Cylindrical battery, battery pack and power utilization device

Abstract

The invention provides a cylindrical battery, a battery pack and a power utilization device, the cylindrical battery comprises a top cover and an anti-explosion piece, the top cover comprises a base body, a connecting part and an end part, the end part protrudes out of the base body along the axial direction of the cylindrical battery, and the connecting part is connected with the end part and the base body; at least part of the anti-explosion piece and the top cover are arranged in the axial direction. The base body comprises an extension part and a downward pressing part, the downward pressing part is arranged on one side, facing the axis of the cylindrical battery, of the extension part, the downward pressing part faces the anti-explosion piece and protrudes out of the extension part, and the downward pressing part is attached to the anti-explosion piece. According to the cylindrical battery, the downward pressing part is arranged on the top cover of the cylindrical battery, and when the anti-explosion piece is overturned and exploded under the action of air pressure in the battery, the downward pressing part limits the overturning distance of the anti-explosion piece, so that the risk that the explosion pressure of the anti-explosion piece is too large or the anti-explosion piece does not explode is reduced, meanwhile, the deviation of the explosion pressure is reduced, and the safety performance of the cylindrical battery is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a cylindrical battery, a battery pack and an electrical device. Background Art

[0002] Cylindrical batteries, such as lithium-ion batteries, have the characteristics of high specific energy, high operating voltage, low self-discharge rate, small size and light weight, and are widely used in various fields.

[0003] Cylindrical batteries are usually equipped with a CID (current interrupt device, abbreviated as CID, current cut-off device) inside. The CID includes a burst-proof plate. When an abnormality occurs in the cylindrical battery and the internal pressure is too high, the burst-proof plate flips and explodes to cut off power and release pressure, which is beneficial to improving the safety of the cylindrical battery. When flipping and exploding, there is a risk that the burst-proof plate will flip too far, resulting in excessive explosion pressure or no explosion. Summary of the invention

[0004] The purpose of the present application is to provide a cylindrical battery, a battery pack and an electrical device, which are helpful to reduce the risk of the explosion-proof plate flipping over a large distance or not exploding, and improve the safety performance of the cylindrical battery.

[0005] It should be noted that in the invention content of this application, lithium-ion batteries are used as an example of cylindrical batteries to explain this application, but the cylindrical batteries of this application are not limited to lithium-ion batteries. The specific technical solution is as follows:

[0006] The first aspect of the present application provides a cylindrical battery, including a top cover and an explosion-proof plate, the top cover includes a base, a connecting part and an end, the end protrudes from the base along the axial direction of the cylindrical battery, and the connecting part connects the end and the base; at least part of the explosion-proof plate and the top cover are arranged along the axial direction; the base includes an extension part and a pressing part, the pressing part is arranged on the side of the extension part facing the axis of the cylindrical battery, the pressing part protrudes from the extension part toward the explosion-proof plate, and the pressing part fits the explosion-proof plate. By setting the pressing part on the top cover of the cylindrical battery, when an abnormality occurs inside the battery and the internal air pressure is too high, when the explosion-proof plate flips and explodes under the action of the internal air pressure of the battery, the pressing part limits the flipping distance of the explosion-proof plate, which is conducive to reducing the risk of excessive explosion pressure or non-explosion of the explosion-proof plate, and is conducive to reducing the deviation of the explosion pressure, and improving the safety performance of the cylindrical battery; at the same time, it is conducive to providing a larger accommodation space for the electrode assembly in the shell of the cylindrical battery, thereby facilitating the increase of the volume of the electrode assembly and improving the energy density of the cylindrical battery.

[0007] In one or more embodiments, the extension portion includes a first portion and a second portion, and along the axial direction, the projection of the first portion surrounds the projection of the second portion, and the pressing portion protrudes from the second portion toward the explosion-proof disk; the second portion protrudes away from the explosion-proof disk relative to the first portion, and a first space is formed on the side of the second portion facing the explosion-proof disk, and a part of the explosion-proof disk is located in the first space. Through the above arrangement, it is beneficial to provide a larger accommodating space for the electrode assembly in the shell of the cylindrical battery, which is beneficial to increase the volume of the electrode assembly and improve the energy density of the cylindrical battery.

[0008] In one or more embodiments, the explosion-proof disc includes a flip portion, a protruding portion, and a fixing portion arranged along the radial direction of the cylindrical battery, the fixing portion is connected to the first portion, and at least a portion of the protruding portion is located in the first space. Through the above arrangement, it is beneficial to provide a larger accommodating space for the electrode assembly in the shell of the cylindrical battery, which is beneficial to increase the volume of the electrode assembly and improve the energy density of the cylindrical battery.

