KR20050007921A - Safety vent and electric energy storage device having the same - Google Patents

Abstract

PURPOSE: Provided is a screw-typed structure equipped with a safety valve which is easily fixed at one side of a storage system for electric energy so that it helps to improve efficiency in process. CONSTITUTION: The screw-typed structure equipped with the safety valve comprises the parts of: a cylindrical first member(410) which includes a screw mountain(410a) at the external wall of the structure for easy insertion with a first hole(410b) at the center; a second member(420) which is fixed at one edge of the first member with a second hole(420b) formed in the extension of the first hole; and a third member(460) which is placed on a metal foil(430) with a third hole(460a) formed in the advance direction of the second hole.

Description

Safety valve mounting structure and electric energy storage device including the same {SAFETY VENT AND ELECTRIC ENERGY STORAGE DEVICE HAVING THE SAME}

The present invention relates to a safety valve mounting structure and an electric energy storage device including the same, and more particularly, to a safety valve mounting structure and an electric energy storage device including the same.

When the physicochemical system is abnormally operated, the internal material changes and gas generation is accelerated, causing the internal pressure to rise and explode. A safety vent is installed outside the system to prevent the explosion. The safety valve is a safety means that prevents the explosion of the system by breaking when the pressure of the internal gas generated by abnormal operation of the system increases. That is, the part is designed to break in advance below the pressure at which the system explodes.

In general, when the system is exploded at a high pressure, a large damage is caused due to the high pressure, but the safety valve is broken at a pressure lower than the explosion pressure of the system, so that no serious damage to the system. Such safety valves have been applied in various fields as well as energy storage devices such as secondary batteries and capacitors.

1A is a schematic view showing an energy storage device having a general safety valve.

Referring to FIG. 1A, a conventional safety valve is formed by forming a groove 110 or thinning in the case 100, and the safety valve is broken at a low pressure when the internal pressure increases due to abnormal operation of the system. do. Therefore, large explosion can be prevented.

FIG. 1B is a cross-sectional view taken along the AA ′ direction of FIG. 1A.

Referring to FIG. 1B, when the groove 110 is cut in a portion of the energy storage device, the grooved portion becomes thinner than other portions of the energy storage device. In this way, the pressure at which the safety valve breaks is determined by the thickness and size by the groove. As described above, the groove is used as a safety valve and thus does not cause a large deformation during the process, which is used for structurally stable cylindrical products.

Figure 1c is a schematic diagram showing an energy storage device having a general external safety valve.

Referring to FIG. 1C, when the size of the energy storage device is large or the exterior is thick, it is not easy to form a groove in the case 150 of the energy storage device. In addition, in the case of non-cylindrical products, although the internal pressure increases, even though it is a dangerous situation, it may be dangerous because it is not broken as a safety valve. Therefore, after the hole 160 is formed in the energy storage case 150 itself, the safety side 170 designed to break at a certain air pressure is additionally installed. In general, if the safety valve is made of a metal material to form the same material as the exterior of the energy storage device, using a welding method or the like to attach to the energy storage device. That is, a thin metal plate is welded to the energy storage device to install a safety valve. At this time, the safety valve is welded to be completely blocked from the outside to sense the pressure of the energy storage device.

However, when welding to the case housing of the energy storage device, there is a possibility that the characteristics of the energy storage device itself is deformed by the heat for welding. Therefore, laser welding or electron beam welding should be used to prevent the deformation. However, the laser welding and electron beam welding increase the process cost.

In general, aluminum is used as the exterior of the energy storage device. However, the aluminum is a very difficult material to weld, and does not completely block the inside and outside of the energy storage device.

In addition, if the safety valve is installed directly on the energy storage device, the inspection is not easy after completing the energy storage device. For example, when the internal pressure of the energy storage device is inspected, if it is determined that the energy storage device is defective, the entire energy storage device including the safety valve cannot be used, thereby increasing economic losses.

Therefore, a first object of the present invention is to provide a safety valve mounting structure that can be easily mounted on the electrical energy storage device to improve the efficiency in the process.

