One-way exhaust valve for aluminum shell battery and test tool comprising one-way exhaust valve

Abstract

The utility model provides a one-way exhaust valve for an aluminum shell battery and a test tool comprising the one-way exhaust valve, and solves the problems that a one-way valve body structure on the surface of a battery outer cover cannot be repeatedly used, the requirement for installation precision is high, and the one-way exhaust valve is prone to plastic deformation after being pressed for a long time. At least one through hole is formed in the aluminum shell cover plate to be communicated with the interior of the battery, a sealing piece is further arranged at the through hole to movably seal the through hole, the sealing piece comprises a valve body, an elastic piece, a composite breathable film, a fluororubber nail, an air inlet end and an air outlet end, the air inlet end and the air outlet end are communicated, the air inlet end is embedded into the through hole and is clamped with the inner wall of the through hole, and the air outlet end is clamped with the outer wall of the fluororubber nail. The air outlet end blocks reverse permeation of external water vapor through the composite breathable film, the interior of the valve body is hollowed out to store the elastic piece and the fluororubber nail, and the fluororubber nail movably seals the top of the through hole through the elastic piece.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery safety protection technical field especially relates to a one -way exhaust valve for aluminum shell battery and test tool containing it. BACKGROUND

[0002] Sodium ion battery is easy to produce gas (such as H2, CO etc.) under overcharge, high temperature or abnormal working condition, and the traditional pressure relief valve is mostly one-time burst disc, which cannot be reused and cannot be directional exhaust. The welding process of traditional welded / screwed one-way valve is irreversible, and the cover plate needs to be damaged for maintenance. There is a risk of electrolyte seepage into the thread gap, and the installation precision is high. Conventional adhesives (such as epoxy resin) are easy to age and become brittle in the high temperature (> 80 DEG C) environment of sodium ion battery, resulting in sealing failure. The existing rubber plug type one-way valve is mostly made of single rubber material, which is easy to deform plastically after long-term pressure, resulting in the decrease of sealing pressure. The cover plate structure of aluminum shell battery is compact, and the installation of traditional valve body occupies a large space, which affects the energy density of the battery.

[0003] Therefore, we propose a one-way exhaust valve for aluminum shell battery and test tool containing it to solve the above problems. CONTENT OF UTILITY MODEL

[0004] The utility model solves the technical problem of overcoming the defects of prior art, and provides a one-way exhaust valve for aluminum shell battery and test tool containing it, which aims to provide a one-way valve with repeated opening and closing, high sealing performance and corrosion resistance, realizes directional exhaust and isolates external environment. Optimize the valve body structure, reduce the cost, reduce the volume, adapt to the gas production characteristics and electrolyte corrosion environment of sodium ion battery.

[0005] To solve the above technical problems, the utility model adopts the technical scheme: a one-way exhaust valve for sodium ion aluminum shell battery, including aluminum shell cover plate, at least one through hole is set up on the aluminum shell cover plate to communicate the inside of the battery, a sealing element is further arranged at the through hole to movably seal the through hole, the sealing element includes a valve body, an elastic element, a composite gas permeable membrane, a fluororubber nail and a gas inlet end and a gas outlet end connected in communication, the gas inlet end is embedded in the through hole and is clamped with the inner wall of the through hole, the gas outlet end is blocked by the composite gas permeable membrane to prevent reverse penetration of external water vapor, the valve body is hollow to store the elastic element and the fluororubber nail, and the fluororubber nail is movably sealed on the top of the through hole by the elastic element.

[0006] Further, the composite gas permeable membrane is composed of PTFE microporous membrane and polyethylene support layer.

[0007] Further, the elastic element is a spring, and the top of the fluororubber nail is concave with a groove to be fixed with the bottom of the spring, and the top of the spring is fixed with the inner top of the valve body.

[0008] Further, the valve body is made of pp material, which comprises a base and an upper valve body, and the base and the upper valve body are fixed by gluing.

[0009] Further, the top of the base is provided with a ring table, the fluorine rubber nails are embedded in the ring table, and the bottom of the upper valve body is concave to embed the ring table.

[0010] Further, the outer surface of the upper valve body is provided with an arrow mark, and the direction of the arrow mark is guided from the air inlet end to the air outlet end.

[0011] Further, the air inlet end is integrally formed with the base, and the outer layer of the air inlet end is sleeved with a rubber plug composed of fluorine rubber and reinforced polytetrafluoroethylene.

[0012] Further, the rubber plug is a trapezoidal barb structure with wide upper part and narrow lower part, which is in interference fit with the inner wall of the through hole.

[0013] Further, the air outlet end is integrally formed with the upper valve body.

[0014] A battery test tool comprises the one-way exhaust valve for the aluminum shell battery.

