CN218300123U - Explosion-proof valve and battery - Google Patents
Explosion-proof valve and battery Download PDFInfo
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- CN218300123U CN218300123U CN202222289495.7U CN202222289495U CN218300123U CN 218300123 U CN218300123 U CN 218300123U CN 202222289495 U CN202222289495 U CN 202222289495U CN 218300123 U CN218300123 U CN 218300123U
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- 230000003139 buffering effect Effects 0.000 claims abstract description 27
- 238000009434 installation Methods 0.000 claims description 14
- 238000004880 explosion Methods 0.000 claims description 6
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- 238000002360 preparation method Methods 0.000 abstract description 6
- 230000001737 promoting effect Effects 0.000 abstract description 5
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- 230000002159 abnormal effect Effects 0.000 description 2
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- 230000002093 peripheral effect Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
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- 239000003792 electrolyte Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- 210000000635 valve cell Anatomy 0.000 description 1
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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
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- 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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Abstract
The application discloses explosion-proof valve and battery belongs to battery technical field. The explosion-proof valve comprises a mounting part and a main body part, wherein the mounting part is arranged around the main body part, and the main body part is provided with nicks; the main body part comprises a first buffer part and a first connecting part, and the first buffer part is raised relative to the first connecting part; the first connecting portion is connected with the mounting portion, the first buffering portion is connected with the first connecting portion, and the first buffering portion is located on one side, away from the mounting portion, of the first connecting portion. The utility model provides a first buffering portion is protruding for first connecting portion, first buffering portion is the structure that can take place flexile deformation, receive when explosion-proof valve receives the external factor influence that makes the nick produce stress concentration easily in preparation process or applied scene, first buffering portion can produce flexile deformation and provide the flexible deformation volume, play the cushioning effect to the nick, thereby avoid nick stress concentration, explosion-proof valve's application reliability has been guaranteed, make it can not take place quick fatigue, realize promoting battery life's purpose.
Description
Technical Field
The application belongs to the technical field of batteries, and particularly relates to an explosion-proof valve and a battery.
Background
The explosion-proof valve is used as a key functional part in the battery, can play a better explosion-proof effect, and can ensure the safety of the electric vehicle using the power battery as an energy source. In the preparation process of the battery, a plurality of processes can generate certain negative effects on the explosion-proof valve. For example, ultrasonic welding of a pin and a bare cell, XY-direction extrusion when a top cover is inserted into a case, laser welding of the top cover and the case, alternate application of positive and negative pressure during liquid injection, and high-temperature baking are all prone to stress concentration in the weak explosion area of the explosion-proof valve. In addition, when the battery is subjected to internal pressure such as vibration, impact, internal gassing, etc., and applied to the explosion-proof valve, stress concentration is also easily formed at the explosion-weakened region of the explosion-proof valve. The stress generated can affect the long-term reliability of the explosion-proof valve, even cause the explosion-proof valve to be quickly fatigued, and reduce the service life of the explosion-proof valve.
Disclosure of Invention
The purpose of the invention is as follows: the application provides an explosion-proof valve, which aims to solve the problem of stress concentration formed in the explosion weak area of the explosion-proof valve in the prior art; it is another object of the present application to provide a battery comprising the above explosion-proof valve.
The technical scheme is as follows: the application provides an explosion-proof valve includes:
an installation part;
a body portion around which the mounting portion is disposed; providing a score on the body portion;
the main body part comprises a first buffering part and a first connecting part, the first buffering part is connected with the first connecting part, the first connecting part is connected with the installation part, the first buffering part is located the first connecting part is far away from one side of the installation part, the first buffering part is opposite to the first connecting part, and notches are arranged on the first connecting part.
In some embodiments, the first cushioning portion includes a first section and a second section, the first section and the second section being connected, the second section being connected with the first connection; the first section is located on one side, far away from the first connecting part, of the second section and is parallel to the first connecting part.
In some embodiments, the first section and the second section are arranged, so that the first buffer part is a structure which can be flexibly deformed and provides a certain flexible deformation amount for the explosion-proof valve; the shape of the first buffer portion is not limited to the connection shape of the first stage and the second stage, and may be a continuous arc structure or a structure in which a plurality of stages of projections are formed.
In some embodiments, in order to make the first cushioning portion more susceptible to flexible deformation, the thickness of the first section has a value D 1 The thickness of the second section increases in a direction extending toward the first connection portion, and the minimum value of the thickness of the second section is D 2min The maximum value of the thickness of the second section is D 2max Satisfies the following conditions:
0.1mm≤D 2min -D 1 ≤0.2mm；0.3mm≤D 2max -D 1 ≤0.5mm。
in some embodiments, the thickness value of the first section is D 1 The thickness of the second section having a value D 2 The thickness value of the first connecting part is D 3 When D is present 1 ≥D 2 When is in contact with D 1 Said D is 2 And said D 3 Further satisfies the following conditions:
0.5≤(H 1 +D 3 )/(D 1 +D 3 ) D is less than or equal to 2.5 mm and less than or equal to 0mm 3 -D 1 Less than or equal to 0.5mm; and/or
0.1≤(H 1 +D 3 )/tan(180-a)≤1.8；
In the formula, H 1 Represents the height of the first buffer portion (112) protruding relative to the first connection portion (111); a represents an angle formed between the first section (1121) and the second section (1122), and 120 DEG ≦ a ≦ 175 deg.
