Cap assembly and battery

Abstract

The utility model provides a cap assembly. The orthographic projection of at least part of an insulating spacer on a pore plate is located in a first exhaust hole. Part of the anti-explosion piece penetrates through the center hole to abut against the hole plate, and other parts of the anti-explosion piece are connected with the hole plate, so that short circuit is caused. In the battery safety test process, at least part of the insulation spacer is isolated between the first exhaust hole of the pore plate and the anti-explosion piece, the probability that the pore plate and the anti-explosion piece are in contact at the pressure relief position of the first exhaust hole and are short-circuited is reduced, and the cap assembly can meet the insulation requirement of the pore plate and the anti-explosion piece. The utility model also provides a battery comprising the cap assembly, and the battery has the above beneficial effects.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a cap assembly and a battery. Background Art

[0002] Generally, the cap assembly of a battery includes a top cover, an explosion-proof sheet, an orifice plate, and an insulating gasket disposed between the explosion-proof sheet and the orifice plate. In the related art, the exhaust holes of the orifice plate and the insulating gasket have the same shape and size. During the battery safety test, when the orifice plate and the insulating gasket rotate relative to each other or move and deviate, the orifice plate is likely to contact the explosion-proof sheet and cause a short circuit, thus failing to meet the insulation requirements between the orifice plate and the explosion-proof sheet and affecting the safety performance of the battery. Summary of the Utility Model

[0003] The purpose of the embodiments of the present application is to provide a cap assembly and a battery, which can improve the technical problem of short circuit caused by contact between the orifice plate and the explosion-proof sheet in the battery.

[0004] In a first aspect, the embodiments of the present application provide a cap assembly applied to a battery, including:

[0005] An orifice plate, on which a first exhaust hole is formed;

[0006] An explosion-proof sheet; and

[0007] An insulating gasket disposed between the orifice plate and the explosion-proof sheet, and a central hole is formed on the insulating gasket;

[0008] Wherein, a part of the explosion-proof sheet passes through the central hole and abuts against the orifice plate, and the orthographic projection of a part of the insulating gasket on the orifice plate is located within the first exhaust hole.

[0009] In an embodiment, an axially penetrating second exhaust hole is formed on the insulating gasket, the second exhaust hole is located on the periphery of the central hole, the orthographic projection of the second exhaust hole on the orifice plate is located within the first exhaust hole, and the second exhaust hole is communicated with the first exhaust hole.

[0010] In an embodiment, there are multiple first exhaust holes, and the multiple first exhaust holes are rotationally symmetric about the center of the orifice plate;

[0011] There are multiple second exhaust holes, the multiple second exhaust holes are rotationally symmetric about the center of the insulating gasket, and the interval between adjacent two second exhaust holes is greater than the interval between adjacent two first exhaust holes.

[0012] In one embodiment, one of the first exhaust holes corresponds to two of the second exhaust holes. In the orthographic projection of the orifice plate, the two second exhaust holes are distributed on both sides of the center line of the corresponding first exhaust hole and are symmetrically arranged with respect to the center line of the first exhaust hole.

[0013] In one embodiment, there are multiple second exhaust holes, and the multiple second exhaust holes are rotationally symmetric about the center of the insulating gasket;

[0014] There are multiple first exhaust holes, and the multiple first exhaust holes are rotationally symmetric about the center of the orifice plate;

[0015] The rotation angle between two adjacent second exhaust holes is 1 / 2 of the rotation angle between two adjacent first exhaust holes.

[0016] In one embodiment, one of the first exhaust holes corresponds to one of the second exhaust holes. The shape of the first exhaust hole is the same as that of the second exhaust hole, and they are coaxially arranged. The inner diameter of the second exhaust hole is smaller than that of the first exhaust hole.

[0017] In one embodiment, in the orthographic projection of the orifice plate, the ratio of the total area of the second exhaust holes located in one of the first exhaust holes to the area of one of the first exhaust holes is 2:5 to 4:5.

