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 pore plate, the anti-explosion sheet is positioned on the pore plate; the pore plate gasket is located between the pore plate and the anti-explosion sheet, and the anti-explosion sheet penetrates through the pore plate gasket and is connected to the pore plate; wherein the pore plate is provided with at least one pore plate pressure relief hole, the pore plate gasket is further provided with at least one gasket pressure relief hole to be communicated with the at least one pore plate pressure relief hole, and the overlapping area of the at least one gasket pressure relief hole and the at least one pore plate pressure relief hole accounts for 60%-100% of the total cross sectional area of the at least one gasket pressure relief hole.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a cap subassembly, battery and battery package. BACKGROUND

[0002] In the related art, the cap subassembly of the cylindrical lithium ion secondary battery includes a hole plate, a rupture disc and a hole plate gasket arranged between the hole plate and the rupture disc, a plurality of hole plate pressure relief holes are arranged on the hole plate, a hole plate connecting bridge is arranged between adjacent two hole plate pressure relief holes, at least one gasket pressure relief hole is arranged on the hole plate gasket, the pressure relief area of the cap subassembly is affected by the structure of the hole plate gasket pressure relief hole, the structure of the hole plate pressure relief hole and the structure of the hole plate connecting bridge, increasing the size of the hole plate gasket pressure relief hole and the size of the hole plate pressure relief hole is beneficial to increasing the pressure relief area, but it will cause the cross-sectional area of the hole plate connecting bridge connecting the hole plate pressure relief hole to be small, thereby causing the hole plate to be insufficient in strength and to be deformed, and causing the hole plate to be easily connected with the rupture disc again after being deformed during the pressure relief turning process of the rupture disc, thereby causing the internal circuit of the battery to be unable to be formed, and thereby affecting the safety performance of the battery. SUMMARY

[0003] Embodiments of the utility model provide a cap subassembly, battery and battery package, and the technical problem that the hole plate is easily deformed can be improved.

[0004] In a first aspect, embodiments of the utility model provide a cap subassembly, and the cap subassembly includes:

[0005] A hole plate;

[0006] A rupture disc located above the hole plate; and

[0007] A hole plate gasket located between the hole plate and the rupture disc, the rupture disc passes through the hole plate gasket and is connected to the hole plate;

[0008] Wherein, the hole plate is provided with at least one hole plate pressure relief hole, and the hole plate gasket is further provided with at least one gasket pressure relief hole to communicate with at least one hole plate pressure relief hole, and the overlapping area of at least one gasket pressure relief hole and at least one hole plate pressure relief hole accounts for 60% to 100% of the total cross-sectional area of at least one gasket pressure relief hole.

[0009] In some embodiments, the overlapping area of at least one gasket pressure relief hole and at least one hole plate pressure relief hole is 10mm 2 to 25mm 2 .

[0010] In some embodiments, the gasket further comprises at least one gasket bridge, each of the gasket bridges is connected between two adjacent gasket relief holes, and the overlapping area is not less than the sum of cross-sectional areas of the at least one gasket relief hole minus the sum of orthographic projection areas of the at least one gasket bridge in the at least one gasket relief hole.

[0011] In some embodiments, the number of the gasket relief holes is equal to the number of the plate relief holes, the cross-sectional area of each of the gasket relief holes is not less than the cross-sectional area of the corresponding plate relief hole, and the overlapping area is not greater than the sum of cross-sectional areas of the at least one gasket relief hole.

[0012] In some embodiments, the number of the gasket relief holes and the number of the plate relief holes are both three, and the percentage of the overlapping area of the three gasket relief holes and the three plate relief holes to the total cross-sectional area of the three gasket relief holes is 62.8% to 100%.

[0013] In some embodiments, the number of the gasket relief holes and the number of the plate relief holes are both five, and the percentage of the overlapping area of the five gasket relief holes and the five plate relief holes to the total cross-sectional area of the five gasket relief holes is 82.4% to 100%.

[0014] In some embodiments, the minimum overlapping area between the three gasket relief holes and the three plate relief holes is S1, and the minimum overlapping area between the five gasket relief holes and the five plate relief holes is S2, wherein S1 is greater than S2.