It is a second object of the present invention to provide an electrical energy storage device including a safety valve mounting structure that is easy to mount.

1A is a schematic view showing an energy storage device having a general safety valve.

FIG. 1B is a cross-sectional view taken along the AA ′ direction of FIG. 1A.

Figure 1c is a schematic diagram showing an energy storage device having a general external safety valve.

Figure 2 is a schematic diagram showing a preferred safety valve mounting structure of the present invention.

3 is a cross-sectional view showing a safety valve mounting structure according to a first embodiment of the present invention.

Figure 4 is a cross-sectional view showing a safety valve mounting structure according to a second embodiment of the present invention.

5A is a schematic diagram of an electric energy storage device equipped with a safety valve according to Embodiment 3 of the present invention.

FIG. 5B is a cross-sectional view of the electric energy storage device equipped with the safety valve according to the third embodiment in the direction BB ′ of FIG. 5A.

FIG. 5C is a plan view of the winding body of FIG. 5B seen in a lamination direction. FIG.

In order to achieve the first object, the present invention, the outer wall is provided with a screw thread, the first member of the cylindrical having a first hole therein, a second hole extending in the longitudinal direction to be connected to the first hole And a safety side comprising a second side attached to one end of the first member and a metal side mounted to the second side to cover the second hole.

In order to achieve the second object, the present invention provides an electrical energy storage device including a winding body in which an anode, a separator, and a cathode are stacked, and a case including the winding body and having a hole on one surface thereof. The case is inserted into the hole, the outer wall is provided with a screw thread, the first member of the cylindrical having a first hole therein, a second hole extending in the longitudinal direction of the first hole, the first member A safety valve mounting structure including a safety valve comprising a second member attached to one end of the metal foil is mounted to the second member to cover the second hole.

Hereinafter, the present invention will be described in detail.

Safety seat mounting structure of the present invention is provided with a screw thread on the outer wall, a cylindrical first member having a first hole therein, a second hole extending in the longitudinal direction to be connected to the first hole, the first And a safety side including a second member attached to one end of the member and a metal foil mounted to the second member to cover the second hole.

The second member has a first thickness and has an area having a step having a diameter smaller than the diameter of the second member about the second hole so as to have a second thickness thinner than the first thickness. The groove is further provided in the region where the step is formed so that the O-ring is inserted.

And a third hole extending in the longitudinal direction to be connected to the second hole, and further obtaining a third member mounted on the safety side and press-fitted to be in close contact with the second member to fix the safety side.

At this time, the third hole is characterized in that the entrance of the portion where the third member is in contact with the second member is funnel-shaped.

Alternatively, the metal foil may be welded and mounted to the second member.

An electric energy storage device including the safety valve mounting structure includes a winding body in which an anode, a separator, and a cathode are stacked, and a case including the winding body and having a hole on one surface thereof. At this time, the case is inserted into the hole, the outer wall is provided with a screw thread, a first cylindrical member having a first hole therein, a second hole extending in the longitudinal direction of the first hole, A safety valve mounting structure including a second member attached to one end of the first member and a metal foil mounted to the second member to cover the second hole is provided.

Hereinafter, with reference to the drawings of the present invention will be described in more detail the safety valve mounting structure.

Figure 2 is a schematic diagram showing a preferred safety valve mounting structure of the present invention.

2, the safety valve mounting structure 200 of the present invention can be largely divided into two members. The first member 210 is a part fixed in the system, and the second member 220 is a part on which the safety valve metal foil is mounted.

The first member 210 has a cylindrical shape having a thread 210a at an outer wall and a first hole (not shown) at an inner center thereof. Thus, the first member 210 can be inserted in the same way as to tighten the screws in the system. The first hole is formed small enough to allow gas inside the system to escape.