[0018] In one embodiment, the distance from the hole wall of the second exhaust hole to the hole wall of the first exhaust hole is greater than or equal to 0.2 millimeters.

[0019] In one embodiment, the surface of the explosion-proof sheet facing away from the orifice plate is provided with scoring lines, and the scoring lines are located within the orthographic projection of the second exhaust holes on the explosion-proof sheet.

[0020] In one embodiment, the explosion-proof sheet includes a body portion and a convex portion. The convex portion is provided on the surface of the body portion close to the orifice plate, and the convex portion passes through the central hole and abuts against the orifice plate;

[0021] The insulating gasket includes a connected first sub-portion and a second sub-portion. The first sub-portion is annularly arranged outside the second sub-portion. The second exhaust holes are located in the first sub-portion, and the central hole is opened in the second sub-portion;

[0022] Along the stacking direction of the orifice plate, the insulating gasket, and the explosion-proof sheet, the inner diameter of the second sub-portion increases, and the maximum inner diameter of the second sub-portion is less than or equal to the maximum diameter of the convex portion.

[0023] In a second aspect, an embodiment of the present application provides a battery, which includes the above-mentioned cap assembly, and further includes a housing and an electric core disposed in the housing, and the cap assembly is assembled on the housing.

[0024] The beneficial effects of the cap assembly provided by the embodiments of the present application are as follows: Compared with the related art, in the cap assembly of the present application, the orthographic projection of at least part of the insulating gasket on the orifice plate is located within the first exhaust hole. Since part of the explosion-proof sheet passes through the central hole and abuts against the orifice plate, connecting other parts of the explosion-proof sheet to the orifice plate will cause a short circuit. During the battery safety test, at least part of the insulating gasket isolates between the first exhaust hole of the orifice plate and the explosion-proof sheet, reducing the probability of short circuit due to the contact between the orifice plate and the explosion-proof sheet at the pressure relief part of the first exhaust hole. The cap assembly of the present application can meet the insulation requirements of the orifice plate and the explosion-proof sheet. In addition, since part of the insulating gasket isolates between the first exhaust hole of the orifice plate and the explosion-proof sheet, the friction force between the insulating gasket and the orifice plate or the explosion-proof sheet increases, and the rotation or movement of the insulating gasket is further restricted during the battery safety test, thereby reducing the possibility of short circuit caused by the movement of the insulating gasket and the contact between the orifice plate and the explosion-proof sheet. The embodiments of the present application also provide a battery including the above cap assembly, which has the above beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 Schematic cross-sectional structure diagram of the cap assembly provided by the first embodiment of the present application;

[0027] Figure 2 Orthographic projection diagram of the insulating gasket on the orifice plate in the cap assembly provided by the first embodiment of the present application;

[0028] Figure 3 Orthographic projection diagram of the insulating gasket on the orifice plate in the cap assembly provided by the second embodiment of the present application;

[0029] Figure 4 Schematic top view structure diagram of the insulating gasket in the cap assembly provided by the first embodiment of the present application;

[0030] Figure 5 Schematic top view structure diagram of the orifice plate in the cap assembly provided by the first embodiment of the present application;

[0031] Figure 6 Schematic cross-sectional structure diagram of the cap assembly provided by the third embodiment of the present application;

[0032] Figure 7 Orthographic projection diagram of the insulating gasket on the orifice plate in the cap assembly provided by the third embodiment of the present application;

[0033] Figure 8 Explosion structure schematic diagram of the battery provided by the fourth embodiment of the present application;

[0034] Among them, each reference numeral in the figure:

[0035] 1000, battery; 100, cap assembly; 200, battery cell; 300, housing;

[0036] 110, sealing ring; 120, orifice plate; 130, insulating gasket; 140, explosion-proof film; 150, top cover;

[0037] K1, first exhaust hole; K2, center hole; K3, second exhaust hole;

[0038] A, welding area;

[0039] C, center line; 131, first sub-part; 132, second sub-part;

[0040] 141, body part; 142, protruding part; I, scoring line. Detailed implementation manners

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more, unless otherwise specifically defined.

