KR102012674B1 - Hollow-shaped secondary battery with one-way terminal - Google Patents

Abstract

The present invention relates to a hollow secondary battery having a terminal portion, and more particularly, a terminal tab of a terminal portion provided in the hollow secondary battery is formed in one direction, and a hollow secondary battery having a new structure configured such that the case is not polarized. It is about.
The present invention, the electrode assembly is wound in the form of a jelly roll so that the separator interposed between the first electrode plate, the second electrode plate and the first and second electrode plate to form a hollow; Insulating members 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 accommodating the electrode assembly, the insulating member, and the terminal assembly; A cylindrical second case inserted into a hollow of the electrode assembly and the terminal assembly and having open sides; 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.

Description

Hollow type secondary battery with one-way terminal part {HOLLOW-SHAPED SECONDARY BATTERY WITH ONE-WAY TERMINAL}

The present invention relates to a hollow secondary battery having a terminal portion, and more particularly, a terminal tab of a terminal portion provided in the hollow secondary battery is formed in one direction, and a hollow secondary battery having a new structure configured such that the case is not polarized. It is about.

As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing. Among such secondary batteries, many studies have been conducted on lithium secondary batteries of high energy density and high discharge voltage, and they are commercially used and widely used.

As the applications and products of secondary batteries are diversified, the types of batteries are also diversified to provide outputs and capacities suitable for them. For example, small mobile devices such as mobile phones, PDAs, digital cameras, notebook computers, etc., are using one or two or three small and lightweight secondary batteries (unit cells) per device according to the trend toward smaller and lighter products.

These secondary batteries are roughly classified into cylindrical batteries, rectangular batteries, and pouch-type batteries according to the external and internal structural characteristics, and are largely jelly-roll type (wound type) according to the structure of the electrode assembly of the anode / separation membrane / cathode structure constituting the secondary battery. ) And stacked (stacked).

Among them, a cylindrical secondary battery equipped with a conventional jelly roll type electrode assembly has a cylindrical can and a roll structure that is wound in a jelly roll type to be accommodated inside the can. The positive electrode has a positive electrode tab attached to the cap assembly, and the negative electrode has a negative electrode tab. Is attached and connected to the bottom of the can.

Such a conventional cap assembly includes a top cap forming a positive electrode terminal, a PTC element (Positive Temperature Coefficient element) which blocks a current by greatly increasing battery resistance when the temperature rises inside the battery, and blocks a current when the pressure rises inside the battery; Or a seat belt for exhausting gas, an insulating member for electrically separating the seat belt from the cap plate, except for a specific portion, and a cap plate to which the positive electrode tab connected to the positive electrode is sequentially stacked.

The current interrupting device electrically connects the external terminal and the electrode assembly, and when an abnormality occurs in the battery, the welded part is separated from the external terminal or the electrode assembly when the internal pressure of the battery increases, so that the current is blocked.

The crimping portion is formed at the top of the can to mount the cap assembly to the top of the can. More specifically, the crimping portion is formed by beading the upper end of the can to form the curved portion inwardly, inserting the cap plate, the insulating member, the safety vent and the outer circumferential surface of the upper cap in turn, and then bending the upper end. As a result, the gasket positioned on the inner side of the crimping portion is enclosed, and the cap assembly is mounted by performing a crimping and pressing process.

However, when a secondary battery having 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, whereby a large amount of gas is generated. The gas generated in such a large amount causes the internal pressure of the battery to increase, and when the internal pressure rises above a predetermined pressure, the safety vent operates to discharge the high pressure gas.

In addition, when the current interrupting device is applied to a high output battery such as an ESS or an automobile battery, a strong and many welding points are required to maintain the current density of the welding part, and thus, the installation work is difficult and time consuming, which makes it difficult to use the high output battery. There was a problem.

In order to solve this problem, Korean Patent No. 10-0770111 (cylindrical lithium secondary battery), Korean Patent Publication 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) is known.

 Korean Patent No. 10-0770111, as shown in Figure 1, by operating the current blocking element (CID) by the bimetal structure to prevent the ignition, explosion of the battery by cutting off the current at the correct time.

