WO2016068356A1

WO2016068356A1 - Electric energy storage device

Info

Publication number: WO2016068356A1
Application number: PCT/KR2014/010233
Authority: WO
Inventors: 천경상
Original assignee: 주식회사 지에스텍
Priority date: 2014-10-29
Filing date: 2014-10-29
Publication date: 2016-05-06

Abstract

An electric energy storage device, according to the present invention, comprises: a cylindrical case of which an upper part and a lower part are open so as to accommodate an electrode wound body; a lower cover terminal located at the lower part of the case and making contact with positive and/or negative polarities from the electrode wound body; an upper cover terminal coupled to the open upper part of the case, making contact with the remaining polarity from the electrode wound body, and having a discharge hole through which gas, generated inside the case, is discharged; and an active gas discharge terminal unit coupled to the upper cover terminal so as to automatically open or close the discharge hole in correspondence to an internal pressure of the case, caused by the gas.

Description

Electrical energy storage

The present invention relates to an electrical energy storage device, and more particularly, an active gas discharge terminal part is provided to actively discharge gas to the outside in response to the internal pressure caused by the gas generated therein, thereby providing The present invention relates to an electrical energy storage device capable of preventing a breakage and simplifying a structure while allowing a compact design design.

Compared with the discharge-only primary battery, the secondary battery that can be charged and discharged like a capacitor has a large effect on the resistance and efficiency of the secondary battery according to the connection method of terminals for electrically connecting the internal current source and the external resistance. In addition to receiving the secondary battery itself and the productivity of the user is also greatly affected.

Accordingly, there is a strong demand for a terminal connection method capable of increasing electric capacity and forming a small internal resistance and functioning as a secondary battery, and an electric energy storage device using the same.

1 is a perspective view showing an example of a cylindrical electric energy storage device according to the prior art.

As shown in FIG. 1, the cylindrical electric energy storage device 1 according to the related art has an upper and a lower opening so that a core (not shown) and an electrode winding body (not shown) wound around the core are accommodated therein. And a cylindrical cover 10, an upper cover 20 and a lower cover (not shown) coupled to upper and lower portions of the case 10, and the upper cover 20 includes a positive terminal and a negative terminal ( 30) is provided to protrude.

However, one example of the cylindrical electrical energy storage device 1 according to the prior art, the pressure is excessively increased when the gas inevitably generated during the operation accumulates in the case 10, and by the increased internal pressure The case 10 may be deformed.

In particular, in order to prevent explosion, a metal or polymer membrane (Membrane) is provided inside the case 10 so as to rupture by the pressure of the gas, and after the metal or polymer membrane is ruptured, it cannot be used again. There is a problem that is terminated.

On the other hand, in recent years, in order to prolong the life, a technology for delaying an increase in the internal pressure due to gas has been developed by forming a predetermined gas storage space so that gas can accumulate inside the case 10. This causes a problem of increasing weight and volume of the storage device.

The present invention has been made to solve the above technical problem, to prevent damage to the case due to the accumulation of gas in the interior, and to realize the compactness of the product, electrical energy storage device that can improve the reliability and stability To provide that purpose.

An electrical energy storage device according to the present invention comprises a cylindrical case having an upper and a lower opening to receive an electrode winding body, and a lower portion of the case, and collecting a polarity of at least one of a positive electrode and a negative electrode from the electrode winding body. A lower cover terminal coupled to an upper portion of the case, and an upper cover terminal configured to discharge the other polarity from the electrode winding body and discharge holes through which gas generated in the case is discharged; It is coupled to the upper cover terminal includes an active gas discharge terminal for automatically opening or closing the discharge hole in response to the internal pressure of the case by the gas.

In addition, the active gas discharge terminal unit is fixed to cover the discharge hole outside the upper cover terminal in which the discharge hole is formed, and a coupling terminal having a discharge gas discharge hole for guiding the gas discharged from the discharge hole to the outside. Wow; And a plunger disposed in the discharge gas discharge hole so as to be movable by the gas discharged from the discharge hole, and the gas may be discharged into the discharge gas discharge hole when the plunger moves. Here, the plunger may be elastically supported in the discharge gas discharge hole.

