Cap assembly, battery and battery pack

Abstract

The utility model provides a cap assembly, a battery and a battery pack, the cap assembly comprises a sealing element, and the outer side surface of the sealing element is contacted with the inner surface of a shell of the lithium ion battery; the top cover is arranged on the inner side of the sealing element; the anti-explosion piece is arranged on the inner side of the sealing element, and a part of the outer surface of the anti-explosion piece is connected with a part of the outer surface of the top cover; one part of the insulating part is arranged between the sealing element and the explosion-proof sheet; and / or a part of the insulating part is arranged between the sealing element and the top cover.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a cap assembly, a battery and a battery pack. Background Art

[0002] The cap assembly in a lithium-ion battery usually includes a shell, a top cover, an explosion-proof disk and a sealing element. The sealing element can be used to seal and insulate the shell and the top cover, the shell and the explosion-proof disk, and the portion outside the welding area between the explosion-proof disk and the top cover. The shell is mostly made of hard aluminum or steel, the top cover is mostly made of hard steel, the explosion-proof disk is mostly made of hard aluminum alloy, and the sealing element is mostly made of flexible plastic material. When high pressure is generated inside the battery or the battery is subjected to external compression, the shell, the explosion-proof disk or the top cover will be deformed by the force and thus squeeze the sealing element. Since the sealing element is made of flexible material, the sealing element is easily squeezed and broken, causing the top cover to contact with a part of the shell and short-circuit, or the explosion-proof disk to contact with a part of the shell and short-circuit, thereby causing a short circuit in the battery. Utility Model Content

[0003] The embodiments of the present utility model provide a cap assembly, a battery, and a battery pack, which can improve the technical problem that the sealing ring of the cap assembly is squeezed and ruptured, thereby causing a short circuit in the battery.

[0004] In a first aspect, an embodiment of the present invention provides a cap assembly, the cap assembly comprising:

[0005] a sealing element, wherein an outer side of the sealing element contacts an inner surface of a housing of the lithium-ion battery;

[0006] a top cover, the top cover being arranged on the inner side of the sealing element;

[0007] a bursting disk, the bursting disk being disposed inside the sealing element, a portion of an outer surface of the bursting disk being connected to a portion of an outer surface of the top cover; and

[0008] an insulating member, a portion of which is disposed between the sealing element and the explosion-proof disk; and / or a portion of which is disposed between the sealing element and the top cover.

[0009] In one embodiment, the insulating member is configured as an insulating layer, and the insulating layer includes a first insulating layer provided on the explosion-proof disk, and / or the insulating layer includes a second insulating layer provided on the top cover.

[0010] In one embodiment, a first welding portion is provided on the top cover, and the first insulating layer is located in a partial area outside the first welding portion; and / or,

[0011] The explosion-proof plate is provided with a second welding portion welded to the first welding portion, and the second insulating layer is located in a partial area outside the second welding portion.

[0012] In one embodiment, the outer side wall of the top cover and the outer side wall of the explosion-proof disk are arranged close to the inner side wall of the sealing element in sequence, and the insulating member includes a first insulating layer arranged on the explosion-proof disk and a second insulating layer arranged on the top cover, and the second insulating layer and the first insulating layer are arranged on the inner side of the sealing element in sequence.

[0013] In one embodiment, the top cover includes a first outer surface and a second outer surface disposed opposite to each other, and the top cover further includes a first outer side surface disposed between the first outer surface and the second outer surface; the bursting disk includes a third outer surface and a fourth outer surface disposed opposite to each other, and the bursting disk further includes a second outer side surface disposed between the third outer surface and the fourth outer surface, wherein a portion of the second outer surface is connected to a portion of the third outer surface;

[0014] The first insulating layer includes a first portion of the first insulating layer and a second portion of the first insulating layer connected to each other, the first portion of the first insulating layer covers the second outer side surface, and the second portion of the first insulating layer covers a portion of the fourth outer surface; and / or,

[0015] The second insulating layer includes a first portion of the second insulating layer and a second portion of the second insulating layer connected to each other, the first portion of the second insulating layer covers the first outer side surface, and the second portion of the second insulating layer covers a portion of the first outer surface.

