Cylindrical battery, battery pack, and electrical device

Abstract

The present application provides a cylindrical battery, a battery pack, and an electrical device. The cylindrical battery comprises a casing and an electrode assembly, the casing comprises a side wall and a bottom wall, the side wall and the bottom wall form an accommodating space, the side wall comprises a recess, and the recess is recessed towards the axis of the cylindrical battery; the electrode assembly is arranged in the accommodating space, the electrode assembly and the bottom wall are arranged in the axial direction of the cylindrical battery, the electrode assembly has a first end face away from the bottom wall, and the first end face is insulated from and connected to the recess; the first end face comprises a first area and a second area, and the second area is closer to the axis than the first area; in the axial direction, the projection of the recess and the projection of the first area are overlapped, and the projection of the recess is separated from the projection of the second area; in the axial direction, the distance between the first area and the bottom wall is H1, and the distance between the second area and the bottom wall is H2, wherein H2>H1.

Description

Cylindrical battery, battery pack and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a cylindrical battery, a battery pack and an electric device. BACKGROUND

[0002] With the rapid development of new energy technology, large-size and large-capacity secondary batteries are gradually becoming a popular demand in the market. In the fields of electric vehicles, energy storage systems and power tools, the demand for large-size and large-capacity secondary batteries is continuously expanding.

[0003] Among them, the shell of the secondary battery is provided with an electrode assembly. When the secondary battery is in a working condition such as vibration or falling, the electrode assembly is easy to move in the secondary battery shell, impact other components, and affect the service life of the secondary battery.

[0004] SUMMARY

[0005] The purpose of the present application is to provide a cylindrical battery, a battery pack and an electric device to improve the service life of the cylindrical battery, the battery pack and the electric device. The specific technical solutions are as follows:

[0006] The first aspect of the present application provides a cylindrical battery, comprising: a shell comprising a side wall and a bottom wall, the side wall and the bottom wall forming an accommodation space, the side wall comprising a groove recessed towards the axis of the cylindrical battery; an electrode assembly arranged in the accommodation space, the electrode assembly and the bottom wall being arranged along the axial direction of the cylindrical battery, the electrode assembly having a first end face away from the bottom wall, the first end face being insulatedly connected with the groove; the first end face comprises a first region and a second region, the second region being closer to the axis than the first region, along the axial direction, the projection of the groove and the projection of the first region overlap, and the projection of the groove and the projection of the second region are separated; along the axial direction, the distance between the first region and the bottom wall is H1, and the distance between the second region and the bottom wall is H2, H2>H1. By pressing the first region with the groove, the part of the electrode assembly away from the axis is extruded, the height of the part of the electrode assembly away from the axis is lower than the height of the part of the electrode assembly close to the axis, and the electrode assembly forms an interference fit between the groove and the bottom wall, which is conducive to inhibiting the movement of the electrode assembly, improving the stability of the electrode assembly in the shell, and improving the service life of the cylindrical battery.

[0007] In one or more embodiments, further comprising: a first insulating member arranged between the groove and the first region along the axial direction and connecting the groove and the first region. The groove applies pressure to the first region of the electrode assembly through the first insulating member, which is conducive to dispersing the pressure on the electrode assembly and reducing the problem of excessive concentration of pressure applied to the electrode assembly.

[0008] In one or more embodiments, the first insulating piece projects axially to meet the projection of the second region, which helps to reduce the interference of the first insulating piece with other components inside the cylindrical battery, and facilitates the connection of the electrode assembly and other components.

[0009] In one or more embodiments, the thickness of the first insulating piece is H3, and 0.5H3≤H2-H1≤2H3, which helps to press the groove against the electrode assembly and reduce the risk of electrode assembly movement.

[0010] In one or more embodiments, H3≤H2-H1≤1.5H3, which, compared to a larger pressing distance on the first region, helps to reduce the pressing force on the electrode assembly separator and improves the safety of the electrode assembly separator. Compared to a smaller pressing distance on the first region, H3≤H2-H1 helps to suppress the movement of the electrode assembly.

[0011] In one or more embodiments, 0.4mm≤H3≤0.8mm, which helps to improve the pressure-bearing capacity and insulation performance of the first insulating piece.

[0012] In one or more embodiments, the first insulating piece is a ring-shaped piece that includes an outer edge away from the axis and an inner edge close to the axis, and the outer edge is closer to the bottom wall than the inner edge. This helps to press the groove against the electrode assembly and reduce the risk of electrode assembly movement.

[0013] In one or more embodiments, the first insulating piece includes a first surface and a second surface, and the first surface is closer to the first region than the second surface; the first surface and a first plane intersect at a first intersection line, wherein the first plane is a plane containing the axis; the angle between the first intersection line and a second plane perpendicular to the axis is α1, and 5°≤α1≤20°. The extrusion of the ring-shaped piece makes it have a certain angle with the second plane perpendicular to the axis, which helps to improve the pressing effect of the groove on the electrode assembly and reduce the risk of electrode assembly movement.

[0014] In one or more embodiments, the first region is the region where the first insulating piece and the first end surface are connected; along the radial direction of the cylindrical battery, the second region meets the first region and extends to the center hole of the electrode assembly.

[0015] In one or more embodiments, the material of the first insulating piece includes at least one of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate, or polybutylene terephthalate. The use of the above-mentioned materials for the first insulating piece helps to provide good insulation and cushioning performance.

[0016] In one or more embodiments, the groove comprises a first groove side wall, a groove bottom wall and a second groove side wall connected in sequence, the first groove side wall is closer to the bottom wall than the second groove side wall, the first groove side wall comprises a third surface and a fourth surface, the third surface is farther away from the second groove side wall than the fourth surface, the third surface and the first plane intersect at a second intersection line, wherein the first plane is a plane containing the axis; the second groove side wall comprises a fifth surface and a sixth surface, the fifth surface is farther away from the first groove side wall than the sixth surface, the fifth surface and the first plane intersect at a third intersection line; the included angle between the second intersection line and the side wall connected with the first groove side wall is α2, 60°≤α2≤70°, by designing the downward angle of the first groove side wall relative to the side wall, the compaction effect of the groove on the electrode assembly is improved, and the movement of the electrode assembly is inhibited.

