KR20190046089A - Hollow-shaped secondary battery with one-way terminal - Google Patents

Abstract

The present invention relates to a hollow secondary battery having a terminal part, which has a new structure that a terminal tab of a terminal part provided in a hollow secondary battery is formed in one direction and a case is not polarized. The hollow secondary battery of the present invention comprises: an electrode assembly wound in a jelly-roll form to allow a first electrode plate, a second electrode plate, and a separator interposed between the first and second electrode plates to form a hollow part; an insulating member positioned at both ends of the electrode assembly; a terminal assembly coupled to one side of the electrode assembly, and having a hollow part; a cylindrical first case for accommodating the electrode assembly, the insulating member, and the terminal assembly; a cylindrical second case inserted into the hollow parts of the electrode assembly and the terminal assembly, and having open both sides thereof; and a bottom part for connecting ends of the first and second cases, and including a hollow part corresponding to the second case.

Description

[0001] HOLLOW-SHAPED SECONDARY BATTERY WITH ONE-WAY TERMINAL [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow rechargeable battery having a terminal portion, and more particularly, to a hollow rechargeable battery having a terminal rechargeable battery having a terminal reed formed in one direction, .

As technology development and demand for mobile devices increase, the demand for secondary batteries as energy sources is rapidly increasing. Among such secondary batteries, much research has been conducted on lithium secondary batteries having a high energy density and a high discharge voltage, and they have been commercialized and widely used.

As the applications and products of secondary batteries have diversified, battery types have also been diversified to provide output and capacity suitable for them. For example, small-sized mobile devices such as mobile phones, PDAs, digital cameras, and notebook computers use one or two or three small-sized lightweight secondary cells (unit cells) per device depending on the tendency of the products to be small and light.

Such a secondary battery is roughly classified into a cylindrical battery, a prismatic battery and a pouch-shaped battery according to external and internal structural characteristics. The secondary battery is largely classified into a jelly roll type ) And a stacked type (laminated type).

Among them, the conventional cylindrical rechargeable battery equipped with the jelly-roll type electrode assembly has a structure in which the positive electrode tab is attached to the cap assembly and the negative electrode tab is attached to the positive electrode, And is connected to the lower end of the can.

The conventional cap assembly includes a top cap forming a positive terminal, a positive temperature coefficient element (PTC) for blocking the current due to a significant increase in battery resistance when the temperature rises inside the battery, An insulating member for electrically separating the seat belt from the cap plate except for a specific portion, and a cap plate to which a positive electrode tab connected to the positive electrode is connected are sequentially stacked.

The current interrupting element electrically connects the external terminal and the electrode assembly, and when the internal pressure of the battery rises due to an abnormality in the battery, the welded portion is separated from the external terminal or the electrode assembly so that the current is cut off.

The clamping portion is formed at the top of the can so that the cap assembly can be mounted on the top of the can. More specifically, the clamping portion is formed by forming a curved portion inside by bending the upper end of the can, inserting the cap plate, the insulating member, the safety vent, and the outer circumferential face of the upper cap in turn into the gasket, and then bending the upper end. As a result, the cap assembly is mounted by wrapping the gasket located on the inner side of the clamping portion and performing a crimping and pressing process.

However, when the secondary battery of such a conventional structure is exposed to a high temperature environment or a local internal short circuit occurs due to an external impact or the like, a decomposition reaction of the electrolyte occurs at the electrode interface, thereby generating a large amount of gas. The gas generated in such a large quantity causes an increase in the internal pressure of the battery, and when the internal pressure rises to a predetermined pressure or higher, the safety vent operates to discharge the high-pressure gas.

In addition, when the current interrupting device is applied to a high output cell such as an ESS or an automobile battery, it requires a strong and many welding points in order to maintain the current density at the welding site. Therefore, the current interrupting device is difficult to install and takes a long time, There was a problem.

