Explosion-proof valve and battery

Abstract

The utility model relates to the technical field of batteries, and discloses an anti-explosion valve and a battery, the anti-explosion valve comprises a groove surface and a landing edge part surrounding the circumferential edge of the groove surface; at least partial area, close to the landing edge part, of the groove surface is sunken to form peripheral nicks; a reinforcing rib nick is further formed on the groove surface, the reinforcing rib nick is located on the side, away from the landing edge part, of the peripheral nick, and in the direction perpendicular to the landing edge part, at least part of the reinforcing rib nick is not overlapped with the projection of the peripheral nick; in the direction perpendicular to the landing edge part, the residual thickness of the peripheral nicks is d2, the residual thickness of the reinforcing rib nicks is d3, and d3-d2 is larger than or equal to 30 microns and smaller than or equal to 100 microns. According to the anti-explosion valve, it can be guaranteed that when thermal runaway happens to the anti-explosion valve, the anti-explosion valve is popped open from the path limited by the peripheral nicks preferentially, and therefore the exhaust area of the anti-explosion valve is guaranteed. And meanwhile, the structural strength of the groove surface can be enhanced by the reinforcing rib nicks, and the deformation of the groove surface in a normal use state is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a kind of explosion-proof valve and battery. BACKGROUND

[0002] With the continuous development of battery industry, lithium ion battery is widely used in power battery field with its high energy density advantage, and provides power for vehicle operation. The safety of the battery cell is crucial to the explosion-proof valve. When the battery cell has problems such as short circuit, overcharge and overheating, the explosion-proof valve opens in time by sensing the internal pressure change of the battery cell, and exhausts to avoid the risk of explosion or fire of the battery cell.

[0003] However, since the explosion-proof valve needs to meet the requirement of precise controllable opening, some explosion-proof valves in the prior art cannot be adapted to the battery cell process, resulting in uncontrollable opening and safety hazards. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides an explosion-proof valve and battery to solve the problem of safety hazards caused by the explosion-proof valve failing to meet the requirement of precise controllable opening.

[0005] In a first aspect, the utility model provides an explosion-proof valve, comprising:

[0006] a groove surface and a rim portion surrounding the circumferential edge of the groove surface;

[0007] At least part of the area of the groove surface close to the rim portion is recessed to form a peripheral notch;

[0008] The groove surface further forms a reinforcing rib notch, which is located on the side of the peripheral notch away from the rim portion, and at least part of the reinforcing rib notch does not overlap the projection of the peripheral notch in the direction perpendicular to the rim portion;

[0009] In the direction perpendicular to the rim portion, the residual thickness of the peripheral notch is d2, and the residual thickness of the reinforcing rib notch is d3, which satisfies 30 μm ≤ d3-d2 ≤ 100 μm.

[0010] Beneficial effects: The explosion-proof valve provided by the embodiment of the utility model forms a peripheral notch in at least part of the area of the groove surface close to the rim portion, and the groove surface further forms a reinforcing rib notch on the side of the peripheral notch away from the rim portion. By making the residual thickness d of the peripheral notch less than the residual thickness d of the reinforcing rib notch, the explosion-proof valve can be opened from the path defined by the peripheral notch when thermal runaway occurs, thereby ensuring the exhaust area of the explosion-proof valve. The reinforcing rib notch can enhance the structural strength of the groove surface and reduce the deformation amount of the groove surface in normal use.

[0011] In an alternative embodiment, the residual thickness d2 of the peripheral notch is in the range of 60 μm ≤ d2 ≤ 180 μm.

[0012] The residual thickness d3 of the reinforcing rib score is in the range of 120 μm≤d3≤180 μm.

[0013] In an alternative embodiment, the reinforcing rib score is formed by recessing the groove surface.

[0014] Beneficial effects: By recessing the groove surface to form the reinforcing rib score, the requirement for strengthening the groove surface structure is met, and the overall weight of the explosion valve is reduced, and the energy density is improved.

[0015] In an alternative embodiment, the reinforcing rib score comprises at least two arc-shaped scores, the two ends of the arc-shaped scores intersect with the peripheral score, and the at least two arc-shaped scores partially overlap to form a score overlap region.

[0016] Alternatively, the reinforcing rib score comprises at least two arc-shaped scores, the two ends of the arc-shaped scores intersect with the peripheral score, and the at least two arc-shaped scores do not overlap with each other.

[0017] Alternatively, the reinforcing rib score is configured as a Y-shaped score, and at least one end of the Y-shaped score intersects with the peripheral score.

