is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application;

[0026] Figure 5 is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application.

[0027] Figure 6 is a schematic block diagram (3) of a method for manufacturing a cylindrical battery according to some embodiments of this application;

[0028] Figure 7 is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application.

[0029] Figure 8 is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application;

[0030] Figure 9 is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application (II).

[0031] Figure 10 is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application;

[0032] Figure 11 is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application;

[0033] Figure 12 is a structural schematic diagram of the pier pressing device described in an embodiment of this application;

[0034] Figure 13 is a partial structural schematic diagram of the pier pressing device described in an embodiment of this application;

[0035] Figure 14 is a partial structural schematic diagram of the pier pressing device described in an embodiment of this application;

[0036] Figure 15 is an enlarged view of point A in Figure 14;

[0037] Figure 16 is a partial structural schematic diagram of the pier pressing device described in the embodiment of this application;

[0038] Figure 17 is a schematic diagram of the support boss described in an embodiment of this application. Detailed Implementation

[0039] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0042] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0045] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0046] In this application, "multiple" means two or more (including two).

[0047] The battery mentioned in the embodiments of this application refers to a single physical module comprising multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application can be a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery generally includes a housing for encapsulating multiple battery cells or multiple battery modules, the housing preventing liquids or other foreign matter from affecting the charging or discharging of the battery cells; of course, a battery may also not include a housing.

[0048] A single battery cell typically includes a casing, a cell assembly, and an electrolyte. The casing houses the cell assembly and the electrolyte, and has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and separators.

[0049] A positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. The multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; alternatively, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0050] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. The multiple stacked negative electrode tabs can be directly soldered to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The multiple stacked negative electrode tabs are soldered to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is soldered to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited, and it can be, for example, polypropylene or polyethylene.

[0051] In recent years, the application of batteries has become increasingly widespread, as evidenced by market trends. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively 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 battery applications, market demand is also constantly increasing.

[0052] The development of battery technology must consider multiple design factors simultaneously, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. Additionally, battery reliability must also be considered.

[0053] In related technologies, during the manufacturing process of cylindrical batteries, a large contact resistance is generated between the positive and negative electrode tabs and external connecting components, which affects the charging and discharging efficiency of the cylindrical battery. Furthermore, the height of the electrode assembly of the cylindrical battery is not easy to adjust, which in turn affects the size of the cylindrical battery.

[0054] Based on the above considerations, in order to reduce the contact resistance inside the cylindrical battery and improve the convenience of adjusting the height of the electrode assembly, a method for manufacturing a cylindrical battery is proposed. The method includes: flattening the positive electrode tab of the wound cylindrical electrode assembly to give the positive electrode tab a first positive electrode tab height; flattening the negative electrode tab of the electrode assembly to give the negative electrode tab a first negative electrode tab height; upsetting the flattened positive electrode tab to give the positive electrode tab a second positive electrode tab height; upsetting the flattened negative electrode tab to give the negative electrode tab a second negative electrode tab height, wherein the first positive electrode tab height is greater than the second positive electrode tab height, and the first negative electrode tab height is greater than the second negative electrode tab height.

[0055] In the above technical solution, flattening the positive and negative electrode tabs separately improves their surface flatness and reduces the contact resistance between them and external connecting components, thereby improving the charging and discharging efficiency of the cylindrical battery. By pressing the flattened positive and negative electrode tabs, their height can be adjusted, thus adjusting the height of the electrode assembly and consequently the height of the cylindrical battery. This also improves the structural stability of the electrode assembly and reduces the risk of safety hazards caused by the shaking of the positive and negative electrode tabs.

[0056] The technical solutions described in this application are applicable to the manufacture of cylindrical batteries. Cylindrical batteries are suitable for various electrical devices that use cylindrical batteries, including but 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. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0057] For ease of explanation, the following embodiments use a vehicle as an example for the electrical device 200.

[0058] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle for the electrical device 200 provided in some embodiments of this application. The vehicle can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 203, which includes a cylindrical battery 100. The battery device 203 can be located at the bottom, front, or rear of the vehicle. The battery device 203 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller 201 and a motor 202. The controller 201 controls the battery to supply power to the motor 202, for example, to meet the vehicle's power needs during starting, navigation, and driving. In some embodiments of this application, the battery device 203 can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.

[0059] Please refer to Figures 2, 3, and 4. Figure 2 is an axial sectional view of the cylindrical battery provided in an embodiment of this application. Figure 3 is a simplified structural diagram of the electrode assembly provided in an embodiment of this application. Figure 4 is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application. This application provides a method for manufacturing a cylindrical battery, which includes:

[0060] Step S410: Flatten the positive electrode tab of the wound cylindrical electrode assembly so that the positive electrode tab has a first positive electrode tab height, and flatten the negative electrode tab of the electrode assembly so that the negative electrode tab has a first negative electrode tab height.

[0061] Step S420: Upsetting the flattened positive electrode tab to give it a second positive electrode tab height, and upsetting the flattened negative electrode tab to give it a second negative electrode tab height, wherein the first positive electrode tab height is greater than the second positive electrode tab height, and the first negative electrode tab height is greater than the second negative electrode tab height.

[0062] In the above technical solution, by flattening the positive electrode tab 121 and the negative electrode tab 122 respectively, it is beneficial to improve the surface flatness of the positive electrode tab 121 and the negative electrode tab 122, and to reduce the contact resistance between the positive electrode tab 121 and the negative electrode tab 122 and the external connecting parts, thereby improving the charging and discharging efficiency of the cylindrical battery 100. By pressing the flattened positive electrode tab 121 and the negative electrode tab 122, the height of the positive electrode tab 121 and the negative electrode tab 122 can be adjusted, thereby adjusting the height P of the electrode assembly 120, and further adjusting the height R of the cylindrical battery 100. It is also beneficial to improve the structural stability of the electrode assembly 120 and reduce the risk of safety hazards caused by the shaking of the positive electrode tab 121 and the negative electrode tab 122.

[0063] In step S410, the wound cylindrical electrode assembly 120 can first be placed into the flattening device. The flattening effect of the flattening device can be adjusted by adjusting the operating parameters of the flattening device (such as pressure and speed) so that the flattening effect of the flattening device can be adapted to the processing requirements. The flattening device flattens the positive electrode tab 121 so that the positive electrode tab 121 reaches the first positive electrode tab height L1. Similarly, the negative electrode tab 122 is flattened so that the negative electrode tab 122 reaches the first negative electrode tab height H1.

[0064] In step S420, the flattened electrode assembly 120 is transferred to the pressing device 300. The pressure and stroke of the pressing device 300 are adjusted according to the actual processing requirements so that the pressing effect of the pressing device 300 can be adapted to the processing requirements. The pressing device 300 presses the positive electrode tab 121 to further reduce the height of the positive electrode tab 121 to reach the second positive electrode tab height L2. Similarly, the pressing device 300 presses the negative electrode tab 122 to further reduce the height of the negative electrode tab 122 to reach the second negative electrode tab height H2.

[0065] Therefore, by flattening and pressing the positive electrode tab 121 and negative electrode tab 122 of the wound cylindrical electrode assembly 120, the height and flatness of the positive electrode tab 121 and negative electrode tab 122 are improved, which helps to improve the connection performance of the positive electrode tab 121 and negative electrode tab 122 and improve the safety of the cylindrical battery 100.

[0066] Please refer to Figures 3 and 5, where Figure 5 is a schematic block diagram (II) illustrating a method for manufacturing a cylindrical battery according to some embodiments of this application. In some embodiments of this application, the method further includes, before upsetting the positive and negative electrode tabs:

[0067] Step S411: Weld the positive electrode flat surface of the positive electrode tab to the positive electrode current collector, and weld the negative electrode flat surface of the negative electrode tab to the negative electrode current collector;

[0068] Step S413: Upset the positive current collector and the negative current collector so that the positive electrode tab has a second positive electrode tab height and the negative electrode tab has a second negative electrode tab height.

[0069] In the above technical solution, since the positive electrode tab 121 and the negative electrode tab 122 have high flatness after being flattened, the positive electrode flat surface of the positive electrode tab 121 and the negative electrode flat surface of the negative electrode tab 122 are highly flat. Therefore, welding the positive electrode flat surface of the positive electrode tab 121 to the positive electrode current collector 130 before pressing the positive electrode tab 121 is beneficial to increasing the welding area between the positive electrode tab 121 and the positive electrode current collector 130, thereby reducing the contact resistance between the positive electrode tab 121 and the positive electrode current collector 130. Similarly, before pressing the negative electrode tab 122, the negative electrode flat surface of the negative electrode tab 122 is welded to the negative electrode current collector 14. Welding 0 increases the welding area between the negative electrode tab 122 and the negative electrode current collector 140, thereby reducing the contact resistance between them. By pressing the positive electrode current collector 130 and the negative electrode current collector 140, the heights of the positive electrode tab 121 and the negative electrode tab 122 are adjusted, which also improves the connection strength between the positive electrode tab 121 and the positive electrode current collector 130, as well as the connection strength between the negative electrode tab 122 and the negative electrode current collector 140. This improves the structural stability of the cylindrical battery 100 and reduces the risk of failure.

[0070] After step S410, the positive electrode tab 121 has a first positive electrode tab height L1, and the negative electrode tab 122 has a first negative electrode tab height H1. Then, step S411 is performed. Step S411 may include transferring the electrode assembly 120 onto the welding device, aligning the center of the positive current collector 130 with the positive electrode mating plane of the positive electrode tab 121, and performing a welding operation to achieve welding between the positive current collector 130 and the positive electrode tab 121. Similarly, the center of the negative current collector 140 is aligned with the negative electrode mating plane of the negative electrode tab 122, and welding is performed to achieve welding between the negative current collector 140 and the negative electrode tab 122.

[0071] After step S411, step S413 is performed. Step S413 may include transferring the electrode assembly 120 to the pressing device 300. The pressure and stroke of the pressing device 300 are adjusted according to the actual processing requirements so that the pressing effect of the pressing device 300 can be adapted to the processing requirements. The pressing device 300 presses the positive electrode current collector 130, and the positive electrode current collector 130 causes the positive electrode tab 121 to deform, so that the positive electrode tab 121 has a second positive electrode tab height L2. Similarly, the pressing device 300 presses the negative electrode current collector 140, and the negative electrode current collector 140 causes the negative electrode tab 122 to deform, so that the negative electrode tab 122 has a second negative electrode tab height H2. Thus, it is convenient to adjust the height of the positive electrode tab 121 and the negative electrode tab 122, while improving the connection strength between the positive electrode tab 121 and the positive electrode current collector 130 and the connection strength between the negative electrode tab 122 and the negative electrode current collector 140.

[0072] Referring to Figure 3, in some embodiments of this application, the height of the first positive electrode tab ranges from 1.5mm to 3mm, and the height of the first negative electrode tab ranges from 1.5mm to 3mm.

[0073] The above technical solution is beneficial to improving the convenience of operation when welding the positive electrode tab 121 and the negative electrode tab 122, and is also beneficial to improving the connection strength between the positive electrode tab 121 and the positive current collector 130 and the connection strength between the negative electrode tab 122 and the negative current collector 140, and reducing the risk of short circuit in the cylindrical battery 100.

[0074] In some examples, the height L1 of the first positive electrode tab can be 1.5mm, 1.6mm, 2mm, 2.7mm or 3mm, etc. By making the value range of the height L1 of the first positive electrode tab satisfy 1.5mm≤L1≤3mm, it is easier to operate when welding the positive electrode tab 121 to the positive current collector 130, and it is also beneficial to improve the connection strength between the positive electrode tab 121 and the positive current collector 130. At the same time, it is beneficial to reduce the risk of short circuit caused by the positive electrode tab 121 contacting other components of the cylindrical battery 100.