In order to solve these problems, Korean Patent No. 10-0770111 (cylindrical lithium secondary battery), Korean Patent Laid-open No. 10-2016-0022137 (cylindrical lithium-ion battery with improved stability) and Korean Patent No. 10- 1613566 (a terminal assembly for a hollow secondary battery, and a hollow secondary battery including the same) are known.

 In Korean Patent No. 10-0770111, as shown in FIG. 1, the current interrupting device (CID) is operated by the bimetallic structure to interrupt the current at an accurate time, thereby preventing ignition and explosion of the battery.

Korean Patent Laid-Open Publication No. 10-2016-0022137 discloses a method of disposing a gasket between a can and a cap assembly sealing the can to an upper opening of a can storing an electrode assembly so that the gas leaks to the outside, Thereby preventing leakage.

Also, Korean Patent No. 10-1613566 discloses a hollow battery including a hollow penetrating the inside of the battery so as to efficiently dissipate heat inside the battery. The hollow battery includes a terminal through which the hollow penetrating the inside can be connected to the outside Assembly.

However, according to Korean Patent No. 10-0770111 and Korean Patent Laid-open Publication No. 10-2016-0022137, since the cylindrical can itself serves as a cathode by bonding the negative electrode tab of the electrode assembly to the center of the bottom plate of the cylindrical can, There arises a problem that the outside of the semiconductor device has a polarity.

In addition, according to the above-mentioned Japanese Patent No. 10-1613566, since the first terminal portion connected to one side of the electrode assembly and the second terminal portion connected to the other side of the electrode assembly are used by ultrasonic welding, laser welding or the like, The conventional problem that many welding portions are formed on both sides is not solved.

Korean Patent No. 10-0770111 (cylindrical lithium secondary battery) Korean Patent Publication No. 10-2016-0022137 (cylindrical Li-ion battery with improved stability) Korean Patent No. 10-1613566 (Terminal Assembly for Hollow Secondary Battery and Hollow Secondary Battery Including the Same)

In order to solve the above-mentioned problems, the present invention proposes a hollow secondary battery having a terminal structure formed on only one side of the hollow secondary battery and minimizing the welding portion of the terminal portion and preventing the case from being polarized. I want to.

According to the present invention,

An electrode assembly comprising: a first electrode plate, a second electrode plate, and an electrode assembly interposed between the first and second electrode plates, the electrode assembly being wound in a jelly roll shape so as to be hollow;

An insulating member positioned at both ends of the electrode assembly;

A terminal assembly coupled to one side of the electrode assembly and having a hollow;

A cylindrical first case for accommodating the electrode assembly, the insulating member, and the terminal assembly;

A second cylindrical case inserted into the hollow of the terminal assembly and opened at both sides thereof; And

And a bottom portion connecting one end of the first case and the second case and including a hollow portion corresponding to the second case. The present invention also provides a hollow rechargeable battery including the unidirectional terminal portion.

Here, the electrode assembly may include: a first electrode tab connected to the first electrode plate; And a second electrode tab connected to the second electrode plate and formed in the same direction as the first electrode tab.

The terminal assembly may further include: a terminal portion; A pair of terminal tabs protruding through the terminal portions; And a spacing portion of an insulating material spaced apart from the electrode assembly by a predetermined distance.

In addition, a pair of connection holes are formed in the gap holding portion, and the first and second electrode tabs of the electrode assembly pass through the connection hole and are connected to the terminal tab.

The hollow secondary battery having the unidirectional terminal unit according to the present invention further includes an insulation between the outer circumferential surface of the second case and the hollow of the electrode assembly.

In addition, a first O-ring for inserting the terminal portion and the first case is coupled to an outer peripheral portion of the terminal portion, and a second O-ring for inserting the terminal portion and the second case is coupled to an inner hollow peripheral portion of the terminal portion.

Here, a first O-ring coupling groove is formed at an outer peripheral portion of the terminal portion to which a first O-ring is coupled, and a second O-ring coupling groove is formed at an inner hollow peripheral portion of the terminal portion.

The insulating member may include: a first insulating member received on the upper side of the electrode assembly; And a second insulating member accommodated below the electrode assembly, wherein the first insulating portion includes a through hole through which the first and second electrode tabs of the electrode assembly pass.