[0015] In some embodiments, the plate relief holes are arranged in a plurality, the number of the gasket relief holes is one, and the overlapping area is equal to the sum of cross-sectional areas of the plurality of plate relief holes.

[0016] In some embodiments, the plate relief holes are arranged in a mesh, the plate further comprises a plurality of plate bridges, each of the plate bridges is connected between two adjacent plate relief holes, and the orthographic projection of the plurality of plate relief holes and the plurality of plate bridges on the gasket is located in the gasket relief hole.

[0017] In some embodiments, the rupture disc is connected to the plate through the gasket relief hole.

[0018] In a second aspect, embodiments of the utility model provide a battery, the battery comprises a shell and a cap assembly connected to one end of the shell, and the cap assembly is arranged as the above cap assembly.

[0019] In a third aspect, the embodiments of the utility model provide a battery pack, the battery pack includes a box body and a plurality of batteries arranged in the box body, the battery is arranged as the battery.

[0020] The embodiments of the utility model have the advantages of:

[0021] In the embodiments of the utility model, the inventor finds through research that the pressure relief area of the cap assembly between the hole plate gasket and the hole plate is equal to the overlapping area of the gasket pressure relief hole and the hole plate pressure relief hole, when the percentage of the overlapping area of the gasket pressure relief hole and the hole plate pressure relief hole in the total cross-sectional area of the gasket pressure relief hole is 60% to 100%, the cap assembly has a suitable pressure relief area between the hole plate gasket and the hole plate while making the hole plate have a suitable structural strength. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for the person skilled in the art.

[0023] Figure 1 It is the cross-sectional view of the cap assembly provided by an embodiment of the utility model;

[0024] Figure 2 It is the cross-sectional view of the cap assembly provided by another embodiment of the utility model;

[0025] Figure 3 It is the cross-sectional view of the assembled hole plate and hole plate gasket provided by the first embodiment of the utility model;

[0026] Figure 4 It is the top view of the assembled hole plate and hole plate gasket provided by the first embodiment of the utility model;

[0027] Figure 5 It is the exploded view of the hole plate and hole plate gasket provided by the first embodiment of the utility model;

[0028] Figure 6 It is the top view of the assembled hole plate and hole plate gasket provided by the second embodiment of the utility model;

[0029] Figure 7 It is the exploded view of the hole plate and hole plate gasket provided by the second embodiment of the utility model;

[0030] Figure 8 It is the top view of the hole plate provided by the third embodiment of the utility model;

[0031] Figure 9is a top view of the orifice plate gasket provided by the third embodiment of the present application;

[0032] 10, cap assembly;

[0033] 1, top cover; 11, top cover pressure relief hole;

[0034] 2, rupture disc; 21, score; 22, boss portion;

[0035] 3, orifice plate gasket; 31, gasket pressure relief hole; 32, through hole; 33, gasket bridge;

[0036] 4, orifice plate; 41, orifice plate pressure relief hole; 411, first circle pressure relief hole; 412, second circle pressure relief hole; 42, orifice plate score; 43, orifice plate welding area; 44, orifice plate bridge;

[0037] 5, insulating sleeve. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing in the drawings. And "inner" and "outer" refer to the outline of the device.

[0039] In the related art, the cap assembly of the cylindrical lithium ion secondary battery includes an orifice plate, a rupture disc, and an orifice plate gasket arranged between the orifice plate and the rupture disc. A plurality of orifice plate pressure relief holes are arranged on the orifice plate, and an orifice plate bridge is arranged between adjacent two orifice plate pressure relief holes. At least one gasket pressure relief hole is arranged on the orifice plate gasket. The pressure relief area of the cap assembly is affected by the structure of the orifice plate gasket pressure relief hole, the structure of the orifice plate pressure relief hole, and the structure of the orifice plate bridge. Increasing the size of the orifice plate gasket pressure relief hole and the size of the orifice plate pressure relief hole is beneficial to increasing the pressure relief area, but it will cause the cross-sectional area of the orifice plate bridge connecting the orifice plate pressure relief holes to be small, which in turn causes the orifice plate to be insufficient in strength and to be deformed, and causes the orifice plate to be easily connected with the rupture disc again after being deformed during the pressure relief and turning process of the rupture disc, which in turn causes the internal circuit of the battery to be unable to be broken, and thus affects the safety performance of the battery.

