KR20080035801A - Electric energy storage device and method of manufacturing the same - Google Patents

Abstract

An electric energy storage device, and a method for preparing the electric energy storage device are provided to improve the sealing property of a container and to prevent the separation of the welding part of a terminal plate and an electrode wound body. An electric energy storage device comprises an electrode wound body(100) which comprises a positive electrode, a negative electrode and a separator and is provided with an electrolyte solution provided between the positive electrode and the negative electrode; a container which accommodates the electrode wound body and has an open upper part at the upper part and an electrolyte solution injection hole at the bottom part; and a terminal plate which is connected with the open upper part to seal the container, and is provided with a vibration preventing member(345) and positive electrode and negative electrode terminals(310,320) for connecting electrically an external resistor and the electrode wound body.

Description

Electric energy storage device and method of manufacturing the same

Figure 1a is a perspective view showing a cylindrical electrical energy storage device according to the prior art.

FIG. 1B is a plan view illustrating the cylindrical electrical energy storage device shown in FIG. 1A.

FIG. 1C is a cross-sectional view of the cylindrical electrical energy storage device shown in FIG. 1A taken along the line II ′.

FIG. 2 is a plan view of an electrode winding included in the conventional cylindrical electrical energy storage device shown in FIG. 1A.

 3 is a view illustrating a process of filling an electrolyte into a conventional electric energy storage device.

4 is a perspective view showing the electrical energy storage device according to an embodiment of the present invention.

5A and 5B are plan and bottom views of the electrical energy storage device shown in FIG. 4.

6A and 6B are cross-sectional views taken along line III-III 'and IV-IV' of the electric energy storage device shown in FIG.

FIG. 7A is an enlarged cross-sectional view of the bottom plate of the electrical energy storage device shown in FIG. 6A.

FIG. 7B is an enlarged cross-sectional view illustrating an enlarged portion A of FIG. 7A.

FIG. 8 is a cross-sectional view of the closure shown in FIG. 7A. FIG.

9 is a front perspective view for explaining a terminal plate according to an embodiment of the present invention.

FIG. 10 is a rear perspective view of the terminal plate shown in FIG. 9.

FIG. 11 is an exploded perspective view of the terminal plate shown in FIG. 9.

12 is a perspective view showing a vibration preventing member according to an embodiment of the present invention.

13 is a flowchart illustrating a method of manufacturing an electrical energy storage device according to an embodiment of the present invention.

14 is a flowchart illustrating a terminal plate forming step illustrated in FIG. 13.

15 is a conceptual diagram illustrating a method of injecting an electrolyte solution according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: electrode winding 110: winding element

120: Attention 200: Courage

210: wall 220: bottom plate

222: second protrusion 224: airtight

300: terminal plate 310: positive terminal

320: negative electrode terminal 330: the first coupling member

340: second coupling member 344: first protrusion

345: anti-vibration member

The present invention relates to an electric energy storage device and a manufacturing method thereof, and more particularly, to a cylindrical electric energy storage device and a method for manufacturing the same that can suppress the relative movement of the upper plate and the winding body and shorten the injection time of the electrolyte. .

Compared with a discharge-only primary battery, a secondary battery that can be charged and discharged like a capacitor has a higher resistance and efficiency than a secondary battery according to a method of connecting a terminal for electrically connecting an internal current source and an external resistor. Not only is it affected, but also the productivity of the secondary battery itself and the user's convenience of using it. 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.

Figure 1a is a perspective view showing a cylindrical electrical energy storage device according to the prior art, Figure 1b is a plan view showing the cylindrical electrical energy storage device shown in Figure 1a. FIG. 1C is a cross-sectional view of the cylindrical electrical energy storage device shown in FIG. 1A taken along the line II ′. FIG. 2 is a plan view of an electrode winding included in the conventional cylindrical electrical energy storage device shown in FIG. 1A.

1A to 1C and FIG. 2, a conventional cylindrical electrical energy storage device 90 includes an electrode winding 10 and an electrode winding 10 that generate charge transfer by oxidation and reduction with an electrolyte. ) And a container 30 for electrically connecting the terminal plate 20 to the external resistor and the terminal plate 20 to the electrode winding body 10 and sealing the electrolyte and the electrode winding body 10 from the outside. do.

The electrode winding 10 physically separates the cathode 16 which generates electrons by an oxidation reaction, the anode 18 which absorbs the generated electrons, and undergoes a reduction reaction, and the cathode 16 and the anode 18. In order to isolate the place where the oxidation reaction and the reduction reaction occur, the separator 14 which functions as an electrode which is separated from each other is wound in turn around the winding core 12 to form an overall cylindrical shape. At one end of the winding body 10, a plurality of positive electrode leads A formed by the positive electrode current collector and a plurality of negative electrode leads B formed by the negative electrode current collector are separated and protrude, and have a cylindrical shape as a whole.

The terminal plate 20 includes positive and negative terminals 24 and 28, and positive and negative connection plates 22 for connecting the positive lead A and the negative lead B to the positive and negative terminals 24 and 28. , 26) and a coupling member 21 to which the positive and negative terminals and the positive and negative connection plates are fixed. The positive electrode connecting plate 22 is in contact with the positive electrode lead A by the positive electrode lead connecting part 22a, and the negative electrode connecting plate 26 is connected to the negative electrode lead B by the negative electrode lead connecting part 26a. Contact.