[0075] When the height L1 of the first positive electrode tab is less than 1.5mm, the height of the first positive electrode tab is too small, resulting in a small area of ​​the positive electrode tab 121. This leads to a small contact area between the positive electrode tab 121 and the positive current collector 130, making it difficult to weld the positive electrode tab 121 to the positive current collector 130. It also results in poor connection strength between the positive electrode tab 121 and the positive current collector 130.

[0076] When the height L1 of the first positive electrode tab is greater than 3mm, the height of the first positive electrode tab is too large, which makes it easy for the positive electrode tab 121 to come into contact with other components of the cylindrical battery 100 (such as the negative electrode tab 122), thereby easily causing the cylindrical battery 100 to short circuit.

[0077] In some examples, the height L2 of the first negative electrode tab can be 1.5mm, 1.6mm, 2mm, 2.7mm or 3mm, etc. By making the value range of the height L2 of the first negative electrode tab satisfy 1.5mm≤L2≤3mm, it is easier to operate when welding the negative electrode tab 122 to the negative electrode current collector 140, and it is also beneficial to improve the connection strength between the negative electrode tab 122 and the negative electrode current collector 140. At the same time, it is beneficial to reduce the risk of short circuit caused by the negative electrode tab 122 coming into contact with other components of the cylindrical battery 100.

[0078] When the height L2 of the first negative electrode tab is less than 1.5mm, the height of the first negative electrode tab is too small, resulting in a small area of ​​the negative electrode tab 122. This leads to a small contact area between the negative electrode tab 122 and the negative electrode current collector 140, making it difficult to weld the negative electrode tab 122 to the negative electrode current collector 140. It also results in poor connection strength between the negative electrode tab 122 and the negative electrode current collector 140.

[0079] When the height L2 of the first negative electrode tab is greater than 3mm, the height of the first negative electrode tab is too large, which makes it easy for the negative electrode tab 122 to come into contact with other components of the cylindrical battery 100 (such as the negative electrode tab 122), thereby easily causing the cylindrical battery 100 to short circuit.

[0080] Referring to Figure 3, in some embodiments of this application, the difference between the height of the first positive electrode tab and the height of the second positive electrode tab is a first difference, and the difference between the height of the first negative electrode tab and the height of the second negative electrode tab is a second difference. The sum of the first difference and the second difference ranges from 0.5mm to 3.5mm.

[0081] In the above technical solution, by making the sum of the first difference and the second difference range from 0.5mm to 3.5mm, it is beneficial to improve the tightness of the electrode assembly 120, reduce the risk of misalignment and loosening of the positive electrode tab 121 and the negative electrode tab 122 of the electrode assembly 120, and improve the charging and discharging efficiency of the cylindrical battery 100; at the same time, it is beneficial to reduce the risk of the electrode assembly 120 being over-pressed, thereby reducing the risk of structural damage to the electrode assembly 120.

[0082] After flattening the electrode assembly 120, the heights of the positive electrode tab 121 and the negative electrode tab 122 are measured. The height of the positive electrode tab 121 is measured as the first positive electrode tab height L1, and the height of the negative electrode tab 122 is measured as the first negative electrode tab height H1. Then, the electrode assembly 120 is pressed down, reducing its height P. The height of the pressed electrode assembly 120 is then measured, and the heights of the positive electrode tab 121 and the negative electrode tab 122 are measured as the second positive electrode tab height L2. The difference between the first positive electrode tab height L1 and the second positive electrode tab height L2 is then calculated to obtain the first difference. The difference between the height H1 of the first negative electrode tab and the height H2 of the second negative electrode tab is used to obtain the second difference. The sum of the first difference and the second difference ranges from 0.5mm to 3.5mm. For example, the sum of the first difference and the second difference can be 0.5mm, 1.1mm, 1.5mm, 2.0mm or 3.5mm, etc. This is beneficial to improve the tightness of the contact between the positive electrode tab 121 and the negative electrode tab 122 and the connecting component (e.g., current collector), thereby increasing the contact area between the positive electrode tab 121 and the negative electrode tab 122 and the connecting component, thereby reducing the contact resistance, and thus improving the charging and discharging efficiency of the cylindrical battery 100.

[0083] When the sum of the first difference and the second difference is less than 0.5 mm, the stacking amount of the electrode assembly 120 is insufficient, resulting in poor tightness of the electrode assembly 120, which can easily lead to misalignment and loosening of the positive electrode tab 121 and the negative electrode tab 122. When the sum of the first difference and the second difference is greater than 3.5 mm, the electrode assembly 120 is over-stamped, and the electrode assembly 120 is prone to structural damage, which can affect the performance of the cylindrical battery 100.

[0084] Referring to Figure 3, in some embodiments of this application, the sum of the first difference and the second difference ranges from 1.8mm to 3.5mm.

[0085] In the above technical solution, by making the sum of the first difference and the second difference range from 1.8mm to 3.5mm, it is beneficial to further improve the tightness of the electrode assembly 120, thereby reducing the risk of misalignment and loosening of the positive electrode tab 121 and the negative electrode tab 122 of the electrode assembly 120, and also improving the charging and discharging efficiency of the cylindrical battery 100; at the same time, it is beneficial to reduce the risk of the electrode assembly 120 being over-pressed, thereby reducing the risk of structural damage to the electrode assembly 120.

[0086] The sum of the first and second differences can be 1.8mm, 2.0mm, 2.2mm, or 3mm, etc. When the sum of the first and second differences is less than 1.8mm, the stacking amount of the electrode assembly 120 is insufficient, that is, the stacking amount of the electrode assembly 120 cannot meet the production requirements, and the tightness of the electrode assembly 120 is poor, which can easily lead to misalignment and loosening of the positive electrode tab 121 and the negative electrode tab 122. When the sum of the first and second differences is greater than 3.5mm, the electrode assembly 120 is over-stamped, and the electrode assembly 120 is prone to structural damage, thereby affecting the performance of the cylindrical battery 100.

[0087] Referring to Figure 3, in some embodiments of this application, the axial height between the opposite sidewalls of the cylindrical battery casing 110 is 95 mm, the height of the first positive electrode tab and the height of the first negative electrode tab are both 1.5 ± 0.5 mm; the height of the electrode assembly having the second positive electrode tab height and the second negative electrode tab height is 88.4 ± 0.2 mm.

[0088] In the above technical solution, by adjusting the height of the positive electrode tab 121 and the negative electrode tab 122, it is beneficial to improve the utilization rate of the internal space of the cylindrical battery 100, increase the energy density of the cylindrical battery 100, and ensure that the height R of the cylindrical battery 100 can meet the processing requirements after assembly. At the same time, it is beneficial to improve the stability of the internal structure of the cylindrical battery 100.

[0089] After the electrode assembly 120 is flattened, the height L1 of the first positive electrode tab satisfies 1mm≤L1≤2mm. Similarly, the height H1 of the first negative electrode tab satisfies 1mm≤H1≤2mm. After pressing, the heights of the positive electrode tab 121 and the negative electrode tab 122 are further reduced. At this time, the height P of the electrode assembly 120 satisfies 88.2mm≤P≤88.6mm, which is beneficial for the cylindrical battery 100 to meet its height requirements. That is, it is beneficial for the cylindrical battery 100 to achieve a height R of 95mm. Furthermore, since the height P of the electrode assembly 120 is small, it occupies less space in the cylindrical battery 100, which is beneficial for saving space in the cylindrical battery 100 used for arranging active materials, thereby improving the energy density of the cylindrical battery 100.

[0090] Referring to Figure 3, in some embodiments of this application, the circumferential height between the opposite sidewalls of the cylindrical battery casing 110 is 125 mm, the height of the first positive electrode tab and the height of the first negative electrode tab are both 1.9 ± 0.9 mm; the height of the electrode assembly having the second positive electrode tab height and the second negative electrode tab height is 113.4 ± 0.2 mm.

[0091] In the above technical solution, by adjusting the height of the positive electrode tab 121 and the negative electrode tab 122, it is beneficial to improve the utilization rate of the internal space of the cylindrical battery 100, increase the energy density of the cylindrical battery 100, and ensure that the height R of the cylindrical battery 100 can meet the processing requirements after assembly. At the same time, it is beneficial to improve the stability of the internal structure of the cylindrical battery 100.

[0092] After the electrode assembly 120 is flattened, the height L1 of the first positive electrode tab satisfies 1mm≤L1≤2.8mm. Similarly, the height H1 of the first negative electrode tab satisfies 1mm≤H1≤2.8mm. After pressing, the heights of the positive electrode tab 121 and the negative electrode tab 122 are further reduced. At this time, the height P of the electrode assembly 120 satisfies 113.6mm≤P≤113.2mm, which is beneficial for the cylindrical battery 100 to meet its height requirements. That is, it is beneficial for the cylindrical battery 100 to achieve a height R of 125mm. Furthermore, since the height P of the electrode assembly 120 is small, it occupies less space in the cylindrical battery 100, which is beneficial for saving space in the cylindrical battery 100 used for arranging active materials, thereby improving the energy density of the cylindrical battery 100.

[0093] Please refer to Figure 6, which is a schematic block diagram (four) illustrating a method for manufacturing a cylindrical battery according to some embodiments of this application. In some embodiments of this application, the method further includes, before upsetting the positive and negative current collectors:

[0094] Step S412: Perform X-ray non-destructive testing on the electrode assembly.

[0095] In the above technical solution, performing X-ray non-destructive testing on the motor assembly before pressing the positive electrode current collector 130 and the negative electrode current collector 140 is beneficial to improving the safety of the cylindrical battery 100 and also to improving the product quality of the cylindrical battery 100.

[0096] Considering that during the flattening of the positive electrode tab 121 and the negative electrode tab 122, as well as the welding of the positive electrode flattened surface of the positive electrode tab 121 to the positive electrode current collector 130, and the welding of the negative electrode flattened surface of the negative electrode tab 122 to the negative electrode current collector 140, problems such as electrode misalignment may occur within the electrode assembly 120. To reduce the risk of short circuits or overheating of the cylindrical battery 100 during charging and discharging due to problems within the electrode assembly 120, X-ray non-destructive testing equipment can be used to perform X-ray non-destructive testing on the electrode assembly 120 before pressing the positive electrode current collector 130 and the negative electrode current collector 140. This allows for the timely detection and resolution of potential safety hazards in the electrode assembly 120 during the early stages of manufacturing the cylindrical battery 100, thereby improving the product quality of the cylindrical battery 100 and reducing its production and maintenance costs.

[0097] Please refer to Figure 7, which is a schematic block diagram (four) illustrating a method for manufacturing a cylindrical battery according to some embodiments of this application. In some embodiments of this application, after upsetting the positive and negative current collectors, the method further includes:

[0098] Step S414: Perform X-ray non-destructive testing on the electrode assembly.

[0099] In the above technical solution, by pressing the positive electrode current collector 130 and the negative electrode current collector 140 and then performing X-ray non-destructive testing on the electrode assembly 120, it is beneficial to improve the safety of the cylindrical battery 100 in use, and at the same time, it is beneficial to improve the product quality of the cylindrical battery 100.

[0100] During the pressing process of the positive electrode current collector 130 and the negative electrode current collector 140, the pressure applied by the pressing device 300 to the electrode assembly 120 may cause cracks at the weld joints of the positive electrode tab 121 and the positive electrode current collector 130, and the negative electrode tab 122 and the negative electrode current collector 140. In order to detect the defects in the electrode assembly 120 in a timely manner and assess the impact of pressing on the electrode assembly 120, X-ray non-destructive testing can be performed on the electrode assembly 120 after pressing the positive electrode current collector 130 and the negative electrode current collector 140. This will help to solve the problems in the electrode assembly 120 in a timely manner, improve the product quality of the cylindrical battery 100, and at the same time help to reduce the production and maintenance costs of the cylindrical battery 100.