In addition, the lower end of the discharge gas discharge hole is formed with a guide hole smaller than the inner diameter of the discharge gas discharge hole, the upper end of the discharge gas discharge hole is provided with an elastic member supporter having a communication hole smaller than the inner diameter of the discharge gas discharge hole, The plunger may be elastically supported by an elastic member provided between the plunger and the elastic member supporter.

In addition, between the plunger and the guide hole may be provided with a guide hole opening and closing member interlocking with the plunger and covering the upper end of the guide hole.

In addition, the discharge gas discharge hole is formed in a circular shape, the plunger is formed in a polygon, or the discharge gas discharge hole is formed in a circular shape, the plunger is formed in a circular shape inserted into the discharge gas discharge hole, A gas discharge path through which gas is discharged may be formed between the discharge gas discharge holes.

In addition, an installation hole in which the lower end of the coupling terminal is coupled is formed at the center of the upper surface of the upper cover terminal, and the coupling terminal may be screwed to the installation hole.

In addition, the coupling terminal may be provided with a flange portion for supporting a portion of the upper surface of the upper cover terminal corresponding to the edge of the installation hole, a first sealing may be interposed between the flange portion and the upper cover terminal.

In addition, the flange portion corresponding to the outside of the first sealing may be formed with an inclined portion for pressing the stepped portion formed in the coupling terminal when the coupling terminal is screwed into the installation hole.

In addition, a locking rib may be formed at an upper end of the case to protrude inward, and the upper cover terminal may be coupled to the case so as to be caught at an upper end of the locking rib through a second sealing that surrounds an edge of the upper cover terminal. . Here, the upper end of the case may be formed inward to surround the upper end of the second sealing.

In addition, an electrolyte storage unit may be formed between the upper cover terminal and the electrode winding body with the installation hole interposed therebetween and accumulating internal electrolyte in the case.

In addition, a first gas storage unit in which the gas is stored may be formed between the discharge hole and the guide hole.

In addition, an electrode lead part of an aluminum material may be further provided between the lower cover terminal and the electrode winding body, and the lower cover terminal, the electrode lead part, and a lower end of the case may be welded to each other by laser welding.

The electrical energy storage device according to the present invention actively responds to the pressure inside the case due to the accumulation of gas in the case, and discharges the gas to the outside of the case, thereby preventing damage to the case and improving durability. Have

In addition, since the electrical energy storage device according to the present invention actively discharges gas to the outside of the case, it is not necessary to form a separate gas storage space, and thus, the effect of miniaturization (compactness) of the product can be realized. Have

In addition, the electrical energy storage device according to the present invention has a simple structure, the effect of improving the assembly.

1 is a perspective view showing an example of an electric energy storage device according to the prior art,

2 to 4 are cross-sectional views showing the manufacturing procedure of the electrical energy storage device according to an embodiment of the present invention,

5 is an enlarged view illustrating an enlarged portion A of FIG. 4;

6 is a cross-sectional view showing another embodiment of the electrical energy storage device according to the present invention.

The terminology used herein is for the purpose of describing particular embodiments (suns, aspects, and embodiments) (or embodiments) only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms “comprises” or “consists” are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the electrical energy storage device according to the present invention will be described in detail with reference to the accompanying drawings.

2 to 4 are cross-sectional views showing a manufacturing procedure of the electric energy storage device according to an embodiment of the present invention, Figure 5 is an enlarged view of an enlarged portion A of FIG.

One preferred embodiment of the electrical energy storage device according to the present invention, as shown in Figure 2, the upper and lower cylindrical case 110 is opened to accommodate the electrode winding body 130 wound around the core 120 And the lower cover terminal 160 and the upper cover terminal 170 coupled to the opened lower and upper portions of the case 110, and the discharge hole corresponding to the internal pressure of the case 110 by gas. 175 includes an active gas discharge terminal 200 that automatically opens or closes.

Here, the lower cover terminal 160 is located below the case 110. In the exemplary embodiment of the present invention, the lower cover terminal 160 is coupled to completely shield the opened lower portion of the case 110, but the lower cover terminal 160 is formed to form the lower portion of the case 110. It may be formed integrally with the case 110.

