Cylindrical battery and electronic device

Abstract

Disclosed in the present application are a cylindrical battery and an electronic device. A housing comprises a first wall portion, an electrode assembly is disposed within the housing, and a current collector disc is disposed between the electrode assembly and the first wall portion. The current collector disc includes a first portion, a second portion, and a connection section. The connection section is connected between the first portion and the second portion, the second portion is folded relative to the first portion, the first portion is connected to the electrode assembly, and the second portion is connected to the first wall portion. The cylindrical battery further comprises a gasket, wherein the first portion and the second portion are disposed within an inner ring of the gasket, and the gasket is disposed between the electrode assembly and the first wall portion. The gasket provides buffering to weaken external forces transmitted to the current collector disc, thereby avoiding tearing of the current collector disc caused by instantaneous external forces. In addition, the gasket is supported between the electrode assembly and the first wall portion of the housing to limit the relative displacement between the electrode assembly and the housing bottom, thereby reducing the deformation or tearing of the current collector disc caused by displacement.

Description

cylindrical batteries and electronic devices Technical Field

[0001] This application relates to the field of battery technology, and in particular to a cylindrical battery and an electronic device. Background Technology

[0002] With the rapid development of portable electronic devices, electric vehicles and other fields, cylindrical batteries have been widely used due to their high energy density and good stability.

[0003] Cylindrical batteries typically include a casing, electrode assembly, and current collector. The current collector plays a crucial role in conducting electricity and collecting current in cylindrical batteries. One end of the current collector is connected to the electrode assembly, and the other end is connected to the casing or to the terminal post on the casing. The current collector is used to conduct the current generated by the electrode assembly to the external circuit. Summary of the Invention

[0004] However, the inventors of this application have discovered that when a cylindrical battery is subjected to a drop impact, the electrode assembly is prone to relative displacement with the casing. During the drop, the bending position of the current collector is subjected to repeated pulling and squeezing, which can easily lead to tearing at the bending position, resulting in increased internal resistance and short circuit safety risks.

[0005] In view of this, this application provides a cylindrical battery and electronic device designed to reduce tearing of the current collector.

[0006] In order to solve its technical problems, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, this application proposes a cylindrical battery, including a housing, an electrode assembly, and a current collector. The housing includes a first wall, the electrode assembly is disposed within the housing, and the current collector is disposed between the electrode assembly and the first wall. The current collector includes a first portion, a second portion, and a connecting portion. The connecting portion connects the first portion and the second portion, the second portion is folded over the first portion, the first portion is connected to the electrode assembly, and the second portion is connected to the first wall. The cylindrical battery also includes a gasket, the first portion and the second portion are disposed within the inner ring of the gasket, and the gasket is disposed between the electrode assembly and the first wall.

[0008] In the above technical solution, the gasket can absorb some of the impact force. When the cylindrical battery is subjected to external impact, such as a drop or collision, the gasket can act as a buffer, reducing the external force transmitted to the current collector, thereby reducing the risk of tearing of the current collector due to instantaneous external force. Furthermore, the gasket can distribute stress concentrated at a certain point on the current collector over a larger area. When the cylindrical battery is subjected to external force, it can reduce the excessive local stress on the current collector, thus reducing the risk of tearing. Additionally, the gasket, supported between the electrode assembly and the first wall of the housing, can limit the relative displacement between the electrode assembly and the bottom of the housing, thereby reducing deformation or tearing of the current collector caused by such displacement.

[0009] In some embodiments, along the axial direction of the cylindrical battery, the thickness of the first portion is T1, and the thickness of the second portion is T2. The thickness of the gasket is T, where 0.9(T1+T2)≤T≤1.1(T1+T2). This allows the gasket to effectively support the electrode assembly and the first wall, fully absorb impact forces, reduce stress concentration, thereby reducing tearing of the current collector and minimizing the impact on the energy density of the cylindrical battery.

[0010] In some embodiments, the radius of the first portion is R1, the radius of the second portion is R2, the radius of the electrode assembly is R3, the inner radius of the gasket is R4, and the outer radius of the gasket is R5, where R2≤R1≤R4<R5<R3. This facilitates a tight fit between the gasket and the electrode assembly and the first wall portion, reducing stress concentration and thus reducing tearing of the manifold.

[0011] In some embodiments, the gasket material includes at least one selected from polypropylene, polycarbonate, polyphenylene sulfide, polyetheretherketone, polyimide, or nylon. These materials offer superior cushioning, providing excellent buffering between the electrode assembly and the first wall portion, absorbing external impacts, and reducing stress transmitted to the current collector. Simultaneously, they possess high strength, providing stable support for the current collector and reducing its movement or deformation within the cylindrical cell.

[0012] In some embodiments, the cylindrical battery further includes a buffer member disposed at the connection portion and facing the first and second portions. By providing a buffer member at the connection portion, when the cylindrical battery is subjected to external impact or vibration, the buffer member can absorb part of the impact force, reducing the stress transmitted to the connection portion and helping to reduce the risk of breakage due to stress concentration at the connection portion. Furthermore, the buffer member allows for a more uniform distribution of stress at the connection portion, effectively reducing localized stress concentration and improving the overall strength and reliability of the current collector. Simultaneously, the buffer member can fill part of the gap between the first and second portions of the current collector, effectively reducing repeated stress on the connection portion, improving its fatigue resistance, extending the service life of the current collector, and reducing the risk of cylindrical battery failure.

[0013] In some embodiments, the buffer portion is located between the first portion and the second portion, allowing the buffer to fill part of the gap between the first and second portions, reducing tearing of the connection between the first and second portions due to excessive bending. Furthermore, the buffer provides additional protection for the manifold, reducing the impact force transmitted to the manifold and electrode assembly, thus reducing not only tearing of the manifold but also loosening of the electrode assembly due to impact.

[0014] In some embodiments, the buffer element comprises at least one of rubber, silicone, hot melt adhesive, or polypropylene. Rubber has high elasticity and can deform under external force, absorbing impact and reducing stress transmitted to the connection. Silicone is soft and can better conform to the surface of the manifold, providing a uniform cushioning effect. Hot melt adhesive melts rapidly upon heating and bonds the connection of the manifold, forming a strong connection. Polypropylene has high strength and toughness, can withstand certain mechanical stress, and can provide some support at the connection, reducing deformation or damage to the connection due to external forces.