[0101] Furthermore, since pressing the positive electrode current collector 130 and the negative electrode current collector 140 will give the positive electrode tab 121 a second positive electrode tab height L2 and the negative electrode tab 122 a second negative electrode tab height H2, X-ray non-destructive testing can be performed on the electrode assembly 120 after pressing the positive electrode current collector 130 and the negative electrode current collector 140. X-ray non-destructive testing can measure the height of the positive electrode tab 121 and the negative electrode tab 122 through imaging analysis, which is beneficial to ensure that the height of the positive electrode tab 121 and the negative electrode tab 122 meets the actual production requirements.

[0102] Please refer to Figures 3 and 8, where Figure 8 is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application. In some embodiments of this application, positive and negative electrode tabs are distributed at both ends of the electrode assembly along its axial direction, and the manufacturing method includes the following steps:

[0103] Step S510: Support the first axial end of the electrode assembly to the support member;

[0104] Step S520: Apply pressure to the second end of the electrode assembly along the axial direction to flatten the positive and negative electrode tabs.

[0105] In the above technical solution, applying pressure to the second end of the electrode assembly 120 along the axial direction to flatten the positive electrode tab 121 and the negative electrode tab 122 is beneficial to improving the flattening efficiency of the positive electrode tab 121 and the negative electrode tab 122, thereby improving the production efficiency of the cylindrical battery 100, and also improving the consistency of the flattening of the positive electrode tab 121 and the negative electrode tab 122, which is beneficial to improving the working performance of the cylindrical battery 100.

[0106] A positioning structure can be formed on the support member 310. The electrode assembly 120 is arranged on the support member 310 through the positioning structure to ensure the stability of the electrode assembly 120 when it is placed on the support member 310. The parameters of the pressure device used for flattening are adjusted according to the actual processing requirements so that the flattening effect of the pressure device on the electrode tabs is adapted to the actual production requirements. The pressure device is started, and the pressure device can apply pressure to the second axial end of the electrode assembly 120 so that the positive electrode tab 121 and the negative electrode tab 122 can be flattened respectively.

[0107] It should be noted that both the support member 310 and the pressure device can be components of the aforementioned kneading device. That is, the positive electrode tab 121 and the negative electrode tab 122 can be kneaded using a separately configured kneading device. Alternatively, both the support member 310 and the pressure device can be components of the aforementioned pressing device 300, so that the pressing device 300 can have the function of kneading the positive electrode tab 121 and the negative electrode tab 122. It is understood that whether the kneading of the positive electrode tab 121 and the negative electrode tab 122 is specifically achieved by a separately configured kneading device or by the pressing device 300 with kneading function can be determined in the actual processing and production process, and no specific limitation is made here.

[0108] Please refer to Figure 9, which is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application. In some embodiments of this application, the method for manufacturing a cylindrical battery further includes the following steps:

[0109] Step S521: Separate the electrode assembly from the support;

[0110] Step S522: Weld the positive current collector to the positive electrode flat surface, and weld the negative current collector to the negative electrode flat surface;

[0111] Step S523: Support one of the positive current collector and the negative current collector to the support member;

[0112] Step S530: Apply pressure to another of the positive and negative current collectors to upset the electrode assembly.

[0113] In the above technical solution, separating the electrode assembly 120 from the support member 310 facilitates subsequent welding work, thereby improving the reliability of the electrical connection of the electrode assembly 120 and the performance of the cylindrical battery 100. After welding, one of the positive electrode current collector 130 and the negative electrode current collector 140 is supported to the support member 310. The support member 310 can provide stable support for the electrode assembly 120, which helps to improve the stability of the electrode assembly 120, reduce the risk of the electrode assembly 120 shaking during the pressing process, and improve the pressing effect.

[0114] In the production process of the cylindrical battery 100, step S510 is performed first, which involves supporting the first axial end of the electrode assembly 120 to the support member 310. After completing step S510, step S520 is performed: pressure is applied to the second axial end of the electrode assembly 120 to flatten the positive electrode tab 121 and the negative electrode tab 122. After completing step S520, step S521 is performed, in which a mechanical device (e.g., a robotic arm) can be used to connect the electrode assembly 120 to the support member 310. After separation and completion of step S521, step S522 is further performed. Step S522 may include: transferring the electrode assembly 120 to the welding device, aligning the center of the positive current collector 130 with the positive electrode tab 121, and performing a welding operation to achieve welding between the positive current collector 130 and the positive electrode tab 121. Similarly, aligning the center of the negative current collector 140 with the negative electrode tab 122, and performing welding to achieve welding between the negative current collector 140 and the negative electrode tab 122.

[0115] After completing step S522, proceed to step S523. That is, after the positive electrode tab 121 is welded to the positive electrode current collector 130 and the negative electrode tab 122 is welded to the negative electrode current collector 140, the electrode assembly 120 can be transferred to the support member 310. One of the positive electrode current collector 130 and the negative electrode current collector 140 welded to the electrode assembly 120 is supported on the support member 310. The pressure and stroke of the pressing device 300 are adjusted according to the actual processing requirements so that the pressing effect of the pressing device 300 can be adapted to the processing requirements. When the negative electrode current collector 140 is supported on the support member 310, proceed to step S530, that is: the pressing device 300 can apply pressure to the positive electrode current collector 130. Pressure is applied to press the positive current collector 130, causing the positive current collector 130 to deform the positive electrode tab 121, giving the positive electrode tab 121 a second positive electrode tab height L2. When the positive current collector 130 is supported to the support member 310, the pressing device 300 applies pressure to the negative current collector 140 to press the negative current collector 140, causing the negative current collector 140 to deform the negative electrode tab 122, giving the negative electrode tab 122 a second negative electrode tab height H2. This facilitates the adjustment of the heights of the positive electrode tab 121 and the negative electrode tab 122, while also improving the connection strength between the positive electrode tab 121 and the positive current collector 130, as well as the connection strength between the negative electrode tab 122 and the negative current collector 140.

[0116] Please refer to Figures 3 and 10, where Figure 10 is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application. In some embodiments of this application, positive and negative electrode tabs are distributed at both ends of the electrode assembly along its axial direction, and the manufacturing method includes the following steps:

[0117] Step S610: Clamp the outer peripheral wall of the electrode assembly;

[0118] Step S620: Apply pressure to the electrode assembly from both ends of the axial direction to flatten the positive and negative electrode tabs.

[0119] In the above technical solution, by clamping the outer peripheral wall of the electrode assembly 120, the stability of the electrode assembly 120 is improved, the risk of the electrode assembly 120 shaking during the application of pressure to the electrode assembly 120 is reduced, and the clamping method of the outer peripheral wall of the electrode assembly 120 can avoid the axial ends of the electrode assembly 120, thereby facilitating subsequent welding operations. By applying pressure to the electrode assembly 120 from the axial ends of the electrode assembly 120 respectively to flatten the positive electrode tab 121 and the negative electrode tab 122, it is beneficial to make the positive electrode tab 121 and the negative electrode tab 122 uniform in the axial direction of the electrode assembly 120, and to reduce the risk of deformation of the electrode assembly 120 due to the force on one axial end of the electrode assembly 120, while also improving the flattening efficiency.

[0120] The pressing device 300 may be equipped with a clamping device 340, which can be used to clamp the electrode assembly 120. During the production process of the cylindrical battery 100, when the electrode assembly 120 is placed in the clamping station, the clamping device 340 can clamp the outer peripheral wall of the electrode assembly 120 to improve the stability of the electrode assembly 120 and reduce the risk of the electrode assembly 120 shifting. The pressing device 300 may be equipped with a pressure device. After the clamping device 340 stably clamps the electrode assembly 120, the pressure device can apply pressure to the electrode assembly 120 from both ends of the axial direction to flatten the positive electrode tab 121 and the negative electrode tab 122 respectively.

[0121] Compared to applying pressure to the positive electrode tab 121 and negative electrode tab 122 from one axial end of the electrode assembly 120 to flatten them, applying pressure to the positive electrode tab 121 and negative electrode tab 122 from both axial ends of the electrode assembly 120 to flatten them is beneficial to improve the uniformity of force on the positive electrode tab 121 and negative electrode tab 122 in the axial direction of the electrode assembly 120. When the pressure device applies pressure to the positive electrode tab 121 and negative electrode tab 122 from one axial end of the electrode assembly 120, the parts of the positive electrode tab 121 and negative electrode tab 122 that are far from the pressure device may have inconsistent flattening effects due to pressure attenuation, resulting in inconsistent flatness of at least a portion of the positive electrode flattening surface and the negative electrode flattening surface.

[0122] Furthermore, compared to applying pressure to the positive electrode tab 121 and negative electrode tab 122 from one axial end of the electrode assembly 120 to flatten them, applying pressure to the positive electrode tab 121 and negative electrode tab 122 from both axial ends of the electrode assembly 120 respectively helps reduce the risk of deformation of the electrode assembly 120. When the pressure device applies pressure to the electrode assembly 120 from one axial end, the electrode assembly 120 is prone to deformation such as tilting or bending due to the force on one side. However, applying pressure to the electrode assembly 120 from both axial ends of the electrode assembly 120 respectively helps to improve the balance of the force on both axial ends of the electrode assembly 120, thereby helping to reduce the risk of deformation of the electrode assembly 120.

[0123] Please refer to Figure 11, which is a schematic block diagram of a method for manufacturing a cylindrical battery according to some embodiments of this application. In some embodiments of this application, the method for manufacturing a cylindrical battery further includes the following steps:

[0124] Step S621: Weld the positive current collector to the positive electrode flat surface, and weld the negative current collector to the negative electrode flat surface;

[0125] Step S630: Apply pressure to the positive current collector and the negative current collector from both ends of the electrode assembly to upset the electrode assembly.

[0126] In the above technical solution, after the positive electrode tab 121 and the negative electrode tab 122 are flattened, the positive electrode current collector 130 and the positive electrode flattened surface can be directly welded, and the negative electrode current collector 140 and the negative electrode flattened surface can be welded. After welding, pressure can be applied to the positive electrode current collector 130 and the negative electrode current collector 140 respectively to press the electrode assembly 120. This helps to simplify the operation steps in the production process of the cylindrical battery 100, thereby improving the production efficiency of the cylindrical battery 100.

[0127] In the production process of the cylindrical battery 100, step S610 is performed first: the clamping device 340 is clamped on the outer peripheral wall of the electrode assembly 120. After step S610 is completed, step S620 is performed. In step S620, the pressure device can apply pressure to the electrode assembly 120 from both ends of the axial direction to flatten the positive electrode tab 121 and the negative electrode tab 122.

[0128] Since the clamping device 340 clamps the outer peripheral wall of the electrode assembly 120, the clamping device 340 can avoid the axial ends of the electrode assembly 120, reducing the risk of the clamping device 340 blocking the axial ends of the electrode assembly 120. After completing step S620, that is, flattening the positive electrode tab 121 and the negative electrode tab 122, step S621 is performed. In step S621, the flat surface of the positive electrode can be aligned with the positive electrode current collector 130, and a welding operation is performed to achieve the connection between the positive electrode current collector 130 and the positive electrode tab 122. Similarly, for welding 21, the negative electrode current collector 140 is aligned with the negative electrode flat surface and welding is performed to weld the negative electrode current collector 140 to the negative electrode tab 122. After welding is completed, that is, after step S621, step S630 is performed. In step S630, the pressing device 300 can apply pressure from both ends of the electrode assembly 120 toward the positive electrode current collector 130 and the negative electrode current collector 140 toward the axial center position of the electrode assembly 120 to complete the pressing of the electrode assembly 120.

