Cylindrical battery, battery module, and electric device

Abstract

This application discloses a cylindrical battery, a battery module, and an electrical device. The cylindrical battery includes a housing, an electrode assembly, an end cap assembly, and an insulating member. The housing includes a bottom wall and a side wall. The side wall includes a side wall body and a first protrusion. The side wall body is connected to the bottom wall, and the first protrusion protrudes from the inner surface of the side wall body. The electrode assembly is housed within the housing. The bottom wall and the end cap assembly are arranged axially along the cylindrical battery, and the end cap assembly is insulated from the side wall. Along the axial direction, at least a portion of the first protrusion is located between the electrode assembly and the end cap assembly. The insulating member includes a first insulating portion and a second insulating portion, the thickness of the first insulating portion being greater than the thickness of the second insulating portion. In the radial direction of the cylindrical battery, at least a portion of the first insulating portion is located inside the first protrusion. Along the axial direction, at least a portion of the first insulating portion is clamped between the electrode assembly and the end cap assembly, and at least a portion of the second insulating portion is clamped between the electrode assembly and the first protrusion.

Description

Technical Field

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

[0002] With the rapid development of the battery industry, the application of batteries in electric vehicles, electric bicycles, power tools, and other fields has become a trend. Cylindrical batteries are favored due to their advantages such as good packability and high stability, and are gradually being used in various complex scenarios.

[0003] Since cylindrical batteries need to be used in multiple scenarios and under multiple operating conditions, improving the safety performance of cylindrical batteries has always been a research direction in the industry. Summary of the Invention

[0004] This application provides a cylindrical battery, a battery module, and an electrical device, which helps to reduce the movement of electrode components and improve the shock resistance of the cylindrical battery.

[0005] In a first aspect, this application provides a cylindrical battery including an electrode assembly, a housing, an end cap assembly, and an insulating member. The housing includes a bottom wall and a side wall; the side wall includes a side wall body and a first protrusion, the side wall body being connected to the bottom wall, and the first protrusion protruding from the inner surface of the side wall body. The electrode assembly is housed within the housing. The bottom wall and the end cap assembly are arranged axially along the cylindrical battery, and the end cap assembly is insulated from the side wall. Axially, at least a portion of the first protrusion is located between the electrode assembly and the end cap assembly. The insulating member includes a first insulating portion and a second insulating portion, the thickness of the first insulating portion being greater than the thickness of the second insulating portion. Radially in the cylindrical battery, at least a portion of the first insulating portion is located inside the first protrusion. Axially, at least a portion of the first insulating portion is held between the electrode assembly and the end cap assembly, and at least a portion of the second insulating portion is held between the electrode assembly and the first protrusion.

[0006] When a cylindrical battery is subjected to external forces, the end cap assembly can press against the electrode assembly through the first insulating portion, reducing the axial movement of the electrode assembly; similarly, the first protrusion can press against the electrode assembly through the second insulating portion, reducing the axial movement of the electrode assembly. This helps reduce the risk of electrode assembly damage and short circuit, improving the cylindrical battery's shock resistance and drop resistance. By providing a first insulating portion with a larger thickness, the distance between the end cap assembly and the electrode assembly can be increased, providing space for other components of the cylindrical battery. By providing first and second insulating portions with different thicknesses, a portion of the first insulating portion can be positioned inside the first protrusion, reducing the risk of short circuits due to the first protrusion contacting other conductive components.

[0007] In one or more of the above optional embodiments, the electrode assembly has a first end face at one end facing the end cap assembly. The first end face includes a first region and a second region. The axial projection of the first region overlaps with the axial projection of the first insulating portion. The axial projection of the second region lies within the axial projection of the first protrusion, and the axial projection of the second region also lies within the axial projection of the second insulating portion. Axially, at least a portion of the first region extends beyond the second region, which helps to reduce the axial movement of the electrode assembly when the cylindrical battery is subjected to external forces, thereby improving the shock resistance and drop resistance of the cylindrical battery.

[0008] In one or more of the above optional embodiments, the first region extends beyond the second region along the axial direction, which can further reduce the axial displacement of the electrode assembly when the cylindrical battery is subjected to external forces, thereby improving the shock resistance and drop resistance of the cylindrical battery.

[0009] In one or more of the above optional embodiments, the difference S1 between the average height of the first region and the average height of the second region along the axial direction is 0.1 mm to 0.5 mm.

[0010] Setting S1 to greater than or equal to 0.1 mm allows the second region to be compressed further, increasing the pressure on it and reducing the risk of the electrode assembly shifting due to insufficient local pressure. Since the second region is close to the outer periphery of the electrode assembly, the first protrusion is less prone to deformation. The greater pressure exerted by the first protrusion on the second region improves the stability of the electrode assembly and enhances the shock and drop resistance of the cylindrical battery. Setting S1 to less than or equal to 0.5 mm limits the maximum difference in force across different areas of the first end face, reducing the risk of the electrode assembly being damaged by excessive local pressure.

[0011] In one or more of the above optional embodiments, the cylindrical battery further includes a current collector disposed between the end cap assembly and the electrode assembly. The current collector includes a first connecting portion, a second connecting portion, and a first bending portion. The first connecting portion is disposed on a first end face and connected to the electrode assembly. A portion of the first connecting portion is disposed between a first insulating portion and the first end face. The second connecting portion is located between the end cap assembly and the first connecting portion and is connected to the end cap assembly. The first bending portion connects the first connecting portion and the second connecting portion. The first insulating portion surrounds the second connecting portion.

[0012] The bent current collector design simplifies the assembly of cylindrical batteries. The second connection portion can be positioned within the space enclosed by the first insulating portion, thereby improving space utilization. The first insulating portion can separate the first protrusion from the second connection portion to reduce the risk of short circuits.

[0013] In one or more of the above optional embodiments, the first end face includes a third region, the axial projection of which overlaps with the axial projection of the second connecting portion. Axially, at least a portion of the third region extends beyond the first region.

[0014] During assembly, the end cap assembly applies pressure to the first end face via the second connecting portion, the first bending portion, and the first connecting portion. The area of ​​the first end face pressed by the first connecting portion moves towards the bottom wall; the distance the first area moves towards the bottom wall is greater than the distance the third area moves towards the bottom wall. After assembly, at least a portion of the third area extends beyond the first area axially. After assembly, the pressure on the third area is smaller, and correspondingly, the reaction force exerted by the third area on the collector plate is also smaller. The second connecting portion is connected to the middle of the end cap assembly. By reducing the reaction force of the third area on the collector plate, this embodiment can reduce the risk of damage to the collector plate and reduce the force transmitted to the end cap assembly, thus reducing the deformation of the end cap assembly.

[0015] In one or more of the above optional embodiments, the third region extends entirely beyond the second region along the axial direction. The difference between the average height of the third region along the axial direction and the average height of the second region along the axial direction is greater than the thickness of the first connecting portion.