[0016] In one embodiment, the burst disk is provided with a first flange, the first flange being configured to be disposed around a portion of a first outer side surface of the top cover, the insulating member comprising a first insulating layer disposed on the burst disk and a second insulating layer disposed on the top cover; the first insulating layer being disposed on an inner side of the sealing element, and the second insulating layer being disposed on an inner side of the first flange.

[0017] In one embodiment, the first insulating layer includes a first portion of the first insulating layer, a second portion of the first insulating layer, and a third portion of the first insulating layer, which are sequentially connected, wherein the first portion of the first insulating layer covers at least a portion of the top surface of the flange, the second portion of the first insulating layer covers the first outer surface of the explosion-proof disk, and the third portion of the first insulating layer covers a portion of the fourth outer surface of the explosion-proof disk; and / or,

[0018] A second insulating layer is provided on the top cover, and the second insulating layer includes a first portion of the second insulating layer and a second portion of the second insulating layer connected in sequence, the first portion of the second insulating layer covers the second outer surface of the top cover, and the second portion of the second insulating layer covers a portion of the first outer surface of the top cover.

[0019] In one embodiment, the burst disk is provided with a second flange, the second flange is configured to surround the first outer side surface of the top cover, and the second flange is in contact with the first outer surface of the top cover, and the insulating member is configured as a first insulating layer provided on the burst disk, and the first insulating layer is provided on the inner side of the sealing element.

[0020] In one embodiment, the first insulating layer includes a first partial first insulating layer, a second partial first insulating layer, and a third partial first insulating layer connected in sequence, wherein the first partial first insulating layer covers at least a portion of the top surface of the second flange, the second partial first insulating layer covers the second outer side surface of the explosion-proof disk, and the third partial first insulating layer covers a portion of the fourth outer surface of the explosion-proof disk.

[0021] In one embodiment, the inner side surface of the sealing element includes a first inner side surface and a second inner side surface, a protrusion structure is provided between the first inner side surface and the second inner side surface, and the insulating member is provided close to the second inner side surface.

[0022] In a second aspect, an embodiment of the present invention provides a battery, wherein the battery includes the above-mentioned cap assembly, and the battery includes a cylindrical lithium-ion battery.

[0023] In a third aspect, an embodiment of the present invention provides a battery pack, which includes a plurality of batteries, and each of the batteries includes the above-mentioned cap assembly.

[0024] Beneficial effects of the embodiments of the present utility model:

[0025] In an embodiment of the present invention, an insulating member is provided inside the top cover assembly, and the insulating member can be provided between the sealing element and the explosion-proof disk, and / or the insulating member can be provided between the sealing element and the top cover, so that after the sealing element is squeezed, the insulating member can further insulate the explosion-proof disk from the shell, or the insulating member can further insulate the top cover from the shell, thereby effectively preventing the technical problem of battery short circuit caused by the rupture of the sealing element. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a three-dimensional schematic diagram of a battery provided by an embodiment of the present utility model;

[0028] Figure 2 is a cross-sectional view of the cap assembly provided in the first embodiment of the present utility model;

[0029] Figure 3 yes Figure 2 A partial enlarged view of

[0030] Figure 4 is a cross-sectional view of the cap assembly provided in the second embodiment of the present utility model;

[0031] Figure 5 yes Figure 4 A partial enlarged view of

[0032] Figure 6 is a cross-sectional view of the cap assembly provided in the third embodiment of the present utility model;

[0033] Figure 7 yes Figure 6 A partial enlarged view of

[0034] Figure Number:

[0035] 1000, battery; 10, housing;

[0036] 100. Cap assembly;

[0037] 20. Top cover; 21. Base portion; 211. First outer surface; 212. Second outer surface; 213. First outer side surface; 214. First welding portion; 22. Boss portion;

[0038] 30. Explosion-proof disk; 31. Main body; 311. Third outer surface; 312. Fourth outer surface; 313. Second outer side surface; 314. Second weld; 32. Explosion-proof portion; 321. Third weld; 33. First flange; 34. Second flange; 35. Score line;

[0039] 40. Orifice plate; 41. Pressure relief hole; 42. Fourth welding portion;

[0040] 50. Sealing element; 511. Inner side of the first portion; 512. Inner side of the second portion; 52. Protruding structure;

[0041] 60. Insulating member; 61. First insulating layer; 611. First portion of first insulating layer; 612. Second portion of first insulating layer; 613. Third portion of first insulating layer; 62. Second insulating layer; 621. First portion of second insulating layer; 622. Second portion of second insulating layer;