The second member 220 has a second hole (not shown) in the center of the inside, and is attached to one end of the first member 210. At this time, the second hole is located on the extension line in the longitudinal direction of the first hole. The shape of the second member 220 is not limited to a specific shape, but it is designed to have a width wider than the diameter of the first member so that the contact area can be sufficiently supported when the first member is inserted into the system. It is desirable to. In addition, the second member is preferably designed to be close to a circle so that the pressure is evenly distributed when the first member is tightened in the system.

The metal member is attached to the second member so as to cover the second hole. According to the form in which the metal foil is mounted can provide a variety of safety valve mounting structure.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

3 is a cross-sectional view showing a safety valve mounting structure according to a first embodiment of the present invention.

Referring to FIG. 3, the safety valve mounting structure 300 is provided with a screw thread 310a on an outer wall and an extension line between the first member 310 and the first hole 310b having a first hole 310b therein. The second member 320 includes a second hole 320b and is connected to the first member 310. In this case, the first member 310 and the second member 320 may be formed integrally or provided in an attached form.

The second member 320 attached to one end of the first member 310 is designed to have a diameter larger than that of the first member 310 so that when the first member 310 is inserted into the system, It is desirable to increase the area in contact with the system so that it can be sufficiently supported by the system. In addition, the second member 320 is preferably designed to be close to a circle so that the pressure is evenly distributed when the first member 310 is tightened in the system.

The second member 320 is mounted with a metal foil 330 in an opposite direction connected to the first member 310. That is, the metal foil 330 is mounted to cover the second hole 320b. In this case, in order to facilitate mounting of the metal foil 330, a predetermined step is generated around the second hole 320b to form a welding region 340. Accordingly, the metal foil 330 is attached to the stepped welding area 340 to be partially welded to disconnect the system from the outside.

Therefore, when the pressure inside the system rises, gas is applied to the metal foil 330 through the first and second holes 310b and 320b, and when the pressure exceeds a predetermined pressure, the metal foil 330 breaks. It can prevent a big explosion.

Example 2

Figure 4 is a cross-sectional view showing a safety valve mounting structure according to a second embodiment of the present invention.

The safety valve mounting structure 400 has a cylindrical first member 410 having a thread 410a on its outer wall and a first hole 410b at its inner center for easy insertion into the system in a threaded manner. In addition, a second hole 420b positioned on an extension line of the first hole 410b and a second member 420 attached to one end of the first member 410 are provided.

The second member 420 is designed to have a width wider than the diameter of the first member 410 to increase the area where the system and the first member contact each other when the first member is inserted into the system. In addition, the second member is preferably designed to be close to a circle so that the pressure is evenly distributed when the first member is tightened in the system.

The second member has a first thickness A, and a groove 450a into which an O-ring 450 is inserted is dug around the second hole of the second member. The groove 450a is formed spaced apart from the second hole by a predetermined interval. The boundary between the groove and the second hole has a second thickness B lower than the first thickness A. FIG.

Therefore, the second member has a step in the central portion including the second hole. The metal foil 430 is placed in an area where the step is generated, and a third member 460 is press-fitted to fix the metal foil on the metal foil.

That is, the metal foil is mounted to cover the second hole, and the third member is pressed onto the metal foil to be in close contact with the O-ring to disconnect the inside of the system from the outside.

The third member has a third hole 460a extending in the advancing direction of the second hole. In the third hole 460a, an inlet of the portion where the third member 460 is in contact with the second member 420 has a first width C, and an opposite inlet has a second width D. It is preferable to form in a funnel shape. That is, by limiting the contact area between the third member 460 and the second member 420 to the area where the O-ring 450 is mounted, the third member 460 is press-fit into the second member 420. When the O-ring 450, the adhesion of the third member 460 and the second member 420 may be further improved.

In addition, when the pressure inside the system rises and an internal forming gas is applied to the metal foil through the first and second holes to a predetermined pressure or more and the metal foil is broken, debris can be easily discharged to the outside through the third hole. Can be. In addition, since welding is not performed to install the metal foil, the electrical energy storage device can be prevented from being damaged.

