Battery and battery pack

Abstract

The utility model discloses a battery and a battery pack, the battery comprises a cap assembly and a shell, the cap assembly comprises a sealing structure, the sealing structure is provided with a sealing inner cavity, and a top cover, an anti-explosion sheet, a pore plate gasket and a pore plate are sequentially arranged in the sealing inner cavity from top to bottom; the shell comprises a buckling edge and a necking structure, the buckling edge is located at the end of the shell, the necking structure is arranged close to the buckling edge, and the cap assembly is fixed between the necking structure and the buckling edge; the anti-explosion piece comprises a first vertical plate, the first vertical plate extends towards the top cover side and is attached to the side face of the top cover, the plane where the end face of the first vertical plate is located is lower than the plane where the surface, away from the anti-explosion piece, of the top cover is located, the sealing structure comprises a second sealing protrusion, and the second sealing protrusion abuts against the end face of the first vertical plate and the side face of the top cover in a sealed mode. The second sealing bulge is always abutted against the anti-explosion sheet and / or the top cover for sealing, so that the sealing performance of the battery is good, and the reliability of the battery is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery and a battery pack. BACKGROUND

[0002] Lithium ion batteries have the advantages of high energy density, fast charging and discharging, long cycle life, no pollution, etc., and have been widely applied in the fields of portable electronic devices, communication, energy storage and electric vehicles.

[0003] The cylindrical battery includes a cap structure, a shell and a battery cell, etc. The cap structure includes a top cover, a sealing element, a burst disc, etc. The burst disc is sealingly connected with the shell through the sealing element. However, during the transfer, jolting and impact of the battery, a gap is formed between the burst disc and the sealing element, and dust and other impurities fall into the battery, or water is immersed, or the battery leaks, etc., which affects the reliability of the battery. UTILITARIAN CONTENT

[0004] The application provides a battery and a battery pack, which overcome the problem that impurities enter the battery or the battery leaks due to the gap between the burst disc and the sealing element in the prior art.

[0005] In a first aspect, the application provides a battery, comprising:

[0006] A cap assembly comprising a sealing structure, the sealing structure having a sealing inner cavity, the sealing inner cavity sequentially having a top cover, a burst disc, a hole plate gasket and a hole plate from top to bottom;

[0007] A shell, the shell comprising a buckle edge and a necked structure, the buckle edge being located at an end of the shell, the necked structure being arranged close to the buckle edge, and the cap assembly being fixed between the necked structure and the buckle edge;

[0008] The burst disc comprises a first vertical plate, the first vertical plate extending towards the top cover, the first vertical plate being attached to a side surface of the top cover, and an end surface of the first vertical plate being lower than a plane where a surface of the top cover away from the burst disc is located, the sealing structure comprising a second sealing protrusion, the second sealing protrusion being in abutment sealing with the end surface of the first vertical plate and the side surface of the top cover.

[0009] Optionally, a diameter of the second sealing protrusion at the sealing position with the top cover is R1, an inner diameter of the buckle edge is R2, and 1mm≤R1-R2≤1.7mm.

[0010] Optionally, the sealing structure further comprises a first sealing protrusion, the first sealing protrusion being in abutment sealing with a side surface of the burst disc away from the top cover.

[0011] Optionally, the sealing structure further comprises:

[0012] a ring-shaped body, the second sealing protrusion is arranged on the ring-shaped body, and the ring-shaped body is sealingly connected with the flange;

[0013] a supporting table, arranged at an end of the ring-shaped body away from the flange, the supporting table being connected with the ring-shaped body, the first sealing protrusion being arranged on the supporting table, and the supporting table being sealingly connected with the necked structure;

[0014] a bottom support, arranged along a radial direction of the ring-shaped body, the bottom support being connected with a side of the supporting table away from the ring-shaped body, and the ring-shaped body, the supporting table and the bottom support forming the sealed inner cavity.

[0015] Optionally, a compaction density of the first sealing protrusion on the supporting table is greater than a compaction density of other positions on the supporting table; and / or, a compaction density of the second sealing protrusion on the ring-shaped body is greater than a compaction density of other positions on the ring-shaped body.

[0016] Optionally, before the sealing structure is assembled, the second sealing protrusion satisfies at least one of the following conditions:

[0017] a width of the second sealing protrusion is L1, and 0 < L1 ≤ 1.2 mm;

[0018] a distance between the second sealing protrusion and the supporting table is L2, and 0.8 mm ≤ L2 ≤ 1.4 mm;

[0019] a height of the second sealing protrusion protruding from an inner wall of the ring-shaped body is L3, and 0.10 mm ≤ L3 ≤ 0.25 mm.

[0020] Optionally, an end of the supporting table close to the bottom support is located in a same plane as a side wall of the necked structure.

[0021] Optionally, a width of a sealing surface formed by the supporting table and the necked structure is D8, and 1.2 mm ≤ D8 ≤ 1.9 mm.

[0022] Optionally, a width of a sealing surface formed by the supporting table and the necked structure is D8, and D8 = D3 + D4 + D5,

[0023] wherein D3 is a thickness of a side wall of the ring-shaped body;

[0024] D4 is a thickness of the first vertical plate;

[0025] D5 is a distance between a plane where an edge of the top cover is located and a plane where the side wall of the necked structure is located.

[0026] Optionally, D3, D4, and D5 must satisfy at least one of the following conditions:

[0027] 0.45mm≤D3≤0.60mm;

[0028] 0.25mm≤D4≤0.30mm;

[0029] 0.5mm≤D5≤1.0mm.

[0030] Optionally, the width of the sealing surface formed by the sealing fit between the support and the constricted structure is D8, and the deformation height of the support is D7, satisfying the following formula:

[0031] D7 = 0.7452D8 + 0.0048.

[0032] Optionally, the maximum distance between the top cover and the explosion-proof sheet is D, where 1.35mm ≤ H < 2.2mm.

[0033] Optionally, the height of the top cover is H1, where 1.5mm≤H1≤2.05mm, and the height of the top cover refers to the distance between the two parallel planes that virtually abut against the two sides of the top cover.

