CN117748049A - Explosion-proof valve and battery - Google Patents
Explosion-proof valve and battery Download PDFInfo
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- CN117748049A CN117748049A CN202410167182.5A CN202410167182A CN117748049A CN 117748049 A CN117748049 A CN 117748049A CN 202410167182 A CN202410167182 A CN 202410167182A CN 117748049 A CN117748049 A CN 117748049A
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- Prior art keywords
- explosion
- notch
- proof valve
- score
- peripheral
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 80
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 46
- 238000004880 explosion Methods 0.000 claims description 46
- 239000011324 bead Substances 0.000 claims description 7
- 239000003351 stiffener Substances 0.000 claims description 7
- 238000003466 welding Methods 0.000 description 15
- 230000006835 compression Effects 0.000 description 12
- 238000007906 compression Methods 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 238000003825 pressing Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- -1 cobalt-free systems Chemical compound 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention relates to the technical field of batteries, and discloses an explosion-proof valve and a battery, wherein the explosion-proof valve comprises: the groove surface and the lapping part surrounding the circumferential edge of the groove surface; at least part of the groove surface near the lapping part is concavely provided with a peripheral notch; the groove surface is also provided with a reinforcing rib notch, the reinforcing rib notch is positioned on one side of the peripheral notch away from the lap edge part, and at least part of the reinforcing rib notch is not overlapped with the projection of the peripheral notch in the direction perpendicular to the lap edge part; in the direction perpendicular to the overlap portion, the residual thickness of the peripheral scores is d2, the residual thickness of the reinforcing rib scores is d3, and the following conditions are satisfied: d3-d2 is less than or equal to 30 mu m and less than or equal to 100 mu m. The explosion-proof valve provided by the invention can ensure that the explosion-proof valve is preferentially exploded from a path defined by the peripheral nicks when thermal runaway occurs, thereby ensuring the exhaust area of the explosion-proof valve. Meanwhile, the structural strength of the groove surface can be enhanced by the notch of the reinforcing rib, and the deformation of the groove surface in a normal use state is reduced.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an explosion-proof valve and a battery.
Background
Along with the continuous development of the battery industry, the lithium ion battery is widely used in the field of power batteries to provide power for vehicle operation due to the advantage of high energy density. The explosion-proof valve plays a vital role in the safety of the battery cell, and when the battery cell has the problems of short circuit, overcharge, overheat and the like, the explosion-proof valve is timely opened by sensing the change of the air pressure in the battery cell to perform air discharge and pressure relief, so that the risks of explosion or fire and the like of the battery cell are avoided.
However, because the explosion-proof valve needs to meet the requirement of accurate and controllable opening, part of the explosion-proof valves in the prior art cannot adapt to the process of the electrical core, so that the opening is uncontrollable, and potential safety hazards exist.
Disclosure of Invention
In view of the above, the invention provides an explosion-proof valve and a battery, which are used for solving the problem that the explosion-proof valve cannot meet the requirement of accurate and controllable opening, so that potential safety hazards exist.
In a first aspect, the present invention provides an explosion-proof valve comprising:
the groove surface and the lapping part surrounding the circumferential edge of the groove surface;
at least part of the groove surface near the lapping part is concavely provided with a peripheral notch;
the groove surface is also provided with a reinforcing rib notch, the reinforcing rib notch is positioned on one side of the peripheral notch away from the lap edge part, and at least part of the reinforcing rib notch is not overlapped with the projection of the peripheral notch in the direction perpendicular to the lap edge part;
in the direction perpendicular to the overlap portion, the residual thickness of the peripheral scores is d2, the residual thickness of the reinforcing rib scores is d3, and the following conditions are satisfied: d3-d2 is less than or equal to 30 mu m and less than or equal to 100 mu m.
The beneficial effects are that: according to the explosion-proof valve provided by the embodiment of the invention, the peripheral notch is concavely formed in at least part of the groove surface close to the overlap edge part, and the reinforcing rib notch is further formed on one side of the groove surface, far away from the overlap edge part, of the peripheral notch, and the residual thickness d of the peripheral notch is smaller than the residual thickness d of the reinforcing rib notch, so that the explosion-proof valve can be ensured to be exploded preferentially from a path defined by the peripheral notch when thermal runaway occurs, and the exhaust area of the explosion-proof valve is ensured. Meanwhile, the structural strength of the groove surface can be enhanced by the notch of the reinforcing rib, and the deformation of the groove surface in a normal use state is reduced.