The lower cover terminal 160 collects the polarity of at least one of the positive electrode and the negative electrode from the electrode winding body 130, and the upper cover terminal 170 is coupled to the opened upper portion of the case 110, wherein the electrode The other polarity is collected from the winding body 130. The upper cover terminal 170 has a discharge hole 175 through which the gas generated in the case 110 is discharged.

The core 120 is disposed vertically long in the center of the case 110, and the electrode winding body 130 is wound around the core 120 to be interviewed on the inner circumferential surface of the case 110. Is accepted. In the exemplary embodiment of the present invention, the electrode winding body 130 wound around the core 120 is accommodated in the cylindrical case 110, but the electrode winding body without the core may be accommodated in the case 110. Do.

A lower connection member 140 is connected to the lower end of the electrode winding body 130, and the lower connection member 140 has a rim 141 bent downward. The lower connection member 140 is provided to surround the edge of the lower cover terminal 160 and serves to mediate the coupling of the lower cover terminal 160 inside the lower end of the case 110.

The lower connection member 140 is connected to the lower end of the electrode winding body 130 so as to cover the lower electrode lead portion (not shown) provided with an aluminum foil material, and the lower cover terminal 160 is a laser By welding, the lower inner surface of the case 110 and the lower connection member 140 may be simultaneously coupled to each other, thereby facilitating assembly.

Meanwhile, in addition to the laser welding coupling, the lower cover terminal 160 is provided with a fastening member insertion groove 161 to fasten the fastening member 195 to be fastened to the lower electrode lead, and the lower cover terminal 160. ) May be more firmly coupled in a fastening manner to the fastening member insertion groove 161 of the fastening member 195.

An upper connection member 150 is connected to an upper end of the electrode winding body 130, and the upper connection member 150 is bent such that an edge 151 covers an upper edge of the electrode winding body 130. In more detail, an upper electrode lead portion (not shown) formed of an aluminum foil material is connected to an upper end of the electrode winding body 130, and the upper connection member 150 is entirely connected to the upper electrode lead portion. It is connected to cover, and the edge portion of the upper connection member 150 is connected as surrounding the edge of the upper electrode lead portion.

A locking rib 111 is formed at an upper end of the case 110 corresponding to the upper side of the upper connection member 150 to protrude inward. The locking rib 111 has an edge of the upper cover terminal 170 that is locked so that the edge of the upper cover terminal 170 is spaced from the edge of the upper electrode lead portion by a predetermined interval to store the electrolyte storage unit 290 ) To form a role. The electrolyte storage unit 290 is a place where the internal electrolyte is collected, especially when the electrolyte storage unit 290 is positioned downward when configuring the module, the electrolyte inside the cell through the discharge hole 175 It provides a space for the internal electrolyte to accumulate so as not to be discharged to the outside.

Meanwhile, as shown in FIG. 3, the upper cover terminal 170 is engaged with the locking rib 111 through a sealing 180 provided to surround the edge of the upper cover terminal 170. The sealing 180 is hereinafter referred to as a “second sealing 180” in order to distinguish it from the sealing 260 provided in the active gas discharge terminal 200 described later.

The second sealing 180 is interposed between the inner circumferential surface of the case 110 and the upper cover terminal 170 to prevent the gas generated inside the case 110 from leaking to a portion outside the discharge hole 175. It serves to prevent.

On the other hand, the upper cover terminal 170 is formed with an installation hole (not shown) in which the center portion is recessed downward so that the active gas discharge terminal 200 is installed. The discharge hole 175 is formed at the bottom of the installation hole, and the lower surface of the installation hole is coupled to be in close contact with the upper surface of the upper connection member 150.

As described above, the edge of the upper cover terminal 170 is spaced apart from the edge of the upper connection member 150 by a predetermined interval, and the electrolyte storage part 290 is formed outside the installation hole. . That is, an electrolyte storage unit 290 is formed between the upper cover terminal 170 and the electrode winding body 130 with the installation hole therebetween.

