Secondary battery and electronic device

Abstract

The utility model provides a secondary battery which comprises a shell which comprises an end wall, and the end wall is provided with a first pole assembling hole; the pole comprises a columnar part and an outer flange, the columnar part penetrates through the first pole assembly hole, and the outer flange is connected with the end, located outside the shell, of the columnar part; the sealing ring surrounds the columnar part and is arranged between the end wall and the outer flange; wherein the sealing ring in the compressed state is provided with a first part and a straight part, the first part corresponds to the hole edge, facing the outer flange, of the first pole assembly hole, the straight part is connected with the first part and is far away from the first part in the radial direction of the columnar part, and the compression ratio of the first part is smaller than that of the straight part. The utility model aims to provide a secondary battery and an electronic device so as to avoid sealing failure caused by the fact that a sealing ring is cut apart.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of secondary batteries and electronic devices. BACKGROUND

[0002] In the field of new energy power battery, the application of secondary battery is more and more widely, such as secondary battery (for example, lithium ion battery) can be applied to car, energy storage, mobile phone, tablet computer, wearable device, mobile power supply, electronic cigarette, digital product, electric tool, power device, energy storage device and other electronic devices. SUMMARY

[0003] In view of the problems in the related art, the utility model aims to provide a secondary battery and an electronic device to at least avoid the sealing ring being split, causing sealing failure.

[0004] To achieve the above object, the utility model provides a kind of secondary battery, comprising: shell, shell includes end wall, end wall has first pole assembly hole;Pole, including columnar portion and outer flange, columnar portion passes through first pole assembly hole, outer flange is connected with the one end of columnar portion located outside shell;Sealing ring, around columnar portion and set between end wall and outer flange;Wherein, the sealing ring of compression state has the first part corresponding with the hole edge of first pole assembly hole towards outer flange, and the flat portion connected with the first part and in the radial direction of columnar portion away from the first part, wherein the compression rate of first part is less than the compression rate of flat portion.

[0005] In some embodiments, in the axial direction of pole, the surface of outer flange facing sealing ring is provided with groove at the position corresponding with hole edge.

[0006] In some embodiments, the height H4 of groove along the axial direction of columnar portion is in the range of 0.05mm-0.4mm, and the width W4 of groove along the radial direction of columnar portion is in the range of 0.1mm-0.8mm.

[0007] In some embodiments, the hole edge is chamfered.

[0008] In some embodiments, the chamfer is bevel, and the width W1 of bevel along the radial direction of columnar portion is in the range of 0.05mm-0.4mm, and the height H1 of bevel along the axial direction of columnar portion is in the range of 0.05mm-0.4mm.

[0009] In some embodiments, the chamfer is round, and the radius R of round is in the range of 0.05mm-0.4mm.

[0010] In some embodiments, the sealing ring is provided with a second groove at the first portion, and the height H3 of the uncompressed second groove in the axial direction of the columnar portion is in the range of 0.05mm-0.8mm.

[0011] In some embodiments, the second groove is an annular structure around the axis of the sealing ring, and the width W3 of the uncompressed second groove in the radial direction is in the range of 0.1mm-0.8mm.

[0012] In some embodiments, along the radial direction of the columnar portion, the second groove in the compressed state is close to the spacing J5>0 between the side wall of the columnar portion and the hole edge.

[0013] In some embodiments, the second groove has at least a part of the orthographic projection on the surface of the end wall away from the outer flange covering the hole edge.

[0014] Embodiments of the present application also provide an electronic device comprising the secondary battery of any one of the above.

[0015] The beneficial technical effects of the present application are as follows:

[0016] The compression rate of the first portion of the present application embodiment is less than that of the flat portion, which at least avoids the sealing ring being cut and causing sealing failure. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 A schematic diagram showing that the sealing ring of the prior art is cut.

[0019] Figure 2 A schematic diagram showing that the electronic device of the present application embodiment is a vehicle.

[0020] Figure 3 A three-dimensional schematic diagram of the secondary battery according to the present application embodiment is shown.