In some embodiments, the first segment and the second segment are connected by a circular arc transition. The radius of the circular arc in the circular arc transition connection is 0.1-2 mm, preferably 0.2-1 mm, and the local concentrated stress can be further reduced.
In some embodiments, at least one set of convex hulls is disposed on the first segment, the convex hulls being convex relative to the first segment; the convex hull is convex in the same direction or opposite direction to the first buffer part.
In some embodiments, the first section is further provided with a convex hull structure, and the formed convex hull can also generate flexible deformation, so that multiple buffering effects are generated, and the application reliability of the explosion-proof valve is further ensured.
In some embodiments, the convex hull includes a third segment and a fourth segment, the third segment is connected with the fourth segment, the fourth segment is connected with the first segment, and the third segment is located on a side of the fourth segment away from the first segment and is parallel to the first segment.
In some embodiments, the score is disposed on the first connection portion, at least a portion of the score being disposed around the first cushioning portion; or
The score is disposed on the first buffer.
In some embodiments, the notch is located between the first buffer part and the mounting part, and the notch is a position on the explosion-proof valve where the explosion pressure value is the minimum and is used for opening the explosion-proof valve; the first buffer part can uniformly disperse internal pressure, buffer the nicks, reduce stress concentration easily formed at the nicks and avoid abnormal failure caused by factors such as fatigue and the like.
In some embodiments, the score may be continuously or discontinuously disposed. The continuous arrangement means that the nick forms complete round structure around first buffer portion, and the discontinuous arrangement means that the nick is cut off when surrounding first buffer portion, cuts off the intensity that can improve the nick that sets up, and the concrete mode of setting up of nick uses actual demand as the standard.
In some embodiments, in order to further provide better cushioning to the nick, the main body portion includes a second cushioning portion, the first connecting portion is connected to the second cushioning portion, and the second cushioning portion is connected to the mounting portion; the first connecting part is positioned on one side of the second buffering part far away from the mounting part; the second buffer part is raised relative to the first connecting part, and the raised direction of the second buffer part is the same as or opposite to the raised direction of the first buffer part.
In some embodiments, the present application further provides a battery comprising:
an explosion-proof valve; and
a cap assembly, the cap assembly comprising: the top cover, explosion-proof hole has been seted up to the top cover, explosion-proof valve with the top cover is connected and the capping explosion-proof hole.
Has the beneficial effects that: compared with the prior art, the explosion-proof valve has the advantages that the installation part is arranged; the mounting part is arranged around the main body part; providing a score on the main body portion; the main body part comprises a first buffering part and a first connecting part, and the first buffering part is raised relative to the first connecting part; the first connecting portion is connected with the mounting portion, the first buffering portion is connected with the first connecting portion, and the first connecting portion is provided with a notch. The utility model provides a first buffer is protruding for first connecting portion, so that first buffer is the convex closure structure that can take place the flexonics, receive in the preparation process or when using the external factor influence that makes the nick produce stress concentration easily when explosion-proof valve, first buffer can produce the flexonics, provide certain flexible deformation volume, play the cushioning effect to the nick, thereby the nick stress of avoiding explosion-proof valve is too big, in order to weaken the influence that explosion-proof valve received, guarantee explosion-proof valve's application reliability, make it can not take place quick fatigue, realize promoting explosion-proof valve life's purpose.
This application still includes the second buffer portion that is located between installation department and the first connecting portion, and the second buffer portion is connected with the installation department, and the second buffer portion is for following the bellied structure of main part thickness direction, and the bellied direction of second buffer portion is the same with the bellied direction of first buffer portion or is different. This application is through addding the second buffering portion between nick and installation department, can make second buffering portion and first buffering portion produce the flexible deformation when explosion-proof valve receives the external factor influence that makes the nick produce stress concentration easily jointly, provides certain flexible deformation volume. Flexible deformation can take place for second buffering portion and first buffering portion homoenergetic, can play better cushioning effect to the nick to avoid explosion-proof valve's nick stress too big, guarantee explosion-proof valve's application reliability, realize promoting explosion-proof valve life's purpose.