[0009] In one or more embodiments, the pressing portion fits the protruding portion. The above arrangement is helpful to reduce the flipping distance of the explosion-proof disk, reduce the risk of the explosion-proof disk having excessive explosion pressure or not exploding, and help reduce the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery.

[0010] In one or more embodiments, the flip portion includes a groove, and along the axial direction, the projection of the pressing portion is separated from the projection of the groove, and in the radial direction of the cylindrical battery, the groove is closer to the axis of the cylindrical battery than the pressing portion. The above arrangement is conducive to reducing the risk of the explosion-proof plate not exploding due to the pressing portion blocking the groove, and is conducive to reducing the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery.

[0011] In one or more embodiments, the projection of the pressing portion partially overlaps the projection of the flipping portion along the axial direction. The above arrangement is conducive to reducing the flipping distance of the explosion-proof disk, reducing the risk of excessive explosion pressure or non-explosion of the explosion-proof disk, and reducing the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery.

[0012] In one or more embodiments, the side of the protrusion facing away from the second part forms a second space; the cylindrical battery also includes a perforated plate and an insulating member, the perforated plate is electrically connected to the flip part, and at least part of the insulating member is arranged between the perforated plate and the explosion-proof disk along the axial direction and is located in the second space. The above arrangement is conducive to providing a storage space for the insulating member, reducing the distance between the part of the flip part that is not electrically connected to the perforated plate and the perforated plate, and providing a larger storage space for the electrode assembly in the shell of the cylindrical battery, which is conducive to increasing the volume of the electrode assembly and improving the energy density of the cylindrical battery.

[0013] In one or more embodiments, the insulating member includes a limiting portion, which is arranged on a side of the orifice plate away from the axis of the cylindrical battery. The above arrangement is conducive to the insulating member limiting the orifice plate in the radial direction of the cylindrical battery, thereby improving the position stability of the orifice plate.

[0014] In one or more embodiments, the orifice plate includes a first surface facing the flip portion, and the first surface is flat. The above arrangement is conducive to reducing the distance between the part of the flip portion that is not electrically connected to the orifice plate and the orifice plate, providing a larger accommodating space for the electrode assembly in the housing of the cylindrical battery, which is conducive to increasing the volume of the electrode assembly and improving the energy density of the cylindrical battery.

[0015] In one or more embodiments, along the circumference of the cylindrical battery, the pressing part includes a plurality of pressing sections arranged at intervals, and the sum of the central angles corresponding to the plurality of pressing sections is A, 210°≤A≤270°. By regulating A within the scope of this application, it is beneficial to disperse the stress on the pressing part, reduce the influence of the deformation of the pressing part under harsh working conditions on the explosion-proof plate, make the explosion-proof plate more uniformly stressed, and the pressing part is not easily deformed, which is beneficial to reduce the flipping distance of the explosion-proof plate, reduce the risk of excessive explosion pressure or no explosion of the explosion-proof plate, and reduce the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery.

[0016] In one or more embodiments, the connecting portion includes a plurality of spaced connecting segments, and along the axial direction, the projection of the pressing segment and the projection of the connecting segment are staggered around the axis of the cylindrical battery. The above arrangement is conducive to dispersing the stress of the pressing portion and the connecting portion, reducing the influence of the deformation of the pressing portion and the connecting portion on each other under harsh working conditions, and is conducive to reducing the flipping distance of the explosion-proof plate and reducing the deviation of the bursting pressure, thereby improving the safety performance of the cylindrical battery.

[0017] A second aspect of the present application provides a battery pack comprising a cylindrical battery according to any of the above embodiments.

[0018] A third aspect of the present application provides an electrical device comprising a cylindrical battery or a battery pack according to any of the above embodiments.

[0019] Beneficial effects of this application:

[0020] The present application provides a cylindrical battery, a battery pack and an electrical device, wherein the cylindrical battery comprises a top cover and an explosion-proof plate, the top cover comprises a base, a connecting part and an end, the end protrudes from the base along the axial direction of the cylindrical battery, and the connecting part connects the end and the base; at least part of the explosion-proof plate and the top cover are arranged along the axial direction; the base comprises an extension part and a pressing part, the pressing part is arranged on the side of the extension part facing the axis of the cylindrical battery, the pressing part protrudes from the extension part toward the explosion-proof plate, and the pressing part fits the explosion-proof plate. By arranging the pressing part on the top cover of the cylindrical battery, when an abnormality occurs inside the battery and the internal air pressure is too high, when the explosion-proof plate flips and explodes under the action of the internal air pressure of the battery, the pressing part limits the flipping distance of the explosion-proof plate, which is conducive to reducing the risk of excessive explosion pressure or non-explosion of the explosion-proof plate, and is conducive to reducing the deviation of the explosion pressure, and improving the safety performance of the cylindrical battery; at the same time, it is conducive to providing a larger accommodation space for the electrode assembly in the shell of the cylindrical battery, thereby facilitating the increase of the volume of the electrode assembly and improving the energy density of the cylindrical battery.