Example 3

5A is a schematic diagram of an electric energy storage device equipped with a safety valve according to Embodiment 3 of the present invention, and FIG. 5B is a cross-sectional view of the electric energy storage device with a safety valve according to Embodiment 3 in the direction BB ′ of FIG. 5A. 5C is a plan view of the winding body of FIG. 5B seen in the lamination direction.

5A, 5B, and 5C, the safety valve mounting structure 500 is mounted to one surface of a system 590 such as an electrical energy storage device. The system includes a winding 595 in which an anode 592, an electrode isolation film 593, and a cathode 594 are stacked. The wound body 595 is laminated using the winding body isolation film 591. The positive electrode and the negative electrode of the winding body are connected to the positive electrode terminal 596a and the negative electrode terminal 596b exposed to the outside by the positive electrode lead wire 595a and the negative electrode lead wire 595b. The positive terminal 596a and the negative terminal 596b are fixed to the system by the nut 597. In addition, one surface of the system 590 is provided with a hole, so that the safety valve mounting structure can be easily mounted into the hole.

The safety valve mounting structure 500 is inserted into the hole, the outer wall is provided with a screw thread, and includes a first cylindrical member having a first hole therein, the second hole extending in the longitudinal direction of the first hole And a second member 520 attached to one end of the first member. In addition, a metal foil is mounted on the second member 520 to cover the second hole. In addition, the metal foil may be fixed by pressing the third member 560 on the metal foil.

The second member 520 is designed to have a width wider than the diameter of the first member so that the area where the system 590 and the first member abut each other when the first member is inserted into the system 590. Increase. In addition, the second member 520 is preferably designed to be close to a circle so that the pressure is evenly distributed when the first member is tightened to the system 590.

The third member 560 includes a third hole 560a extending in the advancing direction of the second hole. In addition, when the pressure inside the system 590 rises and an internal forming gas is applied to the metal foil through the first and second holes to a predetermined pressure or more and the metal foil is broken, the debris passes through the third hole 560a. It can be easily discharged to the outside.

According to the present invention as described above, after mounting the safety valve to the structure having a screw form, the structure is mounted in the form of screw insertion in a system such as an electrical energy storage device.

As such, by mounting the screw-type structure including the safety valve to the system without mounting the safety valve itself to the system, the mounting may be easily performed and the welding process may not be performed. In addition, since it is easy to attach and detach, the inspection such as measuring the internal pressure of the completed electrical energy storage device can be easily performed, and when a defect occurs, it can be detached and reused. Therefore, the process cost and time can be reduced to increase the process efficiency.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified without departing from the spirit and scope of the invention described in the claims below. And can be changed.

Claims (7)

A cylindrical first member having a thread on an outer wall and having a first hole therein; A second member having a second hole extending in a longitudinal direction so as to be connected to the first hole and attached to one end of the first member; And Safe side mounting structure comprising a safety side made of a metal foil mounted to the second member to cover the second hole. 2. The area of claim 1, wherein the second member has a first thickness and has a step having a diameter smaller than the diameter of the second member with respect to the second hole to have a second thickness that is thinner than the first thickness. Safety valve mounting structure characterized in that having a. The method of claim 2, further comprising a third hole extending in the longitudinal direction to be connected to the second hole, and is further provided with a third member mounted on the safety side and pressed in close contact with the second member. Safety valve mounting structure. The safety valve mounting structure according to claim 3, further comprising a groove in which the O-ring is inserted in the stepped area. According to claim 3, The third hole is a safety valve mounting structure, characterized in that the entrance of the portion where the third member is in contact with the second member is a funnel. The safety valve mounting structure according to claim 1, wherein the metal foil is welded to the second member. Iii) a winding body in which an anode, a separator and a cathode are laminated; Ii) a case including the winding body and having a hole on one surface; And Iii) a cylindrical first member inserted into the hole and having a thread on an outer wall thereof and having a first hole therein; A second member having a second hole extending in the longitudinal direction of the first hole and attached to one end of the first member; And And a safety valve mounting structure including a safety valve made of a metal foil mounted to the second member so as to cover the second hole.