In addition, Korean Patent Laid-Open Publication No. 10-2016-0022137 installs a gasket between the can and a cap assembly sealing the electrode at an upper opening of a can for accommodating the electrode assembly, so that the gas leaks to the outside or the electrolyte is discharged to the outside by an external impact. To prevent leakage.

In addition, Korean Patent No. 10-1613566 discloses a hollow battery including a hollow penetrating the inside to efficiently dissipate heat inside the battery to the outside, the terminal which can connect the hollow penetrating the inside to the outside An assembly is disclosed.

However, according to the above-described Korean Patent Registration No. 10-0770111 and Korean Patent Publication No. 10-2016-0022137, since the negative electrode tab of the electrode assembly is bonded to the center of the lower plate of the cylindrical can, the cylindrical can itself acts as a negative electrode. The problem occurs that the outside of the polarity.

In addition, according to the Patent No. 10-1613566, 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 use a method such as ultrasonic welding or laser fusion. It does not solve the conventional problem that a large number of welding sites are formed on both sides.

Korea Patent Registration No. 10-0770111 (cylindrical lithium secondary battery) Korean Patent Publication No. 10-2016-0022137 (cylindrical lithium ion battery with improved stability) Korea Registered Patent No. 10-1613566 (Terminal assembly for hollow secondary battery, and hollow secondary battery comprising same)

The present invention proposes a hollow secondary battery having a new structure in which the terminal portion is formed only on one side of the hollow secondary battery, and the welding portion of the terminal portion can be minimized and the case is not polarized. I would like to.

The present invention,

An electrode assembly wound around a first electrode plate, a second electrode plate, and a separator interposed between the first and second electrode plates to form a jelly roll;

Insulating members 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 accommodating the electrode assembly, the insulating member, and the terminal assembly;

A cylindrical second case inserted into a hollow of the electrode assembly and the terminal assembly and having open sides; And

It provides a hollow secondary battery having a one-way terminal portion comprising a; a bottom portion connecting one end of the first case, the second case and including a hollow portion corresponding to the second case.

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.

In addition, the terminal assembly, the terminal portion; A pair of terminal tabs protruding from the terminal portion; And an interval maintaining part of an insulating material spaced apart from each other to maintain a predetermined distance from the electrode assembly.

In addition, a pair of connection holes are provided in the gap maintaining part, and the first and second electrode tabs of the electrode assembly are connected to the terminal tabs through the connection holes.

The hollow secondary battery including the one-way terminal unit according to the present invention further includes an insulation tube between the outer circumferential surface of the second case and the hollow of the electrode assembly.

Meanwhile, a first O-ring for insulating the terminal portion and the first case is coupled to the outer periphery of the terminal portion, and a second O-ring for insulating the terminal portion and the second case is coupled to the inner hollow periphery of the terminal portion.

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

In addition, the insulating member may include a first insulating member accommodated above the electrode assembly; And a second insulating member received under the electrode assembly, wherein the first insulating part includes a through hole through which the first and second electrode tabs of the electrode assembly pass.

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

According to the present invention, since the terminal assembly including the one-way terminal portion is formed through the custom coupling method of the fixing portion and the space maintaining portion, the welding part is minimized, so that the installation work is simple.

Moreover, according to this invention, the effect which a polarity does not appear in a case by using an insulation part is produced.

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

Hereinafter, exemplary embodiments of a hollow secondary battery having a one-way terminal unit according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The terms or words used below should not be construed as being limited to ordinary or dictionary meanings, and the inventors can properly define the concept of terms in order to explain their invention in the best way. It should be interpreted as meanings and concepts corresponding to the technical spirit of the present invention.

Hollow type secondary battery having a one-way terminal portion according to an embodiment of the present invention as a pair of terminal tabs connected to the electrode assembly in one direction, as shown in Figure 2, the case 100, the electrode assembly 200, an insulating member 300, and a terminal assembly 400.