[0018] Alternatively, the reinforcing rib score is configured as a polyline score, and at least one end of the polyline score intersects with the peripheral score.

[0019] Alternatively, the reinforcing rib score is configured as a plurality of straight line scores, and the plurality of straight line scores are not connected with the peripheral score, and the plurality of straight line scores do not intersect with each other.

[0020] Beneficial effects: By forming the reinforcing rib score at the intersection of the two reinforcing rib scores 25, the position in the middle region of the groove surface that is most prone to deformation can be strengthened, and the deformation amount is reduced.

[0021] In an alternative embodiment, the reinforcing rib score is located in the middle region of the groove surface.

[0022] In an alternative embodiment, the reinforcing rib score is centrally symmetrically arranged along the central axis in the length direction of the explosion valve, and / or the reinforcing rib score is centrally symmetrically arranged along the central axis in the width direction of the explosion valve.

[0023] In an alternative embodiment, the thickness d0 of the flange portion of the explosion valve is in the range of 0.4 mm≤d0≤0.6 mm.

[0024] In an alternative embodiment, in the direction perpendicular to the flange portion, the height difference d1 between the groove surface and the flange portion is in the range of 0.15 mm≤d1≤0.35 mm.

[0025] Beneficial effects: By limiting the lower limit of the height difference d1 between the groove surface and the overlap, the smooth opening of the explosion-proof valve can be ensured, avoiding opening difficulties caused by an excessively thick groove surface. Simultaneously, the welding requirements between the overlap and the body are met, avoiding welding difficulties caused by an excessively thin overlap. Furthermore, by limiting the upper limit of the height difference d1 between the groove surface and the overlap, material accumulation at the overlap can be avoided due to excessive differences between the two planes, preventing excessive density from affecting product performance.

[0026] Secondly, this utility model also provides a battery, comprising:

[0027] The main body has an exhaust port, and a receiving groove is formed in the area of ​​the main body corresponding to the exhaust port. The receiving groove is suitable for accommodating the explosion-proof valve as described above.

[0028] In one optional implementation, the battery dimensions satisfy the following: battery length ranges from 100mm to 600mm, battery width ranges from 50mm to 250mm, and battery height ranges from 10mm to 100mm; or, the battery dimensions satisfy the following: battery length ranges from 600mm to 1500mm, battery width ranges from 50mm to 250mm, and battery height ranges from 10mm to 100mm.

[0029] Since the battery includes an explosion-proof valve, which has the same effect as an explosion-proof valve, it will not be elaborated on here. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a top view of the battery of this utility model;

[0032] Figure 2 For the battery Figure 1 A schematic diagram under the AA section view;

[0033] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0034] Figure 4 This is a schematic diagram of the explosion-proof valve of this utility model;

[0035] Figure 5 for Figure 4 Schematic diagram of the CC section;

[0036] Figure 6 For Figure 5 Enlarged view at D;

[0037] Figure 7 For Figure 5 Enlarged view at E;

[0038] Figure 8 It is the three-dimensional schematic view of the explosion-proof valve formed in the battery cover plate of the utility model;

[0039] Figure 9 It is the schematic view of the explosion-proof valve of the battery cover plate of the utility model partially exploded;

[0040] Figure 10 It is the schematic view of another explosion-proof valve of the utility model;

[0041] Figure 11 It is the schematic view of still another explosion-proof valve of the utility model;

[0042] Figure 12 It is the schematic view of still another explosion-proof valve of the utility model;

[0043] Figure 13 It is the schematic view of still another explosion-proof valve of the utility model;

[0044] Figure 14 It is the example view of the explosion-proof valve of the utility model after being exploded along the periphery;

[0045] Figure 15 It is the example view of the explosion-proof valve of the utility model after being exploded along the periphery in part of the area and being connected through the compact part and the lapping part in another part of the area;

[0046] Figure 16 It is the schematic view of the explosion-proof valve formed in the shell of the utility model.

[0047] Explanation of reference signs:

[0048] 1, body; 11, liquid injection hole; 12, exhaust hole; 2, explosion-proof valve; 21, lapping part; 22, periphery notch; 23, groove surface; 24, notch overlapping area; 25, reinforcing rib notch; 26, compact part; 3, shell. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0050] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0053] The following is combined Figures 1 to 9 The following describes embodiments of the present invention.