[0042] 70. Isolation circle; DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0044] The embodiment of the present utility model provides a battery 1000, such as Figure 1 As shown, taking a cylindrical lithium-ion secondary battery as an example, the battery 1000 includes a shell 10, a cap assembly 100 and a core assembly, wherein the shell 10 is preferably made of nickel-plated steel plate material to form a hollow cylindrical structure with an open top, the cap assembly 100 is connected to the top opening of the shell 10 by crimping and seals the top opening of the shell 10, the core assembly includes a positive electrode sheet, a negative electrode sheet and a diaphragm, the diaphragm is preferably made of polyethylene film material, the diaphragm is used to separate the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the diaphragm and the negative electrode sheet are stacked and then wound layer by layer to form a core assembly.

[0045] The tabs on the positive electrode sheets are electrically connected to the cap assembly 100 or the housing 10 via the positive electrode busbar, or the tabs on the positive electrode sheets are electrically connected directly to the cap assembly 100 or the housing 10. The tabs on the negative electrode sheets are electrically connected to the housing 10 or the cap assembly 100 via the negative electrode busbar, or the tabs on the negative electrode sheets are electrically connected directly to the housing 10 or the cap assembly 100.

[0046] The battery 1000 can be used in a portable electronic device in a combined manner. A battery cavity is provided inside the portable electronic device, and one or more batteries can be accommodated inside the battery cavity, which is matched according to the capacity required by the electronic device. The electronic device can be any device in the relevant technology that requires a lithium-ion battery to provide power supply.

[0047] An embodiment of the present invention also provides a battery pack, in which multiple single cells inside the battery pack can be arranged to be connected in series, or multiple single cells can be arranged to be connected in parallel, or multiple single cells can be arranged to be a mixed connection of series and parallel, so that the battery pack has a capacity and power suitable for use by electrical equipment.

[0048] The battery pack also includes a box body, which is used to fix and protect multiple single cells and other components. The box body can be assembled from several sub-boxes. The materials suitable for preparing the box body have good shock resistance, waterproofness and insulation properties. Suitable materials include metal or plastic materials.

[0049] The above battery packs are applicable to electrical devices including mobile phones, portable devices, laptops, electric bicycles, electric cars, electric boats, electric toys, electric tools, etc.

[0050] like Figure 2 As shown, the structure of the cap assembly 100 of a cylindrical lithium-ion battery is taken as an example for description. The cap assembly 100 generally includes a top cover 20 , an explosion-proof disk 30 and a perforated plate 40 .

[0051] The top cover 20 includes a base portion 21 and a boss portion 22 protruding relative to the base portion 21. The base portion 21 is roughly annular and is arranged on the outer periphery of the boss portion 22. The base portion 21 is configured as a plane, and the boss portion 22 includes a top end surface and a side wall, wherein the top end surface of the boss portion 22 is configured as a planar structure, and the top end surface of the boss portion 22 and the plane where the base portion 21 are located are roughly parallel, and the side wall of the boss portion 22 is arranged between the top end surface and the base portion 21, and the side wall of the boss portion 22 is configured as an inclined surface with a certain slope or a curved surface with a certain curvature.

[0052] The explosion-proof disc 30 includes a main body 31 and an explosion-proof portion 32 . The main body 31 is disposed on the periphery of the explosion-proof portion 32 . The explosion-proof portion 32 of the explosion-proof disc 30 is configured to be reversible.

[0053] The orifice plate 40 can also be called a current cutoff device, which is used to cut off the internal electrical connection of the battery when the battery is in an abnormal state, such as high temperature overcurrent, overcharge, and external short circuit. A pressure relief hole 41 is provided on the orifice plate 40.

[0054] The top cover 20 is mostly made of hard steel material, and the explosion-proof disk 30 is mostly made of hard aluminum alloy material. The base portion 21 of the top cover 20 and the main body portion 31 of the explosion-proof disk 30 are welded.

[0055] Continue with reference 2 and Figure 3The base portion 21 of the top cover 20 includes a first outer surface 211 and a second outer surface 212 that are oppositely arranged. The base portion 21 also includes a first outer side surface 213 that is arranged between the first outer surface 211 and the second outer surface 212.