[0045] Please refer to Figure 1 and Figure 2 together. Now, the cap assembly 100 provided in the first embodiment of this application will be described. The cap assembly 100 of this application is applied to a battery. As Figure 1 shown, the cap assembly 100 includes a top cover 150, a sealing ring 110, an explosion-proof sheet 140, an insulating gasket 130, and an orifice plate 120. There is an accommodation space inside the sealing ring 110, and the orifice plate 120, the insulating gasket 130, and the explosion-proof sheet 140 are stacked on top of each other in the accommodation space of the sealing ring 110 from bottom to top. The top cover 150 is disposed at the end of the sealing ring 110 and is located on the side of the explosion-proof sheet 140 away from the orifice plate 120. Specifically, the explosion-proof sheet 140 is disposed on one side of the orifice plate 120, and the insulating gasket 130 is disposed between the orifice plate 120 and the explosion-proof sheet 140.

[0046] Among them, a welding area A is provided on the surface of the orifice plate 120 close to the explosion-proof sheet 140 for welding with the explosion-proof sheet 140 to form an electrical path. The explosion-proof sheet 140 includes a body portion 141 and a convex portion 142. The convex portion 142 is disposed on the surface of the body portion 141 close to the orifice plate 120 for welding with the orifice plate 120. Specifically, a central hole K2 is provided on the insulating gasket 130. The convex portion 142 of the explosion-proof sheet 140 passes through the central hole K2 and abuts against the welding area A of the orifice plate 120 and is welded to the welding area A of the orifice plate 120. The side of the explosion-proof sheet 140 facing away from the orifice plate 120 is welded to the top cover 150. Optionally, the explosion-proof sheet 140 can also be welded to the top cover 150 by providing a welding portion on the side facing away from the orifice plate 120.

[0047] An axially penetrating first exhaust hole K1 is also provided on the orifice plate 120 for explosion-proof pressure relief of the battery. The first exhaust hole K1 is located outside the welding area A. A central hole K2 is provided on the insulating gasket 130. The explosion-proof sheet 140 is connected to the orifice plate 120 through the central hole K2.

[0048] As Figure 2 shown, the orthographic projection of part of the insulating gasket 130 on the orifice plate 120 is located inside the first exhaust hole K1. That is, at least part of the insulating gasket 130 is located between the first exhaust hole K1 and the body portion 141 of the explosion-proof sheet 140.

[0049] Since the protruding portion 142 of the explosion-proof sheet 140 passes through the central hole K2 and abuts against the orifice plate 120, connecting other parts of the explosion-proof sheet 140 to the orifice plate 120 will cause a short circuit. In this application, by setting the orthographic projection of the partial insulating gasket 130 on the orifice plate 120 to be located within the first exhaust hole K1, during the battery safety test, at least part of the insulating gasket 130 is isolated between the first exhaust hole K1 of the orifice plate 120 and the body portion 141 of the explosion-proof sheet 140, reducing the probability of the orifice plate 120 and the explosion-proof sheet 140 contacting and short-circuiting at the pressure relief of the first exhaust hole K1. The cap assembly 100 of this application can meet the insulation requirements of the orifice plate 120 and the explosion-proof sheet 140. Additionally, since at least part of the insulating gasket 130 is isolated between the first exhaust hole K1 of the orifice plate 120 and the body portion 141 of the explosion-proof sheet 140, the frictional force between the insulating gasket 130 and the orifice plate 120 or the explosion-proof sheet 140 increases, further restricting the rotation or movement of the insulating gasket 130 during the battery safety test, thereby reducing the possibility of the orifice plate 120 and the explosion-proof sheet 140 contacting and short-circuiting due to the movement of the insulating gasket 130.