In an alternative embodiment, the residual thickness d2 of the peripheral score has a range of values: d2 is more than or equal to 60 mu m and less than or equal to 180 mu m;
the residual thickness d3 of the reinforcing rib notch has the following range: d3 is not less than 120 mu m and not more than 180 mu m.
In an alternative embodiment, the rib score is recessed from the groove face.
The beneficial effects are that: through making the strengthening rib nick form by the recess face is sunken, can satisfy the demand to recess face structure reinforcing, can reduce explosion-proof valve whole weight again, improve energy density.
In an alternative embodiment, the rib score comprises at least two arcuate scores, the ends of the arcuate scores intersect the perimeter score, and at least two arcuate score portions overlap to form a score overlap region;
or, the reinforcing rib notch comprises at least two arc-shaped notches, two ends of each arc-shaped notch are intersected with the peripheral notch, and the at least two arc-shaped notches are not overlapped with each other;
or the reinforcing rib notch is constructed as a Y-shaped notch, and at least one end of the Y-shaped notch is intersected with the peripheral notch;
or, the reinforcing rib notch is constructed as a broken line type notch, and at least one end head of the broken line type notch is intersected with the peripheral notch;
alternatively, the rib score is configured as a plurality of linear scores, and the plurality of linear scores are not connected to the peripheral score, and the plurality of linear scores are not intersected with each other.
The beneficial effects are that: by forming the rib scores at the junction of the two rib scores 25, the position where deformation is most likely to occur in the intermediate region of the groove surface can be reinforced, and the deformation amount can be reduced.
In an alternative embodiment, the rib score is located in a central region of the groove face.
In an alternative embodiment, the rib scores are arranged symmetrically along the center axis of the explosion-proof valve in the length direction and/or the rib scores are arranged symmetrically along the center axis of the explosion-proof valve in the width direction.
In an alternative embodiment, the thickness d0 of the overlap of the explosion protection valve has a value in the range 0.4mm < d0 < 0.6mm.
In an alternative embodiment, the height difference d1 between the groove surface and the overlap is in the range 0.15 mm.ltoreq.d1.ltoreq.0.35 mm in the direction perpendicular to the overlap.
The beneficial effects are that: through the lower limit of the difference in height d1 between the limiting groove surface and the overlap edge portion, the explosion-proof valve can be opened smoothly, the difficulty in opening caused by the fact that the groove surface is too thick is avoided, meanwhile, the welding requirements of the overlap edge portion and the body are met, and the welding difficulty caused by the fact that the overlap edge portion is too thin is avoided. Meanwhile, by limiting the upper limit of the height difference d1 between the groove surface and the lapping edge, the lapping edge material accumulation caused by overlarge difference between two planes can be avoided, and the influence of overlarge density on the product performance is avoided.
In a second aspect, the present invention also provides a battery comprising:
the body is provided with an exhaust hole, and the area of the body corresponding to the exhaust hole is also provided with a containing groove which is suitable for containing the explosion-proof valve.
In an alternative embodiment, the battery is sized to: the battery length is 100mm-600mm, the battery width is 50mm-250mm, and the battery height is 10mm-100mm; alternatively, the battery size satisfies: the battery length is 600mm-1500mm, the battery width is 50mm-250mm, and the battery height is 10mm-100mm.
Since the battery includes the explosion-proof valve, it has the same effect as the explosion-proof valve, and a detailed description thereof will be omitted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a top view of a battery of the present invention;
FIG. 2 is a schematic view of the battery in section view A-A of FIG. 1;
FIG. 3 is an enlarged view at B in FIG. 2;
FIG. 4 is a schematic view of an explosion proof valve of the present invention;
FIG. 5 is a schematic view of section C-C of FIG. 4;
FIG. 6 is an enlarged view of FIG. 5 at D;
FIG. 7 is an enlarged view at E in FIG. 5;
fig. 8 is a perspective view showing an explosion-proof valve of the present invention formed at a battery cover plate;
FIG. 9 is a schematic illustration of a partial explosion of an explosion proof valve of a battery cover plate of the present invention;
FIG. 10 is a schematic view of another explosion protection valve of the present invention;
FIG. 11 is a schematic view of yet another explosion protection valve of the present invention;
FIG. 12 is a schematic view of yet another explosion protection valve of the present invention;
FIG. 13 is a schematic view of an additional explosion-proof valve of the present invention;
FIG. 14 is an exemplary view of the explosion valve of the present invention after explosion along a perimeter score;
FIG. 15 is a diagram showing an example of the explosion valve section of the present invention bursting apart another section along a perimeter score connected to a lap portion by a compressive member;
fig. 16 is a schematic view of the explosion proof valve of the present invention formed in a housing.