The case 100 has a cylindrical first case 110 having an inner space to accommodate all of the electrode assembly 200, the insulating member 300, and the terminal assembly 400, and a second hollow of the electrode assembly 200. And a cylindrical second case 120 inserted into 212 and both sides of which are open, and a bottom portion 114 which integrally connects one side of the first case 110 and the second case 120. . The length of the second case 120 may be formed to be the same as the length of the cylindrical first case 110.

The cylindrical second case 120 having the first hollow 122 is integrally connected to the bottom portion 114 at the center of the cylindrical first case 110 having the inner space. A hollow communicating with the first hollow 122 of the second case 120 is formed at the bottom 114.

The case 100 may be made of a material such as aluminum, an 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, the outer surface or the inner surface of the case 100 may be coated with a coating material of an insulating material to a predetermined thickness.

The electrode assembly 200 includes a separator 215 and a first electrode plate 217a and a second electrode plate 217b that are sequentially and repeatedly stacked with the separator 215 therebetween. The electrode assembly 200 includes a second hollow 212 formed therein by winding a first electrode plate 217a, a separator 215, and a second electrode plate 217b in the form of a jelly roll. The second case 100 and the inner insulation tube 320 to be described later may be inserted into 212 to prevent deformation of the electrode assembly 200.

A cathode active material layer 2172a is formed on the cathode current collector 2171a of the first electrode plate 217a. The positive electrode current collector 2171a is formed of a conductive metal material to collect electrons from the positive electrode active material layer 2172a and move them to the outside. The positive electrode active material layer 2172a is manufactured by mixing a positive electrode active material, a conductive material, and a binder (hereinafter referred to as a positive electrode active material), and is formed by coating a predetermined thickness on both surfaces of the positive electrode current collector 2171a. 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 is attached.

A negative electrode active material layer 2172b is formed on the negative electrode current collector 2171b of the second electrode plate 217b. The negative electrode current collector 2171b is formed of a conductive metal material to collect electrons from the negative electrode 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 a negative electrode active material), and is formed by coating a predetermined thickness on both surfaces of the negative electrode current collector 2171b. 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 have a substantially thin rectangular plate shape, but are not limited thereto and may be configured in various shapes.

The first and second electrode tabs 227a and 227b may be attached to one side of the first and second electrode plates 217a and 217b by using resistance welding, ultrasonic welding, laser welding, spot welding, or the like. The attachment method is not limited here.

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

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

In the state in which the electrode assembly 200 is not wound, the first electrode tab 227a is attached to a region where the positive electrode active material, etc., formed on one side of the first electrode plate 217a is peeled off. In this case, the first electrode tab 227a is attached to the first electrode plate 217a by an x1 distance. 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 region where the negative electrode active material is formed on one side of the second electrode plate 217b so as to protrude outward in the same direction as the first electrode tab 227a. In this case, the second electrode tab 227b is attached to the second electrode plate 217b by an x2 distance apart. The second electrode tab 227b may be attached to the front or rear surface of the second electrode plate 217b, but preferably, the second electrode tab 227b is attached to the rear surface of the second electrode plate 217b.

Here, an insulating tape (not shown) may be attached to a portion where the first and second electrode tabs 227a and 227b are attached on the first and second electrode plates 217a and 217b.

A distance difference between x1 and x2 occurs between the first and second electrode tabs 227a and 227b, and the first and second electrodes are formed after winding of the first and second electrode plates 217a and 217b ends. This is determined in consideration of the extent to which the tabs 327a and 327b face each other. Here, the distance of 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, an electrical balance, and the like.

Subsequently, as shown in FIG. 5, when the first and second electrode plates 217a and 217b and the separator 215 which are started to be wound are finished on the one side and the electrode assembly 200 is formed, the first electrode tab is formed. The 227a and the second electrode tab 227b are disposed to face each other at one side of the electrode assembly 200. Here, when the separator 215 is formed longer than the first and second electrode plates 217a and 217b, even when the winding of the first and second electrode plates 217a and 217b ends, the separator 215 is continuously wound to form an electrode assembly ( It will surround the outer surface of the 200). Therefore, the outer circumferential surface and the inner circumferential surface of the electrode assembly 200 are formed of a separator 215.