[0050] In this embodiment, the insulating gasket 130 is provided with an axially penetrating second exhaust hole K3, and the second exhaust hole K3 is located on the circumferential side of the central hole K2. The orthographic projection of the second exhaust hole K3 on the orifice plate 120 is located within the first exhaust hole K1, and the second exhaust hole K3 communicates with the first exhaust hole K1. It should be noted that the orthographic projection of the second exhaust hole K3 on the orifice plate 120 being located within the first exhaust hole K1 means that all the edges of the second exhaust hole K3 are located within the first exhaust hole K1 or some edges coincide with the edges of the first exhaust hole K1, and the area of one second exhaust hole K3 is smaller than the area of one first exhaust hole K1.

[0051] In the orthographic projection of the orifice plate 120, one side edge of the second exhaust hole K3 can coincide with one side edge of the first exhaust hole K1, and part of the insulating gasket 130 protrudes from the edge of the first exhaust hole K1 that does not coincide with the edge of the second exhaust hole K3, or both side edges of the second exhaust hole K3 coincide with both side edges of the first exhaust hole K1, and part of the insulating gasket 130 protrudes from the edge of the first exhaust hole K1 that does not coincide with the edge of the second exhaust hole K3. In this embodiment, one side edge of the second exhaust hole K3 coincides with one side edge of the first exhaust hole K1, and the insulating gasket 130 protrudes from the other edge of the first exhaust hole K1 that does not coincide with the edge of the second exhaust hole K3, as shown in Figure 2 shown. Optionally, in some other embodiments, three side edges of the second exhaust hole K3 coincide with the edges of the first exhaust hole K1, and part of the insulating gasket 130 protrudes from the opposite side wall edges of the first exhaust hole K1, as shown in Figure 3 the second exhaust hole K3 shown.

[0052] Please refer toFigure 2 , Figure 4 and Figure 5 , the second exhaust hole K3 communicates with the first exhaust hole K1 to form an exhaust passage. Since the second exhaust hole K3 is correspondingly arranged with the first exhaust hole K1, the second exhaust hole K3 communicates with the first exhaust hole K1. One end of the first exhaust hole K1 communicates with the inner cavity of the battery, and the other end communicates with the second exhaust hole K3. When the internal pressure of the battery is too high, the internal gas is released through the first exhaust hole K1 and the second exhaust hole K3 to relieve pressure and prevent the battery from exploding.

[0053] Optionally, a scoring line I is arranged on the surface of the explosion-proof sheet 140 facing away from the orifice plate 120, and the scoring line I is located within the orthographic projection of the second exhaust hole K3 on the explosion-proof sheet 140. Optionally, the scoring line I is in the structure of an annular groove. It can be understood that the thickness of the explosion-proof sheet 140 at the scoring line I is relatively thin and is easily broken to form a crack under the action of high-pressure gas, so as to discharge the high-pressure gas. When the internal pressure of the battery is too high, the high-pressure gas is discharged from the second exhaust hole K3, and the position of the scoring line I corresponding to the second exhaust hole K3 makes it easier for the explosion-proof sheet 140 at the scoring line I to break and form a crack.

[0054] As Figure 5 shown, there are multiple first exhaust holes K1. The multiple first exhaust holes K1 are rotationally symmetric about the center of the orifice plate 120, that is, one first exhaust hole K1 can coincide with another first exhaust hole K1 after rotating a certain angle along the center of the orifice plate 120. Correspondingly, there are multiple second exhaust holes K3, and the multiple second exhaust holes K3 are rotationally symmetric about the center of the insulating gasket 130. In this embodiment, two second exhaust holes K3 are correspondingly arranged for one first exhaust hole K1. The number of the first exhaust holes K1 is 5, and correspondingly, the number of the second exhaust holes K3 is 10.

[0055] Optionally, the number of the first exhaust holes K1 can also be 4. Two second exhaust holes K3 are correspondingly arranged for one first exhaust hole K1, and correspondingly, the total number of the second exhaust holes K3 on the insulating gasket 130 is 8.

[0056] Optionally, one second exhaust hole K3 can also be correspondingly arranged for one first exhaust hole K1, or three second exhaust holes K3 are correspondingly arranged for one first exhaust hole K1, and so on.