[0054] According to an embodiment of the present invention, an explosion-proof valve is provided, comprising:

[0055] The grooved surface 23 and the overlapping portion 21 surrounding the circumferential edge of the grooved surface 23;

[0056] At least a portion of the grooved surface 23 near the overlapping edge 21 is recessed to form peripheral grooves 22;

[0057] The groove surface 23 is also formed with reinforcing rib marks 25. The reinforcing rib marks 25 are located on the side of the peripheral marks 22 away from the edge portion 21, and in the direction perpendicular to the edge portion 21, the reinforcing rib marks 25 do not overlap with the projection of the peripheral marks 22 at least partially.

[0058] In the direction perpendicular to the overlap 21, the remaining thickness of the peripheral notch 22 is d2, and the remaining thickness of the reinforcing rib notch 25 is d3, satisfying: 30μm≤d3-d2≤100μm.

[0059] In the embodiment, the thickness of the recessed surface 23 is smaller than the thickness of the flange portion 21, and the flange portion 21 is used for welding with the body 1 to fix the explosion-proof valve on the body 1. The flange portion 21 can meet the welding requirement by setting a larger thickness. The recessed surface 23 is set to have a smaller thickness, which can guarantee the sealing requirement in the normal use state of the battery and guarantee the smooth explosion under pressure, facilitating the exhaust.

[0060] By recessing the peripheral notch 22 in at least a part of the area of the recessed surface 23 close to the flange portion 21, the local thinning of the peripheral notch 22 can form a path guide for the opening of the recessed surface 23, and the explosion-proof valve can be opened along the path of the peripheral notch 22.

[0061] Since the thickness of the recessed surface 23 is thin and the area is large, the reinforcing rib notch 25 is further formed on the recessed surface 23, and the reinforcing rib notch 25 is located on the side of the peripheral notch 22 away from the flange portion 21, which can enhance the structural strength of the recessed surface 23 and reduce the deformation amount of the recessed surface 23 in the normal use state, thereby guaranteeing the structural strength.

[0062] In combination with Figure 14 As shown in the figure, the explosion-proof valve can be opened along the peripheral notch, and the opening path formed by the peripheral notch 22 is used as the opening path. After opening, the opening area is large enough to guarantee the exhaust area of the explosion-proof valve. Meanwhile, the minimum distance between the welding mark formed by welding the explosion-proof valve and the edge of the body 1 is greater than 4mm, which can reduce the influence of the battery process on the explosion-proof valve, thereby guaranteeing the balanced force of the explosion-proof valve, reducing the influence of external force on the explosion-proof valve, and making the opening condition of the explosion-proof valve controllable. Figure 14 As shown in the figure, after opening, the opening path formed by the original peripheral notch 22 has fewer burrs and a smoother opening.

[0063] The explosion-proof valve provided by the embodiment of the utility model, by recessing the peripheral notch 22 in at least a part of the area of the recessed surface 23 close to the flange portion 21, and the reinforcing rib notch 25 is further formed on the side of the recessed surface 23 away from the flange portion 21, by making the residual thickness d2 of the peripheral notch 22 smaller than the residual thickness d3 of the reinforcing rib notch 25, the explosion-proof valve can be opened from the path defined by the peripheral notch 22 when thermal runaway occurs, thereby guaranteeing the exhaust area of the explosion-proof valve. Meanwhile, the reinforcing rib notch 25 can enhance the structural strength of the recessed surface 23 and reduce the deformation amount of the recessed surface 23 in the normal use state.

[0064] Further, by limiting the upper and lower limits of the difference between the residual thickness d3 of the reinforcing rib score 25 and the residual thickness d2 of the peripheral score 22, the opening condition of the explosion-proof valve can be precisely controlled, which is suitable for the battery cell process and meets the opening requirements of specific working conditions, improves safety, avoids the premature opening of the explosion-proof valve when the pressure is small, and also avoids the excessive injection pressure caused by the lagging opening of the explosion-proof valve when the pressure is too large.

[0065] Optionally, the peripheral score 22 is arranged around the groove surface 23 near the flange part 21, which can ensure that the explosion-proof valve has enough exhaust area when it opens along the peripheral score 22.

[0066] If the residual thickness d2 of the peripheral score 22 is greater than the residual thickness d3 of the reinforcing rib score 25, it is easy to cause the position of the reinforcing rib score 25 to be a weak force point, so that the explosion-proof valve is opened along the path of the reinforcing rib score 25, resulting in a smaller opening area, and the reinforcing rib score 25 cannot effectively play a reinforcing role.