[0034] Optionally, the top cover includes a first cover body and a second cover body connected in sequence along the radial direction of the top cover. The first cover body is attached to the explosion-proof sheet, and the second cover body protrudes to the side away from the explosion-proof sheet. The second sealing protrusion seals against the side of the first cover body.

[0035] Optionally, the height of the explosion-proof sheet is H2, wherein 0.65mm≤H2≤0.95mm.

[0036] Optionally, the explosion-proof sheet further includes a first body, a second body, and a third body connected in sequence along the radial direction of the explosion-proof sheet. A first vertical plate is disposed on the side of the first body away from the second body. Along the thickness direction of the explosion-proof sheet, the first body, the second body, and the third body are sequentially moved away from the top cover, and the first body is attached to the top cover.

[0037] Optionally, the distance between the plane on the side of the third body away from the top cover and the plane on the side of the second body away from the top cover is h, where 0.2mm≤h<0.35mm.

[0038] Optionally, the explosion-proof sheet further includes a first inclined portion, which is located between the first body and the second body and connects the first body and the second body. The top cover is provided with a first pressure relief hole, and the projection of the first pressure relief hole is located in the plane of the first inclined portion and the second body along the thickness direction of the explosion-proof sheet.

[0039] Optionally, the first inclined portion comprises a starting end and a terminal end, the starting end is closer to the first body than the terminal end, and the starting end is located between an inner wall of the top cover on a side close to the top cover edge and the top cover edge.

[0040] Optionally, the hole plate is provided with a second pressure relief hole, and the terminal end is located between an inner wall of the hole plate on a side close to the hole plate edge and the hole plate edge.

[0041] Optionally, the diameter of the circle where the terminal end is located is S2, wherein,

[0042] S2=S3+2a,

[0043] S3 is the outer diameter of the second pressure relief hole;

[0044] a is the punching edge width constant of the hole plate, and the value range of a is.

[0045] Optionally, 7.7mm≤S3≤9.8mm, and 0.3mm≤a≤0.5mm.

[0046] Optionally, the first inclined portion comprises a starting end and a terminal end, the starting end is closer to the first body than the terminal end, and the diameter of the circle where the starting end is located is S1,

[0047] 11mm≤S1≤12mm.

[0048] Optionally, the diameter of the circle where the terminal end is located is S2, and 8.3mm≤S2≤10.8mm.

[0049] Optionally, the distance between the lower surface of the first body and the lower surface of the second body is N1, and 0.15mm≤N1≤0.3mm.

[0050] Optionally, the hole plate gasket is provided with a second inclined portion, and the second inclined portion is connected with the first inclined portion.

[0051] Optionally, the hole plate is provided with a third inclined portion, and the third inclined portion is connected with the second inclined portion.

[0052] In a second aspect, the embodiments of the present application also provide a battery pack comprising the battery.

[0053] The battery and the battery pack provided by the embodiments of the present application, the battery comprises a cap assembly and a shell, the cap assembly comprises a sealing structure, the sealing structure is internally provided with a top cover, a bursting disc, a hole plate gasket and a hole plate, the shell comprises a clamping edge and a necked structure, the clamping edge and the necked structure fix the cap assembly, a first vertical plate of the bursting disc is attached to a side surface of the top cover, a second sealing protrusion is abutted and sealed to an end surface of the first vertical plate and the side surface of the top cover, the gap formed between the bursting disc and the top cover is filled by the second sealing protrusion, the problem that impurities enter the battery or the battery leaks due to the gap formed between the bursting disc and the sealing element in the prior art is overcome, even if the battery is subjected to external force, the second sealing protrusion is always abutted and sealed to the bursting disc and / or the top cover, the sealing performance of the battery is good, and the reliability of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0055] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. In the following description, the same reference numerals represent the same parts.

[0056] Figure 1 The side view of the battery provided by the embodiments of the present application.

[0057] Figure 2 The Figure 1 The A-A sectional view in the figure.

[0058] Figure 3 The Figure 2 The local enlarged view at B in the figure.

[0059] Figure 4 The Figure 3 The local enlarged view at C in the figure.

[0060] Figure 5 The perspective view of the top cover provided by the embodiments of the present application.

[0061] Figure 6 The cross-sectional schematic view of the cap assembly provided by the embodiments of the present application after assembly.

[0062] Figure 7 The annotation diagram of the bursting disc provided by the embodiments of the present application.

[0063] Figure 8 The annotation diagram of the partial structure of the battery provided by the embodiments of the present application.

[0064] Figure 9A cross-sectional view of a cap assembly before assembly is provided in the embodiments of the present application.

[0065] Reference signs in the drawings are as follows:

[0066] 1, battery; 10, cap assembly; 20, shell; 21, necked structure; 22, flange; 30, battery cell;

[0067] 100, sealing structure; 110, sealing cavity; 120, annular body; 121, second sealing protrusion; 130, support; 131, first sealing protrusion; 140, bottom support;

[0068] 200, top cover; 210, first cover body; 220, second cover body; 230, first pressure relief hole; 240, connecting portion;

[0069] 300, rupture disc; 310, first body; 320, second body; 330, third body; 340, first inclined portion; 341, starting end; 342, ending end; 350, first vertical plate;

[0070] 400, hole plate gasket; 410, second inclined portion;

[0071] 500, hole plate; 510, second pressure relief hole; 520, third inclined portion. DETAILED DESCRIPTION

[0072] The technical solutions in the embodiments of the present application will be described clearly and completely 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 other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0073] Referring to Figure 1 , Figure 2 and Figure 3 , the embodiments of the present application provide a battery 1 including a cap assembly 10, a shell 20 and a battery cell 30.