[0017] In one or more embodiments, the included angle between the third intersection line and the side wall connected with the second groove side wall is α3, 85°≤α3≤100°, by designing the downward angle of the second groove side wall relative to the side wall, the compaction effect of the groove on the electrode assembly is improved, and the movement of the electrode assembly is inhibited.

[0018] In one or more embodiments, along the radial direction of the cylindrical battery, the depth of the groove is D1, 2mm≤D1≤4mm, which is beneficial to improve the compaction effect of the groove on the electrode assembly and inhibit the movement of the electrode assembly.

[0019] In one or more embodiments, the first insulating piece is an annular sheet, the width of the annular sheet is D2, 2≤D2 / D1≤3, which is beneficial to disperse the pressure on the electrode assembly and reduce the problem of excessive concentration of pressure applied to the electrode assembly.

[0020] In one or more embodiments, the cylindrical battery further comprises: an end cover arranged along the axial direction with the electrode assembly; the end cover is provided with a protrusion extending towards the electrode assembly along the axial direction, the first insulating piece is arranged between the protrusion and the first region and connects the protrusion and the first region. The protrusion and the groove jointly apply pressure to the electrode assembly, which is beneficial to more stably arrange the electrode assembly in the shell and further improve the compaction effect of the electrode assembly in the shell.

[0021] In one or more embodiments, further comprising: a second insulating piece; the second insulating piece comprises a first part, the protrusion, the first part, the first insulating piece and the first region are arranged in sequence along the axial direction, and the first part connects the protrusion and the first insulating piece. The first part and the first insulating piece are both arranged between the protrusion and the first region, which is beneficial to improve the insulation effect between the protrusion and the first region.

[0022] In one or more embodiments, the diameter of the cylindrical battery is D, 30mm≤D≤100mm; and / or, the length of the cylindrical battery is L, 45mm≤L≤135mm, which is beneficial to realize a large-size and large-capacity cylindrical battery.

[0023] The second aspect of the present application provides a battery pack, comprising the cylindrical battery in any of the above embodiments.

[0024] The third aspect of the present application provides a power consumption device, comprising the battery pack in any of the above embodiments or the cylindrical battery in any of the above embodiments.

[0025] The beneficial effects of the present application are as follows:

[0026] The present application provides a cylindrical battery, a battery pack and a power consumption device, comprising a shell and an electrode assembly, the shell comprises a side wall and a bottom wall, the side wall and the bottom wall form an accommodation space, the side wall comprises a groove recessed towards the axis of the cylindrical battery. The electrode assembly is arranged in the accommodation space, the electrode assembly and the bottom wall are arranged along the axial direction of the cylindrical battery, the electrode assembly has a first end face away from the bottom wall, and the first end face is insulatedly connected with the groove; the first end face comprises a first region and a second region, the second region is closer to the axis than the first region, along the axial direction, the projection of the groove and the projection of the first region overlap, the projection of the groove and the projection of the second region are separated, and the groove can exert pressure on the first region, so that along the axial direction, the distance between the first region and the bottom wall is smaller than the distance between the second region and the bottom wall. Compared with the prior art, in the embodiment of the present application, the first region of the electrode assembly is closer to the bottom wall by being extruded by the groove, and the electrode assembly forms an interference fit between the groove and the bottom wall, which is beneficial to inhibit the movement of the electrode assembly, improve the stability of the electrode assembly in the shell, and improve the service life of the cylindrical battery, the battery pack and the power consumption device. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are included to provide a further understanding of the present application, form a part of the present application and illustrate the illustrative embodiments of the present application and its description, which are used to explain the present application, and do not constitute improper limitations on the present application.

[0028] FIG. 1 is a structural schematic diagram of a cylindrical battery according to an embodiment of the present application;

[0029] FIG. 2 is a partial cross-sectional structural schematic diagram of a cylindrical battery according to an embodiment of the present application;

[0030] FIG. 3 is an enlarged view of A in FIG. 2;

[0031] FIG. 4 is a structural schematic diagram of a first insulating piece of a cylindrical battery according to an embodiment of the present application;

[0032] FIG. 5 is a partial structural schematic diagram of a cylindrical battery shell according to an embodiment of the present application;

[0033] FIG. 6 is a structural schematic diagram of a battery pack according to an embodiment of the present application;

[0034] FIG. 7 is a structural schematic diagram of a first kind of electric device according to an embodiment of the present application;

[0035] FIG. 8 is a structural schematic diagram of a second kind of electric device according to an embodiment of the present application.

[0036] The reference signs are as follows: shell 10, side wall 11, groove 111, fifth end 111a, first groove side wall 112, third surface 112A, fourth surface 112B, groove bottom wall 113, second groove side wall 114, fifth surface 114A, sixth surface 114B, bottom wall 12, accommodating space 13, top wall 14, electrode assembly 20, first end surface 21, first region 211, first end 211a, second end 211b, second region 212, third end 212a, fourth end 212b, center hole 22, first insulating member 30, first surface 30A, second surface 30B, annular sheet 31, outer edge 311, inner edge 312, end cap 40, convex part 41, second insulating member 50, first part 51, second part 52; axial direction X, radial direction Y, axis L0, first intersection line L1, second intersection line L2, third intersection line L3, first plane P1, second plane P2, distance H1 of first region to bottom wall, distance H2 of second region to bottom wall, thickness H3 of first insulating member, diameter D of cylindrical battery, length L of cylindrical battery, depth D1 of groove, width D2 of annular sheet. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application.

[0038] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be insulatively connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meanings of the above terms in the present 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.

[0039] In the description of the embodiments of the present application, the technical terms "first", "second" and the like 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 two or more, unless otherwise specifically limited.

[0040] Reference to“an embodiment” or“the embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in one embodiment” or“in at least one embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment. Various embodiments of the application can be combined with each other, if not mutually exclusive, unless expressly excluded.