[0021] Of course, implementing any product or method of the present application does not necessarily require achieving all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0023] Figure 1 A schematic diagram of the structure of a cylindrical battery according to an embodiment of the present application;

[0024] Figure 2 for Figure 1 A schematic diagram of a partial cross-sectional structure of a cylindrical battery shown;

[0025] Figure 3 for Figure 2 A magnified view of middle;

[0026] Figure 4 for Figure 1 A schematic cross-sectional view of the top cover of a cylindrical battery shown;

[0027] Figure 5 for Figure 1 A schematic diagram of the structure of the explosion-proof plate of the cylindrical battery shown;

[0028] Figure 6 for Figure 5 A schematic cross-sectional view of the explosion-proof disk shown;

[0029] Figure 7 for Figure 1A schematic cross-sectional structure diagram of a cylindrical battery hole plate is shown;

[0030] Figure 8 for Figure 1 A schematic cross-sectional view of an insulating member of a cylindrical battery shown;

[0031] Fig. 9 for Figure 1 A schematic diagram of the top structure of the cylindrical battery shown;

[0032] Fig.10 for Fig. 9 A schematic cross-sectional view of the top cover shown;

[0033] Fig.11 for Fig.10 The BB cross-sectional structure diagram of the top cover shown;

[0034] Fig.12 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0035] Fig.13 A schematic diagram of the structure of a first electrical device provided in an embodiment of the present application;

[0036] Fig.14 A schematic diagram of the structure of a second electrical device provided in an embodiment of the present application.

[0037] The reference numerals are as follows:

[0038] Top cover 110, base 111, extension portion 1111, first portion 1111A, second portion 1111B, pressing portion 1112, pressing section 11121, connecting portion 112, connecting section 1121, end 113, first distal end 113a, explosion-proof disk 120, flip portion 121, central area 1211, second surface 121a, notch 121A, protrusion 122, fixing portion 123, third surface 123a, orifice plate 130, first surface 130a, second proximal end 130b, insulating member 140, limiting portion 141, housing 150, side wall 151, protrusion 152, first proximal end 152a, electrode assembly 160;

[0039] Cylindrical battery 100, battery pack 200, power-consuming device 300;

[0040] First space C, second space D, radial direction X, axial direction Y, axis direction L, circumferential direction R, center O. DETAILED DESCRIPTION

[0041] The following will be combined with the embodiments of the present application and the accompanying drawings to clearly and completely describe the technical solutions in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the present application belong to the scope of protection of the present application.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0044] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. The various embodiments in the present application may be combined with each other in the absence of conflict.

[0045] In the related art, when the air pressure inside the cylindrical battery reaches a threshold, the explosion-proof plate is deformed due to local force, resulting in a large flipping distance, which makes the pressure required for explosion too high or there is a risk of no explosion, affecting the safety of the cylindrical battery.

[0046] The present application provides a cylindrical battery, a battery pack and an electrical device, the main purpose of which is to improve the safety of the cylindrical battery.

[0047] Figure 1 A schematic diagram of the structure of a cylindrical battery according to an embodiment of the present application is shown in FIG. Figure 1As shown, in the first aspect, the embodiment of the present application provides a cylindrical battery 100, which can be a lithium ion battery, a sodium ion battery, a magnesium ion battery, etc. The axis of the cylindrical battery 100 is L. The radial direction of the cylindrical battery 100 is X, and X is in a plane perpendicular to the axis L, which is the direction from the axis L to the outside of the cylindrical battery 100. The axial direction of the cylindrical battery 100 is Y, and Y is parallel to the axis L of the cylindrical battery 100.

[0048] Figure 2 for Figure 1 The partial cross-sectional structure diagram of the cylindrical battery shown in FIG. Figure 1 and Figure 2 As shown, the first aspect of the present application provides a cylindrical battery 100, which includes a top cover 110 and an explosion-proof disc 120. The top cover 110 includes a base 111, a connecting portion 112 and an end 113, the end 113 protrudes from the base 111 along the axial direction Y of the cylindrical battery 100, and the connecting portion 112 connects the end 113 and the base 111; at least part of the explosion-proof disc 120 and the top cover 110 are arranged along the axial direction Y; the base 111 includes an extension portion 1111 and a pressing portion 1112, the pressing portion 1112 is arranged on the side of the extension portion 1111 facing the axis L of the cylindrical battery 100, the pressing portion 1112 protrudes from the extension portion 1111 toward the explosion-proof disc 120, and the pressing portion 1112 fits the explosion-proof disc 120.

[0049] By setting a pressing portion 1112 on the top cover 110 of the cylindrical battery 100, when an abnormality occurs inside the cylindrical battery 100 and the internal air pressure is too high, when the explosion-proof plate 120 flips and explodes under the action of the internal air pressure of the cylindrical battery 100, the pressing portion 1112 limits the flipping distance of the explosion-proof plate 120, which is beneficial to reducing the risk of excessive explosion pressure or non-explosion of the explosion-proof plate 120, and is beneficial to reducing the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery 100; at the same time, since the pressing portion 1112 limits and shortens the flipping distance of the explosion-proof plate 120, it is beneficial to provide a larger accommodation space for the electrode assembly 160 in the shell 150 of the cylindrical battery 100, thereby facilitating an increase in the volume of the electrode assembly 160 and improving the energy density of the cylindrical battery 100.

[0050] Figure 3 for Figure 2 A magnified image of Figure 4 for Figure 1 The cross-sectional structure diagram of the top cover 110 of the cylindrical battery 100 is shown in FIG. Figure 3 and Figure 4As shown, in one or more embodiments, the extension portion 1111 includes a first portion 1111A and a second portion 1111B, and along the axial direction Y, the projection of the first portion 1111A surrounds the projection of the second portion 1111B, and the pressing portion 1112 protrudes from the second portion 1111B toward the explosion-proof disc 120; the second portion 1111B protrudes away from the explosion-proof disc 120 relative to the first portion 1111A, and a first space C is formed on the side of the second portion 1111B facing the explosion-proof disc 120, and a part of the explosion-proof disc 120 is located in the first space C. Through the above arrangement, it is beneficial to provide a larger accommodating space for the electrode assembly 160 in the housing 150 of the cylindrical battery 100, which is beneficial to increase the volume of the electrode assembly 160 and improve the energy density of the cylindrical battery 100.

[0051] Figure 5 for Figure 1 The structural schematic diagram of the explosion-proof plate 120 of the cylindrical battery 100 is shown in FIG. Figure 6 for Figure 5 The cross-sectional structure diagram of the explosion-proof disk 120 is shown in FIG. Figure 3 , Figure 5 and Figure 6 As shown, in one or more embodiments, the explosion-proof disc 120 includes a flip portion 121, a protruding portion 122 and a fixing portion 123 arranged along the radial direction X of the cylindrical battery 100, the fixing portion 123 is connected to the first portion 1111A, and at least a portion of the protruding portion 122 is located in the first space C. Through the above arrangement, it is beneficial to provide a larger accommodating space for the electrode assembly 160 in the housing 150 of the cylindrical battery 100, which is beneficial to increase the volume of the electrode assembly 160 and improve the energy density of the cylindrical battery 100.

[0052] In one or more embodiments, the pressing portion 1112 is in contact with one side of the protruding portion 122 close to the axis L and the edge of the flip portion 121 close to the protruding portion 122. The above arrangement is helpful to reduce the flipping distance of the explosion-proof disk 120, reduce the risk of excessive explosion pressure or non-explosion of the explosion-proof disk 120, and help reduce the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery 100.

[0053] In one or more embodiments, the cylindrical battery 100 includes a shell 150 and an electrode assembly 160 disposed in the shell 150; the portion where the flip portion 121 is connected to the protruding portion 122 has a second surface 121a facing the electrode assembly 160; the portion where the fixing portion 123 is connected to the protruding portion 122 has a third surface 123a facing the electrode assembly 160; in the axial direction Y, the distance between the second surface 121a and the third surface 123a does not exceed 0.1 mm, but is not limited thereto. The fixing portion 123 and the flip portion 121 do not occupy too much accommodation space in the shell 150, and the flip portion 121 of the explosion-proof disc 120 is closer to the end 113, providing a larger accommodation space for the electrode assembly 160 in the shell 150 of the cylindrical battery 100, which is conducive to increasing the volume of the electrode assembly 160 and improving the energy density of the cylindrical battery 100.

[0054] In one or more embodiments, along the axial direction Y, the second surface 121 a extends beyond the third surface 123 a .

[0055] In one or more embodiments, along the axial direction Y, the third surface 123 a extends beyond the second surface 121 a .

[0056] In one or more embodiments, the pressing portion 1112 fits the protruding portion 122. The above arrangement is helpful to reduce the flipping distance of the explosion-proof disc 120, reduce the risk of excessive explosion pressure or non-explosion of the explosion-proof disc 120, and help reduce the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery 100.

[0057] In one or more embodiments, the flip portion 121 includes a groove 121A, and along the axial direction Y, the projection of the pressing portion 1112 is separated from the projection of the groove 121A, and in the radial direction X of the cylindrical battery 100, the groove 121A is closer to the axis L of the cylindrical battery 100 than the pressing portion 1112. The above arrangement is conducive to reducing the risk of the explosion-proof disk 120 not exploding due to the pressing portion 1112 blocking the groove 121A, and is conducive to reducing the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery 100.

[0058] In one or more embodiments, the notch 121A is in a non-closed arc shape. When the internal air pressure of the cylindrical battery 100 is too high, the notch 121A of the explosion-proof plate 120 cracks to form a vent, and the high-pressure gas inside the cylindrical battery 100 is released to the outside through the vent. Since the notch 121A is in a non-closed arc shape, the flip part 121 of the explosion-proof plate 120 is not easy to be completely separated, which is conducive to improving the safety performance of the cylindrical battery 100.

[0059] In one or more embodiments, along the axial direction Y, the projection of the pressing portion 1112 partially overlaps with the projection of the flipping portion 121. The above arrangement is helpful to reduce the flipping distance of the explosion-proof disc 120, reduce the risk of excessive explosion pressure or non-explosion of the explosion-proof disc 120, and help reduce the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery 100.

[0060] In one or more embodiments, the side of the protrusion 122 facing away from the second part 1111B forms a second space D; the cylindrical battery 100 further includes a perforated plate 130 and an insulating member 140, the perforated plate 130 and the flip part 121 are electrically connected, and along the axial direction Y, at least a portion of the insulating member 140 is disposed between the perforated plate 130 and the explosion-proof disk 120, and is located in the second space D. The above arrangement is conducive to providing a holding space for the insulating member 140, reducing the distance between the part of the flip part 121 that is not electrically connected to the perforated plate 130 and the perforated plate 130, providing a larger holding space for the electrode assembly 160 in the housing 150 of the cylindrical battery 100, and facilitating an increase in the volume of the electrode assembly 160, and improving the energy density of the cylindrical battery 100.

[0061] In one or more embodiments, the housing 150 includes a side wall 151 surrounding the electrode assembly 160, the side wall 151 is provided with a convex portion 152 protruding toward the axis L of the cylindrical battery 100, and a portion of the top cover 110 is located on the side of the convex portion 152 facing away from the electrode assembly 160; along the axial direction Y, the convex portion 152 includes a first proximal end 152a close to the electrode assembly 160, the end portion 113 includes a first distal end 113a away from the electrode assembly 160, along the axial direction Y, the distance between the first proximal end 152a and the first distal end 113a is L1, along the axial direction Y, the orifice plate 130 includes a second proximal end 130b close to the electrode assembly 160, along the axial direction Y, the distance between the second proximal end 130b and the first distal end 113a is L2; ​​60%≤L2 / L1≤80%, but not limited thereto. Optionally, 60%≤L2 / L1≤70%. For example, L2 / L1 can be: 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, or a range consisting of any two values ​​therebetween. Compared with the prior art, L2 / L1 accounts for a smaller proportion, and along the axial direction Y, relative to the first proximal end 152a of the convex portion 152, the orifice plate 130 is closer to the first distal end 113a, which is conducive to providing a larger accommodation space for the electrode assembly 160 in the shell 150 of the cylindrical battery 100, increasing the volume of the electrode assembly 160, and improving the energy density of the cylindrical battery 100.

[0062] The cylindrical battery 100 of the present application is not limited to being a primary battery or a secondary battery. In the following embodiments, the cylindrical battery 100 is a lithium-ion secondary battery as an example. In one or more embodiments, the electrode assembly 160 includes a first pole piece, a second pole piece, and a diaphragm. The first pole piece and the second pole piece have opposite polarities, and the diaphragm is disposed between the first pole piece and the second pole piece. During the charge and discharge process of the lithium-ion secondary battery, lithium ions are inserted and removed back and forth between the first pole piece and the second pole piece.

[0063] In one or more embodiments, the first pole piece includes a first body and a first pole ear, and the second pole piece includes a second body and a second pole ear. The first body includes a first current collector and a first active material layer coated on the surface of the first current collector, and the first pole ear is connected to the first current collector. The second body includes a second current collector and a second active material layer coated on the surface of the second current collector, and the second pole ear is connected to the second current collector. The top cover 110 is electrically connected to the first pole ear of the electrode assembly 160, and the top cover 110 forms the first electrode terminal of the cylindrical battery 100. The housing 150 is electrically connected to the second pole ear of the electrode assembly 160 to form the second electrode terminal of the cylindrical battery 100. One of the first electrode terminal and the second electrode terminal is a positive electrode, and the other is a negative electrode. Thus, replacing a traditional electrode terminal is conducive to simplifying the structure of the cylindrical battery 100. In one or more embodiments, the first pole ear and the first current collector are an integral piece. In one or more embodiments, the second pole ear and the second current collector are an integral piece.

[0064] In one or more embodiments, the first pole ear and the second pole ear are both flattened pole ears. Along the axial direction Y, the height of the portion where the protrusion 152 presses down the electrode assembly 160 is lower than the height of the central portion of the electrode assembly 160 , which is beneficial for the protrusion 152 to compact the edge portion of the electrode assembly 160 and improve the positional stability of the electrode assembly 160 .

[0065] In one or more embodiments, 3.13mm≤L1≤5.83mm, but not limited thereto. For example, L1 may be: 3.13mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.83mm, or a range consisting of any two values ​​therebetween. In one or more embodiments, 2.5mm≤L2≤3.5mm, but not limited thereto. For example, L2 can be: 2.5mm, 2.55mm, 2.6mm, 2.65mm, 2.7mm, 2.75mm, 2.8mm, 2.85mm, 2.9mm, 2.95mm, 3.0mm, 3.05mm, 3.1mm, 3.15mm, 3.2mm, 3.25mm, 3.3mm, 3.35mm, 3.4mm, 3.45mm, 3.5mm, or a range of any two values ​​therebetween. Compared with the prior art, along the axial direction Y, the distance between the second proximal end 130b and the first distal end 113a is smaller, and relative to the first proximal end 152a of the protrusion 152, the orifice plate 130 is closer to the first distal end 113a, which is conducive to providing a larger accommodation space for the electrode assembly 160 in the shell 150 of the cylindrical battery 100, increasing the volume of the electrode assembly 160, and improving the energy density of the cylindrical battery 100.

[0066] Figure 7 for Figure 1 The cross-sectional structure diagram of the orifice plate 130 of the cylindrical battery 100 is shown in FIG. Figure 7 As shown, in one or more embodiments, the orifice plate 130 includes a first surface 130a facing the flip portion 121, and the first surface 130a is flat. Through the above arrangement, it is helpful to reduce the distance between the part of the flip portion 121 that is not electrically connected to the orifice plate 130 and the orifice plate 130, and provide a larger accommodating space for the electrode assembly 160 in the housing 150 of the cylindrical battery 100, which is helpful to increase the volume of the electrode assembly 160 and improve the energy density of the cylindrical battery 100.

[0067] In one or more embodiments, the flip portion 121 includes a central area 1211 protruding toward the orifice plate 130, and the central area 1211 is welded to the orifice plate 130; along the direction from the top cover 110 to the electrode assembly 160, the distance of the central area 1211 beyond the second surface 121a is L3, 0.1mm≤L3≤0.2mm, but not limited thereto. For example, L3 can be: 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.20mm, or a range consisting of any two values ​​therebetween. Compared with the prior art, along the direction of the top cover 110 pointing to the electrode assembly 160, the distance that the central area 1211 exceeds the second surface 121a is smaller, which is beneficial to reducing the distance between the second surface 121a of the flip portion 121 and the orifice plate 130, providing a larger accommodating space for the electrode assembly 160 in the cylindrical battery 100, increasing the volume of the electrode assembly 160, and improving the energy density of the cylindrical battery 100.

[0068] Figure 8 for Figure 1 The cross-sectional structure diagram of the insulating member 140 of the cylindrical battery 100 is shown. Figure 8 As shown, in one or more embodiments, the insulating member 140 includes a limiting portion 141, and the limiting portion 141 is disposed on a side of the orifice plate 130 away from the axis L of the cylindrical battery 100. Through the above arrangement, it is beneficial for the insulating member 140 to limit the orifice plate 130 in the radial direction X of the cylindrical battery 100, thereby improving the position stability of the orifice plate 130.

[0069] Fig. 9 for Figure 1 The top view of the top cover 110 of the cylindrical battery 100 is shown in FIG. Fig.10 for Fig. 9 The cross-sectional structure diagram of the top cover 110 is shown in FIG. Fig.11 for Fig.10 The BB cross-sectional structure diagram of the top cover 110 is shown in FIG. Fig. 9 , Fig.10 and Fig.11 As shown, in one or more embodiments, along the circumferential direction R of the cylindrical battery 100, the pressing portion 1112 includes a plurality of pressing segments 11121 arranged at intervals, combined with Fig.11As shown, in a circle with the center O of the top cover 110 as the center, the central angle corresponding to the pressing section 11121 is α, and the sum of the central angles α corresponding to the multiple pressing sections 11121 is A, 210°≤A≤270°. The value of A can be 210°, 211°, 212°, 213°, 214°, 215°, 216°, 217°, 218°, 219°, 220°, 221°, 222°, 223°, 224°, 225°, 226°, 227°, 228°, 229°, 230°, 231°, 232°, 233°, 234°, 235°, 236°, 237°, 238°, 239°, 240°, 241°, 242°, 243°, 244°, 245°, 246°, 247°, 248°, 249°, 250°, 251°, 252°, 253°, 254°, 255°, 256°, 257°, ​​258°, 259°, 260°, 261°, 262°, 263°, 264°, 265°, 266°, 267°, 268°, 269°, 270°, 271°, 272°, 273°, 274°, 275°, 276°, 277°, 278°, 279°, 280°, 1°, 242°, 243°, 244°, 245°, 246°, 247°, 248°, 249°, 250°, 251°, 252°, 253°, 254°, 255°, 256°, 257°, ​​258°, 259°, 260°, 261°, 262°, 263°, 264°, 265°, 266°, 267°, 268°, 269°, 270°, or a range consisting of any two values ​​therebetween.

[0070] By regulating A within the scope of the present application, it is beneficial to disperse the stress on the pressing down portion 1112, reduce the influence of the deformation of the pressing down portion 1112 under severe working conditions on the explosion-proof plate 120, make the force on the explosion-proof plate 120 more uniform, and the pressing down portion 1112 is not easily deformed, which is beneficial to reduce the flipping distance of the explosion-proof plate 120, reduce the risk of excessive explosion pressure or no explosion of the explosion-proof plate 120, and help reduce the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery 100.

[0071] In one or more embodiments, the central angles α of the multiple downward pressing sections 11121 are all equal, so that the explosion-proof plate 120 is subjected to more uniform force, and the downward pressing portion 1112 is not easily deformed, which is beneficial to reducing the flipping distance of the explosion-proof plate 120, reducing the risk of excessive explosion pressure or no explosion of the explosion-proof plate 120, and helping to reduce the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery 100.

[0072] In one or more embodiments, at least two of the central angles α of the plurality of pressing-down segments 11121 are not equal.

[0073] In one or more embodiments, the connecting portion 112 includes a plurality of spaced connecting segments 1121, and along the axial direction Y, the projection of the pressing segment 11121 and the projection of the connecting segment 1121 are staggered around the axis L of the cylindrical battery 100. The above arrangement is conducive to dispersing the stress of the pressing portion 1112 and the connecting portion 112, reducing the influence of the deformation of the pressing portion 1112 and the connecting portion 112 under harsh working conditions on each other, and is conducive to reducing the flipping distance of the explosion-proof plate 120, reducing the deviation of the bursting pressure, and thus improving the safety performance of the cylindrical battery 100.

[0074] In one or more embodiments, in combination Fig. 9 As shown, in a circle with the center O of the top cover 110 as the center, the central angle β corresponding to the connecting segment 1121 is β, the central angles β of the multiple connecting segments 1121 are equal, the multiple connecting segments 1121 are evenly distributed, the top cover 110 is more evenly stressed, the top cover 110 is not easily deformed, which is beneficial to suppress the deformation of the raised portion 122 and the fixed portion 123 of the explosion-proof plate 120, which is beneficial to reduce the flipping distance of the explosion-proof plate 120, reduce the risk of excessive explosion pressure or no explosion of the explosion-proof plate 120, and help reduce the deviation of the explosion pressure, thereby improving the safety performance of the cylindrical battery 100.

[0075] In a second aspect, the present application provides a battery pack 200, Fig.12 A schematic diagram of the structure of the battery pack provided in the embodiment of the present application, such as Fig.12 As shown, the battery pack 200 includes the cylindrical battery 100 of any of the above embodiments. There is at least one cylindrical battery 100. In one or more embodiments, there are multiple cylindrical batteries 100, and the multiple cylindrical batteries 100 are connected in series or in parallel, or the multiple cylindrical batteries 100 are combined in series and in parallel.

[0076] In a third aspect, the present application provides an electrical device 300, comprising a cylindrical battery 100 or a battery pack 200 according to any of the above embodiments.

[0077] In one or more embodiments, Fig.13 A schematic diagram of the structure of the first electrical device provided in the embodiment of the present application is shown in FIG. Fig.13 As shown, the electric device 300 includes the battery pack 200 in the above embodiment, and the battery pack 200 includes the cylindrical battery 100 in the above embodiment.

[0078] In one or more embodiments, Fig.14 A schematic diagram of the structure of a second electrical device provided in an embodiment of the present application is shown in FIG. Fig.14 As shown, the electric device 300 includes the cylindrical battery 100 in the above embodiment.

[0079] The present application does not specifically limit the electrical device, which includes but is not limited to a backup power supply, a two-wheeled vehicle, a power tool or an energy storage device.

Claims

1. A cylindrical battery, characterized in that: include: A top cover, comprising a base, a connecting portion and an end portion, wherein the end portion protrudes out of the base along the axial direction of the cylindrical battery, and the connecting portion connects the end portion and the base; A bursting disk, at least a portion of which and the top cover are arranged along the axial direction; The base comprises an extension portion and a pressing portion, wherein the pressing portion is arranged on a side of the extension portion facing the axis of the cylindrical battery, the pressing portion protrudes from the extension portion toward the explosion-proof plate, and the pressing portion fits the explosion-proof plate.

2. The cylindrical battery according to claim 1, characterized in that: The extension portion includes a first portion and a second portion, and along the axial direction, the projection of the first portion surrounds the projection of the second portion, and the pressing portion protrudes from the second portion toward the explosion-proof disk; The second portion protrudes relative to the first portion and away from the bursting disk, and a first space is formed on a side of the second portion facing the bursting disk, wherein a portion of the bursting disk is located in the first space.

3. The cylindrical battery according to claim 2, characterized in that: The explosion-proof plate includes a turning portion, a protruding portion and a fixing portion arranged along the radial direction of the cylindrical battery, the fixing portion is connected to the first portion, and at least a part of the protruding portion is located in the first space.

4. The cylindrical battery according to claim 3, characterized in that: The pressing portion is in contact with the protruding portion.

5. The cylindrical battery according to claim 4, characterized in that: The flip portion includes a groove, and along the axial direction, the projection of the pressing portion is separated from the projection of the groove. In the radial direction of the cylindrical battery, the groove is closer to the axis of the cylindrical battery than the pressing portion.

6. The cylindrical battery according to claim 5, characterized in that: Along the axial direction, a projection of the pressing portion partially overlaps with a projection of the turning portion.

7. The cylindrical battery according to any one of claims 3 to 6, characterized in that: A second space is formed on a side of the protrusion facing away from the second portion; The cylindrical battery further includes a perforated plate and an insulating member, wherein the perforated plate is electrically connected to the flip portion, and along the axial direction, at least a portion of the insulating member is disposed between the perforated plate and the explosion-proof disk and is located in the second space.

8. The cylindrical battery according to claim 7, characterized in that: The insulating member includes a limiting portion, and the limiting portion is arranged on a side of the orifice plate away from the axis of the cylindrical battery.

9. The cylindrical battery according to claim 7 or 8, characterized in that: The orifice plate comprises a first surface facing the turning portion, and the first surface is flat.

10. The cylindrical battery according to any one of claims 1 to 9, characterized in that: Along the circumference of the cylindrical battery, the pressing portion includes a plurality of pressing segments arranged at intervals, and the sum of the central angles α corresponding to the plurality of pressing segments is A, and 210°≤A≤270°.

11. The cylindrical battery according to claim 10, characterized in that: The connecting portion includes a plurality of connecting segments arranged at intervals, and along the axial direction, the projection of the pressing down segment and the projection of the connecting segment are staggered around the axis.

12. A battery pack, characterized in that: A cylindrical battery comprising any one of claims 1 to 11.

13. An electrical device, characterized in that: A cylindrical battery comprising any one of claims 1 to 11 or a battery pack according to claim 12.

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