The first buffer part of the application is composed of at least one group of convex hulls protruding along the thickness direction of the first section, and the protruding direction of the convex hulls is the same as or different from the protruding direction of the first buffer part. The multiple buffering structures are formed in the area formed by the nicks in a surrounding mode by arranging at least one group of convex hull structures in the area formed by the first buffering portion in a surrounding mode. When the explosion-proof valve receives the external factor influence that makes the nick produce stress concentration easily, multiunit convex closure structure homoenergetic produces flexible deformation, provides certain flexible deformation volume, can play better cushioning effect to the nick to avoid the nick stress of explosion-proof valve too big, guarantee the application reliability of explosion-proof valve, realize promoting explosion-proof valve life's purpose.
It can be understood that, compared with the prior art, the battery provided in the embodiment of the present application may have all the technical features and advantages of the above-mentioned explosion-proof valve, and will not be described herein again.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of an explosion-proof valve provided in an embodiment of the present application;
FIG. 2 isbase:Sub>A schematic cross-sectional view taken along the line A-A in FIG. 1;
FIG. 3 is an enlarged partial view of FIG. 2 at G;
fig. 4 is a schematic structural diagram of an explosion-proof valve provided in the second embodiment of the present application;
FIG. 5 is a schematic cross-sectional view taken along line C-C of FIG. 4;
FIG. 6 is a schematic structural diagram of an explosion-proof valve provided in the third embodiment of the present application;
FIG. 7 is a schematic cross-sectional view taken along the direction D-D in FIG. 6;
FIG. 8 is a schematic structural diagram of an explosion-proof valve provided in the fourth embodiment of the present application;
FIG. 9 is a schematic cross-sectional view taken along line E-E of FIG. 8;
fig. 10 is an exploded view of a cap assembly provided in accordance with an embodiment of the present application;
fig. 11 is a schematic diagram of a battery structure provided in an embodiment of the present application;
FIG. 12 is a schematic diagram illustrating the cell attenuation of the explosion-proof valve provided in the first embodiment of the present application at 130 ℃ compared with that of a conventional explosion-proof valve;
FIG. 13 is a schematic structural view of a conventional explosion-proof valve provided in accordance with an embodiment of the present application;
the reference numeral, 1-explosion-proof valve, 2-top cover assembly, 3-battery, 10-installation part, 11-main body part, 21-top cover, 22-protection film, 23-positive pole, 24-negative pole, 31-shell, 111-first connection part, 112-first buffer part, 113-second buffer part, 211-explosion-proof hole, 1111-nick, 1121-first section, 1122-second section, 1123-convex hull, 11231-third section, and 11232-fourth section.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application.
Example one
Referring to the explosion-proof valve 1 shown in fig. 1, the explosion-proof valve comprises a mounting portion 10 and a main body portion 11, wherein the mounting portion 10 is arranged around the main body portion 11; the main body 11 includes a first buffer portion 112 and a first connection portion 111, the first buffer portion 112 is connected to the first connection portion 111, the first connection portion 111 is connected to the mounting portion 10, the first buffer portion 112 is located on a side of the first connection portion 111 away from the mounting portion 10, the first buffer portion 112 is protruded relative to the first connection portion 111, and a notch 1111 is formed on the first connection portion 111.
In the explosion-proof valve 1 according to the first embodiment, since the notch 1111 is disposed on the first connection portion 111, the notch 1111 is located between the mounting portion 10 and the first buffer portion 112, that is, the first buffer portion 112 is located in the area surrounded by the notch 1111, and the first buffer portion 112 is a convex structure that can be flexibly deformed. Because the mounting part 10 is located at the peripheral edge of the explosion-proof valve 1 and the thickness of the mounting part is larger, even if the explosion-proof valve 1 is under the action of larger atmospheric pressure or the inside air pressure of the explosion-proof valve 1 fluctuates, the stability between the nicks 1111 and the mounting part 10 is higher than the stability in the area surrounded by the nicks 1111, so that the area surrounded by the nicks 1111 can be better protected by the first buffer part 112 in the area surrounded by the nicks 1111, and the area surrounded by the nicks 1111 is also the central area of the explosion-proof valve 1, so that the arrangement of the first buffer part 112 can particularly reduce the deformation of the outer surface or the inner surface of the middle area of the explosion-proof valve 1 in the thickness direction, thereby better improving the stability of the opening threshold value of the whole explosion-proof valve 1. If first buffer 112 is not provided in the region that nick 1111 encloses, perhaps nick 1111 does not set up between installation department 10 and first buffer 112, because the central zone of explosion-proof valve 1 lacks the first buffer 112 that can provide flexible deformation for explosion-proof valve 1 leads to the stress of nick 1111 department too big when receiving external factors influence easily, thereby further causes explosion-proof valve 1 fast fatigue, the problem of life-span reduction.