[0129] In the above process, since the clamping device 340 can avoid the axial ends of the electrode assembly 120, after the positive electrode tab 121 and the negative electrode tab 122 are flattened, the welding operation can be performed without separating the clamping device 340 from the electrode assembly 120. After the welding is completed, the pressing operation can be performed without clamping the clamping device 340 from the electrode assembly 120 again. This simplifies the operation steps in the production process of the cylindrical battery 100, thereby improving the production efficiency of the cylindrical battery 100.

[0130] Referring to Figures 2 and 3, in some embodiments of this application, the cylindrical battery 100 includes: a housing 110 and an electrode assembly 120. The housing 110 has a positive electrode lead-out area and a negative electrode lead-out area. The electrode assembly 120 is disposed inside the housing 110. The cylindrical battery 100 is manufactured using the above-described manufacturing method for the cylindrical battery 100. A positive electrode tab 121 with a second positive electrode tab height L2 is electrically connected to the positive electrode lead-out area, and a negative electrode tab 122 with a second negative electrode tab height H2 is electrically connected to the negative electrode lead-out area.

[0131] In the above technical solution, since the cylindrical battery 100 is prepared by the above-mentioned manufacturing method of cylindrical battery 100, it is beneficial to improve the charging and discharging efficiency of the cylindrical battery 100, and it is easy to adjust the height R of the cylindrical battery 100. At the same time, it is beneficial to improve the structural stability of the electrode assembly 120 and reduce the risk of safety hazards caused by the shaking of the positive electrode tab 121 and the negative electrode tab 122.

[0132] In the production process of the cylindrical battery 100, the positive electrode sheet, separator, and negative electrode sheet are first wound into a cylindrical shape to form a cylindrical electrode assembly 120. The positive electrode tab 121 and the negative electrode tab 122 are distributed at both ends of the axial direction of the electrode assembly 120. The positive electrode tab 121 and the negative electrode tab 122 are flattened to improve the surface flatness of the positive electrode tab 121 and the negative electrode tab 122, which helps to reduce the contact resistance between the positive electrode tab 121 and the positive electrode lead-out area and the contact resistance between the negative electrode tab 122 and the negative electrode lead-out area, thereby helping to improve the charging and discharging efficiency of the cylindrical battery 100.

[0133] The flattened positive electrode tab 121 has a first positive electrode tab height L1, and the flattened negative electrode tab 122 has a first negative electrode tab height H1. The positive electrode tab 121 is further pressed to adjust the positive electrode tab 121 from the first positive electrode tab height L1 to the second positive electrode tab height L2, and the negative electrode tab 122 is pressed to adjust the negative electrode tab 122 from the first negative electrode tab height H1 to the second negative electrode tab height H2. This allows the height P of the electrode assembly 120 to be adjusted, making it easier to assemble the electrode assembly 120 into the housing 110.

[0134] After pressing, the electrode assembly 120 is placed into the housing 110. Since the positive electrode tab 121 is adjusted to the second positive electrode tab height L2 and the negative electrode tab 122 is adjusted to the second negative electrode tab height H2, placing the electrode assembly 120 into the housing 110 facilitates the alignment of the positive electrode tab 121 with the positive electrode lead-out area and the negative electrode tab 122 with the negative electrode lead-out area. Then, the positive electrode tab 121 with the second positive electrode tab height L2 can be electrically connected to the positive electrode lead-out area by welding. Similarly, the negative electrode tab 122 with the second negative electrode tab height H2 can be electrically connected to the negative electrode lead-out area by welding. This allows a complete current loop to be formed between the cylindrical battery 100 and the external device, and the electrical energy of the cylindrical battery 100 can be output to the external device and used by the external device.

[0135] Referring to Figure 2, in some embodiments of this application, the housing 110 includes: a cylindrical body portion 111, and a cover plate 112 is provided at the axial end of the body portion 111. One of the cover plates 112 is provided with a positive electrode post and a negative electrode post. The positive electrode post defines a positive electrode lead-out area, and the negative electrode post defines a negative electrode lead-out area.

[0136] In the above technical solution, the main body 111 can protect the electrode assembly 120, reducing the risk of damage to the electrode assembly 120 due to external impact. The cover plate 112 can seal the main body 111, which helps to reduce the risk of corrosion of the electrode assembly 120 due to dust and other impurities entering the cylindrical battery 100, thereby improving the service life of the cylindrical battery 100. By setting a positive terminal and a negative terminal on one of the cover plates 112, the cylindrical battery 100 can be electrically connected to external devices, and the capacity of the cylindrical battery 100 can be improved.

[0137] An installation space is formed inside the body part 111, and the electrode assembly 120 can be arranged in the installation space. Both axial ends of the body part 111 are provided with cover plates 112. The cover plates 112 can cover the axial ends of the body part 111 and be connected to the body part 111 to seal the installation space and reduce the risk of dust and other debris entering the installation space.

[0138] One of the two cover plates 112 is provided with a positive terminal and a negative terminal. That is, the positive terminal and the negative terminal are integrated into one cover plate 112 to improve the space utilization of the cover plate 112 with the positive terminal and the negative terminal, reduce the space required to arrange the positive terminal and the negative terminal, thereby enabling the cylindrical battery 100 to accommodate more active material in a limited space, and thus improving the capacity of the cylindrical battery 100.

[0139] The positive electrode post defines the positive electrode lead-out area, and the negative electrode post defines the negative electrode lead-out area. After the electrode assembly 120 is placed inside the housing 110, the positive electrode tab 121 with a second positive electrode tab height L2 is electrically connected to the positive electrode lead-out area, and the negative electrode tab 122 with a second negative electrode tab height H2 is electrically connected to the negative electrode lead-out area. This allows a complete current loop to be formed between the cylindrical battery 100 and the external device, and the electrical energy of the cylindrical battery 100 can be output to the external device and used by the external device.

[0140] Referring to Figure 2, in some embodiments of this application, the housing 110 includes: a cylindrical body portion 111, a cover plate 112 provided at the axial end of the body portion 111, one of the cover plates 112 being provided with a lead-out post, the lead-out post defining one of a positive lead-out area and a negative lead-out area, and the body portion 111 defining the other of the positive lead-out area and the negative lead-out area.

[0141] In the above technical solution, the main body 111 can protect the electrode assembly 120, reducing the risk of damage to the electrode assembly 120 due to external impact. The cover plate 112 can seal the main body 111, which helps to reduce the risk of corrosion of the electrode assembly 120 due to dust and other impurities entering the cylindrical battery 100, thereby improving the service life of the cylindrical battery 100. By providing a lead-out post on one of the cover plates 112, the lead-out post defines one of the positive lead-out area and the negative lead-out area, and the main body 111 defines the other of the positive lead-out area and the negative lead-out area, thereby increasing the distance between the positive and negative electrodes of the cylindrical battery 100, which helps to improve the electrical isolation effect of the cylindrical battery 100, and thus helps to improve the safety of the cylindrical battery 100.

[0142] An installation space is formed inside the body part 111, and the electrode assembly 120 can be arranged in the installation space. Both axial ends of the body part 111 are provided with cover plates 112. The cover plates 112 can cover the axial ends of the body part 111 and be connected to the body part 111 to seal the installation space and reduce the risk of dust and other debris entering the installation space.

[0143] One of the two cover plates 112 is provided with a lead-out post, which can define the positive lead-out area. The body part 111 can define the negative lead-out area. After the electrode assembly 120 is placed in the housing 110, the positive electrode tab 121 with a second positive electrode tab height L2 is electrically connected to the positive lead-out area, and the negative electrode tab 122 with a second negative electrode tab height H2 is electrically connected to the negative lead-out area. This can increase the distance between the positive and negative electrodes of the cylindrical battery 100, improve the electrical isolation effect of the cylindrical battery 100, and thus help improve the safety of the cylindrical battery 100.

[0144] In other examples, the lead-out post can define a negative lead-out area, the body portion 111 can define a positive lead-out area, the positive electrode tab 121 is electrically connected to the positive lead-out area, and the negative electrode tab 122 is electrically connected to the negative lead-out area.

[0145] It is understandable that the specific locations of the positive and negative electrode lead-out areas can be determined according to actual production requirements, and no specific restrictions are made here.

[0146] As shown in Figure 2, in some embodiments of this application, the cylindrical battery 100 further includes a positive current collector 130 and a negative current collector 140. The positive electrode tab 121 is electrically connected to the positive lead-out area through the positive current collector 130, and the negative electrode tab 122 is electrically connected to the negative lead-out area through the negative current collector 140.

[0147] In the above technical solution, by electrically connecting the positive electrode tab 121 to the positive electrode lead-out area through the positive electrode current collector 130, the positive electrode current collector 130 can support the positive electrode tab 121, which helps to reduce the risk of deformation or damage to the positive electrode tab 121. By electrically connecting the negative electrode tab 122 to the negative electrode lead-out area through the negative electrode current collector 140, the negative electrode current collector 140 can support the negative electrode tab 122, which helps to reduce the risk of deformation or damage to the negative electrode tab 122. Furthermore, this helps to improve the structural stability of the cylindrical battery 100 and extend the service life of the cylindrical battery 100.

[0148] The positive electrode tab 121 can be connected to the positive current collector 130 by welding. After the positive electrode tab 121 is welded to the positive current collector 130 and the negative electrode tab 122 is welded to the negative current collector 140, the positive current collector 130 can be connected to the positive lead-out area. This realizes the electrical connection between the positive electrode tab 121 and the positive lead-out area through the positive current collector 130. In this process, the positive current collector 130 can support the positive electrode tab 121 to reduce the risk of deformation of the positive electrode tab 121.

[0149] Similarly, the negative electrode tab 122 can be connected to the negative electrode current collector 140 by welding. After the negative electrode tab 122 and the negative electrode current collector 140 are welded, the negative electrode current collector 140 can be connected to the negative electrode lead-out area. This achieves electrical connection between the negative electrode tab 122 and the negative electrode lead-out area through the negative electrode current collector 140. In this process, the negative electrode current collector 140 can support the negative electrode tab 122 to reduce the risk of deformation of the negative electrode tab 122.

[0150] Furthermore, when the cylindrical battery 100 is assembled and put into use, the positive current collector 130 can still support the positive electrode tab 121, and the negative current collector 140 can still support the negative electrode tab 122, so as to improve the structural stability of the cylindrical battery 100 and thus help extend the service life of the cylindrical battery 100.

[0151] This application also provides a pressing device 300 for a cylindrical battery 100.

[0152] Please refer to Figure 12, which is a schematic diagram of the structure of the pressing device 300 for the cylindrical battery 100 provided in an embodiment of this application. In some embodiments of this application, the pressing device 300 for the cylindrical battery 100 includes: a support member 310, an upsetting member, and a first driving member 330. The upsetting member and the support member 310 are arranged in a first direction. The two ends of the electrode assembly 120 of the cylindrical battery 100 are respectively clamped between the support member 310 and the upsetting member. The first driving member 330 is used to drive the upsetting member to reciprocate relative to the support member 310 in the first direction to adjust the distance between the upsetting member and the support member 310. The upsetting member is used to upset the flattened positive electrode tab 121 and negative electrode tab 122 of the electrode assembly 120.

[0153] It should be noted that "first direction" can be understood as the axial direction of the cylindrical battery 100, and the specific direction can be shown in Figure 12.

[0154] In the above technical solution, by setting a first driving member 330, the first driving member 330 can drive the pressing member 320 to reciprocate relative to the support member 310 in a first direction, thereby adjusting the distance between the pressing member 320 and the support member 310, so that the pressing device 300 can be adapted to electrode assemblies 120 of different heights, and it is beneficial to reduce the requirements for the processing accuracy and assembly accuracy of the pressing device 300, thereby reducing the processing and production cost of the pressing device 300 and improving the production efficiency of the pressing device 300.