[0074] In the embodiments of the present application, referring to Figure 1 , Figure 2 and Figure 3 , the shell 20 has a cylindrical structure, one end of the shell 20 is open, the battery cell 30 is installed in the shell 20, the cap assembly 10 is sealingly connected with the shell 20, and the cap assembly 10 blocks the opening. The shell 20 includes a necked structure 21 and a flange 22. The end of the shell 20 extends inward along the radial direction of the shell 20 to form the flange 22. The flange 22 has a circular ring shape. The necked structure 21 is formed by concave inward along the radial direction of the shell 20 at a position of the shell 20 away from the flange 22 by a certain distance.

[0075] In the embodiments of the present application, referring to Figure 4 The cap assembly 10 includes a sealing structure 100, and the sealing structure 100 has a sealing inner cavity 110, in which, from top to bottom, are sequentially arranged a top cover 200, an anti-explosion sheet 300, a hole plate gasket 400 and a hole plate 500. The cap assembly 10 is fixed between the necked structure 21 and the flange 22. The sealing structure 100 is partially attached to the necked structure 21, the flange 22 and the part of the shell 20 between the necked structure 21 and the flange 22. The necked structure 21 and the flange 22 extrude the sealing structure 100 along the axial direction of the shell 20, so that the sealing structure 100 is sealingly connected to the top cover 200 and the anti-explosion sheet 300.

[0076] In the embodiments, referring to Figure 4 The anti-explosion sheet 300 includes a first vertical plate 350, which is located at the edge of the anti-explosion sheet 300. The first vertical plate 350 extends to the side of the top cover 200, and the inner side of the first vertical plate 350 is attached to the side of the top cover 200. The outer side of the first vertical plate 350 is sealingly attached to the sealing structure 100. The plane where the end surface of the first vertical plate 350 is located is lower than the plane where the surface of the top cover 200 away from the anti-explosion sheet 300 is located, that is, the end surface of the first vertical plate 350 is spaced apart from the upper surface of the top cover 200 by a certain distance. The sealing structure 100 includes a second sealing protrusion 121, which is in abutment with the end surface of the first vertical plate 350 and the side of the top cover 200.

[0077] In the embodiments of the present application, referring to Figure 8 A gap is formed between the first vertical plate 350 and the top cover 200, and the second sealing protrusion 121 fills the gap. Even if the battery is subjected to external forces such as impact and jolt, the second sealing protrusion 121 always fills the gap, ensuring the sealing performance of the battery and improving the reliability of the battery.

[0078] In some embodiments, referring to Figure 8 The diameter of the sealing position between the second sealing protrusion 121 and the top cover 200 is R1, and the inner diameter of the flange 22 is R2, and 1mm≤R1-R2≤1.7mm. The value of R1-R2 can be 1mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm or other values not listed.

[0079] In the embodiment, the outermost edge of the second sealing protrusion 121 is sealingly connected with the side surface of the top cover 200, wherein the buckle edge 22 holds the sealing structure 100, and the sealing structure 100 is sealingly connected with the top cover 200 and the explosion-proof sheet 300. If R2 < R1, the area of the sealing structure 100 held by the buckle edge 22 is small, and the holding effect is not good. When the battery is subjected to external force, the sealing structure 100 may be ejected. If R2 is much greater than R1, although the area of the sealing structure 100 held by the buckle edge 22 is large, the material cost is too high, and the assembly difficulty is increased. In the embodiment, the difference between R2 and R1 is reasonable, which can meet the drop test standard of GB 31241-2014, and the impact resistance is good.

[0080] In some embodiments, referring to Figure 9 , the sealing structure 100 further comprises a first sealing protrusion 131, which is in abutting sealing with the side of the explosion-proof sheet 300 away from the top cover 200.

[0081] In the embodiment, the first sealing protrusion 131 and the second sealing protrusion 121 jointly seal the explosion-proof sheet 300 and the top cover 200, realize double sealing of the cap assembly 10, have good sealing effect, and have high reliability.

[0082] In some embodiments, referring to Figure 9 , the sealing structure 100 further comprises an annular body 120, a supporting table 130, and a bottom support 140.

[0083] In the embodiment, the annular body 120 is in a cylindrical structure, and the second sealing protrusion 121 is arranged on the inner side wall of the annular body 120. The annular body 120 is sealingly connected with the buckle edge 22. The buckle edge 22 and the necked structure 21 jointly hold the sealing structure 100 to adapt to the shape of the shell 20 between the buckle edge 22 and the necked structure 21. The supporting table 130 is arranged at one end of the annular body 120 away from the buckle edge 22, and the supporting table 130 is connected with the annular body 120. The supporting table 130 is sealingly and tightly fitted with the side of the explosion-proof sheet 300 away from the top cover 200. The first sealing protrusion 131 is arranged on the supporting table 130, and the side of the supporting table 130 away from the explosion-proof sheet 300 is sealingly connected with the necked structure 21. The bottom support 140 extends along the radial direction of the annular body 120, and the bottom support 140 is connected with the side of the supporting table 130 away from the annular body 120. The bottom support 140 is located between the hole plate 500 and the battery cell 30. The annular body 120, the supporting table 130, and the bottom support 140 enclose the sealed inner cavity 110. In some embodiments, the annular body 120, the supporting table 130, and the bottom support 140 are integrally formed by an injection molding process, and are simple to process.

[0084] In some embodiments, when the sealing structure 100 is in the assembled state, the compaction density of the first sealing protrusion 131 on the carrier 130 is greater than the compaction density of other positions on the carrier 130. The compaction density refers to the material density of the carrier 130 at all positions when the sealing structure 100 is in the extruded state. After the sealing structure 100 is assembled, the first sealing protrusion 131 is extruded to be flush with the surface of the carrier 130. The first sealing protrusion 131 on the carrier 130 is subjected to a greater extrusion force, and the material deforms greatly after extrusion. Therefore, the compaction density of the first sealing protrusion 131 on the carrier 130 is greater than the compaction density of other positions, thereby improving the sealing effect.