The positive and negative electrode connecting plates 22 and 26 have a disc shape in which body, lead connecting parts 22a and 26a and terminals 24 and 28 are integrally formed. The positive and negative electrode connecting plates 22 and 26 are integrally manufactured by die casting, casting, or the like, or welding the lead connecting parts 22a and 26a and the positive and negative terminals 24 and 28 to the body. It may be bonded by soldering, or brazing. A protruding portion 21a is formed at the center of the terminal plate 20 to be inserted into the core 12 when the battery is manufactured to hold the connection plates 22 and 26.

The container 30 has a cylindrical shape with one end open and accommodates the electrode wound body 10 therein. After accommodating the electrode winding body 10, the terminal plate 20 is fixed to seal the container 30 so that the leads A and B formed at the upper end of the electrode winding body come into contact with the lead connecting portions 22a and 26a. . At this time, a sealing material 29 such as rubber may be used to increase the sealing effect. As the container 30, a metal material such as aluminum, stainless steel, or tin plated steel may be used, or a resin material such as PE, PP, PPS, PEEK, PTFE, or ESD may be used. The material of the container 30 is used differently depending on the type of electrolyte.

The electrode winding body 10 is accommodated inside the container 30 and sealed with the terminal plate 20, and then the electrolyte is injected into the container 30 through the injection hole H, thereby providing a conventional electric energy storage device ( Complete 90).

However, the conventional electrical energy storage device 90 as described above has the following problems.

When the electrical energy storage device is operated, an active oxidation source action occurs inside the vessel 30 and gas is generated as a by-product thereof to increase the pressure in the vessel. Due to the increased pressure, a space is generated inside the container in the vertical direction, and the electrode winding body 10 flows along the space. In particular, when the lead connecting portions 22a and 26a are not fixed with sufficient adhesive strength during welding or soldering, the gap in the upper direction of the container is further increased to increase the flow of the electrode winding 10. The flow of the electrode winding 10 causes a problem of contact between the leads A and B and the lead connecting portions 22a and 26a, thereby raising the overall electrical resistance.

On the other hand, the position of the injection hole (H) is located in the upper portion of the electrode winding 10 there is a problem to increase the electrolyte supply time. 3 is a view illustrating a process of filling an electrolyte into a conventional electric energy storage device.

As shown in FIG. 3, an injection hose 60 penetrating through the injection hole H is connected, and an electrolyte 61 is injected into the container 30 through an injection hose. At this time, since the injection hole (H) is located at the upper end of the peripheral portion of the disc-shaped terminal plate 20, the electrolyte is supplied to the upper peripheral portion of the cylindrical electrode winding (10). At this time, since the inside of the container 30 is formed as a sealed space, when the electrolyte 61 is injected, the gas (eg, air) existing in the inside of the container 30 is pushed by the electrolyte 61 and the container 30. It is discharged to the outside through an outlet (not shown) formed in the bottom portion (B) of.

However, since the electrolyte 61 is supplied from the upper portion of the electrode winding 10, the side wall and the electrode of the container 30 before the central portion C of the electrode winding 10 is sufficiently submerged by the electrolyte 61. It flows downward through the gaps between the winding bodies 10 and collects on the bottom portion B of the container 30 so that the outlet port is blocked by the electrolyte solution. When the injection of the electrolyte is continued to completely impregnate the electrolyte to the center C of the electrode winding 10, the internal gas located at the center C of the electrode winding 10 is the bottom of the container 30. After being pushed to there is a problem that is discharged after melting in the form of bubbles inside the electrolyte blocking the outlet. Accordingly, since the electrolyte must be supplied while completely discharging the bubbles generated by the internal gas, the electrolyte supply time becomes long, thereby reducing the overall production efficiency.

The first object of the present invention for solving the above problems is to provide an electrical energy storage device that can suppress the relative movement of the electrode winding in the container and reduce the supply time of the electrolyte.

It is a second object of the present invention to provide a method of manufacturing such an electrical energy storage device.

In order to achieve the first object of the present invention, the electric energy storage device according to the present invention includes an electrode winding body, a container, and a terminal plate.

The electrode winding body is wound around a core in order of an anode that generates electrons according to a redox reaction, an anode that absorbs the generated electrons, and an isolation film that physically isolates the anode and the cathode, and is located between the anode and the cathode. It includes an electrolyte solution provided in. The container includes an injection hole for receiving the electrode winding body, the upper end is opened and the lower part is injected with the electrolyte solution. The terminal plate is connected to an open upper end of the container to seal the container, and is pressed against an inner surface of the core to prevent the flow of the electrode winding body with the vibration preventing member and an external resistor and the electrode winding body. It is provided with a positive and negative terminal for connecting.

In one embodiment, the core has a cylindrical shape formed of aluminum. The container includes a bottom plate having a bottom projection protruding from the surface into the interior of the core, and the inlet communicates with the interior of the core through the bottom projection and maintains an airtightness within the container. Include.

In one embodiment, the closure includes a bolt that is screwed into the inlet. The bolt has a thread formed on the surface thereof and includes a tab portion screwed with the injection hole and a head portion integrally formed with the tab portion and having an inclined surface inclined by a predetermined angle with respect to the surface of the bottom plate. An edge of the bottom plate contacting the head along the inclined direction of the inclined surface is obliquely compressed.

In an embodiment, the terminal plate may have a positive electrode connecting plate electrically connected to the positive electrode and a positive electrode terminal opposite the positive electrode connecting part, a negative electrode connecting part electrically connected to the negative electrode of the electrode, and opposite the negative electrode connecting part. A negative electrode connecting plate having a negative electrode terminal, a coupling member surrounding the positive electrode connecting plate and the negative electrode connecting plate to expose the positive and negative electrode connecting parts and the terminals, and insulating the positive electrode connecting plate and the negative electrode connecting plate, and the coupling member And a top plate protrusion protruding from the surface of the core to be inserted into the inside of the winding core, wherein the vibration preventing member is positioned at an end portion of the top plate protrusion.