[0040] In the embodiments of the present application, a cap assembly 10 is provided, as shown in Figure 1 and Figure 2As shown, the cap assembly 10 includes a top cover 1, a rupture disc 2, a hole plate gasket 3, a hole plate 4, and an insulating sleeve 5, wherein the top cover 1, the rupture disc 2, the hole plate gasket 3, and the hole plate 4 are sequentially stacked from top to bottom, the top cover 1, the rupture disc 2, the hole plate gasket 3, and the hole plate 4 are all arranged inside the insulating sleeve 5, the hole plate gasket 3 is arranged between the rupture disc 2 and the hole plate 4, and is used to prevent the hole plate 4 and the rupture disc 2 from being connected except for the welding area.

[0041] The hole plate 4 includes a hole plate welding area 43, the center of the rupture disc 2 is provided with a boss portion 22 protruding towards one side of the hole plate 4, and the center of the hole plate gasket 3 is provided with a through hole structure, the boss portion 22 of the rupture disc 2 is welded on the hole plate welding area 43 through the through hole structure.

[0042] The cap assembly 10 includes an explosion-proof structure, which includes a plurality of top cover pressure relief holes 11 arranged on the top cover 1, a rupture disc notch 21 arranged on the rupture disc 2, a plurality of gasket pressure relief holes 31 arranged on the hole plate gasket 3, and a plurality of hole plate pressure relief holes 41 arranged on the outer circumferential side of the hole plate welding area 43 of the hole plate 4, the high-pressure gas flow generated inside the battery sequentially passes through the hole plate pressure relief hole 41 and the gasket pressure relief hole 31 and acts on the rupture disc 2, so that the rupture disc 2 is turned towards the side close to the top cover 1 and the rupture disc 2 is disconnected from the hole plate gasket 3. When the high-pressure gas flow inside the battery continues to increase, the residual wall thickness of the part where the rupture disc notch 21 of the rupture disc 2 is located is broken, and the high-pressure gas flow sequentially passes through the hole plate pressure relief hole 41, the gasket pressure relief hole 31, the rupture disc notch 21 crack of the rupture disc 2, and the top cover pressure relief hole 11 and is discharged.

[0043] The pressure relief area of the cap assembly 10 at the hole plate 4 and the hole plate gasket 3 is equal to the overlapping area of the hole plate pressure relief hole 41 and the gasket pressure relief hole 31. In some embodiments, when the hole plate pressure relief hole 41 and the gasket pressure relief hole 31 are both provided as a plurality of waist-shaped holes, a hole plate connecting bridge 44 is arranged between two adjacent hole plate pressure relief holes 41, and a gasket connecting bridge 33 is arranged between two adjacent gasket pressure relief holes 31. The actual pressure relief area of the cap assembly 10 at the hole plate 4 and the hole plate gasket 3 is affected by the total cross-sectional area of the plurality of gasket pressure relief holes 31 and the cross-sectional area of the plurality of hole plate connecting bridges 44. It can be understood that increasing the total cross-sectional area of the plurality of gasket pressure relief holes 31 is conducive to increasing the actual pressure relief area but is not conducive to maintaining the structural strength of the hole plate gasket 3, and reducing the cross-sectional area of the hole plate connecting bridge 44 is conducive to increasing the actual pressure relief area but is not conducive to maintaining the structural strength of the hole plate 4. In the embodiments of the present application, the inventors have found through research on cylindrical batteries that when the overlapping area between the plurality of gasket pressure relief holes 31 and the plurality of hole plate pressure relief holes 41 accounts for 60% to 100% of the total cross-sectional area of the plurality of gasket pressure relief holes 31, the cap assembly 10 has a suitable pressure relief area between the hole plate 4 and the hole plate gasket 3, while the structural strength of the hole plate 4 is maintained. When the overlapping area between the plurality of gasket pressure relief holes 31 and the plurality of hole plate pressure relief holes 41 accounts for less than 60% of the total cross-sectional area of the plurality of gasket pressure relief holes 31, the pressure relief performance of the battery is affected.