[0085] In some embodiments, when the sealing structure 100 is in the assembled state, the compaction density of the second sealing protrusion 121 on the annular body 120 is greater than the compaction density of other positions on the annular body 120. The compaction density refers to the material density of the annular body 120 at all positions when the sealing structure 100 is in the extruded state. After the sealing structure 100 is assembled, the second sealing protrusion 121 is extruded to be flush with the inner side of the annular body 120. The second sealing protrusion 121 on the annular body 120 is subjected to a greater extrusion force, and the material deforms greatly after extrusion. Therefore, the compaction density of the second sealing protrusion 121 on the annular body 120 is greater than the compaction density of other positions, thereby improving the sealing effect.

[0086] In some embodiments, referring to Figure 9 , before the sealing structure 100 is assembled, the cross-sectional shape of the second sealing protrusion 121 on the cross section of the sealing structure 100 along the axial direction of the sealing structure 100 is triangular, trapezoidal, rectangular, arc-shaped, or the like. Before the sealing structure 100 is assembled, the second sealing protrusion 121 satisfies at least one of the following conditions:

[0087] (1) The width of the second sealing protrusion 121 is L1, and 0 < L1 ≤ 1.2 mm. The value of L1 can be 0.2 mm, 0.4 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.2 mm, or other values not listed. The width of the second sealing protrusion 121 refers to the distance between the two ends of the second sealing protrusion 121 connected to the annular body 120 along the axial direction of the annular body 120. For example, the distance between the end of the second sealing protrusion 121 close to the carrier 130 and the carrier 130 is L11, and the distance between the end of the second sealing protrusion 121 away from the carrier 130 and the carrier 130 is L12, wherein 0.6 mm ≤ L11 < 1.2 mm and 1.2 mm ≤ L12 ≤ 1.8 mm. The value of L11 can be 0.6 mm, 0.7 mm, 0.9 mm, 1.1 mm, or other values not listed. The value of L12 can be 1.2 mm, 1.4 mm, 1.6 mm, 1.7 mm, 1.8 mm, or other values not listed.

[0088] (2) The distance between the second sealing protrusion 121 and the support platform 130 is L2, and 0.8mm≤L2≤1.4mm. The value of L2 can be 0.8mm, 0.9mm, 1.1mm, 1.2mm, 1.4mm or other values not listed. The distance between the second sealing protrusion 121 and the support platform 130 refers to the distance between the second sealing protrusion 121 and the inner wall of the support platform 130 at the highest position of the annular body 120. For example, the cross-sectional shape of the second sealing protrusion 121 is a triangle, and L2 is the distance between the inner wall of the support platform 130 and the point of the triangle away from the support platform 130.

[0089] (3) The height of the second sealing protrusion 121 protruding from the inner wall of the annular body 120 is L3, and 0.10mm≤L3≤0.25mm. The value of L3 can be 0.10mm, 0.13mm, 0.15mm, 0.17mm, 0.18mm, 0.20mm, 0.21mm, 0.23mm, 0.24mm or other values not listed. The width of the second sealing protrusion 121 refers to the distance between the plane virtually abutting the side of the second sealing protrusion 121 away from the annular body 120 and the plane virtually abutting the inner wall of the annular body 120.

[0090] In the embodiments of the present application, after the sealing structure 100 is assembled, the size of the second sealing protrusion 121 can meet the requirement of filling the gap between the annular body 120, the top cover 200 and the explosion-proof sheet 300. The probability of poor sealing effect due to the small size of the second sealing protrusion 121 is reduced, and the probability of new gaps between the annular body 120 and the top cover 200 or the explosion-proof sheet 300 due to the large size of the second sealing protrusion 121 is reduced, thereby ensuring the sealing reliability of the sealing structure 100.

[0091] In some embodiments, referring to Figure 4 , the end of the support platform 130 close to the bottom support 140 is in the same plane as the side wall of the necked structure 21.

[0092] For example, referring to Figure 4 , the necked structure 21 includes an upper side wall, a lower side wall and an inner side wall, wherein the upper side wall and the lower side wall are oppositely spaced, the inner side wall is located between the upper side wall and the lower side wall, and the inner side wall connects the ends of the upper side wall and the lower side wall away from the edge of the shell 20. The necked structure 21 is in the form of a U-shaped groove structure. The support platform 130 is sealingly connected to the upper side wall. The end of the support platform 130 close to the bottom support 140 is in the same plane as the side wall of the necked structure 21. That is, the end of the support platform 130 close to the bottom support 140 is in the extension plane of the inner side wall of the necked structure 21.

[0093] In the embodiment of the present application, the assembled sealing structure 100 is extruded and deformed by the necking structure 21 and the edge 22, and the size of the extruded and deformed supporting table 130 is adapted to the size of the upper side wall of the necking structure 21, which ensures the sealing effect while reducing the probability of the situation that the supporting table 130 is excessively deformed to extrude the battery cell 30, thereby improving the capacity of the battery cell.

[0094] In some embodiments, referring to Figure 8 , the width of the sealing surface formed by the sealing fit between the supporting table 130 and the necking structure 21 is D8, where 1.2mm≤D8≤1.9mm. That is, the width of the sealing surface formed by the sealing fit between the supporting table 130 and the inner side wall of the necking structure 21 is D8. The value of D8 can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.9mm, or other unlisted values.

[0095] In the embodiment of the present application, the width of the sealing surface formed by the sealing fit between the supporting table 130 and the necking structure 21 ensures the sealing requirement while reducing the probability of the situation that the supporting table 130 is excessively deformed to extrude the battery cell 30 due to the large size of the sealing surface, thereby improving the capacity of the battery cell.

[0096] In some embodiments, referring to Figure 8 , the width of the sealing surface formed by the sealing fit between the supporting table 130 and the necking structure 21 is D8, which satisfies formula (1):

[0097] D8=D3+D4+D5 (1);

[0098] where D3 is the side wall thickness of the annular body 120;

[0099] D4 is the thickness of the first vertical plate 350;

[0100] D5 is the distance between the plane where the edge of the top cover 200 is located and the plane where the side wall of the necking structure 21 is located. That is, the horizontal distance between the plane where the edge of the top cover 200 is located and the plane where the inner side wall of the necking structure 21 is located.