In addition, a coating material of an insulating material may be applied to the outer circumferential surface or the inner circumferential surface of the first case, the second case, and the flange.

According to the present invention, since the terminal assembly including the unidirectional terminal portion is formed through the fitting method of the fixed portion and the gap holding portion, the welding portion is minimized, so that the installation work is simple.

Further, according to the present invention, by using the insulating portion, the polarity is not generated in the case.

1 is a longitudinal sectional view of a conventional cylindrical secondary battery.
2 is an exploded perspective view of a hollow secondary battery having a unidirectional terminal unit according to the present invention.
3 is a perspective view of a hollow secondary battery having a unidirectional terminal unit according to the present invention.
4 is a cross-sectional view taken along the line A-A 'in Fig.
5 is a view schematically showing the internal structure of the electrode assembly before being wound.

Hereinafter, preferred embodiments of a hollow secondary battery having a unidirectional terminal unit according to an embodiment of the present invention will be described in detail with reference to the drawings. It is to be understood that the terminology or words used herein are not to be construed in an ordinary sense or a dictionary, and that the inventor can properly define the concept of a term to describe its invention in the best possible way And should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

2, a hollow secondary battery having a unidirectional terminal unit according to an embodiment of the present invention includes a pair of terminal tabs connected to an electrode assembly in one direction, and includes a case 100, (200), an insulating member (300), and a terminal assembly (400).

The case 100 includes a cylindrical first case 110 having an internal space for accommodating both the electrode assembly 200, the insulating member 300 and the terminal assembly 400, And a bottom portion 114 integrally connecting one side of the first case 110 and the second case 120. The cylindrical second case 120 is inserted into the first case 110 and the second case 120, . The length of the second case 120 may be the same as the length of the cylindrical first case 110.

A cylindrical second case 120 having a first hollow 122 is integrally connected to the bottom 114 at a central portion of the cylindrical first case 110 having the internal space. A hollow communicating with the first hollow portion 122 of the second case 120 is formed in the bottom portion 114.

The case 100 may be made of aluminum, aluminum alloy, nickel-plated steel, or stainless steel (STS). The case 100 is preferably manufactured by a deep drawing method, but the method of manufacturing the case 100 is not limited thereto.

On the other hand, a coating material of an insulating material may be applied to the outer circumferential surface or the inner circumferential surface of the case 100 to a predetermined thickness.

The electrode assembly 200 includes a separator 215 and a first electrode plate 217a and a second electrode plate 217b which are sequentially and repeatedly stacked with the separator 215 interposed therebetween. In this electrode assembly 200, the first electrode plate 217a, the separation membrane 215 and the second electrode plate 217b are wound in a jelly roll form to include a second hollow 212, The second case 100 and the inner insulating joint 320 to be described later are inserted into the second case 212 to prevent the electrode assembly 200 from being deformed.

A positive electrode active material layer 2172a is formed on the positive electrode collector 2171a of the first electrode plate 217a. The cathode current collector 2171a is formed of a conductive metal material so as to collect electrons from the cathode active material layer 2172a and move them to the outside. The positive electrode active material layer 2172a is formed by mixing a positive electrode active material, a conductive material and a binder (hereinafter, referred to as a positive electrode active material) and coated on both surfaces of the positive electrode collector 2171a to have a predetermined thickness. Here, a region where the cathode active material is peeled off is formed on one side of the cathode active material layer 2172a so that the first electrode tab 227a can be attached.

The negative electrode active material layer 2172b is formed on the negative electrode collector 2171b of the second electrode plate 217b. The anode current collector 2171b is formed of a conductive metal material so as to collect electrons from the anode active material layer 2172b and move them to the outside. The negative electrode active material layer 2172b is manufactured by mixing a negative electrode active material, a conductive material, and a binder (hereinafter, referred to as negative active material), and is coated on both surfaces of the negative electrode collector 2171b to have a predetermined thickness. Here, a region where the negative electrode active material is peeled off is formed on one side of the negative electrode active material layer 2172b so that the second electrode tab 227b can be attached.