Referring further to fig. 2, a mounting portion 10 is disposed on the outer peripheral edge of the main body portion 11, and the mounting portion 10 is used for sealing and connecting the explosion-proof valve 1 to the top cover assembly; notch 1111 surrounds first buffer portion 112, and notch 1111 is the position that the burst pressure value is minimum on explosion-proof valve 1, and notch 1111 is used for opening explosion-proof valve 1 when the internal space atmospheric pressure of cap assembly reaches the opening threshold of explosion-proof valve 1, releases the gas in the internal space of cap assembly to prevent the explosion from taking place. The overall outer contour of the explosion-proof valve 1 is in a runway shape, and the notch 1111 is also set to be in a shape similar to the runway shape, so that the notch 1111 can more easily open the explosion-proof valve 1 when the air pressure in the inner space reaches the opening threshold of the explosion-proof valve 1; score 1111 of fig. 1 is at least partially disposed around first buffer portion 112, i.e. a section of area separating score 1111 is left in first connection portion 111 to avoid the structural strength of score 1111 from being too low.
In some embodiments, the first cushioning portion 112 is a structure that can be flexibly deformed, the first cushioning portion 112 includes a first segment 1121 and a second segment 1122, the first segment 1121 and the second segment 1122 are connected, the second segment 1122 is connected to the first connection portion 111, the first segment 1121 is located on a side of the second segment 1122 away from the first connection portion 111, and the first segment 1121 is parallel to the first connection portion 111; the direction in which the first cushioning portion 112 protrudes relative to the first connecting portion 111 is in the thickness direction of the explosion-proof valve 1, and protrudes toward the front of the explosion-proof valve 1, because the protruding direction of the first cushioning portion 112 does not affect its ability to flexibly deform, the first cushioning portion 112 may also be provided to protrude toward the back of the explosion-proof valve 1. The first segment 1121 and the second segment 1122 may be integrally formed on the body 11 by pressing, or may be formed by other processing methods that can be easily realized.
In some embodiments, the parallelism of the first segment 1121 and the first connection portion 111 refers to being completely parallel or nearly completely parallel, for example, all counted as being parallel within an angle of 10 ° of being completely parallel.
In some embodiments, when the explosion-proof valve 1 is subjected to extrusion, thermal deformation or internal air pressure, the first buffer portion 112 can provide a certain flexible deformation amount to avoid the score 1111 from being overstressed, so that the service life of the explosion-proof valve 1 can be prolonged; when the explosion-proof valve 1 is subjected to vibration, impact or abnormal falling, the first buffer part 112 can provide certain flexible buffer, so that the influence on the explosion-proof valve 1 is weakened, and the application reliability of the explosion-proof valve 1 is ensured.
In some embodiments, please further refer to fig. 3, the thickness of the first segment 1121 is set to a first thickness D 1 The thickness of the second segment 1122 is the second thickness D 2 The thickness of the first connecting portion 111 is a third thickness D 3 The thicknesses of the first and second segments 1121, 1122 can have the following magnitude relationship:
first, D 1 ＜D 2 And a first thickness D 1 Constant, the second thickness D in the direction extending toward the first connection portion 111 2 Increasing, at which time the thickness of the first segment 1121 is designed to be the minimum thickness; the second segment 1122 has a minimum thickness of D 2min The thickness of the second segment 1122 has a maximum value of D 2max And satisfies the following conditions:
0.1mm≤D 2min -D 1 ≤0.2mm；0.3mm≤D 2max -D 1 ≤0.5mm；
or of the second type, D 1 ≥D 2 And a first thickness D 1 The second thickness D is unchanged.
In some embodiments, constant means that the thickness remains substantially consistent, e.g., the thickness is within 0.05mm of the tolerance; increasing means either a uniform or non-uniform increase in thickness, as long as the tendency to keep the thickness increasing in the direction of extension is met.
In some embodiments, when D 1 ≥D 2 And a first thickness D 1 Remaining unchanged and having a second thickness D 2 The first thickness D is kept constant 1 And a third thickness D 3 Further satisfies the following conditions:
0.5≤(H 1 +D 3 )/(D 1 +D 3 ) Less than or equal to 2.5 mm and less than or equal to 0mm D 3 -D 1 Less than or equal to 0.5mm; and/or
0.1≤(H 1 +D 3 )/tan(180-a)≤1.8；
In the formula, H 1 Represents the height of the first buffer portion 112 protruding with respect to the first connection portion 111; a represents an angle formed between the first segment 1121 and the second segment 1122, and a is 120 DEG-175 deg.
In some embodiments, the first thickness D 1 And a third thickness D 3 Further satisfies the following conditions:
1.0≤(H 1 +D 3 )/(D 1 +D 3 ) Less than or equal to 1.6, and less than or equal to 0mm D 3 -D 1 Less than or equal to 0.2mm; and/or
0.2≤(H 1 +D 3 )/tan(180-a)≤0.9。
In some embodiments, the included angle a may be a range composed of any one or two of 120 °, 125 °, 130 °, 135 °, 140 °, 145 °, 150 °, 155 °, 160 °, 165 °, 170 °, and 175 °, and the included angle a is limited in this range, so that the first buffer portion 112 can better meet the flexible buffer requirement of the explosion-proof valve 1.