[0101] In the embodiment of the present application, the width D8 of the sealing surface is related to the side wall thickness D3 of the annular body 120, the thickness D4 of the first vertical plate 350, and the distance D5 between the plane where the edge of the top cover 200 is located and the plane where the side wall of the necking structure 21 is located, that is, the width D8 of the sealing surface is related to the size of the inner side wall of the necking structure 21. This reduces the probability of the situation that the supporting table 130 interferes with the necking structure 21 due to the small size of the sealing surface and the small size of the supporting table 130, and reduces the probability of the situation that the supporting table 130 is excessively deformed to extrude the battery cell 30 due to the large size of the sealing surface.

[0102] In some embodiments, D3, D4, and D5 at least satisfy one of the following conditions:

[0103] (1), 0.45mm≤D3≤0.60mm, wherein the value of D3 can be 0.45mm, 0.49mm, 0.52mm, 0.55mm, 0.57mm, 0.58mm, 0.59mm, 0.6mm or other unlisted values;

[0104] (2), 0.25mm≤D4≤0.30mm, wherein the value of D4 can be 0.25mm, 0.26mm, 0.28mm, 0.29mm, 0.30mm or other unlisted values;

[0105] (3), 0.5mm≤D5≤1.0mm, wherein the value of D5 can be 0.5mm, 0.6mm, 0.8mm, 0.9mm, 1.0mm or other unlisted values.

[0106] In the embodiments of the present application, the size design of D3, D4 and D5 can meet the width design requirement of the sealing surface and ensure the sealing effect.

[0107] In some embodiments, referring to Figure 6 and Figure 8 , the width of the sealing surface formed by the sealing fit of the support table 130 and the necked structure 21 is D8, and the deformation height of the support table 130 is D7, wherein the deformation height D7 of the support table 130 refers to the vertical distance between one end of the support table 130 close to the annular body 120 and the other end along the axial direction of the annular body 120. Wherein D8 and D7 satisfy formula (2):

[0108] D7=0.7452D8+0.0048 (2).

[0109] In the embodiments of the present application, the linear relationship between the width of the sealing surface and the deformation height of the support table 130 satisfies formula (2). The width of the sealing surface is the same as the radial dimension of the upper side wall of the necked structure 21, and when designing the product, the size of the upper side wall of the necked structure 21 can be directly obtained, and the size of the support table 130 can be obtained by substituting formula (2), and in combination with the compression deformation amount of the sealing structure 100, the size of the sealing structure 100 can be designed. It is beneficial to product design.

[0110] In some embodiments, referring to Figure 6The maximum distance between the top cover 200 and the explosion-proof sheet 300 is H, and 1.35mm≤H<2.2mm. The value of D can be 1.35mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm or other values not listed. The maximum distance between the top cover 200 and the explosion-proof sheet 300 refers to the maximum distance between the side of the top cover 200 close to the explosion-proof sheet 300 and the side of the explosion-proof sheet 300 close to the top cover 200 along the battery axial direction.

[0111] In the embodiment of the present application, the size design of the maximum distance D between the top cover 200 and the explosion-proof sheet 300 can meet the required space for the explosion-proof sheet 300 to flip up after explosion, and the height of the cap assembly 10 is reduced as much as possible. In the case of a certain battery height, the smaller the height of the cap assembly 10, the larger the space that can be occupied by the battery cell 30, which is beneficial to improve the battery capacity.

[0112] In some embodiments, referring to Figure 6 The height of the top cover 200 is H1, and 1.5mm≤H1≤2.05mm. The height of the top cover 200 refers to the distance between the two parallel planes virtually abutting the two sides of the top cover 200. The value of H1 can be 1.5mm, 1.6mm, 1.75mm, 1.7mm, 1.9mm, 2.0mm, 2.05mm or other values not listed.

[0113] In the embodiment of the present application, the height of the top cover 200 is reduced to achieve the purpose of reducing the height of the cap assembly 10 and improve the space that can be occupied by the battery cell 30. The size design of the top cover 200 can meet the required space for the explosion-proof sheet 300 to flip up after explosion and the assembly requirement of the cap assembly 10.

[0114] In some embodiments, referring to Figure 5 The top cover 200 includes a first cover body 210 and a second cover body 220 connected in sequence along the radial direction of the top cover 200. The first cover body 210 is in the shape of a ring, and the first cover body 210 is in contact with the explosion-proof sheet 300. The second cover body 220 is located on the inner side of the first cover body 210, and the second cover body 220 is in the shape of a circle and protrudes from the side away from the explosion-proof sheet 300. The second sealing protrusion 121 is in sealing abutment with the side of the first cover body 210 away from the second cover body 220. In the embodiment, the first cover body 210 and the second cover body 220 can be integrally formed by stamping. The height of the top cover 200 refers to the distance between the plane in which the side of the first cover body 210 in contact with the explosion-proof sheet 300 is located and the plane in which the side of the second cover body 220 away from the explosion-proof sheet 300 is located.

[0115] In some embodiments, referring to Figure 5The first cover body 210 further comprises a connecting portion 240 located between the first cover body 210 and the second cover body 220, the inner diameter of the first cover body 210 is greater than the outer diameter of the second cover body 220, and the connecting portion 240 connects the first cover body 210 and the second cover body 220. A plurality of first pressure relief holes 230 are formed in the top cover 200 and are arranged at intervals in the circumferential direction of the top cover 200. The first pressure relief hole 230 is arranged on the connecting portion 240 and extends to the first cover body 210 and the second cover body 220.

[0116] In some embodiments, referring to Figure 6 and Figure 7 The height of the rupture disc 300 is H2, wherein 0.65mm≤H2≤0.95mm. The height of the rupture disc 300 refers to the distance between the plane where the side of the rupture disc 300 that is attached to the first cover body 210 is located and the plane where the side of the rupture disc 300 that is attached to the hole plate 500 is located. The value of H2 can be 0.65mm, 0.72mm, 0.74mm, 0.75mm, 0.80mm, 0.87mm or other values not listed.

[0117] In the embodiments of the present application, the height of the rupture disc 300 is reduced to achieve the purpose of reducing the height of the cap assembly 10 and improving the space available for the battery cell 30. The size of the top cover 200 is designed to meet the space required for the rupture disc 300 to flip up after bursting and the assembly requirements of the rupture disc 300.

[0118] In some embodiments, referring to Figure 7 The rupture disc 300 further comprises a first body 310, a second body 320 and a third body 330 connected in sequence in the radial direction of the rupture disc 300. The first vertical plate 350 is arranged on the side of the first body 310 away from the second body 320. The first body 310 and the second body 320 are annular structures, and the third body 330 is circular. In the thickness direction of the rupture disc 300, the first body 310, the second body 320 and the third body 330 are sequentially away from the top cover 200. The first body 310 is attached to the top cover 200, i.e. the first body 310 is attached to the first cover body 210. The second body 320 is provided with a rupture mark. The side of the third body 330 away from the top cover 200 is welded to the hole plate 500. The height of the rupture disc 300 refers to the vertical distance between the plane where the side of the first body 310 facing the top cover 200 is located and the plane where the side of the third body 330 away from the top cover 200 is located. The maximum distance between the top cover 200 and the rupture disc 300 refers to the vertical distance between the plane where the side of the second cover body 220 facing the rupture disc 300 is located and the plane where the side of the third body 330 facing the second cover body 220 is located.

[0119] In this embodiment, the first body 310, the second body 320 and the third body 330 of the explosion-proof disc 300 are located at different heights, increasing the material of the explosion-proof disc 300, providing the material required for the explosion-proof disc 300 to flip, and ensuring the flipping height of the explosion-proof disc 300 after explosion.

[0120] In some embodiments, see Figure 6 and Figure 7 The distance between the plane containing the side of the third body 330 facing away from the top cover 200 and the plane containing the side of the second body 320 facing away from the top cover 200 is h, where 0.2mm ≤ h < 0.35mm. The value of h can be 0.2mm, 0.24mm, 0.27mm, 0.29mm, 0.30mm, 0.32mm, 0.34mm, 0.35mm, or other unlisted values.

[0121] In this embodiment, the height of the explosion-proof sheet 300 is reduced by decreasing the distance between the plane of the third body 330 facing away from the top cover 200 and the plane of the second body 320 facing away from the top cover 200, thereby achieving the purpose of reducing the height of the cap assembly 10. Furthermore, the specifications of the first vertical plate 350, the first body 310, and the second body 320 can remain unchanged, without requiring modifications to other related components such as the perforated plate gasket 400 and the perforated plate 500, simplifying processing and assembly.

[0122] In some embodiments, see Figure 4 , Figure 6 and Figure 6 The explosion-proof sheet 300 also includes a first inclined portion 340, which is located between the first body 310 and the second body 320. The first inclined portion 340 connects the first body 310 and the second body 320. The top cover 200 is provided with a first pressure relief hole 230. Along the thickness direction of the explosion-proof sheet 300, the projection of the first pressure relief hole 230 is located in the plane of the first inclined portion 340 and the second body 320.

[0123] Compared to related technologies where the first body 310 and the second body 320 are vertically connected, the first body 310 may cover part of the first pressure relief hole 230, affecting the pressure relief effect. In this embodiment, the first body 310 and the second body 320 are connected by a first inclined portion 340. The first inclined portion 340 avoids the position of the first pressure relief hole 230, ensuring the pressure relief area of ​​the first pressure relief hole 230, reducing the venting time, and improving the safety performance of the battery.

[0124] In some embodiments, see Figure 7The first inclined portion 340 comprises a starting end 341 and an ending end 342. The starting end 341 is closer to the first body 310 than the ending end 342. The starting end 341 is located between an inner wall of the first pressure relief hole 230 close to an edge of the top cover 200 and the edge of the top cover 200.

[0125] In the embodiments of the present application, the position of the starting end 341 of the first inclined portion 340 is set between the outer edge of the first pressure relief hole 230 and the outer edge of the top cover 200, so that the first inclined portion 340 avoids the first pressure relief hole 230 and ensures the pressure relief effect.

[0126] In some embodiments, referring to Figure 6 The second pressure relief hole 510 is arranged on the hole plate 500. The ending end 342 is located between an inner wall of the second pressure relief hole 510 close to an edge of the hole plate gasket 400 and the edge of the hole plate 500.

[0127] In the embodiments of the present application, the position of the ending end 342 of the first inclined portion 340 is set between the outer edge of the second pressure relief hole 510 and the outer edge of the hole plate 500, so that the first inclined portion 340 avoids covering the second pressure relief hole 510, ensures the exhaust effect of the hole plate 500, ensures the pressure relief effect, and improves the reliability of the battery.

[0128] In some embodiments, referring to Figure 7 The first inclined portion 340 comprises a starting end 341 and an ending end 342. The starting end 341 is closer to the first body 310 than the ending end 342. The diameter of the circle where the starting end 341 is located is S1, and 11mm≤S1≤12mm. The value of S1 can be 11mm, 11.3mm, 11.5mm, 11.6mm, 11.8mm, 12mm or other values not listed.

[0129] In the embodiments of the present application, the diameter of the explosion-proof sheet 300 is adapted to the shell 20. The size of the explosion-proof sheet 300 is fixed. By limiting the diameter of the circle where the starting end 341 is located, the size of the first body 310 is indirectly determined, which is convenient for product design. When the size of S1 is less than 11mm, in order to avoid the explosion-proof sheet 300 blocking the first pressure relief hole 230, it is necessary to reduce the size of the first pressure relief hole 230, which affects the exhaust effect. If the size of S1 is greater than 12mm, the size of the first body 310 is reduced, the area of the first body 310 attached to the top cover 200 is reduced, and the assembly relationship of the first body 310 with other components is affected.