In one embodiment, the anti-vibration member includes a threaded fastener screwed into the top plate protrusion. The fastener includes a body portion screwed to the upper plate protrusion, and a wing portion formed radially and having an elastic body with a predetermined inclination toward the upper portion of the core from the body portion.

In one embodiment, the coupling member has a first accommodating hole for accommodating the positive electrode connecting portion and a second accommodating hole for accommodating the negative electrode connecting portion, and is coupled to one side of the positive electrode connecting plate and the negative electrode connecting plate. A second coupling member having a first coupling member, a third accommodation hole for accommodating the positive electrode terminal, and a fourth accommodation hole for accommodating the negative electrode terminal, and coupled to the other side surfaces of the positive and negative connection plates; Include. The first coupling member and the second coupling member are integrally formed by welding by ultrasonic waves, and the terminal plate is injection molded along the circumferences of the positive and negative connection plates, respectively, and is sealed to prevent leakage of the electrolyte solution. The member further includes.

Disclosed is a method of manufacturing an electrical energy storage device according to the present invention in order to achieve the second object of the present invention. A cathode that generates electrons according to a redox reaction, a cathode that absorbs the generated electrons, and a separator that physically isolates the anode and the cathode includes a winding device wound around the core in order, and between the anode and the cathode. The electrode winding body provided with the electrolyte solution provided in this is formed. A terminal plate is formed on the inner surface of the winding core and includes a vibration preventing member that prevents flow with the electrode winding body and an anode terminal and a cathode terminal electrically connecting the external resistor and the electrode winding body. The electrode winding body is inserted into a container having an injection hole for injecting the electrolyte solution into the bottom. The positive and negative terminals of the terminal plate couple the terminal plate to be electrically connected to the positive and negative electrodes, respectively. The electrolyte solution is injected into the inlet to sequentially fill the electrolyte solution from the region near the terminal plate of the container toward the bottom of the container.

In an embodiment, to form the terminal plate, a positive electrode connecting portion electrically connected to the positive electrode and a positive electrode connecting plate having the positive electrode terminal facing the positive electrode connecting portion are formed, and a negative electrode connecting portion electrically connected to the negative electrode and the negative electrode connecting portion. Preparing a negative electrode connecting plate on which the negative electrode terminal facing the second electrode; and a coupling member for insulating the positive electrode connecting plate and the negative electrode connecting plate to insulate the positive electrode connecting plate and the negative electrode connecting plate to expose the connecting parts and the terminals. Form. Subsequently, the vibration preventing member is inserted into the winding core and pressed against the inner surface of the winding core to prevent the flow of the electrode winding body.

In one embodiment, the upper plate protrusion is formed on the lower surface of the coupling member and the anti-vibration member is screwed to the upper plate protrusion. At this time, the step of coupling the terminal plate includes the step of inserting the upper plate projecting portion into the inside of the core, the vibration preventing member is pressed against the inner surface of the core inclined obliquely to the resistance during the celebration toward the lower portion of the core It does not produce, but creates resistance to congratulations towards the top of the core. In one embodiment, the resistance is proportional to the elastic force of the anti-vibration member. Joining the container and the terminal plate may be performed by welding or seaming.

In an embodiment, the bottom protrusion further protrudes into the core in the center of the bottom portion, and the injection hole communicates with the inside of the core through the bottom protrusion. In this case, in order to inject the electrolyte solution, first, the container is turned upside down so that the terminal plate faces the bottom and the bottom portion faces the top. Subsequently, an injection hose having a width smaller than the diameter of the injection hole is inserted into the injection hole, and the electrolyte solution is supplied into the core through the injection hose.

The electrolyte solution supplied into the core is filled from the adjacent region of the terminal plate and the electrode winding body to fill the winding element from the terminal plate toward the bottom plate, and is filled in the container during the supply of the electrolyte solution. The internal gas which is already present in is discharged to the outside of the container through the gap between the injection port and the injection hose.

In one embodiment, after the injection of the electrolyte solution is completed, the injection port is closed to seal the inside of the container from the outside. Closing the inlet is performed by a bolt that is screwed into the inlet. In this case, the bolt includes a tab portion coupled to the injection hole and the head portion formed integrally with the tab portion, the bottom surface of the head portion includes an inclined surface inclined by a predetermined inclination angle with respect to the surface of the bottom plate, The corner portion is pressed by the inclined surface and is formed to be inclined at the same inclination angle as the inclined surface.

According to the present invention configured as described above, the vibration prevention member of the elastic body is formed on the protrusion of the terminal plate inserted into the core and pressed against the inner surface of the core to thereby increase the internal pressure or the vibration from the outside according to the driving of the electric energy storage device. The welding part of the electrode winding body and the terminal plate can be prevented from coming off. Therefore, the electrical stability of the electrical energy storage device can be increased. In addition, there is an advantage that the injection time of the electrolyte solution can be shortened by injecting the electrolyte solution through the bottom plate to facilitate the discharge of the gas inside the container.

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

4 is a perspective view showing the electrical energy storage device according to an embodiment of the present invention. 5A and 5B are plan and bottom views of the electrical energy storage device shown in FIG. 4. 6A and 6B are cross-sectional views taken along line III-III 'and IV-IV' of the electric energy storage device shown in FIG.