2 and 5, the first and second electrode tabs 227a and 227b are formed in a substantially rectangular plate shape. However, the first and second electrode tabs 227a and 227b may have various shapes.

The method of attaching the first and second electrode tabs 227a and 227b to one side of the first and second electrode plates 217a and 217b may be resistance welding, ultrasonic welding, laser welding, spot welding, Here, the attachment method is not limited.

The separation membrane 215 is interposed between the first electrode plate 217a and the second electrode plate 217b to prevent a short circuit, and may be formed of a porous polymer material to allow ions to pass therethrough. Here, the separation membrane 215 may be longer than the first and second electrode plates 217a and 217b.

5, a process of attaching the first and second electrode tabs 227a and 227b to the first and second electrode plates 217a and 217b and winding the same will be described.

In a state where the electrode assembly 200 is not wound, the first electrode tab 227a is attached so as to protrude outward in a region where the cathode active material or the like formed on one side of the first electrode plate 217a is peeled off. At this time, the first electrode tab 227a is attached to the first electrode plate 217a by a distance of x1. The first electrode tab 227a may be attached to the front surface or the rear surface of the first electrode plate 217a, but is preferably attached to the front surface of the first electrode plate 217a.

The second electrode tab 227b is attached to the first electrode tab 217b in such a manner that the second electrode tab 227b protrudes outward in the same direction as the first electrode tab 227a. At this time, the second electrode tab 227b is attached on the second electrode plate 217b by a distance of x2. The second electrode tab 227b may be attached to the front surface or the rear surface of the second electrode plate 217b, but is preferably attached to the rear surface of the second electrode plate 217b.

An insulating tape (not shown) may be adhered to the first electrode tabs 227a and 227b on the first and second electrode plates 217a and 217b.

A difference in distance between x1 and x2 occurs between the first and second electrode tabs 227a and 227b. The difference in distance between the first and second electrode tabs 217a and 217b is Are determined in consideration of the degree to which the tabs 327a and 327b can face each other. Here, the distance x1 or x2 may be determined in consideration of the degree of attenuation of the magnetic field by the first and second electrode tabs 227a and 227b, electrical balance, and the like.

5, when the first and second electrode plates 217a and 217b and the separation membrane 215, which are wound on one side, are wound and the electrode assembly 200 is formed, The first electrode tab 227a and the second electrode tab 227b are arranged to face each other at one side of the electrode assembly 200. [ If the separation membrane 215 is formed longer than the first and second electrode plates 217a and 217b, the separation membrane 215 is continuously wound and the electrode assembly 200). Therefore, the outer circumferential surface and the inner circumferential surface of the electrode assembly 200 are formed of the separation membrane 215.

If a short circuit occurs due to contact between the positive electrode and the negative electrode due to application of an external force or the like to the electrode assembly 200, the function of the secondary battery may be interrupted to cause a safety accident (overheating, ignition, etc.). In order to prevent such a problem, the hollow secondary battery having the unidirectional terminal unit according to the present invention includes a first insulating part 310, an inner insulating part 320, and a second insulating part 330 which are the insulating member 300 do.

The insulating member 300 is preferably made of a material having chemical resistance in consideration of the thermal conductivity and electrical insulation as well as the electrolyte filled in the battery. For example, the insulating member 300 may be made of a material such as polyvinyl difluoride (PVdF), polybutadiene, polyisoprene, polypropylene, ethylene propylene, polyethylene terephthalate (PET), polyimide,

The first insulating member 310 is a member for insulating the upper surface of the electrode assembly 200 from the upper surface of the electrode assembly 200 while preventing a polarity from appearing upward, And may be formed in a disc shape. A third hollow 312 is provided in the central portion of the first insulating member 310 so as to be able to communicate with the second hollow 212. The second hollow 312 is provided with a second case 120, (320) may be inserted.