[0155] The support member 310 and the pressing member 320 are arranged opposite to each other in the first direction. The electrode assembly 120 can be arranged between the support member 310 and the pressing member 320 so that the support member 310 and the pressing member 320 can clamp the electrode assembly 120, thereby improving the stability of the electrode assembly 120 when pressing it.

[0156] The first driving member 330 can drive the pressing member 320 to reciprocate relative to the support member 310 in the first direction to adjust the distance between the pressing member 320 and the support member 310. When the distance between the pressing member 320 and the support member 310 is too large compared to the height P of the electrode assembly 120, the first driving member 330 can drive the pressing member 320 to move closer to the support member 310 along the first direction, so that the distance between the pressing member 320 and the support member 310 is adapted to the height P of the electrode assembly 120, thereby improving the clamping effect of the pressing member 320 and the support member 310 on the electrode assembly 120 and reducing the risk of the electrode assembly 120 shaking when pressing it.

[0157] When the distance between the pressing member 320 and the support member 310 is too small compared to the height P of the electrode assembly 120, the first driving member 330 can drive the pressing member 320 to move away from the support member 310 along the first direction, so that the distance between the pressing member 320 and the support member 310 is adapted to the height P of the electrode assembly 120, which makes it easier to arrange the electrode assembly 120 between the support member 310 and the pressing member 320, thereby making it easier for the pressing member 320 and the support member 310 to clamp the electrode assembly 120.

[0158] After the pressing member 320 and the support member 310 clamp the electrode assembly 120, the first driving member 330 can drive the pressing member 320 to move closer to the support member 310, so that the pressing member 320 can apply pressure to the electrode assembly 120, thereby upsetting the flattened positive electrode tab 121 and negative electrode tab 122 of the electrode assembly 120.

[0159] Therefore, by setting the first driving member 330 to drive the pressing member 320 to reciprocate in the first direction relative to the support member 310, the distance between the pressing member 320 and the support member 310 is adjusted, thereby adjusting the pressing effect of the pressing device 300 on the electrode assembly 120 and the adaptability of the pressing device 300 to different electrode assemblies 120. This allows the pressing device 300 to meet the pressing requirements of different electrode assemblies 120 while improving the versatility of the pressing device 300. Furthermore, since the driving effect of the first driving member 330 on the pressing member 320 can be adjusted during actual use, it is beneficial to reduce the requirements for the machining accuracy and assembly accuracy of the pressing device 300, thereby reducing the production cost of the pressing device 300 and improving the production and assembly efficiency of the pressing device 300.

[0160] Please refer to Figures 12 and 13, where Figure 13 is a partial structural schematic diagram of the pressing device 300 provided in an embodiment of this application. In some embodiments of this application, the first driving member 330 includes a driving rod 331 that reciprocates along a first direction, and the pressing member is disposed at the end of the driving rod 331.

[0161] In the above technical solution, by setting the pressing member 320 at the end of the driving rod 331, the pressing member 320 is connected to the first driving member 330 for transmission, which facilitates the first driving member 330 to drive the pressing member 320 to move back and forth, and thus facilitates the adjustment of the distance between the pressing member 320 and the support member 310.

[0162] The drive rod 331 can extend along the first direction, and a pressing member 320 is provided at the end of the drive rod 331 near the support member 310 in the first direction. The first drive member 330 can realize power output through the drive rod 331. That is, when the first drive member 330 is working, the drive rod 331 can move along the first direction towards the support member 310, or the drive rod 331 can move along the first direction away from the support member 310. The drive rod 331 can drive the pressing member 320 to move synchronously, thereby realizing the drive of the first drive member 330 on the pressing member 320 to adjust the distance between the pressing member 320 and the support member 310.

[0163] It is understandable that the specific direction of movement of the drive rod 331 can be determined during the actual pier pressing process, and no specific limitation is made here.

[0164] In some embodiments of this application, the first drive element 330 is an electric cylinder or a pneumatic cylinder.

[0165] In the above technical solution, by configuring the first driving component 330 as an electric cylinder or a pneumatic cylinder, it is beneficial to achieve precise driving of the pressing component 320. This makes it easier for the pressing effect of the pressing device 300 on the electrode assembly 120 to be adapted to the pressing requirements of the electrode assembly 120. It also helps to reduce the risk of over-pressing or under-pressing the electrode assembly 120 due to the low driving accuracy of the first driving component 330 on the pressing component 320.

[0166] In some examples, the first driving component 330 is an electric cylinder, which includes a motor and a driving rod 331. The driving rod 331 is connected to the motor for transmission. A pressing component 320 is provided at the end of the driving rod 331 away from the motor. When the motor is working, the motor can drive the driving rod 331 to move along a first direction. The driving rod 331 can drive the pressing component 320 at its end to move synchronously, thereby realizing the driving of the pressing component 320 by the first driving component 330. By configuring the first driving component 330 as an electric cylinder, it is beneficial to achieve precise control of the position, moving speed and pressure of the pressing component 320 on the electrode assembly 120. This is beneficial to make the pressing effect of the pressing device 300 on the electrode assembly 120 adapt to the pressing requirements of the electrode assembly 120.

[0167] In other examples, the first driving element 330 is a cylinder, which includes a cylinder barrel, a piston, and a driving rod 331. One end of the driving rod 331 is connected to the piston, and the other end of the driving rod 331 is provided with a pressing element 320. The piston can move in the cylinder barrel along a first direction, and the piston drives the driving rod 331 to move along the first direction. The driving rod 331 drives the pressing element 320 to move synchronously, thereby realizing the driving of the pressing element 330 to the pressing element 320. By configuring the first driving element 330 as a cylinder, the cylinder can adjust its power output effect by adjusting the intake pressure and flow rate, which is conducive to achieving precise control of the position, moving speed, and pressure applied by the pressing element 320 to the electrode assembly 120.

[0168] It is understandable that the specific structure of the first driving component 330 can be determined according to actual production requirements, and no specific limitations are made here.

[0169] Please refer to Figures 12, 13, and 16, where Figure 16 is a partial structural schematic diagram of the pressing device 300 according to an embodiment of this application. In some embodiments of this application, the pressing member 320 is formed in the shape of a flat plate.

[0170] In the above technical solution, by constructing the pressing component 320 as a flat plate, it is beneficial to improve the uniformity of the pressure applied by the pressing component 320 to the electrode assembly 120, and also beneficial to improve the production convenience and production efficiency of the pressing component 320, thereby improving the production efficiency of the pressing device 300.

[0171] The pressing member 320 can be constructed as a circular flat plate so that its shape can be adapted to the shape of the cylindrical electrode assembly 120. This facilitates the pressing member 320 pressing the electrode assembly 120. Furthermore, the flat plate shape of the pressing member 320 increases the contact area between the pressing member 320 and the electrode assembly 120, and also helps to ensure uniform contact between the pressing member 320 and the electrode assembly 120. This results in a more uniform distribution of pressure applied by the pressing member 320 to the electrode assembly 120, thereby improving the consistency of the pressing effect of the pressing member 320 on the electrode assembly 120. It also reduces the risk of differences within the electrode assembly 120 due to uneven pressure distribution applied by the pressing member 320, and ultimately improves the performance of the cylindrical battery 100.

[0172] In other examples, the pressing member 320 can be constructed into a flat plate structure of other shapes, such as a square flat plate. The specific shape of the pressing member 320 can be determined according to actual production requirements, and no specific limitation is made here, as long as the pressing member 320 is formed into a flat plate.

[0173] Referring to Figures 12, 13 and 16, in some embodiments of this application, the pressing device 300 further includes a clamping device 340 located between the support member 310 and the pressing member in a first direction, and the clamping device 340 defines a clamping space 341 for accommodating the cylindrical battery 100.

[0174] In the above technical solution, by setting a clamping device 340 between the support member 310 and the pressing member 320, the clamping device 340 can clamp and position the electrode assembly 120, which is beneficial to improving the stability of the electrode assembly 120 when it is placed in the pressing device 300, thereby improving the stability of the electrode assembly 120 when the pressing device 300 presses it, and further improving the uniformity of the pressing of the electrode assembly 120 by the pressing device 300.

[0175] The pressing member 320 and the support member 310 are spaced apart in the first direction. The clamping device 340 is arranged between the support member 310 and the pressing member 320. When it is necessary to press the electrode assembly 120, the electrode assembly 120 can be moved into the clamping space 341 defined by the clamping device 340. The clamping device 340 can clamp and fix the electrode assembly 120 to improve the stability of the electrode assembly 120. At this time, the electrode assembly 120 is located between the support member 310 and the pressing member 320. The support member 310 and the pressing member 320 can clamp the electrode assembly 120 at both ends of the axial direction of the electrode assembly 120 to further improve the stability of the electrode assembly 120.

[0176] The first driving member 330 can drive the pressing member 320 to move along the first direction toward the support member 310 to apply pressure to the electrode assembly 120 and achieve pressing of the electrode assembly 120. After the pressing device 300 completes pressing of the electrode assembly 120, the first driving member 330 can drive the pressing member 320 to move along the first direction away from the support member 310, and the electrode assembly 120 can be separated from the clamping device 340.

[0177] Referring to Figures 12, 13, and 16, in some embodiments of this application, the clamping device 340 includes a cylinder 342, a first gripper 343, and a second gripper 344. The first gripper 343 and the second gripper 344 are arranged in a second direction to define a clamping space 341. At least one of the first gripper 343 and the second gripper 344 is a movable gripper. The cylinder 342 is connected to the movable gripper to drive it to reciprocate. The first direction and the second direction are perpendicular to each other.

[0178] It should be noted that "first direction" can be understood as the axial direction of electrode assembly 120 or the height P direction of electrode assembly 120, and "second direction" can be understood as the radial direction of electrode assembly 120. For a specific direction diagram, please refer to Figure 13.

[0179] In the above technical solution, by connecting the cylinder 342 to the movable gripper to drive the movable gripper to move back and forth, the size of the clamping space 341 defined by the clamping device 340 can be adjusted so as to clamp or release the electrode assembly 120. At the same time, the clamping device 340 can clamp electrode assemblies 120 with different widths, thereby improving the versatility of the pressing device 300.

[0180] When the pressing device 300 is not needed to press the electrode assembly 120, the first gripper 343 and the second gripper 344 can be positioned far apart from each other in the second direction. At this time, the size of the clamping space 341 is large. When the pressing device 300 is needed to press the electrode assembly 120, the electrode assembly 120 can be moved into the clamping space 341 defined by the clamping device 340. The cylinder 342 drives the moving gripper to move. That is, the cylinder 342 drives at least one of the first gripper 343 and the second gripper 344 to move closer to the other in the second direction to reduce the size of the clamping space 341, so that the first gripper 343 and the second gripper 344 can clamp the electrode assembly 120. After the first gripper 343 and the second gripper 344 clamp the electrode assembly 120, the first driving member 330 can drive the pressing member 320 to move in the direction closer to the support member 310 to apply pressure to the electrode assembly 120, so as to realize the pressing device 300 pressing the electrode assembly 120.

[0181] After the pressing device 300 completes pressing the electrode assembly 120, the cylinder 342 can drive at least one of the first gripper 343 and the second gripper 344 to move away from the other direction along the second direction, so as to increase the size of the clamping space 341, so that the first gripper 343 and the second gripper 344 can release the electrode assembly 120, making it easier for the electrode assembly 120 to detach from the clamping space 341.