4, 5a, 5b, 6a and 6b, the electrical energy storage device 900 according to an embodiment of the present invention is the electrode winding body 100, the container 200 for receiving the electrode winding body 100 And a terminal plate 300 electrically connected to the electrode winding body 100 and sealing the container 200.

The electrode winding 100 generates a current through charge transfer by oxidation and reduction with the electrolyte. In one embodiment, the electrode winding 100 is a cathode (not shown) that generates electrons by an oxidation reaction, an anode (not shown) that absorbs the generated electrons to cause a reduction reaction, and physically between the cathode and the anode Winding device (110) including a separator that separates the place where the oxidation and reduction reaction occurs by separating and functioning as electrodes that are separated from each other and a hollow shaft in which the winding device (110) is wound along the surface Wind core 120. Accordingly, the electrode winding body 100 has a cylindrical shape in which the winding elements 110 are arranged along the core, and a plurality of positive electrode leads formed by a positive electrode current collector at one end of the winding element 110 (not shown). And a plurality of negative electrode leads formed by the negative electrode current collector are separated and protrude.

Since the positive and negative leads are formed only on one side, the winding device 110 is more convenient when the leads are formed on both sides when a cable is connected to the terminal or connected in series or in parallel. If the terminal is in one direction, the bus bar can be easily installed after the electrical energy storage device is inserted into the case in series or parallel connection, and the volume increase of the case can be minimized because the bus bar is present on only one side. . In addition, when using a balancing circuit for voltage equalization in series connection, it is convenient to use a method of positioning the balancing circuit on the bus rock and fixing it with screws when the terminal is in one direction.

The core 120 may be formed of a plastic or metal material. In particular, since metal is superior in hardness in terms of hardness, it is advantageous to form a vibration preventing member as described later in the core 120.

In one embodiment, the winding core 120 may be formed of a hollow shaft formed of aluminum to increase the resistance to the axial load. When the axial load acts according to the increase in the internal pressure generated when the electric energy storage device is driven, the internal stress against the axial load may be increased when the electrical energy storage device is formed of metal rather than plastic. Therefore, the occurrence of play between the winding element 110 and the terminal plate 300 or the winding element 110 and the container 200 due to the increase in the internal pressure of the electrical energy storage device by driving can be suppressed.

The container 200 includes a sidewall 210 and a bottom plate 220 having a cylindrical shape having an open top to accommodate the electrode winding 100.

The inner volume of the container 200 is defined by the sidewalls and the bottom plate, and a first protrusion 222 protruding into the inner space of the container in correspondence with the core 120 at the center of the bottom plate 220. Is formed. The first protrusion 222 is formed to correspond to the core 120. Therefore, when the electrode winding body 100 is inserted into the container 200, the electrode winding inside the container 200 by inserting the first protrusion 222 into the core 120. The position of the collecting body 100 can be accurately derived.

In one embodiment, the side wall 210 and the bottom plate 220 may use a metal material, such as stainless steel or tin-plated steel, depending on the type of electrolyte used, PE, PP, PPS, PEEK, PTFE, etc. A resin material can also be used. For example, when chemical resistance is required for the electrical energy storage device 300 using an electrolyte solution, PE and PP are excellent in acid and base resistance, and are suitable as a material for the container 320, and among the metals, stainless steel is used. Partially stable In the case of the electrical energy storage device 300 using the organic electrolyte, the material of the container is aluminum in terms of price, chemical resistance, weight, processability in the case of metal, PE, PP in the case of plastic shows excellent chemical resistance .

The first protrusion 222 includes an injection hole H and a closure 224. An electrolyte solution for promoting charge transfer between the positive electrode and the negative electrode is supplied into the container 100 through the injection hole H. At this time, as described later, the gas inside the container generated during the injection process of the electrolyte solution is also efficiently discharged through the injection hole H, thereby significantly shortening the supply time of the electrolyte solution. When the injection of the electrolyte is completed, the container 200 is closed by using the sealer 224 to isolate the container 200 from the outside and maintain the airtightness therein.

In one embodiment, the closure 224 includes a bolt screwed with the inlet (H). FIG. 7A is an enlarged cross-sectional view of a bottom plate of the electrical energy storage device shown in FIG. 6A, and FIG. 7B is an enlarged cross-sectional view of an enlarged portion A of FIG. 7A. FIG. 8 is a cross-sectional view of the closure shown in FIG. 7A. FIG.

7A, 7B, and 8, the bolt 224 disclosed in one embodiment of the closure 224 includes a tab portion 224a and a head portion 224b, the head portion 224b having a bottom surface. A part includes an inclined portion I formed to be inclined with the stepped surface of the first protrusion 222. Therefore, the bottom surface of the head 224b has a two-stage structure that is separated from each other with respect to the inclined portion I.

The inclined portion I serves to improve the airtightness of the container when fastened to the injection hole (H). When the bolt 224 is screwed into the injection hole H, the edge portion C of the bottom plate 220 formed around the injection hole H contacts the inclined portion I as shown in FIG. 7B. Is pressed along the inclined surface. Therefore, the airtightness of the container is enhanced by the compression of the bolt 224 and the bottom plate 220, thereby sufficiently preventing the leakage of the electrolyte through the injection hole (H). Preferably, an O-ring may be interposed at the lower end of the head 224b to enhance the fastening force of the bolt 224 and further improve the airtightness of the container.