The first insulating member 310 is provided with a plurality of first through holes 317a and 317b facing each other so as to be symmetrical about the third hollow 312. The first and second through holes 317a and 317b are formed so as to correspond to the cross sectional shape of the first and second electrode tabs 227a and 227b in the width direction and the first and second electrode tabs 227a and 227b It is easy to pass through the through holes 317a and 317b.

The internal insulation connection 320 is interposed between the electrode assembly 200 and the second case 120 so that the case 100 is made of an insulating material so as not to exhibit a polarity and has a fourth hollow 322 therein. The second case 120 may be inserted into the fourth hollow 322.

As described above, the internal insulation 320 can be inserted into the second hollow 212 of the electrode assembly 200, and the fourth hollow 322 of the insulation insulation 320 can be inserted into the second case 212 of the electrode assembly 200, (120) can be inserted. Accordingly, the inner circumferential surface of the electrode assembly 200 and the outer circumferential surface of the second case 120 are insulated by the inner insulating joint 320 so that the polarity of the electrode assembly 200 is not displayed. The length of the internal insulation connection 320 may be extended to a space retaining portion 440, which will be described later, when the hollow secondary battery having the unidirectional terminal portion according to the present invention is assembled.

The second insulating member 330 is a member for insulating the lower surface of the case 100 from being polarized while preventing a short that may be generated on the lower surface of the electrode assembly 200, And may have a disc shape having the same diameter. A fifth hollow 332 is provided at the center of the second insulating member 330 so as to communicate with the second hollow 212 inside the electrode assembly 200, (120) and an inner insulation connection (320) may be inserted.

As described above, since the outer circumferential surface of the electrode assembly 200 is formed of the separation membrane 215, no polarity appears on the inner circumferential surface and / or the outer circumferential surface of the first case 110.

The terminal assembly 400 is coupled to the upper side of the electrode assembly 200 and includes a terminal portion 410 and a gap retaining portion 440.

As shown in FIG. 2, the terminal portion 410 and the gap retaining portion 440 are stacked in order. The terminal portion 410 may have a cylindrical shape and may be made of an insulating material. A sixth hollow 412 is provided at the central portion of the terminal portion 410 and a second case 120 is inserted into the sixth hollow 412.

The outer peripheral portion of the terminal portion 410 is provided with a concave first O-ring engagement groove 413 which is embedded inward along the circumferential direction. The first O-ring 423 may be coupled to the first O-ring coupling groove 413 and the first O-ring 423 may be coupled to the first O- When inserted into the case 110, the gap between the outer circumferential surface of the terminal portion 410 and the inner circumferential surface of the first case 110 is blocked and insulated.

A second O-ring coupling groove 415 is formed in the peripheral portion of the sixth hollow 412 inside the terminal portion 410 along the circumferential direction. A second O-ring 425 may be coupled to the second O-ring coupling groove 415 and a second O-ring 425 may be coupled to the sixth hollow 412 in a state where the second O- When the two cases 120 are inserted, the gap between the inner circumferential surface of the sixth hollow 412 and the outer circumferential surface of the second case 120 is blocked and insulated.

The terminal part 410 is provided with a pair of terminal tabs 417a and 417b facing each other so as to be symmetrical with respect to the center of the sixth hollow 412. The terminal tabs 417a and 417b are connected to the electrode assembly 200 to connect the electricity generated from the electrode assembly 200 to the outside. Accordingly, the terminal tabs 417a and 417b may be made of a conductive material, and may include a first terminal tab 417a having a polarity of an anode and a second terminal tab 417b having a polarity of a cathode. However, it goes without saying that, when the polarity of the electrode assembly 200 is changed, the polarities of the first and second terminal tabs 417a and 417b may be changed accordingly.