[0016] Compared to the third region, the second region is at least as thin as the first connection portion, which increases the pressure exerted on it. The second region is located near the outer periphery of the electrode assembly, and applying greater pressure to it enhances the stability of the electrode assembly and improves the shock and drop resistance of the cylindrical battery.

[0017] In one or more of the above optional embodiments, the first insulating portion is annular, and the second insulating portion is annular and surrounds the outside of the first insulating portion.

[0018] By setting an annular first insulating part and an annular second insulating part, it is beneficial to increase the pressure-bearing area of ​​the electrode assembly, improve the stability of the electrode assembly, and enhance the shock resistance and drop resistance of the cylindrical battery.

[0019] In one or more of the above optional embodiments, the first insulating part includes an inner annular surface and an outer annular surface that are radially opposite each other. The first insulating part is provided with a channel, the two ends of which extend to the inner annular surface and the outer annular surface, respectively. A first space is formed between the second insulating part and the end cap assembly. The first insulating part encloses the second space, and the channel connects the first space and the second space.

[0020] During the production and use of cylindrical batteries, the gas generated by the electrode assembly can flow into the first space through the second space and the channel. By setting up the channel, the first space can be used to contain the gas, thereby reducing the internal pressure of the cylindrical battery, improving the cycle performance of the cylindrical battery, and reducing the risk of cylindrical battery failure.

[0021] In one or more of the above alternative embodiments, the channel includes a recess that is recessed from the first insulating portion toward the surface of the end cap assembly.

[0022] The recess is easy to form, and using it to guide gas flow helps simplify the structure and forming process of the insulating component. The upper side of the recess is the end cap assembly, which has high strength. When the end cap assembly and the first insulating part are pressed against each other, the end cap assembly is not easy to fill into the recess. Using the recess to form a channel can reduce the risk of the channel being filled or blocked.

[0023] In one or more of the above optional embodiments, the depth of the recess along the axial direction is h1. The height by which the first insulating portion protrudes from the second insulating portion along the axial direction is h2. 0.1 ≤ h1 / h2 ≤ 1.

[0024] In this embodiment, setting h1 / h2 to be greater than or equal to 0.1 increases the cross-sectional area of ​​the recess, improves air conduction efficiency, and reduces the risk of the recess being sealed or failing. Setting h1 / h2 to be less than or equal to 1 reduces the impact of the recess on the strength of the first insulating part.

[0025] In one or more of the above optional embodiments, there are multiple channels, which are spaced apart circumferentially along the first insulating portion. By providing multiple channels, the gas conduction efficiency can be improved and the risk of channel failure can be reduced.

[0026] In one or more of the above optional embodiments, the thickness of the first insulating portion is H1, and the thickness of the second insulating portion is H2. 1.1≤H1 / H2≤5.

[0027] In this embodiment, H1 / H2 is set to be greater than or equal to 1.1, so that the second insulating portion has a smaller thickness or the first insulating portion has a larger thickness. The first protrusion presses against the electrode assembly through the second insulating portion, and the electrode assembly deforms under pressure; the smaller thickness of the second insulating portion can accommodate the deformation of the electrode assembly, improving the stability of the electrode assembly. The larger thickness of the first insulating portion can increase the distance between the end cap assembly and the electrode assembly, providing space for other components of the cylindrical battery. In this embodiment, H1 / H2 is set to be less than or equal to 5, so as to reduce the impact of the insulating component on the energy density of the cylindrical battery.

[0028] In one or more of the above optional embodiments, a gap is provided between the first insulating portion and the first protrusion in the radial direction. By providing the gap, the risk of radial compression of the first insulating portion during the forming process of the first protrusion can be reduced, and radial misalignment of the insulating component can be minimized. The gap can also accommodate gas, thereby reducing the internal pressure of the cylindrical battery.

[0029] In one or more of the above optional embodiments, the diameter of the inner cavity enclosed by the sidewall body is D1. The second insulating part is circular, and the outer diameter of the second insulating part is D2. In the radial direction, the height of the first protrusion protruding from the sidewall body is h3. 0 < D1 - D2 < h3.

[0030] In this embodiment, D1-D2 is set to be greater than 0 to reduce friction between the insulating component and the sidewall during the installation of the insulating component into the housing, thereby reducing installation difficulty. In this embodiment, D1-D2 is set to be less than h3, which allows the first protrusion to press against the outer periphery of the second insulating component when the second insulating part and the sidewall body are not coaxial due to assembly errors, thus improving the stability of the insulating component and the electrode assembly.

[0031] In one or more of the above optional embodiments, the end cap assembly includes an end cap and a blast-proof sheet disposed on the end cap. A second protrusion is provided on the side of the end cap facing the electrode assembly. Along the axial direction, at least a portion of the first insulating portion is clamped between the electrode assembly and the second protrusion.

[0032] By providing the second protrusion, the axial dimensional requirements of the first insulating portion can be reduced. The second protrusion also increases the strength of the area of ​​the end cap near the first insulating portion, thereby reducing the axial movement of the electrode assembly and improving the shock and drop resistance of the cylindrical battery.

[0033] In one or more of the above optional embodiments, the diameter of the cylindrical battery is 30mm-70mm.

[0034] The cylindrical battery of this embodiment has a large diameter. Large-diameter cylindrical batteries have advantages such as high energy density and good structural stability. When the cylindrical battery is subjected to external force and vibration, both the end cap assembly and the first protrusion can press against the electrode assembly through insulating materials, reducing the axial movement of the large-diameter electrode assembly. By providing insulating materials, the shock resistance and drop resistance of the large-diameter cylindrical battery can be improved.

[0035] Secondly, embodiments of this application also provide a battery module, which includes a plurality of cylindrical batteries provided in any of the embodiments of the first aspect.

[0036] Thirdly, embodiments of this application also provide an electrical device that includes a plurality of cylindrical batteries provided in any of the embodiments of the first aspect. Attached Figure Description

[0037] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0038] Figure 1 This is a schematic diagram of the structure of a cylindrical battery provided in some embodiments of this application;

[0039] Figure 2 for Figure 1 A schematic diagram of the explosion of the cylindrical battery shown;

[0040] Figure 3 for Figure 1 A cross-sectional schematic diagram of the cylindrical battery shown;

[0041] Figure 4 for Figure 3 Enlarged illustration within the box;

[0042] Figure 5 for Figure 4 Enlarged view of the area within the circle;

[0043] Figure 6 for Figure 1 A partial cross-sectional view of the cylindrical battery shown.

[0044] Figure 7 A schematic diagram of the insulating component of a cylindrical battery provided in some embodiments of this application;

[0045] Figure 8 for Figure 7 A sectional view taken along the AA direction;

[0046] Figure 9 for Figure 8 Enlarged view of the area within the circle;

[0047] Figure 10 This is a schematic diagram of a battery module provided in some embodiments of this application;

[0048] Figure 11 This is a schematic diagram of an electrical device provided for some embodiments of this application.