9 is a front perspective view for explaining a terminal plate according to an embodiment of the present invention. FIG. 10 is a rear perspective view of the terminal plate illustrated in FIG. 9, and FIG. 11 is an exploded perspective view of the terminal plate illustrated in FIG. 9.

9 to 11, the terminal plate 300 includes a positive connection plate 310, a negative connection plate 320, a first coupling member 330, a second coupling member 340, and a sealing member 350. It includes.

The positive connecting plate 310 is composed of a positive connecting plate body 312, a positive lead connecting portion 314 and a positive terminal 116. The positive connection plate body 312 is in the form of a plate similar to the fan shape. The positive lead connecting portion 314 protrudes from an upper surface of the positive connecting plate body 312. The anode lead connecting portion 114 is in close contact with the anode lead extending from the anode of the electrode. The positive electrode terminal 316 is formed to protrude from a lower surface of the positive electrode connecting plate body 312. The positive electrode connecting plate 310 is integrally formed with the positive electrode connecting plate body 312, the positive lead connecting portion 314 and the positive electrode terminal 316. The positive electrode connecting plate 310 is integrally manufactured through die casting, casting, or the like, or welding or soldering the positive lead connecting portion 314 and the positive electrode terminal 316 to the positive electrode connecting plate body 312. Joining may be performed by soldering or brazing.

The negative connection plate 320 has a form symmetrical with the positive connection plate 310. The negative electrode connection plate 320 includes a negative electrode connection plate body 322, a negative electrode lead connection part 324, and a negative electrode terminal 326. The negative connection plate body 322 has a plate shape similar to a fan shape. The negative lead connecting portion 324 is formed to protrude from the upper surface of the negative connecting plate body 322. The negative lead connecting portion 324 is in close contact with the negative electrode lead extending from the negative electrode of the electrode. The negative electrode terminal 326 protrudes from a lower surface of the negative electrode connecting plate body 322. The negative electrode connecting plate 320 is integrally formed with a negative electrode connecting plate body 322, a negative electrode lead connecting portion 324, and a negative electrode terminal 326. The negative electrode connection plate 320 is integrally manufactured through die casting, casting, or the like, or welding or soldering the negative electrode lead connection part 324 and the negative electrode terminal 326 to the negative electrode connection plate body 322. Joining may be performed by soldering or brazing.

The positive electrode connecting plate 310 and the negative electrode connecting plate 320 are made of metal. Specifically, the material of the anode lead connecting portion 314 is the same series as the material of the anode of the electrode is used, the material of the cathode lead connecting portion 324 is preferably the same series as the material of the cathode of the electrode. Since the positive electrode terminal 316 and the negative electrode terminal 326 are not exposed to the electrolyte, mechanical and electrical characteristics should be considered when selecting materials rather than electrochemical stability. Therefore, a material that can be easily joined by a method such as welding, soldering, or brazing is preferable. In one embodiment, a copper alloy or an aluminum alloy having excellent mechanical properties and good electrical conductivity may be used as the terminals 316 and 326.

The first coupling member 330 has a disc shape and has a first groove 331 for accommodating the positive connection plate body 312 and a second groove for accommodating the negative connection plate body 322 on an upper surface thereof. 332 is formed. The first groove 331 is formed in a shape corresponding to the positive connection plate body 312, the second groove 332 is formed in a shape corresponding to the positive connection plate body 322. A third groove 333 is formed along the edge of the first groove 331. Similarly, a fourth groove 334 is formed along the edge of the second groove 332.

A first accommodating hole 335 for penetrating the top and bottom of the first coupling member 330 in the center portion of the first groove 331 and for accommodating the positive terminal 316 of the positive electrode connecting plate 310 is provided. Is formed. A second accommodating hole 336 is formed in the central portion of the second groove 332 to penetrate the upper and lower portions of the first coupling member 330 and to accommodate the negative terminal 326 of the negative connection plate 320. Is formed. A protrusion 337 is formed along an upper edge of the first coupling member 330. The protrusion 337 is used for coupling with the second coupling member 340.

On the other hand, one side of the first coupling member 330 is formed with a first hole 338 penetrating up and down. The first hole 338 is for fixing a safety piece, and a thread is formed on an inner surface thereof. The safety piece is broken at a pressure lower than the explosion pressure to prevent the energy storage device 900 from exploding due to the high pressure.

The second coupling member 340 is in the form of a disc, penetrates the top and bottom of the second coupling member 340 on one side, the third accommodating for accommodating the positive lead connecting portion 314 of the positive electrode connecting plate 310 The hole 341 is formed. The other side of the second coupling member 340 passes through the top and bottom of the second coupling member 340, the fourth receiving hole 342 for accommodating the negative lead connecting portion 324 of the negative electrode connecting plate 320 Is formed. The second coupling member 340 has a second hole 343 formed at a position corresponding to the first hole 338 of the first coupling member 330. Like the first hole 338, the second hole is for fixing a safety piece, and a thread is formed on an inner surface thereof.

A second protrusion 344 is formed at the center of the upper surface of the second coupling member 340. The second protrusion 344 is inserted into the core 120 of the electrode winding body 100 similarly to the first protrusion 222. Therefore, the second protrusion 344 allows the positive lead and the negative lead and the positive lead connecting portion 314 and the negative lead connecting portion 324 positioned on the winding device to be in close contact with each other.

The first coupling member 330 and the second coupling member 340 may be integrally formed. In order to form the first coupling member 330 and the second coupling member 340 integrally, ultrasonic welding is performed on the protrusions 337 of the first coupling member 330.

On the other hand, the vibration preventing member 345 having elasticity is located at the end of the second protrusion 344. 12 is a perspective view showing a vibration preventing member according to an embodiment of the present invention.