[0044] In some embodiments, the overlapping area of the plurality of hole plate pressure relief holes 41 and the plurality of gasket pressure relief holes 31 is 10mm 2 to 25mm 2 . The inventors have found through research that when the overlapping area of the hole plate pressure relief hole 41 and the gasket pressure relief hole 31 is less than 10mm 2 , the pressure relief capacity of the battery is small, thereby affecting the safety performance of the battery. When the overlapping area of the hole plate pressure relief hole 41 and the gasket pressure relief hole 31 is greater than 25mm 2 , the cross-sectional area of the hole plate pressure relief hole 41 and the gasket pressure relief hole 31 is too large, thereby causing the hole plate 4 to be insufficient in strength and easy to deform, which affects the battery circuit breaking during the flipping of the rupture disc 2. Thus, when the overlapping area of the hole plate pressure relief hole 41 and the gasket pressure relief hole 31 is 10mm 2 to 25mm 2 , the cap assembly 10 has sufficient pressure relief area, and the hole plate 4 has suitable structural strength and is not easy to deform.

[0045] In some embodiments, both the orifice plate pressure relief holes 41 and the gasket pressure relief holes 31 are configured as oblong holes, with 2 to 5 orifice plate pressure relief holes 41 and 2 to 5 orifice plate connecting bridges 44. When the orifice plate pressure relief holes 41 are configured as oblong holes, the corresponding orifice plate connecting bridges 44 are configured as fan-shaped structures. Correspondingly, the gasket pressure relief holes 31 are configured as oblong holes, with 2 to 5 gasket pressure relief holes 31 and 2 to 5 gasket connecting bridges 33, which are configured as fan-shaped structures.

[0046] The gasket 3 also includes a through hole 32, and multiple gasket pressure relief holes 31 are provided on the outside of the through hole 32. The explosion-proof sheet 2 is welded to the orifice plate welding area 43 of the orifice plate 4 through the through hole 32.

[0047] The cross-sectional area of ​​each gasket pressure relief hole 31 is set to be no less than the cross-sectional area of ​​the corresponding orifice plate pressure relief hole 41. During the assembly of the orifice plate gasket 3 and orifice plate 4, if the gasket pressure relief hole 31 and the orifice plate pressure relief hole 41 are set to be perfectly aligned, such as... Figure 1 As shown, the overlapping area of ​​the gasket pressure relief hole 31 and the orifice plate pressure relief hole 41 is set to the maximum at this time, that is, the overlapping area of ​​the gasket pressure relief hole 31 and the orifice plate pressure relief hole 41 is not greater than the sum of the areas of multiple gasket pressure relief holes 31.

[0048] During the assembly of the orifice plate gasket 3 and the orifice plate 4, if the gasket pressure relief hole 31 and the orifice plate pressure relief hole 41 are set to be at least partially offset, such as Figure 2 and Figure 3 As shown, at this time, the overlapping area of ​​the gasket pressure relief hole 31 and the orifice plate pressure relief hole 41 is equal to the sum of the cross-sectional areas of the multiple gasket pressure relief holes 31 minus the orthogonal projection area of ​​at least one orifice plate bridge 44 within the multiple gasket pressure relief holes 31. Figure 3 and Figure 4 As shown, when the orthogonal projections of multiple orifice plate bridges 44 onto the orifice plate gasket 3 are all located within multiple gasket pressure relief holes 31, the overlapping area of ​​the gasket pressure relief holes 31 and the orifice plate pressure relief holes 41 is minimized. That is, the overlapping area of ​​the gasket pressure relief holes 31 and the orifice plate pressure relief holes 41 is equal to the sum of the cross-sectional areas of multiple gasket pressure relief holes 31 minus the sum of the orthogonal projection areas of multiple orifice plate bridges 44 within multiple gasket pressure relief holes 31.

[0049] In the embodiments of this application, 10mm 2 ≤S min <Smax≤25mm 2 , of which S min Smax represents the minimum overlapping area, and Smax represents the maximum overlapping area. In specific implementations, the overlapping area between the gasket pressure relief hole 31 and the orifice plate pressure relief hole 41 can be 10 mm. 2 12mm 2 15mm 2 18mm 2 20mm2 21mm 2 22mm 2 25mm 2 and any two of the above values, or a range between any two of the above values.