Reference numerals illustrate:
1. a body; 11. a liquid injection hole; 12. an exhaust hole; 2. an explosion-proof valve; 21. a lapping part; 22. a peripheral score; 23. a groove surface; 24. scoring the overlap region; 25. scoring the reinforcing rib; 26. a compression part; 3. a housing.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
An embodiment of the present invention is described below with reference to fig. 1 to 9.
According to an embodiment of the present invention, in one aspect, there is provided an explosion-proof valve including:
a groove surface 23 and a lap portion 21 surrounding the circumferential edge of the groove surface 23;
at least a partial region of the groove surface 23 adjacent to the lap edge portion 21 is concavely formed with a peripheral score 22;
the groove surface 23 is also formed with a rib score 25, the rib score 25 is positioned on one side of the peripheral score 22 away from the overlap portion 21, and at least part of the rib score 25 is projected to be non-overlapping with the peripheral score 22 in the direction perpendicular to the overlap portion 21;
in the direction perpendicular to the lap portion 21, the residual thickness of the peripheral score 22 is d2, and the residual thickness of the bead score 25 is d3, satisfying: d3-d2 is less than or equal to 30 mu m and less than or equal to 100 mu m.
In this embodiment, the thickness of the groove surface 23 is smaller than the thickness of the overlap portion 21, and the overlap portion 21 is used for welding with the body 1 to fix the explosion-proof valve to the body 1. The overlap portion 21 can meet the welding demand by providing a large thickness. The groove surface 23 can ensure the sealing requirement of the normal use state of the battery on one hand and the smooth blasting when being under pressure on the other hand by setting a smaller thickness, so that the exhaust is convenient.
By forming the peripheral score 22 in the recess surface 23 near at least a partial region of the overlap portion 21, the partial thinning of the peripheral score 22 can form a path guide for opening the recess surface 23, and the explosion-proof valve can be opened along the path of the peripheral score 22.
Because the thickness of the groove surface 23 is thinner and the area is larger, the reinforcing rib scores 25 are further formed on the groove surface 23, and the reinforcing rib scores 25 are positioned on the side, away from the overlap edge portion 21, of the peripheral scores 22, so that the structural strength of the groove surface 23 can be enhanced, the deformation of the groove surface 23 in a normal use state can be reduced, and the structural strength can be ensured.
As shown in fig. 14, it can be seen that the explosion-proof valve can be exploded along the peripheral scores, and the guide path formed by the peripheral scores 22 is used as an opening path, so that after opening, the opening area can be ensured to be large enough, and the exhaust area of the explosion-proof valve can be ensured. Meanwhile, the minimum distance between the explosion-proof valve and the edge of the body 1 formed by welding the containing groove is larger than 4mm, so that the influence of the battery cell manufacturing process on the explosion-proof valve can be reduced, the stress balance of the explosion-proof valve is ensured, the influence of external force on the explosion-proof valve is reduced, and the opening condition of the explosion-proof valve is accurate and controllable. As can be seen in conjunction with fig. 14, after opening, the original perimeter score 22 forms an opening path with less burrs and a smoother opening.
According to the explosion-proof valve provided by the embodiment of the invention, the peripheral notch 22 is concavely formed in the groove surface 23 at least in the partial area close to the overlap edge part 21, and the reinforcing rib notch 25 is further formed on the side, far away from the overlap edge part 21, of the groove surface 23, and the residual thickness d2 of the peripheral notch 22 is smaller than the residual thickness d3 of the reinforcing rib notch 25, so that the explosion-proof valve can be ensured to preferentially burst out of a path defined by the peripheral notch 22 when thermal runaway occurs, and the exhaust area of the explosion-proof valve is ensured. Meanwhile, the reinforcing rib scores 25 can enhance the structural strength of the groove surface 23 and reduce the deformation of the groove surface 23 in a normal use state.
Further, by limiting the upper and lower limits of the difference between the residual thickness d3 of the reinforcing rib notch 25 and the residual thickness d2 of the peripheral notch 22, the opening condition of the explosion-proof valve can be precisely controlled, the electric core manufacturing process is adapted, the opening requirement of specific working conditions is met, the safety is improved, the explosion-proof valve is prevented from being opened in advance when the pressure is smaller, and meanwhile, the excessive injection pressure caused by the opening lag of the explosion-proof valve when the pressure is too large is avoided.