On the other hand, when an external force or the like is applied to the electrode assembly 200 and a short occurs due to the contact between the positive electrode and the negative electrode, the function of the secondary battery may be stopped and a safety accident (overheating, fire, etc.) may occur. In order to prevent this problem, the hollow secondary battery including the one-way terminal part according to the present invention includes a first insulating part 310, an inner insulating tube 320, and a second insulating part 330, which are insulating members 300. do.

The insulating member 300 is preferably made of a material having chemical resistance in consideration of not only thermal conductivity and electrical insulation but also the electrolyte is 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, or the like.

The first insulating member 310 is a member to insulate the polarity from appearing in the upper direction while preventing shorts that may occur on the upper surface of the electrode assembly 200. The first insulating member 310 has the same diameter as the side surface of the electrode assembly 200. It can be made into disc shape. A third hollow 312 is provided at the center of the first insulating member 310 to communicate with the second hollow 212, and the third hollow 312 is provided with the second case 120 and the inner insulation tube. 320 may be inserted.

The first insulating member 310 is provided with a plurality of first and second through holes 317a and 317b facing each other such that they are symmetric about the third hollow 312. The first and second through holes 317a and 317b are formed to correspond to the cross-sectional shapes of the first and second electrode tabs 227a and 227b in the width direction. It is easy to penetrate the first and second through holes 317a and 317b.

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

As described above, the inner insulation tube 320 may be inserted into the second hollow 212 of the electrode assembly 200, and in this state, the second casing may be the fourth hollow 322 of the inner insulation tube 320. 120 may be inserted. Therefore, the inner circumferential surface of the electrode assembly 200 and the outer circumferential surface of the second case 120 are insulated by the inner insulation tube 320 such that the polarity of the electrode assembly 200 does not appear. The length of the internal insulation tube 320 may extend to the interval maintaining part 440 to be described later in a state where the hollow secondary battery having the one-way terminal part according to the present invention is assembled.

The second insulating member 330 is a member for insulating the lower surface of the case 100 so that the polarity does not appear while preventing shorts that may occur on the lower surface of the electrode assembly 200. It may be made of a disk shape having the same diameter as. A fifth hollow 332 is provided at the center of the second insulating member 330 to communicate with the second hollow 212 in the electrode assembly 200, and the second hollow 332 has a second case. 120 and the inner insulation tube 320 may be inserted.

Meanwhile, as described above, since the outer circumferential surface of the electrode assembly 200 is formed of the separator 215, polarities do not appear on the inner circumferential surface and / or the outer circumferential surface of the first case 110.

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

As shown in FIG. 2, the terminal part 410 and the gap maintaining part 440 are stacked in order. The terminal portion 410 may be made of an insulating material while forming a cylindrical shape. A sixth hollow 412 may be provided at the center of the terminal unit 410, and a second case 120 may be inserted into the sixth hollow 412.

The outer circumferential portion of the terminal portion 410 is provided with a concave first o-ring coupling groove 413 recessed inward in the circumferential direction. The first O-ring 423 may be coupled to the first O-ring coupling groove 413, and the terminal part 410 may be firstly coupled to the first O-ring coupling groove 413. When inserted into the case 110, the gap between the outer circumferential surface of the terminal unit 410 and the inner circumferential surface of the first case 110 is prevented and insulated.

A second O-ring coupling groove 415 recessed along the outer circumferential direction is provided at a periphery of the sixth hollow 412 that is inside the terminal unit 410. A second O-ring 425 may be coupled to the second O-ring coupling groove 415, and the second O-ring 425 may be coupled to the sixth hollow 412 in a state in which the second O-ring 425 is coupled to the second O-ring coupling groove 415. When the second case 120 is inserted, the separation between the inner circumferential surface of the sixth hollow 412 and the outer circumferential surface of the second case 120 is prevented and insulated.