[0049] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0050]

[0051] Detailed Implementation

[0052] 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.

[0053] The terms "first," "second," "third," etc., used in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. 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.

[0054] 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.

[0055] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-10°, the two directions can be considered parallel.

[0057] The cylindrical battery, battery module, and electrical device of this application are described below with reference to the accompanying drawings.

[0058] Reference Figures 1 to 9 This application provides a cylindrical battery 1000.

[0059] The cylindrical battery 1000 can be, but is not limited to, a lithium-ion battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery.

[0060] Cylindrical battery 1000 can be 21700 battery, 18650 battery, 46800 battery, 49480 battery or other models of cylindrical battery 1000.

[0061] In some embodiments, the cylindrical battery 1000 is a secondary battery. After discharge, the active materials in the secondary battery can be reactivated by charging, allowing it to continue to be used.

[0062] In some embodiments, the cylindrical battery 1000 includes a housing 2 and an electrode assembly 1 housed within the housing 2.

[0063] In some embodiments, the electrode assembly 1 includes a first electrode and a second electrode with opposite polarities. During the charging and discharging process of the cylindrical battery 1000, active ions (e.g., lithium ions) are inserted and extracted back and forth between the first electrode and the second electrode. One of the first electrode and the second electrode is a positive electrode, and the other is a negative electrode.

[0064] In some embodiments, the electrode assembly 1 includes a separator disposed between a first electrode and a second electrode, the separator insulating the first electrode and the second electrode. The separator can reduce the risk of short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0065] In some embodiments, the first electrode, the diaphragm, and the second electrode are wound together.

[0066] In some embodiments, the first electrode includes a first current collector and a first active material layer. The first current collector includes a first coated area coated with the first active material layer and a first uncoated foil area. The first coated area and the first uncoated foil area may be arranged along the axial direction Z of the cylindrical battery 1000.

[0067] In some embodiments, the first empty foil area is wound into multiple turns.

[0068] In some embodiments, the first electrode includes a first tab, which can be formed by flattening or smoothing a first empty foil area. Exemplarily, the first empty foil area can be pressed from the outside to the inside along the radial direction of the electrode assembly 1, and the end of the first empty foil area away from the first coating area is bent to form the first tab.

[0069] In other embodiments, the first tab can be formed by flattening the first empty foil area. Exemplarily, the first empty foil area is pressed axially in the electrode assembly 1 from the side of the first empty foil area away from the first coated area, and the end of the first empty foil area away from the first coated area is bent to form the first tab.

[0070] In some embodiments, the second electrode includes a second current collector and a second active material layer. The second current collector includes a second coated area coated with the second active material layer and a second uncoated foil area. The second coated area and the second uncoated foil area may be arranged along the axial Z-axis of the cylindrical battery 1000.

[0071] In some embodiments, the second empty foil area is wound into multiple turns.

[0072] In some embodiments, the second electrode includes a second tab, which can be formed by flattening or smoothing a second empty foil area. Exemplarily, the second empty foil area can be pressed from the outside to the inside along the radial direction of the electrode assembly 1, and the end of the second empty foil area away from the second coating area is bent to form the second tab.

[0073] In other embodiments, the second tab can be formed by flattening the second empty foil area. Exemplarily, the second empty foil area is pressed axially in the electrode assembly 1 from the side of the second empty foil area away from the second coating area, and the end of the second empty foil area away from the second coating area is bent to form the second tab.

[0074] In some embodiments, along the axial direction Z of the cylindrical battery 1000, the first tab and the second tab are located at both ends of the electrode assembly 1.

[0075] In some embodiments, the housing 2 has an opening at one end along the axial direction Z.

[0076] In some embodiments, the housing 2 includes a bottom wall 21 and a side wall 22, the side wall 22 being connected to the bottom wall 21 and surrounding the electrode assembly 1. An opening is formed at one end of the side wall 22 away from the bottom wall 21 along the axial direction Z.

[0077] The bottom wall 21 and the side wall 22 can be integrally formed. Alternatively, the bottom wall 21 and the side wall 22 can also be formed independently and connected by welding or other means.

[0078] In some embodiments, the cylindrical battery 1000 includes an end cap assembly 3, which is connected to the housing 2 and covers the opening of the housing 2. The end cap assembly 3 can close the opening of the housing 2, thereby forming a relatively closed receiving space between the housing 2 and the end cap assembly 3, which can accommodate components such as the electrode assembly 1 and the electrolyte.

[0079] In some embodiments, the bottom wall 21 and the end cap assembly 3 are arranged along the axial direction Z of the cylindrical battery 1000. The end cap assembly 3 and the bottom wall 21 are located on opposite sides of the electrode assembly 1.

[0080] In some embodiments, the end cap assembly 3 is insulated from the sidewall 22.

[0081] In some embodiments, the end cap assembly 3 includes an end cap 31, which is insulated from the sidewall 22.

[0082] In some embodiments, the materials of the housing 2 and the end cap 31 may be steel, aluminum, composite metal, or other conductive materials. The materials of the housing 2 and the end cap 31 may be the same or different.

[0083] In some embodiments, the first electrode tab is connected to the end cap 31, and the second electrode tab is connected to the bottom wall 21.

[0084] In some embodiments, the end cap assembly 3 includes an insulating structure 34 disposed between the end cap 31 and the sidewall 22. Exemplarily, the insulating structure 34 may be insulating rubber or ceramic.

[0085] In some embodiments, the cylindrical battery 1000 includes a current collector 5 disposed between the end cap assembly 3 and the electrode assembly 1, and the current collector 5 is connected to the end cap assembly 3 and the electrode assembly 1.

[0086] In some embodiments, the current collector 5 is connected to the first tab and the end cap 31. By providing the current collector 5, an electrical connection can be achieved between the end cap 31 and the electrode assembly 1, which is beneficial for improving the current carrying capacity and simplifying the assembly process of the cylindrical battery 1000.

[0087] In some embodiments, the collector plate 5 is welded to the first electrode tab.

[0088] In some embodiments, the end cap assembly 3 further includes an explosion-proof sheet 32 ​​disposed on the end cap 31.

[0089] When the internal pressure of the cylindrical battery 1000 exceeds the upper limit that the explosion-proof plate 32 can withstand, the internal pressure of the cylindrical battery 1000 can cause the explosion-proof plate 32 to flip and explode away from the electrode assembly 1, thereby achieving the purpose of power cut-off and pressure relief. This helps to reduce the risk of the cylindrical battery 1000 exploding due to excessive internal pressure and improves the safety performance of the cylindrical battery 1000.

[0090] In some embodiments, the explosion-proof sheet 32 ​​may be attached to the end cap 31 by welding, riveting, bonding or other suitable means.