The upper end of the case 110 is formed inwardly to surround the upper end of the second sealing 180 to firmly couple the upper cover terminal 170. And, the bottom of the installation hole in close contact with the upper surface of the upper connecting member 150 of the upper cover terminal 170 is laser welded using the laser welding machine 190, as shown in FIG.

On the other hand, the installation hole is provided with an active gas discharge terminal 200.

As shown in FIGS. 4 and 5, the active gas discharge terminal 200 is fixed to cover the discharge hole 175 on the outer side of the upper cover terminal 170 in which the discharge hole 175 is formed. And a coupling terminal 210 having a discharge gas discharge hole 215 for guiding the gas discharged from the discharge hole 175 to the outside, and discharged from the discharge hole 175 to the discharge gas discharge hole 215. And a plunger 220 movably disposed by a gas.

Here, the coupling terminal 210, the lower end is inserted into the installation hole, a screw thread 171 is formed to be coupled in a screw coupling manner, the discharge gas discharge hole 215 to communicate with the discharge hole 175. It is formed to penetrate up and down in the middle.

In addition, the coupling terminal 210 is formed with a flange portion 211 for supporting a portion of the upper surface of the upper cover terminal 170 corresponding to the edge of the installation hole. A lower surface of the flange portion 211 is formed so as to be interviewed on a portion of the upper surface of the upper cover terminal 170.

A first seal 260 distinguished from the second seal 180 is interposed in an inner edge portion formed by the flange portion 211 and the lower end of the coupling terminal 210.

In more detail, the first sealing 260 is interposed at an inner edge portion formed by the lower end of the flange portion 211 and the coupling terminal 210 to form the coupling terminal 210 and the upper cover terminal. The gap between the 170 serves to prevent the leakage of gas.

A seating groove in which the first seal 260 is seated may be formed in the upper cover terminal 170. The seating groove is formed of a stepped portion 172 formed perpendicular to the upper surface of the upper cover terminal 170 and a stepped portion 173 formed horizontally orthogonal to the installation hole. The predetermined space in which the seal 260 is seated is formed.

A portion of the lower surface of the flange portion 211 corresponding to the outside of the first sealing 260 is a stepped portion of the upper cover terminal 170 when screwing the coupling terminal 210 to the installation hole ( An inclined portion 213 is formed to push the 172 and 173 outward. In more detail, the inclined portion 213 is formed to be inclined to contact an edge of the stepped portion 172 formed perpendicular to the upper surface of the upper cover terminal 170 among the stepped

portions

172 and 173, When the coupling terminal 210 is screwed into the installation hole, the inclined portion 213 contacts the stepped portion 211 while the coupling terminal 210 gradually moves downward. Then, the sealing effect of preventing the leakage of gas by the contact of the stepped portion 172 and the inclined portion 173 in addition to the first sealing 260 can be created.

On the other hand, the plunger 220 in the discharge gas discharge hole 215 is provided to be movable by the pressure of the gas generated and accumulated in the case 110.

More specifically, the discharge gas discharge hole 215 is formed to have a circular horizontal cross section having a predetermined inner diameter. The lower end of the discharge gas discharge hole 215 is in communication with the discharge hole 175 so as not to leak the gas between the coupling terminal 210 and the gap of the installation hole to be in contact with the upper edge of the discharge hole 175 Is installed. In addition, the lower end of the discharge gas discharge hole 215 guides the gas discharged through the discharge hole 175 to be smaller than the inner diameter of the discharge gas discharge hole 215 to the discharge gas discharge hole 215. The hole 217 is formed to engage the lower end of the plunger 220.

Meanwhile. The plunger 220 is formed to have a size that is inserted into the discharge gas discharge hole 215, and is approximately hexagonal so that gas flows between an inner surface of the discharge gas discharge hole 215 and an outer surface of the plunger 220. It is formed into a polygon with a horizontal cross section.

However, the plunger 220 is not necessarily formed as a polygon having a hexagonal horizontal cross section, and a separate gas discharge path (not shown) is formed between the outer circumferential surface of the plunger 220 and the discharge gas discharge hole 215. ) May be formed to have a circular cross section inserted into the discharge gas discharge hole 215 as long as it is formed.