Optionally, the peripheral score 22 surrounds the groove surface 23 near the overlap portion 21, so that a sufficient vent area for opening the explosion-proof valve can be ensured when the explosion-proof valve is opened along the peripheral score 22.
If the residual thickness d2 of the peripheral score 22 is greater than the residual thickness d3 of the stiffener score 25, the position of the stiffener score 25 is easily a weak point, so that the explosion-proof valve turns over along the path of the stiffener score 25, resulting in a smaller opening area, and the stiffener score 25 cannot effectively play a role in reinforcement.
In some embodiments, as shown in fig. 6 and 7, the residual thickness d2 of the peripheral score 22 is in the range: d2 is more than or equal to 60 mu m and less than or equal to 180 mu m;
the residual thickness d3 of the rib score 25 has a range of values: d3 is not less than 120 mu m and not more than 180 mu m.
Alternatively, the residual thickness d2 of the peripheral score 22 may take the value of 90 μm or 100 μm or 120 μm or 140 μm or 160 μm or the like.
Alternatively, the residual thickness d3 of the rib score 25 may take the value of 120 μm or 140 μm or 160 μm or 170 μm or 180 μm or the like.
In some embodiments, the bead score 25 is recessed from the groove face 23.
The reinforcing rib scores 25 are formed by recessing the groove surface 23, so that the requirement on structural reinforcement of the groove surface 23 can be met, the integral weight of the explosion-proof valve can be reduced, and the energy density can be improved.
As a variant, the rib scores 25 may also be formed by partial projections of the groove surfaces 23.
In some embodiments, as shown in connection with fig. 4, the rib score 25 comprises at least two arcuate scores, the ends of which intersect the perimeter score 22, and at least two arcuate score portions overlap to form a score overlap region 24.
In this embodiment, the two ends of the stiffener score 25 start from the intersection of the straight line segment and the circular arc segment of the racetrack structure. Two reinforcing rib scores 25 are formed on the groove surface 23, and the two reinforcing rib scores 25 are symmetrically arranged relative to the central axis of the explosion-proof valve along the length direction.
By forming the score overlapping region 24 at the junction of the two bead scores 25, the position where deformation is most likely to occur in the intermediate region of the groove surface 23 can be reinforced, and the deformation amount can be reduced.
In other embodiments, as shown in connection with fig. 10, the rib score 25 comprises two arcuate scores, the ends of which intersect the perimeter score 22, the two arcuate scores having no overlapping area.
In other embodiments, as shown in connection with fig. 11, the rib score 25 is configured as a Y-shaped score, at least one end of the Y-shaped score intersecting the perimeter score 22; as shown in connection with fig. 12, the rib score 25 is configured as a fold-line score, at least one end of which intersects the peripheral score 22.
In other embodiments, as shown in connection with fig. 13, the rib score 25 is configured as a plurality of linear scores, and the plurality of linear scores are not connected to the peripheral score 22 and do not intersect each other.
As a variant, the rib scores 25 can also be configured in other ways.
In some embodiments, the bead score 25 is located in a central region of the groove face 23.
Further, the rib scores 25 are arranged symmetrically along the central axis of the length direction of the explosion-proof valve, and/or the rib scores 25 are arranged symmetrically along the central axis of the width direction of the explosion-proof valve.
In some embodiments, the thickness d0 of the overlap portion 21 of the explosion proof valve has a value in the range of 0.4 mm.ltoreq.d0.ltoreq.0.6 mm.
In some embodiments, the thickness d4=d0-d 1 of the compression part 26, where d0 is the thickness of the overlap portion 21 and d1 is the difference in height between the groove surface 23 and the overlap portion 21 in a direction perpendicular to the overlap portion 21.
Alternatively, the thickness d4 of the compacting section 26 may have a value in the range of 0.25mm < d4 < 0.35mm.
In some embodiments, as shown in connection with FIG. 6, the difference in height between the groove surface 23 and the overlap portion 21 in the direction perpendicular to the overlap portion 21 is d1, and 0.15 mm.ltoreq.d1.ltoreq.0.35 mm is satisfied.
By limiting the lower limit of the height difference d1 between the groove surface 23 and the overlap edge portion 21, smooth opening of the explosion-proof valve can be ensured, difficulty in opening caused by too thick groove surface 23 is avoided, welding requirements of the overlap edge portion 21 and the body 1 are met, and welding difficulty caused by too thin overlap edge portion 21 is avoided. Meanwhile, by limiting the upper limit of the height difference d1 between the groove surface 23 and the overlap portion 21, accumulation of the material of the overlap portion 21 caused by excessive difference between the two planes can be avoided, and influence of excessive density on product performance can be avoided.