[0056] The main body 31 of the explosion-proof disk 30 includes a third outer surface 311 and a fourth outer surface 312 that are opposite to each other. The main body 31 also includes a second outer side surface 313 disposed between the third outer surface 311 and the fourth outer surface 312 .

[0057] The base portion 21 of the top cover 20 is welded to the main body portion 31 of the explosion-proof disk 30, thereby electrically connecting the top cover 20 and the explosion-proof disk 30. A first welding portion 214 is provided on the second outer surface 212 of the base portion 21 of the top cover 20, and a second welding portion 314 is provided on the third outer surface 311 of the main body portion 31 of the explosion-proof disk 30.

[0058] refer to Figure 2 、 Figure 4 and Figure 6 The explosion-proof portion 32 of the explosion-proof disk 30 is welded to the orifice plate 40. The central area of ​​the explosion-proof portion 32 is configured as a planar structure. The bottom end surface where the central area of ​​the explosion-proof disk 30 is located is configured as a third welding portion 321, and the top end surface where the central area of ​​the orifice plate 40 is located is configured as a fourth welding portion 42. The third welding portion 321 and the fourth welding portion 42 are welded to electrically connect the explosion-proof disk 30 and the orifice plate 40.

[0059] Continue to refer Figure 2 The cap assembly 100 further includes an isolation ring 70, which is used to isolate the portion outside the welding area of ​​the explosion-proof disk 30 and the orifice plate 40, thereby preventing the portion outside the welding area of ​​the explosion-proof disk 30 and the orifice plate 40 from contacting and short-circuiting, wherein the orthographic projection of the isolation ring 70 on the orifice plate 40 is staggered with the pressure relief hole 41 on the orifice plate 40.

[0060] Continue to refer Figure 2 、 Figure 4 and Figure 6 The cap assembly 100 also includes an explosion-proof structure, which includes a pressure relief hole 41 provided on the orifice plate 40 and an explosion-proof portion 32 of the explosion-proof plate 30. Furthermore, a C-shaped scale line 35 is provided on the explosion-proof portion 32. The scale line 35 is located on the outside of the third welding portion 321, and the scale line 35 is provided corresponding to the area where the pressure relief hole 41 on the orifice plate 40 is located.

[0061] The explosion-proof structure further includes an opening provided in the top cover 20 , and the opening is located on a side wall of the boss portion 22 of the top cover 20 .

[0062] When the pressure inside the battery 1000 reaches a certain threshold, high-pressure airflow enters through the pressure relief hole 41 on the orifice plate 40 and impacts the explosion-proof portion 32 of the explosion-proof disc 30. The explosion-proof portion 32 is configured to be flippable. The explosion-proof portion 32 flips upward, and the explosion-proof portion 32 further drives the third welding portion 321 to disconnect from the fourth welding portion 42, so that the electrical connection between the explosion-proof disc 30 and the orifice plate 40 is interrupted, thereby protecting the battery 1000. When the internal air pressure of the battery 1000 continues to increase, the residual wall at the location of the score line 35 on the explosion-proof disc 30 is cracked, and the high-pressure airflow is released through the outlet formed at the crack of the score line 35 and the opening on the top cover 20.

[0063] The cap assembly 100 in a lithium-ion battery generally includes a top cover 20, an explosion-proof disk 30, and a sealing element 50. The sealing element 50 can be used to seal and insulate between the shell 10 and the top cover 20, and the sealing element 50 can also be used to seal and insulate between the shell 10 and the explosion-proof disk 30. The shell 10 is mostly made of hard aluminum or steel, the top cover 20 is mostly made of hard steel, the explosion-proof disk 30 is mostly made of hard aluminum alloy, and the sealing element 50 is mostly made of flexible plastic material. When high pressure is generated inside the battery or the battery is subjected to external pressure, the shell 10, the explosion-proof disk 30, or the top cover 20 will be deformed by the force and then squeeze the sealing element 50. Since the sealing element 50 is made of flexible material, it is easy to be squeezed and broken, causing the top cover 20 to contact with a part of the shell 10 and short-circuit, or the explosion-proof disk 30 to contact with a part of the shell 10 and short-circuit, thereby causing a short circuit in the battery.

[0064] In the embodiment of the present invention, the structure of the cap assembly 100 is optimized, thereby effectively preventing the sealing element 50 from being squeezed and causing a short circuit in the battery.