[0057] Optionally, the interval G2 between two adjacent second exhaust holes K3 is greater than the interval G1 between two adjacent first exhaust holes K1. As Figure 2As shown, in the cap assembly 100, the interval G1 between two adjacent first exhaust holes K1 corresponds to the interval G2 between two adjacent second exhaust holes K3. The side of the insulating gasket 130 between two adjacent second exhaust holes K3 close to the orifice plate 120 contacts the interval G1 between the corresponding two adjacent first exhaust holes K1, and thus has friction. If the insulating gasket 130 and the orifice plate 120 are relatively rotated or moved under extrusion, since the interval G2 between two adjacent second exhaust holes K3 is greater than the interval G1 between two adjacent first exhaust holes K1, the intervals G1 and G2 still contact and have friction, so that the rotation and movement of the insulating gasket 130 are restricted.

[0058] Moreover, the side of the insulating gasket 130 between two adjacent second exhaust holes K3 close to the explosion-proof film 140 contacts the explosion-proof film 140, and thus has friction. The greater the interval G2 between two adjacent second exhaust holes K3 is, the greater the friction between the insulating gasket 130 and the explosion-proof film 140 is, further restricting the movement of the insulating gasket 130.

[0059] In this embodiment, the interval G1 between two adjacent first exhaust holes K1 is 1 millimeter (mm). The interval G2 between two adjacent second exhaust holes K3 is 2.2 mm.

[0060] As Figure 2 and Figure 4 shown, in this embodiment, one first exhaust hole K1 corresponds to two second exhaust holes K3. In the orthographic projection of the orifice plate, the two second exhaust holes K3 are distributed on both sides of the center line C of the first exhaust hole K1 and are symmetrically arranged about the center line C. When the internal pressure of the battery is too high, it is discharged from the second exhaust holes K3 on both sides of the center line C of the first exhaust hole K1. The two second exhaust holes K3 are symmetric about the center line C on both sides of the first exhaust hole K1, that is, the two second exhaust holes K3 are symmetrically arranged about a part of the insulating gasket 130 located in the first exhaust hole K1, and the pressure received by the part of the insulating gasket 130 located in the first exhaust hole K1 is relatively uniform, and the exhaust is more uniform.

[0061] As described above, multiple second exhaust holes K3 are rotationally symmetric about the center of the insulating gasket 130. Multiple first exhaust holes K1 are rotationally symmetric about the center of the orifice plate 120. The rotation angle α2 of two adjacent second exhaust holes K3 is 1 / 2 of the rotation angle α1 of multiple first exhaust holes K1, as Figure 4 and Figure 5As shown in the figure. In this embodiment, there are 5 first exhaust holes K1, and the rotation angle α1 between two adjacent first exhaust holes K1 is 72°, so that a plurality of first exhaust holes K1 are evenly spaced on the orifice plate 120. Correspondingly, the rotation angle α2 of the two second exhaust holes K3 on the insulating gasket 130 is 36°, so that a plurality of second exhaust holes K3 are evenly spaced on the insulating gasket 130, so as to exhaust air evenly and relieve pressure.

[0062] Optionally, in some other embodiments, there are 4 first exhaust holes K1, and the rotation angle α1 between two adjacent first exhaust holes K1 is 90°. Correspondingly, the rotation angle α2 of the two adjacent second exhaust holes K3 on the insulating gasket 130 is 45°.