[0021] Figure 4 A top view schematic diagram of the secondary battery according to an embodiment of the present application is shown.

[0022] Figure 5 A part of the section schematic diagram of AA section is shown. Figure 4

[0023] Figure 6 A three-dimensional schematic diagram of the secondary battery according to the present application embodiment is shown.​Figure 5 An enlarged schematic view of region B.

[0024] Figure 7 A top view of a housing is shown according to embodiments of the present application.

[0025] Figure 8 A top view of a housing is shown according to embodiments of the present application. Figure 7 A partial cross-sectional view of cross-section CC is shown.

[0026] Figure 9 A top view of a housing is shown according to embodiments of the present application. Figure 8 An enlarged schematic view of region D.

[0027] Figure 10 A top view of a housing is shown according to embodiments of the present application.

[0028] Figure 11 A top view of a housing is shown according to embodiments of the present application. Figure 10 An enlarged schematic view of region F.

[0029] Figure 12 A top view of a housing is shown according to embodiments of the present application.

[0030] Figure 13 A top view of a housing is shown according to embodiments of the present application. Figure 12 A partial cross-sectional view of cross-section GG is shown.

[0031] Figure 14 A top view of a housing is shown according to embodiments of the present application. Figure 13 An enlarged schematic view of region H.

[0032] Figure 14A A top view of a housing is shown according to embodiments of the present application. Figure 14 An enlarged schematic view of region μ.

[0033] Figure 15 A top view of a housing is shown according to embodiments of the present application.

[0034] Figure 16 A top view of a housing is shown according to embodiments of the present application. Figure 15 A cross-sectional view of cross-section II is shown.

[0035] Figure 17 A top view of a housing is shown according to embodiments of the present application.

[0036] Figure 18 A top view of a housing is shown according to embodiments of the present application. Figure 17 A cross-sectional view of cross-section JJ is shown.

[0037] Figure 19 A top view of a housing is shown according to embodiments of the present application.

[0038] Figure 20 A top view of a housing is shown according to embodiments of the present application. Figure 19Partial cross-sectional view of a middle KK section.

[0039] Figure 21 An enlarged view of a middle L region is shown. Figure 20 An enlarged view of a middle L region is shown.

[0040] Figure 22 An enlarged view of a middle L region is shown. Figure 21 An enlarged view of a middle L region is shown. DETAILED DESCRIPTION

[0041] For better understanding of the spirit of the embodiments of the present application, the following further describes the same in conjunction with some preferred embodiments of the present application.

[0042] Embodiments of the present application will be described in detail below. Throughout the specification, the same or similar components and components having the same or similar functions are denoted by like reference numerals. The embodiments described herein with reference to the accompanying drawings are illustrative in nature, diagrammatic in nature, and serve to provide a basic understanding of the present application. The embodiments of the present application should not be construed as limiting the present application.

[0043] As used herein, the terms "approximately," "substantially," "about," and "generally" are used to describe and account for small variations. When used in connection with an event or circumstance, the terms can refer to instances in which the event or circumstance occurs exactly, and instances in which the event or circumstance occurs approximately or nearly.

[0044] In this specification, relative terms such as "central," "longitudinal," "lateral," "forward," "rearward," "rightward," "leftward," "internal," "external," "lower," "higher," "horizontal," "vertical," "above," "below," "top," "bottom," and derivatives thereof (e.g., "horizontally," "downwardly," "upwardly," etc.) should be construed to refer to the orientation as then described or as shown in the drawing under discussion. These relative terms are for convenience of description only and do not require that the application be practiced with the particular orientation described or shown.

[0045] For ease of description, "first," "second," "third," etc. can be used herein to distinguish between different components of a figure or series of figures. The "first," "second," "third," etc. are not intended to describe corresponding components.

[0046] Figure 1 An enlarged view of a middle L region is shown. Figure 1, the first pole post assembly hole of the secondary battery is punched from the inside to the outside of the secondary battery, burrs are easily formed at the hole edges at the top of the first pole post assembly hole during the punching process, and the sealing ring is cut by the burrs during the subsequent riveting process, Figure 1 A slight cutting mark 2 is shown on the sealing ring 1 of the prior art that is cut by the burrs.