In some embodiments, the thickness of the second segment 1122 is not greater than that of the first connection portion 111, so that the first buffer portion 112 is more easily flexibly deformed when the explosion-proof valve 1 is affected by an external factor which easily causes stress concentration to the notch 1111.
In some embodiments, when D 1 ＜D 2 And the first thickness D 1 The second thickness D is constant along the direction extending towards the first connection part (111) 2 When increased, the first thickness D 1 And the second thickness D 2 Further satisfies the following conditions:
0.1mm≤D 2 -D 1 ≤0.5mm。
in some embodiments, D 2 -D 1 The range of (b) may be any one of 0.1mm, 0.2mm, 0.3mm, 0.4mm and 0.5 mm.
In some embodiments, the first segment 1121 and the second segment 1122 are connected by a circular arc transition, and the radius of the circular arc is 0.1-2 mm, preferably in the range of 0.2-1 mm, so as to further reduce the local concentrated force.
In some embodiments, the thickness of the notch 1111 is 0.01 to 0.3mm, the thickness of the first segment 1121 is 0.1 to 0.5mm, and the distance between the notch 1111 and the first buffer portion 112 is 0.5 to 3mm.
In some embodiments, the score 1111 of the explosion-proof valve provided in the first embodiment is disposed between the mounting portion 10 and the first buffer portion 112, and the first buffer portion 112 is a convex structure which can be flexibly deformed; when the explosion-proof valve 1 is influenced by external factors which easily cause the notch 1111 to generate stress concentration in the preparation process or application scene, the first buffering part 112 can generate flexible deformation, provide certain flexible deformation amount and play a role in buffering the notch 1111, so that the notch 1111 is prevented from having overlarge stress, the influence on the explosion-proof valve 1 is weakened, the application reliability of the explosion-proof valve 1 is ensured, the explosion-proof valve is prevented from generating rapid fatigue due to the influence, and the purpose of prolonging the service life of the explosion-proof valve 1 is realized.
Example two
Referring further to the explosion-proof valve 1 shown in fig. 4-5, the structure is similar to that of the first embodiment, except that the main body 11 further includes a second buffer portion 113 and the protruding direction of the first buffer portion 112 is opposite to that of the first embodiment. The first connecting portion 111 is connected to the second buffer portion 113, the second buffer portion 113 is connected to the mounting portion 10, and the second buffer portion 113 is protruded with respect to the first connecting portion 111. The second buffer portion 113 is located between the mounting portion 10 and the first connection portion 111, and the second buffer portion 113 protrudes in the same direction or in the opposite direction to the first buffer portion 112. In fig. 4, the first buffer portion 112 is formed in the body portion 11 so as to project toward the back surface of the explosion-proof valve 1 in the thickness direction of the explosion-proof valve 1, and the second buffer portion 113 is formed in the body portion 11 so as to project in the same direction as the first buffer portion 112.
In some embodiments, the second buffer portion 113 may be integrally formed on the main body portion 11 by stamping, or may be formed by other processing methods that are easy to implement.
In the explosion-proof valve 1 according to the second embodiment, the second buffer portion 113 is additionally provided between the mounting portion 10 and the first connection portion 111, so that the second buffer portion 113 and the first buffer portion 112 are flexibly deformed together when the explosion-proof valve 1 is affected by an external factor which tends to concentrate stress on the notch 1111, thereby providing a certain amount of flexible deformation. If first buffer portion 112 is not set up in the region that nick 1111 encloses, or nick 1111 does not set up between installation department 10 and first buffer portion 112, and do not set up second buffer portion 113 between installation department 10 and first connecting portion 111, when the part between installation department 10 and nick 1111 receives bigger impact force, can directly act on nick 1111 and lead to explosion-proof valve 1 to become invalid, consequently second buffer portion 113 and first buffer portion 112 homoenergetic take place flexible deformation, can play better cushioning effect to nick 1111, thereby avoid the nick 1111 stress of explosion-proof valve 1 too big, guarantee explosion-proof valve 1's application reliability, realize promoting explosion-proof valve life's purpose.
EXAMPLE III
Referring further to fig. 6-7, the explosion-proof valve 1 is similar to the first embodiment in structure, except that a set of convex hulls 1123 are disposed on the first section 1121, and the convex hulls 1123 are formed in the area surrounded by the first section 1121; the convex hull 1123 is convex relative to the first segment 1121; the convex hull 1123 protrudes in the same direction or in the opposite direction as the first cushioning portion 112.
In some embodiments, the convex hull 1123 includes a third segment 11231 and a fourth segment 11232, the third segment 11231 connected to the fourth segment 11232, the fourth segment 11232 connected to the first segment 1121, and the third segment 11231 parallel to the first segment 1121. The first cushioning portion 112 faces the front surface of the explosion-proof valve 1, and the convex hull 1123 faces the back surface of the explosion-proof valve 1. The convex hull 1123 may be stamped or otherwise formed on the first segment 1121.