[0067] In some embodiments, as shown in Figure 6 , Figure 7 the value range of the residual thickness d2 of the peripheral score 22 is 60 μm≤d2≤180 μm;

[0068] the value range of the residual thickness d3 of the reinforcing rib score 25 is 120 μm≤d3≤180 μm.

[0069] Optionally, the value of the residual thickness d2 of the peripheral score 22 can be 90 μm or 100 μm or 120 μm or 140 μm or 160 μm, etc.

[0070] Optionally, the value of the residual thickness d3 of the reinforcing rib score 25 can be 120 μm or 140 μm or 160 μm or 170 μm or 180 μm, etc.

[0071] In some embodiments, the reinforcing rib score 25 is formed by recessing the groove surface 23.

[0072] By making the reinforcing rib score 25 formed by recessing the groove surface 23, the requirement for strengthening the structure of the groove surface 23 can be met, and the overall weight of the explosion-proof valve can be reduced, and the energy density can be improved.

[0073] As a variation, the reinforcing rib score 25 can also be formed by partially protruding the groove surface 23.

[0074] In some embodiments, as shown in Figure 4 the reinforcing rib score 25 includes at least two arc-shaped scores, the two ends of the arc-shaped scores intersect with the peripheral score 22, and the at least two arc-shaped scores partially overlap to form a score overlap area 24.

[0075] In the embodiment, the two ends of the reinforcing rib score 25 are taken as the starting points of the joint positions of the linear segments and the arc segments of the runway type structure. Two reinforcing rib scores 25 are formed on the groove surface 23, and the two reinforcing rib scores 25 are symmetrically arranged with respect to the central axis of the length direction of the explosion-proof valve.

[0076] By forming the score overlap area 24 at the joint of the two reinforcing rib scores 25, the position of the middle region of the groove surface 23 which is most prone to deformation can be reinforced, and the deformation amount is reduced.

[0077] In some other embodiments, in combination with Figure 10 As shown in the figure, the reinforcing rib score 25 includes two arc-shaped scores, the two ends of the arc-shaped scores intersect with the peripheral score 22, and the two arc-shaped scores have no overlapping area.

[0078] In some other embodiments, in combination with Figure 11 As shown in the figure, the reinforcing rib score 25 is configured as a Y-shaped score, at least one end of the Y-shaped score intersects with the peripheral score 22; in combination with Figure 12 As shown in the figure, the reinforcing rib score 25 is configured as a polyline score, at least one end of the polyline score intersects with the peripheral score 22.

[0079] In some other embodiments, in combination with Figure 13 As shown in the figure, the reinforcing rib score 25 is configured as a plurality of linear scores, and the plurality of linear scores are not connected with the peripheral score 22, and do not intersect with each other.

[0080] As a deformation, the reinforcing rib score 25 can also be configured in other structural forms.

[0081] In some embodiments, the reinforcing rib score 25 is located in the middle region of the groove surface 23.

[0082] Further, the reinforcing rib score 25 is symmetrically arranged with respect to the central axis of the length direction of the explosion-proof valve, and / or the reinforcing rib score 25 is symmetrically arranged with respect to the central axis of the width direction of the explosion-proof valve.

[0083] In some embodiments, the thickness d0 of the flange part 21 of the explosion-proof valve is in the range of 0.4mm≤d0≤0.6mm.

[0084] In some embodiments, the thickness d4 of the compact part 26 is d4=d0-d1, wherein d0 is the thickness of the flange part 21, and d1 is the height difference between the groove surface 23 and the flange part 21 in the direction perpendicular to the flange part 21.

[0085] Optionally, the thickness d4 of the compact part 26 is in the range of 0.25mm≤d4≤0.35mm.

[0086] In some embodiments, in combination with Figure 6As shown, the height difference between the groove surface 23 and the flange portion 21 in the direction perpendicular to the flange portion 21 is d1, and satisfies 0.15mm≤d1≤0.35mm.

[0087] By limiting the lower limit of the height difference d1 between the groove surface 23 and the flange portion 21, the smooth opening of the explosion-proof valve can be ensured, and the difficulty of opening caused by the excessive thickness of the groove surface 23 can be avoided, and at the same time, the welding requirement of the flange portion 21 and the body 1 can be met, and the difficulty of welding caused by the excessive thinness of the flange portion 21 can be avoided. At the same time, by limiting the upper limit of the height difference d1 between the groove surface 23 and the flange portion 21, the material accumulation of the flange portion 21 caused by the excessive difference between the two planes can be avoided, and the influence of the excessive density on the product performance can be avoided.