[0015] In some embodiments, the surface of the first part facing the second part is provided with a plurality of first protrusions. When the first part and the second part are folded, the first protrusions can be supported between the first part and the second part, forming a transport space for the electrolyte, which facilitates the wetting of the electrode assembly by the electrode liquid. The first protrusions can also reduce tearing of the connection caused by excessive bending of the first part and the second part, thereby improving the overall strength of the first part.

[0016] In some embodiments, the surface of the second part facing the first part is provided with a plurality of second protrusions. These second protrusions support both the first and second parts, thereby increasing the strength of the second part and reducing the risk of tearing at the connection between the first and second parts due to excessive bending. Furthermore, when the first and second parts are not folded, the collector plate is sheet-like, allowing multiple collector plates to be stacked. The first and / or second protrusions create gaps between adjacent collector plates, facilitating their placement and removal.

[0017] In some embodiments, the thickness of the first part is T1, the thickness of the second part is T2, and the thickness of the connecting part is T3, where T3 < T1 and T3 < T2. By reducing the thickness of the connecting part, it can better adapt to deformation during the folding process, facilitating the uniform transfer of stress from one part to another. Furthermore, reducing the thickness of the connecting part can improve its flexibility, allowing it to better withstand deformation during bending and reducing tearing caused by excessive rigidity.

[0018] In some embodiments, 60% ≤ T3 / T1 ≤ 80% can improve the flexibility of the connecting part while giving it higher strength, which not only facilitates the folding of the first and second parts but also reduces tearing of the connecting part. Based on the same inventive concept, 60% ≤ T3 / T2 ≤ 80% can further improve the flexibility of the connecting part and give it higher strength, which not only facilitates the folding of the first and second parts but also further reduces tearing of the connecting part and gives both the first and second parts higher strength.

[0019] In some embodiments, along the axial direction of the cylindrical battery, the projection of the outer ring of the second portion at least partially overlaps with the projection of the outer ring of the first portion. When the electrode assembly and the housing undergo relative displacement, the partial overlap of the projections of the outer rings of the first and second portions increases the contact area between the first and second portions, forming mutual support, reducing stress concentration, improving the overall deformation resistance of the current collector, and thus reducing tearing of the current collector.

[0020] In some embodiments, the current collector is made of at least one of copper alloy, copper-nickel alloy, aluminum alloy, titanium alloy, stainless steel, or nickel-chromium alloy. All of these materials possess high mechanical strength, capable of withstanding the internal pressure of the cylindrical battery and external impact forces, thus reducing tearing of the current collector.

[0021] In some embodiments, a first portion is provided with a first through hole, and a second portion is provided with a second through hole. Along the axial direction of the cylindrical battery, the second through hole at least partially overlaps with the first through hole. The first and second through holes can serve as electrolyte transport channels, allowing the electrolyte to be directly transported to the electrode assembly through both the first and second through holes. This shortens the electrolyte transport path, enabling the electrode assembly to be more quickly and fully wetted by the electrolyte, thus improving the injection efficiency and the wetting efficiency of the electrolyte.

[0022] In some embodiments, the electrode assembly has a central hole, and along the axial direction of the cylindrical battery, the second through hole, the first through hole, and the central hole at least partially overlap. Electrolyte can be transported to the central hole through the second through hole and the first through hole, and the electrolyte can diffuse towards the electrode assembly at the central hole. This allows the electrolyte in the central hole to wet the electrode assembly from the inside, while externally free electrolyte wets the electrode assembly from the outside, improving the wetting efficiency and electrolyte injection efficiency of the electrode assembly.

[0023] Secondly, this application also proposes an electronic device including a cylindrical battery as described in any of the embodiments of the first aspect above.

[0024] Additional aspects and advantages of the embodiments of this application will be described, shown, or illustrated in part by way of implementation of the embodiments of this application in the following description. Attached Figure Description

[0025] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0026] Figure 1 is a schematic diagram of the structure of a cylindrical battery according to some embodiments of this application;

[0027] Figure 2 is an explosion diagram of a cylindrical battery according to some embodiments of this application;

[0028] Figure 3 is a cross-sectional schematic diagram of a cylindrical battery according to some embodiments of this application;

[0029] Figure 4 is a schematic diagram of the winding structure of the electrode assembly in some embodiments of this application;

[0030] Figure 5 is a schematic diagram of the unfolded structure of the collector disk in some embodiments of this application;

[0031] Figure 6 is a schematic diagram (top view) of the folding structure of the collector disk in some embodiments of this application;

[0032] Figure 7 is a schematic diagram (top view) of the folding structure of the collector disk in some embodiments of this application;

[0033] Figure 8 is a schematic diagram (front view) of the folded structure of the collector disk in some embodiments of this application;

[0034] Figure 9 is a schematic diagram (front view) of the folded structure of the collector disk in some embodiments of this application;

[0035] Figure 10 is a schematic diagram of the structure of the gasket and manifold according to an embodiment of this application;

[0036] Figure 11 is a partial cross-sectional schematic diagram of a cylindrical battery according to some embodiments of this application;

[0037] Figure 12 is a cross-sectional schematic diagram of the gasket and manifold in some embodiments of this application;

[0038] Figure 13 is a schematic diagram (front view) of the folding structure of the collector disk in some embodiments of this application;

[0039] Figure 14 is a schematic diagram of the structure of the first adhesive layer in some embodiments of this application.

[0040] Explanation of reference numerals in the attached drawings: 100, cylindrical battery; 10, casing; 10a, receiving cavity; 11, first wall portion; 12, second wall portion; 13, main body portion; 14, opening; 20, electrode assembly; 21, positive electrode plate; 22, negative electrode plate; 23, separator; 24, central hole; 30, current collector; 31, first part; 311, first protrusion; 312, first through hole; 32, second part; 321, second protrusion; 322, second through hole; 33, connecting part; 40, buffer; 50, gasket; 60, first adhesive layer; X, axial direction. Detailed Implementation

[0041] 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 some embodiments of this application, but not all embodiments.