Referring to Figure 12, the vibration preventing member 345 according to an embodiment of the present invention includes a screw fastener (fastener). The threaded fastener has a thread formed on an inner side thereof, and is connected to the body portion 345a and the body portion 345a, which are screwed with the second protrusion 344, and the upper portion of the core 120 along an outer radial direction. It includes a wing portion 345b protruding obliquely. The area of the core 120 in close proximity to the terminal plate 300 is promised to the upper portion of the core, and the area of the core 120 in close proximity to the bottom plate 220 is promised to the bottom of the core. In particular, the fastener is formed of a material having excellent fatigue characteristics due to repeated loads, and the wing portion 345b is formed of a material having excellent elastic characteristics.

The fastener, which is the anti-vibration member 345, is formed such that the wing portion 345b is inclined toward the upper portion of the core 120, so that the second protrusion part is formed by an axial load applied downward of the core 120. 344 can be easily inserted into the core 120. However, once inserted, a strong friction force acts between the wing portion 345b and the inner surface of the winding core 120 by the elastic force of the wing portion 345b, even though an axial load is applied above the winding core. It does not come off easily.

Therefore, even if an axial load or external vibration is applied to the terminal plate 300 and the bottom plate 220 of the container due to the internal pressure increased by the driving of the electrical energy storage device 900, the electrode winding. Contact between the body 100 and the terminal plate 300 can be sufficiently maintained. Accordingly, there is an advantage in that the relative movement of the terminal plate 300 and the electrode winding body 100 can be suppressed to minimize an increase in the electrical resistance of the welded part.

The sealing member 350 is provided between the positive electrode connecting plate 310 and the first coupling member 330 and between the negative electrode connecting plate 320 and the first coupling member 330, respectively. Specifically, the sealing member 350 is provided in the third groove 333 and the fourth groove 334, respectively. Therefore, the sealing member 350 has a closed curve shape. Rubber is preferably used as the material of the sealing member 350. The sealing member 350 prevents the electrolyte from leaking between the positive electrode connecting plate 310 and the first coupling member 330 and between the negative electrode connecting plate 320 and the first coupling member 330. can do.

According to the electrical energy storage device according to the present invention, by forming an anti-vibration member of the elastic body in the protrusion of the terminal plate inserted into the core core and crimped to the inner surface of the core core, an increase in the internal pressure caused by the drive of the electrical energy storage device or from the outside The welding part of the electrode winding body and the terminal plate can be prevented from being separated from the vibration.

Hereinafter, a method of manufacturing the electrical energy storage device as described above will be described in detail.

13 is a flowchart illustrating a method of manufacturing an electrical energy storage device according to an embodiment of the present invention. 14 is a flowchart illustrating a terminal plate forming step illustrated in FIG. 13.

Referring to FIGS. 4 to 14, the cathode winding having the anode lead, the separator, and the cathode having the cathode lead are sequentially wound to form an electrode winding body 100. (Step S10) Anode and a cathode around the core 120. And it is wound in a cylindrical shape so that the separator is located between the anode and the cathode. At this time, the positive electrode lead and the negative electrode lead on one side of the electrode winding body 100 are wound in a state in which a part of the positive electrode and the negative electrode is formed in advance to extend.

The terminal plate 300 is manufactured separately from the electrode winding body 100. (Step S20) In one embodiment, the positive electrode connecting plate between the first coupling member 330 and the second coupling member 340 ( 310, the cathode connecting plate 320 and the sealing member 350 are disposed. (Step S210)

Specifically, the sealing member 350 is fitted into the third groove 333 and the fourth groove 334 formed on the upper surface of the first coupling member 330. Next, the body 312 of the positive connection plate 310 is fitted into the first groove 331 of the first coupling member 330. In this case, the positive terminal 316 is accommodated in the first receiving hole 335 of the first coupling member 330 to protrude downward from the first coupling member 330. Similarly, the body 322 of the negative electrode connecting plate 320 is fitted into the second groove 332 of the first coupling member 330. In this case, the negative terminal 326 is accommodated in the second receiving hole 336 of the first coupling member 330 to protrude downward from the first coupling member 330. Subsequently, the second coupling member 340 is fitted on the first coupling member 330 to surround the positive connection plate 310 and the negative connection plate 320. In this case, the positive lead connecting portion 314 of the positive connecting plate 310 is accommodated in the third receiving hole 341 of the second coupling member 340 to protrude upward from the second coupling member 340. Likewise, the negative lead connecting portion 324 of the negative connecting plate 320 is accommodated in the fourth receiving hole 342 of the second insulating coupling material 340 to protrude upward from the second coupling member 340.

As described above, when the first coupling member 330, the second coupling member 340, the positive connection plate 310, the negative connection plate 320, and the sealing member 350 are disposed, the first coupling member 330 is disposed. And the second coupling member 340. (Step S220) Ultrasonic wave is applied to the protrusion 337 formed along the upper surface edge of the first coupling member 330 to melt the protrusion 337. As the protrusion 337 is melted, the first coupling member 330 and the second coupling member 340 are integrated. That is, the first coupling member 330 and the second coupling member 340 are coupled by welding.

Subsequently, the vibration preventing member 345 is coupled to the end of the second protrusion 344. (Step S230) In one embodiment, the threaded fastener is screwed to the end of the second protrusion 344.