[0050] In the embodiment one provided in the present application, referring to Figure 4 and Figure 5 The number of the hole plate pressure relief holes 41 is five, and the number of the gasket pressure relief holes 31 is five. The five hole plate pressure relief holes 41 are located in a ring area of the hole plate 4, and the five gasket pressure relief holes 31 are located in a ring area of the hole plate gasket 3. The ring area where the five gasket pressure relief holes 31 are located has the same cross-sectional area as the ring area where the five hole plate pressure relief holes 41 are located. Taking the 18650 cylindrical battery as an example, the outer diameter of the hole plate gasket 3 is 14mm-16mm, and the ring area where the five gasket pressure relief holes 31 are located is set as a ring area with a diameter of 8mm-12mm from the center of the hole plate gasket 3. It can be understood that when the outer diameter size of the battery cap assembly 10 remains fixed, the outer diameter of the hole plate gasket 3 remains unchanged. If the diameter of the ring area where the gasket pressure relief hole 31 is located from the center of the hole plate gasket 3 is greater than 12mm, it will cause the edge of the gasket pressure relief hole 31 to be too close to the outer edge of the hole plate gasket 3, thereby affecting the insulation effect of the outer edge of the hole plate gasket 3 on the rupture disc 2 and the hole plate 4. If the diameter of the ring area where the gasket pressure relief hole 31 is located from the center of the hole plate gasket 3 is less than 8mm, it will affect the size of the through hole 32 at the center of the hole plate gasket 3, and further affect the welding between the rupture disc 2 and the hole plate 4.

[0051] When the five hole plate pressure relief holes 41 and the five gasket pressure relief holes 31 are completely opposite, the overlapping area of the five gasket pressure relief holes 31 and the five hole plate pressure relief holes 41 is the largest, and the largest overlapping area is set to be not greater than 17mm 2 When the five hole plate pressure relief holes 41 and the five gasket pressure relief holes 31 are at least partially staggered, the orthographic projection of at least a part of at least one of the five hole plate connecting bridges 44 connecting the five hole plate pressure relief holes 41 is located in the gasket pressure relief hole 31. When the orthographic projection of the five hole plate connecting bridges 44 on the hole plate gasket 3 is completely located in the gasket pressure relief hole 31, the overlapping area between the five gasket pressure relief holes 31 and the five hole plate pressure relief holes 41 is the smallest, and the smallest overlapping area is set to be not less than 10mm 2The overlapping area of the five gasket relief holes 31 and the five plate relief holes 41 accounts for 82.4% to 100% of the total cross-sectional area of the five gasket relief holes 31. When the orthographic projection of the five plate bridges 44 connected between the five plate relief holes 41 on the plate gasket 3 is completely located in the five gasket relief holes 31, the overlapping area of the five gasket relief holes 31 and the five plate relief holes 41 accounts for 82.4% of the total cross-sectional area of the five gasket relief holes 31. When the five plate bridges 44 connected between the five plate relief holes 41 are completely staggered with the five gasket relief holes 31, the overlapping area of the five gasket relief holes 31 and the five plate relief holes 41 accounts for 100% of the total cross-sectional area of the five gasket relief holes 31.

[0052] In the second embodiment provided in the present application, referring to Figure 6 and Figure 7 The number of plate relief holes 41 is three, and the number of gasket relief holes 31 is three. The three plate relief holes 41 are located in an annular region of the plate 4, and the three gasket relief holes 31 are located in an annular region of the plate gasket 3. The annular region where the three gasket relief holes 31 are located has the same cross-sectional area as the annular region where the three plate relief holes 41 are located. Taking a 18650 cylindrical battery as an example, the outer diameter of the plate gasket 3 is 14mm to 16mm, and the annular region where the three gasket relief holes 31 are located is set as an annular region with a diameter of 8mm to 12mm from the center of the plate gasket 3.

[0053] When the three plate relief holes 41 and the three gasket relief holes 31 are completely arranged opposite to each other, the overlapping area of the three gasket relief holes 31 and the three plate relief holes 41 is the largest. The maximum overlapping area is set to be not more than 22mm 2 When the three plate relief holes 41 and the three gasket relief holes 31 are at least partially staggered, at least a part of at least one of the three plate bridges 44 connected between the three plate relief holes 41 is located in the gasket relief hole 31. When the orthographic projection of the three plate bridges 44 on the plate gasket 3 is completely located in the gasket relief hole 31, the overlapping area between the three gasket relief holes 31 and the three plate relief holes 41 is the smallest. The minimum overlapping area is set to be not more than 17mm 2 .