[0065] refer to Figure 2 As shown, the cap assembly 100 includes a top cover 20, a burst disk 30, a sealing element 50, and an insulating member 60. The outer side of the sealing element 50 contacts the inner surface of the housing 10. The top cover 20 and the burst disk 30 are sequentially disposed on the inner side of the sealing element 50 from top to bottom. A portion of the outer surface of the top cover 20 is connected to a portion of the outer surface of the burst disk 30. A portion of the insulating member 60 is disposed between the sealing element 50 and the burst disk 30, and / or a portion of the insulating member 60 is disposed between the sealing element 50 and the burst disk 30.

[0066] When a portion of the sealing element 50 is located between the top cover 20 and the shell 10, a portion of the insulating member 60 is disposed between the portion of the sealing element 50 and the top cover 20. Thus, when the portion of the sealing element 50 is squeezed, the top cover 20 and the shell 10 can still be insulated by the insulating member 60, thereby preventing a contact short circuit between the top cover 20 and the shell 10.

[0067] When a portion of the sealing element 50 is located between the bursting disk 30 and the housing 10, a portion of the insulating member 60 is disposed between this portion of the sealing element 50 and the top cover 20. Therefore, when this portion of the sealing element 50 is ruptured, the bursting disk 30 and the housing 10 can still be insulated by the insulating member 60, thereby preventing a contact short circuit between the bursting disk 30 and the housing 10.

[0068] In some embodiments, the insulating member 60 is configured as an insulating layer, and the insulating layer includes a first insulating layer 61 provided on the explosion-proof disk 30 , and / or the insulating layer includes a second insulating layer 62 provided on the top cover 20 .

[0069] The insulating layer is formed by insulating the metal surface. The insulating treatment methods include oxidation, spraying, coating, coating and injection molding. The molding materials of the insulating layer include metal oxides, ceramic films, insulating resins and plastic materials.

[0070] In some optional embodiments, the insulating member 60 may be configured as an insulating glue or an insulating coating, wherein the insulating glue or insulating coating covers a portion of the surface of the explosion-proof disk 30 , and / or the insulating glue or insulating coating covers a portion of the surface of the top cover 20 .

[0071] In another optional embodiment, the insulating member 60 may also be configured as an insulating sleeve, which is disposed on a portion of the surface of the explosion-proof disk 30 and / or disposed on a portion of the surface of the top cover 20 .

[0072] Furthermore, if Figure 2 As shown, a first welding portion 214 is provided on the top cover 20, and the first insulating layer 61 is located in a partial area outside the first welding portion 214; and / or a second welding portion 314 is provided on the explosion-proof plate 30 for welding with the first welding portion 214, and the second insulating layer 62 is located in a partial area outside the second welding portion 314.

[0073] The specific position setting method of the insulating member 60 is optimized according to the structure of the cap assembly 100 .

[0074] like Figures 2 to 3As shown, in the first embodiment provided by the present invention, the outer side surface of the top cover 20 and the outer side surface of the explosion-proof disk 30 are arranged close to the inner side wall of the sealing element 50 in sequence, and the insulating member 60 includes a first insulating layer 61 arranged on the explosion-proof disk 30 and a second insulating layer 62 arranged on the top cover 20, and the second insulating layer 62 and the first insulating layer 61 are arranged on the inner side of the sealing element 50 in sequence.

[0075] When the top cover 20 or the shell 10 deforms toward each other, the sealing element 50 is easily squeezed, and the second insulating layer 62 provided on the top cover 20 further insulates the top cover 20 from the shell 10, thereby preventing the top cover 20 and the shell 10 from contacting and short-circuiting.

[0076] When the explosion-proof disc 30 or the housing 10 deforms toward each other, the sealing element 50 is easily squeezed and ruptured, and the first insulating layer 61 provided on the explosion-proof disc 30 further insulates the explosion-proof disc 30 from the housing 10, thereby preventing the explosion-proof disc 30 from contacting the housing 10 and causing a short circuit.

