CN114937849A - Explosion-proof valve, battery cover plate assembly and power battery - Google Patents
Explosion-proof valve, battery cover plate assembly and power battery Download PDFInfo
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- CN114937849A CN114937849A CN202210312799.2A CN202210312799A CN114937849A CN 114937849 A CN114937849 A CN 114937849A CN 202210312799 A CN202210312799 A CN 202210312799A CN 114937849 A CN114937849 A CN 114937849A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention belongs to the technical field of power batteries, and particularly discloses an explosion-proof valve, a battery cover plate assembly and a power battery. According to the explosion-proof valve provided by the invention, the valve body part is protruded along the thickness direction to form the convex body, then the explosion-proof nick is etched around the periphery of the convex body, so that the shock resistance strength of the valve opening surface is enhanced, meanwhile, the valve opening surface can have enough elastic deformation space, the pulling stress generated by expansion with heat and contraction with cold during laser welding of the explosion-proof valve and the cover body is eliminated, the nick position can be effectively prevented from cracking, and the direct impact/damage to the nick (explosion-proof line) position caused by expansion with heat and contraction with cold or ultrasonic welding vibration in the battery assembly production process can be greatly reduced.
Description
Technical Field
The invention belongs to the technical field of power batteries, and particularly relates to an explosion-proof valve, a battery cover plate assembly and a power battery.
Background
With the continuous progress of science and technology and the continuous enhancement of environmental awareness of people, more and more electronic products select rechargeable secondary batteries as power sources, such as electronic devices like music players, cameras, portable computers, electric vehicles and the like, which provides a wide space for the application and development of the rechargeable secondary batteries.
Electric automobile and energy storage power station etc. generally need use the power battery who has the large capacity as the power, and for pure electric vehicles, insert the power battery that equipment such as electric hybrid vehicle and electric bicycle provided power source, mainly adopt the aluminum hull to hold the lithium cell and set up the structure of explosion-proof valve in apron department at present, the explosion-proof valve is the thin wall valve body on the battery sealing board, when battery internal pressure exceeded the specified value, explosion-proof valve body broke, released internal pressure, avoided the battery to burst.
At present, the opening valve face of the explosion-proof valve of the power battery adopts a structure of adding nicks (explosion-proof lines) on a plane, the nicks (explosion-proof lines) are designed to be very thin in order to ensure that the explosion-proof valve can be effectively opened when abnormity occurs, and therefore the explosion value consistency is poor due to the fact that the nicks (explosion-proof lines) are easily interfered by process factors in the production of the explosion-proof valve, the assembly production of a cover body or the production of the battery, and even the problem that the explosion-proof valve directly cracks can occur in the production process.
Disclosure of Invention
One of the objects of the present invention is: aiming at the defects existing in the prior art, the explosion-proof valve is provided, the problem that the existing explosion-proof valve is easy to crack is solved, the shock resistance of the explosion-proof valve is also improved, and the production yield of batteries is further improved.
In order to achieve the purpose, the invention adopts the following technical scheme: an explosion-proof valve comprises a valve body and a convex body formed by the valve body protruding along the thickness direction, wherein explosion-proof scores are arranged around the outer side of the convex body.
Further, the valve body comprises a first base body and a second base body, the first base body is arranged on the periphery of the second base body in a surrounding mode, and the thickness of the first base body is larger than or equal to that of the second base body.
Furthermore, the convex body is in a circular shape or an elliptical shape and is positioned in the middle of the second base body, or the convex body is in an annular shape and surrounds the central axis of the second base body.
Further, the convex body comprises a connecting portion and a main body portion, two ends of the main body portion are connected with the valve body through the connecting portion, and the connecting portion is arc-shaped.
Further, the height h1 of the convex body is greater than or equal to 0.1 mm.
Furthermore, the ratio of the area formed by enclosing the convex bodies to the area formed by enclosing the second base body is greater than or equal to 0.4.
Further, the distance between the explosion-proof score and the convex body is less than or equal to 1 mm.
Further, the valve body is circular or oval.
The second purpose of the invention is: the battery cover plate component comprises a cover body and the explosion-proof valve, wherein the explosion-proof valve is arranged on the cover body, so that the production yield of the battery is improved, and the service life of the battery is prolonged.