[0088] Optionally, the height difference d1 between the groove surface 23 and the flange portion 21 can be 0.15mm or 0.16mm or 0.17mm or 0.18mm or 0.19mm, etc.

[0089] In some embodiments, in combination Figure 4 As shown, the peripheral notch 22 is continuously and non-closed loop arranged on the outer periphery of the groove surface 23, and the groove surface 23 forms a compact portion 26 in the region adjacent to the flange portion 21 and not provided with the peripheral notch 22.

[0090] Optionally, the flange portion 21 of the explosion-proof valve is configured as a racetrack structure, wherein the racetrack structure includes straight line segments arranged in parallel on both sides of the explosion-proof valve in the width direction, and circular arc segments arranged at both ends of the straight line segments in the length direction.

[0091] The groove surface 23 is continuously arranged in the interior of the flange portion 21.

[0092] In the present embodiment, the compact portion 26 corresponds to one of the straight line segments of the racetrack structure, and the length of the compact portion 26 is Z, and Z satisfies: Z=Y-(4mm~6mm), wherein Y is the distance between the centers of the two semicircles of the circular arc segments at both ends of the straight line segment in the length direction.

[0093] The explosion-proof valve provided by the embodiment of the utility model, by making the peripheral notch 22 continuously and non-closed loop arranged on the outer periphery of the groove surface 23, and the groove surface 23 forms a compact portion 26 in the region adjacent to the flange portion 21 and not provided with the peripheral notch 22, so that when the explosion-proof valve is subjected to pressure, it can be opened along the path formed by the peripheral notch 22, and the groove surface 23 after opening is kept connected with the flange portion 21 through the compact portion 26, which can ensure the opening area of the explosion-proof valve, avoid the groove surface 23 after opening flying out, prevent the groove surface 23 after opening from damaging other external structures when moving in height, and avoid the groove surface 23 after flying out blocking the explosion-proof valves of other batteries, and prevent short circuit caused by accidental lapping.

[0094] In combinationFigure 15 As shown, when the groove surface 23 forms the compacted part 26 in the region adjacent to the lap joint part 21 and not provided with the peripheral notch 22, the explosion valve can be exploded along the path of the peripheral notch 22, and the exploded groove surface 23 is kept connected with the lap joint part 21 through the compacted part 26, which can avoid the exploded groove surface 23 flying out while ensuring the opening area of the explosion valve. Figure 15 As can be seen, even if the reinforcing rib notch 25 is formed on the groove surface 23, since the residual thickness d3 of the reinforcing rib notch 25 is greater than the residual thickness d2 of the peripheral notch 22, when thermal runaway occurs, the explosion valve will still preferentially explode from the path defined by the peripheral notch 22, and will not explode from the path of the reinforcing rib notch 25, so that the reinforcing rib notch 25 only plays a structural strengthening role to ensure that the opening area is large enough. The original peripheral notch 22 forms an opening path with less burrs and a smoother opening.

[0095] According to the embodiments of the utility model, on the other hand, a battery is also provided, which comprises:

[0096] The body 1 is provided with an exhaust hole 12, and the region of the body 1 corresponding to the exhaust hole 12 is further formed with a containing groove suitable for containing the explosion valve as described above.

[0097] The explosion valve is arranged in the containing groove and is welded with the body 1 through the lap joint part 21 to realize sealed connection.

[0098] In some embodiments, in combination with Figure 1 As shown, in the plane parallel to the body 1, the minimum distance f between the welding mark formed by welding the explosion valve with the containing groove and the edge of the body 1 is greater than 4mm.

[0099] By making the minimum distance f between the welding mark formed by welding the explosion valve with the containing groove and the edge of the body 1 greater than 4mm, the influence of the cell process on the explosion valve can be reduced, such as the operation of shell cover peripheral welding, so as to ensure the balanced stress of the explosion valve, reduce the influence of external force on the explosion valve, and make the opening condition of the explosion valve controllable.

[0100] In the embodiment, the body 1 can comprise a battery cover plate and further comprise a shell 3.

[0101] In some embodiments, in combination with Figure 3 As shown, in the plane perpendicular to the body 1, the depth of the containing groove is a1, and the thickness of the lap joint part 21 of the explosion valve is d0; the explosion valve is contained in the containing groove, and satisfies: 0mm≤a1-d0≤0.2mm.

[0102] Wherein, the value range of a1 is 0.5mm≤a1≤0.6mm.