[0091] In some embodiments, at least a portion of the explosion-proof plate 32 may be located between the end cap 31 and the electrode assembly 1.

[0092] In some embodiments, the explosion-proof plate 32 connects the manifold 5 and the end cap 31.

[0093] In some embodiments, a portion of the explosion-proof sheet 32 ​​is located between the end cap 31 and the electrode assembly 1, and another portion of the explosion-proof sheet 32 ​​is bent outwards from the end cap 31 away from the electrode assembly 1 to cover the edge of the end cap 31. Optionally, an insulating structure 34 is disposed between the explosion-proof sheet 32 ​​and the sidewall 22.

[0094] In some embodiments, the end cap assembly 3 includes a perforated plate 33 disposed between the manifold 5 and the explosion-proof sheet 32. The perforated plate 33 connects the manifold 5 and the explosion-proof sheet 32, enabling electrical connection between the manifold 5 and the explosion-proof sheet 32. The end cap 31 is electrically connected to the first tab in sequence via the explosion-proof sheet 32, the perforated plate 33, and the manifold 5.

[0095] In some embodiments, the perforated plate 33 may have an opening, which serves as a channel for gas flow. This allows gas inside the cylindrical battery 1000 to act on the explosion-proof sheet 32 ​​through the opening, enabling the explosion-proof sheet 32 ​​to flip over when the internal gas pressure of the cylindrical battery 1000 becomes too high, thereby disconnecting it from the perforated plate 33 and reducing safety risks. When the explosion-proof sheet 32 ​​flips over, the scored portion breaks, forming a channel through which gas inside the cylindrical battery 1000 is discharged to the outside, further reducing safety risks.

[0096] In some embodiments, the sidewall 22 includes a sidewall body 221 and a first protrusion 222, the sidewall body 221 being connected to the bottom wall 21, and the first protrusion 222 protruding from the inner surface of the sidewall body 221.

[0097] As an example, the first protrusion 222 and the bottom wall 21 are respectively connected to the two ends of the side wall body 221.

[0098] As an example, the first protrusion 222 extends around the circumference of the cylindrical battery 1000.

[0099] As an example, the first protrusion 222 can be a solid structure or a hollow structure.

[0100] In some embodiments, at least a portion of the first protrusion 222 is located between the electrode assembly 1 and the end cap assembly 3 in the axial direction Z. In some examples, a portion of the first protrusion 222 is disposed between the electrode assembly 1 and the end cap assembly 3 in the axial direction Z; in other examples, the entire first protrusion 222 is disposed between the electrode assembly 1 and the end cap assembly 3 in the axial direction Z.

[0101] In some embodiments, the sidewall 22 further includes a fixing portion 223, and the first protrusion 222 connects the fixing portion 223 and the sidewall body 221.

[0102] In some examples, the retaining portion 223 is disposed around the end cap 31. A portion of the retaining portion 223 is bent to the side of the end cap 31 away from the first protrusion 222. Along the axial direction Z, a portion of the end cap 31 is located between the first protrusion 222 and the retaining portion 223.

[0103] In some embodiments, a sidewall recess 224 is provided on the outer side of the sidewall 22, and the sidewall recess 224 corresponds to the position of the first protrusion 222.

[0104] In some embodiments, the cylindrical battery 1000 includes an insulating member 6. Along the axial direction Z, a portion of the insulating member 6 is clamped between the electrode assembly 1 and the first protrusion 222.

[0105] The insulating member 6 can separate the first protrusion 222 from the electrode assembly 1, thereby reducing the risk of short circuit caused by contact between the first protrusion 222 and the electrode assembly 1. When the cylindrical battery 1000 is subjected to external forces, the insulating member 6 can reduce the amplitude of the movement of the electrode assembly 1 in the axial Z direction, reduce the risk of damage to the electrode assembly 1, and improve the shock resistance and drop resistance of the cylindrical battery 1000.

[0106] In some embodiments, the insulating member 6 includes a first insulating portion 61 and a second insulating portion 62, wherein the thickness of the first insulating portion 61 is greater than the thickness of the second insulating portion 62.

[0107] In the radial direction of the cylindrical battery 1000, at least a portion of the first insulating portion 61 is located inside the first protrusion 222. Exemplarily, in a projection plane perpendicular to the axial direction Z, the orthographic projection of the first protrusion 222 surrounds the outer side of the orthographic projection of the first insulating portion 61.

[0108] Along the Z-axis, at least a portion of the first insulating portion 61 is held between the electrode assembly 1 and the end cap assembly 3, and at least a portion of the second insulating portion 62 is held between the electrode assembly 1 and the first protrusion 222.

[0109] The electrode assembly 1 and the end cap assembly 3 apply pressure to the first insulating portion 61 from both sides, so that at least a portion of the first insulating portion 61 is clamped between the electrode assembly 1 and the end cap assembly 3 along the axial direction Z.

[0110] The electrode assembly 1 can directly contact the first insulating part 61 and directly apply pressure to the first insulating part 61; alternatively, other components can be clamped between the electrode assembly 1 and the first insulating part 61, through which the electrode assembly 1 applies pressure to the first insulating part 61.

[0111] The end cap assembly 3 can directly contact the first insulating part 61 and directly apply pressure to the first insulating part 61; alternatively, other components can be clamped between the end cap assembly 3 and the first insulating part 61, through which the end cap assembly 3 applies pressure to the first insulating part 61.

[0112] The electrode assembly 1 and the first protrusion 222 apply pressure to the second insulating portion 62 from both sides, so that at least a portion of the second insulating portion 62 is clamped between the electrode assembly 1 and the first protrusion 222 along the axial direction Z.

[0113] The electrode assembly 1 can directly contact the second insulating part 62 and directly apply pressure to the second insulating part 62; alternatively, other components can be clamped between the electrode assembly 1 and the second insulating part 62, through which the electrode assembly 1 applies pressure to the second insulating part 62.

[0114] The first protrusion 222 can directly contact the second insulating part 62 and directly apply pressure to the second insulating part 62; alternatively, other components can also be clamped between the first protrusion 222 and the second insulating part 62, through which the first protrusion 222 applies pressure to the second insulating part 62.

[0115] The first insulating portion 61 can separate at least a portion of the end cap assembly 3 from the electrode assembly 1 to reduce the risk of a short circuit caused by direct contact between the end cap assembly 3 and the electrode assembly 1 (e.g., the end cap assembly 3 is connected to the first tab, and if the end cap assembly 3 contacts the second electrode, a short circuit risk will occur); the second insulating portion 62 can separate at least a portion of the first protrusion 222 from the electrode assembly 1 to reduce the risk of a short circuit caused by direct contact between the first protrusion 222 and the electrode assembly 1 (e.g., the bottom wall 21 is connected to the second tab, and if the first protrusion 222 contacts the first electrode, a short circuit risk will occur).