[0047] The electronic device 1000 can include a battery pack, a battery pack 1002, an electric vehicle, an energy storage cabinet, etc. Figure 2 The electronic device of the embodiment of the present application is shown as a schematic diagram of a vehicle, as shown in Figure 2 The battery pack 1002 can be arranged at the bottom, head or tail of the vehicle body 1001. The battery pack 1002 can be used for power supply of the vehicle, for example, the battery pack 1002 can be used as the operating power supply of the vehicle. The working part of the electronic device 1000 is electrically connected with the battery pack 1002 to obtain electric energy support. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or an extended range automobile, but is not limited thereto. The working part is the vehicle body, the battery pack 1002 is arranged at the bottom of the vehicle body, and provides electric energy support for the running of the vehicle or the operation of the electrical elements in the vehicle. However, in some other embodiments, the electronic device 1000 can also be a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The working part can obtain electric energy from the battery pack 1002, and make corresponding working unit parts, such as the fan blade rotating unit, the dust suction working unit of the dust collector, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The embodiment of the present application does not specially limit the above-mentioned electronic device 1000.

[0048] Figure 3A perspective view of a secondary battery according to an embodiment of the present application is shown, Figure 4 A top view of a secondary battery according to an embodiment of the present application is shown, Figure 5 A perspective view of a secondary battery according to an embodiment of the present application is shown, Figure 4 A partial cross-sectional view of the AA profile is shown, Figure 6 A perspective view of a secondary battery according to an embodiment of the present application is shown, Figure 5 An enlarged view of the B region is shown. See Figure 3 , Figure 4 , Figure 5 A perspective view of a secondary battery according to an embodiment of the present application is shown, Figure 6 Embodiments of the present application provide a secondary battery 100, which includes a housing 200, an electrode assembly located in the housing 200, and a current collector plate, and a pole 50 assembled on the housing 200. The housing 200 includes an end wall 111 and a side wall surrounding the end wall 111. The formation of the housing 200 can be achieved in various ways as long as a stable sealing and electrical connection relationship can be formed, for example, it can be in the form of one-piece stamping, one-piece casting or separate welding. The housing 200 is formed with a receiving cavity for accommodating the electrode assembly, electrolyte, current collector plate and other necessary components of the battery. Specifically, the diameter of the housing 200 can be determined according to the specific size of the electrode assembly. The material of the housing 200 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. In order to prevent the housing 200 from rusting during long-term use, a layer of anti-rust material such as metal nickel can also be plated on the surface of the housing 200. The secondary battery 100 can be a cylindrical battery, for example, a 4680 cylindrical battery with a height of 80 mm and a diameter of 46 mm; for example, a height of 15 mm and a diameter of 46 mm.

[0049] The electrode assembly is a component in which electrochemical reactions occur in the secondary battery 100. One or more electrode assemblies can be contained within the case 200. The electrode assembly is a jelly-roll or stacked electrode assembly including a positive electrode tab including a positive electrode current collector and a positive electrode active material layer coated on the positive electrode current collector, a first separator, a negative electrode tab including a negative electrode current collector and a negative electrode active material layer coated on the negative electrode current collector, and a second separator, the positive electrode current collector having a first coated region coated with the positive electrode active material layer and a first uncoated region not coated with the positive electrode active material layer formed thereon, the first coated region and the first uncoated region being arranged in a height direction of the electrode assembly, the first uncoated region extending to outside of the separator toward one end in the height direction of the secondary battery 100 and forming a bent positive electrode tab, the second coated region coated with the negative electrode active material layer and the second uncoated region not coated with the negative electrode active material layer being formed on the negative electrode current collector, the second coated region and the second uncoated region being arranged in the height direction of the electrode assembly, the second uncoated region also extending to outside of the separator toward one end in the height direction of the secondary battery 100 and forming a bent negative electrode tab, the first separator and the second separator being disposed between the positive electrode tab and the negative electrode tab to separate the positive electrode active material layer and the negative electrode active material layer. In the case of a lithium ion secondary battery 100, the material of the positive electrode current collector can be aluminum, the positive electrode active material layer can include a positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate. The material of the negative electrode current collector can be copper, the negative electrode active material layer can include a negative electrode active material, and the negative electrode active material can be carbon or silicon. The base material of the first separator and the second separator can be polypropylene (PP) or polyethylene (PE). To protect and insulate the electrode assembly, an insulating film can be coated on the outside of the electrode assembly, and the insulating film can be synthesized from PP, PE, PET, PVC, or other high-molecular polymer materials.