The third purpose of the invention is that: the power battery comprises a battery core, a shell for accommodating the battery core and the battery cover plate assembly, wherein the battery cover plate assembly is connected to at least one end of the shell in a sealing mode.
The invention has the beneficial effects that: the explosion-proof valve comprises a valve body and a convex body formed by the valve body protruding along the thickness direction of the valve body, wherein explosion-proof scores are arranged around the outer side of the convex body. According to the explosion-proof valve provided by the invention, the valve body part is protruded along the thickness direction to form the convex body, then the explosion-proof nick is etched around the periphery of the convex body, so that the shock resistance strength of the valve opening surface is enhanced, meanwhile, the valve opening surface can have enough elastic deformation space, the pulling stress generated by expansion with heat and contraction with cold during laser welding of the explosion-proof valve and the cover body is eliminated, the nick position can be effectively prevented from cracking, and the direct impact/damage to the nick (explosion-proof line) position caused by expansion with heat and contraction with cold or ultrasonic welding vibration in the battery assembly production process can be greatly reduced.
Drawings
Fig. 1 is a schematic structural view of a power battery in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a battery cover plate assembly in embodiment 1 of the present invention;
FIG. 3 is a schematic view of an oval explosion-proof valve in embodiment 1 of the invention;
fig. 4 is a schematic view of a circular explosion-proof valve in embodiment 1 of the present invention;
fig. 5 is a schematic structural view of an explosion-proof valve in embodiment 1 of the invention;
FIG. 6 is a schematic structural view of an explosion-proof valve in embodiment 2 of the invention;
FIG. 7 is an enlarged view of part A of FIG. 6;
fig. 8 is a schematic structural view of an explosion-proof valve in embodiment 3 of the invention;
FIG. 9 is a schematic structural view of an explosion-proof valve in embodiment 4 of the invention;
FIG. 10 is a schematic view showing the areas of the protrusions and the second base in example 2 of the present invention;
fig. 11 is a schematic area diagram of protrusions and a second base respectively formed by surrounding in example 4 of the present invention;
FIG. 12 is a schematic diagram of the shot value distribution of a conventional explosion-proof valve;
fig. 13 is a diagram showing the distribution of the explosion proof valve in example 1 of the present invention.
Wherein:
1. an explosion-proof valve; 11. a valve body; 111. a first substrate; 112. a second substrate; 112a, a central axis; 12. a convex body; 121. a connecting portion; 122. a main body part; h1, height of the convex body; s1, forming an area surrounded by the convex body; s2, the area formed by the second substrate in an enclosing mode; 13. explosion-proof nicking; l1, distance between the vent score and the boss;
2. a battery cover plate assembly; 21. a cover body;
3. a power battery; 31. an electric core; 32. a housing; 33. a first lead-out terminal; 34. and a second terminal.
Detailed Description
In the description of the application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the invention.
In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the terms "connected," "secured," and the like are to be construed broadly and encompass, for example, a fixed connection, a removable connection, an integral connection, or an electrical connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
It will be evident to those skilled in the art that the invention is not limited to the details of the exemplary embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to specific embodiments and drawings of the specification, but the embodiments of the present invention are not limited thereto.
Example 1
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a power battery 3 in embodiment 1 of the present invention.
The power battery 3 provided in embodiment 1 of the present invention includes a battery core 31, a casing 32, and a battery cover assembly 2, where the battery core 31 is placed in a receiving cavity of the casing 32, the battery cover assembly 2 is used to cover an open port of the casing 32, and the battery cover assembly 2 may be hermetically connected to an upper port of the casing 32 by ultrasonic welding or laser welding.
The battery core 31 is made of a positive electrode sheet, a negative electrode sheet and a diaphragm by winding or stacking.
The positive electrode sheet may be any material suitable for use as a positive electrode sheet of the power battery 3 in the art, for example, the positive electrode sheet may include, but is not limited to, a metal foil, and the like, and more specifically, may include, but is not limited to, an aluminum foil, and the like.