[0063] Optionally, in the orthographic projection of the orifice plate 120, the ratio of the area of the part of the insulating gasket 130 located in a first exhaust hole K1 to the area of a first exhaust hole K1 is 1:5 to 3:5, such as 1:5, 1.25:5, 1.5:5, 2:5, 2.5:5 or 3:5, etc. Correspondingly, in the orthographic projection of the orifice plate 120, the ratio of the total area of the second exhaust holes K3 located in a first exhaust hole K1 to the area of a first exhaust hole K1 is 2:5 to 4:5. That is, the ratio of the total area of the second exhaust holes K3 corresponding to a first exhaust hole K1 to the area of a first exhaust hole K1 is between 2:5 and 4:5, such as 4:5, 3.75:5, 3.5:5, 3:5, 2.5:5 or 2:5, etc. In this embodiment, in the orthographic projection of the orifice plate 120, the ratio of the area of the part of the insulating gasket 130 located in a first exhaust hole K1 to the area of a first exhaust hole K1 is 2:5, and the ratio of the total area of the second exhaust holes K3 corresponding to a first exhaust hole K1 to the area of a first exhaust hole K1 is 3:5. If the area of the part of the insulating gasket 130 located in a first exhaust hole K1 in the orthographic projection of the orifice plate 120 is too large, the exhaust speed of the battery is too slow and the explosion-proof effect is weak. If the area of the second exhaust hole K3 is too large and the area where the insulating gasket 130 protrudes from the first exhaust hole K1 is small, the insulation effect between the hole wall of the first exhaust hole K1 of the orifice plate 120 and the explosion-proof film 140 decreases. In the orthographic projection of the orifice plate 120, the ratio of the area of the part of the insulating gasket 130 located in a first exhaust hole K1 to the area of a first exhaust hole K1 is 1:5 to 3:5, which can increase the insulation area between the orifice plate 120 and the explosion-proof film 140 while ensuring smooth exhaust and pressure relief.

[0064] In this embodiment, the second exhaust hole K3 is a circular hole with a diameter of 1 mm. The distance from the center of the second exhaust hole K3 to the center of the insulating gasket 130 is 5.15 mm. The first exhaust hole K1 is in the shape of a waist hole with an inner ring radius of 4.2 mm and an outer ring radius of 5.65 mm. The width of the first exhaust hole K1 is 1.45 mm, and the length is about 5 - 5.2 mm.

[0065] Please refer to Figure 6 and Figure 7 . The structure of this third embodiment is substantially the same as that of the first embodiment. The differences between this third embodiment and the first embodiment are as follows: the specific structure of the insulating gasket 130 and the number, shape, and position of the second exhaust holes K3 are different.

[0066] As Figure 6 shown, the insulating gasket 130 includes a connected first sub - part 131 and a second sub - part 132. The first sub - part 131 is disposed around the outer side of the second sub - part 132. The second exhaust holes K3 are located in the first sub - part 131, and the central hole K2 is opened in the second sub - part 132.

[0067] Along the stacking direction of the hole plate 120, the insulating gasket 130, and the explosion - proof sheet 140, the inner diameter of the second sub - part 132 increases. The maximum inner diameter D1 of the second sub - part 132 is less than or equal to the maximum diameter D2 of the convex part 142. The inner wall of the second sub - part 132 is the hole wall of the central hole K2, that is, the inner diameter of the second sub - part 132 is the diameter of the central hole K2. The diameter of the central hole K2 gradually decreases along the stacking direction of the hole plate 120, the insulating gasket 130, and the explosion - proof sheet 140. The maximum diameter of the central hole K2 is greater than or equal to the maximum diameter D2 of the convex part 142. In this application, the diameter of the convex part 142 gradually increases along the stacking direction of the hole plate 120, the insulating gasket 130, and the explosion - proof sheet 140.

[0068] In this third embodiment, the maximum inner diameter D1 of the second sub - part 132 is equal to the maximum diameter D2 of the convex part 142. The maximum diameter of the central hole K2 is equal to the maximum diameter D2 of the convex part 142.

[0069] It can be understood that along the stacking direction of the hole plate 120, the insulating gasket 130, and the explosion - proof sheet 140, the inner diameter of the second sub - part 132 increases. The second sub - part 132 can isolate the hole plate 120 and the main body part 141 of the explosion - proof sheet 140 around the convex part 142, further increasing the insulation area. Also, because the inner diameter of the second sub - part 132 gradually increases, a gap is formed between the second sub - part 132 and the hole plate 120. Even if the second sub - part 132 deforms within the gap, it can still play an insulating role, and because of the insufficient length, the second sub - part 132 will not interfere with the convex part 142 and affect the connection of the welding area A between the convex part 142 and the hole plate 120.