The terminal portion 410 is provided with a pair of terminal tabs 417a and 417b facing each other to be symmetrical with respect to the center of the sixth hollow 412. The terminal tabs 417a and 417b are connected from the electrode assembly 200 to connect 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 positive polarity and a second terminal tab 417b having a negative polarity. However, when the polarity of the electrode assembly 200 is changed, the polarities of the first and second terminal tabs 417a and 417b may also be changed accordingly.

As shown in FIG. 2, the first and second terminal tabs 417a and 417b formed in the terminal part 410 are provided to protrude upward and downward through the terminal part 410. The upper protrusion may be electrically connected to the outside, and the lower protrusion may be in electrical contact with the electrode assembly 200. The first and second terminal tabs 417a and 417b may be formed in a cylindrical shape, but the present invention is not limited thereto and may be configured in various shapes. The terminal part 410 is preferably manufactured by insert injection method, but is not limited to the manufacturing method of the terminal part 410. For example, a method of inserting and fixing the first and second terminal tabs 417a and 417b into a hole (not shown) formed in the terminal unit 410 may be used.

The gap maintaining part 440 is provided to keep the terminal part 410 and the electrode assembly 200 apart from each other by a predetermined distance, and have a cylindrical shape having the same diameter as the terminal part 410. Can be. A seventh hollow 442 may be provided in the center of the gap maintaining part 440, and a second case 120 may be inserted into the seventh hollow 442.

The gap maintaining part 440 is provided with a first connecting hole 447a and a second connecting hole 447b facing each other to be symmetrical about the seventh hollow 442. The first and second connection holes 447a and 447b are inserted into 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. Can be. Vertical lengths of the connection holes 447a and 447b include lower protrusions of the first and second terminal tabs 417a and 417b and the first and second electrode tabs 227a and 227b inside the connection holes 447a and 447b. Are formed to be in contact with each other.

As shown in FIG. 4, the lower protrusion of the first and second terminal tabs 417a and 417b and the first and second electrode tabs 227a and 227b in the connection holes 447a and 447b of the gap maintaining part 440. ) May be fixed by ultrasonic welding, laser welding, spot welding, etc., but the welding method is not limited thereto.

On the other hand, the gap maintaining portion 440 may be formed in a shape separated in both sides divided in the vertical direction with respect to the center of the seventh hollow 442. Therefore, as shown in FIG. 2, when one side and the other side of the separated gap maintaining unit 440 are coupled, first and second connection holes 447a and 447b may be formed.

Hereinafter, referring to FIGS. 2 to 4, a process of assembling a hollow secondary battery having a one-way terminal unit according to an embodiment of the present invention will be described.

First, as shown in FIG. 3, the first electrode plate 217a, the separator 215, and the second electrode plate 217b sequentially stacked start to be wound on one side. First and second electrode tabs 227a and 227b protrude from the top surface of the electrode assembly 200 after the winding is completed, and the electrode assembly 200 has a second hollow 212. An internal insulation tube 320 is inserted into the second hollow 212 of the electrode assembly 200 formed by being wound in this way.

In addition, an inner insulation tube 320 is positioned on one side of the sequentially stacked first electrode plate 217a, the separator 215, and the second electrode plate 217b, and surrounds an outer circumferential surface of the inner insulation tube 320. It may be wound so that the electrode assembly 200 may be formed.

Next, 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, and the first As the inner insulation pipe 200 is inserted through the third hollow 312 of the insulation member 312, the first insulation member 312 is coupled to the upper surface of the electrode assembly 200.

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

Next, lower protrusions of the first and second terminal tabs 417a and 417b formed on the terminal portion 410 and first and second electrode tabs 227a and 227b protruding upward of the first insulating member 310 are in contact with each other. After welding is fixed in such a way.

Next, a portion in which the first and second terminal tabs 417a and 417b and the first and second electrode tabs 227a and 227b are welded is coupled to each other by the separated spacer 440. 447a and 447b are accommodated in the inside, and the seventh hollow 442 of the gap maintaining part 440 surrounds the outer circumferential surface of the inner insulation tube 320.

Next, an inner insulation tube 200 which protrudes slightly downward of the electrode assembly 200 through the fifth hollow 332 of the second insulation member 330 is inserted into the lower surface of the electrode assembly 200. The insulating member 330 is coupled.