[0103] By making the depth a1 of the accommodating groove greater than the thickness d0 of the flange portion 21 of the explosion-proof valve, the accommodating groove can completely accommodate the explosion-proof valve, and the explosion-proof valve and the aluminum plate can be smoothly assembled and welded. If the height difference is less than 0 mm, the explosion-proof valve is likely to protrude from the body 1, which is likely to cause wear of the explosion-proof valve. If the height difference is greater than 0.1 mm, the explosion-proof valve and the body 1 are likely to be poorly welded.

[0104] In this embodiment, the thickness d0 of the flange portion 21 of the explosion-proof valve can be in the range of 0.4 mm≤d0≤0.6 mm.

[0105] In the direction parallel to the groove face 23, the width L1 of the flange portion 21 can be in the range of 2 mm≤L1≤3 mm. If the width is less than 2 mm, it is not conducive to stamping of the explosion-proof valve and subsequent welding with the aluminum plate. If the width is greater than 3 mm, it will cause area waste, and the effective opening area of the explosion-proof valve will be lost in the limited area of the explosion-proof valve.

[0106] The effective opening area of the explosion-proof valve is the area defined by the inner region of the peripheral notch 22.

[0107] In some embodiments, in combination with Figure 3 As shown in FIG. 1, in the direction perpendicular to the plane on which the body 1 lies, the peripheral notch 22 is located in the projection range of the exhaust hole 12; and in the direction parallel to the groove face 23, the minimum distance c between the peripheral notch 22 and the exhaust hole 12 at the edge of the body 1 satisfies: 1 mm≤c≤2 mm.

[0108] Since the peripheral notch 22 is located in the projection range of the exhaust hole 12, when the explosion-proof valve is opened along the peripheral notch 22, the exhaust hole 12 can avoid interfering with the opening area of the groove face 23.

[0109] At the same time, by limiting the lower limit of the minimum distance c between the peripheral notch 22 and the exhaust hole 12 at the edge of the body 1 in the direction parallel to the groove face 23, the exhaust hole 12 can avoid interfering with the opening area of the groove face 23, and by limiting the upper limit of the minimum distance c between the peripheral notch 22 and the exhaust hole 12 at the edge of the body 1 in the direction parallel to the groove face 23, the explosion-proof valve can have sufficient opening area, and the exhaust hole 12 can avoid being too large.

[0110] In some other embodiments, in combination with Figure 16 As shown in FIG. 2, the shell 3 of the battery is provided with an exhaust hole 12, and the region of the shell 3 corresponding to the exhaust hole 12 is formed with an accommodating groove, and the explosion-proof valve 2 is fixedly connected with the shell 3. It should be noted that the exhaust hole 12 can be provided on the shell 3 of the battery or on the battery cover plate, and correspondingly, the explosion-proof valve 2 can be provided on the shell 3 of the battery or on the battery cover plate, as long as the exhaust pressure relief requirement is met.

[0111] In combination with Table 1 below, the opening effect of the explosion-proof valve provided by the embodiments of the present application is verified through several groups of test examples as follows.

[0112] Embodiment 1: The length size of the explosion-proof valve is 31.7 mm, the width size is 19.7 mm, the thickness d0 of the flange part 21 of the explosion-proof valve is 0.5 mm, the thickness d4 of the compacting part 26 is 0.3 mm, the residual thickness d2 of the peripheral notch 22 is 0.12 mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.20 mm, and the length Z of the compacting part 26 is 6 mm. The explosion test is performed on the cover plate, the measured blasting pressure is 0.605 Mpa, and the explosion-proof valve is successfully blown open along the peripheral notch 22.

[0113] Embodiment 2: The length size of the explosion-proof valve is 45 mm, the width size is 27 mm, the thickness d0 of the flange part 21 of the explosion-proof valve is 0.55 mm, the thickness d4 of the compacting part 26 is 0.35 mm, the residual thickness d2 of the peripheral notch 22 is 0.16 mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.25 mm, and the length Z of the compacting part 26 is 6 mm. The explosion test is performed on the cover plate, the measured blasting pressure is 0.895 Mpa, and the explosion-proof valve is successfully blown open along the peripheral notch 22.