The electrode assembly 100 is inserted into the container 200. (S30)

The electrode winding body 100 is inserted through the opening of the container 200 so that the core 120 is fixed to the first protrusion 222 formed at the center of the bottom plate 220 of the container 200. At this time, the positive electrode lead and the negative electrode lead of the electrode winding body 100 are directed toward the opening of the container 200.

The terminal plate 300 is coupled to the container 200 into which the electrode winding body 100 is inserted.

The terminal plate 300 is fixed to the container 200 such that the positive lead connecting portion and the negative lead connecting portion of the terminal plate 300 closely contact the positive lead and the negative lead, respectively. The second protrusion 344 at the center of the terminal plate 330 fixes the core 120 of the electrode winding body 100 together with the first protrusion 222 to positive and negative leads and the cathode of the electrode winding body 100. A lead is maintained in close contact with the positive lead connecting portion and the negative lead connecting portion of the terminal plate 200, respectively. The terminal plate 300 and the container 200 may be coupled by various methods, such as welding and seaming. In the state in which the terminal plate 300 is fixed to the container 200, it is obvious that the airtightness of the container may be increased through the sealing means such as a rubber ring between the terminal plate 300 and the container 200.

The wing 345b of the anti-vibration member 345 is strongly pressed onto the inner surface of the winding core 120 to fix the position of the winding device 110. Therefore, even if external vibration is applied, contact failure between the terminal plate and the winding element can be prevented by the strong friction force formed between the wing portion and the inner surface of the winding core.

The electrolyte solution is injected into the container through the bottom plate. (Step S50) FIG. 15 is a conceptual diagram showing an electrolyte solution injection method according to an embodiment of the present invention.

Referring to FIG. 15, an injection hose 800 is inserted into an injection hole H formed in the first protrusion 224 to inject an electrolyte solution L into the container 200. Since the electrolyte solution is supplied while the bottom plate 220 is turned upside down, the supplied electrolyte solution is filled from the interface between the winding element and the terminal plate. At this time, the internal gas including the air present in the container is pushed toward the bottom plate by the electrolyte solution and the pushed out internal gas to the outside through the gap between the injection port (H) and the injection hose (800) Easily discharged Therefore, since the outlet of the internal gas can be prevented from being blocked by the electrolyte solution, the supply time of the electrolyte solution can be significantly reduced.

When the injection of the electrolyte solution is completed to seal the outlet (H) using a bolt to ensure the airtightness inside the container. At this time, as mentioned, by forming the bottom surface of the head of the bolt in a two-stage structure, it is possible to further improve the airtightness after the fastening.

Although not shown, a safety piece is provided in a hole formed to penetrate up and down on one side of the terminal plate 300. The safety piece has a thread formed on the outer surface to correspond to the thread formed on the inner surface of the hole, and has a hole in the longitudinal direction. The metal foil is mounted in the hole formed in the longitudinal direction to block the hole. The safety piece is to prevent the electrical energy storage device 300 from being exploded due to the high pressure, the metal foil is broken at a pressure lower than the explosion pressure.

According to the manufacturing method of the electric energy storage device according to the present invention, the electrolyte solution is filled from the interface between the winding element and the terminal plate toward the bottom plate by injecting the electrolyte solution from the bottom plate. Therefore, the internal gas which has already existed in the container can be smoothly discharged to the outside of the container through the injection port, thereby sufficiently shortening the electrolyte supply time.

As described above, according to the electrical energy storage device and a method of manufacturing the same according to a preferred embodiment of the present invention, by forming an anti-vibration member of the elastic body in the protrusion of the terminal plate inserted into the core core, the electrical energy storage by pressing the inner surface It is possible to prevent the welding portions of the electrode winding body and the terminal plate from deviating from an increase in internal pressure or vibration from the outside caused by driving of the device. Therefore, the electrical stability of the electrical energy storage device can be increased.

In addition, there is an advantage that the injection time of the electrolyte solution can be shortened by injecting the electrolyte solution through the bottom plate to facilitate the discharge of the gas inside the container.

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (26)