[0182] In some examples, the first gripper 343 can be configured as a movable gripper, and the cylinder 342 can drive the first gripper 343 to reciprocate relative to the second gripper 344; in other examples, the second gripper 344 can be configured as a movable gripper, and the cylinder 342 can drive the second gripper 344 to reciprocate relative to the first gripper 343; in still other examples, both the first gripper 343 and the second gripper 344 are configured as movable grippers, and the cylinder 342 can simultaneously drive the first gripper 343 and the second gripper 344 to move towards each other along a second direction, and the cylinder 342 can also simultaneously drive the first gripper 343 and the second gripper 344 to move away from each other along the second direction; it is understood that the specific configuration of the movable gripper can be determined according to actual production requirements, and is not specifically limited here.

[0183] Please refer to Figures 12, 13, 14, and 16, where Figure 14 is a partial structural schematic diagram of the pressing device 300 according to an embodiment of this application. In some embodiments of this application, the pressing device 300 further includes a mounting base 350, a cylinder 342 disposed on the mounting base 350, and a movable gripper movably disposed on the mounting base 350.

[0184] In the above technical solution, by setting the mounting base 350, the clamping device 340 can be positioned and installed. The mounting base 350 can provide stable support for the clamping device 340, which is beneficial to improving the stability of the clamping device 340 and reducing the risk that the clamping device 340 will shake and affect the clamping effect of the clamping member 320 on the electrode assembly 120.

[0185] In the first direction, the mounting base 350 can be arranged between the support member 310 and the pressing member 320, and is offset from the pressing member 320 and the support member 310 in the first direction. The cylinder 342 can be fixed on the mounting base 350 and is offset from the pressing member 320 and the support member 310 in the first direction to prevent the cylinder 342 and the mounting base 350 from interfering with the movement of the pressing member 320.

[0186] The clamping space 341 defined by the first gripper 343 and the second gripper 344 can be directly opposite the pressing member 320 and the support member 310 in the first direction, so that when the first gripper 343 and the second gripper 344 clamp and fix the electrode assembly 120, the electrode assembly 120 can be located between the pressing member 320 and the support member 310, thereby improving the pressing effect of the pressing member 320 on the electrode assembly 120.

[0187] Both the first gripper 343 and the second gripper 344 can be configured as movable grippers. The movable grippers are movably disposed on the mounting base 350 along the second direction. The cylinder 342 can drive the movable grippers to move on the mounting base 350 to selectively clamp or release the electrode assembly 120.

[0188] When the first gripper 343 and the second gripper 344 clamp the electrode assembly 120, the first gripper 343 and the second gripper 344 will bear the weight of the electrode assembly 120. At this time, the mounting base 350 stably supports the first gripper 343 and the second gripper 344 to reduce the risk of the first gripper 343 and the second gripper 344 shaking due to external force, and improve the clamping stability of the first gripper 343 and the second gripper 344 on the electrode assembly 120. This helps to reduce the risk that the pressing effect of the pressing member 320 on the electrode assembly 120 will be affected by the shaking of the clamping device 340.

[0189] Please refer to Figures 14 and 15, where Figure 15 is an enlarged view of point A in Figure 14. In some embodiments of this application, one of the mounting base 350 and the movable gripper is provided with a guide groove 345 and the other is provided with a guide protrusion 351. The guide protrusion 351 moves in conjunction with the guide groove 345 to guide the movement trajectory of the movable gripper.

[0190] In the above technical solution, by providing a guide groove 345 on one of the mounting base 350 and the movable gripper, and a guide protrusion 351 on the other, the movable gripper can be movably mounted on the mounting base 350. The cooperation between the guide protrusion 351 and the guide groove 345 can limit the movement direction of the movable gripper, allowing the movable gripper to move along the movement trajectory and reducing the risk of the movable gripper shaking.

[0191] The mounting base 350 may be provided with a guide groove 345 extending in the second direction, and the movable gripper may be provided with a guide protrusion 351. The guide protrusion 351 can be inserted into the guide groove 345 and move in cooperation with the guide groove 345. That is, the guide protrusion 351 can reciprocate in the guide groove 345 in the second direction, so that the movable gripper can be movably set on the mounting base 350, thereby facilitating the cylinder 342 to drive the movable gripper to reciprocate in the second direction.

[0192] In addition, the guide groove 345 can engage with the guide protrusion 351 in the first direction to restrict the movement of the guide protrusion 351 in the first direction, thereby helping to prevent the moving gripper from shaking in the first direction and improving the stability of the moving gripper.

[0193] In other examples, the mounting base 350 is provided with a guide protrusion 351, and the movable gripper is provided with a guide groove 345 extending in a second direction. The guide protrusion 351 can be inserted into the guide groove 345 and move in cooperation with the guide groove 345, thereby enabling the movable gripper to be movably mounted on the mounting base 350.

[0194] It is understandable that the specific positions of the guide groove 345 and the guide protrusion 351 can be determined according to actual production requirements, and no specific limitation is made here.

[0195] Referring to Figures 12 to 14, in some embodiments of this application, the pressing device 300 further includes an adjustment component 360 for adjusting the degree of freedom of the moving gripper in a first direction.

[0196] In the above technical solution, by setting the adjustment component 360, the degree of freedom of the moving gripper in the first direction is adjusted, so that the moving gripper can move in the first direction. This helps to reduce the risk of the pressing component 320 scratching the electrode assembly 120 due to the relative movement between the electrode assembly 120 and the moving gripper when pressing the electrode assembly 120.

[0197] When the movable gripper clamps the electrode assembly 120 and the electrode assembly 120 is spaced apart from the support member 310, since the support member 310 does not support the electrode assembly 120, when the pressing member 320 applies pressure to the electrode assembly 120, the electrode assembly 120 will move towards the support member 310 in the first direction. By setting the adjustment member 360, the movable gripper can move in the first direction through the adjustment member 360. When the electrode assembly 120 moves in the first direction, the motor assembly can drive the movable gripper to move synchronously in the first direction, thereby reducing the risk of relative movement between the electrode assembly 120 and the movable gripper, and thus reducing the risk of the movable gripper scratching the electrode assembly 120.

[0198] Therefore, when there are height differences between different electrode assemblies 120 or when there are positioning differences between the clamping device 340 and the electrode assembly 120, the adjustment component 360 is set so that the moving gripper can move with the electrode assembly 120 in the first direction, thereby reducing the risk of relative movement between the electrode assembly 120 and the moving gripper, which helps to reduce the risk of the moving gripper scratching the electrode assembly 120.

[0199] Referring to Figures 12 to 14, in some embodiments of this application, the adjustment component 360 is connected to the mounting base 350 to adjust the position of the mounting base 350, thereby achieving the degree of freedom to adjust the moving gripper.

[0200] In the above technical solution, by connecting the adjustment component 360 to the mounting base 350, the position of the mounting base 350 can be adjusted by the adjustment component 360. Since the movable gripper is set on the mounting base 350, the degree of freedom of the movable gripper can be adjusted by adjusting the position of the mounting base 350. This is beneficial to improving the convenience of adjusting the degree of freedom of the movable gripper, and also to improving the independence of the movable gripper's movement in the first and second directions, reducing the risk of the movable gripper shaking.

[0201] One of the mounting base 350 and the movable gripper is provided with a guide groove 345, and the other is provided with a guide protrusion 351. The guide protrusion 351 and the guide groove 345 are movably engaged to guide the movable gripper to move relative to the mounting base 350 in the second direction. The adjustment component 360 is connected to the mounting base 350 to adjust the position of the mounting base 350 in the first direction. Since the movable gripper is set on the mounting base 350, the movable gripper can be moved when the position of the mounting base 350 in the first direction is adjusted, thereby realizing the degree of freedom of the movable gripper in the first direction. That is to say, the movement of the movable gripper in the second direction can be driven by the cylinder 342, while the movement of the movable gripper in the first direction needs to be driven by the mounting base 350. This improves the independence of the movement of the movable gripper in the first direction and the movement of the movable gripper in the second direction, reduces the risk of the movable gripper shaking, and thus helps to improve the clamping effect of the movable gripper on the electrode assembly 120.

[0202] Referring to Figures 12 to 14, in some embodiments of this application, the adjustment assembly 360 includes an elastic element 361 connected to the mounting base 350, and the adjustment assembly 360 is configured to adjust the degree of freedom of the moving gripper using the elasticity of the elastic element 361.

[0203] In the above technical solution, by configuring the adjustment component 360 to adjust the degree of freedom of the moving gripper using the elasticity of the elastic element 361, it is beneficial to improve the flexibility of adjusting the degree of freedom of the moving gripper and facilitate the reset of the mounting base 350.

[0204] The mounting base 350 may be provided with an elastic element 361 at one end near the support member 310 in the first direction. The elastic element 361 can support the mounting base 350 in the first direction. When the electrode assembly 120 drives the movable gripper to move in the first direction towards the support member 310, the movable gripper drives the mounting base 350 to move in the first direction towards the support member 310. The mounting base 350 can compress the elastic element 361. After the pressing device 300 presses the electrode assembly 120, the first driving member 330 can drive the pressing member 320 to move away from the support member 310. At this time, the mounting base 350 can be reset under the drive of the elastic element 361. Thus, the degree of freedom of the movable gripper can be adjusted by using the elasticity of the elastic element 361.

[0205] Referring to Figures 12 to 14, in some examples of this application, the pressing device 300 further includes a slide rail 1 extending along a first direction. The slide rail 1 is used to arrange the mounting base 350. The mounting base 350 can slide and engage with the slide rail 1 in the first direction, so that the position of the mounting base 350 in the first direction is adjustable, thereby facilitating the adjustment component 360 to adjust the position of the mounting base 350.

[0206] The slide rail 1 can be arranged on the mounting base plate 3011 described below.

[0207] Referring to Figures 12 to 14, in some embodiments of this application, the mounting base 350 includes a base body 352 and a sliding part 353. A cylinder 342 and a movable gripper are provided on one side of the base body 352, and a sliding part 353 is provided on the other side of the base body 352. The sliding part 353 is used to slide and engage with the slide rail 1, so that the mounting base 350 can slide and engage with the slide rail 1 in a first direction, thereby facilitating the adjustment of the position of the mounting base 350.

[0208] The elastic element 361 is connected to the base body 352 to reduce the risk of mutual interference between the elastic element 361 and the slide rail 1, thereby improving the assembly convenience of the elastic element 361.

[0209] Referring to Figures 13 to 16, in some embodiments of this application, the elastic element 361 is a spring.

[0210] In the above technical solution, since springs have good elastic properties and low cost, configuring the elastic element 361 as a spring is beneficial to improving the elastic properties of the elastic element 361 and reducing the production cost of the pressing device 300.

[0211] Referring to Figures 12 and 13, in some embodiments of this application, the upsetting device 300 includes multiple sets of upsetting components. Each set of upsetting components includes a mounting base 3011, an upsetting component, and a first driving component 330, which are respectively mounted on the mounting base 3011. The upsetting device also includes a rotating base 370, which is rotatable about its central axis. Multiple sets of upsetting components are circumferentially spaced around the rotating base 370. There are multiple support members 310, which cooperate with the rotating base 370 to be driven to rotate by the rotating base 370.

[0212] In the above technical solution, by setting multiple sets of pressing components 301 and multiple support members 310, the pressing device 300 can simultaneously press multiple electrode components 120, which is beneficial to improving the pressing efficiency of the pressing device 300. Since the distance between the pressing component 320 and the corresponding support member 310 is adjustable, the pressing device 300 can simultaneously press electrode components 120 of different heights, which is beneficial to improving the versatility of the pressing device 300 and reducing the production and processing precision requirements of the pressing device 300, thus improving the assembly efficiency of the pressing device 300. In addition, by causing the rotating base 370 to drive the multiple support members 310 to rotate, the electrode components 120 are transported to the pressing device 300, which is beneficial to realizing the automated process of the pressing device 300 from electrode component 120 feeding, positioning, pressing to discharge, so that the pressing device 300 can form an assembly line operation, which is beneficial to improving the pressing efficiency of the pressing device 300, thereby improving the production efficiency of the cylindrical battery 100.