[0116] When the cylindrical battery 1000 is subjected to external forces, the end cap assembly 3 can press against the electrode assembly 1 through the first insulating portion 61, reducing the axial movement of the electrode assembly 1 in the Z direction. Similarly, the first protrusion 222 can press against the electrode assembly 1 through the second insulating portion 62, further reducing the axial movement of the electrode assembly 1 in the Z direction. This helps reduce the risk of damage to the electrode assembly 1 and the risk of short circuits, improving the shock resistance and drop resistance of the cylindrical battery 1000. By providing a first insulating portion 61 with a larger thickness, the distance between the end cap assembly 3 and the electrode assembly 1 can be increased, providing space for other components of the cylindrical battery 1000. By providing first insulating portions 61 and second insulating portions 62 with different thicknesses, a portion of the first insulating portion 61 can be arranged inside the first protrusion 222, reducing the risk of short circuits caused by the first protrusion 222 contacting other conductive components.

[0117] In some embodiments, after the electrode assembly 1 and the insulating member 6 are installed into the housing 2, the sidewall 22 can be rolled from the outside to form a sidewall recess 224 and an inwardly protruding first protrusion 222.

[0118] In some embodiments, the electrode assembly 1 has a first end face 11 at one end facing the end cap assembly 3.

[0119] As an example, the first end face 11 can be the side of the first electrode ear facing the end cap 31. The first end face 11 can be formed by a flattening or patting process.

[0120] In some embodiments, the end of the electrode assembly 1 facing the bottom wall 21 has a second end face (not shown).

[0121] As an example, the second end face can be the side of the second electrode ear facing the bottom wall 21. The second end face can be formed by a flattening or patting process.

[0122] In some embodiments, the projection of the first end face 11 along the axial direction Z can be an annular shape.

[0123] In some embodiments, the first end face 11 includes a first region 111, the projection of the first region 111 along the axial direction Z overlaps with the projection of the first insulating portion 61 along the axial direction Z.

[0124] As an example, the end cap assembly 3 can press against the first region 111 through the first insulating part 61.

[0125] In some embodiments, the first region 111 is annular.

[0126] In some embodiments, the first end face 11 includes a second region 112, the projection of the second region 112 along the axial direction Z is located within the projection of the first protrusion 222 along the axial direction Z, and the projection of the second region 112 along the axial direction Z is located within the projection of the second insulating portion 62 along the axial direction Z.

[0127] As an example, the first protrusion 222 can press against the second region 112 through the second insulating portion 62.

[0128] As an example, during the roll forming process of the first protrusion 222, the first protrusion 222 gradually presses against the second insulating portion 62 so that the second region 112 moves toward the bottom wall 21.

[0129] In some embodiments, the second region 112 is annular.

[0130] In some embodiments, at least a portion of the first region 111 extends beyond the second region 112 along the axial direction Z, which helps to reduce the amplitude of the electrode assembly 1 moving along the axial direction Z when the cylindrical battery 1000 is subjected to external forces, thereby improving the shock resistance and drop resistance of the cylindrical battery 1000.

[0131] In some embodiments, the cylindrical battery 1000 further includes an insulating tape 7, which is disposed around the first electrode tab.

[0132] In some embodiments, a portion of the insulating tape 7 is folded over to the first end face 11 and adhered to the first end face 11.

[0133] In some embodiments, along the axial direction Z, a portion of the insulating tape 7 is clamped between the first end face 11 and the second insulating portion 62.

[0134] In some embodiments, along the axial direction Z, the electrode assembly 1, the first insulating portion 61, and the end cap assembly 3 are interference-fitted, and the electrode assembly 1, the second insulating portion 62, and the first protrusion 222 are also interference-fitted. The interference fit improves the stability of the electrode assembly 1 and enhances the shock resistance and drop resistance of the cylindrical battery 1000.

[0135] In some embodiments, the interference fit of the electrode assembly 1, the second insulating portion 62, and the first protrusion 222 during assembly is greater than the interference fit of the electrode assembly 1, the first insulating portion 61, and the end cap assembly 3 during assembly.

[0136] During assembly, the area of ​​the first end face 11 that is pressed against by the insulating member 6 will move toward the bottom wall 21; due to the difference in the assembly interference, the distance that the second region 112 moves toward the bottom wall 21 will be greater than the distance that the first region 111 moves toward the bottom wall 21. After assembly, at least a portion of the first region 111 extends beyond the second region 112 along the axial direction Z.

[0137] After assembly, the pressure on the second region 112 is greater than that on the first region 111. The second region 112 is close to the outer periphery of the electrode assembly 1, and the first protrusion 222 is not easily deformed. The first protrusion 222 applies greater pressure to the second region 112, which can improve the stability of the electrode assembly 1 and enhance the shock resistance and drop resistance of the cylindrical battery 1000.

[0138] In some embodiments, along the axial direction Z, the first region 111 extends beyond the second region 112, which can further reduce the displacement of the electrode assembly 1 in the axial direction Z when the cylindrical battery 1000 is subjected to external forces, thereby improving the shock resistance and drop resistance of the cylindrical battery 1000.

[0139] In some embodiments, along the axial direction Z, the average height of the second region 112 is less than the average height of the first region 111.

[0140] In some embodiments, along the axial direction Z, the difference S1 between the average height of the first region 111 and the average height of the second region 112 is 0.1 mm to 0.5 mm.

[0141] As an example, S1 is 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm.

[0142] As an example, the average height of the first region 111 along the Z-axis and the average height of the second region 112 along the Z-axis can be tested as follows:

[0143] A cross-section of the cylindrical battery 1000 was observed using a CT scanner (Zeiss Xrad ia 620 Versa), which passes through the axis L of the cylindrical battery 1000.

[0144] Select a first region 111 and a second region 112 located on the same side of axis L. Divide the first region 111 into 10 equal segments along the radial direction to obtain 11 first test points. Divide the second region 112 into 10 equal segments along the radial direction to obtain 11 second test points.

[0145] The plane containing the bottom surface of the bottom wall 21 is taken as the reference plane;

[0146] Measure the distance between each first test point and the reference plane along the Z-axis, and take the average of the 11 measured distances. This average can be the average height of the first region 111 along the Z-axis.

[0147] Measure the distance between each second test point and the reference plane along the Z-axis, and take the average of the 11 measured distances. This average value can be the average height of the second region 112 along the Z-axis.

[0148] Setting S1 to greater than or equal to 0.1 mm allows the second region 112 to be compressed further, increasing the pressure on the second region 112 and reducing the risk of the electrode assembly 1 shifting due to insufficient local pressure. Since the second region 112 is close to the outer periphery of the electrode assembly 1, the first protrusion 222 is less prone to deformation. The first protrusion 222 applies greater pressure to the second region 112, improving the stability of the electrode assembly 1 and enhancing the shock and drop resistance of the cylindrical battery 1000. Setting S1 to less than or equal to 0.5 mm limits the maximum difference in force across different areas of the first end face 11, reducing the risk of the electrode assembly 1 being damaged due to excessive local pressure.