[0054] When the orthographic projection of the three plate bridges 44 on the plate gasket 3 is completely located in the three gasket relief holes 31, the overlapping area between the three gasket relief holes 31 and the three plate relief holes 41 accounts for 62.8% of the total cross-sectional area of the three gasket relief holes 31. When the three plate bridges 44 are completely staggered with the three gasket relief holes 31, the overlapping area between the three gasket relief holes 31 and the three plate relief holes 41 accounts for 100% of the total cross-sectional area of the three gasket relief holes 31.

[0055] It can be understood that, compared with the five gasket relief holes 31, the three gasket relief holes 31 have three gasket bridges 33 connecting the three gasket relief holes 31, and the five gasket relief holes 31 have five gasket bridges 33 connecting the five gasket relief holes 31. Therefore, the minimum overlapping area S1 of the three gasket relief holes 31 and the three plate relief holes 41 is obviously larger than the minimum overlapping area S2 of the five gasket relief holes 31 and the five plate relief holes 41, which is conducive to improving the pressure relief capacity of the cap assembly 10.

[0056] In the third embodiment provided in the present application, referring to Figure 8 and Figure 9 , the number of plate relief holes 41 is set to be multiple, and the number of gasket relief holes 31 is one. The gasket relief hole 31 is set to be a circular hole, and the overlapping area of one gasket relief hole 31 and multiple plate relief holes 41 is equal to the sum of the cross-sectional areas of the multiple plate relief holes 41.

[0057] The multiple plate relief holes 41 are set to be grid-shaped, and the plate 4 further comprises multiple plate bridges 44, each plate bridge 44 connecting two adjacent plate relief holes 41. The orthographic projection of the multiple plate relief holes 41 and the multiple plate bridges 44 on the gasket 3 is located in the gasket relief hole 31.

[0058] The multiple plate relief holes 41 are set to be multiple circles, and the number of plate relief holes in each circle is the same, and the number of plate relief holes in each circle is not less than 3, as shown in Figure 8 , the number of plate relief holes in each circle is 8. The shape of each plate relief hole can be trapezoidal, annular, sector, circular or square.

[0059] The multiple circles of plate relief holes comprise adjacent first circle of plate relief holes 411 and second circle of plate relief holes 412, and the second circle of plate relief holes 412 is arranged around the first circle of plate relief holes 411. The number of plate relief holes in each circle is the same. The first circle of plate relief holes 411 comprises a first plate relief hole bridge connecting two adjacent plate relief holes, and the second circle of plate relief holes 412 comprises a second plate relief hole bridge connecting two adjacent plate relief holes 41. The plate relief holes 41 of the first circle of plate relief holes 411 and the plate relief holes 41 of the second circle of plate relief holes 412 are set to be one-to-one corresponding, and the first plate relief hole bridge and the second plate relief hole bridge are connected. It can be understood that the plate relief holes 41 of the first circle of plate relief holes 411 are closer to the center of the plate 4 relative to the plate relief holes 41 of the second circle of plate relief holes 412, and correspondingly, the size of the holes of the first circle of plate relief holes 411 is smaller than the size of the holes of the second circle of plate relief holes 412.

[0060] By setting the hole plate pressure relief holes 41 in a grid shape, when the cross-sectional area of the annular area where the plurality of hole plate pressure relief holes 41 are located remains fixed, the number of the grid-shaped hole plate pressure relief holes 41 increases, and correspondingly, the number of the hole plate connecting bridges 44 increases, which is further conducive to improving the structural strength of the hole plate 4 and preventing the hole plate 4 from deforming.

[0061] When the gasket pressure relief hole 31 is set as a circular hole, the rupture disc 2 is connected to the hole plate 4 through the gasket pressure relief hole 31.

[0062] Embodiments of the present application also provide a battery, which can be a cylindrical lithium ion battery or a cylindrical nickel-hydrogen battery. The battery comprises a shell and a cap assembly, which can be the cap assembly provided in the above embodiments.