[0213] The mounting base plate 3011 can serve as the mounting carrier for the first driving member 330 and the pressing member 320, facilitating their installation while providing stable support. This improves the stability of the pressing member 320 when pressing the electrode assembly 120. The mounting base plates 3011 of the multiple pressing assemblies 301 are spaced apart around the rotating base 370, allowing the multiple pressing assemblies 301 to be spaced apart around the rotating base 370. Multiple support members 310 are spaced apart around the rotating base 370, and each support member 310 cooperates with the rotating base 370. The rotating base 370 can drive the multiple support members 310 to rotate, facilitating the feeding and discharging of the pressing device 300.

[0214] One of the multiple support members 310 can be opposite to the feeding direction of the pressing device 300 (i.e., the direction in which the electrode assembly 120 enters the pressing device 300). When the electrode assembly 120 enters the pressing device 300, it can be supported on one of the multiple support members 310 that is opposite to the feeding direction. Then, the rotating base 370 drives the multiple support members 310 to rotate synchronously, so that the support member 310 on which the electrode assembly 120 is arranged rotates from the feeding direction to a position that is offset from the feeding direction. At the same time, the support member 310 arranged adjacent to this support member 310 rotates to the feeding direction so that the next electrode assembly 120 can enter the pressing device 300.

[0215] When the pressing device 300 presses the electrode assembly 120, multiple pressing assemblies 301 can be set one-to-one with multiple support members 310, and an electrode assembly 120 can be arranged between each pressing assembly 301 and its corresponding support member 310. Multiple pressing assemblies 301 can press the electrode assembly 120 simultaneously to improve the pressing efficiency of the pressing device 300.

[0216] Referring to Figures 12 and 13, in some embodiments of this application, the rotating base 370 rotates to drive the support member 310 to reciprocate along a first direction.

[0217] In the above technical solution, by causing the rotating base 370 to drive the support member 310 to move back and forth along the first direction, the position of the support member 310 can be flexibly adjusted, and the support member 310 can support the electrode assembly 120.

[0218] The support member 310 and the rotating base 370 can be connected by a gear and a rack. The rotating base 370 can be connected to the gear, and the rack extends along the first direction. One end of the rack in the first direction meshes with the gear, and the other end of the rack in the first direction is connected to the support member 310. When the rotating base 370 rotates, the rotating base 370 can drive the gear to rotate. The gear drives the rack to move along the first direction, and the rack drives the support member 310 to rotate synchronously along the first direction. This realizes that the rotating base 370 rotates to drive the support member 310 to reciprocate along the first direction.

[0219] When it is necessary to press the electrode assembly 120, the rotating base 370 rotates to drive the support member 310 to move in the first direction toward the pressing member 320, so as to support the electrode assembly 120 clamped in the clamping device 340. When the electrode assembly 120 is supported by the support member 310, the first driving member 330 drives the pressing member 320 to move in the first direction toward the support member 310, so that the pressing member 320 can press the electrode assembly 120.

[0220] When the pressing device 300 has finished pressing the electrode assembly 120 and needs to discharge the material, the base 370 can be rotated in the opposite direction to drive the support 310 to move away from the pressing member 320 in the first direction, so that the electrode assembly 120 can be separated from the pressing device 300.

[0221] It is understood that the above-mentioned cooperation method between the rotating base 370 and the support 310 is only an example of this application and should not be construed as a limitation of this application. The cooperation method between the rotating base 370 and the support 310 can be determined according to actual production requirements and is not specifically limited here.

[0222] Please refer to Figures 12, 13, and 17, where Figure 17 is a structural schematic diagram of the support boss 371 according to an embodiment of this application. In some embodiments of this application, the rotating base 370 includes a support boss 371 and a rotation drive member 372, which drives the support boss 371 to rotate; the support boss 371 is provided with an annular slide rail 3711, and the height of the slide rail 3711 changes in the rotation direction of the support boss 371; the support member 310 is provided with a mating part 311 that cooperates with the slide rail 3711, and the mating part 311 drives the support member 310 to reciprocate.

[0223] In the above technical solution, by providing an annular slide rail 3711 on the support boss 371 and a mating part 311 on the support member 310, the support member 310 can slide and engage with the slide rail 3711. By changing the height of the slide rail 3711 in the rotation direction of the support boss 371, the height of the support member 310 can change when sliding along the slide rail 3711, thereby adjusting the position of the support member 310 in the first direction, so that the support member 310 can support the electrode assembly 120.

[0224] In the first direction, the support member 310 is disposed on the side of the support boss 371 near the pressing member 320, and the rotation drive member 372 can be disposed on the side of the support boss 371 away from the pressing member 320, so that the rotation drive member 372 can avoid the support member 310, reducing the risk of interference between the rotation drive member 372 and the support member 310, which is conducive to improving the assembly convenience of the rotation drive member 372 and the support member 310, thereby improving the assembly convenience of the pressing device 300. The rotation drive member 372 is connected to the support boss 371 in a transmission manner, so that the support boss 371 can rotate around the central axis of the support boss 371.

[0225] In the first direction, the support boss 371 is provided with an annular slide 3711 on one side where the support member 310 is provided. That is, the slide 3711 extends along the circumferential direction of the support boss 371. The support member 310 is provided with a mating part 311 that mates with the slide 3711. The support member 310 can slide with the slide 3711 through the mating part 311 and can reciprocate along the slide 3711.

[0226] In the rotation direction of the supporting boss 371, the height of the slide rail 3711 changes. In the clockwise direction, the height of the slide rail 3711 can gradually increase. When the support member 310 slides clockwise on the slide rail 3711 through the mating part 311, the height of the support member 310 gradually increases. That is, the support member 310 gradually moves closer to the pressing member 320 in the first direction, and the distance between the pressing member 320 and the support member 310 gradually decreases, so that the support member 310 can support the electrode assembly 120 located between the pressing member 320 and the support member 310. In the counterclockwise direction, the height of the slide rail 3711 can gradually decrease. When the support member 310 slides counterclockwise on the slide rail 3711 through the mating part 311, the height of the support member 310 gradually decreases. That is, the support member 310 gradually moves away from the pressing member 320 in the first direction, and the distance between the pressing member 320 and the support member 310 gradually increases.

[0227] Therefore, by cooperating with the height-changing slide rail 3711, the height of the support member 310 can change as it moves along the slide rail 3711, thereby adjusting the position of the support member 310 and facilitating the support member 310 to support the electrode assembly 120.

[0228] Referring to Figures 12, 13, and 17, in some embodiments of this application, the mating part 311 is a rotating part that rotates relative to the support member 310, and the rotating part is in rolling engagement with the slide rail 3711.

[0229] In the above technical solution, by constructing the mating part 311 as a rotating part that can rotate relative to the support member 310, the rotating part can roll into the slide rail 3711, reducing the friction between the rotating part and the slide rail 3711, which is beneficial to reducing the wear of the rotating part and the slide rail 3711, and also beneficial to improving the smoothness of the mating between the rotating part and the slide rail 3711, thereby improving the smoothness of the support member 310 sliding along the slide rail 3711.

[0230] The rotating component is mounted on the support 310 and can rotate relative to the support 310. At the same time, the rotating component can roll within the slide 3711 to drive the support 310 to move along the slide 3711. Compared with sliding friction, the rolling friction generated by the rotating component rolling in the slide 3711 is smaller. Therefore, it is beneficial to reduce the wear of the rotating component and the slide 3711, and to improve the smoothness of the cooperation between the rotating component and the slide 3711, thereby improving the efficiency of the support 310 sliding along the slide 3711.

[0231] Because of the change in height of the slide rail 3711, the height of the support member 310 can change when the rotating member drives the support member 310 to move along the slide rail 3711, thereby adjusting the position of the support member 310 in the first direction.

[0232] Referring to Figures 12, 13, and 17, in some embodiments of this application, the rotating component is a roller.

[0233] In the above technical solution, by constructing the rotating component as a roller, it is beneficial to reduce the friction between the rotating component and the slide 3711. Furthermore, since the roller can rotate freely, it can achieve rapid rotation and adjust the rotation direction under a small external force, which is beneficial to improve the movement flexibility of the rotating component.

[0234] In the first direction, a pivot can be provided at one end of the support member 310 near the support boss 371. The rotating member can be rotatably connected to the support member 310 through the pivot. At the same time, the rotating member can be embedded in the slide rail 3711 and can roll in the slide rail 3711. When the rotating member rolls in the slide rail 3711, the rotating member can drive the support member 310 to slide along the slide rail 3711.

[0235] Referring to Figure 12, in some embodiments of this application, the first direction is arranged parallel to the central axis of the rotating base 370.

[0236] In the above technical solution, by setting the first direction parallel to the central axis of the rotating base 370, the support member 310 is driven to move along the first direction when the rotating base 370 rotates around its central axis, thereby facilitating the adjustment of the position of the support member 310 in the first direction, and thus facilitating the support member 310 to support the electrode assembly 120.

[0237] When the rotating base 370 rotates around its central axis, the slide rail 3711 on the rotating base 370 rotates around its central axis. At the same time, the rotating component can roll in the slide rail 3711 and drive the support component 310 to slide along the slide rail 3711. Since the height of the slide rail 3711 changes, the height of the support component 310 can change under the action of the slide rail 3711. That is to say, the support component 310 can move in the first direction to adjust the position of the support component 310 in the first direction.

[0238] Referring to Figure 12, in some embodiments of this application, the rotating base 370 includes a rotating spindle 373 that can rotate relative to the supporting boss 371. The mounting base plates 3011 of multiple sets of pressing components 301 are arranged sequentially at intervals along the circumferential direction of the rotating spindle 373 and connected to the rotating spindle 373. The pressing component 320, the first driving component 330, the clamping device 340, and the support component 310 are all mounted on the mounting base plate 3011.

[0239] In the above technical solution, by mounting the pressing component 320, the first driving component 330, the clamping device 340, and the support component 310 on the mounting base plate 3011, it is beneficial to realize the modular assembly of the pressing device 300, thereby improving the assembly efficiency of the pressing device 300. By connecting the mounting base plate 3011 to the rotating spindle 373, the rotating spindle 373 can drive the mounting base plate 3011 to rotate relative to the supporting boss 371, thereby allowing the support component 310 to rotate relative to the supporting boss 371, which facilitates the adjustment of the height and speed of the support component 310 moving along the first direction.

[0240] The pressing device 300 may be equipped with an external drive assembly, which can be connected to the rotating spindle 373 to drive the rotating spindle 373 to rotate. When the rotating spindle 373 rotates, it can drive the mounting base 3011 and the components mounted on the mounting base 3011 to rotate. The rotating drive member 372 can drive the support boss 371 to rotate. When the support boss 371 rotates, its slide 3711 can drive the support member 310 to move along the first direction. Thus, by driving the support boss 371 and the rotating spindle 373 to rotate respectively, the rotating spindle 373 can drive the mounting base 3011 and the components on the mounting base 3011 to rotate relative to the support boss 371, thereby adjusting the distance and movement effect of the support member 310 along the first direction. This is beneficial to achieving precise driving of the support member 310, thereby improving the pressing accuracy of the pressing device 300 on the electrode assembly 120.

[0241] In some examples, the external drive components can be servo motors and speed reducers.

[0242] The pressing process of the pressing device 300 against the electrode assembly 120 is briefly described below with reference to Figures 12 to 17.