[0070] As Figure 7As shown, a first exhaust hole K1 corresponds to a second exhaust hole K3. The shape of the first exhaust hole K1 is the same as that of the second exhaust hole K3 and they are coaxially arranged, so that the high-pressure gas can pass through the second exhaust hole K3 more smoothly after passing through the first exhaust hole K1. In this third embodiment, both the first exhaust hole K1 and the second exhaust hole K3 are waist-shaped holes. Optionally, both the first exhaust hole K1 and the second exhaust hole K3 can also be circular or elliptical, etc. The inner diameter of the second exhaust hole K3 is smaller than that of the first exhaust hole K1, and insulating gaskets 130 are provided between the four side walls of the first exhaust hole K1 and the explosion-proof sheet 140 to further reduce the possibility of the wall of the first exhaust hole K1 contacting the explosion-proof sheet 140 and causing a short circuit. The distance from the wall of the second exhaust hole K3 to the wall of the first exhaust hole K1 is greater than or equal to 0.2 mm. Even if the orifice plate 120 moves relative to the insulating gasket 130 by 0.2 mm, there is still an insulating gasket 130 isolating between the first exhaust hole K1 of the orifice plate 120 and the explosion-proof sheet 140, further reducing the possibility of a short circuit between the orifice plate 120 and the explosion-proof sheet 140.

[0071] Optionally, in this third embodiment, in the orthographic projection of the orifice plate 120, the ratio of the area of a part of the insulating gasket 130 located in a first exhaust hole K1 to the area of a first exhaust hole K1 is 1:5 to 3:5.

[0072] In this third embodiment, the distance from the wall of the second exhaust hole K3 to the wall of the first exhaust hole K1 is between 0.2 mm and 1 mm. Optionally, the distance from the wall of the second exhaust hole K3 to the wall of the first exhaust hole K1 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm, etc. It can be specifically set according to the sizes of the first exhaust hole K1 and the second exhaust hole K3.

[0073] Please refer to Figure 8 , the fourth embodiment of the present application also provides a battery 1000. The battery 1000 includes the above-mentioned cap assembly 100, and further includes a housing 300 and a battery cell 200 disposed in the housing 300, and the cap assembly 100 is assembled on the housing 300. Since part of the insulating gasket 130 isolates between the pressure relief part of the orifice plate 120 and the explosion-proof sheet 140, the probability of a short circuit between the orifice plate 120 and the explosion-proof sheet 140 is further reduced during the safety test of the battery 1000, preventing the orifice plate 120 and the explosion-proof sheet 140 from being connected and short-circuited at the exhaust pressure relief part. The battery 1000 of the present application can meet the insulation requirements of the orifice plate 120 and the explosion-proof sheet 140.

[0074] The above is the description of the cap assembly 100 and the battery 1000 provided by the embodiments of the present application.

[0075] In the cap assembly provided by the embodiment of the present application, the orthographic projection of at least part of the insulating gasket on the orifice plate is located within the first exhaust hole. Since part of the explosion-proof sheet passes through the central hole and abuts against the orifice plate, connecting other parts of the explosion-proof sheet to the orifice plate will cause a short circuit. During the battery safety test, at least part of the insulating gasket isolates between the first exhaust hole of the orifice plate and the explosion-proof sheet, reducing the probability of short circuit due to the contact between the orifice plate and the explosion-proof sheet at the pressure relief of the first exhaust hole. The cap assembly of the present application can meet the insulation requirements of the orifice plate and the explosion-proof sheet. In addition, since at least part of the insulating gasket isolates between the first exhaust hole of the orifice plate and the explosion-proof sheet, the friction force between the insulating gasket and the orifice plate or the explosion-proof sheet increases, and the rotation or movement of the insulating gasket is further restricted during the battery safety test, thereby reducing the possibility of short circuit caused by the movement of the insulating gasket. The present application also provides a battery including the above cap assembly, which has the above beneficial effects.