In addition, the plunger 220 is elastically supported by the discharge gas discharge hole 215. In more detail, the upper end of the discharge gas discharge hole 215 is provided with an elastic member supporter 230 having a communication hole 231 smaller than the inner diameter of the discharge gas discharge hole 215. An elastic member 240 is disposed between the plunger 220 and the elastic member supporter 230 to elastically support the plunger 220 toward the guide hole 217. The elastic member 240 may be a spring. However, the elastic member 240 is not necessarily limited to the spring spring, it is a natural concept to include all the means for elastically supporting the plunger 220 toward the guide hole 217.

Between the plunger 220 and the guide hole 217 is provided with a guide hole opening and closing member 250 which is interlocked with the plunger 220 and covers the upper end of the guide hole 217. The guide hole opening and closing member 250 covers the guide hole 217 and the inside of the case 110 when the plunger 220 is elastically supported by the elastic member 240 toward the guide hole 217. In addition to preventing the leakage of the generated gas, the gas generated in the case 110 accumulates and the pressure of the gas exceeds the elastic force of the elastic member 240 by the internal pressure of the gas The gas is discharged while being spaced apart from the guide hole 217. The guide hole opening and closing member 250 is preferably formed of a rubber material.

Briefly explaining the operation of the electrical energy storage device according to the present invention configured as described above are as follows.

First, when gas is generated in the case 110, the pressure inside the case 110 increases, and the guide hole opening and closing member 250 covering the guide hole 217 is increased by the increased pressure. It is spaced apart from the guide hole 217 while pushing upward.

When the guide hole opening and closing member 250 is spaced apart from the guide hole 217, the plunger 220 is moved upward from the discharge gas discharge hole 215, and is larger than the elastic force of the elastic member 240. The gas is discharged between the inner surface of the discharge gas discharge hole 215 and the outer surface of the plunger 220 until the internal pressure of the case 110 decreases. This is because, as described above, the plunger 220 is formed into a polygon inserted into the discharge gas discharge hole 215, and a space is formed between the plunger 220 and the discharge gas discharge hole 215.

The gas discharged in this way is finally discharged to the outside through the communication hole 231 formed in the elastic member supporter 230.

Meanwhile, since the gas generated inside the case 110 is prevented from leaking by the first sealing 260 and the second sealing 180, the gas generated inside the case 110 may be prevented from leaking. The internal pressure is normally raised, and the gas is discharged by the active gas discharge terminal unit 200 in conjunction with the pressure increase inside the case 110, thereby preventing damage to the case 110. Of course, since there is no need to provide a separate gas accumulation space, there is an advantage that can achieve a miniaturization of the product.

On the other hand, Figure 6 is a cross-sectional view showing another embodiment of the electrical energy storage device of the present invention.

Another embodiment of the electrical energy storage device according to the present invention, in comparison with the preferred embodiment described above, almost all configurations are the same, but the lower cover terminal 160 and the coupling terminal for supplying power to the outside substantially It characterized in that the 310 has a shape more protruding in the longitudinal direction of the case (110).

In another embodiment of the electrical energy storage device of the present invention, as shown in FIG. 6, the coupling terminal 310 is provided such that the guide hole 217 is spaced to some extent without contacting the discharge hole 175. The storage unit 390B may be formed between the discharge hole 175 and the guide hole 217.

In addition, a central portion of the lower cover terminal 160 protrudes a predetermined length downward, and the protruding portion constitutes a storage unit 390C in which gas generated in the case 110 is stored.

For convenience of understanding, the storage unit formed between the discharge hole 175 and the guide hole 217 is defined as a first gas storage unit 390B, and the storage unit formed in the lower cover terminal 160 has a second gas. The storage unit 390C is defined.

According to another embodiment of the electrical energy storage device of the present invention, the first gas storage unit 390B and the second gas storage unit 390C is provided, the volume of the product is increased, but the lower cover as necessary By further protruding the terminal 160 and the coupling terminal 210 in the vertical direction, there is a useful advantage to more actively correspond to the pressure caused by the accumulation of gas in the case 110.