[0149] In some embodiments, the manifold 5 includes a first connecting portion 51, a second connecting portion 52, and a first bending portion 53. The first connecting portion 51 is disposed on the first end face 11 and connected to the electrode assembly 1. The second connecting portion 52 is located between the end cap assembly 3 and the first connecting portion 51 and is connected to the end cap assembly 3. The first bending portion 53 connects the first connecting portion 51 and the second connecting portion 52.

[0150] The folded design of the collector plate 5 helps simplify the assembly of the cylindrical battery 1000.

[0151] In some embodiments, the first connecting portion 51 is welded to the first electrode tab.

[0152] In some embodiments, the second connecting portion 52 is connected to the perforated plate 33. Optionally, the second connecting portion 52 is welded to the perforated plate 33.

[0153] In some embodiments, the collector plate 5 further includes a third connecting portion 54 and a second bending portion 55. The third connecting portion 54 is located between the second connecting portion 52 and the end cap assembly 3 and is connected to the end cap assembly 3. The second bending portion 55 connects the second connecting portion 52 and the third connecting portion 54.

[0154] In some embodiments, the third connecting portion 54 is connected to the perforated plate 33.

[0155] In some embodiments, the first bend 53 and the second bend 55 are respectively connected to the two ends of the second connecting portion 52.

[0156] In some embodiments, a portion of the first connecting portion 51 is disposed between the first insulating portion 61 and the first end face 11.

[0157] In some examples, the first insulating portion 61 presses against the first end face 11 entirely through the first connecting portion 51. In other examples, a portion of the first insulating portion 61 presses against the first end face 11 through the first connecting portion 51, while another portion of the first insulating portion 61 contacts and directly presses against the first end face 11.

[0158] The first insulating part 61 and the first end face 11 can clamp the first connecting part 51 from both sides, which helps to improve the stability of the first connecting part 51. When the cylindrical battery 1000 is subjected to external force, the relative movement between the first connecting part 51 and the electrode assembly 1 is reduced, thereby reducing the risk of connection failure between the first connecting part 51 and the electrode assembly 1.

[0159] In some embodiments, a portion of the first connecting portion 51 is disposed between the second insulating portion 62 and the first end face 11.

[0160] In some examples, the second insulating portion 62 presses against the first end face 11 entirely through the first connecting portion 51. In other examples, a portion of the second insulating portion 62 presses against the first end face 11 through the first connecting portion 51, while another portion of the second insulating portion 62 contacts and directly presses against the first end face 11.

[0161] The second insulating part 62 and the first end face 11 can clamp the first connecting part 51 from both sides, which helps to improve the stability of the first connecting part 51. When the cylindrical battery 1000 is subjected to external force, the relative movement between the first connecting part 51 and the electrode assembly 1 is reduced, thereby reducing the risk of connection failure between the first connecting part 51 and the electrode assembly 1.

[0162] In some embodiments, the first insulating portion 61 is disposed around the second connecting portion 52.

[0163] The second connecting portion 52 can be disposed within the space enclosed by the first insulating portion 61, thereby improving space utilization. The first insulating portion 61 can separate the first protrusion 222 from the second connecting portion 52 to reduce the risk of short circuit.

[0164] In some embodiments, the first end face 11 includes a third region 113, the projection of the third region 113 along the axial direction Z overlaps with the projection of the second connecting portion 52 along the axial direction Z. Along the axial direction Z, at least a portion of the third region 113 extends beyond the first region 111.

[0165] In some embodiments, the electrode assembly 1, the current collector 5, and the end cap assembly 3 are interference-fitted along the Z-axis. The interference fit can improve the stability of the electrode assembly 1 and enhance the shock resistance and drop resistance of the cylindrical battery 1000.

[0166] During assembly, the end cap assembly 3 applies pressure to the first end face 11 via the second connecting portion 52, the first bending portion 53, and the first connecting portion 51. The area of ​​the first end face 11 pressed by the first connecting portion 51 moves toward the bottom wall 21; the distance the first region 111 moves toward the bottom wall 21 is greater than the distance the third region 113 moves toward the bottom wall 21. After assembly, at least a portion of the third region 113 extends beyond the first region 111 along the axial direction Z.

[0167] After assembly, the pressure on the third region 113 is relatively small, and correspondingly, the reaction force exerted by the third region 113 on the collector plate 5 is also relatively small. The second connecting part 52 is connected to the middle of the end cap assembly 3. By reducing the reaction force of the third region 113 on the collector plate 5, this embodiment of the application can reduce the risk of damage to the collector plate 5, and can also reduce the force transmitted to the end cap assembly 3, thereby reducing the deformation of the end cap assembly 3.

[0168] In some embodiments, along the Z-axis, the third region 113 extends entirely beyond the second region 112.

[0169] In some embodiments, along the Z-axis, the third region 113 extends entirely beyond the first region 111.

[0170] In some embodiments, the difference S2 between the average height of the third region 113 along the axial direction Z and the average height of the second region 112 along the axial direction Z is greater than the thickness of the first connecting portion 51.

[0171] As an example, the average height of the third region 113 along the Z-axis can be tested as follows:

[0172] A cross-section of the cylindrical battery 1000 was observed using a CT scanner (Zeiss Xrad ia 620 Versa), which passes through the axis L of the cylindrical battery 1000.

[0173] Select a third region 113 located on the same side of axis L as the second region 112, and divide the third region 113 into 10 equal segments along the radial direction to obtain 11 third test points;

[0174] The plane containing the bottom surface of the bottom wall 21 is taken as the reference plane;

[0175] Measure the distance between each third test point and the reference plane along the Z-axis;

[0176] The average of the 11 measured distances is taken, and this average can be the average height of the third region 113 along the Z axis.

[0177] Compared to the third region 113, the second region 112 is compressed by at least the thickness of the first connecting portion 51, which increases the pressure on the second region 112. The second region 112 is close to the outer periphery of the electrode assembly 1. Applying greater pressure to the second region 112 can improve the stability of the electrode assembly 1 and enhance the shock resistance and drop resistance of the cylindrical battery 1000.

[0178] In some embodiments, the first insulating portion 61 is annular, and the second insulating portion 62 is annular and surrounds the outside of the first insulating portion 61.

[0179] By setting the annular first insulating part 61 and the annular second insulating part 62, it is beneficial to increase the pressure-bearing area of ​​the electrode assembly 1, improve the stability of the electrode assembly 1, and enhance the shock resistance and drop resistance of the cylindrical battery 1000.

[0180] In some embodiments, the first insulating portion 61 is arc-shaped, and the second insulating portion 62 is annular.