2, the first and second terminal tabs 417a and 417b formed on the terminal portion 410 are protruded upwardly and downwardly through the terminal portion 410. In addition, Here, the upper projecting portion may be electrically connected to the outside, and the lower projecting portion may be in electrical contact with the electrode assembly 200. The first and second terminal tabs 417a and 417b may have a cylindrical shape, but are not limited thereto. The first and second terminal tabs 417a and 417b may have various shapes. The terminal portion 410 is preferably manufactured by an insert injection method, but the method of manufacturing the terminal portion 410 is not limited thereto. For example, a method of inserting and fixing first and second terminal tabs 417a and 417b into holes (not shown) formed in the terminal portions 410 may be used.

The gap holding portion 440 may be formed to have a cylindrical shape having the same diameter as that of the terminal portion 410. The gap holding portion 440 may be formed to have a cylindrical shape having the same diameter as that of the terminal portion 410, . A seventh hollow 442 may be provided at the center of the gap holding part 440 and a second case 120 may be inserted into the seventh hollow 442.

The gap holding part 440 is provided with a first connection hole 447a and a second connection hole 447b facing each other so as to be symmetrical with respect to the center of the seventh hollow 442. The first and second connection holes 447a and 447b are formed in the first and second terminal tabs 417a and 417b of the terminal portion 410 and the first and second electrode tabs 227a and 227b of the electrode assembly 200, . The vertical length of the connection holes 447a and 447b is set such that the lower protrusions of the first and second terminal tabs 417a and 417b and the first and second electrode tabs 227a and 227b are connected to the connection holes 447a and 447b As shown in Fig.

The lower protrusions of the first and second terminal tabs 417a and 417b and the protrusions of the first and second electrode tabs 227a and 227b in the connection holes 447a and 447b of the gap retaining part 440, ) May be fixed by ultrasonic welding, laser welding, spot welding or the like, but the welding method is not limited thereto.

Meanwhile, the gap holding part 440 may be divided into two vertically separated from each other with respect to the center of the seventh hollow 442. 2, the first and second connection holes 447a and 447b may be formed by coupling one of the separated gap holding portions 440 and the other.

Hereinafter, an assembling process of a hollow secondary battery having a unidirectional terminal unit according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4. FIG.

3, the first electrode plate 217a, the separation membrane 215 and the second electrode plate 217b which are sequentially stacked are started to be wound on one side. The first and second electrode tabs 227a and 227b protrude from the upper surface of the wound electrode assembly 200 and the electrode assembly 200 has the second hollow 212. [ The internal insulation 320 is inserted into the second hollow 212 of the electrode assembly 200 thus wound.

The inner insulation layer 320 is disposed on one side of the sequentially stacked first electrode plate 217a, the separation layer 215 and the second electrode plate 217b and the outer peripheral surface of the inner insulation layer 320 is surrounded So that the electrode assembly 200 may be formed.

The first and second electrode tabs 227a and 227b formed in the electrode assembly 200 are inserted through the first and second through holes 317a and 317b of the first insulating member 312, The first insulating member 312 is coupled to the upper surface of the electrode assembly 200 while the inner insulating joint 200 is inserted through the third hollow 312 of the insulating member 312.

Next, the first O-ring 423 is coupled to the first O-ring engagement groove 413 of the terminal unit 410, and the second O-ring 425 is coupled to the second O-ring engagement groove 415.

The lower protrusions of the first and second terminal tabs 417a and 417b formed on the terminal portion 410 are in contact with the first and second electrode tabs 227a and 227b protruding upward from the first insulation member 310 Welding or the like.

Next, the first and second terminal tabs 417a and 417b and the first and second electrode tabs 227a and 227b are welded to the first and second connection holes 447a and 447b and the seventh hollow 442 of the gap retaining portion 440 encloses the outer circumferential surface of the inner insulating joint 320. [

The second insulation member 330 is inserted through the fifth hollow 332 of the second insulation member 330 and protrudes slightly toward the lower side of the electrode assembly 200, The insulating member 330 is engaged.

Through this process, the electrode assembly 200, the insulating member 300, the internal insulation 320, and the terminal assembly 400 can be formed as one body.

Next, the second case 120 is inserted into the fourth hollow portion 322 of the inner insulating joint 200 inserted into the electrode assembly 200.