[0130] In some embodiments, referring to Figure 7 and Figure 4 The diameter of the circle where the ending end 342 is located is S2, and S2 satisfies formula (3):

[0131] S2=S3+2a (3)

[0132] Wherein, S3 is the outer diameter of the second pressure relief hole 510;

[0133] 'a' is a constant representing the punching edge width of the 500mm perforated plate, and the range of values ​​for 'a' is given.

[0134] In this embodiment, the constant width of the punched edge of the perforated plate 500 refers to the distance between the outer edge of the second pressure relief hole 510 and the inner edge of the third inclined portion 520 on the perforated plate 500.

[0135] In this embodiment, the position of the termination end 342 is determined according to formula (3) to avoid the termination end 342 covering the second pressure relief hole 510 and to ensure the pressure relief effect of the orifice plate 500. With the specifications of the orifice plate 500 unchanged, the position of the termination end 342 is determined according to formula (3), which facilitates the design of the explosion-proof sheet 300.

[0136] In some embodiments, 7.7mm≤S3≤9.8mm, 0.3mm≤a≤0.5mm.

[0137] In this embodiment, the value of S3 is 7.7mm, 7.9mm, 8.2mm, 8.5mm, 8.9mm, 9.1mm, 9.5mm, 9.8mm, or other unlisted values. If the value of S3 is less than 7.7mm, the diameter of the second pressure relief hole 510 is too small, which cannot meet the venting requirements. If the value of S3 is greater than 9.8mm, the diameter of the second pressure relief hole 510 is too large, which affects the structural strength of the orifice plate 500. The parameter design of S3 can meet the specification requirements of the second pressure relief hole 510 on the orifice plate 500, ensuring the pressure relief effect and the structural strength requirements of the orifice plate 500.

[0138] In this embodiment, the value of 'a' is 0.3mm, 0.4mm, 0.5mm, or other unlisted values. The value of 'a' is determined by the machining precision.

[0139] In some embodiments, see Figure 4 and ​ The diameter of the circle containing the termination end 342 is S2, where 8.3mm ≤ S2 ≤ 10.8mm. The value of S2 can be 8.4mm, 8.5mm, 8.7mm, 8.9mm, 9.2mm, 9.5mm, 9.7mm, 9.9mm, 10.2mm, 10.5mm, 10.8mm, or other unlisted values.

[0140] In this embodiment, if the value of the termination end 342 is small, it is not conducive to the processing and forming of the first inclined portion 340; if the value of the termination end 342 is large, it will cover the second pressure relief hole 510, affecting the pressure relief effect. In this embodiment, the diameter range of the circle containing the termination end 342 is reasonably designed.

[0141] In some embodiments, referring to ​ In some embodiments, 0.15mm≤N1≤0.3mm. Wherein, N1 is 0.15mm, 0.18mm, 0.19mm mm, 0.22mm mm, 0.25mm mm, 0.28mm, 0.3mm or other values not listed.

[0142] For example, the angle between the first inclined portion 340 and the plane where the second body 320 is located is β, which satisfies formula (4):

[0143] β = 180° - arctan[N1 / S1-S2] (4),

[0144] Wherein, N1 is the distance between the lower surface of the first body 310 and the lower surface of the second body 320;

[0145] S1 is the diameter of the circle where the starting end 341 of the first inclined portion 340 is located;

[0146] S2 is the diameter of the circle where the ending end 342 of the first inclined portion 340 is located.

[0147] In the embodiments of the present application, when the starting end 341 and the ending end 342 of the first inclined portion 340 and the distance between the lower surface of the first body 310 and the lower surface of the second body 320 are determined, the inclination angle of the first inclined portion 340 can be determined. The distance between the lower surface of the first body 310 and the lower surface of the second body 320 is designed to meet the requirements of the explosion-proof sheet 300 for the blasting upward height and the material stretching requirements of the first inclined portion 340.

[0148] In some embodiments, the orifice plate gasket 400 is provided with a second inclined portion 410, and the second inclined portion 410 is connected with the first inclined portion 340.

[0149] In the embodiments of the present application, referring to ​ The orifice plate gasket 400 is attached to the side of the explosion-proof sheet 300 away from the top cover 200, and the shape of the orifice plate gasket 400 is adapted to the shape of the explosion-proof sheet 300. The second inclined portion 410 is connected with the first inclined portion 340 to ensure the overall height of the cap assembly 10.

[0150] In some embodiments, referring to ​ The orifice plate 500 is provided with a third inclined portion 520, and the third inclined portion 520 is connected with the second inclined portion 410.

[0151] In the embodiments of the present application, the hole plate 500 is welded and fixed with the explosion-proof sheet 300, and the hole plate gasket 400 is clamped and fixed with the explosion-proof sheet 300. The first inclined portion 340, the second inclined portion 410 and the third inclined portion 520 are sequentially attached and connected, the explosion-proof sheet 300, the hole plate gasket 400 and the hole plate 500 are closely attached, the height space occupied is small, and the overall height of the cap assembly 10 is ensured.

[0152] The embodiments of the present application also provide a battery pack comprising the battery 1 of any one of the above embodiments. The battery pack of the embodiments of the present application has the same technical effects as the above battery, and details are not repeated.

[0153] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0154] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0155] The battery and battery pack provided by the embodiments of the present application are described in detail above, and the principles and implementation modes of the present application are described by applying specific examples; the above embodiment descriptions are 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, the content of the specification should not be understood as the limitation of the present application.

Claims

1. A battery (1) characterized in that, The utility model relates to a sealing structure of a cap assembly, and relates to the technical field of a cap assembly. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof.

2. The battery (1) according to claim 1, characterized in that The utility model discloses a cap assembly and a shell thereof.

3. The battery (1) according to claim 1, characterized in that The utility model discloses a cap assembly and a shell thereof.

4. The battery (1) according to claim 3, characterized in that The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof.

5. The battery (1) according to claim 4, characterized in that The utility model discloses a cap assembly and a shell thereof.

