CN213752947U - Battery explosion-proof device and lithium ion battery - Google Patents
Battery explosion-proof device and lithium ion battery Download PDFInfo
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- CN213752947U CN213752947U CN202022519738.2U CN202022519738U CN213752947U CN 213752947 U CN213752947 U CN 213752947U CN 202022519738 U CN202022519738 U CN 202022519738U CN 213752947 U CN213752947 U CN 213752947U
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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 utility model belongs to the technical field of battery production and manufacture, in particular to a battery explosion-proof device and a lithium ion battery, which comprises an explosion-proof sheet (1) and an elastic sealing element (2) arranged below the explosion-proof sheet (1), wherein the explosion-proof sheet (1) is provided with a plurality of exhaust holes (11), one of the exhaust holes (11) is arranged in the center of the explosion-proof sheet (1), the rest of the exhaust holes (11) are uniformly arranged on the explosion-proof sheet (1) by taking the exhaust holes (11) as the center, the top surface of the explosion-proof sheet (1) is provided with a protective film (3), the protective film (3) covers a plurality of exhaust holes (11), the sealing element (2) is provided with a plurality of sharp thorn parts (21), the sharp thorn parts (21) correspond to the exhaust holes (11), and a fixing ring (4) is arranged between the explosion-proof sheet (1) and the sealing element (2). The utility model discloses can improve the stability of exhaust pressure in the battery.
Description
Technical Field
The utility model belongs to the technical field of battery production manufacturing, concretely relates to battery explosion-proof equipment and lithium ion battery.
Background
Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like. In order to improve the safety of the power battery and prevent the power battery from exploding due to excessive internal pressure, an explosion-proof hole is generally formed in a battery cover plate, and an explosion-proof valve is installed in the explosion-proof hole. The traditional explosion-proof device is generally realized by adopting a burst type exhaust structure, and the explosion-proof sheet is broken at an explosion-proof trace through the continuous increase of the air pressure in the battery body, so that the gas is exhausted.
In the existing battery explosion-proof technology, the fracture pressure of an explosion-proof sheet is difficult to control accurately, so that the pressure which can be borne by an explosion-proof device is different, and the exhaust pressure difference of batteries is large.
SUMMERY OF THE UTILITY MODEL
One of the purposes of the utility model lies in: aiming at the defects of the prior art, the battery explosion-proof device is provided, and the stability of the exhaust pressure in the battery can be improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a battery explosion-proof equipment, is in including explosion-proof piece and setting the elastic sealing member of explosion-proof piece below, explosion-proof piece is provided with a plurality of exhaust hole, one of them the exhaust hole sets up the center of explosion-proof piece, all the other the exhaust hole uses this exhaust hole to evenly set up as the center explosion-proof piece, the top surface of explosion-proof piece is provided with the protection film, the protection film covers a plurality of the exhaust hole, the sealing member is provided with a plurality of spine portion, spine portion with the exhaust hole corresponds, explosion-proof piece with be provided with the retainer plate between the sealing member.
Preferably, the height of the spike part located at the center of the sealing member is greater than the height of the remaining spike parts.
Preferably, the edges of the explosion-proof sheet and the sealing element are both provided with a concave part, and the inner side of the fixing ring is provided with a convex part matched with the concave part.
Preferably, the explosion-proof sheet is provided with a score around the axis thereof, and a part of the spine portion abuts against the score.
Preferably, the cross section of the score is concave.
Preferably, the top of the spine part is conical.
Preferably, the explosion-proof plate is arranged in parallel with the sealing element.
Preferably, the thickness of the explosion-proof sheet is 0.3mm-0.4 mm.
A second object of the present invention is to provide a lithium ion battery, including the above battery explosion-proof device.
The beneficial effects of the utility model reside in that, the utility model discloses an explosion-proof piece and setting are in the elastic sealing member of explosion-proof piece below, explosion-proof piece is provided with a plurality of exhaust hole, one of them the exhaust hole sets up the center of explosion-proof piece, all the other the exhaust hole uses this exhaust hole evenly to set up as the center explosion-proof piece, explosion-proof piece's top surface is provided with the protection film, the protection film covers a plurality of the exhaust hole, the sealing member is provided with a plurality of spine portion, spine portion with the exhaust hole corresponds, explosion-proof piece with be provided with the retainer plate between the sealing member. Because the traditional explosion-proof device is generally realized by adopting a support-type exhaust structure, the explosion-proof sheet is broken at an explosion-proof mark through the continuous increase of the air pressure in a battery body, so that the gas is exhausted, the breaking pressure of the explosion-proof sheet is difficult to accurately control, so that the pressure which can be borne by the explosion-proof device is different, and the difference of the exhaust pressure of the battery is larger, therefore, the elastic sealing element is pushed by the pressure in the battery to be protruded outwards to form a cambered surface, so that the sharp part moves towards the exhaust hole, the sharp part at the center of the sealing element firstly pierces the protective film of the exhaust hole at the center of the explosion-proof sheet, if the pressure in the battery is increased, the rest sharp parts pierce the protective film of the exhaust hole at the periphery of the exhaust hole at the center until the sharp parts pierce the protective films of all the exhaust holes, namely, the number of the protective films of the exhaust holes is controlled according to the pressure in the battery, therefore, gas can be rapidly discharged from the exhaust holes, the gas pressure in the battery body is accumulated to a certain value and is in direct proportion to the number of the opened exhaust holes, and the stability of the exhaust pressure in the battery body is effectively improved. The utility model discloses can improve the stability of exhaust pressure in the battery.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic diagram of the operation of the first embodiment of the present invention.
Fig. 3 is a schematic diagram of the operation of the second embodiment of the present invention.
Wherein the reference numerals are as follows:
1-explosion-proof piece; 11-an exhaust hole;
2-a seal; 21-spine part;
3-protective film;
4-a fixed ring;
and 5-scoring.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to fig. 1 to 3, but the present invention is not limited thereto.
Implementation mode one
The utility model provides a battery explosion-proof equipment, including explosion-proof piece 1 and the elastic sealing member 2 of setting in explosion-proof piece 1 below, explosion-proof piece 1 is provided with a plurality of exhaust hole 11, one of them exhaust hole 11 sets up the center at explosion-proof piece 1, remaining exhaust hole 11 uses this exhaust hole 11 evenly to set up at explosion-proof piece 1 as the center, the top surface of explosion-proof piece 1 is provided with protection film 3, protection film 3 covers a plurality of exhaust hole 11, sealing member 2 is provided with a plurality of spine portion 21, spine portion 21 corresponds with exhaust hole 11, be provided with retainer plate 4 between explosion-proof piece 1 and the sealing member 2.
Because the traditional explosion-proof device is generally realized by adopting a support-type exhaust structure, the explosion-proof sheet is broken at an explosion-proof mark through the continuous increase of the air pressure in the battery body, so that the gas is exhausted, the breaking pressure of the explosion-proof sheet is difficult to accurately control, so that the pressure which can be borne by the explosion-proof device is different, and the difference of the exhaust pressure of the battery is larger, therefore, the elastic sealing member 2 is pushed by the pressure in the battery to be protruded outwards to form a cambered surface, so that the sharp part 21 moves towards the exhaust hole 11, the sharp part 21 at the center of the sealing member 2 firstly pierces the protective film 3 of the exhaust hole 11 at the center of the explosion-proof sheet 1, if the pressure in the battery is increased, the rest of the sharp parts 21 will pierce the protective film 3 of the exhaust hole 11 at the periphery of the exhaust hole 11 at the center until the sharp parts 21 pierce the protective films 3 of all the exhaust holes 11, namely, according to the pressure in the battery, the quantity of the punctured protective films 3 of the exhaust holes 11 is controlled, so that gas can be rapidly exhausted from the exhaust holes 11, the gas pressure in the battery body is accumulated to a certain value and is in direct proportion to the quantity of the opened exhaust holes 11, and the stability of the exhaust pressure in the battery body is effectively improved, wherein the protective films 3 cover the exhaust holes 11, after the exhaust is completed, the battery explosion-proof device can be repeatedly used only by replacing the protective films 3, the requirement on the processing precision of the explosion-proof device is greatly reduced, the deformation quantity of the pressed sealing element 2 is relatively fixed, the pressure stability of the explosion-proof device triggered by the gas pressure in the battery body can be ensured, and the condition of the difference of the exhaust pressure in the battery body is reduced.
In the basis the utility model discloses an among the battery explosion-proof equipment, the height that highly is greater than all the other spine portion 21 of spine portion 21 that is located sealing member 2 center for spine portion 21 that is located sealing member 2 center at first pierces through the protection film 3 at the exhaust hole 11 at explosion-proof piece 1's center, help improving the efficiency of explosion-proof equipment pressure release, guaranteed sealing member 2 behind the same inflation displacement, spine portion 21 can pierce through protection film 3 on the exhaust hole 11 at explosion-proof piece 1's center, realize the pressure release, avoid the too big explosion that takes place in the battery.
In the battery explosion-proof apparatus according to the present invention, the top of the spine portion 21 is tapered. The top of the spike 21 may be tapered according to the strength of the protective film 3, so that the top of the spike 21 may pierce the protective film 3.
According to the utility model discloses an among the battery explosion-proof equipment, explosion-proof piece 1 and sealing member 2 parallel arrangement form the space that sealing member 2 takes place deformation between explosion-proof piece 1 and sealing member 2 for spine portion 21 on the sealing member 2 can contact explosion-proof piece 1.
In the battery explosion-proof device according to the utility model discloses, the thickness of explosion-proof piece 1 is 0.3 mm. The thickness of the explosion-proof piece 1 is limited to be the minimum value, and the mechanical strength of the explosion-proof piece 1 is reduced due to the fact that the thickness of the explosion-proof piece 1 is too small, and the service life of the explosion-proof device is not prolonged favorably.
The utility model discloses a theory of operation is:
the elastic sealing element 2 is pushed by the pressure in the battery to protrude outwards to form a cambered surface, so that the spine part 21 moves towards the direction of the vent hole 11, the spine part 21 in the center of the sealing element 2 firstly pierces the protective film 3 of the vent hole 11 in the center of the explosion-proof sheet 1, if the pressure in the battery increases, the rest spine parts 21 will pierce the protective film 3 of the vent hole 11 at the periphery of the vent hole 11 in the center until the spine part 21 pierces the protective films 3 of all the vent holes 11, namely, the pierced number of the protective films 3 of the vent holes 11 is controlled according to the pressure in the battery, thereby ensuring that gas can be rapidly discharged from the vent holes 11, realizing that the pressure in the battery is accumulated to a certain value, being in direct proportion to the number of the vent holes 11 which are opened, and effectively improving the stability of the pressure in the battery.
Second embodiment
The difference from the first embodiment is that: the explosion-proof sheet 1 of the present embodiment is provided with scores 5 around the axis thereof, wherein a part of the spike portions 21 abut against the scores 5, the cross section of the scores 5 is concave, and the thickness of the explosion-proof sheet 1 is 0.4 mm. The cambered surface is formed by outwards protruding the elastic sealing piece 2 under the pushing of the pressure in the battery, the sharp part 21 moves towards the direction of the nick 5 on the explosion-proof piece 1, the nick 5 explodes, the battery is rapidly decompressed, the cross section of the nick 5 is designed to be concave, the difficulty of forming the nick 5 is reduced, the production cost is reduced, the thickness of the limited explosion-proof piece 1 is the maximum value, the thickness of the explosion-proof piece 1 is prevented from being too large, and the overall cost of the explosion-proof device is increased.
Other structures are the same as those of the first embodiment, and are not described herein again.
Third embodiment
The difference from the first embodiment is that: the edges of the rupture disk 1 and the seal 2 of the present embodiment are each provided with a concave portion, and the inside of the retainer ring 4 is provided with a convex portion that fits into the concave portion. The convex part of retainer plate 4 inboard cooperates with the concave part of explosion-proof piece 1 and sealing member 2, plays the effect of fixed explosion-proof piece 1 and sealing member 2, reduces the probability that the both ends of explosion-proof piece 1 and sealing member 2 take place the displacement or rock, ensures explosion-proof equipment normal use.
Other structures are the same as those of the first embodiment, and are not described herein again.
Embodiment IV
A lithium ion battery comprising the battery explosion protection apparatus of embodiment one.
Fifth embodiment
A lithium ion battery comprising the battery explosion protection apparatus of embodiment two.
Sixth embodiment
A lithium ion battery includes the battery explosion-proof device of the third embodiment.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to 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 (9)
1. A battery explosion-proof apparatus, characterized in that: including explosion-proof piece (1) and setting up elastic sealing member (2) of explosion-proof piece (1) below, explosion-proof piece (1) is provided with a plurality of exhaust hole (11), one of them exhaust hole (11) set up the center of explosion-proof piece (1), remaining exhaust hole (11) use this exhaust hole (11) evenly to set up as the center explosion-proof piece (1), the top surface of explosion-proof piece (1) is provided with protection film (3), protection film (3) cover a plurality of exhaust hole (11), sealing member (2) are provided with a plurality of spine portion (21), spine portion (21) with exhaust hole (11) correspond, explosion-proof piece (1) with be provided with retainer plate (4) between sealing member (2).
2. A battery explosion-proof apparatus as defined in claim 1, wherein: the height of the spine part (21) in the center of the seal (2) is greater than the height of the remaining spine parts (21).
3. A battery explosion-proof apparatus as defined in claim 1, wherein: the edge of the explosion-proof sheet (1) and the edge of the sealing element (2) are both provided with concave parts, and the inner side of the fixing ring (4) is provided with convex parts matched with the concave parts.
4. A battery explosion-proof apparatus as defined in claim 1, wherein: scores (5) are arranged on the explosion-proof sheet (1) around the axis of the explosion-proof sheet, and a part of the sharp thorn parts (21) are abutted to the scores (5).
5. A battery explosion-proof apparatus as defined in claim 4, wherein: the cross section of the nick (5) is concave.
6. A battery explosion-proof apparatus as defined in claim 1, wherein: the top of the spike part (21) is conical.
7. A battery explosion-proof apparatus as defined in claim 1, wherein: the explosion-proof sheet (1) and the sealing element (2) are arranged in parallel.
8. A battery explosion-proof apparatus as defined in claim 1, wherein: the thickness of the explosion-proof sheet (1) is 0.3mm-0.4 mm.
9. A lithium ion battery, characterized by: comprising the battery explosion protection device according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022519738.2U CN213752947U (en) | 2020-11-04 | 2020-11-04 | Battery explosion-proof device and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022519738.2U CN213752947U (en) | 2020-11-04 | 2020-11-04 | Battery explosion-proof device and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213752947U true CN213752947U (en) | 2021-07-20 |
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ID=76819470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022519738.2U Active CN213752947U (en) | 2020-11-04 | 2020-11-04 | Battery explosion-proof device and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213752947U (en) |
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2020
- 2020-11-04 CN CN202022519738.2U patent/CN213752947U/en active Active
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