[0114] Embodiment 3: The length size of the explosion-proof valve is 31.7 mm, the width size is 19.7 mm, the thickness d0 of the flange part 21 of the explosion-proof valve is 0.5 mm, the thickness d4 of the compacting part 26 is 0.3 mm, the residual thickness d2 of the peripheral notch 22 is 0.12 mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.20 mm, and the length Z of the compacting part 26 is 6 mm. The breathing test is performed, the internal and external pressure difference is set to 0.1 Mpa, and the test is performed for 50,000 times. Subsequently, the explosion test is performed on the cover plate, the explosion-proof valve is successfully blown open along the peripheral notch 22, and the measured blasting pressure is 0.590 Mpa (the design value of the blasting pressure is 0.6±0.2 Mpa). It can be seen that the blasting pressure meets the design requirements.

[0115] Embodiment 4: The length size of the explosion-proof valve is 31.7 mm, the width size is 19.7 mm, the thickness d0 of the flange part 21 of the explosion-proof valve is 0.5 mm, the thickness d4 of the compacting part 26 is 0.3 mm, the residual thickness d2 of the peripheral notch 22 is 0.15 mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.20 mm, and the length Z of the compacting part 26 is 6 mm. The explosion test is performed on the cover plate, the measured blasting pressure is 0.585 Mpa, and the explosion-proof valve is successfully blown open along the peripheral notch 22.

[0116] Comparative Example 1: The length dimension of the explosion-proof valve is 31.7 mm, the width dimension is 19.7 mm, the thickness d0 of the flange portion 21 of the explosion-proof valve is 0.5 mm, the thickness d4 of the compacting portion 26 is 0.3 mm, the residual thickness d2 of the peripheral score 22 is 0.12 mm, the residual thickness d3 of the reinforcing rib score 25 is 0.13 mm, and the length Z of the compacting portion 26 is 6 mm. The cover plate is tested by blasting, and the blasting pressure is measured to be 0.635 MPa. The explosion-proof valve does not explode along the peripheral score 22, but explodes along the reinforcing rib score 25, so that the air leakage area after opening is small.

[0117] Comparative Example 2: The length dimension of the explosion-proof valve is 31.7 mm, the width dimension is 19.7 mm, the thickness d0 of the flange portion 21 of the explosion-proof valve is 0.5 mm, the thickness d4 of the compacting portion 26 is 0.3 mm, the residual thickness d2 of the peripheral score 22 is 0.12 mm, the residual thickness d3 of the reinforcing rib score 25 is 0.14 mm, and the length Z of the compacting portion 26 is 6 mm. The cover plate is tested by blasting, and the blasting pressure is measured to be 0.645 MPa. The explosion-proof valve does not explode along the peripheral score 22, but explodes along the reinforcing rib score 25, so that the air leakage area after opening is small (as shown in Figure 9

[0118] Comparative Example 3: The length dimension of the explosion-proof valve is 31.7 mm, the width dimension is 19.7 mm, the thickness d0 of the flange portion 21 of the explosion-proof valve is 0.5 mm, the thickness d4 of the compacting portion 26 is 0.3 mm, the residual thickness d2 of the peripheral score 22 is 0.08 mm, the residual thickness d3 of the reinforcing rib score 25 is 0.20 mm, and the length Z of the compacting portion 26 is 6 mm. The breathing test is performed with an internal and external pressure difference of 0.1 MPa, and the test is repeated 50,000 times. Subsequently, the cover plate is tested by blasting, and the blasting pressure is measured to be 0.349 MPa (the design value of the blasting pressure is 0.6±0.2 MPa). It can be seen that the blasting pressure does not meet the design requirements.

[0119] Table 1

[0120]

[0121] It can be seen that the reinforcing rib provided in the middle position of the explosion-proof valve can enhance the fatigue resistance of the explosion-proof valve.

[0122] ​The material system of the battery cell includes various systems, such as lithium iron phosphate (LFP), ternary lithium (NCM), lithium iron manganese phosphate, cobalt-free system, and sodium battery. Different systems of battery cells correspond to different explosion valve burst pressures. For example, the explosion valve burst pressure of LFP can be selected in the range of 0.4 Mpa-0.8 Mpa; the explosion valve burst pressure of NCM can be selected in the range of 0.7 Mpa-1.2 Mpa; the explosion valve burst pressure of the cobalt-free system can be selected in the range of 0.8 Mpa-1.2 Mpa; the explosion valve burst pressure of the sodium battery can be selected in the range of 0.7 Mpa-1.1 Mpa. In addition, the explosion valve burst pressure of the semi-solid battery / full solid battery can be selected in the range of 0.7 Mpa-1.2 Mpa; the present patent defines and protects the parameters from the size of the explosion valve, but is not limited to the system.