[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 the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0044] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0045] The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0046] In a first aspect, this application proposes a cylindrical battery 100. Referring to Figures 1 to 3, the cylindrical battery 100 includes a housing 10, an electrode assembly 20, and a current collector 30. The housing 10 encloses a receiving cavity 10a, and the electrode assembly 20 is disposed in the receiving cavity 10a. The housing 10 includes a first wall portion 11, and the current collector 30 is disposed between the first wall portion 11 and the electrode assembly 20.

[0047] Referring to Figures 2 and 3, the housing 10 is used to house the electrode assembly 20 and the electrolyte (not shown in the figures). The electrolyte wets the electrode assembly 20 within the housing 10 to induce an electrochemical reaction. The housing 10 may be cylindrical, such as a cylinder, prism, or elliptical cylinder. The housing 10 includes a main body 13, a first wall 11, and a second wall 12. Along the axial direction X of the housing 10, the first wall 11 and the second wall 12 are disposed opposite to each other, and the first wall 11 and the second wall 12 are respectively connected to the two ends of the main body 13.

[0048] In some embodiments, the first wall portion 11 is integrally formed with the main body portion 13. For example, the main body portion 13 and the first wall portion 11 are integrally formed by directly extruding metal material using a cold extrusion molding process. During the cold extrusion process, the metal material used to prepare the shell is subjected to triaxial compressive stress, which can improve the utilization rate of the metal material and enhance the overall strength of the shell 10. An opening 14 is provided at one end of the main body portion 13 away from the first wall portion 11. The electrode assembly 20 can be placed into the shell 10 through the opening 14, and then the opening 14 is sealed by the second wall portion 12 to form a closed receiving cavity 10a. In other embodiments, the first wall portion 11 can also be separately formed from the main body portion 13. That is, the main body portion 13 adopts the form of openings 14 at both ends, and a closed receiving cavity 10a can be formed by connecting the first wall portion 11 and the second wall portion 12.

[0049] The casing 10 can be made of conductive metal materials such as aluminum, aluminum alloy, steel, stainless steel, nickel, copper or magnesium alloy, which allows the casing 10 to lead out a certain polarity of the cylindrical battery 100, for example, the casing 10 itself can be used as the positive or negative electrode of the cylindrical battery 100.

[0050] Referring to Figures 3 and 4, the outermost diameter of the electrode assembly 20 is smaller than the inner diameter of the housing 10, which facilitates the placement of the electrode assembly 20 within the housing 10. The electrode assembly 20 includes a positive electrode 21, a negative electrode 22, and a separator 23. The positive electrode 21, the separator 23, and the negative electrode 22 are stacked and wound together. The separator 23 is disposed between the positive electrode 21 and the negative electrode 22 to provide insulation between them.

[0051] Optionally, the negative electrode 22 of the electrode assembly 20 is electrically connected to the first wall portion 11 so that the first wall portion 11 leads out the negative electrode, and the positive electrode 21 of the electrode assembly 20 is electrically connected to the second wall portion 12 so that the second wall portion 12 leads out the positive electrode.

[0052] For example, the negative electrode 22 of the electrode assembly 20 may have a negative electrode empty foil area (not shown in the figure) without a negative electrode material layer, or the negative electrode 22 may be connected to multiple negative electrode tabs (not shown in the figure). The negative electrode empty foil area or the negative electrode tabs are positioned facing the first wall portion 11. By flattening the negative electrode empty foil area or the multiple negative electrode tabs to form a negative electrode flat surface, through-welding can directly connect the first wall portion 11 to the negative electrode flat surface, thereby leading out the negative electrode through the first wall portion 11. The positive electrode of the electrode assembly 20 can be similarly configured. By flattening the positive electrode empty foil area (not shown in the figure) or the multiple positive electrode tabs (not shown in the figure) of the positive electrode 21 to form a positive electrode flat surface, the second wall portion 12 can be electrically connected to the positive electrode flat surface, thereby leading out the positive electrode through the second wall portion 12. In some other embodiments, the second wall portion 12 may also lead out the negative electrode, while the first wall portion 11 leads out the positive electrode.

[0053] Taking the negative electrode led out from the first wall portion 11 as an example, for the above-mentioned current collector 30, please refer to Figure 3. The current collector 30 is disposed inside the housing 10. Along the axial direction X of the cylindrical battery 100, the current collector 30 is electrically connected between the electrode assembly 20 and the first wall portion 11 of the housing 10. For example, by means of welding or conductive adhesive connection, the two sides of the current collector 30 are electrically connected to the electrode assembly 20 and the first wall portion 11 of the housing 10 respectively, so that the negative electrode is led out from the first wall portion 11.

[0054] The current collector 30 effectively collects the current generated inside the cylindrical battery 100 and conducts it evenly and efficiently to the external circuit, ensuring stable and smooth current output and improving the charging and discharging performance and efficiency of the cylindrical battery 100. For example, in high-discharge-rate applications, the current collector 30 can quickly collect and transmit a large amount of current to meet the high-rate charging and discharging requirements of the cylindrical battery 100. Furthermore, the current collector 30 can be made of highly conductive materials, such as copper or aluminum, which reduces the transmission resistance of current within the cylindrical battery 100 and lowers energy loss. In addition, the current collector 30 provides mechanical support for the electrode assembly 20, increasing the overall structural strength and stability of the cylindrical battery 100. When the cylindrical battery 100 is subjected to external forces such as vibration and impact, the current collector 30 can reduce deformation and damage to the electrode assembly 20. Simultaneously, the current collector 30 provides a more convenient connection point, making the connection between the electrode assembly 20 and the first wall 11 simpler and more reliable.

[0055] In some other embodiments, the housing 10 may include another collector plate 30, through which the positive electrode plane of the electrode assembly 20 is electrically connected to the second wall portion 12 or the electrode post on the second wall portion 12 to lead out the positive electrode. Alternatively, the first wall portion 11 may also be provided with an electrode post, and the positive electrode plate 21 can be directly electrically connected to the electrode post on the first wall portion 11 through the collector plate 30.