[0041] It should be noted that the thickness, length, width and other dimensions of various components in the embodiments of the application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0042] The inventor realized that, with the increase in the size of the secondary battery, the weight of the electrode assembly in the large-size secondary battery is also larger than that in the small-size secondary battery. When the secondary battery is subjected to working conditions such as vibration or dropping, the electrode assembly is prone to move within the secondary battery shell, which will impact the internal structure of the secondary battery and affect the service life of the secondary battery.

[0043] Cylindrical battery embodiment

[0044] FIG. 1 is a schematic structural diagram of a cylindrical battery according to an embodiment of the application. In a first aspect, the application provides a cylindrical battery 100. A first plane P1 is a plane containing an axis L0 of the cylindrical battery 100, and a second plane P2 is a plane perpendicular to the axis L0.

[0045] FIG. 2 is a schematic structural diagram of a partial cross-section of a cylindrical battery according to an embodiment of the application. FIG. 2 is a cross-sectional view of the first plane P1 of the cylindrical battery 100. As shown in FIGS. 1 and 2, the cylindrical battery 100 includes a shell 10 and an electrode assembly 20.

[0046] In one or more embodiments, the shell 10 includes a side wall 11 and a bottom wall 12, the side wall 11 and the bottom wall 12 form a containing space 13, the side wall 11 includes a groove 111 recessed towards the axis L0 of the cylindrical battery 100; the electrode assembly 20 is arranged in the containing space 13, the electrode assembly 20 and the bottom wall 12 are arranged along the axial direction X of the cylindrical battery 100, the electrode assembly 20 has a first end surface 21 away from the bottom wall 12, the first end surface 21 is insulatedly connected with the groove 111, wherein the insulated connection refers to that the electrical connection between two connected components is electrically insulated, so that the current does not flow between the two components. In one or more embodiments, an insulating material is arranged between the two components, and the insulating material is connected with the two components respectively, so that the current does not flow between the two components. In this way, in one or more embodiments, an insulating material is arranged between the first end surface 21 and the groove 111, and the insulating material is connected with the first end surface 21 and the groove 111 respectively, so that the current does not flow between the first end surface 21 and the groove 111; the first end surface 21 includes a first region 211 and a second region 212, the second region 212 is closer to the axis L0 than the first region 211 along the axial direction X, the projection of the groove 111 and the projection of the first region 211 overlap, and the projection of the groove 111 and the projection of the second region 212 are apart; along the axial direction X, the distance between the first region 211 and the bottom wall 12 is H1, and the distance between the second region 212 and the bottom wall 12 is H2, H2>H1.

[0047] The above embodiment presses the first region 211 of the electrode assembly 20 by the groove 111, so that the distance H1 between the first region 211 of the electrode assembly 20 and the bottom wall 12 along the axial direction X is less than the distance H2 between the second region 212 of the electrode assembly 20 and the bottom wall 12. Wherein, the first region 211 of the electrode assembly 20 away from the axis L0 is pressed down by the groove 111, and the distance between the first region 211 of the electrode assembly 20 and the bottom wall 12 is smaller, the first region 211 of the electrode assembly 20 away from the axis L0 is pressed between the groove 111 and the bottom wall 12, and the electrode assembly 20 forms an interference fit between the groove 111 and the bottom wall 12, thus, it is beneficial to inhibit the movement of the electrode assembly 20, improve the stability of the electrode assembly 20 in the shell 10, and improve the service life of the cylindrical battery 100.

[0048] The cylindrical battery 100 provided by the above embodiment can be suitable for large-size cylindrical batteries 100, which is beneficial to improve the service life of large-size cylindrical batteries 100, but is not limited to large-size cylindrical batteries 100.

[0049] In one or more embodiments, the diameter of the cylindrical battery 100 is D, and 30mm≤D≤100mm. For example, D can be: 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, or a range between any two of them.

[0050] In one or more embodiments, the length of the cylindrical battery 100 is L, and 45 mm≤L≤135 mm. For example, L can be: 45 mm, 50 mm, 55 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 125 mm, 130 mm, 135 mm, or a range between any two of them.

[0051] Measurement of H1:

[0052] Referring to FIG. 2, the first area 211 is a force area under the pressure of the groove 111 (including direct pressure or indirect pressure). The distribution of the force area and the groove 111 matches, for example, the first area 211 includes a ring-shaped area or a plurality of sub-areas distributed at intervals, along the radial direction Y of the cylindrical battery 100, from the first end 211a of the first area 211 away from the axis L0 to the second end 211b of the first area 211 close to the axis L0, which is equally divided into 10 sections along the radial direction Y. The height gauge is used to collect the distance between the two ends of the 10 sections relative to the inner surface of the bottom wall 12, a total of 11 values, and the average value is obtained H1.

[0053] Measurement of H2:

[0054] Referring to FIG. 2, the second area 212 is an area not under the pressure of the groove 111. Along the radial direction Y of the cylindrical battery 100, from the third end 212a of the second area 212 away from the axis L0 to the fourth end 212b of the second area 212 close to the axis L0, which is equally divided into 10 sections along the radial direction Y. The height gauge is used to collect the distance between the two ends of the 10 sections relative to the inner surface of the bottom wall 12, a total of 11 values, and the average value is obtained H2.

[0055] Measurement of D:

[0056] Through the KineMetric IM 8000 tester, 20 collection points are evenly taken around the outer contour of the cylindrical battery 100, and the center is fitted through the collection points. The center is connected with the 20 collection points respectively to form 20 lines of connection. The 20 lines of connection are extended and intersected with the outer contour of the cylindrical battery 100 at 20 intersection points. The distance between the collection point and the intersection point in each line of connection is measured, a total of 20 values, and the average value is obtained D, which is the diameter of the cylindrical battery 100.

[0057] End cover

[0058] Please refer to FIG. 1 and 2, in one or more embodiments, the cylindrical battery 100 further comprises an end cap 40 arranged axially X with the electrode assembly 20. The end cap 40 is provided with a protrusion 41 extending towards the electrode assembly 20, the protrusion 41 and the electrode assembly 20 are insulatedly connected, the protrusion 41 and the groove 111 jointly press the electrode assembly 20, which is conducive to the electrode assembly 20 being more stably arranged in the shell 10, and further improves the compaction effect of the electrode assembly 20 in the shell 10.