[0243] After the electrode assembly 120 separates from the cup-holding turret, it can enter the pressing device 300. When the electrode assembly 120 enters the pressing device 300, the cylinder 342 can drive the moving jaws to clamp the electrode assembly 120. After the moving jaws clamp the electrode assembly 120, the rotating spindle 373 can drive the mounting base 3011 to rotate, so that the support member 310 provided on the mounting base 3011 rotates relative to the support boss 371. The support member 310 can slide on the slide rail 371. Under the action of 711, it moves in the first direction toward the pressing member 320 so as to support the electrode assembly 120 located between the support member 310 and the pressing member 320. When the support member 310 is adjusted into place, it can also be understood that after the electrode assembly 120 is supported by the support member 310, the first driving member 330 can drive the pressing member 320 to move in the first direction toward the support member 310 so that the support member 310 and the pressing member 320 can clamp and press the electrode assembly 120.

[0244] After the pressing device 300 completes pressing the electrode assembly 120, the first driving member 330 can drive the pressing member 320 to move away from the support member 310 along the first direction. During this process, the rotating spindle 373 can drive the mounting base 3011 to rotate, so that the support member 310 provided on the mounting base 3011 rotates relative to the support boss 371. The support member 310 can move away from the pressing member 320 along the first direction under the action of the slide 3711 on the support boss 371, so that the support member 310 and the pressing member 320 can release the clamping of the electrode assembly 120. When the pressing device 300 reaches the docking position with the transition turntable, the cylinder 342 drives the moving jaw to move along the second direction to increase the clamping space, so that the moving jaw can release the electrode assembly 120 and the electrode assembly 120 can enter the cup turret.

[0245] The first driving member 330 can drive the pressing member 320 to move along the first direction by reading the rotation angle of the rotating spindle 373; similarly, the cylinder 342 can drive the moving gripper to clamp or release the electrode assembly 120 by reading the rotation angle of the rotating spindle 373.

[0246] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0247] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for manufacturing a cylindrical battery, wherein, include: The positive electrode tab of the wound cylindrical electrode assembly is flattened to give the positive electrode tab a first positive electrode tab height, and the negative electrode tab of the electrode assembly is flattened to give the negative electrode tab a first negative electrode tab height. The flattened positive electrode tab is upset to give the positive electrode tab a second positive electrode tab height, and the flattened negative electrode tab is upset to give the negative electrode tab a second negative electrode tab height. The first positive electrode tab height is greater than the second positive electrode tab height, and the first negative electrode tab height is greater than the second negative electrode tab height.

2. The method for manufacturing a cylindrical battery according to claim 1, wherein, Before upsetting the positive electrode tab and the negative electrode tab, the following steps are also included: The positive electrode flat surface of the positive electrode tab is welded to the positive electrode current collector, and the negative electrode flat surface of the negative electrode tab is welded to the negative electrode current collector. The positive current collector and the negative current collector are upset so that the positive electrode tab has a second positive electrode tab height and the negative electrode tab has a second negative electrode tab height.

3. The method for manufacturing a cylindrical battery according to claim 1 or 2, wherein, The height of the first positive electrode tab ranges from 1.5mm to 3mm, and the height of the first negative electrode tab ranges from 1.5mm to 3mm.

4. The method for manufacturing a cylindrical battery according to claim 3, wherein, The difference between the height of the first positive electrode tab and the height of the second positive electrode tab is the first difference value, and the difference between the height of the first negative electrode tab and the height of the second negative electrode tab is the second difference value. The sum of the first difference value and the second difference value ranges from 0.5mm to 3.5mm.

5. The method for manufacturing a cylindrical battery according to claim 4, wherein, The sum of the first difference and the second difference ranges from 1.8mm to 3.5mm.

6. The method for manufacturing a cylindrical battery according to claim 5, wherein, The axial height between the opposite sidewalls of the cylindrical battery casing is 95 mm, and the height of the first positive electrode tab and the height of the first negative electrode tab are both 1.5 ± 0.5 mm. The height of the electrode assembly having the second positive electrode height and the second negative electrode height is 88.4 ± 0.2 mm.

7. The method for manufacturing a cylindrical battery according to claim 5, wherein, The axial height between the opposite sidewalls of the cylindrical battery casing is 125 mm, and the height of the first positive electrode tab and the height of the first negative electrode tab are both 1.9 ± 0.9 mm. The height of the electrode assembly having the second positive electrode height and the second negative electrode height is 113.4 ± 0.2 mm.

8. The method for manufacturing a cylindrical battery according to claim 2, wherein, Before upsetting the positive current collector and the negative current collector, the following steps are also included: The electrode assembly was subjected to X-ray non-destructive testing.

9. The method for manufacturing a cylindrical battery according to claim 2 or 8, wherein, After upsetting the positive current collector and the negative current collector, the process further includes: The electrode assembly was subjected to X-ray non-destructive testing.

10. The method for manufacturing a cylindrical battery according to any one of claims 1-9, wherein, The electrode assembly has a positive electrode tab and a negative electrode tab distributed at both ends along its axial direction. The manufacturing method includes the following steps: The first axial end of the electrode assembly is supported to the support member. Pressure is applied to the second axial end of the electrode assembly to flatten the positive electrode tab and the negative electrode tab.

11. The method for manufacturing a cylindrical battery according to claim 10, wherein, It also includes the following steps: Separate the electrode assembly from the support member; The positive current collector is welded to the positive electrode flat surface, and the negative current collector is welded to the negative electrode flat surface. One of the positive current collector and the negative current collector is supported to the support member; Pressure is applied to another of the positive current collector and the negative current collector to upset the electrode assembly.

12. The method for manufacturing a cylindrical battery according to any one of claims 1-9, wherein, The electrode assembly has a positive electrode tab and a negative electrode tab distributed at both ends along its axial direction. The manufacturing method includes the following steps: The outer peripheral wall of the electrode assembly is clamped; Pressure is applied to the electrode assembly from both ends along its axial direction to flatten the positive electrode tab and the negative electrode tab.

13. The method for manufacturing a cylindrical battery according to claim 12, wherein, It also includes the following steps: The positive current collector is welded to the positive electrode flat surface, and the negative current collector is welded to the negative electrode flat surface. Pressure is applied to the positive current collector and the negative current collector from both ends of the electrode assembly to upset the electrode assembly.

14. A cylindrical battery, wherein, include: A housing having a positive electrode lead-out area and a negative electrode lead-out area; Electrode assembly, wherein the electrode assembly is disposed within the housing. The cylindrical battery is manufactured using the method for manufacturing a cylindrical battery according to any one of claims 1-13; the positive electrode tab having the height of the second positive electrode tab is electrically connected to the positive electrode lead-out region, and the negative electrode tab having the height of the second negative electrode tab is electrically connected to the negative electrode lead-out region.

15. The cylindrical battery according to claim 14, wherein, The housing includes: The body is cylindrical, and a cover plate is provided at the axial end of the body. One of the cover plates is provided with a positive electrode post and a negative electrode post. The positive electrode post defines the positive electrode lead-out area, and the negative electrode post defines the negative electrode lead-out area.

16. The cylindrical battery according to claim 14, wherein, The housing includes: The cylindrical body portion has a cover plate at its axial end, one of the cover plates having a lead-out post that defines one of the positive lead-out area and the negative lead-out area, and the body portion defining the other of the positive lead-out area and the negative lead-out area.

17. The cylindrical battery according to any one of claims 14-16, wherein, The cylindrical battery further includes a positive current collector and a negative current collector. The positive electrode tab is electrically connected to the positive lead-out area through the positive current collector, and the negative electrode tab is electrically connected to the negative lead-out area through the negative current collector.

18. An electrical appliance, wherein, Includes the cylindrical battery according to any one of claims 14-17.

19. An upsetting device for a cylindrical battery, wherein, include: Support components; An upsetting component, wherein the upsetting component and the support component are arranged in a first direction, and the two ends of the electrode assembly of the cylindrical battery are respectively clamped between the support component and the upsetting component; A first driving member is used to drive the upsetting member to reciprocate relative to the support member in a first direction to adjust the distance between the upsetting member and the support member. The upsetting member is used to upset the flattened positive electrode tab and negative electrode tab of the electrode assembly.

20. The upsetting apparatus for a cylindrical battery according to claim 19, wherein, The first driving member includes a driving rod that reciprocates along a first direction, and the upsetting member is disposed at the end of the driving rod.

21. The upsetting device for a cylindrical battery according to claim 20, wherein, The first driving component is an electric cylinder or a pneumatic cylinder.

22. The upsetting apparatus for a cylindrical battery according to any one of claims 19-21, wherein, The upsetting part is formed into a flat plate shape.

23. The upsetting apparatus for a cylindrical battery according to any one of claims 19-22, wherein, It also includes a clamping device, which is located between the support and the upsetting member in the first direction, and defines a clamping space for accommodating the cylindrical battery.

24. The upsetting device for a cylindrical battery according to claim 23, wherein, The clamping device includes a cylinder, a first clamp, and a second clamp. The first clamp and the second clamp are arranged in a second direction to define the clamping space. At least one of the first clamp and the second clamp is a movable clamp. The cylinder is connected to the movable clamp to drive it to reciprocate. The first direction and the second direction are perpendicular to each other.

25. The upsetting apparatus for a cylindrical battery according to claim 24, wherein, It also includes a mounting base, the cylinder is disposed on the mounting base, and the movable gripper is movably disposed on the mounting base.

26. The upsetting apparatus for a cylindrical battery according to claim 25, wherein, One of the mounting base and the movable gripper is provided with a guide groove and the other is provided with a guide protrusion. The guide protrusion moves in conjunction with the guide groove to guide the movement trajectory of the movable gripper.

27. The upsetting apparatus for a cylindrical battery according to claim 25 or 26, wherein, It also includes an adjustment component for adjusting the degree of freedom of the moving gripper in the first direction.

28. The upsetting apparatus for a cylindrical battery according to claim 27, wherein, The adjustment component is connected to the mounting base to adjust the position of the mounting base, thereby adjusting the degree of freedom of the moving gripper.

29. The upsetting device for a cylindrical battery according to claim 28, wherein, The adjustment assembly includes an elastic element connected to the mounting base, and the adjustment assembly is configured to adjust the degree of freedom of the moving gripper using the elasticity of the elastic element.

30. The upsetting apparatus for a cylindrical battery according to claim 29, wherein, The elastic element is a spring.

31. The upsetting apparatus for a cylindrical battery according to any one of claims 19-30, wherein, It includes multiple sets of upsetting assemblies, each set of upsetting assemblies includes a mounting base, the upsetting component and the first driving component, the upsetting component and the first driving component are respectively mounted on the mounting base; The upsetting device also includes: A rotating base, which is rotatable about its central axis; Multiple sets of the upsetting components are arranged circumferentially around the rotating base; There are multiple support members, and each of the multiple support members cooperates with the rotating base to be driven to rotate by the rotating base.

32. The upsetting device for a cylindrical battery according to claim 31, wherein, The rotating base rotates to drive the support member to reciprocate along the first direction.

33. The upsetting device for a cylindrical battery according to claim 32, wherein, The rotating base includes a supporting boss and a rotating drive component, the rotating drive component being used to drive the supporting boss to rotate. The support boss is provided with an annular slide rail, and the height of the slide rail changes in the direction of rotation of the support boss. The support member is provided with a mating part that cooperates with the slide rail, and the mating part drives the support member to reciprocate.

34. The upsetting device for a cylindrical battery according to claim 33, wherein, The mating part is a rotating component that rotates relative to the support member, and the rotating component rolls with the slide rail.

35. The upsetting apparatus for a cylindrical battery according to claim 34, wherein, The rotating component is a roller.

36. The upsetting apparatus for a cylindrical battery according to claim 31 or 32, wherein, The first direction is parallel to the central axis of the rotating base.

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