[0123] In some embodiments, the size of the battery satisfies: the length of the battery is in the range of 100 mm-600 mm, the width of the battery is in the range of 50 mm-250 mm, and the height of the battery is in the range of 10 mm-100 mm; or, the size of the battery satisfies: the length of the battery is in the range of 600 mm-1500 mm, the width of the battery is in the range of 50 mm-250 mm, and the height of the battery is in the range of 10 mm-100 mm.

[0124] Optionally, in combination with Figure 3 As shown, the thickness a0 of the shell is in the range of 1.0 mm≤a0≤1.5 mm. In order to meet the welding and shell strength, the depth a1 of the corresponding accommodating groove is in the range of 0.5 mm≤a1≤0.6 mm.

[0125] The side of the explosion valve with the peripheral notch 22 can be installed towards the inside of the shell, or the side of the explosion valve with the peripheral notch 22 can be installed towards the outside of the shell. When the side of the explosion valve with the peripheral notch 22 is installed towards the inside of the shell, external contact can effectively prevent damage to the notch of the explosion valve, but there is a risk that the electrolyte will corrode the explosion valve, resulting in a decrease in the detonation pressure (it is worth noting that the electrolyte will produce hydrofluoric acid HF in a water environment, and HF will corrode the residual thickness). When the side of the explosion valve with the peripheral notch 22 is installed towards the outside of the shell, the electrolyte in the battery cell can avoid corroding the notch of the explosion valve, but there is a risk that the notch surface of the explosion valve will be interfered, and a protection piece for the explosion valve needs to be added, which causes a bottom flatness problem, resulting in unevenness of the bottom of the battery cell.

[0126] Obviously, the above embodiments are only examples for clear illustration, and are not a limitation on the embodiments. Although the embodiments of the present application are described in combination with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the present application.

Claims

1. An explosion relief valve, characterized in that The groove surface and the rim portion surrounding the circumferential edge of the groove surface are provided; At least part of the area of the groove surface close to the rim portion is recessed to form a peripheral notch; The groove surface is further provided with a reinforcing rib notch, which is located on the side of the peripheral notch away from the rim portion, and in the direction perpendicular to the rim portion, the reinforcing rib notch at least partially does not overlap with the projection of the peripheral notch; In the direction perpendicular to the rim portion, the residual thickness of the peripheral notch is d2, and the residual thickness of the reinforcing rib notch is d3, which satisfies: 30μm≤d3-d2≤100μm; The reinforcing rib notch includes at least two arc-shaped notches, the two ends of the arc-shaped notches intersect with the peripheral notch, and at least two arc-shaped notches partially overlap to form a notch overlap area. The value range of the residual thickness d2 of the peripheral notch is: 60μm≤d2≤180μm; 2. The explosion relief valve of claim 1, wherein And / or, the value range of the residual thickness d3 of the reinforcing rib notch is: 120μm≤d3≤180μm. The reinforcing rib notch is recessed from the groove surface.

3. The explosion relief valve of claim 1, wherein, The reinforcing rib notch is located in the middle area of the groove surface.

4. The explosion relief valve of claim 1, wherein, The reinforcing rib notch is centrally symmetrically arranged along the central axis in the length direction of the explosion-proof valve, and / or the reinforcing rib notch is centrally symmetrically arranged along the central axis in the width direction of the explosion-proof valve.

5. The explosion relief valve of claim 4, wherein, The thickness d0 of the rim portion of the explosion-proof valve satisfies: 0.4mm≤d0≤0.6mm.

6. Explosion relief valve according to any of claims 1 to 5, characterized in that In the direction perpendicular to the rim portion, the height difference d1 between the groove surface and the rim portion satisfies: 0.15mm≤d1≤0.35mm.

7. Explosion relief valve according to any of claims 1 to 5, characterized in that The body is provided with an exhaust hole, and the area of the body corresponding to the exhaust hole is further provided with a containing groove, which is suitable for containing the explosion-proof valve according to any one of claims 1 to 7.

8. A battery, characterized by The size of the battery satisfies: the length of the battery is in the range of 100mm-600mm, the width of the battery is in the range of 50mm-250mm, and the height of the battery is in the range of 10mm-100mm; or the size of the battery satisfies: the length of the battery is in the range of 600mm-1500mm, the width of the battery is in the range of 50mm-250mm, and the height of the battery is in the range of 10mm-100mm. ​ 9. The battery of claim 8, wherein, ​

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