[0076] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cap assembly, applied to a battery, characterized in that: The cap assembly comprises: A perforated plate, wherein a first exhaust hole is formed on the perforated plate; burst disks; and An insulating gasket is arranged between the orifice plate and the explosion-proof plate, and a central hole is opened on the insulating gasket; Part of the explosion-proof sheets are passed through the central hole and abut against the orifice plate, and the orthographic projections of part of the insulating gaskets on the orifice plate are located in the first exhaust hole.

2. The cap assembly according to claim 1, characterized in that: The insulating gasket is provided with a second exhaust hole which penetrates axially, the second exhaust hole is located on the peripheral side of the central hole, the orthographic projection of the second exhaust hole on the orifice plate is located inside the first exhaust hole, and the second exhaust hole is connected to the first exhaust hole.

3. The cap assembly according to claim 2, characterized in that: There are a plurality of first exhaust holes, and the plurality of first exhaust holes are rotationally symmetrical about the center of the orifice plate; There are a plurality of the second exhaust holes, the plurality of the second exhaust holes are rotationally symmetrical about the center of the insulating gasket, and a spacing between two adjacent second exhaust holes is greater than a spacing between two adjacent first exhaust holes.

4. The cap assembly according to claim 2, characterized in that: One first exhaust hole corresponds to two second exhaust holes. In the orthographic projection of the orifice plate, the two second exhaust holes are distributed on both sides of the center line of the corresponding first exhaust hole and are arranged symmetrically about the center line of the first exhaust hole.

5. The cap assembly according to claim 4, characterized in that: There are a plurality of second exhaust holes, and the plurality of second exhaust holes are rotationally symmetrical about the center of the insulating gasket; There are a plurality of first exhaust holes, and the plurality of first exhaust holes are rotationally symmetrical about the center of the orifice plate; The rotation angle between two adjacent second exhaust holes is 1 / 2 of the rotation angle between two adjacent first exhaust holes.

6. The cap assembly according to claim 2, characterized in that: One of the first exhaust holes corresponds to one of the second exhaust holes. The first exhaust hole has the same shape as the second exhaust hole and is coaxially arranged. The inner diameter of the second exhaust hole is smaller than the inner diameter of the first exhaust hole.

7. The cap assembly according to any one of claims 1 to 6, characterized in that: In the orthographic projection of the orifice plate, a ratio of a total area of ​​the second exhaust holes located within a first exhaust hole to an area of ​​the first exhaust hole is 2:5 to 4:

5.

8. The cap assembly according to any one of claims 2 to 6, characterized in that: The distance between the hole wall of the second exhaust hole and the hole wall of the first exhaust hole is greater than or equal to 0.2 mm.

9. The cap assembly according to any one of claims 2 to 6, characterized in that: A surface of the explosion-proof disk facing away from the orifice plate is provided with a score line, and the score line is located within the orthographic projection of the second exhaust hole on the explosion-proof disk.

10. The cap assembly according to any one of claims 1 to 6, characterized in that: The explosion-proof disk comprises a main body and a raised portion, wherein the raised portion is arranged on a side surface of the main body close to the orifice plate, and the raised portion passes through the central hole and abuts against the orifice plate; The insulating gasket comprises a first sub-section and a second sub-section connected to each other, the first sub-section is arranged around the outside of the second sub-section, the second exhaust hole is located in the first sub-section, and the central hole is opened in the second sub-section; Along the stacking direction of the orifice plate, the insulating gasket and the explosion-proof disk, the inner diameter of the second sub-portion increases, and the maximum inner diameter of the second sub-portion is less than or equal to the maximum diameter of the protrusion.

11. A battery, characterized in that: The invention comprises a cap assembly as claimed in any one of claims 1 to 10, and further comprises a shell and a battery cell arranged in the shell, wherein the cap assembly is assembled on the shell.

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