The positive electrode sheet comprises a positive electrode current collector and a positive electrode active layer arranged on the positive electrode current collector, wherein the positive electrode active layer comprises m positive electrode active sublayers, and a positive electrode active material in each positive electrode active sublayer comprises but is not limited to one or more of LiCoO2, LiNiO2, LiVO2, LiCrO2, LiMn2O4, LiCoMnO4, Li2NiMn3O8, LiNi0.5Mn1.5O4, LiCoPO4, LiMnPO4, LiFePO4, LiNiPO4, LiCoFSO4, CuS2, FeS2, MoS2, NiS, TiS2 and the like. In another embodiment, the positive electrode active material is further modified, for example, the positive electrode active material may be modified by coating, doping, etc., and the material used in the modification may be one or a combination of more of Al, B, P, Zr, Si, Ti, Ge, Sn, Mg, Ce, W, etc., but the modification method of the positive electrode active material should be known to those skilled in the art.
The negative electrode sheet may be any of various materials suitable for use as a negative electrode sheet for a power cell 3 in the art, including, but not limited to, copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, or a polymer substrate coated with a conductive metal, and combinations thereof.
The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer on the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material, a binder, and a conductive material. Among them, the negative active material includes, but is not limited to: lithium metal, structured lithium metal, natural graphite, artificial graphite, mesophase micro carbon spheres (MCMB), hard carbon, soft carbon, silicon carbon composites, or any combination thereof. Wherein silicon carbon composite means at least about 5 wt% silicon based on the weight of the silicon carbon negative electrode active material.
When the negative electrode includes an alloy material, the negative electrode active material layer can be formed by a method such as an evaporation method, a sputtering method, or a plating method. When the anode includes lithium metal, the anode active material layer is formed, for example, with a conductive skeleton having a spherical strand shape and metal particles dispersed in the conductive skeleton. In some embodiments, the spherical-strand shaped conductive skeleton may have a porosity of about 5% to about 85%. In some embodiments, a protective layer may also be disposed on the lithium metal anode active material layer.
As shown in fig. 1, the power battery 3 according to the embodiment of the present invention further includes a first lead-out terminal 33 and a second lead-out terminal 34, wherein tabs led out from the positive plate and the negative plate are respectively connected to the first lead-out terminal 33 and the second lead-out terminal 34, and the first lead-out terminal 33 and the second lead-out terminal 34 are made of a conductive material.
Referring to fig. 2, fig. 2 is a schematic structural view of a battery cover plate assembly 2 in embodiment 1 of the present invention.
The battery cover plate assembly 2 includes a cover body 21 and an explosion-proof valve 1 disposed on the cover body 21, wherein the explosion-proof valve 1 is located at a central position of the cover body 21, or the explosion-proof valve 1 is disposed at a non-central position of the cover body 21.
Preferably, the cover 21 has a first through hole and a second through hole, the first lead-out terminal 33 passes through the first through hole and extends outward and protrudes, the second lead-out terminal 34 passes through the second through hole and extends outward and protrudes, it should be noted that a first insulating sealing member is disposed between the first lead-out terminal 33 and the first through hole for sealing a gap between the first lead-out terminal 33 and the first through hole, and a second insulating sealing member is disposed between the second lead-out terminal 34 and the second through hole for sealing a gap between the second lead-out terminal 34 and the second through hole.
Referring to fig. 3 to 5, fig. 3 to 5 show structural schematic views of the explosion-proof valve 1 in embodiment 1 of the present invention.
As shown in fig. 5, the explosion-proof valve provided by embodiment 1 of the present invention includes a valve body 11 and a convex body 12 formed by partially protruding the valve body 11 in a thickness direction thereof, and an explosion-proof score 13 is provided around an outer side of the convex body 12. Specifically, in this embodiment 1, the convex body 12 is formed by the regional protrusion of the middle part of the valve body 11 to the direction that is close to electric core 31, the convex body 12 is circular form or oval shape, draw explosion-proof nick 13 in the position that is less than or equal to 1mm apart from the convex body 12, the shock resistance of the valve opening face has been strengthened, and simultaneously, make the valve opening face can have sufficient elastic deformation space, eliminate the pull stress that explosion-proof valve 1 and lid 21 produced when laser welding because expend with heat and contract with cold, can effectively prevent nick position fracture, can greatly reduced because expend with heat and contract with cold or ultrasonic welding vibrations in the battery assembly production process to the direct impact/destruction that nick (explosion-proof line) position led to the fact. It should be noted that the shape of the convex body 12 of the present invention is not limited to the circular shape or the oval shape defined in the embodiment 1, and it may also be a triangular shape, a square shape or an irregular shape, and those skilled in the art can make appropriate modifications to the shape of the convex body 12 in combination with practical production experience, and any obvious modifications, substitutions or variations to the shape of the convex body 12 made by those skilled in the art on the basis of the present invention are within the protection scope of the present invention.