[0063] Embodiments of the present application also provide a battery pack, which can be a power battery pack or an energy storage battery pack. The battery pack comprises a box body and a plurality of batteries accommodated in the box body, and the batteries comprise the batteries provided in the above embodiments.

[0064] The above has carried on the detailed introduction to the embodiments of the present application, and the principle and implementation mode of the present application are described by applying specific examples in this paper. The above embodiment description is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A cap assembly, characterized by The battery comprises: a plurality of hole plates; an explosion-proof sheet located above the hole plates; and a hole plate gasket located between the hole plates and the explosion-proof sheet, the explosion-proof sheet passing through the hole plate gasket and being connected to the hole plates; wherein the hole plates are provided with at least one hole plate pressure relief hole, the hole plate gasket is further provided with at least one gasket pressure relief hole to communicate with at least one of the hole plate pressure relief holes, and the overlapping area of at least one of the gasket pressure relief holes and at least one of the hole plate pressure relief holes accounts for 60% to 100% of the total cross-sectional area of at least one of the gasket pressure relief holes. The hole plates further comprise at least one hole plate connecting bridge, each of the hole plate connecting bridges being connected between two adjacent hole plate pressure relief holes, and the overlapping area is not less than the area obtained by subtracting the sum of the orthogonal projection areas of the at least one hole plate connecting bridge in the at least one gasket pressure relief hole from the sum of the cross-sectional areas of the at least one gasket pressure relief hole.

2. The cap assembly of claim 1, wherein The coinciding area of at least one said gasket relief hole and at least one said hole plate relief hole is 10mm 2 ~ 25mm 2 .

3. The cap assembly of claim 1, wherein The number of the gasket pressure relief holes is equal to the number of the hole plate pressure relief holes, the cross-sectional area of each of the gasket pressure relief holes is not less than the cross-sectional area of the corresponding hole plate pressure relief hole, and the overlapping area is not greater than the sum of the cross-sectional areas of the at least one gasket pressure relief hole.

4. The cap assembly of claim 3, wherein The number of the gasket pressure relief holes and the number of the hole plate pressure relief holes are both three, and the overlapping area of the three gasket pressure relief holes and the three hole plate pressure relief holes accounts for 62.8% to 100% of the total cross-sectional area of the three gasket pressure relief holes.

5. The cap assembly of any one of claims 1-4, wherein, The number of the gasket pressure relief holes and the number of the hole plate pressure relief holes are both five, and the overlapping area of the five gasket pressure relief holes and the five hole plate pressure relief holes accounts for 82.4% to 100% of the total cross-sectional area of the five gasket pressure relief holes.

6. The cap assembly of any one of claims 1 to 4, wherein, The minimum overlapping area between the three gasket pressure relief holes and the three hole plate pressure relief holes is S1, and the minimum overlapping area between the five gasket pressure relief holes and the five hole plate pressure relief holes is S2, wherein S1 is greater than S2.

7. The cap assembly of any one of claims 1 to 4, wherein, The hole plate pressure relief holes are provided in a plurality, the number of the gasket pressure relief holes is one, and the overlapping area is equal to the sum of the cross-sectional areas of the plurality of hole plate pressure relief holes.

8. The cap assembly of claim 1, wherein, The plurality of hole plate pressure relief holes are provided in a mesh shape, the hole plates further comprise a plurality of hole plate connecting bridges, each of the hole plate connecting bridges being connected between two adjacent hole plate pressure relief holes, and the orthogonal projections of the plurality of hole plate pressure relief holes and the plurality of hole plate connecting bridges on the hole plate gasket are all located in the gasket pressure relief hole.

9. The cap assembly of claim 8, wherein, The explosion-proof sheet is connected to the hole plates through the gasket pressure relief hole.

10. The cap assembly of claim 9, wherein, The battery comprises a shell and a cap assembly connected to one end of the shell, and the cap assembly is provided as the cap assembly according to any one of claims 1 to 10.

11. A battery, characterized by The battery pack comprises a box body and a plurality of batteries provided in the box body, and the batteries are provided as the battery according to claim 11.

12. A battery pack, characterized by, ​

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