Alternatively, the height difference d1 between the groove surface 23 and the overlap portion 21 may take a value of 0.15mm or 0.16mm or 0.17mm or 0.18mm or 0.19mm or the like.
In some embodiments, as shown in connection with fig. 4, the peripheral score 22 is continuously and non-closed-loop disposed at the outer periphery of the groove face 23, the groove face 23 forming a compressive portion 26 in the region adjacent to the lap portion 21 where the peripheral score 22 is not disposed.
Alternatively, the overlap portion 21 of the explosion-proof valve is constructed in a racetrack-type structure including straight line segments disposed in parallel on both sides of the explosion-proof valve in the width direction, and circular arc segments disposed on both ends of the straight line segments in the length direction.
The groove surface 23 is continuously provided inside the lap portion 21.
In the present embodiment, the compacting portion 26 corresponds to one of the straight line segments of the racetrack structure, and the length of the compacting portion 26 is Z, and Z satisfies: Z=Y- (4 mm-6 mm), wherein Y is the center distance between two semicircular centers of the arc sections at the two ends of the length direction of the straight line section.
According to the explosion-proof valve provided by the embodiment of the invention, the peripheral scores 22 are continuously and non-closed-loop arranged on the periphery of the groove surface 23, and the groove surface 23 forms the compression part 26 in the area which is adjacent to the overlap edge part 21 and is not provided with the peripheral scores 22, so that when the explosion-proof valve is subjected to pressure, explosion can be carried out along the path formed by the peripheral scores 22, the exploded groove surface 23 is kept connected with the overlap edge part 21 through the compression part 26, the opening area of the explosion-proof valve is ensured, the exploded groove surface 23 can be prevented from flying out, other external structures are prevented from being damaged when the exploded groove surface 23 moves in height, and meanwhile, the explosion-proof valve of other batteries is prevented from being blocked by the groove surface 23 after flying out, and short circuits are prevented from being caused by accidental overlapping.
As shown in fig. 15, when the groove surface 23 forms the pressing portion 26 in the region adjacent to the overlap portion 21 where the peripheral score 22 is not provided, the explosion-proof valve can be exploded along the path of the peripheral score 22, and the exploded groove surface 23 can be kept connected to the overlap portion 21 by the pressing portion 26, and the escape of the exploded groove surface 23 can be prevented while ensuring the opening area of the explosion-proof valve. As can be seen from fig. 15, even if the rib score 25 is formed on the groove surface 23, since the residual thickness d3 of the rib score 25 is greater than the residual thickness d2 of the peripheral score 22, the explosion-proof valve will preferentially burst from the path defined by the peripheral score 22, but will not burst from the path of the rib score 25, so that the rib score 25 only has a structural reinforcing effect, and the area after opening is ensured to be sufficiently large. The original perimeter score 22 forms an opening path with fewer burrs and a smoother opening.
According to an embodiment of the present invention, in another aspect, there is also provided a battery including:
the body 1, the body 1 is provided with the vent hole 12, and the area of the body 1 corresponding to the vent hole 12 is also provided with a containing groove which is suitable for containing the explosion-proof valve.
The explosion-proof valve is arranged in the accommodating groove and is welded with the body 1 through the overlap edge part 21 to realize sealing connection.
In some embodiments, as shown in connection with fig. 1, the minimum distance between the welding mark formed by welding the explosion-proof valve and the containing groove and the edge of the body 1 is f in a plane parallel to the plane of the body 1, and f > 4mm is satisfied.
The minimum distance between the explosion-proof valve and the edge of the body 1 formed by welding the explosion-proof valve and the accommodating groove is larger than 4mm, so that the influence of the battery cell manufacturing process on the explosion-proof valve, such as the operation of peripheral welding of a shell cover and the like, is reduced, the stress balance of the explosion-proof valve is ensured, the influence of external force on the explosion-proof valve is reduced, and the opening condition of the explosion-proof valve is accurate and controllable.
In this embodiment, the body 1 may include a battery cover plate, and may further include a housing 3.
In some embodiments, as shown in connection with fig. 3, the depth of the receiving groove is a1 and the thickness of the overlap portion 21 of the explosion-proof valve is d0, perpendicular to the plane of the body 1; the explosion-proof valve is contained in the containing groove, and satisfies: a1-d0 is more than or equal to 0mm and less than or equal to 0.2mm;
wherein the value range of a1 is more than or equal to 0.5mm and less than or equal to 0.6mm.