[0181] Reference Figure 5 and Figure 6 In some embodiments, the first insulating portion 61 includes an inner annular surface 611 and an outer annular surface 612 that are radially opposed. The first insulating portion 61 is provided with a channel 613, the two ends of which extend to the inner annular surface 611 and the outer annular surface 612, respectively. A first space C1 is formed between the second insulating portion 62 and the end cap assembly 3. The first insulating portion 61 encloses a second space C2, and the channel 613 connects the first space C1 and the second space C2. There may be one or more channels 613.

[0182] As an example, channel 613 may include at least one of a recess and a hole.

[0183] During the production and use of the cylindrical battery 1000, the gas generated by the electrode assembly 1 can flow into the first space C1 through the second space C2 and the channel 613. By setting the channel 613, the first space C1 can be used to contain the gas, thereby reducing the internal pressure of the cylindrical battery 1000, improving the cycle performance of the cylindrical battery 1000, and reducing the risk of failure of the cylindrical battery 1000.

[0184] In some embodiments, the electrode assembly 1 includes a central hole 12, a second space C2 located on one side of the central hole 12 along the axial direction Z, and the second space C2 communicates with the central hole 12.

[0185] In some embodiments, the channel 613 includes a recess 613a, which is recessed from the first insulating portion 61 toward the surface of the end cap assembly 3.

[0186] The recess 613a is easy to form, and using the recess 613a to guide gas flow helps to simplify the structure and forming process of the insulating part 6. The upper side of the recess 613a is the end cap assembly 3, and the end cap assembly 3 has high strength. When the end cap assembly 3 and the first insulating part 61 are pressed against each other, the end cap assembly 3 is not easy to fill into the recess 613a; using the recess 613a to form the channel 613 can reduce the risk of the channel 613 being filled or closed.

[0187] In some embodiments, the depth of the recess 613a in the axial direction Z is h1. The height by which the first insulating portion 61 protrudes from the second insulating portion 62 along the axial direction Z is h2. 0.1 ≤ h1 / h2 ≤ 1.

[0188] As an example, h1 / h2 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.

[0189] In this embodiment, setting h1 / h2 to be greater than or equal to 0.1 can increase the cross-sectional area of ​​the recess 613a, improve the air conduction efficiency, and reduce the risk of the recess 613a being sealed or failing. Setting h1 / h2 to be less than or equal to 1 reduces the impact of opening the recess 613a on the strength of the first insulating part 61.

[0190] Setting h1 / h2 to be greater than 1 would cause the second insulating portion 62 to block the recess 613a, further increasing the depth of the recess 613a, which would have a limited effect on improving the air conduction capacity. Therefore, in this application, h1 / h2 is set to be less than or equal to 1 in the embodiments.

[0191] In some embodiments, there are multiple channels 613, and the multiple channels 613 are arranged at circumferential intervals along the first insulating portion 61.

[0192] The multiple channels 613 may have the same shape or different shapes.

[0193] The depths of multiple channels 613 can be the same or different.

[0194] By setting up multiple channels 613, the gas conduction efficiency can be improved and the risk of channel 613 failure can be reduced.

[0195] In some embodiments, a plurality of channels 613 are arranged at equal angular intervals along the circumference of the first insulating portion 61.

[0196] In some embodiments, there are four channels 613.

[0197] In some embodiments, the thickness of the first insulating portion 61 is H1, and the thickness of the second insulating portion 62 is H2. 1.1≤H1 / H2≤5.

[0198] As an example, H1 / H2 can be 1.1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5 or 5.

[0199] In this embodiment, H1 / H2 is set to be greater than or equal to 1.1, so that the second insulating portion 62 has a smaller thickness or the first insulating portion 61 has a larger thickness. The first protrusion 222 presses against the electrode assembly 1 through the second insulating portion 62, and the electrode assembly 1 deforms under pressure; the smaller thickness of the second insulating portion 62 can adapt to the deformation of the electrode assembly 1, improving the stability of the electrode assembly 1. The larger thickness of the first insulating portion 61 can increase the distance between the end cap assembly 3 and the electrode assembly 1, providing space for other components of the cylindrical battery 1000.

[0200] In this embodiment, H1 / H2 is set to be less than or equal to 5 to reduce the impact of the insulating element 6 on the energy density of the cylindrical battery 1000.

[0201] In some embodiments, 1.5 ≤ H1 / H2 ≤ 4. Alternatively, 2 ≤ H1 / H2 ≤ 3.

[0202] In some embodiments, a gap G is provided between the first insulating portion 61 and the first protrusion 222 in the radial direction. By providing the gap G, the risk of radial compression of the first insulating portion 61 during the forming process of the first protrusion 222 can be reduced, thereby reducing the radial misalignment of the insulating member 6. The gap G can also contain gas, thereby reducing the internal pressure of the cylindrical battery 1000.

[0203] For example, the gap G forms at least a portion of the first space C1.

[0204] In some embodiments, the diameter of the inner cavity enclosed by the sidewall body 221 is D1. The second insulating portion 62 is circular, and the outer diameter of the second insulating portion 62 is D2. In the radial direction, the height of the first protrusion 222 protruding from the sidewall body 221 is h3. 0 < D1 - D2 < h3.

[0205] As an example, D1-D2 can be 0.1×h3, 0.3×h3, 0.5×h3, 0.7×h3 or 0.9×h3.

[0206] In this embodiment, D1-D2 is set to be greater than 0 to reduce friction between the insulating member 6 and the side wall 22 during the installation of the insulating member 6 into the housing 2, thereby reducing installation difficulty. In this embodiment, D1-D2 is set to be less than h3, which allows the first protrusion 222 to press against the outer periphery of the second insulating member 62 when the second insulating part 62 and the side wall body 221 are not coaxial due to assembly errors, thus improving the stability of the insulating member 6 and the electrode assembly 1.

[0207] In some embodiments, the end cap 31 has a second protrusion 311 on the side facing the electrode assembly 1. Along the axial direction Z, at least a portion of the first insulating portion 61 is sandwiched between the electrode assembly 1 and the second protrusion 311.

[0208] By providing the second protrusion 311, the dimensional requirements of the first insulating portion 61 along the axial direction Z can be reduced. Furthermore, by providing the second protrusion 311, the strength of the area of ​​the end cap 31 near the first insulating portion 61 can be increased, thereby reducing the amplitude of the electrode assembly 1's movement along the axial direction Z and improving the shock resistance and drop resistance of the cylindrical battery 1000.

[0209] In some embodiments, a portion of the explosion-proof sheet 32 ​​is held between the second protrusion 311 and the first insulating portion 61.

[0210] In some embodiments, the end cap 31 has an end cap recess 312 on the side away from the electrode assembly 1, and the end cap recess 312 corresponds to the position of the second protrusion 311.