In some embodiments, the number of convex hulls 1123 may be one or more, as long as the strength of the first buffer 112 is not affected.
In the explosion-proof valve 1 provided by the third embodiment, at least one set of convex hulls 1123 is further arranged in the region surrounded by the first section 1121, so that at least a double buffering structure is formed in the region surrounded by the notch 1111, and when the explosion-proof valve 1 is influenced by an external factor which easily causes stress concentration to occur at the notch 1111, the convex hulls 1123 and the first buffering part 112 can both generate flexible deformation to provide multiple flexible deformation amounts; if the first buffer portion 112 is not arranged in the region surrounded by the notch 1111, or the notch 1111 is not arranged between the mounting portion 10 and the first buffer portion 112, and the convex hull 1123 is not arranged on the first segment 1121, when the first segment 1121 is subjected to a larger impact force, due to the lack of the convex hull 1123 capable of providing buffer for the first segment 1121, the first segment 1121 is broken before the notch 1111, so that the explosion-proof valve 1 fails in advance, therefore, the arrangement of the convex hull 1123 can play a better buffer role for the notch 1111, the notch 1111 of the explosion-proof valve is prevented from being stressed excessively, the application reliability of the explosion-proof valve 1 is ensured, and the purpose of prolonging the service life of the explosion-proof valve 1 is achieved.
Example four
With further reference to the explosion-proof valve 1 shown in fig. 8-9, the explosion-proof valve includes a mounting portion 10 and a main body portion 11, wherein the mounting portion 10 is disposed around the main body portion 11; the main body 11 includes a first buffer portion 112 and a first connection portion 111, the first connection portion 111 is connected to the mounting portion 10, the first buffer portion 112 is connected to the first connection portion 111, and the first buffer portion 112 protrudes relative to the first connection portion 111; a notch 1111 is provided in the first buffer portion 112.
In some embodiments, the first buffering portion 112 includes a first segment 1121 and a second segment 1122, the first segment 1121 is connected to the second segment 1122, the second segment 1122 is connected to the first connecting portion 111, the first segment 1121 is parallel to the first connecting portion 111, notches 1111 are disposed on the first segment 1121 at intervals or continuously.
In the explosion-proof valve 1 according to the fourth embodiment, since the notch 1111 is disposed on the first buffer portion 112, the notch 1111 is located in an area surrounded by the first buffer portion 112, especially for a process of extruding the top cover into the housing, because the extruded area of the explosion-proof valve 1 is large, if the notch 1111 is not disposed on the first buffer portion 112 or the explosion-proof valve 1 is not disposed with the first buffer portion 112, the notch 1111 and the first buffer portion 112 have different actions under the same stress, so that stress concentration occurs at the notch 1111 due to an external force with a large area during the extrusion process, and if the notch 1111 is directly disposed on the first buffer portion 112, the notch 1111 is flexibly deformed together with the first buffer portion 112, thereby reducing a problem that the first buffer portion 112 generates a buffer that is difficult to cover the notch 1111 due to a large stressed area of the explosion-proof valve 1, and therefore, when the notch 1111 is directly disposed on the first buffer portion 112, the flexible deformation of the first buffer portion 112 under a special process can achieve a better effect of reducing the stress of the notch 1111.
In some embodiments, referring further to the cap assembly 2 of fig. 10, the cap assembly 2 includes a cap 21 and an explosion-proof valve 1, and the explosion-proof valve 1 may be any one of the first to fourth embodiments. The top cover 21 is provided with an explosion-proof hole 211 matched with the mounting part 10, and the mounting part 10 is mounted in the explosion-proof hole 211 so as to connect the explosion-proof valve 1 on the top cover 21 in a sealing way.
In some embodiments, the explosion-proof hole 211 is a stepped hole, and the mounting portion 10 is an annular boss matching the stepped hole, and the thickness of the annular boss is 0.1-2.0 mm, preferably 0.3-1.0 mm. The thickness of the annular boss within the above range can improve the stability of the strength of the mounting portion 10 with respect to the main body portion 11.
In some embodiments, the top cap assembly 2 further includes a protective film 22, the protective film 22 being attached to the outer side surface of the top cap 21 and completely covering the explosion-proof hole 211 to prevent the electrolyte or other impurities from contaminating the explosion-proof valve 1. The top cover 21 is further provided with a positive electrode tab 23 and a negative electrode tab 24 at both ends in the longitudinal direction thereof. When the cap assembly 2 is mounted at the opening of the case of the battery, the positive and negative posts 23 and 24 are used to electrically connect the positive and negative electrodes of the battery cell located inside the case, respectively.
In some embodiments, the top cover 21 is hermetically connected with the explosion-proof valve 1, so that when the top cover is affected by an external factor which easily causes stress concentration to occur in the notch 1111 in a preparation process or an application scene, the first buffer portion 112 is flexibly deformed to provide a certain flexible deformation amount, and the notch 1111 is buffered, so that the influence on the explosion-proof valve 1 is weakened, the application reliability of the explosion-proof valve 1 is ensured, rapid fatigue of the explosion-proof valve 1 due to the influence is avoided, and the purpose of prolonging the service life is achieved.