[0015] Compared with the prior art, the beneficial effects of the utility model include: through the combination of elastic sealing element (static sealing) + air permeable film (dynamic waterproof), the leakage rate can be less than 0.01 mL / min, the form of movable sealing avoids the problems that the traditional sealing one-way valve cannot be directional exhaust and reused, the synchronous valve body structure is compact, relies on the interference fit between the rubber plug and the inner wall of the cover plate to form mechanical sealing, avoids the leakage risk of traditional threaded connection, and the structure selection not only ensures the repeated opening and closing and high sealing performance, but also considers the electrolyte corrosion resistance and stability. BRIEF DESCRIPTION OF DRAWINGS

[0016] The disclosure of the utility model will be explained with reference to the drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the protection scope of the utility model. In the drawings, the same reference signs are used to refer to the same parts. Among them:

[0017] Figure 1 The one-way exhaust valve explosion structure schematic diagram according to one embodiment of the utility model is schematically shown;

[0018] Figure 2 The one-way exhaust valve and aluminum shell cover plate assembly structure schematic diagram according to one embodiment of the utility model is schematically shown.

[0019] The figure label: 1, aluminum shell cover plate; 2, air inlet end; 3, fluorine rubber nail; 4, spring; 5, composite air permeable membrane; 6, upper valve body; 7, base; 8, arrow mark; 9, air outlet end; 10, ring table. DETAILED DESCRIPTION

[0020] It is easy to understand that according to the technical scheme of the utility model, a person skilled in the art can propose a plurality of structure modes and implementation modes which can be replaced with each other without changing the essential spirit of the utility model. Therefore, the following specific embodiments and drawings are only exemplary description of the technical scheme of the utility model, and should not be regarded as the whole or regarded as the limitation or restriction of the technical scheme of the utility model.

[0021] According to an embodiment of the utility model Figures 1-2 It is shown.

[0022] As Figure 1 shown, for the overall structure, a one-way exhaust valve for aluminum shell battery, including aluminum shell cover plate 1, the aluminum shell cover plate 1 is opened at least one through hole to communicate inside the battery, the through hole is also provided with sealing element to the through hole movable sealing, the sealing element includes valve body, elastic element, composite air permeable membrane 5, fluorine rubber nail 3 and the air inlet end 2 and the air outlet end 9 are communicated, the air inlet end 2 is embedded in the through hole and is engaged with the inner wall of the through hole, the air outlet end 9 is blocked by the composite air permeable membrane 5 and the external water vapor reverse osmosis, the valve body is hollow to store the elastic element and fluorine rubber nail 3, the fluorine rubber nail 3 is sealed by the elastic element to the top of the through hole.

[0023] To realize the movable sealing of the through hole on the top of the aluminum shell cover plate 1, the scheme is sealed by a fluorine rubber nail 3 to the top of the through hole, and the fluorine rubber nail 3 is supported by the elastic element moving in the radial direction at the top of the fluorine rubber nail 3, to realize the movable sealing of the top of the through hole, the fluorine rubber nail 3 as a sealing element is resistant to electrolyte corrosion, opens the exhaust when the gas in the battery reaches a certain pressure point (5±0.5KPa), and automatically resets the sealing through the elastic element at low pressure. During the exhaust process, the air outlet end 9 at the top is allowed to pass through only the gas through the composite air permeable membrane 5, to ensure that the electrolyte is exposed during pressure relief and the external water vapor reverse osmosis, which is convenient and reliable.

[0024] In the embodiment, the composite air permeable membrane 5 is composed of PTFE microporous membrane and polyethylene support layer.

[0025] And for the selection of elastic element, actually can include a variety, in this embodiment, considering the valve body internal space and the size of the pressure, select spring 4 as elastic element, synchronous in the top of the fluorine rubber nail 3 under the recess with the bottom of the spring 4 fixed, and the spring 4 top with the valve body inside top fixed, after the battery gas reaches the pressure point, spring 4 is forced to compress, corresponding fluorine rubber nail 3 lift to exhaust, and then spring 4 reset to re radial extrusion fluorine rubber nail 3 to seal the hole.

[0026] For the main structure of the valve body, the valve body is pp material, which includes base 7 and upper valve body 6, the base 7 and upper valve body 6 are glued and fixed, the top of the base 7 is protruded with ring table 10, the fluorine rubber nail 3 is embedded in the ring table 10, and the bottom of the upper valve body 6 is recessed to embed the ring table 10.

[0027] The air inlet end 2 is integrally formed with the base 7, and the air inlet end 2 is sleeved with a composite rubber plug. The rubber plug adopts a composite layer design of outer layer corrosion-resistant fluorine rubber (FKM) + inner layer reinforced polytetrafluoroethylene (ePTFE), which takes into account the elasticity and anti creep performance, and its outer structure is a trapezoidal barb structure which is wide at the top and narrow at the bottom, which forms an interference fit with the inner wall of the cover plate mounting hole, realizing mechanical self locking (anti falling out) and radial sealing double functions.