[0056] Please refer to Figures 5 and 6, where Figure 5 shows the unfolded structure of the collector plate 30, and Figure 6 shows the folded structure of the collector plate 30. The collector plate 30 includes a first part 31, a second part 32, and a connecting part 33. The connecting part 33 connects the first part 31 and the second part 32. The second part 32 is folded along the first part 31, for example, the second part 32 is folded towards the first part 31 along the connecting part 33. After folding, the first part 31 is connected to the electrode assembly 20, and the second part 32 is connected to the first wall part 11.

[0057] The folding design of the current collector 30 better adapts to the internal space of the cylindrical battery 100. Through folding, the current collector 30 can achieve electrical connection with the electrode assembly 20 and the first wall 11 without occupying too much space, while maintaining a certain degree of flexibility to adapt to the volume changes of the cylindrical battery 100 during charging and discharging. For example, during the charging and discharging of the cylindrical battery 100, the electrode plates will expand and contract. The folded current collector 30 has a certain buffering capacity and can adjust its shape according to the changes in the electrode plates, reducing damage caused by stress concentration.

[0058] In some embodiments, referring to Figures 3, 5, and 6, a first portion 31 is provided with a first through hole 312, and a second portion 32 is provided with a second through hole 322. After the first portion 31 and the second portion 32 are folded, the second through hole 322 at least partially overlaps with the first through hole 312 along the axial direction X of the cylindrical battery 100. The first through hole 312 and the second through hole 322 can serve as electrolyte transport channels, allowing the electrolyte to be directly transported to the electrode assembly 20 through the first through hole 312 and the second through hole 322. This shortens the electrolyte transport path, enabling the electrode assembly 20 to be more quickly and fully wetted by the electrolyte, thus improving the electrolyte injection efficiency and the electrolyte wetting efficiency.

[0059] In some other embodiments, the electrode assembly 20 forms a central hole 24 after winding. Along the axial direction X of the cylindrical battery 100, the second through hole 322, the first through hole 312, and the central hole 24 at least partially overlap. The electrolyte can be transported to the central hole 24 through the second through hole 322 and the first through hole 312. The electrolyte can diffuse towards the electrode assembly 20 at the central hole 24, which means that the electrolyte in the central hole 24 wets the electrode assembly 20 from the inside, while the free electrolyte outside wets the electrode assembly 20 from the outside, thereby improving the wetting efficiency and liquid injection efficiency of the electrode assembly 20.

[0060] The inventors of this application have discovered that when the cylindrical battery 100 is subjected to impacts such as drops or collisions, the current collector 30 will generate an instantaneous impact force, and the electrode assembly 20 will undergo relative displacement or have a tendency to do so with the casing 10. This can easily cause stress concentration in the connection part 33, and the connection part 33 is prone to forming obvious geometrical abrupt changes. Such abrupt changes will lead to increased local stress concentration, causing the connection part 33 to bear excessive stress, which in turn can cause the connection part 33 to tear.

[0061] To reduce the tearing problem of the connection portion 33, in the embodiments of this application, referring to Figure 5, the radius of the first part 31 is R1, and the radius of the second part 32 is R2, |R1-R2|≤1mm. By reducing the radius difference between the second part 32 and the first part 31, the structure of the current collector 30 can be made more stable, better able to withstand the internal pressure of the cylindrical battery 100 and external mechanical impact, and the stress can be more evenly distributed between the first part 31 and the second part 32, reducing stress concentration in the connection portion 33, thereby reducing the risk of tearing of the current collector 30. Furthermore, the smaller radius difference makes the connection between the two parts of the current collector 30 and the electrode assembly 20 and the first wall portion 11 easier and more reliable, with a larger contact area, which improves the connection strength. This not only improves the consistency of the production of the cylindrical battery 100, but also reduces the connection resistance between the current collector 30 and the electrode assembly 20 and the first wall portion 11, which is beneficial to improving the charge and discharge rate of the cylindrical battery 100.

[0062] The radius of the first part 31 can be the radius of the first part 31 itself, or it can be the radius of the fitted circle, i.e., the equivalent circle, where the first part 31 is located. The second part 32 is similar.

[0063] In some embodiments, 0mm≤R1-R2≤1mm, and the first portion 31, which serves as the part connected to the electrode assembly 20, has a larger radius, allowing it to better accommodate the shape and size of the electrode assembly 20. This helps to improve the utilization of the internal space of the cylindrical battery 100, providing more space for the active material and thus increasing the energy density of the cylindrical battery 100. For example, in a cylindrical battery 100 designed for a compact electronic device, this optimized space utilization can store more energy within a limited volume.

[0064] If the radius of the second part 32 is too large, and when the radius of the second part 32 is greater than the radius of the electrode assembly 20, it will cause an excessive gap between the electrode assembly 20 and the housing 10, which will lead to a loss of energy density in the cylindrical battery 100. Furthermore, the larger radius of the first part 31 increases the contact area with the electrode assembly 20, which can reduce the current transmission resistance between the current collector 30 and the electrode assembly 20. Lower internal resistance means less energy loss during charging and discharging, thereby increasing the energy density of the cylindrical battery 100.

[0065] In some embodiments, referring to FIG7, along the axial direction X of the cylindrical battery 100, the projection of the outer ring of the second portion 32 at least partially overlaps with the projection of the outer ring of the first portion 31. When the electrode assembly 20 and the housing 10 are relatively displaced, the partial overlap of the projections of the outer ring of the first portion 31 and the outer ring of the second portion 32 increases the contact area between the first portion 31 and the second portion 32, forming mutual support, reducing stress concentration, improving the overall deformation resistance of the current collector 30, and thus reducing the risk of tearing of the current collector 30.

[0066] For example, after the first part 31 and the second part 32 are folded, the end of the first part 31 away from the connecting part 33 and the end of the second part 32 away from the connecting part 33 will preferentially contact each other. After folding, these two ends can be overlapped, which can better distribute stress. This allows the second part 32 to adopt other irregular structures, and the first part 31 can also adopt a similar irregular structure, which can easily adapt to electrode assemblies 20 with different structures.

[0067] To reduce the risk of tearing at the connection portion 33, in embodiments of this application, the cylindrical battery 100 further includes a buffer member 40. Referring to Figure 8, the buffer member 40 is disposed at the connection portion 33, and the buffer member 40 faces the first portion 31 and the second portion 32. For example, before the collector plate 30 is bent, the buffer member 40 can be disposed at the connection portion 33 between the first portion 31 and the second portion 32. By bending the first portion 31 and the second portion 32, the buffer member 40 can be clamped in the connection portion 33.