6. The battery (1) according to claim 4, characterized in that The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. The utility model discloses a cap assembly and a shell thereof. 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The utility model discloses a cap assembly and The width of the second sealing protrusion (121) is L1, 0 < L1 ≤ 1.2 mm; The distance between the second sealing protrusion (121) and the supporting platform (130) is L2, 0.8 mm ≤ L2 ≤ 1.4 mm; The height of the second sealing protrusion (121) protruding from the inner wall of the annular body (120) is L3, 0.10 mm ≤ L3 ≤ 0.25 mm.

7. The battery (1) according to claim 4, characterized in that One end of the supporting platform (130) close to the bottom support (140) is in the same plane as the sidewall of the necked structure (21).

8. The battery (1) according to claim 7, characterized in that The width of the sealing surface formed by the sealing fit between the supporting platform (130) and the necked structure (21) is D8, 1.2 mm ≤ D8 ≤ 1.9 mm.

9. The battery (1) according to claim 7, characterized in that The width of the sealing surface formed by the sealing fit between the supporting platform (130) and the necked structure (21) is D8, D8 = D3 + D4 + D5, D3 is the thickness of the sidewall of the annular body (120); D4 is the thickness of the first vertical plate (350); D5 is the distance between the plane where the edge of the top cover (200) is located and the plane where the sidewall of the necked structure (21) is located.

10. The battery (1) according to claim 9, characterized in that D3, D4 and D5 at least meet one of the following conditions: 0.45 mm ≤ D3 ≤ 0.60 mm; 0.25 mm ≤ D4 ≤ 0.30 mm; 0.5 mm ≤ D5 ≤ 1.0 mm.

11. The battery (1) according to claim 7, characterized in that The width of the sealing surface formed by the sealing fit between the supporting platform (130) and the necked structure (21) is D8, and the deformation height of the supporting platform (130) is D7, which satisfies the following formula: D7 = 0.7452D8 + 0.0048.

12. The battery (1) according to any one of claims 1 to 11, characterized in that The maximum distance between the top cover (200) and the anti-explosion sheet (300) is D, 1.35 mm ≤ H < 2.2 mm.

13. The battery of claim 12, wherein, The height of the top cover (200) is H1, 1.5 mm ≤ H1 ≤ 2.05 mm, and the height of the top cover (200) refers to the distance between the two parallel planes virtually abutting the two side surfaces of the top cover (200).

14. The battery (1) according to claim 13, characterized in that The top cover (200) comprises a first cover body (210) and a second cover body (220) connected in sequence along the radial direction of the top cover (200), the first cover body (210) is in abutment with the anti-explosion sheet (300), the second cover body (220) protrudes away from the side of the anti-explosion sheet (300), and the second sealing protrusion (121) is in sealing abutment with the side surface of the first cover body (210).

15. The battery (1) according to claim 12, characterized in that The height of the anti-explosion sheet (300) is H2, 0.65 mm ≤ H2 ≤ 0.95 mm.

16. The battery (1) according to claim 15, characterized in that The anti-explosion sheet (300) further comprises a first body (310), a second body (320) and a third body (330) connected in sequence along the radial direction of the anti-explosion sheet (300), the first vertical plate (350) is arranged on the side of the first body (310) away from the second body (320), and along the thickness direction of the anti-explosion sheet (300), the first body (310), the second body (320) and the third body (330) are sequentially away from the top cover (200), and the first body (310) is in abutment with the top cover (200).

17. The battery (1) according to claim 16, characterized in that A distance between a plane where a side of the third body (330) facing away from the top cover (200) and a plane where a side of the second body (320) facing away from the top cover (200) is h, wherein 0.2mm≤h<0.35mm.

18. The battery (1) according to claim 16, characterized in that The explosion-proof sheet (300) further comprises a first inclined portion (340) located between the first body (310) and the second body (320), the first inclined portion (340) connecting the first body (310) and the second body (320), the top cover (200) being provided with a first pressure relief hole (230), and a projection of the first pressure relief hole (230) in a thickness direction of the explosion-proof sheet (300) being located in a plane of the first inclined portion (340) and the second body (320).

19. The battery (1) according to claim 18, characterized in that The first inclined portion (340) comprises a starting end (341) and a terminal end (342), the starting end (341) being closer to the first body (310) than the terminal end (342), and the starting end (341) being located between an inner wall of the first pressure relief hole (230) on the top cover (200) close to an edge of the top cover (200) and the edge of the top cover (200).

20. The battery (1) according to claim 19, characterized in that The terminal end (342) is located between an inner wall of the second pressure relief hole (510) on the hole plate (500) close to an edge of the hole plate (500) and the edge of the hole plate (500).

21. The battery (1) according to claim 20, characterized in that A diameter of a circle where the terminal end (342) is located is S2, wherein S2=S3+2a, wherein S3 is an outer diameter of the second pressure relief hole (510); a is a stamping edge width constant of the hole plate (500), and a value of a is in a range of 22. The battery (1) according to claim 21, characterized in that 7.7mm≤S3≤9.8mm, and 0.3mm≤a≤0.5mm.

23. The battery (1) according to claim 18, characterized in that The first inclined portion (340) comprises a starting end (341) and a terminal end (342), the starting end (341) being closer to the first body (310) than the terminal end (342), and a diameter of a circle where the starting end (341) is located is S1, 11mm≤S1≤12mm.

24. The battery (1) according to claim 23, characterized in that A diameter of a circle where the terminal end (342) is located is S2, 8.3mm≤S2≤10.8mm.

25. The battery (1) according to claim 18, characterized in that A distance between a lower surface of the first body (310) and a lower surface of the second body (320) is N1, 0.15mm≤N1≤0.3mm.

26. The battery (1) according to claim 18, characterized in that The hole plate gasket (400) is provided with a second inclined portion (410) which is connected to the first inclined portion (340) in a manner of abutting.

27. The battery (1) according to claim 26, characterized in that The hole plate (500) is provided with a third inclined portion (520) which is connected to the second inclined portion (410) in a manner of abutting.

28. A battery pack, characterized by A battery comprising any one of the battery as claimed in any one of claims 1 to 27.

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