A positive electrode that generates electrons by a redox reaction, a negative electrode that absorbs the generated electrons, and a separator that physically separates the positive electrode and the negative electrode are wound around the core in order, and an electrolyte solution provided between the positive electrode and the negative electrode An electrode winding body provided; A container accommodating the electrode winding body and having an upper end portion and an inlet portion for injecting the electrolyte solution in a bottom portion thereof; And It is connected to the open upper end of the container to seal the container, and is pressed against the inner surface of the winding core to electrically connect the vibration preventing member and an external resistor and the electrode winding body to prevent flow with the electrode winding body Electrical energy storage device comprising a terminal plate having a positive electrode and a negative electrode terminal. The electrical energy storage device according to claim 1, wherein the winding core has a cylindrical shape formed of aluminum. The container of claim 1, wherein the container includes a bottom plate having a bottom protrusion protruding from the surface into the core and the inlet is in communication with the interior of the core through the bottom protrusion and is airtight. Electrical energy storage device comprising a sealer for maintaining. The electrical energy storage device of claim 3, wherein the closure includes a bolt that is screwed into the inlet. 5. The bolt of claim 4, wherein the bolt has a thread formed on a surface thereof, the tab portion screwed to the injection hole, and a head portion integrally formed with the tab portion and having an inclined surface inclined by a predetermined angle with respect to the surface of the bottom plate. And an edge of the bottom plate contacting the head along the inclined direction of the inclined surface when the bolt is fastened to be inclined. According to claim 1, wherein the terminal plate is a positive electrode connecting plate having an anode connecting portion electrically connected to the positive electrode and the positive electrode connecting portion, the negative electrode connecting portion electrically connected to the negative electrode of the electrode and the negative electrode connecting portion A negative electrode connecting plate having a negative terminal, the positive and negative connecting parts, and a coupling member surrounding the positive and negative connecting plates to expose the negative electrode connecting plate and the negative electrode connecting plate to expose the terminals, and the coupling And an upper plate protrusion protruding from the surface of the member and inserted into the inside of the winding core, wherein the anti-vibration member is positioned at an end portion of the upper plate protrusion. 7. The electrical energy storage device according to claim 6, wherein the anti-vibration member is a screw fastener screwed to the upper plate protrusion. 8. The electric fastener according to claim 7, wherein the fastener comprises a body portion screwed to the upper plate protrusion and a wing portion formed radially and elastically having a predetermined inclination toward the upper portion of the winding core from the body portion. Energy storage. The method of claim 8, wherein the coupling member has a first accommodation hole for accommodating the positive electrode connection part and a second accommodation hole for accommodating the negative electrode connection part, and is coupled to one side surface of the positive electrode connection plate and the negative electrode connection plate. First coupling member; And And a second coupling member having a third accommodating hole for accommodating the positive electrode terminal and a fourth accommodating hole for accommodating the negative electrode terminal, the second coupling member being coupled to the other side of the positive electrode connecting plate and the negative electrode connecting plate. Electrical energy storage device. The electrical energy storage device of claim 9, wherein the first coupling member and the second coupling member are integrally formed. The electrical energy storage device of claim 10, wherein the first coupling member and the second coupling member are welded by ultrasonic waves. The electrical energy storage device according to claim 6, wherein the terminal plate is injection molded along the circumferences of the positive and negative connection plates, and further includes a sealing member to prevent leakage of the electrolyte solution. A cathode that generates electrons according to a redox reaction, a cathode that absorbs the generated electrons, and a separator that physically isolates the anode and the cathode includes a winding device wound around the core in order, and between the anode and the cathode. Forming an electrode wound body having an electrolyte solution provided thereon; Forming a terminal plate including a vibration preventing member pressed against an inner surface of the winding core to prevent flow with the electrode winding body, and an anode terminal and a cathode terminal electrically connecting the external resistor and the electrode winding body; Inserting the electrode winding body into a container having an injection hole for injecting the electrolyte solution into a bottom portion; Coupling the terminal plate such that the positive and negative terminals of the terminal plate are electrically connected to the positive and negative electrodes, respectively; And And injecting an electrolyte solution into the inlet to sequentially fill the electrolyte solution from a region near the terminal plate of the container toward the bottom of the container. The method of claim 13, wherein the core is formed in an aluminum cylindrical shape. The method of claim 14, wherein forming the terminal plate A positive electrode connecting plate having an anode connecting portion electrically connected to the positive electrode and the positive electrode terminal facing the positive connecting portion, a negative electrode connecting portion electrically connected to the negative electrode, and a negative electrode connecting plate having the negative terminal facing the negative electrode connecting portion; Preparing; Forming a coupling member which insulates the positive electrode connecting plate and the negative electrode connecting plate to surround the positive electrode connecting plate and the negative electrode connecting plate to expose the connection parts and the terminals; And And a vibration preventing member inserted into the winding core to be pressed against the inner surface of the winding core to prevent the flow of the electrode winding body. The method of claim 15, wherein the upper plate protrusion is further formed on a lower surface of the coupling member, and the vibration preventing member is screwed to the upper plate protrusion. 17. The method of claim 16, wherein the step of coupling the terminal plate includes inserting the upper plate protrusion into the core, wherein the vibration preventing member is squeezed obliquely to the inner surface of the core to face downward of the core. A method of manufacturing an electric energy storage device, characterized in that it does not generate a resistance to the air, but generates a resistance to a celebration during the upper portion of the winding core. 18. The method of claim 17, wherein the resistive force is proportional to the elastic force of the anti-vibration member. The method of claim 13, wherein the joining of the container and the terminal plate is performed by welding or seaming. 15. The method of claim 13, further comprising the step of forming a bottom protrusion protruding into the inside of the core in the center of the bottom portion, wherein the injection hole is in communication with the inside of the core through the bottom protrusion How to connect an energy storage device. The method of claim 20, wherein injecting the electrolyte solution Turning the container upside down so that the terminal plate faces the bottom and the bottom face upward; Inserting an injection hose having a width smaller than the diameter of the injection hole into the injection hole; And And supplying the electrolyte solution into the core through the injection hose. 22. The electric energy of claim 21, wherein the electrolyte solution supplied into the core is filled from the adjacent region of the terminal plate and the electrode winding body to fill the winding element from the terminal plate toward the bottom plate. Method of manufacturing storage device. 23. The electric energy storage device according to claim 22, wherein the internal gas already present in the container during the supply of the electrolyte solution is discharged to the outside of the container through a gap between the injection hole and the injection hose. Manufacturing method. The method of claim 13, further comprising closing the injection hole and sealing the inside of the container from the outside after the injection of the electrolyte solution is completed. 25. The method of claim 24, wherein closing the inlet is performed by a bolt screwed with the inlet. 26. The method of claim 25, wherein the bolt includes a tab portion coupled to the inlet and the head portion formed integrally with the tab portion, the bottom surface of the head portion comprises an inclined surface inclined by a predetermined inclination angle with respect to the surface of the bottom plate, The edge portion of the bottom plate is pressed by the inclined surface manufacturing method of an electric energy storage device, characterized in that formed to be inclined at the same inclination angle as the inclined surface.

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