Preferably, the convex body 12 is formed by a convex bulge in the middle area of the second base body 112 (the area occupying 40% of the upper end surface area of the second base body 112) towards the direction close to the battery cell 31, and the height h1 of the convex body is 0.2mm, compared with the conventional explosion-proof valve structure, the structure is designed so that the radial direction of the valve opening surface has enough deformation space, the pulling stress generated by thermal expansion and cold contraction during laser welding of the explosion-proof valve 1 and the cover body 21 can be eliminated, and the nick site is prevented from cracking. It should be noted that, after a lot of experiments, the present invention repeatedly verifies and concludes that, when the ratio of the area S1 defined by the protrusion and the area S2 defined by the second base is greater than or equal to 0.4, a sufficient deformation space can be provided in the radial direction of the valve opening surface, so as to offset the pulling stress generated by thermal expansion and cold contraction during laser welding of the explosion-proof valve 1 and the cover 21, and in the process of laser welding of the explosion-proof valve 1 and the cover 21, the probability of the notch position being cracked due to thermal expansion and cold contraction is reduced to 1%, compared with the current common laser welding, which is 15% of the probability of the notch position being cracked, by using the explosion-proof valve 1 provided in embodiment 1 of the present invention, the risk of the notch position being cracked can be greatly reduced, and the production yield of the battery is improved. It is worth mentioning that when the ratio of the area S1 formed by the protrusion body and the area S2 formed by the second base body is larger than or equal to 0.4, the shock resistance of the whole valve opening face can be improved, and the direct impact/damage to the nick (explosion-proof line) position caused by thermal expansion and cold contraction or ultrasonic welding shock in the battery assembly production process is greatly reduced. In another embodiment, the ratio of the area S1 enclosed by the protrusions to the area S2 enclosed by the second base is 0.5-0.8, and the ratio of the area S1 enclosed by the protrusions to the area S2 enclosed by the second base is preferably 0.5, 0.6, 0.7 or 0.8.
Preferably, the distance between the anti-explosion notch 13 and the convex body 12 in embodiment 1 of the present invention is less than or equal to 1mm, and the ratio of the area S1 formed by the enclosing of the convex body to the area S2 formed by the enclosing of the second base body is greater than or equal to 0.4, so that the pressure relief channel of the anti-explosion valve 1 in the embodiment of the present invention is wide, when the battery has abnormal conditions such as short circuit, overcharge, overdischarge, and the like, the internal pressure of the battery rises sharply, the pressure reaches the set battery anti-explosion pressure point, and the valve body 11 can be opened instantaneously from the notch, so as to ensure that the gas in the battery can be discharged in time, prevent the battery from generating explosion energy and instantly leaking completely, and achieve the purpose of explosion prevention.
Compare with conventional explosion-proof valve, explosion-proof nick 13 in the explosion-proof valve 1 that this embodiment 1 provided is when the battery abnormal conditions such as short circuit, overcharge, overdischarge appear, and battery internal pressure sharply risees promptly, and when pressure reached the battery explosion-proof pressure point that sets up, the nick position can form stress concentration point fast to can reduce the reliance that requires high to explosion-proof valve material uniformity or stability itself, help improving the pressure release uniformity of explosion-proof valve open valve.
Preferably, the cross-section of the explosion-proof valve 1 includes, but is not limited to, trapezoidal, triangular and square.
The valve body 11 in embodiment 1 of the present invention includes a first base 111 and a second base 112, the first base 111 is disposed around the periphery of the second base 112, and the thickness of the first base 111 is greater than or equal to the thickness of the second base 112. The first base body 111 and the second base body 112 are manufactured by an integral forming process, the upper end face of the first base body 111 and the upper end face of the second base body 112 are flush or have a height difference, the height difference is 0.1-0.8 mm, and the lower end face of the first base body 111 and the lower end face of the second base body 112 are flush.