[0050] In some embodiments, the end wall 111 has a first pole post assembly hole 1110, an upper plastic contacts a surface of the end wall 111 facing outside of the shell 200, and a lower plastic contacts a surface of the end wall 111 facing inside of the shell 200, the upper plastic has a second assembly hole corresponding to the first pole post assembly hole 1110, and the lower plastic has a third assembly hole corresponding to the first pole post assembly hole 1110 and the second assembly hole. In some embodiments, the pole post 50 includes an outer flange 51, a columnar portion 52, and an inner flange, the outer flange 51 is located outside of the shell 200, and the columnar portion 52 passes through the first pole post assembly hole 1110, the second assembly hole, and the third assembly hole. The outer flange 51 is connected to an end of the columnar portion 52 of the pole post 50 located outside of the shell 200, the inner flange is connected to an end of the columnar portion 52 of the pole post 50 located inside of the shell 200, and the inner flange and the end wall 111 jointly hold the lower plastic, and the outer flange 51 and the end wall 111 jointly hold the upper plastic. The inner flange of the pole post 50 contacts a surface of the lower plastic facing the electrode assembly / backing away from the end wall 111 and fixes the lower plastic to an inner side surface of the end wall 111 facing inside of the shell 200, the outer flange 51 of the pole post 50 contacts a surface of the upper plastic backing away from the end wall 111 and fixes the lower plastic to an outer side surface of the end wall 111 facing away from the inside of the shell 200, and the upper plastic and the lower plastic surround the columnar portion 52.

[0051] The secondary battery 100 includes a sealing ring 300 surrounding the columnar portion 52 and disposed between the end wall 111 and the outer flange 51, and the sealing ring 300 is compressed during a riveting process of the secondary battery 100 to seal the shell 200 of the secondary battery 100. The sealing ring 300 in the compressed state has a first portion 1111’ corresponding to a hole edge 1111 of the first pole post assembly hole 1110 facing the outer flange 51, and a flat portion 302 connected to the first portion 1111’ and away from the first portion 1111’ in a radial direction along the columnar portion 52, wherein a compression rate of the first portion 1111’ is less than a compression rate of the flat portion 302. As described above, since burrs are formed at the hole edge 1111 of the first pole post assembly hole 1110 during a stamping process of the secondary battery 100, in order to avoid the burrs after compression cutting the sealing ring 300, causing the sealing ring 300 to be subsequently cracked and resulting in a sealing failure problem, the compression rate of the first portion 1111’ of the sealing ring 300 corresponding to the hole edge 1111 can be set to be less than the compression rate of the flat portion 302 of the sealing ring 300, that is, the compression amount of the first portion 1111’ corresponding to the hole edge 1111 where the burrs are generated is less than the compression amount of the flat portion 302 of the sealing ring 300, and essentially the burrs generated at the hole edge 1111 are avoided at the first portion 1111’, so as to avoid the sealing ring 300 being cut and subsequently cracked during a use cycle of the secondary battery 100 and resulting in a sealing failure.

[0052] Specifically, referring to Figure 4 , Figure 5and Figure 6 , the hole edge 1111 can be configured as a chamfer, that is to say, by setting the hole edge 1111 between the upper surface of the end wall 111 perpendicular to the axis of the columnar portion 52 and the flat area 1112 of the hole wall of the first pole assembly hole 1110 parallel to the axis of the columnar portion 52 as a chamfer, the part of the projection of the sealing ring 300 in the compressed state falling on the hole edge 1111 set as a chamfer along the axial direction of the columnar portion 52 is the first part 1111'. And the part of the sealing ring 300 in the compressed state connected to the first part 1111' and away from the first part 1111' along the radial direction of the columnar portion 52 compared to the first part 1111' is the flat part 302. Additionally, in some embodiments, the compression rate of the first part 1111' can be less than the compression rate of the part of the sealing ring 300 in the compressed state corresponding to the flat area 1112 of the hole wall, it can be understood that, similar to the first part 1111', along the axial direction of the columnar portion, the part of the projection of the sealing ring 300 in the compressed state falling on the flat area 1112 of the hole wall is the part of the sealing ring 300 in the compressed state corresponding to the flat area 1112.

[0053] Figure 7 a top view schematic diagram of a shell according to an embodiment of the present application is shown, Figure 8 a top view schematic diagram of a shell according to an embodiment of the present application is shown, Figure 7 a partial cross-sectional schematic diagram of the CC section in the shell, Figure 9 a top view schematic diagram of a shell according to an embodiment of the present application is shown, Figure 8 a top view schematic diagram of a shell according to an embodiment of the present application is shown, Figure 7 , Figure 8 a top view schematic diagram of a shell according to an embodiment of the present application is shown, Figure 9 , the chamfer at the end of the hole wall of the first pole assembly hole 1110 facing the outer flange 51 can be an oblique angle, the width W1 of the oblique angle along the radial direction of the columnar portion 52 is in the range of 0.05mm-0.4mm, the height H1 of the oblique angle along the axial direction of the columnar portion 52 is in the range of 0.05mm-0.4mm, as a preference, W1 is in the range of 0.1mm-0.2mm, H1 is in the range of 0.1mm-0.2mm. Figure 10 a top view schematic diagram of a shell according to an embodiment of the present application is shown, Figure 11 a top view schematic diagram of a shell according to an embodiment of the present application is shown, Figure 10 a top view schematic diagram of a shell according to an embodiment of the present application is shown, Figure 10 a top view schematic diagram of a shell according to an embodiment of the present application is shown, Figure 11 , the chamfer at the end of the hole wall of the first pole assembly hole 1110 facing the outer flange 51 can be a round angle, the radius R of the round angle is in the range of 0.05mm-0.4mm, as a preference, R is in the range of 0.1mm-0.2mm.

[0054] Figure 12 a top view schematic diagram of a shell according to an embodiment of the present application is shown, Figure 13It shows Figure 12 A partial cross-sectional diagram of the GG section. Figure 14 It shows Figure 13 Enlarged schematic diagram of region H in the middle. Figure 14A It shows Figure 14 A magnified schematic diagram of the mid-μ region. See also... Figure 12 , Figure 13 , Figure 14 and Figure 14A The sealing ring 300 may have a second groove 333 at the first portion 1111'. Alternatively, when the sealing ring 300 is in a compressed state, the projection of the second groove 333 of the sealing ring 300 along the axial direction of the columnar portion 52 slightly extends beyond the sealing ring 300, that is, the portion corresponding to the hole edge 1111, which is the first portion 1111'. Similar to the aforementioned straight portion 302, the compressed sealing ring 300 has a straight portion 302 that connects to and is away from the first portion 1111' in the axial direction of the columnar portion 52. It can be understood that when the sealing ring 300 is in a compressed state, the first portion 1111' of the sealing ring 300 corresponds to the hole edge 1111 where a burr is generated. Since the compression ratio of the first portion 1111' is less than the compression ratio of the straight portion 302, the first portion 1111' corresponding to the hole edge 1111 can avoid the burr at the hole edge 1111, preventing the sealing ring 300 from being cut by the burr.

[0055] Figure 15 This diagram shows a top perspective view of a sealing ring 300 according to an embodiment of this application. Figure 16 It shows Figure 15 A schematic cross-sectional view of section II. See also Figure 15 and Figure 16 , Figure 15 and 16 An uncompressed sealing ring 300 is shown. In some embodiments, the height H3 of the second groove 333 of the uncompressed sealing ring 300 in the axial direction of the columnar portion 52 is in the range of 0.05 mm to 0.8 mm. In some embodiments, the second groove 333 is an annular structure surrounding the axis of the sealing ring 300. It can also be understood that the second groove 333 divides the sealing ring 300 into three parts, namely two protrusions and a recess connecting the two protrusions, wherein, in some embodiments, the width W3 of the uncompressed second groove 333 in the radial direction is in the range of 0.1 mm to 0.8 mm. Preferably, H3 is in the range of 0.1 mm to 0.4 mm, and W3 is in the range of 0.2 mm to 0.4 mm. Figure 17 A top perspective view of another sealing ring according to an embodiment of this application is shown. Figure 18 It shows Figure 17 A schematic cross-sectional view of section JJ. See also: Figure 17 andFigure 18 , Figure 17 and Figure 18 The sealing ring 300 in the non-compressed state also belongs to the category, the height H3 of the non-compressed second groove 333 in the axial direction of the cylindrical portion 52 is in the range of 0.05mm-0.8mm, which is the same as Figure 15 and Figure 16 The difference between the sealing ring 300 in the non-compressed state and the compressed state is that, Figure 17 and 18 The second groove 333 in the sealing ring 300 in the non-compressed state extends laterally beyond the inner ring edge of the sealing ring 300, the sealing ring 300 is divided into two parts by the second groove 333, which are distinguished by different positions and heights of the ring layer, the second groove 333 has only one side edge, and more specifically, the second groove 333 divides the sealing ring 300 into two parts, one protruding part and one recessed part connected to the protruding part. The second groove 333 divides the sealing ring 300 into a first region corresponding to the second groove 333, and a second region farther away from the cylindrical portion 52 in the radial direction of the cylindrical portion 52 than the first region, and the thickness of the sealing ring 300 in the first region is less than the thickness of the sealing ring 300 in the second region. While Figure 15 and Figure 16 The second groove 333 in the sealing ring 300 in the non-compressed state extends laterally beyond the inner ring edge of the sealing ring 300, the sealing ring 300 is divided into two parts by the second groove 333, which are distinguished by different positions and heights of the ring layer, the second groove 333 has only one side edge, and more specifically, the second groove 333 divides the sealing ring 300 into two parts, one protruding part and one recessed part connected to the protruding part. The second groove 333 divides the sealing ring 300 into a first region corresponding to the second groove 333, and a second region farther away from the cylindrical portion 52 in the radial direction of the cylindrical portion 52 than the first region, and the thickness of the sealing ring 300 in the first region is less than the thickness of the sealing ring 300 in the second region. While Figure 14 In some embodiments, the second groove 333 in the compressed state has a distance J5>0 between the side wall of the cylindrical portion 52 and the hole edge 1111 in the radial direction of the cylindrical portion 52. It can also be understood that in some embodiments, the orthographic projection of the second groove 333 on the surface of the end wall 111 facing away from the outer flange 51 covers at least a part of the hole edge 1111, that is, it can be understood that the second groove 333 is located substantially above the hole edge 1111.

[0056] Figure 19 A top view schematic diagram of another secondary battery 100 according to an embodiment of the present application is shown, Figure 20 A part cross-sectional schematic diagram of the KK cross-section in Figure 19 is shown, Figure 21 A part cross-sectional schematic diagram of the KK cross-section inFigure 20 An enlarged schematic view of the middle L region, Figure 22 is shown Figure 21 An enlarged schematic view of the middle M region. Referring to Figure 19 , Figure 20 , Figure 21 , Figure 22 The surface of the pole 50 facing the sealing ring 300 is provided with a groove 501 at a position corresponding to the hole edge 1111. Specifically, it can be understood that the part of the projection of the sealing ring 300 in the compressed state falling within the area of the groove 501 along the axial direction of the columnar portion 52 is the first part 1111', and in the compressed state, the first part 1111' of the sealing ring 300 corresponds to the hole edge 1111. It can also be understood that, similarly to the foregoing, the sealing ring 300 in the compressed state also has a flat portion 302 connected to the first part 1111' and away from the first part 1111' in the radial direction of the columnar portion 52. By making the compression rate of the first part 1111' corresponding to the hole edge 1111 where burrs occur smaller than that of the flat portion 302, the first part 1111' is avoided from the burrs at the hole edge 1111, so as to avoid the sealing ring 300 being cut and causing the sealing ring 300 to crack later, resulting in sealing failure.

[0057] In some embodiments, the height H4 of the groove 501 along the axial direction of the columnar portion 52 is in the range of 0.05mm-0.4mm, and the width W4 of the groove 501 along the radial direction of the columnar portion 52 is in the range of 0.1mm-0.8mm, preferably, W4 is in the range of 0.2mm-0.4mm, and H4 is in the range of 0.1mm-0.2mm. In some embodiments, the groove 501 is provided on the side of the outer flange 51 facing the sealing ring 300, and the orthographic projection of the groove 501 on the surface of the end wall 111 away from the outer flange 51 covers at least part of the hole edge 1111.

[0058] Embodiments of the present application also provide an electronic device 1000 comprising the secondary battery 100 of any one of the above, and the electronic device 1000 can have the beneficial effects described above with respect to the secondary battery 100.

[0059] The above only describes preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A secondary battery characterized by comprising: include: The housing includes an end wall having a first pole assembly hole; The pole post includes a columnar portion and an outer flange, the columnar portion passing through the first pole post mounting hole, and the outer flange being connected to one end of the columnar portion located outside the housing; A sealing ring surrounds the columnar portion and is disposed between the end wall and the outer flange; The sealing ring in the compressed state has a first portion corresponding to the edge of the hole of the first pole mounting hole facing the outer flange, and a straight portion connecting the first portion and moving away from the first portion in the radial direction along the columnar portion, wherein the compression ratio of the first portion is less than the compression ratio of the straight portion.

2. The secondary battery according to claim 1, characterized by In the axial direction of the pole post, a groove is provided on the surface of the outer flange facing the sealing ring at a position corresponding to the edge of the hole.

3. The secondary battery according to claim 2, characterized in that, The height H4 of the groove along the axial direction of the columnar portion is in the range of 0.05mm-0.4mm, and the width W4 of the groove along the radial direction of the columnar portion is in the range of 0.1mm-0.8mm.

4. The secondary battery according to claim 1, characterized in that, The edges of the hole are chamfered.

5. The secondary battery according to claim 4, characterized in that, The chamfer is an angled bevel, the width W1 of the angled bevel along the radial direction of the columnar part is in the range of 0.05mm-0.4mm, and the height H1 of the angled bevel along the axial direction of the columnar part is in the range of 0.05mm-0.4mm.

6. The secondary battery according to claim 4, characterized in that, The chamfer is a rounded corner, and the radius R of the rounded corner is in the range of 0.05mm-0.4mm.

7. The secondary battery according to claim 1, characterized in that, The sealing ring has a second groove at the first part, and the height H3 of the uncompressed second groove in the axial direction of the columnar part is in the range of 0.05mm-0.8mm.

8. The secondary battery according to claim 7, characterized in that, The second groove is an annular structure surrounding the axis of the sealing ring, wherein the width W3 of the uncompressed second groove in the radial direction is in the range of 0.1mm-0.8mm.

9. The secondary battery according to claim 7, characterized in that, Along the radial direction of the columnar portion, the distance J5 between the second groove in the compressed state and the sidewall of the columnar portion and the edge of the hole is greater than 0.

10. The secondary battery according to claim 7, characterized in that, The orthographic projection of the second groove onto the surface of the end wall opposite to the outer flange at least partially covers the edge of the hole.

11. An electronic device, characterized in that, Includes the secondary battery as described in any one of claims 1-10.

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