[0077] Further references Figure 2 and Figure 3 As shown, the top cover 20 includes a first outer surface 211 and a second outer surface 212 disposed opposite each other, and further includes a first outer side surface 213 disposed between the first outer surface 211 and the second outer surface 212; the bursting disk 30 includes a third outer surface 311 and a fourth outer surface 312 disposed opposite each other, and further includes a second outer side surface 313 disposed between the third outer surface 311 and the fourth outer surface 312, with a portion of the second outer surface 212 connected to a portion of the third outer surface 311;

[0078] The first insulating layer 61 includes a first portion of the first insulating layer 611 and a second portion of the first insulating layer 612 connected to each other, the first portion of the first insulating layer 611 covers the second outer side surface 313, and the second portion of the first insulating layer 612 covers a portion of the fourth outer surface 312; and / or,

[0079] The second insulating layer 62 includes a first portion of the second insulating layer 621 and a second portion of the second insulating layer 622 connected in sequence. The first portion of the second insulating layer 621 covers the first outer side surface 213 , and the second portion of the second insulating layer 622 covers a portion of the first outer surface 211 .

[0080] Because the first insulating layer 61 provided on the explosion-proof disk 30 covers the second outer side surface 313 and a portion of the fourth outer surface 312, when the explosion-proof disk 30 and the housing 10 approach each other, the surfaces of the explosion-proof disk 30 that can contact the housing 10 are all covered by the first insulating layer 61, thereby effectively preventing the explosion-proof disk 30 from contacting the housing 10 and causing a short circuit.

[0081] Furthermore, since the second insulating layer 62 provided on the top cover 20 covers the first outer side surface 213 and a portion of the first outer surface 211, when the top cover 20 and the shell 10 approach each other, the surface of the top cover 20 that can contact the shell 10 is covered by the second insulating layer 62, thereby effectively preventing the top cover 20 from contacting the shell 10 and causing a short circuit.

[0082] like Figure 4 and Figure 5 As shown, in the second embodiment provided by the present invention, the explosion-proof disk 30 is provided with a first flange 33, and the first flange 33 is configured to be arranged around a portion of the outer side surface of the top cover 20. The insulating member 60 includes a first insulating layer 61 provided on the explosion-proof disk 30 and a second insulating layer 62 provided on the top cover 20; the first insulating layer 61 is provided on the inner side of the sealing element 50, and the second insulating layer 62 is provided on the inner side of the first flange 33.

[0083] When the explosion-proof disc 30 or the housing 10 deforms toward each other, the sealing element 50 is easily squeezed and ruptured, and the first insulating layer 61 provided on the explosion-proof disc 30 further insulates the explosion-proof disc 30 from the housing 10, thereby preventing the explosion-proof disc 30 from contacting the housing 10 and causing a short circuit.

[0084] Furthermore, since the first flange 33 on the explosion-proof disk 30 is configured to surround the first portion of the outer side surface of the top cover 20, the top cover 20 does not contact the housing 10. The second insulating layer 62 provided on the top cover 20 can prevent the sealing element 50 from being damaged after the battery is squeezed, thereby preventing the housing 10 from contacting the top cover 20 and causing a short circuit.

[0085] Further references Figure 4 and Figure 5 As shown, the first insulating layer 61 includes a first portion of the first insulating layer 611, a second portion of the first insulating layer 612, and a third portion of the first insulating layer 613, which are connected in sequence. The first portion of the first insulating layer 611 covers at least a portion of the top surface of the first flange 33, the second portion of the first insulating layer 612 covers the first outer side surface 213 of the explosion-proof disk 30, and the third portion of the first insulating layer 613 covers a portion of the fourth outer surface 312 of the explosion-proof disk 30; and / or,

[0086] The top cover 20 is provided with a second insulating layer 62, and the second insulating layer 62 includes a first portion of the second insulating layer 621 and a second portion of the second insulating layer 622 connected in sequence. The first portion of the second insulating layer 621 covers the second outer side surface 313 of the top cover 20, and the second portion of the second insulating layer 622 covers a portion of the first outer surface 211 of the top cover 20.

[0087] Because the first insulating layer 61 provided on the explosion-proof disk 30 covers the first outer side surface 213, the top surface of the first flange 33, and a portion of the fourth outer surface 312, when the explosion-proof disk 30 and the housing 10 approach each other, the outer surface of the explosion-proof disk 30 that can contact the housing 10 is covered by the first insulating layer 61, thereby effectively preventing the explosion-proof disk 30 from contacting the housing 10 and causing a short circuit.