[0068] By providing a buffer 40 at the connection portion 33, when the cylindrical battery 100 is subjected to external impact or vibration, the buffer 40 can absorb part of the impact force, reducing the stress transmitted to the connection portion 33 and helping to reduce the risk of breakage due to stress concentration. Furthermore, the buffer 40 allows for a more even distribution of stress at the connection portion 33, effectively reducing localized stress concentration and improving the overall strength and reliability of the current collector 30. Simultaneously, the buffer 40 can fill part of the gap between the first part 31 and the second part 32 of the current collector 30, effectively reducing repeated stress on the connection portion 33, improving its fatigue resistance, extending its service life, and reducing the risk of failure of the cylindrical battery 100. Additionally, when the first part 31 and the second part 32 are folded, the buffer 40 can also withstand some stress, reducing the likelihood of cracks or tears appearing in the connection portion 33 during folding.

[0069] In some embodiments, the buffer 40 is partially located between the first portion 31 and the second portion 32, allowing the buffer 40 to fill a portion of the gap between the first portion 31 and the second portion 32, reducing excessive bending between the first portion 31 and the second portion 32 that could lead to tearing of the connection portion 33. Furthermore, the buffer 40 provides additional protection for the manifold 30, reducing the impact force transmitted to the manifold 30 and the electrode assembly 20, thus reducing not only tearing of the manifold 30 but also loosening of the electrode assembly 20 due to impact.

[0070] Regarding the shape of the buffer member 40, after bending, the connecting portion 33 will enclose a gap space. Along the direction from the connecting portion 33 to the first portion 31 and the second portion 32, the height of the gap space (the height along the axial direction X of the cylindrical battery 100) gradually decreases. The buffer member 40 can be configured in a shape similar to the gap space, for example, configured in a shape with a gradually decreasing height, so that it can fit fully with the connecting portion 33, thereby effectively absorbing impact force and dispersing stress, reducing the risk of tearing of the connecting portion 33.

[0071] Regarding the material of the buffer 40, in some embodiments, the buffer 40 is at least one of rubber, silicone, hot melt adhesive, or polypropylene.

[0072] Rubber has high elasticity and can deform when subjected to external force, absorbing impact force and thus reducing the stress transmitted to the connection part 33. In addition, rubber has a certain degree of wear resistance and can maintain its cushioning performance during long-term use.

[0073] The silicone material is soft and can better conform to the surface of the manifold 30, providing a uniform cushioning effect. It can adapt to manifolds 30 of different shapes and sizes, ensuring good contact and cushioning.

[0074] Hot melt adhesive can quickly melt and bond the connecting part 33 of the manifold 30 after heating, forming a strong connection. At the same time, hot melt adhesive can also play a buffering role, reducing stress at the connection. Furthermore, by controlling the amount of hot melt adhesive and the heating temperature, the thickness and hardness of the buffer 40 can be adjusted to meet different buffering requirements.

[0075] Polypropylene has high strength and toughness, and can withstand certain mechanical stress. It can provide some support at the connection part 33, reducing the deformation or damage of the connection part 33 due to external force. In addition, polypropylene has good chemical stability and is not easily corroded by the chemical substances inside the cylindrical battery 100, which can extend the service life of the buffer 40.

[0076] In some embodiments, referring to FIG9, a plurality of first protrusions 311 are provided on the surface of the first portion 31 facing the second portion 32. When the first portion 31 and the second portion 32 are folded, the first protrusions 311 can be supported between the first portion 31 and the second portion 32, forming a transport space for electrolyte, which facilitates the electrode liquid to wet the electrode assembly 20. The first protrusions 311 can also reduce the tearing of the connecting portion 33 caused by excessive bending of the first portion 31 and the second portion 32, thereby improving the overall strength of the first portion 31.

[0077] In some other embodiments, a plurality of second protrusions 321 may also be provided on the surface of the second part 32 facing the first part 31. The second protrusions 321 support the first part 31 and the second part 32, which can improve the strength of the second part 32 and reduce the tearing of the connection part 33 caused by excessive bending of the first part 31 and the second part 32.

[0078] Meanwhile, when the first part 31 and the second part 32 are not folded, the collector plate 30 is in the shape of a sheet, and multiple collector plates 30 can be stacked. The first protrusion 311 and / or the second protrusion 321 can form a gap space between two adjacent collector plates 30, which facilitates the removal and placement of the collector plates 30.

[0079] To reduce the problem of tearing of the connection portion 33, in the embodiments of this application, referring to Figures 10 and 11, the cylindrical battery 100 further includes a gasket 50, the first portion 31 and the second portion 32 are disposed in the inner ring of the gasket 50, and the gasket 50 is disposed between the electrode assembly 20 and the first wall portion 11.

[0080] The gasket 50 can absorb some of the impact force. When the cylindrical battery 100 is subjected to external impact, such as a drop or collision, the gasket 50 can act as a buffer, reducing the external force transmitted to the current collector 30, thereby reducing the risk of tearing of the current collector 30 due to instantaneous external force. Furthermore, the gasket 50 can distribute the stress concentrated at a certain point on the current collector 30 to a larger area. When the cylindrical battery 100 is subjected to external force, it can reduce the excessive local stress on the current collector 30, thus reducing the risk of tearing.

[0081] Furthermore, the gasket 50, supported between the electrode assembly 20 and the first wall 11 of the housing 10, restricts the relative displacement between the electrode assembly 20 and the bottom of the housing 10, thereby reducing deformation or tearing of the current collector 30 caused by such displacement. When the cylindrical battery 100 is subjected to external force or changes in internal pressure, the electrode assembly 20 and the housing 10 may deform to a certain extent. Without the restriction of the gasket 50, this deformation may be transmitted to the current collector 30, causing the current collector 30 to tear. For example, in a high-temperature environment, the material inside the cylindrical battery 100 may expand. The gasket 50 can reduce the squeezing deformation of the current collector 30 caused by excessive expansion of the electrode assembly 20.

[0082] Regarding the thickness of the gasket 50, the inventors of this application have found that if the thickness of the gasket 50 is too small, it may be difficult to effectively support the electrode assembly 20 and the first wall portion 11, resulting in poor absorption of impact force. On the other hand, if the thickness of the gasket 50 is too large, it occupies a large amount of space, causing a loss of energy density in the cylindrical battery 100.

[0083] In the embodiments of this application, referring to FIG12, along the axial direction X of the cylindrical battery 100, the thickness of the first portion 31 is T1, the thickness of the second portion 32 is T2, and the thickness of the gasket 50 is T, where 0.9(T1+T2)≤T≤1.1(T1+T2). This allows the gasket 50 to effectively support the electrode assembly 20 and the first wall portion 11, fully absorb impact force, reduce stress concentration, thereby reducing tearing of the current collector 30, and minimizing the impact on the energy density of the cylindrical battery 100.

[0084] Regarding the radius of the washer 50, in the embodiments of this application, the radius of the first part 31 is R1, the radius of the second part 32 is R2, the radius of the electrode assembly 20 is R3, the inner radius of the washer 50 is R4, and the outer radius of the washer 50 is R5, where R2≤R1≤R4<R5<R3. This facilitates a tight fit between the washer 50 and the electrode assembly 20 and the first wall portion 11, thereby reducing stress concentration and reducing tearing of the manifold 30. Similar to the radii of the first part 31 and the second part 32, the radii of the electrode assembly 20, the inner radius of the washer 50, and the outer radius of the washer 50 can be their own radii or the radius of the fitted circle they lie on.

[0085] In some embodiments, the material of the gasket 50 includes at least one of polypropylene (PP), polycarbonate (PC), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyimide (PI), or nylon (PA). These materials provide excellent cushioning, absorbing external impacts and reducing stress transmitted to the current collector 30. They also possess high strength, providing stable support for the current collector 30 and reducing its movement or deformation within the cylindrical battery 100. Furthermore, materials such as polypropylene, polyphenylene sulfide, and polyetheretherketone exhibit high corrosion resistance to electrolytes and other chemicals, reducing corrosion of the gasket 50 within the cylindrical battery 100 environment and maintaining its stable performance, thus providing long-term protection for the current collector 30. In addition, materials such as polycarbonate, polyphenylene sulfide, polyether ether ketone, and polyimide have good high temperature resistance and can maintain stable performance in the high temperature environment during the operation of the cylindrical battery 100, thereby reducing the softening or deformation of the gasket 50 due to high temperature and ensuring its support and protection of the current collector 30.

[0086] The inventors of this application have discovered that after the first part 31 and the second part 32 are folded, cracks may appear in the connecting part 33. When the cylindrical battery 100 is subjected to impacts such as collisions, the cracks may be aggravated, or even the connecting part 33 may tear. To reduce this problem, in the embodiments of this application, referring to Figure 12, the thickness of the first part 31 is T1, the thickness of the second part 32 is T2, and the thickness of the connecting part 33 is T3, where T3 < T1 and T3 < T2. By reducing the thickness of the connecting part 33, the connecting part 33 can better adapt to deformation during the folding process, facilitating the uniform transfer of stress from one part to another. Furthermore, reducing the thickness of the connecting part 33 can improve its flexibility, allowing it to better withstand deformation during bending and reducing the risk of tearing due to excessive rigidity.

[0087] The inventors of this application have discovered that if the thickness of the connecting portion 33 is too small, although it facilitates the folding of the first part 31 and the second part 32, the tear resistance is weakened, which may cause the connecting portion 33 to tear during impacts such as collisions to the cylindrical battery 100. On the other hand, if the thickness of the connecting portion 33 is too large, the connecting portion 33 becomes too rigid, making it difficult to fold the current collector 30. During the folding process, cracks may also appear in the connecting portion 33, which may increase in size or even cause the connecting portion 33 to tear during impacts such as collisions to the cylindrical battery 100.

[0088] To mitigate this problem, in the embodiments of this application, 60% ≤ T3 / T1 ≤ 80% can improve the flexibility of the connecting portion 33 while also giving it higher strength. This not only facilitates the folding of the first part 31 and the second part 32 but also reduces tearing of the connecting portion 33. Based on the same inventive concept, 60% ≤ T3 / T2 ≤ 80% can be selected, which can further improve the flexibility of the connecting portion 33 and give it higher strength. This not only facilitates the folding of the first part 31 and the second part 32 but also further reduces tearing of the connecting portion 33 and gives both the first part 31 and the second part 32 higher strength.

[0089] In some embodiments, referring to FIG13, the cylindrical battery 100 further includes a first adhesive layer 60, which is disposed on the surface of the connecting portion 33 facing away from the first portion 31 and the second portion 32. For example, after the first portion 31 and the second portion 32 are bent, the first adhesive layer 60 can be adhered to the connecting portion 33. The provision of the first adhesive layer 60 can improve the connection stability between the first portion 31 and the second portion 32, reduce the relative displacement between the first portion 31 and the second portion 32, and disperse some of the shear force on the connecting portion 33 to the first adhesive layer 60. The first adhesive layer 60 can resist tearing of the connecting portion 33, thereby improving the stability of the current collector 30.

[0090] Referring to Figure 14, the first adhesive layer 60 includes a substrate layer 61 and an adhesive layer 62.

[0091] The substrate layer 61 includes polyethylene terephthalate (PET) and / or polyimide (PI), etc. PET has good mechanical properties and chemical resistance, high strength, good toughness, and is not easily broken, which can improve the structural stability of the first adhesive layer 60, thereby reducing tearing of the manifold 30. Polyimide has high heat resistance, chemical resistance, and mechanical strength, allowing the first adhesive layer 60 to maintain good performance at high temperatures. Its high strength and chemical resistance can effectively protect the connection portion 33 of the manifold 30.

[0092] The adhesive layer 62 includes acrylic resin and / or epoxy resin, etc. Acrylic resin has good adhesion, weather resistance and chemical stability, which can improve the bonding strength between the first adhesive layer 60 and the joint 33. Epoxy resin has high strength, high adhesion and good heat resistance and chemical corrosion resistance. After curing, it can form a strong adhesive layer, which can effectively resist the deformation of the joint 33, thereby reducing the tearing of the joint 33.

