CN213816358U

CN213816358U - Explosion-proof valve and single battery

Info

Publication number: CN213816358U
Application number: CN202022520649.XU
Authority: CN
Inventors: 沈桂元
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2021-07-27
Anticipated expiration: 2030-11-04

Abstract

The utility model discloses an explosion-proof valve and battery cell belongs to battery production technical field. The explosion-proof valve is used on the shell and comprises a valve body and a waterproof breathable film, the valve body is detachably connected on the shell, and the valve body is provided with a vent hole which is communicated with the outside and the inside of the shell; the holding tank has been seted up to the valve body, and in the holding tank was located to waterproof ventilated membrane, the bleeder vent was linked together with the casing through the holding tank to make the inside gas of casing discharge via holding tank, waterproof ventilated membrane and bleeder vent in proper order. The explosion-proof valve provided by the utility model can make the internal gas enter the holding tank first when the battery expands through the matching of the waterproof breathable film and the valve body, and further gradually and slowly discharge through the air holes to complete explosion-proof, so that the rupture and damage of the battery can not be caused, and further the service life and the capacity of the battery can not be influenced; meanwhile, the explosion-proof valve is connected with the shell in a detachable connection mode, and the disassembly and the assembly are convenient.

Description

Explosion-proof valve and single battery

Technical Field

The utility model relates to a battery production technical field especially relates to an explosion-proof valve and battery cell.

Background

As the energy density of the power battery is higher and higher, the safety of the power battery in use is more important, the internal air pressure of the single battery is increased when the single battery is discharged, and when the maximum limit which can be borne by the shell is reached, the battery is broken and damaged, and fire or explosion is caused. The single battery usually adopts the trompil and sets up shutoff formula explosion-proof valve in trompil department, and when the battery took place the inflation, atmospheric pressure destroys the explosion-proof valve earlier and releases inside atmospheric pressure by the trompil, avoids whole battery's fracture.

However, the plugging type explosion-proof valve is often assembled by adopting a welding mode, the process difficulty is high, the labor hour is consumed, the valve cannot be disassembled after being installed, the plugging type explosion-proof valve is decompressed by adopting a destructive mode, and the service life and the battery capacity of the whole battery are influenced while explosion is prevented.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an explosion-proof valve can be on the basis of not destroying explosion-proof valve the inside atmospheric pressure of discharge battery, carries out explosion-proofly.

An object of the utility model is also to provide a battery cell, can be when explosion-proof smoothly, still can not exert an influence to life and battery capacity.

In order to realize the purpose, the following technical scheme is provided:

an explosion-proof valve is used on a shell and comprises a valve body and a waterproof breathable film, wherein the valve body is detachably connected to the shell, and is provided with a breathable hole which is communicated with the outside and the inside of the shell;

the holding tank has been seted up to the valve body, waterproof ventilated membrane is located in the holding tank, the bleeder vent passes through the holding tank with the casing is linked together, so that the inside gas of casing is via in proper order the holding tank waterproof ventilated membrane with the bleeder vent is discharged.

Optionally, a diversion trench is further arranged on the valve body, and the air holes are communicated with the accommodating groove through the diversion trench.

Optionally, the diversion trench is of an annular structure; the width of the connection part of the guide groove and the air holes is smaller than that of the connection part of the guide groove and the accommodating groove.

Optionally, at least one of the inner and outer channel walls of the flow guide channel is of a conical structure.

Optionally, the bleeder vent is an L-shaped structure, the air inlet end of the bleeder vent is arranged at the groove top of the accommodating groove, and the air outlet end of the bleeder vent is arranged on the circumferential side wall of the valve body.

Optionally, the air holes are arranged in a plurality, and the air outlet ends of the air holes are uniformly distributed on the circumferential side wall of the valve body.

Optionally, an external thread is arranged on the outer wall of the valve body, a threaded hole is formed in the housing, and the valve body is in threaded connection with the threaded hole.

Optionally, the explosion-proof valve further comprises a sealing element, a mounting boss is arranged on the outer peripheral surface of the valve body, and the sealing element is pressed between the mounting boss and the housing.

Optionally, the outer edge of the mounting boss is of a hexagonal configuration.

A single battery comprises the explosion-proof valve.

Compared with the prior art, the beneficial effects of the utility model are that:

the explosion-proof valve provided by the utility model can make the internal gas enter the holding tank first when the battery expands through the matching of the waterproof breathable film and the valve body, and further gradually and slowly discharge through the air holes to complete explosion-proof, so that the rupture and damage of the battery can not be caused, and further the service life and the capacity of the battery can not be influenced; meanwhile, the explosion-proof valve is connected with the shell in a detachable connection mode, and the disassembly and the assembly are convenient.

Drawings

Fig. 1 is an exploded schematic view of a single battery according to an embodiment of the present invention;

fig. 2 is a top view of a single battery according to an embodiment of the present invention;

fig. 3 is a partial cross-sectional view a-a of fig. 2.