[0211] In some embodiments, the diameter of the cylindrical battery 1000 is 30mm-70mm.

[0212] As an example, the diameter of the cylindrical battery 1000 is 30mm, 35mm, 40mm, 42mm, 44mm, 45mm, 46mm, 48mm, 50mm, 55mm, 60mm, 65mm or 70mm.

[0213] The cylindrical battery 1000 of this embodiment has a large diameter. The large-diameter cylindrical battery 1000 has advantages such as high energy density and good structural stability. When the cylindrical battery 1000 is subjected to external force and vibrates, both the end cap assembly 3 and the first protrusion 222 can press against the electrode assembly 1 through the insulating member 6, reducing the amplitude of the large-diameter electrode assembly 1's movement in the axial Z direction. By providing the insulating member 6, the shock resistance and drop resistance of the large-diameter cylindrical battery 1000 can be improved.

[0214] Reference Figure 10 This application also provides a battery module 3000, which includes a plurality of cylindrical batteries 1000 provided according to any embodiment of this application.

[0215] In some embodiments, the battery module 3000 further includes a plurality of busbars (not shown) that connect a plurality of cylindrical batteries 1000.

[0216] In some embodiments, the battery module 3000 further includes a housing 2000, in which the cylindrical battery 1000 is housed.

[0217] Reference Figure 11This application also provides an electrical device 4000, which includes a cylindrical battery 1000 or a battery module 3000 provided in any embodiment of this application.

[0218] The electrical device 4000 in this application embodiment can be a portable device, an electric toy, a drone, a power tool, an energy storage system, etc. Power tools include metal cutting power tools, cleaning tools, etc., such as electric drills, electric wrenches, vacuum cleaners, robotic vacuum cleaners, and electric bicycles. This application embodiment does not impose any special limitations on the above-mentioned electrical device.

[0219] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cylindrical battery, characterized in that, include: A housing includes a bottom wall and a side wall, the side wall including a side wall body and a first protrusion, the side wall body being connected to the bottom wall, and the first protrusion protruding from the inner surface of the side wall body; Electrode assembly, housed within the housing; An end cap assembly, wherein the bottom wall and the end cap assembly are arranged along the axial direction of the cylindrical battery, the end cap assembly is insulated from the side wall, and along the axial direction, at least a portion of the first protrusion is located between the electrode assembly and the end cap assembly; An insulating component includes a first insulating portion and a second insulating portion, the thickness of the first insulating portion being greater than the thickness of the second insulating portion, and at least a portion of the first insulating portion being located inside the first protrusion in the radial direction of the cylindrical battery; along the axial direction, at least a portion of the first insulating portion is clamped between the electrode assembly and the end cap assembly, and at least a portion of the second insulating portion is clamped between the electrode assembly and the first protrusion.

2. The cylindrical battery according to claim 1, characterized in that, The electrode assembly has a first end face at one end facing the end cap assembly. The first end face includes a first region and a second region. The projection of the first region along the axial direction overlaps with the projection of the first insulating portion along the axial direction. The projection of the second region along the axial direction is located within the projection of the first protrusion along the axial direction, and the projection of the second region along the axial direction is located within the projection of the second insulating portion along the axial direction. Along the axial direction, at least a portion of the first region extends beyond the second region.

3. The cylindrical battery according to claim 2, characterized in that, Along the axial direction, the first region extends entirely beyond the second region.

4. The cylindrical battery according to claim 3, characterized in that, Along the axial direction, the difference between the average height of the first region and the average height of the second region is 0.1 mm to 0.5 mm.

5. The cylindrical battery according to any one of claims 2-4, characterized in that, The cylindrical battery also includes a current collector, which is disposed between the end cap assembly and the electrode assembly; The current collector includes a first connecting part, a second connecting part, and a first bending part. The first connecting part is disposed on the first end face and connected to the electrode assembly. A portion of the first connecting part is disposed between the first insulating part and the first end face. The second connecting part is located between the end cap assembly and the first connecting part and is connected to the end cap assembly. The first bending part connects the first connecting part and the second connecting part. The first insulating portion is disposed around the second connecting portion; The first end face includes a third region, the projection of the third region along the axial direction overlaps with the projection of the second connecting portion along the axial direction; Along the axial direction, at least a portion of the third region extends beyond the first region.

6. The cylindrical battery according to claim 5, characterized in that, Along the axial direction, the third region extends entirely beyond the second region; The difference between the average height of the third region along the axial direction and the average height of the second region along the axial direction is greater than the thickness of the first connecting portion.

7. The cylindrical battery according to any one of claims 1-6, characterized in that, The first insulating part is annular, and the second insulating part is annular and surrounds the outside of the first insulating part.

8. The cylindrical battery according to claim 7, characterized in that, The first insulating portion includes an inner annular surface and an outer annular surface that are opposite each other along the radial direction. The first insulating portion is provided with a channel, the two ends of which extend to the inner annular surface and the outer annular surface, respectively. The second insulating portion and the end cap assembly form a first space. The first insulating portion encloses a second space. The channel connects the first space and the second space.

9. The cylindrical battery according to claim 8, characterized in that, The channel includes a recess that is recessed from the first insulating portion toward the surface of the end cap assembly.

10. The cylindrical battery according to claim 9, characterized in that, Along the axial direction, the depth of the recess is h1; Along the axial direction, the height by which the first insulating portion protrudes from the second insulating portion is h2; 0.1≤h1 / h2≤1.

11. The cylindrical battery according to any one of claims 8-10, characterized in that, The channel is multiple, and the multiple channels are arranged at intervals along the circumference of the first insulating part.

12. The cylindrical battery according to any one of claims 1-11, characterized in that, The thickness of the first insulating part is H1, and the thickness of the second insulating part is H2; 1.1≤H1 / H2≤5.

13. The cylindrical battery according to any one of claims 1-12, characterized in that, In the radial direction, a gap is provided between the first insulating portion and the first protrusion.

14. The cylindrical battery according to any one of claims 1-13, characterized in that, The diameter of the inner cavity enclosed by the main sidewall is D1; The second insulating part is circular, and the outer diameter of the second insulating part is D2; In the radial direction, the first protrusion protrudes from the sidewall body by a height of h3; 0 < D1 - D2 < h3.

15. The cylindrical battery according to any one of claims 1-14, characterized in that, The end cap assembly includes an end cap and an explosion-proof sheet disposed on the end cap; The end cap has a second protrusion on the side facing the electrode assembly; Along the axial direction, at least a portion of the first insulating portion is clamped between the electrode assembly and the second protrusion.

16. The cylindrical battery according to any one of claims 1-15, characterized in that, The diameter of the cylindrical battery is 30mm-70mm.

17. A battery module, characterized in that, Includes multiple cylindrical batteries according to any one of claims 1-16.

18. An electrical appliance, characterized in that, Including the cylindrical battery according to any one of claims 1-16.

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