[0028] The air outlet end 9 is integrally formed with the upper valve body 6, and the arrow mark 8 is provided on the outer side of the upper valve body 6, the direction of the arrow mark 8 is along the air inlet end 2 to the air outlet end 9, for the operator to install.

[0029] In combination with the above one-way exhaust valve structure, the test work flow can be summarized as follows:

[0030] Exhaust stage: the internal pressure of the battery rises→ the spring 4 is compressed upwards and drives the fluorine rubber nail 3 to move upwards→ the exhaust passage is opened→ the gas passes through the exhaust passage→ the gas is discharged through the gas permeable membrane;

[0031] Sealing stage: after the pressure decreases, the spring 4 and the sealing element reset, and the gas permeable membrane prevents the reverse penetration of external water vapor.

[0032] In summary, the movable sealing type one-way exhaust valve structure in the present scheme has the following advantages:

[0033] 1. Through the combination of elastic sealing element (static sealing) + gas permeable membrane (dynamic waterproof), the leakage rate is less than 0.01 mL / min;

[0034] 2. For long-term sealing, after aging at 85℃ for 1000 hours, the springback rate of the rubber plug barb remains more than 90%;

[0035] 3. Corrosion resistance: after soaking in NaPF6 electrolyte (1M, 60℃) for 30 days, the volume expansion rate of the rubber plug is less than 3%.

[0036] 4. Temperature range: -40℃ ~ 100℃ working condition, the sealing pressure fluctuation < ± 5%;

[0037] 5. Installation efficiency: single press-in time < 2 seconds, speed up 300% compared with threaded connection;

[0038] 6. Maintainability: the rubber plug can be pulled out without damage by special tool, and the valve core assembly can be replaced.

[0039] Similarly, for a battery test tool comprising the above-mentioned one-way exhaust valve for aluminum shell battery, it should also be within the protection scope of the utility model.

[0040] The technical range of the utility model is not limited to the content in the above description, and the above-mentioned embodiments can be variously deformed and modified by the person skilled in the art without departing from the technical thought of the utility model, and these deformations and modifications should all be within the protection scope of the utility model.

Claims

1. A one-way exhaust valve for an aluminum can battery, comprising an aluminum can cover plate, at least one through hole is opened on the aluminum can cover plate to communicate the inside of the battery, characterized in that: The through hole is also provided with a sealing element for active sealing of the through hole, the sealing element comprising a valve body, an elastic element, a composite air-permeable membrane, a fluororubber nail and a gas inlet end and a gas outlet end connected in communication, the gas inlet end being embedded in the through hole and clamped with the inner wall of the through hole, the gas outlet end being blocked by the composite air-permeable membrane against reverse osmosis of external water vapor, the valve body being hollow inside to store the elastic element and the fluororubber nail, the fluororubber nail being active sealed on the top of the through hole by the elastic element.

2. A one-way vent valve for an aluminum can battery according to claim 1, wherein: The composite air-permeable membrane is composed of a PTFE microporous membrane and a polyethylene support layer.

3. The one-way vent valve for a sodium-ion aluminum can battery of claim 1, wherein: The elastic element is a spring, and the fluororubber nail is concave on the top to be fixed with the bottom of the spring, and the top of the spring is fixed with the inner top of the valve body.

4. A one-way vent valve for an aluminum can battery according to any one of claims 1-3, characterized in that: The valve body is made of pp material, which comprises a base and an upper valve body, and the base and the upper valve body are glued and fixed.

5. A one-way vent valve for an aluminum can battery according to claim 4, wherein: The top of the base is convex with a ring table, and the fluororubber nail is embedded in the ring table, and the bottom of the upper valve body is concave to embed the ring table.

6. A one-way vent valve for an aluminum can battery according to claim 5, wherein: The outer surface of the upper valve body is provided with an arrow mark, and the direction of the arrow mark is guided from the gas inlet end to the gas outlet end.

7. A one-way vent valve for an aluminum can battery according to claim 4, wherein: The gas inlet end is integrally formed with the base, and the outer layer of the gas inlet end is sleeved with a rubber plug composed of fluororubber and reinforced polytetrafluoroethylene.

8. A one-way vent valve for an aluminum can battery according to claim 7, wherein: The rubber plug is a trapezoidal barb structure with wide top and narrow bottom, which is interference fit with the inner wall of the through hole.

9. A one-way vent valve for an aluminum can battery according to claim 4, wherein: The gas outlet end is integrally formed with the upper valve body.

10. A battery testing tool, comprising: The one-way exhaust valve for the aluminum shell battery comprises the valve body, the elastic element, the composite air-permeable membrane, the fluororubber nail and the gas inlet end and the gas outlet end connected in communication.

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