[0088] Furthermore, since the first flange 33 on the explosion-proof disk 30 is configured to surround a portion of the second outer side 313 of the top cover 20, the top cover 20 will not contact the housing 10. Figure 4 As shown, the second outer side surface 313 of the top cover 20 is arranged close to the inner side surface of the first flange 33 of the explosion-proof disk 30. By providing a second insulating layer 62 on the top cover 20, the second insulating layer 62 covers the second outer side surface 313 and a portion of the first outer surface 211, thereby preventing the sealing element 50 from being damaged after being squeezed when the battery is squeezed, thereby preventing the shell 10 from contacting the top cover 20.

[0089] In other optional examples, the first flange 33 layer may further cover the inner side of the first flange 33 , thereby preventing the explosion-proof disk 30 from contacting the top cover 20 and causing a short circuit.

[0090] like Figure 6 and Figure 7 As shown, in the third embodiment provided by the present invention, the explosion-proof disk 30 is provided with a second flange 34, and the second flange 34 is configured to surround the first outer side surface 213 of the top cover 20, and the second flange 34 is in contact with the first outer surface 211 of the top cover 20, and the insulating member 60 is configured as a first insulating layer 61 provided on the explosion-proof disk 30, and the first insulating layer 61 is provided on the inner side of the sealing element 50.

[0091] Because the second flange 34 is configured to surround the first outer side surface 213 of the top cover 20, the top cover 20 does not contact the housing 10. Furthermore, the top end of the second flange 34 abuts the first outer surface 211 of the top cover 20. Therefore, during the deformation of the explosion-proof disk 30, the inner side surface of the second flange 34 does not contact the first outer side surface 213 of the top cover 20. Therefore, by providing only the first insulating layer 61 on the explosion-proof disk 30, a short circuit between the explosion-proof disk 30 and the housing 10 can be avoided.

[0092] Further references Figure 6 and Figure 7 As shown, the first insulating layer 61 includes a first portion of the first insulating layer 611, a second portion of the first insulating layer 612, and a third portion of the first insulating layer 613, which are connected in sequence. The first portion of the first insulating layer 611 covers at least a portion of the top surface of the second flange 34, the second portion of the first insulating layer 612 covers the second outer side surface 313 of the explosion-proof disk 30, and the third portion of the first insulating layer 613 covers a portion of the fourth outer surface 312 of the explosion-proof disk 30.

[0093] Because the first insulating layer 61 provided on the explosion-proof disk 30 covers the first outer side surface 213, the top surface of the first flange 33, and a portion of the fourth outer surface 312, when the explosion-proof disk 30 and the housing 10 approach each other, the outer surface of the explosion-proof disk 30 that can contact the housing 10 is covered by the first insulating layer 61, thereby effectively preventing the explosion-proof disk 30 from contacting the housing 10 and causing a short circuit.

[0094] Further references Figures 2 to 6 As shown, the inner side surface of the sealing element 50 includes a first inner side surface 511 and a second inner side surface 512 , a protrusion structure 52 is provided between the first inner side surface 511 and the second inner side surface 512 , and the insulating member 60 is provided close to the second inner side surface 512 .

[0095] The raised structure 52 on the sealing element 50 is used to limit the top cover 20 to prevent the sealing element 50 from separating from the top cover 20. Further, by providing an insulating member 60 near the second portion inner side surface 512 of the sealing element 50, the partial segment of the sealing element 50 corresponding to the second portion inner side surface 512 is effectively prevented from being squeezed by the top cover 20 or the explosion-proof disk 30 or the shell 10, so that the first outer side surface 213 of the top cover 20 contacts the shell 10, or the second outer side surface 313 of the explosion-proof disk 30 contacts the shell 10.

[0096] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A cap assembly, the cap assembly being used for a battery, characterized in that: The cap assembly comprises: A sealing element, the outer side of which contacts the inner surface of the battery housing; A top cover, the top cover being arranged on the inner side of the sealing element; a bursting disk, the bursting disk being disposed inside the sealing element, a portion of the outer surface of the bursting disk being connected to a portion of the outer surface of the top cover; and An insulating member, a portion of which is disposed between the sealing element and the explosion-proof disk; and / or a portion of which is disposed between the sealing element and the top cover.