In some embodiments, referring further to the battery 3 of fig. 11, the battery 3 includes a casing 31, a cell (not shown in the drawings) enclosed by the casing 31 and including a positive plate, a negative plate and a diaphragm disposed between the positive plate and the negative plate, and a cap assembly 2 sealing the casing 31, wherein the positive post 23 and the negative post 24 mounted on the cap 21 are respectively used for electrically connecting the positive plate and the negative plate of the cell.
In some embodiments, the cell bursting values of the explosion-proof valve of the embodiment and the conventional explosion-proof valve are respectively detected in Mpa, and the test and comparison results are shown in table 1.
In some embodiments, the conventional explosion-proof valve refers to an explosion-proof valve without a first buffer portion, such as an explosion-proof valve with a C-shaped score line, and the specific structure is shown in fig. 13.
TABLE 1
As can be seen from table 1, the range of the cell rupture value of the conventional explosion-proof valve is 0.833Mpa to 0.949Mpa, the range of the cell rupture value of the explosion-proof valve of the first embodiment is 0.871Mpa to 0.954Mpa, and the standard deviation of the obtained data is further calculated, and it can be seen by comparing 32 groups of samples that the standard deviation of the cell rupture value of the explosion-proof valve of the first embodiment is 0.0193, the standard deviation of the cell rupture value of the conventional explosion-proof valve is 0.0293, and the standard deviation of the explosion-proof valve of the first embodiment is significantly lower than that of the conventional explosion-proof valve, so that the standard deviation of the explosion-proof valve of the first embodiment is smaller, which means that the cell rupture value tested by the explosion-proof valve of the first embodiment is closer to the average value, so that the consistency of the cell rupture value of the explosion-proof valve of the first embodiment is better than that of the conventional explosion-proof valve.
In some examples, the 130 degree high temperature accelerated decay test was performed on the example explosion-proof valve and the conventional explosion-proof valve, respectively, and the test results after 12 weeks are shown in fig. 12. As can be seen from fig. 12, after 12 weeks of the high-temperature accelerated test, the average attenuation of the explosion-proof valve of the embodiment is about 0.1, while the average attenuation of the conventional explosion-proof valve cell is about 0.25, which illustrates that the explosion-proof valve of the embodiment can significantly reduce the attenuation and improve the service life.
The utility model provides an explosion-proof valve 1 can make first buffer portion 112 produce the flexible deformation in preparation process or applied scene, thereby first buffer portion 112 provides certain flexible deformation volume and plays the cushioning effect to nick 1111, to different processing procedures, the problem of nick 1111 influences the uniformity of explosion-proof valve blasting value and the rapid decay in the use because of stress concentration can all be solved, the stress concentration who forms in nick 1111 department has been reduced, guarantee explosion-proof valve 1's application reliability, make explosion-proof valve 1 can not take place quick fatigue because of external influence, promote explosion-proof valve 1's life, also make the battery life and the application reliability that contain above-mentioned explosion-proof valve 1 obtain improving simultaneously.
The explosion-proof valve and the battery provided by the embodiment of the application are introduced in detail, a specific example is applied in the application to explain the principle and the implementation mode of the application, and the description of the embodiment is only used for helping to understand the technical scheme and the core idea of the application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. An explosion-proof valve, comprising:
a mounting portion (10);
a main body portion (11), the mounting portion (10) being disposed around the main body portion (11); providing a score (1111) on the main body portion (11);
wherein, main part (11) includes first buffer portion (112) and first connecting portion (111), first buffer portion (112) with first connecting portion (111) are connected, first connecting portion (111) with installation department (10) are connected, first buffer portion (112) are located first connecting portion (111) are kept away from one side of installation department (10), first buffer portion (112) for first connecting portion (111) are protruding set up nick (1111) on first connecting portion (111).
2. The explosion vent valve according to claim 1, wherein the first buffer portion (112) includes a first segment (1121) and a second segment (1122), the first segment (1121) and the second segment (1122) being connected, the second segment (1122) being connected to the first connecting portion (111); the first section (1121) is positioned on one side of the second section (1122) far away from the first connecting part (111) and is parallel to the first connecting part (111).