Preferably, the convex body 12 includes a connecting portion 121 and a main body portion 122, both ends of the main body portion 122 are connected with the valve body 11 through the connecting portion 121, and the connecting portion 121 is arc-shaped. In this embodiment, through connecting portion 121 rounding off connection between main part 122 and the valve body 11, make the stress distribution that connecting portion 121 received even, when the increase of battery internal pressure value, can avoid stress concentration at connecting portion 121, but make stress concentration have explosion-proof nick 13's position at the sculpture, pressure reaches the battery explosion-proof pressure point that sets up, valve body 11 can be followed nick department and opened in the twinkling of an eye, in order to guarantee that battery internal gas can in time discharge, prevent that the battery from producing the explosion and can play completely disappointing in the twinkling of an eye, reach explosion-proof purpose.
Preferably, the height h1 of the spur is greater than or equal to 0.1 mm. The height h1 of the convex body is preferably 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm, so that the valve opening surface has enough deformable space for the pulling stress generated by thermal expansion and contraction during laser welding of the explosion-proof valve 1 and the cover body 21. Through experimental verification many times, if the height h1 of convex body is less than 0.1mm, will make the deformable space who opens the valve face reduce, lead to at the in-process of explosion-proof valve of laser welding and lid, because expend with heat and contract with cold lead to the pulling stress of valve body to concentrate on the nick position, finally make the nick position tear under the effect of pulling stress.
Preferably, the valve body 11 is circular or oval.
The explosion-proof valve of the embodiment 1 is tested in the following experiment. The method comprises the following specific steps:
1. breath fatigue test
The instrument comprises the following steps: a cyclic stress tester;
the test flow comprises the following steps:
(1) placing the battery cover plate assembly into a clamp, and locking and sealing;
(2) setting test conditions: respectively setting the air pressure and the pressurizing time from inside to outside/from outside to inside according to different gradients, and setting air leakage alarm air pressure;
(3) confirming that the test system is normal (no air leakage point);
(4) starting the instrument, pressurizing and maintaining the pressure from inside to outside and from outside to inside, and circulating the steps until the air leakage alarm is given out;
(5) confirmation of red oil penetration was performed.
Battery cover plate assembly 2 respiration fatigue test
2. Breath burst test
The instrument comprises the following steps: respiratory explosion tester
The test flow comprises the following steps:
(1) placing the battery cover plate assembly into a clamp, and locking and sealing;
(2) setting test conditions: the explosion-proof valve 1 applies 0.30MPa from inside to outside and applies 0.15MPa of air pressure from outside to inside, each state lasts for 30S, air does not leak after 10 cycles of breath test, and the explosion air pressure is not lower than 0.4 MPa.
Through tests, as shown in fig. 12 to 13 below, the explosion-proof valve 1 provided in embodiment 1 of the present invention applies 0.30MPa from inside to outside and 0.15MPa from outside to inside, each state lasts for 30S, no air leakage occurs after 10 cycles of a breath test, and the explosion air pressure is higher than or equal to 0.4 MPa.
To sum up, the battery cover plate assembly 2 manufactured by the explosion-proof valve 1 provided by the embodiment 1 can ensure that the battery cover plate assembly 2 has no air leakage point when the applied air pressure is 0.19MPa, the applied time is 30s, and the cycle number is maintained at 500-700.
Example 2
As shown in fig. 6 to 7, different from embodiment 1, the explosion-proof valve provided in embodiment 2 includes a valve body 11 and a convex body 12, where the convex body 12 is formed by protruding a middle region of the valve body 11 in a direction away from the battery cell 31, the valve body 11 includes a first base 111 and a second base 112, the first base 111 is disposed around the periphery of the second base 112, the thickness of the first base 111 is greater than or equal to that of the second base 112, and the convex body 12 is circular or elliptical and is located at a middle position of the second base 112.
The other structures are the same as those of embodiment 1, and are not described herein again.
Example 3
As shown in fig. 8, different from embodiment 1, the explosion-proof valve provided in embodiment 3 includes a valve body 11 and a convex body 12, where the convex body 12 is formed by protruding a partial region of the valve body 11 in a direction approaching to the battery cell 31, where the valve body 11 includes a first base 111 and a second base 112, the first base 111 is disposed around the periphery of the second base 112, the thickness of the first base 111 is greater than or equal to that of the second base 112, the convex body 12 is in a ring shape, and the convex body 12 is disposed around a central axis 112a of the second base 112.
The other structures are the same as those of embodiment 1, and are not described herein again.
Example 4
As shown in fig. 9, different from embodiment 1, the explosion-proof valve provided in embodiment 4 includes a valve body 11 and a convex body 12, where the convex body 12 is formed by protruding a partial region of the valve body 11 in a direction away from the battery cell 31, where the valve body 11 includes a first base 111 and a second base 112, the first base 111 is disposed around the periphery of the second base 112, the thickness of the first base 111 is greater than or equal to that of the second base 112, the convex body 12 is in a ring shape, and the convex body 12 is disposed around a central axis 112a of the second base 112.
The other structures are the same as those of embodiment 1, and are not described herein again.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. An explosion-proof valve characterized by: the explosion-proof valve comprises a valve body (11) and a convex body (12) formed by partially protruding the valve body (11) along the thickness direction of the valve body, wherein an explosion-proof notch (13) is arranged on the outer side of the convex body (12) in a surrounding mode.
2. An explosion proof valve as defined in claim 1, wherein: the valve body (11) comprises a first base body (111) and a second base body (112), the first base body (111) is arranged on the periphery of the second base body (112) in a surrounding mode, and the thickness of the first base body (111) is larger than or equal to that of the second base body (112).
3. An explosion proof valve as defined in claim 2, wherein: the convex body (12) is in a circular shape or an oval shape and is positioned in the middle of the second base body (112), or the convex body (12) is in an annular shape and surrounds the central axis of the second base body (112).
4. An explosion proof valve as defined in claim 1, wherein: the convex body (12) comprises a connecting part (121) and a main body part (122), two ends of the main body part (122) are connected with the valve body (11) through the connecting part (121), and the connecting part (121) is arc-shaped.
5. An explosion proof valve as defined in claim 1, wherein: the height of the convex body (12) is greater than or equal to 0.1 mm.
6. An explosion proof valve as defined in claim 2, wherein: the ratio of the area formed by the enclosing of the convex bodies (12) to the area formed by the enclosing of the second base body (112) is more than or equal to 0.4.
7. An explosion proof valve as defined in claim 1, wherein: the distance between the explosion-proof score (13) and the convex body (12) is less than or equal to 1 mm.
8. An explosion proof valve as defined in claim 1, wherein: the valve body (11) is circular or oval.
9. A battery cover plate assembly, its characterized in that: comprising a cover body (21) and the explosion-proof valve (1) of any one of claims 1 to 8.
10. A power battery, characterized by: including electric core (31), be used for holding casing (32) and battery cover board subassembly (2) of electric core (31), its characterized in that: the battery cover plate assembly (2) is the battery cover plate assembly of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210312799.2A CN114937849A (en) | 2022-03-28 | 2022-03-28 | Explosion-proof valve, battery cover plate assembly and power battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210312799.2A CN114937849A (en) | 2022-03-28 | 2022-03-28 | Explosion-proof valve, battery cover plate assembly and power battery |
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| CN114937849A true CN114937849A (en) | 2022-08-23 |
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| CN202210312799.2A Pending CN114937849A (en) | 2022-03-28 | 2022-03-28 | Explosion-proof valve, battery cover plate assembly and power battery |
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| CN116557596A (en) * | 2023-07-12 | 2023-08-08 | 深圳海辰储能控制技术有限公司 | Explosion-proof valve, end cover assembly, battery and energy storage device |
| CN117199698A (en) * | 2023-09-11 | 2023-12-08 | 中创新航科技集团股份有限公司 | Batteries and battery devices |
| CN117283145A (en) * | 2023-09-26 | 2023-12-26 | 常州金品精密技术有限公司 | Manufacturing method of battery shell with explosion-proof nick, battery and electric equipment |
| CN117638394A (en) * | 2024-01-25 | 2024-03-01 | 蜂巢能源科技股份有限公司 | Single battery and battery pack |
| WO2024045456A1 (en) * | 2022-08-29 | 2024-03-07 | 欣旺达动力科技股份有限公司 | Explosion-proof valve and battery |
| WO2024082096A1 (en) * | 2022-10-17 | 2024-04-25 | 宁德时代新能源科技股份有限公司 | Battery cell, battery, energy storage apparatus, and electrical apparatus |
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Country or region after: China Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Applicant after: Jiangsu Zhengli New Energy Battery Technology Co.,Ltd. Address before: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Applicant before: Jiangsu Zenergy Battery Technologies Co.,ltd Country or region before: China |