2. The cap assembly according to claim 1, characterized in that: The insulating member is configured as an insulating layer, and the insulating layer includes a first insulating layer disposed on the explosion-proof disk, and / or the insulating layer includes a second insulating layer disposed on the top cover.

3. The cap assembly according to claim 2, characterized in that: The top cover is provided with a first welding portion, and the first insulating layer is located in a partial area outside the first welding portion; and / or, The explosion-proof plate is provided with a second welding portion welded to the first welding portion, and the second insulating layer is located in a partial area outside the second welding portion.

4. The cap assembly according to claim 1, characterized in that: The outer side wall of the top cover and the outer side wall of the explosion-proof disk are arranged close to the inner side wall of the sealing element in sequence, and the insulating member includes a first insulating layer arranged on the explosion-proof disk and a second insulating layer arranged on the top cover, and the second insulating layer and the first insulating layer are arranged on the inner side of the sealing element in sequence.

5. The cap assembly according to claim 4, characterized in that: The top cover comprises a first outer surface and a second outer surface which are arranged opposite to each other, and the top cover further comprises a first outer side surface which is arranged between the first outer surface and the second outer surface; the explosion-proof disk comprises a third outer surface and a fourth outer surface which are arranged opposite to each other, and the explosion-proof disk further comprises a second outer side surface which is arranged between the third outer surface and the fourth outer surface, and a part of the second outer surface is connected to a part of the third outer surface; The first insulating layer comprises a first portion of the first insulating layer and a second portion of the first insulating layer connected to each other, the first portion of the first insulating layer covers the second outer side surface, and the second portion of the first insulating layer covers a portion of the fourth outer surface; and / or, The second insulating layer includes a first portion of the second insulating layer and a second portion of the second insulating layer connected to each other, wherein the first portion of the second insulating layer covers the first outer side surface, and the second portion of the second insulating layer covers a portion of the first outer surface.

6. The cap assembly according to claim 1, characterized in that: The explosion-proof disk is provided with a first flange, and the first flange is configured to be arranged around a portion of the first outer side surface of the top cover. The insulating member includes a first insulating layer arranged on the explosion-proof disk and a second insulating layer arranged on the top cover; the first insulating layer is arranged on the inner side of the sealing element, and the second insulating layer is arranged on the inner side of the first flange.

7. The cap assembly according to claim 6, characterized in that: The first insulating layer comprises a first portion first insulating layer, a second portion first insulating layer, and a third portion first insulating layer connected in sequence, wherein the first portion first insulating layer covers at least a portion of the top end surface of the flange, the second portion first insulating layer covers the first outer side surface of the explosion-proof disk, and the third portion first insulating layer covers a portion of the fourth outer surface of the explosion-proof disk; and / or, A second insulating layer is arranged on the top cover, and the second insulating layer includes a first part of the second insulating layer and a second part of the second insulating layer connected in sequence, the first part of the second insulating layer covers the second outer side of the top cover, and the second part of the second insulating layer covers a part of the first outer surface of the top cover.

8. The cap assembly according to claim 1, characterized in that: The explosion-proof disk is provided with a second flange, the second flange is configured to surround the first outer side surface of the top cover, and the second flange is in contact with the first outer surface of the top cover, the insulating member is configured as a first insulating layer provided on the explosion-proof disk, and the first insulating layer is provided on the inner side of the sealing element.

9. The cap assembly according to claim 8, characterized in that: The first insulating layer includes a first portion first insulating layer, a second portion first insulating layer, and a third portion first insulating layer connected in sequence, the first portion first insulating layer covers at least a portion of the top end surface of the second flange, the second portion first insulating layer covers the second outer side surface of the explosion-proof plate, and the third portion first insulating layer covers a portion of the fourth outer surface of the explosion-proof plate.

10. The cap assembly according to any one of claims 1 to 9, characterized in that: The inner side surface of the sealing element includes a first portion inner side surface and a second portion inner side surface, a protrusion structure is arranged between the first portion inner side surface and the second portion inner side surface, and the insulating member is arranged close to the second portion inner side surface.

11. A battery, characterized in that: The battery comprises the cap assembly according to any one of claims 1 to 10, and the battery comprises a cylindrical lithium-ion battery.

12. A battery pack, characterized in that: The battery pack includes a plurality of batteries, and each of the batteries includes the cap assembly according to any one of claims 1-10.

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