[0093] Regarding the material of the current collector 30, in the embodiments of this application, the material of the current collector 30 includes at least one of copper alloy, copper-nickel alloy, aluminum alloy, titanium alloy, stainless steel, or nickel-chromium alloy. Copper alloy and copper-nickel alloy have high conductivity, which can reduce the internal resistance of the cylindrical battery 100 and improve the charging and discharging efficiency of the cylindrical battery 100. They also have high strength and corrosion resistance, which can extend the service life of the current collector 30. Aluminum alloy is lightweight and low in cost, which can reduce the overall weight of the cylindrical battery 100. Titanium alloy and stainless steel have good corrosion resistance and can adapt to the electrolyte environment inside the cylindrical battery 100, which is beneficial to extending the service life of the current collector 30. Nickel-chromium alloy also has good corrosion resistance, as well as high oxidation resistance and heat resistance. Under high temperature environment, the nickel-chromium alloy current collector 30 can maintain stable performance and will not affect the normal operation of the cylindrical battery 100 due to oxidation or deformation. All of the above materials have high mechanical strength and can withstand the internal pressure of the cylindrical battery 100 and the external impact force, which can reduce tearing of the current collector 30.

[0094] Secondly, this application also proposes an electronic device, including the cylindrical battery 100 as described in any embodiment of the first aspect above. The electronic device in this application is not particularly limited and can be any electronic device known in the prior art. For example, electronic devices include, but are not limited to, Bluetooth headsets, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0095] Experiment 1: Drop Test of Cylindrical Battery

[0096] Example A1:

[0097] Preparation of the positive electrode sheet:

[0098] The cathode material is lithium cobalt oxide, the cathode conductive agent is acetylene black, and the cathode binder is polyvinylidene fluoride (PVDF, with a weight-average molecular weight of 5×10⁻⁶). 5 The materials were mixed at a mass ratio of 94:3:3, and N-methylpyrrolidone (NMP) was added to prepare a positive electrode slurry with a solid content of 75 wt%. The mixture was then stirred uniformly under vacuum. A 10 μm thick aluminum foil was used as the positive electrode current collector. The positive electrode slurry was uniformly coated onto one surface of the current collector, leaving an uncoated area on the foil. The coating weight was 0.135 mg / mm². 2The cathode material layer is dried at 110°C to obtain a cathode electrode sheet with a single-sided coating. Then, the above steps are repeated on the other surface of the cathode current collector to obtain a cathode electrode sheet with a double-sided coating.

[0099] Preparation of negative electrode sheet:

[0100] Artificial graphite (negative electrode material), conductive carbon black (Super P) (conductive agent), and styrene-butadiene rubber (SBR) (binder) were mixed in a weight ratio of 97.5:1:1.5. Deionized water was then added to prepare a negative electrode slurry with a solid content of 50 wt%, and the mixture was stirred thoroughly. A 6 μm thick copper foil was selected as the negative electrode current collector. The negative electrode slurry was uniformly coated onto one surface of the copper foil, with a coating weight of 0.075 mg / mm². 2 The electrode is dried at 120℃ to obtain a single-sided negative electrode sheet. After completing the above steps, the single-sided coating of the negative electrode sheet is finished. Then, the above steps are repeated on the other surface of the negative electrode sheet to obtain a negative electrode sheet with a double-sided coating of the negative electrode material layer.

[0101] Preparation of the separating membrane:

[0102] A porous polyethylene (PE) film with a thickness of 5 μm was used as the separator.

[0103] Electrolyte preparation:

[0104] In a dry argon atmosphere, ethylene carbonate, methyl ethyl carbonate and diethyl carbonate are mixed in a mass ratio of 30:50:20 to obtain an organic solvent. Then, lithium hexafluorophosphate is added to the organic solvent to dissolve and mix evenly to obtain an electrolyte with a lithium salt concentration of 1.15 mol / L.

[0105] Fabrication of cylindrical solar cells:

[0106] A 200μm thick manifold is selected. The manifold includes a first part, a second part, and a connecting part between the first part and the second part. The radius of the first part is 10mm, the radius of the second part is 9mm, and the width of the connecting part is 2mm less than that of the shorter part. The first part and the second part are folded together.

[0107] Polycarbonate gaskets are selected, with the inner radius of the gasket matching the maximum radius of the outer ring of the manifold. The gasket should be placed on the outer ring of the manifold. The gasket thickness T is (T1+T2)=400μm, with the first part T1 being 200μm and the second part T2 being 200μm.

[0108] A 3mm wide aluminum sheet is used as the positive electrode tab, which is welded to the positive electrode plate. A 3mm wide nickel sheet is used as the negative electrode tab, which is welded to the negative electrode plate. The prepared separator, positive electrode plate, separator, and negative electrode plate are stacked in sequence and wound to form an electrode assembly. The electrode assembly is then hot-pressed (pressure 5MPa, temperature 65℃, holding time 10s). The first part of the current collector is welded to the negative electrode tab of the electrode assembly, and the second part of the current collector is welded to the bottom wall (first wall) of the cylindrical steel shell using laser penetration welding to lead out the negative electrode. The first part of another current collector is welded to the positive electrode tab of the electrode assembly, and the second part of another current collector is welded to the electrode post on the cover plate (second wall) to lead out the positive electrode. Electrolyte is injected, and after vacuum sealing, settling, hot-pressing formation, and shaping processes, a lithium-ion cylindrical battery is obtained.

[0109] Unlike Example 1, the relevant parameters in Examples A2 to A10 and Comparative Examples A1 to A5 are shown in Table 1 below. In Examples A6 to A10, rubber is used as a buffer. The buffer is placed in the connecting part and clamped between the first part and the second part. The length of the buffer is the same as the length of the connecting part, and the width extends to 1 mm between the first part and the second part.

[0110] Drop test method: The cylindrical battery was placed in a 25℃ environment and left to stand for 30 minutes. Then, the cylindrical battery was placed in a fixture and dropped from a height of 1.8m on a marble floor, once along both end faces and once along the cylindrical surface, for a total of 20 drops. The drop order was (end faces first, then cylindrical surfaces). After the drops, the battery was left to stand at room temperature for 24 hours. The battery was then disassembled, and the appearance of the current collector was inspected and photographed. The drop test pass criterion was: no cracks or tears appeared at the current collector connection. Of the 20 cylindrical batteries tested, X batteries failed the test, resulting in a failure rate of X / 20.

[0111] Table 1

[0112] According to Table 1 above, and in conjunction with Examples A1 to A5 and Comparative Examples A1 to A5, it can be seen that the use of gaskets can effectively reduce the risk of drop failure of cylindrical batteries. This is because gaskets can absorb some of the impact force. When a cylindrical battery is subjected to external impact, such as a drop or collision, the gasket can act as a buffer, reducing the external force transmitted to the current collector, thereby reducing the risk of tearing of the current collector due to instantaneous external force. Furthermore, the gasket can distribute the stress concentrated at a certain point on the current collector to a larger area. When the cylindrical battery is subjected to external force, it can reduce the excessive local stress on the current collector, thereby reducing the risk of tearing. In addition, the gasket, supported between the electrode assembly and the first wall of the housing, can limit the relative displacement between the electrode assembly and the bottom of the housing, thereby reducing the deformation or tearing of the current collector caused by such displacement.

[0113] In Examples A6 to A10, the drop failure rate is further reduced. This is because by providing a buffer at the connection, the buffer absorbs part of the impact force, reducing the stress transmitted to the connection and helping to reduce the risk of breakage due to stress concentration. Furthermore, the buffer allows for a more even distribution of stress at the connection, effectively reducing localized stress concentration and improving the overall strength and reliability of the collector plate. Simultaneously, the buffer fills part of the gap between the first and second parts of the collector plate, effectively reducing repeated stress on the connection, improving its fatigue resistance, and thus reducing the risk of tearing of the collector plate.

[0114] Taking Example A3 above as an example, the thickness T1 of the first part in Example B1 is 200 μm, and the thickness T2 of the second part is 200 μm. The gasket thickness is 280 μm. The relevant parameters in Examples B1 to B6 are shown in Table 2 below. Example B4 is the same as Example A3 above.

[0115] Table 2

[0116] According to Table 2 above, and in conjunction with Examples B1 to B6, the drop failure rate in Examples B3 to B6 is lower than that in Examples B1 and B2. This is because the thickness of the gasket is T, where 0.9(T1+T2)≤T≤1.1(T1+T2). This allows the gasket to effectively support the electrode assembly and the first wall, fully absorb the impact force, reduce stress concentration, and thus reduce tearing of the current collector. In Example B6, the gasket thickness is too large, resulting in a loss of energy density in the cylindrical battery. Therefore, in the embodiments of this application, 0.9(T1+T2)≤T≤1.1(T1+T2) can be selected to reduce the impact on energy density.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cylindrical battery, comprising a housing, an electrode assembly, and a current collector, wherein the housing includes a first wall, the electrode assembly is disposed within the housing, and the current collector is disposed between the electrode assembly and the first wall, characterized in that, The collector plate includes a first part, a second part, and a connecting part; The connecting part is connected between the first part and the second part, the second part is folded and disposed with respect to the first part, the first part is connected to the electrode assembly, and the second part is connected to the first wall part; The cylindrical battery also includes a gasket, with the first portion and the second portion disposed on the inner ring of the gasket, and the gasket disposed between the electrode assembly and the first wall portion.

2. The cylindrical battery according to claim 1, characterized in that, Along the axial direction of the cylindrical battery, the thickness of the first portion is T1, and the thickness of the second portion is T2. The thickness of the washer is T, where 0.9(T1+T2)≤T≤1.1(T1+T2).

3. The cylindrical battery according to claim 1 or 2, characterized in that, The radius of the first part is R1, the radius of the second part is R2, the radius of the electrode assembly is R3, the inner radius of the washer is R4, and the outer radius of the washer is R5, where R2≤R1≤R4<R5<R3.

4. The cylindrical battery according to any one of claims 1 to 3, characterized in that, The gasket is made of at least one of polypropylene, polycarbonate, polyphenylene sulfide, polyetheretherketone, polyimide, or nylon.

5. The cylindrical battery according to any one of claims 1 to 4, characterized in that, The cylindrical battery also includes a buffer member disposed on the connecting portion and facing the first portion and the second portion.

6. The cylindrical battery according to claim 5, characterized in that, The buffer portion is located between the first portion and the second portion.

7. The cylindrical battery according to claim 5 or 6, characterized in that, The cushioning element comprises at least one of rubber, silicone, hot melt adhesive, or polypropylene.

8. The cylindrical battery according to any one of claims 1 to 7, characterized in that, The surface of the first part facing the second part is provided with a plurality of first protrusions, and / or the surface of the second part facing the first part is provided with a plurality of second protrusions.

9. The cylindrical battery according to any one of claims 1 to 8, characterized in that, The thickness of the first part is T1, the thickness of the second part is T2, and the thickness of the connecting part is T3, where T3 < T1 and T3 < T2.

10. The cylindrical battery according to claim 9, characterized in that, 60% ≤ T3 / T1 ≤ 80%, 60% ≤ T3 / T2 ≤ 80%.

11. The cylindrical battery according to any one of claims 1 to 10, characterized in that, Along the axial direction of the cylindrical battery, the projection of the outer ring of the second portion at least partially overlaps with the projection of the outer ring of the first portion.

12. The cylindrical battery according to any one of claims 1 to 11, characterized in that, The material of the manifold includes at least one of copper alloy, copper-nickel alloy, aluminum alloy, titanium alloy, stainless steel, or nickel-chromium alloy.

13. The cylindrical battery according to any one of claims 1 to 12, characterized in that, The first part is provided with a first through hole, and the second part is provided with a second through hole; Along the axial direction of the cylindrical battery, the second through hole at least partially overlaps with the first through hole.

14. The cylindrical battery according to claim 13, characterized in that, The electrode assembly has a central hole along the axial direction of the cylindrical battery, and the second through hole, the first through hole, and the central hole at least partially overlap.

15. An electronic device, characterized in that, Including the cylindrical battery as described in any one of claims 1 to 14.

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