3. Explosion-proof valve according to claim 2, characterized in that the thickness value of the first section (1121) is D 1 A thickness of the second segment (1122) increases in a direction extending toward the first connection portion (111), and a minimum value of the thickness of the second segment (1122) is D 2min A maximum thickness of the second segment (1122) is D 2max And satisfies the following conditions:
0.1mm≤D 2min -D 1 ≤0.2mm；0.3mm≤D 2max -D 1 ≤0.5mm。
4. explosion-proof valve according to claim 2, characterized in that the thickness value of the first section (1121) is D 1 The thickness value of the second section (1122) is D 2 The thickness value of the first connecting part (111) is D 3 When D is present 1 ≥D 2 When is in contact with D 1 D is said to 2 And said D 3 Further satisfies the following conditions:
0.5≤(H 1 +D 3 )/(D 1 +D 3 ) D is less than or equal to 2.5 mm and less than or equal to 0mm 3 -D 1 Less than or equal to 0.5mm; and/or
0.1≤(H 1 +D 3 )/tan(180-a)≤1.8；
In the formula, H 1 Represents the height of the first buffer portion (112) protruding relative to the first connection portion (111); a represents an angle formed between the first section (1121) and the second section (1122), and 120 DEG ≦ a ≦ 175 deg.
5. Explosion-proof valve according to claim 2, characterized in that the first section (1121) and the second section (1122) are connected by a circular arc transition.
6. Explosion-proof valve according to claim 2, characterized in that at least one set of convex hulls (1123) is provided on the first section (1121), the convex hulls (1123) being raised with respect to the first section (1121); the convex hull (1123) protrudes in the same direction or in the opposite direction to the first cushioning portion (112).
7. Explosion-proof valve according to claim 6, characterized in that the convex hull (1123) comprises a third section (11231) and a fourth section (11232), the third section (11231) being connected to the fourth section (11232), the fourth section (11232) being connected to the first section (1121); the third section (11231) is positioned on the side of the fourth section (11232) far away from the first section (1121), and the third section (11231) is parallel to the first section (1121).
8. An explosion-proof valve as claimed in claim 1, characterized in that the score (1111) is provided on the first connection portion (111), at least part of the score (1111) being provided around the first buffer portion (112); or
The score (1111) is provided on the first buffer portion (112).
9. The explosion vent valve according to claim 1, wherein the main body portion (11) includes a second cushioning portion (113), the first connecting portion (111) is connected to the second cushioning portion (113), and the second cushioning portion (113) is connected to the mounting portion (10); the first connecting part (111) is positioned on one side of the second buffering part (113) far away from the mounting part (10); the second buffer part (113) protrudes relative to the first connection part (111), and the protruding direction of the second buffer part (113) is the same as or opposite to the protruding direction of the first buffer part (112).
10. A battery, comprising:
an explosion-proof valve (1) as defined in any one of claims 1 to 9; and
the explosion-proof valve comprises a top cover assembly (2), wherein the top cover assembly (2) comprises a top cover (21), an explosion-proof hole (211) is formed in the top cover (21), and the explosion-proof valve (1) is connected with the top cover (21) and covers the explosion-proof hole (211).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222289495.7U CN218300123U (en) | 2022-08-29 | 2022-08-29 | Explosion-proof valve and battery |
| PCT/CN2022/143655 WO2024045456A1 (en) | 2022-08-29 | 2022-12-29 | Explosion-proof valve and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222289495.7U CN218300123U (en) | 2022-08-29 | 2022-08-29 | Explosion-proof valve and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218300123U true CN218300123U (en) | 2023-01-13 |
Family
ID=84811729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222289495.7U Active CN218300123U (en) | 2022-08-29 | 2022-08-29 | Explosion-proof valve and battery |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN218300123U (en) |
| WO (1) | WO2024045456A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116771964A (en) * | 2023-08-28 | 2023-09-19 | 深圳海辰储能控制技术有限公司 | Explosion-proof valve, end cover assembly, energy storage device 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 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208955080U (en) * | 2018-10-18 | 2019-06-07 | 江苏天钧精密技术有限公司 | A kind of battery cover board explosion rupture disk |
| CN212161868U (en) * | 2020-04-20 | 2020-12-15 | 欣旺达电动汽车电池有限公司 | Battery top cap subassembly and battery cell |
| CN217158533U (en) * | 2021-09-30 | 2022-08-09 | 欣旺达电动汽车电池有限公司 | Explosion-proof valve, top cap subassembly and battery |
| CN114937849A (en) * | 2022-03-28 | 2022-08-23 | 江苏正力新能电池技术有限公司 | Explosion-proof valve, battery cover plate assembly and power battery |
-
2022
- 2022-08-29 CN CN202222289495.7U patent/CN218300123U/en active Active
- 2022-12-29 WO PCT/CN2022/143655 patent/WO2024045456A1/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116771964A (en) * | 2023-08-28 | 2023-09-19 | 深圳海辰储能控制技术有限公司 | Explosion-proof valve, end cover assembly, energy storage device and electric equipment |
| CN116771964B (en) * | 2023-08-28 | 2024-01-12 | 深圳海辰储能控制技术有限公司 | Explosion-proof valve, end cover assembly, energy storage device 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 |
| CN117638394B (en) * | 2024-01-25 | 2024-04-12 | 蜂巢能源科技股份有限公司 | Single battery and battery pack |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024045456A1 (en) | 2024-03-07 |
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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518107 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |