CN109817864B - Soft packet of power battery puncture air guide relief valve - Google Patents
Soft packet of power battery puncture air guide relief valve Download PDFInfo
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- CN109817864B CN109817864B CN201811620868.6A CN201811620868A CN109817864B CN 109817864 B CN109817864 B CN 109817864B CN 201811620868 A CN201811620868 A CN 201811620868A CN 109817864 B CN109817864 B CN 109817864B
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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 invention discloses a puncture gas guide pressure relief valve of a soft package power battery, which comprises a ring cover, a connecting ring, a ring body, a gas one-way valve, a waterproof breathable film, a ring cover and a puncture part, wherein the connecting ring is arranged on the ring cover; one end of the connecting ring is fixedly connected with one end of the ring cover, and the other end of the connecting ring extends into the ring body and is in interference fit with the ring body; the puncturing part is fixed at the other end of the ring body; the ring cover is in a truncated cone shape with an upper opening and a lower opening, one end with a smaller diameter of the ring cover is fixedly connected with the wall body of the ring body, one end with a larger diameter of the ring cover is fixedly connected with the outer package of the soft package power battery, and the punctured part is contained in the ring cover; the ring cover, the connecting ring, the ring body and the ring cover are coaxially arranged; the waterproof breathable film is arranged in the ring body; the gas one-way valve is arranged in the ring cover to prevent external air from entering the soft package battery. The invention greatly reduces the danger of bag expansion and liquid leakage after the internal pressure of the soft package power battery is increased, and improves the use safety of the power battery.
Description
Technical Field
The invention relates to the field of power soft package power batteries, in particular to a puncture air guide pressure relief valve of a soft package power battery.
Background
The power batteries with various structures comprise a square aluminum shell power battery, a cylindrical steel shell power battery and a plastic package power battery. Because the mass proportion of the shell of the plastic packaging flexible package lithium ion battery to the total mass of the battery core is the minimum, and the mass proportion of the accessory facilities is the minimum, the plastic packaging flexible package lithium ion battery with the largest specific energy in the three battery forms is the plastic packaging flexible package lithium ion battery. The soft package battery can be more easily made to have larger specific energy and energy density. The outer package of the soft package battery is a nylon-aluminum-PP three-layer superposed aluminum-plastic film, and the seal of the packaging material directly seals the two layers of aluminum-plastic films in a hot pressing manner. The internal air pressure of the power battery is continuously increased in the using process, and a seal formed by the aluminum-plastic film through hot-pressing sealing is easy to crack, so that the service life and the use safety of the battery are influenced due to the leakage of the battery.
Disclosure of Invention
The invention aims to solve the technical problem of providing a puncture gas guide pressure relief valve of a soft package power battery aiming at the defects in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
a puncture gas guide pressure relief valve of a soft package power battery is arranged on the sealing side of the soft package power battery and comprises a ring cover, a connecting ring, a ring body, a gas one-way valve, a waterproof breathable film, a ring cover and a puncture part;
the ring cover, the connecting ring and the ring body are all in a hollow ring shape with openings at two ends; one end of the connecting ring is fixedly connected with one end of the ring cover, and the other end of the connecting ring extends into the ring body and is in interference fit with the ring body, so that the ring cover is fixed at one end of the ring body;
the puncturing part is fixed at the other end of the ring body;
the ring cover is in a truncated cone shape with an upper opening and a lower opening, one end with a smaller diameter of the ring cover is fixedly connected with the wall body of the ring body, one end with a larger diameter of the ring cover is fixedly connected with the outer package of the soft package power battery, and the puncture part is contained in the ring cover; the ring cover, the connecting ring, the ring body and the ring cover are coaxially arranged;
the puncturing part is used for puncturing the outer package of the soft package power battery to release pressure when the soft package power battery expands to abut against the puncturing part;
the waterproof breathable film is arranged in the ring body and used for preventing electrolyte from flowing out after the outer package of the soft package power battery is punctured by the puncturing part;
the gas one-way valve is arranged in the ring cover and used for preventing external air from entering the soft package battery.
As a further optimization scheme of the puncture gas guide pressure relief valve of the soft package power battery, the outer walls of the ring cover and the ring body form an angle of 45 degrees, and an annular groove is formed in the end face of the end, with the larger diameter, of the ring cover, so that the ring cover can be conveniently connected with the outer package of the soft package power battery in an ultrasonic welding mode.
As a further optimization scheme of the puncture gas guide pressure relief valve of the soft package power battery, the ring cover, the connecting ring, the ring body and the ring cover are all made of high-temperature-resistant and corrosion-resistant nylon materials.
As a further optimization scheme of the punctured gas guide pressure relief valve of the soft package power battery, the gas one-way valve comprises a plurality of arc-surface-shaped valves, the roots of the valves are fixedly connected with the inner wall of the annular cover to form a hemispherical arc surface which is concave from the punctured part to the annular cover, and the thickness of the roots of the valves is gradually reduced to the thickness of the valves at the axis of the annular cover.
As a further optimization scheme of the puncture gas guide pressure relief valve of the soft package power battery, the valve is made of heat-resistant silica gel or rubber materials.
As a further optimization scheme of the puncture air guide pressure relief valve of the soft package power battery, the waterproof breathable film is made of EPTFE expanded polytetrafluoroethylene and is adhered to the inner wall of the ring body.
As a further optimization scheme of the puncture gas guide pressure relief valve of the soft package power battery, the puncture part comprises a knife head part and a mounting seat;
the cutter head part is formed by vertically intersecting two isosceles triangle-shaped blades at the vertical line to form a cross-shaped cutter point and a cross-shaped bottom;
the mounting seat is in a cross shape, and four tail ends of the mounting seat are respectively provided with a tenon which is wide outside and narrow inside and is in an isosceles trapezoid shape;
the bottom of the cutter head part is correspondingly fixed on the mounting seat;
the inner wall of one end of the ring body in the ring cover is provided with four riveting holes which are matched with the tenons at the four tail ends of the mounting seat in a one-to-one correspondence mode, and the mounting seat is in tenon riveting connection with the ring body through the tenons at the four tail ends of the mounting seat.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
the invention aims to ensure that external gas does not enter the battery to the maximum extent while high-pressure gas in the battery is released by puncturing the outer package of the flexibly packaged battery through the puncturing part. In order to realize that the outer package of the soft package battery is punctured by the puncturing part, a cross-shaped cutter head needs to be arranged to be aligned with the continuously expanded battery shell; in order to ensure that external gas does not enter the battery to have adverse effects on the redox reaction inside the battery, a valve structure with unidirectional gas guide needs to be arranged. The invention integrates two structures to deal with two problems, can well help solve the problems of gas expansion and liquid leakage of the soft package battery, and prolongs the service life of the soft package lithium ion battery.
Besides the cutter head, the invention adopts a large amount of nylon materials which are cheap and easy to process, so that the invention has low price and wide applicability. The simple and convenient installation method of ultrasonic welding is used, so that enterprises do not need to consider a large amount of cost brought by upgrading of installation equipment. The simple combination of the tenon-and-rivet connection and the interference fit also enables the invention to work simply and reliably throughout the life. It is a prerequisite for the power cell industry that a product be inexpensive and reliable for its application.
Drawings
Fig. 1 (a), fig. 1 (b), fig. 1 (c) and fig. 1 (d) are respectively a front view, an axonometric view, a top view and a left view of the present invention mounted on a pouch power cell;
FIG. 2 is an exploded view of the structure of the present invention;
FIG. 3 (a), FIG. 3 (b) are a front view and a cross-sectional view A-A in front view, respectively, of the present invention;
FIGS. 4 (a), 4 (b), 4 (c), 4 (d) are front, top, bottom and isometric views, respectively, of the ring body and ring cover of the present invention in cooperation therewith;
FIG. 5 (a), FIG. 5 (b), FIG. 5 (c), FIG. 5 (d) are bottom, top, left and isometric views, respectively, of a puncture in the present invention;
in the figure, 1-positive pole, 2-puncture gas guide pressure relief valve, 3-negative pole, 4-seal, 5-soft package power battery core, 6-ring cover, 7-connecting ring, 8-valve, 9-waterproof breathable film, 10-ring body, 11-ring cover, 12-rivet hole on the inner wall of the ring body, 13-mounting seat and 14-knife head.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
As shown in fig. 1 (a), fig. 1 (b), fig. 1 (c) and fig. 1 (d), the punctured gas guide pressure relief valve of the present invention is installed on the sealing side of the soft package power battery, between the positive electrode and the negative electrode, considering that multiple sheets of the power battery cell are stacked together for use during the use process, and the rest surfaces are not suitable for installing the gas guide pressure relief valve. The air guide pressure relief device is arranged in the middle of the surface, so that the middle of the surface firstly swells along with the increase of the internal air pressure and can firstly contact with the cutter head to complete the puncture action. The device is connected with the external package of the soft package battery through the end face of the end with the larger diameter of the lower ring cover in an ultrasonic welding mode. The outer package of the soft package battery is a nylon-aluminum-PP composite aluminum-plastic film, the nylon-plastic film is actually exposed on the outermost layer, the ring cover is made of the same nylon material and can be perfectly welded with the nylon-plastic film, and the soft package battery is simple and convenient to install and high in reliability. The air guide pressure relief device and the outer package of the soft package battery are welded in an ultrasonic mode, and the traditional gluing mode and other modes can achieve similar effects.
As shown in fig. 2, fig. 3 (a) and fig. 3 (b), the invention discloses a punctured gas guide pressure relief valve of a soft package power battery, which comprises a ring cover, a connecting ring, a ring body, a gas one-way valve, a waterproof breathable film, a ring cover and a punctured part; the ring cover, the connecting ring and the ring body are all in a hollow ring shape with openings at two ends; one end of the connecting ring is fixedly connected with one end of the ring cover, and the other end of the connecting ring extends into the ring body and is in interference fit with the ring body, so that the ring cover is fixed at one end of the ring body; the puncturing part is fixed at the other end of the ring body; the ring cover is in a truncated cone shape with an upper opening and a lower opening, one end with a smaller diameter of the ring cover is fixedly connected with the wall body of the ring body, one end with a larger diameter of the ring cover is fixedly connected with the outer package of the soft package power battery, and the punctured part is contained in the ring cover; the ring cover, the connecting ring, the ring body and the ring cover are coaxially arranged; the puncturing part is used for puncturing the outer package of the soft package power battery to release pressure when the soft package power battery expands to abut against the puncturing part; the waterproof breathable film is arranged in the ring body and is used for preventing the electrolyte from flowing out after the outer package of the soft package power battery is punctured by the puncturing part; the gas one-way valve is arranged in the ring cover and used for preventing external air from entering the soft package battery.
The end face of the end with the larger diameter of the ring cover is provided with an annular groove so as to be connected with the outer package of the soft package power battery in an ultrasonic welding mode.
The gas one-way valve comprises a plurality of arc-surface valves, the roots of the valves are fixedly connected with the inner wall of the ring cover to form a hemispherical arc surface which is concave to the ring cover from the puncture part, and the thickness of the roots of the valves becomes thinner gradually to the thickness of the valves at the axis of the ring cover. The curvature of the valve arc surface close to one side of the lower part of the ring cover is larger and is (1/12-1/8); wherein the curvature of the valve cambered surface close to one side of the upper part of the ring cover is smaller and is (0-1/20). Such arrangement can increase the contact area between valve and the inner wall of the annular cover on one hand, so that the bonding becomes more stable, and on the other hand, the combination of different curvatures on two sides of the valve can derive the forms of various valves, so that the backpressure caused by the cavity on one side of the valve is different, and finally the universality of the valve structure is stronger. All surfaces between the valves are in close contact, the valves are combined into a hemispherical cambered surface, and the combination of the curvatures of the valves and the elastic modulus of valve materials determine the valve to turn over when the internal air pressure reaches the valve, so that one-way air guide is realized. When the internal and external air pressures are balanced, the valve can be maintained in an original state to prevent external air from entering, the entering of external oxygen can influence the oxidation-reduction reaction inside the lithium battery, and the entering of external air needs to be restrained by the mechanism. The valve is made of heat-resistant silica gel or rubber material.
As shown in fig. 2, 3 (a), 3 (b), 4 (a), 4 (b), 4 (c) and 4 (d), the ring cover and the ring body are simply and reliably connected by interference fit using the connection ring. The ring body and the ring cover can be directly manufactured in an integrated forming mode. Preferably, the ring cover is at an angle of 45 degrees to the ring body. The angle between the ring cover and the ring body is allowed to change during design, and on the premise that the distance between the puncturing part and the flexible package is not changed, the larger the angle is, the smaller the internal pressure of the battery required by the puncturing part to puncture the flexible package is; the smaller the angle, the greater the internal pressure of the battery required to cause the puncturing portion to puncture the flexible package. The larger the angle between the ring cover and the ring body is, the larger the covering area of the ring cover is, and the larger the surface of the battery flexible package can expand outwards along with the increase of air pressure more easily; conversely, a smaller surface of the battery soft package will make the expansion with the air pressure less obvious.
The inner wall of the lower ring cover body is further bonded with a waterproof breathable film which is made of corrosion-resistant EPTFE expanded polytetrafluoroethylene, and the mounting position is arranged on the inner wall of the lower ring cover body at a position which is 3mm away from the top end of the lower ring cover body in the axial direction. The waterproof breathable film is used for preventing corrosive electrolyte which is possibly discharged along with internal gas after the soft package battery is punctured.
As shown in fig. 5 (a), 5 (b), 5 (c), and 5 (d), the piercing portion includes a cutter head portion and a mounting seat; the cutter head part is formed by vertically intersecting two isosceles triangle-shaped blades at the vertical line to form a cross-shaped cutter point and a cross-shaped bottom; the mounting seat is in a cross shape, and four tail ends of the mounting seat are respectively provided with a tenon which is wide outside and narrow inside and is in an isosceles trapezoid shape; the bottom of the cutter head part is correspondingly fixed on the mounting seat; the inner wall of one end of the ring body in the ring cover is provided with four riveting holes which are matched with four tail-end tenons of the installation seat in a one-to-one correspondence mode, and the installation seat is in tenon-rivet connection with the ring body through the four tail-end tenons of the installation seat. The depth of the riveting hole is consistent with the thickness of the tenon of the cutter head, the size of the riveting hole is slightly smaller than that of the tenon, and the riveting hole also belongs to interference fit in a certain sense. The setting of riveting hole lets the connection between mount pad and the ring body more convenient and stable. When the tool bit front end receives the oppression of soft-packing, the mount pad can receive the pressure that the ring body riveting hole gave, and the function of puncturing the lithium cell soft-packing is accomplished to the help tool bit to the retreat of suppression tool bit. The knife head part adopting the structure has better puncture rate compared with the traditional needle head structure for puncturing, and the knife head part mainly benefits from that the knife head part has larger effective area to just face the outer package of the soft package battery, and the sharp knife head and the sharp edge of the knife head part can be used for puncturing the outer package of the battery.
At the early stage of the service life of the flexibly packaged lithium battery, because of lower internal air pressure, the expansion of the outer package is not obvious, and the battery flexible package is not punctured by the puncturing part; with the further use of the battery, after the internal air pressure reaches a threshold value, the puncture part punctures the flexible package of the battery, the power battery discharges gas outwards through the waterproof breathable film and the valve, and the electrolyte is left in the battery; the air exhaust is stopped when the internal air pressure and the external air pressure are balanced, the internal reaction of the battery is continued to prepare for the next air exhaust and pressure relief, and the flexible package power battery is ensured not to have the danger of bag expansion and liquid leakage in the whole service life in such a reciprocating way.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A puncture gas guide pressure relief valve of a soft package power battery is arranged on the sealing side of the soft package power battery and is characterized by comprising a ring cover, a connecting ring, a ring body, a gas one-way valve, a waterproof breathable film, a ring cover and a puncture part;
the ring cover, the connecting ring and the ring body are all in a hollow ring shape with openings at two ends; one end of the connecting ring is fixedly connected with one end of the ring cover, and the other end of the connecting ring extends into the ring body and is in interference fit with the ring body, so that the ring cover is fixed at one end of the ring body;
the puncturing part is fixed at the other end of the ring body;
the ring cover is in a truncated cone shape with an upper opening and a lower opening, one end with a smaller diameter of the ring cover is fixedly connected with the wall body of the ring body, one end with a larger diameter of the ring cover is fixedly connected with the outer package of the soft package power battery, and the puncture part is contained in the ring cover; the ring cover, the connecting ring, the ring body and the ring cover are coaxially arranged;
the puncturing part is used for puncturing the outer package of the soft package power battery to release pressure when the soft package power battery expands to abut against the puncturing part;
the waterproof breathable film is arranged in the ring body and used for preventing electrolyte from flowing out after the outer package of the soft package power battery is punctured by the puncturing part;
the gas one-way valve is arranged in the ring cover and used for preventing external air from entering the soft package power battery.
2. A punctured gas guide pressure relief valve of a soft package power battery according to claim 1, wherein the outer walls of the ring cover and the ring body are at 45 degrees, and an annular groove is formed in the end face of the end, with the larger diameter, of the ring cover so as to be connected with the outer package of the soft package power battery in an ultrasonic welding mode.
3. The puncture gas guide pressure relief valve of the soft package power battery according to claim 1, wherein the ring cover, the connecting ring, the ring body and the ring cover are made of high-temperature-resistant and corrosion-resistant nylon materials.
4. A puncture gas guide pressure relief valve of a soft package power battery as claimed in claim 1, wherein the gas check valve comprises a plurality of arc-surface-shaped valves, the roots of the plurality of valves are fixedly connected with the inner wall of the annular cover to form a hemispherical arc surface which is concave from the puncture part to the annular cover, and the thickness of the valve roots becomes thinner gradually to the thickness of the valve at the axis of the annular cover.
5. A puncture gas guide pressure relief valve of a soft package power battery as claimed in claim 4, characterized in that the valve is made of heat-resistant silica gel or rubber material.
6. A puncture gas guide pressure relief valve of a soft package power battery as claimed in claim 1, wherein the waterproof breathable film is made of EPTFE expanded polytetrafluoroethylene and is glued on the inner wall of the ring body.
7. The punctured gas guide pressure relief valve of the soft package power battery according to claim 1, wherein the punctured part comprises a knife head part and a mounting seat;
the cutter head part is formed by vertically intersecting two isosceles triangle-shaped blades at the vertical line to form a cross-shaped cutter point and a cross-shaped bottom;
the mounting seat is in a cross shape, and four tail ends of the mounting seat are respectively provided with a tenon which is wide outside and narrow inside and is in an isosceles trapezoid shape;
the bottom of the cutter head part is correspondingly fixed on the mounting seat;
the inner wall of one end of the ring body in the ring cover is provided with four riveting holes which are matched with the tenons at the four tail ends of the mounting seat in a one-to-one correspondence mode, and the mounting seat is in tenon riveting connection with the ring body through the tenons at the four tail ends of the mounting seat.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811620868.6A CN109817864B (en) | 2018-12-28 | 2018-12-28 | Soft packet of power battery puncture air guide relief valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811620868.6A CN109817864B (en) | 2018-12-28 | 2018-12-28 | Soft packet of power battery puncture air guide relief valve |
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| CN109817864A CN109817864A (en) | 2019-05-28 |
| CN109817864B true CN109817864B (en) | 2020-07-24 |
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| CN201811620868.6A Active CN109817864B (en) | 2018-12-28 | 2018-12-28 | Soft packet of power battery puncture air guide relief valve |
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| CN113232085A (en) * | 2021-06-02 | 2021-08-10 | 江苏中远消防设备有限公司 | Full-section valve membrane piercing knife assembly of electric explosion valve |
Citations (3)
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|---|---|---|---|---|
| JP2013114991A (en) * | 2011-11-30 | 2013-06-10 | Hitachi Vehicle Energy Ltd | Secondary battery |
| CN106159152A (en) * | 2016-08-30 | 2016-11-23 | 南通鼎鑫电池有限公司 | A kind of safety device preventing lithium battery to expand blast |
| CN108198984A (en) * | 2017-12-01 | 2018-06-22 | 力神动力电池系统有限公司 | A kind of battery with novel unidirectional gas bleeder valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08171898A (en) * | 1994-12-16 | 1996-07-02 | Fuji Elelctrochem Co Ltd | Rectangular electrochemical element equipped with explosion-proof safety device and its manufacture |
| CN107994181B (en) * | 2017-10-30 | 2020-11-13 | 吉利汽车研究院（宁波）有限公司 | Balanced explosion-proof equipment of power battery |
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2018
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013114991A (en) * | 2011-11-30 | 2013-06-10 | Hitachi Vehicle Energy Ltd | Secondary battery |
| CN106159152A (en) * | 2016-08-30 | 2016-11-23 | 南通鼎鑫电池有限公司 | A kind of safety device preventing lithium battery to expand blast |
| CN108198984A (en) * | 2017-12-01 | 2018-06-22 | 力神动力电池系统有限公司 | A kind of battery with novel unidirectional gas bleeder valve |
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