The embodiments of the electrical energy storage device according to the present invention have been described in detail with reference to the accompanying drawings. However, the embodiment of the present invention is not necessarily limited to the above-described preferred embodiment, and it is natural that various modifications and equivalents can be made by those skilled in the art to which the present invention pertains. something to do. Therefore, the true scope of the present invention will be defined by the claims to be described later.

According to the present invention, by actively discharging the gas to the outside of the case in response to the pressure inside the case it is possible to manufacture an electrical energy storage device that can prevent the breakage of the case and improve the endurance life.

Claims

A cylindrical case having an upper portion and an lower portion opened to receive the electrode winding body;

A lower cover terminal positioned below the case and configured to collect at least one of a positive electrode and a negative electrode from the electrode winding;

An upper cover terminal coupled to the opened upper portion of the case, collecting the other polarity from the electrode winding body, and having a discharge hole through which gas generated in the case is discharged;

It is coupled to the upper cover terminal and includes an active gas discharge terminal for automatically opening or closing the discharge hole in response to the internal pressure of the case by the gas,

The active gas discharge terminal unit,

A coupling terminal fixed to an outer side of the upper cover terminal in which the discharge hole is formed to cover the discharge hole, and having a discharge gas discharge hole guiding gas discharged from the discharge hole to the outside;

And a plunger disposed in the discharge gas discharge hole so as to be movable by the gas discharged from the discharge hole,

And the gas is discharged to the discharge gas discharge hole when the plunger moves.
The method according to claim 1,

And the plunger is elastically supported in the discharge gas discharge hole.
The method according to claim 2,

A lower end of the discharge gas discharge hole is formed with a guide hole smaller than the inner diameter of the discharge gas discharge hole, the upper end of the discharge gas discharge hole is provided with an elastic member supporter having a communication hole smaller than the inner diameter of the discharge gas discharge hole,

The plunger is an electrical energy storage device is elastically supported by an elastic member provided between the plunger and the elastic member supporter.
The method according to claim 3,

An electric energy storage device having a guide hole opening and closing member interlocked with the plunger and covering the upper end of the guide hole between the plunger and the guide hole.
The method according to claim 4,

The guide hole opening and closing member is an electrical energy storage device made of rubber.
The method according to claim 1,

The discharge gas discharge hole is formed in a circular shape, the plunger is formed in a polygonal electrical energy storage device.
The method according to claim 1,

The discharge gas discharge hole is formed in a circular shape, the plunger is formed in a circular shape to be inserted into the discharge gas discharge hole, the gas discharge path is formed between the discharge gas discharge hole and the gas discharge device.
The method according to claim 1,

In the center of the upper surface of the upper cover terminal is formed an installation hole to which the lower end of the coupling terminal is coupled,

The coupling terminal is screwed into the installation hole electrical energy storage device.
The method according to claim 8,

The coupling terminal is provided with a flange portion for supporting a portion of the upper surface of the upper cover terminal corresponding to the edge of the installation hole,

An electrical energy storage device having a first sealing interposed between the flange portion and the upper cover terminal.
The method according to claim 9,

And an inclined portion in the flange portion corresponding to an outer side of the first sealing to press a step portion formed in the coupling terminal when the coupling terminal is screwed into the installation hole.
The method according to claim 1,

A locking rib is formed at an upper end of the case so as to protrude inward.

And the upper cover terminal is coupled to the case so as to be caught on an upper end of the locking rib through a second seal surrounding the edge of the upper cover terminal.
The method according to claim 11,

And an upper end of the case is formed inwardly to surround the upper end of the second sealing.
The method according to claim 8,

And an electrolyte storage portion formed between the upper cover terminal and the electrode winding body with the installation hole interposed therebetween.
The method according to claim 3,

An electrical energy storage device formed between the discharge hole and the guide hole a first gas storage unit for storing the gas.
The method according to claim 1,

An electrode lead portion of an aluminum material is further provided between the lower cover terminal and the electrode winding body.

And the lower cover terminal, the electrode lead part, and the lower end of the case are welded to each other by laser welding.