Reference numerals:

10. a housing; 20. an explosion-proof valve;

11. an end plate; 12. a threaded hole; 21. a valve body; 22. a waterproof breathable film; 23. a seal member; 211. air holes are formed; 212. accommodating grooves; 213. a diversion trench; 214. and (5) mounting a boss.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1-3, the embodiment is directed to providing an explosion-proof valve, which is used on a housing 10, the explosion-proof valve 20 includes a valve body 21 and a waterproof and breathable film 22, the valve body 21 is detachably connected to the housing 10, a vent hole 211 is formed on the valve body 21, and the vent hole 211 communicates with the outside and the inside of the housing 10; furthermore, the valve body 21 is of a cylindrical structure, an accommodating groove 212 is formed in one end of the valve body 21 located in the housing 10, and the waterproof breathable film 22 is arranged in the accommodating groove 212; the vent holes 211 are communicated with the housing 10 through the receiving groove 212, so that the gas inside the housing 10 is exhausted to the outside (refer to the arrow direction in fig. 3) through the receiving groove 212, the waterproof breathable film 22 and the vent holes 211 in sequence.

The waterproof breathable film 22 is a permselective film which allows gas to pass through but does not allow liquid to pass through, so when the battery works, electrolyte cannot leak to the outside from the waterproof breathable film 22, but gas in the battery charging and discharging process escapes from the waterproof breathable film 22 and is discharged to the outside to be decompressed. When the explosion-proof valve 20 provided by the embodiment is used on the shell 10 of the battery, the explosion-proof valve 20 is matched with the valve body 21 through the waterproof breathable film 22, so that the internal gas generated when the battery expands can enter the accommodating groove 212 first, and further can be gradually and slowly discharged through the vent holes 211 to complete explosion-proof, the rupture and damage of the battery cannot be caused, and further the service life of the battery and the capacity of the battery cannot be influenced.

Optionally, the waterproof breathable film 22 may be disposed in the accommodating groove 212 by bonding, or may be fixed by welding, or other connection methods, which is not limited herein, as long as the waterproof breathable film 22 can be stably placed in the accommodating groove 212. In this embodiment, the waterproof breathable film 22 is conveniently placed by the accommodating groove 212, and the gas in the housing 10 can be gathered in the accommodating groove 212, so that the waterproof breathable film 22 escapes from the accommodating groove.

The plurality of air holes 211 are arranged, and the air outlet ends of the plurality of air holes 211 are uniformly distributed on the circumferential side wall of the valve body 21; the plurality of ventilation holes 211 help to increase the amount of air discharged per unit time, and the number of the ventilation holes 211 may be set to be different according to the capacity of the battery and the amount of air discharged during operation. Specifically, in some embodiments, the air hole 211 is a vertical through hole, that is, the air inlet end and the air outlet end of the air hole 211 are respectively disposed at the top of the accommodating groove 212 and the top of the valve body 21. In the present embodiment, referring to fig. 3, the air hole 211 is an L-shaped structure, the air inlet end of the air hole 211 is disposed at the top of the accommodating groove 212, and the air outlet end is disposed on the circumferential side wall of the valve body 21, that is, the air hole 211 extends along an L-shaped path starting from the top of the accommodating groove 212 until penetrating through the side of the valve body 21, and further the escape path of the gas inside the housing 10 is L-shaped; compared with a structure that the air holes 211 are arranged vertically, the L-shaped structure can increase the escape distance of air and reduce the escape speed, so that the exhaust process is performed more slowly and stably, and the shape structure of the shell 10 cannot be suddenly changed.

With continued reference to fig. 3, the valve body 21 is further provided with a flow guide groove 213, the air holes 211 are communicated with the accommodating groove 212 through the flow guide groove 213, and the air flow in the accommodating groove 212 enters each air hole 211 after passing through the flow guide groove 213; in consideration of the structural strength of the valve body 21, the aperture of the air holes 211 is small, and the size of the accommodating groove 212 for accommodating the waterproof breathable film 22 is large, so that the flow guide structure is required to be arranged to dredge the air flow in the accommodating groove 212, so that the air flow smoothly enters the air holes 211, and the exhaust process is smooth. Further, the guiding groove 213 is of an annular structure, and the width d1 of the connection between the guiding groove 213 and the air hole 211 is smaller than the width d2 of the connection between the guiding groove 213 and the accommodating groove 212, so as to smoothly distribute the air flow. The flow guide groove 213 and the ventilation hole 211 are in smooth transition so that the airflow can smoothly enter the ventilation hole 211. Optionally, the flow guide groove 213 includes an inner groove wall close to the central axis of the valve body 21 and an outer groove wall far from the central axis of the valve body 21, and at least one of the inner groove wall and the outer groove wall of the flow guide groove 213 is of a tapered structure, so as to meet the requirement that the airflow flux of the flow guide groove 213 is gradually reduced along the gas escape direction, so as to meet the small flux requirement of the vent 211, and ensure smooth delivery of the airflow. In this embodiment, the inner wall of the guiding groove 213 is a tapered structure, and the outer wall is a straight structure extending along the vertical direction. Of course, in some other embodiments, the inner and outer walls of the diversion trench 213 may be both tapered; alternatively, the inner wall of the flow guide groove 213 is a straight line structure extending in the vertical direction, and the outer wall is a tapered structure.