The depth a1 of the accommodating groove is larger than the thickness d0 of the lapping edge part 21 of the explosion-proof valve, so that the accommodating groove can be ensured to completely accommodate the explosion-proof valve, smooth assembly and welding of the explosion-proof valve and the optical aluminum plate are ensured, and if the height difference of the two is lower than 0mm, the explosion-proof valve is easy to protrude out of the body 1 and is easy to wear; if the height difference is more than 0.1mm, poor welding is likely to occur when the explosion-proof valve is welded to the body 1.
In this embodiment, the thickness d0 of the overlap portion 21 of the explosion-proof valve may have a value ranging from 0.4mm to 0.6mm.
In the direction parallel to the groove surface 23, the value range of the width L1 of the lapping edge part 21 is 2mm less than or equal to L1 less than or equal to 3mm, and if the value is less than 2mm, the stamping and the subsequent welding of the explosion-proof valve and the optical aluminum plate are not facilitated; if the diameter is larger than 3mm, the area waste is caused, and the effective opening area of the explosion-proof valve is lost in the limited explosion-proof valve area.
The effective opening area of the explosion vent is the area defined by the area within the perimeter score 22.
In some embodiments, as shown in connection with fig. 3, the perimeter score 22 is located within the projected extent of the vent hole 12 in a plane perpendicular to the plane of the body 1; and in the direction parallel to the groove face 23, the minimum distance between the peripheral score 22 and the vent hole 12 at the edge of the body 1 is c, and satisfies: c is more than or equal to 1mm and less than or equal to 2mm.
Since the peripheral score 22 is located within the projection range of the vent hole 12, interference of the vent hole 12 with the opening area of the groove surface 23 can be avoided when the explosion-proof valve is opened along the peripheral score 22.
Meanwhile, by limiting the lower limit of the minimum distance c between the peripheral score 22 and the vent hole 12 at the edge of the body 1 in the direction parallel to the groove surface 23, interference of the vent hole 12 to the opening area of the groove surface 23 can be avoided, and by limiting the upper limit of the minimum distance c between the peripheral score 22 and the vent hole 12 at the edge of the body 1 in the direction parallel to the groove surface 23, a sufficient opening area of the explosion-proof valve can be ensured, and oversized opening of the vent hole 12 can be avoided.
In other embodiments, as shown in fig. 16, the housing 3 of the battery is provided with a vent hole 12, and a receiving groove is formed in a region of the housing 3 corresponding to the vent hole 12, and the explosion-proof valve 2 is fixedly connected with the housing 3. It should be noted that the exhaust hole 12 may be formed on the housing 3 of the battery or on the battery cover plate, and the corresponding explosion-proof valve 2 may be formed on the housing 3 of the battery or on the battery cover plate, so long as the requirement of exhaust and pressure relief is satisfied.
In conjunction with table 1 below, the opening effect of the explosion-proof valve provided by the examples of the present invention is verified by several groups of test examples.
Example 1: the length dimension of the explosion-proof valve is 31.7mm, the width dimension is 19.7mm, the thickness d0 of the lapping part 21 of the explosion-proof valve is 0.5mm, the thickness d4 of the compression part 26 is 0.3mm, the residual thickness d2 of the peripheral notch 22 is 0.12mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.20mm, the length Z of the compression part 26 is 6mm, the explosion test is carried out on the cover plate, the explosion pressure is measured to be 0.605Mpa, and the explosion-proof valve is smoothly exploded along the peripheral notch 22;
example 2: the length dimension of the explosion-proof valve is 45mm, the width dimension is 27mm, the thickness d0 of the lapping part 21 of the explosion-proof valve is 0.55mm, the thickness d4 of the pressing part 26 is 0.35mm, the residual thickness d2 of the peripheral notch 22 is 0.16mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.25mm, the length Z of the pressing part 26 is 6mm, the explosion test is carried out on the cover plate, the explosion pressure is measured to be 0.895Mpa, and the explosion-proof valve is smoothly exploded along the peripheral notch 22;