[0059] In one or more embodiments, the protrusion 41 of the end cap 40 is made of metal material, which is conducive to improving the strength of the protrusion 41 to the electrode assembly 20.

[0060] In one or more embodiments, as viewed along the axial X, the protrusion 41 is a closed ring, which presses the electrode assembly 20 around the axis L0, which is conducive to improving the stability of the protrusion 41 to the electrode assembly 20, but is not limited thereto.

[0061] First insulating member

[0062] Please refer to FIG. 2, in one or more embodiments, the cylindrical battery 100 further comprises a first insulating member 30. Along the axial X, at least part of the first insulating member 30 is arranged between the groove 111 and the first area 211, and connects the groove 111 and the first area 211. The first insulating member 30 has a larger area, which is conducive to dispersing the pressure of the groove 111 to the electrode assembly 20, and reducing the problem of excessive concentration of pressure to the electrode assembly 20.

[0063] In one or more embodiments, along the axial X, the first insulating member 30 is arranged between the protrusion 41 and the electrode assembly 20, and connects the protrusion 41 and the electrode assembly 20, forming insulation between the protrusion 41 and the electrode assembly 20. The protrusion 41 and the groove 111 both press the first area 211 of the electrode assembly 20 through the first insulating member 30, which is conducive to making the stress of the first area 211 more uniform.

[0064] In one or more embodiments, the surface of the protrusion 41 is provided with an insulating layer (not shown), which is pressed against the electrode assembly 20 to form an insulating connection between the protrusion 41 and the electrode assembly 20. In one or more embodiments, the insulating layer can be a high polymer layer coated on the surface of the protrusion 41.

[0065] Please refer to FIG. 2, in one or more embodiments, part of the first insulating member 30 is arranged between the groove 111 and the first area 211, and the first insulating member 30 has a larger area, which is conducive to dispersing the pressure to the electrode assembly 20, and reducing the problem of excessive concentration of pressure to the electrode assembly 20.

[0066] In one or more embodiments, the first insulating member 30 is entirely disposed between the groove 111 and the first region 211 (not shown), and the area of the first insulating member 30 is small, which is conducive to reducing the interference of the first insulating member 30 with other components inside the cylindrical battery 100 and facilitating the connection of the electrode assembly 20 and other components.

[0067] In one or more embodiments, the first region 211 includes a region indirectly pressed by the groove 111, the groove 111 presses against the first insulating member 30, and the first insulating member 30 presses against the first region 211. The first region 211 includes a region where the first insulating member 30 and the first end face 21 are connected.

[0068] In one or more embodiments, the second region 212 includes a region where the first insulating member 30 and the first end face 21 are not connected. In the axial direction X, the projection of the first insulating member 30 is connected to the projection of the second region 212 of the first end face 21, which is conducive to reducing the interference of the first insulating member 30 with other components inside the cylindrical battery 100, such as the current collector, and facilitating the connection of the current collector and the electrode assembly.

[0069] In the radial direction Y, the second region 212 is connected to the first region 211 and extends to the center hole 22 of the electrode assembly 20.

[0070] FIG. 3 is an enlarged view of A in FIG. 2. As shown in FIG. 3, the first insulating member 30 includes a first surface 30A and a second surface 30B, the first surface 30A is closer to the first region 211 than the second surface 30B, and the thickness between the first surface 30A and the second surface 30B of the first insulating member 30 is H3.

[0071] The measurement steps of H3 are as follows:

[0072] The measurement steps of the thickness H3 of the first insulating member 30 include: taking out the first insulating member 30 from the shell 10 of the cylindrical battery 100, flattening the first insulating member 30, and the outer edge 311 and the inner edge 312 of the first insulating member 30 in the flattened state (not shown) are substantially in the same plane. Randomly select different 10 regions on the surface of the first insulating member 30, measure the thickness of the 10 regions by a height gauge, and take the average value to obtain the thickness H3 of the first insulating member 30.

[0073] In one or more embodiments, the degree of depression of the first region 211 can be adjusted according to the working conditions of the cylindrical battery 100.

[0074] In one or more embodiments, 0.5H3≤ H2-H1≤ 2H3, for example, H2-H1 can be: 0.5H3, 0.6H3, 0.7H3, 0.8H3, 0.9H3, 1H3, 1.1H3, 1.2H3, 1.3H3, 1.4H3, 1.5H3, 1.6H3, 1.7H3, 1.8H3, 1.9H3, 2H3, or a range between any two of the foregoing values, which is conducive to suppressing the movement of the electrode assembly 20.

[0075] In one or more embodiments, the first region 211 is pressed to a moderate distance, H3≤ H2-H1≤ 1.5H3. Pressing the first region 211 to a moderate distance, H2-H1≤ 1.5H3, compared to pressing the first region 211 to a greater distance, is conducive to reducing the pressure on the separator in the electrode assembly 20, thereby improving the safety of the separator in the electrode assembly 20. H3≤ H2-H1, compared to pressing the first region 211 to a smaller distance, is conducive to suppressing the movement of the electrode assembly 20.

[0076] The first insulating member 30 provides cushioning and insulation between the electrode assembly 20 and the groove 111. In one or more embodiments, 0.4mm≤ H3≤ 0.8mm. For example, H3 can be: 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, or a range between any two of the foregoing values. For harsher use conditions, a larger thickness of the first insulating member 30 is selected, which is conducive to improving the safety of the cylindrical battery 100. For more stable use conditions, a smaller thickness of the first insulating member 30 is selected, which is conducive to reducing the space occupied by the first insulating member 30 and improving the volumetric energy density of the cylindrical battery 100.

[0077] In one or more embodiments, 38.2mm≤ H1≤ 127.4mm. For example, H1 can be: 38.2mm, 40mm, 45mm, 48.2mm, 48.4mm, 48.6mm, 48.8mm, 50mm, 55mm, 60mm, 65mm, 70mm, 72.8mm, 73.1mm, 73.4mm, 73.7mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 112.4mm, 112.8mm, 113.2mm, 113.6mm, 115mm, 120mm, 125mm, 127mm, 127.4mm, or a range between any two of the foregoing values.

[0078] In one or more embodiments, 39 mm < H2< 129 mm. For example, H2may be: 39 mm, 40 mm, 45 mm, 49 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 74 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 105 mm, 110 mm, 114 mm, 115 mm, 120 mm, 125 mm, 129 mm, or a range between any two of these values.

[0079] Fig. 4 is a schematic view of the structure of the first insulating member 30 of a cylindrical battery 100 according to an embodiment of the present application. As shown in Figs. 2 and 4, in one or more embodiments, the first insulating member 30 is a ring-shaped sheet 31, and the groove 111 is a ring-shaped groove, but the present application is not limited thereto. In one or more embodiments, the first region 211 is a ring-shaped first region. The ring-shaped groove presses the ring-shaped sheet 31, and the ring-shaped sheet 31 presses the ring-shaped first region. As viewed along the axis X, the ring-shaped groove has a closed ring shape, and the pressure on the electrode assembly 20 is relatively uniform. Pressing the electrode assembly 20 around the axis L0 for one turn is advantageous for improving the stability of the pressing of the electrode assembly 20 by the groove 111.

[0080] As shown in Figs. 1 and 3, the first surface 30A and the first plane P1 intersect at a first intersection line L1, and the angle between the first intersection line L1 and a second plane P2 perpendicular to the axis is a1.

[0081] Measurement of a1:

[0082] The cylindrical battery 100 is scanned by an industrial CT (Zeiss Xradia 620 Versa), and a three-dimensional image is displayed. A cross section is made on the first plane P1, and the angle between the first intersection line L1 and the second plane P2 is measured. A cross section is randomly made on a plane containing the axis L0 along the circumference of the cylindrical battery 100, and the angle between the first intersection line L1 and the second plane P2 is measured. Ten measurement values are obtained, and the average value is taken as a1.

[0083] In one or more embodiments, 5° < a1< 20°. For example, a1may be: 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, or a range between any two of these values. The extrusion of the ring-shaped sheet 31 makes it have a certain angle with the second plane P2 perpendicular to the axis L0, which is advantageous for improving the pressing effect of the electrode assembly 20 by the groove 111 and reducing the risk of movement of the electrode assembly 20.

[0084] In one or more embodiments, the first surface 30A is attached to the first region 211.

[0085] For more severe use conditions, α1 is extruded to a larger angle, so as to improve the compaction effect of the electrode assembly 20 in the shell 10.

[0086] In one or more embodiments, the material of the first insulating member 30 includes at least one of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate, or polybutylene terephthalate. The first insulating member 30 adopts the above-mentioned material, which is conducive to providing good insulation and cushioning performance.

[0087] Fig. 4 is a structural schematic diagram of a first insulating member of a cylindrical battery according to an embodiment of the present application. Please refer to Figs. 2 and 4, in one or more embodiments, the outer edge 311 of the annular sheet 31 is closer to the bottom wall 12 than the inner edge 312, and the inner edge 312 of the annular sheet 31 is inclined away from the bottom wall 12. The annular sheet 31 is closely attached to the first area 211 of the electrode assembly 20, which is conducive to the recess 111 pressing against the electrode assembly 20 and reducing the risk of the electrode assembly 20 moving.

[0088] In the embodiment in which the outer edge 311 of the annular sheet 31 is closer to the bottom wall 12 than the inner edge 312, the recess 111 is pressed against the outer edge 311 of the annular sheet 31, and the overall area of the annular sheet 31 is large, which is conducive to dispersing the pressure on the electrode assembly 20 and reducing the problem of excessive concentration of pressure applied to the electrode assembly 20.

[0089] In one or more embodiments, the recess 111 is pressed against the inner edge 312 (not shown) of the annular sheet 31, and the outer edge 311 of the annular sheet 31 is farther away from the bottom wall 12 than the inner edge 312. The overall area of the annular sheet 31 is small, which is conducive to reducing the interference of the first insulating member 30 with other components inside the cylindrical battery 100 and facilitating the connection of the electrode assembly 20 and other components (such as the current collector plate).

[0090] Second insulating member

[0091] Please refer to Figs. 2 and 3, in one or more embodiments, a second insulating member 50 is further included; the second insulating member 50 includes a first part 51, and along the axial direction X, the protrusion 41, the first part 51, the first insulating member 30, and the first area 211 are arranged in sequence, and the first part 51 connects the protrusion 41 and the first insulating member 30. The first part 51 and the first insulating member 30 are both arranged between the protrusion 41 and the first area 211, which is conducive to improving the insulation effect between the protrusion 41 and the first area 211.

[0092] Please refer to Fig. 3, in one or more embodiments, the second insulating member 50 further includes a second part 52, the second part 52 is connected with the first part 51, at least part of the second part 52 is arranged between the shell 10 and the end cover 40 and is connected with the shell 10 and the end cover 40 respectively, so as to facilitate the insulated connection of the shell 10 and the end cover 40.

[0093] housing

[0094] Figure 5 is a schematic diagram of a partial structure of a cylindrical battery housing according to an embodiment of the present application. As shown in Figure 5, in one or more embodiments, the material of the housing 10 can be metal, and correspondingly, the material of the groove 111 can also be metal. In one or more embodiments, the material of the housing 10 can be steel or aluminum, etc.

[0095] The groove 111 is made of metal, so that the groove 111 has a certain strength, and the first region 211 of the electrode assembly 20 is pressed down strongly, so that the first region 211 is stably compressed toward the bottom wall 12 compared to the second region 212, and the electrode assembly 20 is compressed between the groove 111 and the bottom wall 12, which is conducive to reducing the probability of the electrode assembly 20 moving inside the housing 10 in a bumpy environment.

[0096] In one or more embodiments, an insulating layer (not shown) is provided between the groove 111 and the electrode assembly 20, and the insulating layer is arranged on the inner surface of the groove 111, so that the groove 111 has high strength while having good insulation performance.

[0097] In one or more embodiments, the insulating layer is formed by a surface spraying process. In one or more embodiments, an AI2O3-Cr2O3 composite oxide ceramic coating is formed on the inner surface of the groove 111, and the coating has good electrical insulation performance, which is conducive to the insulation connection between the first end surface 21 and the groove 111.

[0098] The inventor realizes that, compared with large-size cylindrical batteries, the electrode assembly of a small-size cylindrical battery accounts for a small proportion of the overall weight of the cylindrical battery, and the weight of the electrode assembly is small and the inertia is also small. When the electrode assembly moves in a bumpy environment, the impact force of the electrode assembly on the internal structure of the battery housing is also small.

[0099] The inventor realizes that, for large-size batteries, the electrode assembly accounts for a large proportion of the overall weight of the cylindrical battery, and the weight of the electrode assembly is large and the inertia is also large. When the electrode assembly moves in a bumpy environment, the internal structure of the battery housing is repeatedly impacted by the electrode assembly, and compared with small-size batteries, the internal structure is more likely to fatigue and break.

[0100] In the scheme of compacting the electrode assembly 20 by the groove 111, the specific shape of the groove 111 is not specifically limited,

[0101] In combination with FIG. 2 and FIG. 5, in one or more embodiments, the groove 111 comprises a first groove side wall 112, a groove bottom wall 113 and a second groove side wall 114 connected in sequence, the first groove side wall 112 is closer to the bottom wall 12 than the second groove side wall 114. In one or more embodiments, the groove bottom wall 113 connects the first groove side wall 112 and the second groove side wall 114. In one or more embodiments, the first groove side wall 112 and the second groove side wall 114 both exert pressure on the electrode assembly 20, which is conducive to providing a more stable downward pressure structure for the electrode assembly 20.

[0102] Please refer to FIG. 5, in one or more embodiments, the first groove side wall 112 comprises a third surface 112A and a fourth surface 112B, the third surface 112A is farther away from the second groove side wall 114 than the fourth surface 112B, and the third surface 112A and the first plane P1 intersect at a second intersection line L2; the second groove side wall 114 comprises a fifth surface 114A and a sixth surface 114B, the fifth surface 114A is farther away from the first groove side wall 112 than the sixth surface 114B, and the fifth surface 114A and the first plane P1 intersect at a third intersection line L3; the included angle between the second intersection line L2 and the side wall connected with the first groove side wall 112 is α2, 60°≤α2≤70°, for example, α2 can be: 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70° or a range formed by any two values therebetween. By designing the downward pressure angle of the first groove side wall 112 relative to the side wall, it is conducive to improving the compaction effect of the groove on the electrode assembly and inhibiting the movement of the electrode assembly.

[0103] In one or more embodiments, the included angle between the third intersection line L3 and the side wall connected with the second groove side wall 114 is α3, 85°≤α3≤100°, for example, α3 can be: 85°, 86°, 87°, 88°, 89°, 90°, 91°, 92°, 93°, 94°, 95°, 96°, 97°, 98°, 99°, 100° or a range formed by any two values therebetween. By designing the downward pressure angle of the second groove side wall 114 relative to the side wall, it is conducive to improving the compaction effect of the groove on the electrode assembly and inhibiting the movement of the electrode assembly.

[0104] Measurement steps of α2 and α3:

[0105] The cylindrical battery 100 is scanned by industrial CT (Zeiss Xradia 620 Versa), displayed in the form of a three-dimensional image, and the cross section is made in the first plane P1, the angle between the second intersection line L2 and the side wall connected with the first groove side wall 112 is measured, the cross section is randomly made in the plane containing the axis L0 along the circumference of the cylindrical battery 100, the angle between the second intersection line L2 and the side wall connected with the first groove side wall 112 is measured, 10 measurement values are obtained, and the average value is taken as a2.

[0106] The testing method of the angle a3 between the third intersection line L3 and the side wall connected with the second groove side wall 114 is the same as a2, which will not be described here.

[0107] In one or more embodiments, the groove 111 is a closed annular, for example, the groove 111 includes an annular groove arranged around the side wall 11. Correspondingly, the first region 211 is an annular region.

[0108] In one or more embodiments, the groove 111 is at least two (not shown), for example, at least two grooves 111 are distributed around the side wall 11. Correspondingly, the first region 211 includes a plurality of sub-regions spaced around the axis L0.

[0109] Please refer to FIG. 5, in one or more embodiments, the shell 10 further includes a top wall 14, which is formed by inwardly folding the side wall 11, in one or more embodiments, the top wall 14 presses the groove 111 in the axial direction X, forming a pressing force on the groove 111, so that the groove 111 extrudes the first region 211 of the electrode assembly 20, further improving the structural stability of the groove 111, and being beneficial to reduce the risk of electrode assembly 20 movement.

[0110] The measurement steps of D1 are as follows:

[0111] Please refer to FIG. 5, in the first plane P1 containing the axis L0, the groove 111 includes a fifth end 111a close to the axis L0, and the internal components such as the electrode assembly 20 in the shell 10 are taken out.

[0112] Around the axis L0 of the shell 10, 10 different first planes are uniformly taken, the distance from the fifth end 111a to the outer surface of the side wall 11 is measured along the radial direction Y of the cylindrical battery 100 by using a vernier caliper, 10 measurement values are obtained, and the average value is taken as the depth D1 of the groove 111.

[0113] In one or more embodiments, 2mm≤D1≤4mm, for example, D1 can be: 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm or any two values ​​in between, which is beneficial to improve the compaction effect of the groove 111 on the electrode assembly 20 and suppress the movement of the electrode assembly 20.

[0114] In this application, the width of the annular piece 31 is D2 along the radial direction Y of the cylindrical battery 100.

[0115] The measurement steps for D2 are as follows:

[0116] An annular piece 31 is removed from the casing 10 of the cylindrical battery 100 and flattened. In the flattened state (not shown), the outer edge 311 and inner edge 312 of the annular piece 31 are approximately in the same plane. Using a Keyence IM 8000 tester, 20 points are evenly selected around the outer edge 311 of the flattened annular piece 31. A center is fitted to these 20 points. The center is then connected to each of the 20 points on the outer edge 311, forming 20 lines. These 20 lines are extended to intersect the inner edge 312 of the flattened annular piece at 20 points. The widths of the intersection points of the outer edge 311 and the inner edge 312 along these 20 lines are measured, and the average value is taken to obtain the width D2 of the annular piece 31.

[0117] In one or more embodiments, 2≤D2 / D1≤3. For example, D2 / D1 can be 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3 or any two values ​​in between. This helps to distribute the pressure on the electrode assembly 20 and reduce the problem of excessively concentrated pressure on the electrode assembly 20.

[0118] In one or more embodiments, 4≤D2≤10. For example, D2 can be 4, 5, 6, 7, 8, 9, 10 or any two values ​​in between. This helps to distribute the pressure on the electrode assembly 20 and reduce the problem of excessively concentrated pressure on the electrode assembly 20.

[0119] Electrode assembly

[0120] In one or more embodiments, the electrode assembly 20 employs a multi-tab wound structure (not shown). The multi-tab wound structure includes a first electrode, a second electrode, and a diaphragm.

[0121] The first electrode, separator, and second electrode are stacked sequentially and wound together. The first electrode includes a first current collector and a first active coating. The first current collector includes a first coating area and a first empty foil area. The first active coating is disposed in the first coating area. In the winding structure, the portion of the first empty foil area away from the first coating area is flattened to form a first flattened area. The first flattened area serves as the first multi-tab electrode, and the first multi-tab electrode forms a first end face 21 away from the bottom wall 12. Normally, the first multi-tab electrode is in a fluffy state. When the cylindrical battery 100 is in a vibrating environment, the first multi-tab electrode will gradually be compacted from a fluffy state, thus reducing its thickness. This makes the electrode assembly 20 prone to movement within the housing 10 after repeated bumping. In this example, the first region 211 corresponding to the first multi-tab electrode is compacted. Therefore, when the cylindrical battery 100 is in a bumpy environment, it helps to improve the stability of the electrode assembly 20 within the housing 10.

[0122] In one or more embodiments, the second electrode includes a second current collector and a second active coating. The second current collector includes a second coating area and a second empty foil area. The second active coating is disposed in the second coating area. The portion of the second empty foil area away from the second coating area is flattened to form a second flattened area. The second flattened area serves as a second multi-tab electrode. The arrangement of the multi-tab electrode is beneficial to reducing the internal resistance of the cylindrical battery 100.

[0123] Battery Pack Example

[0124] Figure 6 is a schematic diagram of the structure of the battery pack provided in the embodiment of this application. As shown in Figure 6, in a second aspect, this application provides a battery pack 200, including the cylindrical battery 100 in the above embodiment.

[0125] In one or more embodiments, there is one cylindrical battery 100. In one or more embodiments, as shown in FIG6, there are multiple cylindrical batteries 100, which are connected in series or in parallel, or in a combination of series and parallel connections.

[0126] In one or more embodiments, as shown in FIG6, the battery pack 200 includes a battery pack housing 201, and at least one cylindrical battery 100 is disposed within the battery pack housing 201.

[0127] Example of electrical equipment

[0128] Figure 7 is a structural schematic diagram of the first type of electrical device provided in the embodiment of this application. As shown in Figure 7, in a third aspect, this application provides an electrical device 300, which includes the battery pack 200 in the above embodiment, and the battery pack 200 includes the cylindrical battery 100 in the above embodiment.

[0129] Figure 8 is a schematic diagram of the structure of a second type of electrical device provided in the embodiment of this application. As shown in Figure 8, unlike the electrical device 300 mentioned above which includes a battery pack 200, in this embodiment, the electrical device 300 includes the cylindrical battery 100 in the above embodiment.

[0130] This application does not specifically limit the electrical equipment used, but includes electrical equipment known in the prior art. For example, electrical equipment includes, but is not limited to, computers, smartphones, backup power supplies, two-wheeled vehicles, drones, power tools, energy storage devices, etc.

[0131] Example

[0132] The embodiments and comparative examples provided below illustrate the implementation of this application in more detail. Various tests and evaluations were conducted according to the methods described below.

[0133] Test equipment:

[0134] Octahedral roller: The inner diameter of the roller is 230mm, the length is 230mm, and the wall thickness is 10mm.

[0135] Roller test method:

[0136] Cylindrical batteries were subjected to an octahedral roller test at a speed of 66 revolutions per minute for 100 minutes. The resistance and terminal voltage of the cylindrical batteries before and after the test were compared.

[0137] The criteria for passing the drum test are: the change in battery terminal voltage before and after the test is within 100mV, and the change in battery resistance is within 20%. The criteria for failing the test are: the change in battery terminal voltage before and after the test is greater than 100mV, or the change in battery resistance is greater than 20%.

[0138] The battery terminal voltage can be tested using a battery tester (model: Neware CT-4016-5V-100A), and the battery resistance can be tested using an internal resistance tester (model: HIOKI BT3563).

[0139] To verify the shock resistance of the cylindrical battery in this application, 12 sets of example tests and 3 sets of comparative tests were conducted, as follows:

[0140] In each set of embodiments, there are 12 cylindrical batteries. Each cylindrical battery is provided with a groove and electrode assembly with an interference fit as described in this application, where H2 > H1. The specific dimensions of the cylindrical batteries in each set of embodiments are shown in Table 1.

[0141] Each comparative example contains 12 cylindrical batteries, with H1 = H2 for each cylindrical battery. The specific dimensions of the cylindrical batteries in each comparative example are shown in Table 1.

[0142] Each of the aforementioned examples and comparative examples was subjected to a roller test. After the examples and comparative examples completed the test, the number of cylindrical batteries that passed the test (Q1) and the number of cylindrical batteries that failed the test (Q2) were counted in each test group. Q1 + Q2 = 12, as shown in Table 1.

[0143] Remark:

[0144] D is the diameter of the cylindrical battery;

[0145] L is the length of the cylindrical battery;

[0146] H1 is the distance from the first region to the bottom wall;

[0147] H2 is the distance of the second region from the bottom wall;

[0148] H3 is the thickness of the first insulating component;

[0149] α1 is the angle between the first line of intersection and the second plane;

[0150] α2 is the angle between the second intersection line and the sidewall connecting the first groove sidewall;

[0151] α3 is the angle between the third intersection line and the sidewall connecting the second groove sidewall;

[0152] D1 is the depth of the groove;

[0153] D2 is the width of the annular piece;

[0154] Q1 represents the number of cylindrical batteries tested in each set of examples and comparative examples.

[0155] As shown in Table 1, in Examples 1 to 12, all 12 cylindrical batteries in each of the 12 sets of examples in Table 1 passed the tumbling test.

[0156] In Comparative Examples 1 to 3, among the three sets of comparative examples in Table 1 above, 10 out of the 12 cylindrical batteries in each set passed the tumbling test, while 2 cylindrical batteries failed the tumbling test.

[0157] The pass rate of the cylindrical battery roller test in the embodiments of this solution is greater than that in the comparative cylindrical battery roller test. The roller test can verify that the cylindrical battery in the embodiments of this application has better drop resistance and shock resistance.

[0158] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A cylindrical battery, characterized by comprising: The cylindrical battery comprises: a shell comprising a side wall and a bottom wall, the side wall and the bottom wall forming an accommodation space, the side wall comprising a groove recessed towards an axis of the cylindrical battery; an electrode assembly arranged in the accommodation space, the electrode assembly and the bottom wall being arranged along an axial direction of the cylindrical battery, the electrode assembly having a first end face away from the bottom wall, the first end face being insulatedly connected with the groove; the first end face comprises a first region and a second region, the second region being closer to the axis than the first region along the axial direction, a projection of the groove and a projection of the first region overlap, and the projection of the groove and a projection of the second region are separate; along the axial direction, a distance between the first region and the bottom wall is H1, and a distance between the second region and the bottom wall is H2, H2>H1.

2. The cylindrical battery according to claim 1, characterized by, Further comprising: a first insulating member, at least a part of the first insulating member being arranged between the groove and the first region along the axial direction and connecting the groove and the first region.

3. The cylindrical battery according to claim 2, wherein along the axial direction, a projection of the first insulating member and a projection of the second region are connected.

4. The cylindrical battery according to claim 2 or 3, wherein a thickness of the first insulating member is H3, 0.5H3≤H2-H1≤2H3.

5. The cylindrical battery according to claim 4, wherein H3≤H2-H1≤1.5H3.

6. The cylindrical battery according to any one of claims 2 to 5, wherein 0.4mm≤H3≤0.8mm.

7. The cylindrical battery according to any one of claims 2 to 6, wherein the first insulating member is an annular sheet comprising an outer edge away from the axis and an inner edge close to the axis, the outer edge being closer to the bottom wall than the inner edge.

8. The cylindrical battery according to claim 7, wherein the first insulating member comprises a first surface and a second surface, the first surface being closer to the first region than the second surface; the first surface and a first plane intersect at a first intersection line, wherein the first plane is a plane containing the axis; an included angle between the first intersection line and a second plane perpendicular to the axis is a1, 5°≤a1≤20°.

9. The cylindrical battery according to any one of claims 2 to 8, wherein the first region is a region where the first insulating member and the first end face are connected; along a radial direction of the cylindrical battery, the second region is connected with the first region and extends to a central hole of the electrode assembly.

10. The cylindrical battery according to any one of claims 2 to 9, wherein a material of the first insulating member comprises at least one of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate or polybutylene terephthalate.

11. The cylindrical battery according to any one of claims 1 to 10, wherein the groove comprises a first groove side wall, a groove bottom wall and a second groove side wall connected in sequence, the first groove side wall being closer to the bottom wall than the second groove side wall. The first groove side wall comprises a third surface and a fourth surface, the third surface is farther away from the second groove side wall than the fourth surface, the third surface and a first plane intersect at a second intersection line, wherein the first plane is a plane containing the axis; The second groove side wall comprises a fifth surface and a sixth surface, the fifth surface is farther away from the first groove side wall than the sixth surface, the fifth surface and a first plane intersect at a third intersection line; An included angle between the second intersection line and the side wall connected with the first groove side wall is α2, 60°≤α2≤70°; and / or, An included angle between the third intersection line and the side wall connected with the second groove side wall is α3, 85°≤α3≤100°.

12. The cylindrical battery according to any one of claims 1 to 11, wherein, A depth of the groove is D1 in a radial direction of the cylindrical battery, 2mm≤D1≤4mm.

13. The cylindrical battery according to claim 12, wherein, The first insulating member is a ring-shaped sheet, a width of the ring-shaped sheet is D2, 2≤D2 / D1≤3.

14. The cylindrical battery according to any one of claims 2 to 13, characterized by, Further comprising: an end cover arranged along the axial direction with the electrode assembly; the end cover is provided with a protrusion, the protrusion extends towards the electrode assembly; in the axial direction, the first insulating member is arranged between the protrusion and the first region, and connects the protrusion and the first region.

15. The cylindrical battery of claim 14, wherein, Further comprising: a second insulating member; the second insulating member comprises a first part, in the axial direction, the protrusion, the first part, the first insulating member and the first region are arranged in sequence, and the first part connects the protrusion and the first insulating member.

16. The cylindrical battery according to any one of claims 1 to 15, wherein, a diameter of the cylindrical battery is D, 30mm≤D≤100mm; and / or, a length of the cylindrical battery is L, 45mm≤L≤135mm.

17. A battery pack, characterized by including: the cylindrical battery according to any one of claims 1 to 16.

18. An electrical device, comprising: including: the battery pack according to claim 17 or the cylindrical battery according to any one of claims 1 to 16.

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