Alternatively, the valve body 21 is detachably connected with the housing 10 through a screw structure; specifically, referring to fig. 1 and 3, an external thread is arranged on the outer wall of the valve body 21, a threaded hole 12 is formed in the housing 10, and the valve body 21 is in threaded connection with the threaded hole 12, so that the explosion-proof valve 20 is fastened and detachably connected with the housing 10. This kind of detachable mode of threaded connection makes when normal use, explosion-proof valve 20 can not break away from by casing 10 and cause the leakage, still has the advantage that assembly process is simple, easy dismounting simultaneously, can save production man-hour. The outer peripheral surface of the valve body 21 is also provided with a mounting boss 214; alternatively, referring to fig. 2, the outer edge of the mounting boss 214 is hexagonal, which facilitates the threaded assembly of the valve body 21 and the housing 10 by using a tool such as a wrench. In some other embodiments, the valve body 21 and the housing 10 may be connected by a snap fit or other detachable connection.

Further, a sealing member 23 is disposed between the valve body 21 and the housing 10 for ensuring the sealing of the joint between the valve body 21 and the housing 10 and preventing the liquid in the housing 10 from escaping at the joint to cause leakage. Optionally, the seal 23 is compressed between the mounting boss 214 and the housing 10. Further optionally, the sealing element 23 is a silica gel ring, the silica gel ring has certain elasticity, and the valve body 21 can be extruded during installation, so that the sealing effect is fully ensured.

The present embodiment also provides a single battery, which includes the above-mentioned explosion-proof valve 20; the single battery further includes a case 10, and an explosion-proof valve 20 is provided on the case 10. Specifically, the setting position of the explosion-proof valve 20 is different depending on the type of the unit battery. For example, in the case of a cylindrical battery, the explosion-proof valves 20 are provided on both end surfaces in the axial direction of the cylindrical battery. For a prismatic battery, the explosion-proof valve 20 may be provided on either end plate 11 of the prismatic case 10; further, referring to fig. 1, the explosion-proof valve 20 may be disposed on the end plate 11 having the output terminal, so that the assembly of the output terminal and the assembly of the explosion-proof valve 20 are completed on the same end plate 11, facilitating the uniform manufacture and installation of the end plate 11.

Of course, the explosion-proof valve 20 provided in this embodiment is not limited to be used in a single battery, and the explosion-proof valve 20 may be used in any structure and place where explosion-proof exhaust is required.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. An explosion-proof valve is used on a shell (10), and is characterized by comprising a valve body (21) and a waterproof breathable film (22), wherein the valve body (21) is detachably connected to the shell (10), the valve body (21) is provided with a vent hole (211), and the vent hole (211) is communicated with the outside and the inside of the shell (10);

holding tank (212) have been seted up in valve body (21), waterproof ventilated membrane (22) are located in holding tank (212), bleeder vent (211) pass through holding tank (212) with casing (10) are linked together, so that the inside gas of casing (10) passes through in proper order holding tank (212) waterproof ventilated membrane (22) with bleeder vent (211) are discharged.

2. The explosion-proof valve according to claim 1, wherein a diversion trench (213) is further provided on the valve body (21), and the vent hole (211) is communicated with the accommodating groove (212) through the diversion trench (213).

3. Explosion-proof valve according to claim 2, characterized in that the guide channel (213) is of annular configuration; the width of the connection part of the guide groove (213) and the air holes (211) is smaller than that of the connection part of the guide groove (213) and the accommodating groove (212).

4. Explosion-proof valve according to claim 3, characterized in that at least one of the inner and outer groove walls of the guide groove (213) is of conical configuration.

5. The explosion-proof valve according to any one of claims 1 to 4, wherein the vent hole (211) has an L-shaped structure, an air inlet end of the vent hole (211) is disposed at the top of the accommodating groove (212), and an air outlet end of the vent hole (211) is disposed on the circumferential side wall of the valve body (21).

6. The explosion-proof valve according to claim 5, wherein the plurality of the ventilation holes (211) are provided, and the air outlet ends of the plurality of the ventilation holes (211) are uniformly distributed on the circumferential side wall of the valve body (21).

7. The explosion-proof valve according to claim 1, wherein the outer wall of the valve body (21) is provided with an external thread, the housing (10) is provided with a threaded hole (12), and the valve body (21) is in threaded connection with the threaded hole (12).

8. The explosion proof valve of claim 1 further comprising a sealing member (23), wherein a mounting boss (214) is provided on the outer peripheral surface of the valve body (21), and the sealing member (23) is pressed between the mounting boss (214) and the housing (10).

9. The explosion proof valve of claim 8 wherein the outer edge of the mounting boss (214) is of hexagonal configuration.

10. A battery cell comprising the explosion-proof valve according to any one of claims 1 to 9.