example 3: the length dimension of the explosion-proof valve is 31.7mm, the width dimension is 19.7mm, the thickness d0 of the overlap part 21 of the explosion-proof valve is 0.5mm, the thickness d4 of the compression part 26 is 0.3mm, the residual thickness d2 of the peripheral notch 22 is 0.12mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.20mm, the length Z of the compression part 26 is 6mm, the breathing test is carried out, the internal and external pressure difference is 0.1Mpa, the test is carried out for 5 ten thousand times, then the explosion test is carried out on the cover plate, the explosion-proof valve is successfully exploded along the peripheral notch 22, the explosion pressure is measured to be 0.590Mpa (the explosion pressure design value is 0.6+/-0.2 Mpa), and the visible explosion pressure meets the design requirement;
example 4: the length dimension of the explosion-proof valve is 31.7mm, the width dimension is 19.7mm, the thickness d0 of the lapping part 21 of the explosion-proof valve is 0.5mm, the thickness d4 of the pressing part 26 is 0.3mm, the residual thickness d2 of the peripheral notch 22 is 0.15mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.20mm, the length Z of the pressing part 26 is 6mm, the explosion test is carried out on the cover plate, the explosion pressure is measured to be 0.585Mpa, and the explosion-proof valve is smoothly exploded along the peripheral notch 22;
comparative example 1: the length dimension of the explosion-proof valve is 31.7mm, the width dimension is 19.7mm, the thickness d0 of the lapping edge part 21 of the explosion-proof valve is 0.5mm, the thickness d4 of the compressive part 26 is 0.3mm, the residual thickness d2 of the peripheral notch 22 is 0.12mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.13mm, the length Z of the compressive part 26 is 6mm, the cover plate explosion test shows that the explosion pressure is 0.635Mpa, the explosion-proof valve is not exploded along the peripheral notch 22, but is exploded along the reinforcing rib notch 25, so that the air leakage area after opening is small;
comparative example 2: the length dimension of the explosion-proof valve is 31.7mm, the width dimension is 19.7mm, the thickness d0 of the overlap part 21 of the explosion-proof valve is 0.5mm, the thickness d4 of the compression part 26 is 0.3mm, the residual thickness d2 of the peripheral notch 22 is 0.12mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.14mm, the length Z of the compression part 26 is 6mm, the cover plate explosion test shows that the explosion pressure is 0.645Mpa, the explosion-proof valve does not explode along the peripheral notch 22, but explodes along the reinforcing rib notch 25, so that the air leakage area after opening is small (as shown in fig. 9);
comparative example 3: the length dimension of the explosion-proof valve is 31.7mm, the width dimension is 19.7mm, the thickness d0 of the overlap part 21 of the explosion-proof valve is 0.5mm, the thickness d4 of the compression part 26 is 0.3mm, the residual thickness d2 of the peripheral notch 22 is 0.08mm, the residual thickness d3 of the reinforcing rib notch 25 is 0.20mm, the length Z of the compression part 26 is 6mm, the breathing test is carried out, the internal and external pressure difference is 0.1Mpa, the test is carried out for 5 ten thousand times, then the cover plate is subjected to the explosion test, the explosion pressure is measured to be 0.349Mpa (the explosion pressure design value is 0.6+/-0.2 Mpa), and the explosion pressure does not meet the design requirement.
TABLE 1
The middle position of the explosion-proof valve is provided with the reinforcing rib, so that the fatigue resistance of the explosion-proof valve can be enhanced.
The material system of the cell includes various, for example: lithium iron phosphate (LFP), ternary lithium (NCM), lithium manganese iron phosphate, cobalt-free systems, sodium electricity, and the like. The explosion pressure of the explosion-proof valve of the LFP can be selected to be 0.4Mpa-0.8Mpa; the burst pressure of the NCM explosion-proof valve can be selected to be 0.7Mpa-1.2Mpa; the explosion pressure of the explosion-proof valve of the cobalt-free system can be selected to be 0.8Mpa-1.2Mpa; the bursting pressure of the sodium-electricity explosion-proof valve can be selected to be 0.7Mpa-1.1Mpa. In addition, the explosion pressure of the explosion-proof valve of the semi-solid battery/all-solid battery can be selected to be 0.7Mpa-1.2Mpa; the patent defines and protects parameters from the explosion-proof valve size square, but is not limited to the system.
In some embodiments, the battery is sized to: the battery length is 100mm-600mm, the battery width is 50mm-250mm, and the battery height is 10mm-100mm; alternatively, the battery may be sized to: the battery length is 600mm-1500mm, the battery width is 50mm-250mm, and the battery height is 10mm-100mm.
Alternatively, as shown in FIG. 3, the thickness a0 of the housing has a value in the range of 1.0 mm.ltoreq.a0.ltoreq.1.5 mm. In order to meet the requirements of welding and shell strength, the depth a1 of the corresponding matched accommodating groove is 0.5 mm-0.6 mm.
The side of the explosion proof valve having the peripheral score 22 may be mounted toward the interior side of the housing; as a variant, the side of the explosion-proof valve with the peripheral score 22 can also be mounted towards the outer side of the housing. When the explosion-proof valve is installed with the side with the peripheral notch 22 facing the inner side of the shell, damage to the notch of the explosion-proof valve caused by external contact can be effectively prevented, but the explosion-proof valve is corroded by electrolyte to reduce the detonation pressure (the electrolyte can generate hydrofluoric acid HF only when meeting water environment, and the HF can corrode residual thickness is worth focusing). When the side of the explosion-proof valve with the peripheral notch 22 faces to one side outside the shell, electrolyte in the battery core can be prevented from corroding the residual thickness of the notch of the explosion-proof valve, but the risk that the notch surface of the explosion-proof valve is interfered possibly exists, and a new explosion-proof valve protection sheet is needed, so that the problem of flatness of the bottom is brought, and the bottom of the battery core is uneven.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Although the embodiments of the present invention have been described with reference to the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the claims.
Claims (10)
1. An explosion-proof valve, comprising:
a groove surface and a lapping part surrounding the circumferential edge of the groove surface;
at least part of the groove surface close to the lapping part is concavely provided with a peripheral notch;
the groove surface is also provided with a reinforcing rib notch, the reinforcing rib notch is positioned at one side of the peripheral notch away from the overlap edge part, and at least part of the reinforcing rib notch is not overlapped with the projection of the peripheral notch in the direction perpendicular to the overlap edge part;
in the direction perpendicular to the overlap portion, the residual thickness of the peripheral scores is d2, and the residual thickness of the reinforcing rib scores is d3, which satisfies the following conditions: d3-d2 is less than or equal to 30 mu m and less than or equal to 100 mu m.
2. The explosion valve of claim 1, wherein the residual thickness d2 of the perimeter score has a range of values: d2 is more than or equal to 60 mu m and less than or equal to 180 mu m;
and/or, the residual thickness d3 of the reinforcing rib nick has the following value range: d3 is not less than 120 mu m and not more than 180 mu m.
3. The explosion proof valve of claim 1, wherein said bead score is recessed from said groove face.
4. The explosion vent as set forth in claim 1, wherein said bead score includes at least two arcuate scores, the ends of the arcuate scores intersecting said perimeter score and the at least two arcuate score portions overlapping to form a score overlap;
or, the reinforcing rib notch comprises at least two arc-shaped notches, two ends of each arc-shaped notch are intersected with the peripheral notch, and the at least two arc-shaped notches are not overlapped with each other;
or, the reinforcing rib notch is configured as a Y-shaped notch, and at least one end of the Y-shaped notch is intersected with the peripheral notch;
or, the reinforcing rib notch is configured as a broken line type notch, and at least one end head of the broken line type notch is intersected with the peripheral notch;
alternatively, the rib score is configured as a plurality of linear scores, and the plurality of linear scores are not connected with the peripheral score, and the plurality of linear scores do not intersect each other.
5. The explosion protection valve of claim 4, wherein said bead score is located in a central region of said groove face.
6. The explosion proof valve of claim 5, wherein the stiffener score is disposed symmetrically along a central axis of the explosion proof valve in a length direction and/or the stiffener score is disposed symmetrically along a central axis of the explosion proof valve in a width direction.
7. The explosion protection valve according to any one of claims 1 to 6, wherein the thickness d0 of the overlap portion of the explosion protection valve has a value ranging from 0.4mm to 0.6mm.
8. The explosion-proof valve according to any one of claims 1 to 6, wherein a height difference d1 between the groove surface and the overlap portion in a direction perpendicular to the overlap portion has a value in a range of 0.15 mm.ltoreq.d1.ltoreq.0.35 mm.
9. A battery, comprising:
a body, the body is provided with an exhaust hole, the region of the body corresponding to the exhaust hole is also provided with a containing groove, and the containing groove is suitable for containing the explosion-proof valve as claimed in any one of the claims 1 to 8.
10. The battery of claim 9, wherein the battery is sized to: the battery length is 100mm-600mm, the battery width is 50mm-250mm, and the battery height is 10mm-100mm; alternatively, the battery may be sized to: the battery length is 600mm-1500mm, the battery width is 50mm-250mm, and the battery height is 10mm-100mm.
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