At this time, the first O-ring 425 of the terminal portion 410 closes the inner circumferential surface of the first case 110 and the O-ring 423 seals the outer circumferential surface of the second case 120.

3, the first hollow portion 122 of the second case 120 is formed on both sides of the case 100, and the first hollow portion 122 is formed on one side of the case 100 in one direction The first and second terminal tabs 417a and 417b are exposed to the outside.

It will be appreciated that the above-described process is merely an embodiment of the hollow secondary battery assembly process having the unidirectional terminal unit according to the present invention, and the sequence of the assembling process may be changed as desired.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited thereto and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. And various changes and modifications may be made without departing from the scope of the appended claims.

100: Case 110: First case
120: second case 122: first hollow
200: electrode assembly 212: second hollow
215: separation membrane 217a, 217b: electrode plate
227a, 227b: electrode tab 300: insulating member
310: first insulation member 312: third hollow
317a, 317b: Through hole 320: Internal connection
322: fourth hollow 330: second insulating member
332: fifth hollow 400: terminal assembly
410: terminal portion 412: sixth hollow
413: first O-ring engagement groove 415: second O-ring engagement groove
417a. 417b: terminal tab 423: first o-ring
425: second O-ring 440:
442: seventh hollow 447a, 447b: connecting hollow
2171a, 2171b: collector 2172a, 2172b: active material layer

Claims (10)

An electrode assembly comprising: a first electrode plate, a second electrode plate, and an electrode assembly interposed between the first and second electrode plates, the electrode assembly being wound in a jelly roll shape so as to be hollow;
An insulating member positioned at both ends of the electrode assembly;
A terminal assembly coupled to one side of the electrode assembly and having a hollow;
A cylindrical first case for accommodating the electrode assembly, the insulating member, and the terminal assembly;
A second cylindrical case inserted into the hollow of the terminal assembly and opened at both sides thereof; And
And a bottom portion connecting one end of the first case and the second case and including a hollow portion corresponding to the second case
A hollow secondary battery having a unidirectional terminal portion.
The method according to claim 1,
The electrode assembly includes:
A first electrode tab connected to the first electrode plate; And
And a second electrode tab connected to the second electrode plate and formed in the same direction as the first electrode tab
A hollow secondary battery having a unidirectional terminal portion.
The method according to claim 1,
The terminal assembly includes:
A terminal portion;
A pair of terminal tabs protruding through the terminal portions; And
And a spacing portion of insulating material spaced apart from the electrode assembly by a predetermined distance
A hollow secondary battery having a unidirectional terminal portion.
The method of claim 3,
A pair of connection holes are provided in the interval maintaining portion,
Wherein the first and second electrode tabs of the electrode assembly pass through the connection hole and are connected to the terminal tabs
A hollow secondary battery having a unidirectional terminal portion.
The method according to claim 1,
And a one-directional terminal portion, wherein the unidirectional terminal portion further includes an insulation between the outer circumferential surface of the second case and the hollow of the electrode assembly.
The method of claim 3,
And a first O-ring for insulating the terminal portion from the first case is coupled to the outer peripheral portion of the terminal portion.
The method of claim 3,
And a second O-ring for inserting the terminal portion and the second case is coupled to the hollow inner peripheral portion of the terminal portion.
8. The method according to claim 6 or 7,
A first O-ring coupling groove to which a first O-ring is coupled is formed in an outer peripheral portion of the terminal portion,
And a second O-ring coupling groove is formed in a hollow inner peripheral portion of the terminal portion to which a second O-ring is coupled.
The method according to claim 1,
Wherein the insulating member
A first insulating member received on an upper surface of the electrode assembly; And
And a second insulating member accommodated in a lower surface of the electrode assembly,
Wherein the first insulating member includes a through hole through which the first and second electrode tabs of the electrode assembly pass,
A hollow secondary battery having a unidirectional terminal portion.
The method according to claim 1,
And a unidirectional terminal portion to which a coating material of an insulating material can be applied to an outer circumferential surface or an inner circumferential surface of the first case, the second case, and the flange.

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