Through this process, the electrode assembly 200, the insulating member 300, the internal insulation tube 320, and the terminal assembly 400 may be integrally formed.

Next, the second case 120 is inserted into the fourth hollow 322 of the inner insulation tube 200 inserted into the electrode assembly 200.

In this case, the first O-ring 425 of the terminal unit 410 seals the inner circumferential surface of the first case 110, and the second O-ring 423 seals the outer circumferential surface of the second case 120.

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

The above-described process is only one embodiment of the hollow secondary battery assembly process provided with the one-way terminal unit according to the present invention, and the order of the assembly process may be changed.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art and the technical spirit of the present invention. Of course, it can be modified and modified in various ways within the scope of the claims.

100: case 110: first case
120: second case 122: first hollow
200: electrode assembly 212: second hollow
215: separator 217a, 217b: electrode plate
227a, 227b: electrode tab 300: insulating member
310: first insulating member 312: third hollow
317a, 317b: through hole 320: internal insulation tube
322 fourth hollow 330 second insulating member
332: fifth hollow 400: terminal assembly
410: terminal portion 412: sixth hollow
413: first O-ring coupling groove 415: second O-ring coupling groove
417a. 417b: terminal tab 423: first O-ring
425: second O-ring 440: spacing maintenance unit
442: seventh hollow 447a, 447b: connecting hole
2171a and 2171b: current collectors 2172a and 2172b: active material layer

Claims (11)

An electrode assembly wound around a first electrode plate, a second electrode plate, and a separator interposed between the first and second electrode plates to form a jelly roll;
Insulating members positioned at both ends of the electrode assembly;
A terminal assembly coupled to one side of both sides of the electrode assembly and having a hollow;
A cylindrical first case accommodating the electrode assembly, the insulating member, and the terminal assembly;
A cylindrical second case inserted into a hollow of the electrode assembly and the terminal assembly and having open sides; And
And a bottom part connecting one end of the first case and the second case to each other and including a hollow part corresponding to the second case.
The other side of the both sides of the electrode assembly is configured such that the terminal assembly is not coupled
Hollow type secondary battery having a one-way terminal portion.
The method of claim 1,
The electrode assembly,
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.
Hollow type secondary battery having a one-way terminal portion.
The method of claim 1,
The terminal assembly,
Terminal section;
A pair of terminal tabs protruding from the terminal portion; And
It includes a gap maintaining portion of the insulating material spaced apart to maintain a predetermined distance from the electrode assembly;
Hollow type secondary battery having a one-way terminal portion.
The method of claim 3,
The gap maintaining part is provided with a pair of connecting holes,
The first and second electrode tabs of the electrode assembly are connected to the terminal tab through the connection hole.
Hollow type secondary battery having a one-way terminal portion.
The method of claim 1,
The hollow secondary battery having a one-way terminal portion further comprises an insulating tube between the outer circumferential surface of the second case and the hollow of the electrode assembly.
The method of claim 3,
A hollow secondary battery having a one-way terminal portion in which the outer peripheral portion of the terminal portion is coupled with a first O-ring for insulating the terminal portion and the first case.
The method of claim 3,
A hollow secondary battery having a one-way terminal part, wherein a second O-ring for insulating the terminal part and the second case is coupled to the inner hollow peripheral part of the terminal part.
The method of claim 6,
Hollow secondary battery having a one-way terminal portion is formed in the outer peripheral portion of the terminal portion is the first O-ring coupling groove is coupled to the first O-ring.
The method of claim 1,
The insulating member,
A first insulating member accommodated on an upper surface of the electrode assembly; And
And a second insulating member accommodated on the lower side of the electrode assembly.
The first insulating member includes a through hole through which the first and second electrode tabs of the electrode assembly pass.
Hollow type secondary battery having a one-way terminal portion.
The method of claim 1,
A hollow secondary battery having a one-way terminal part coated with an insulating material on an outer circumferential surface or an inner circumferential surface of each of the first case, the second case, and the insulating members.
The method of claim 7, wherein
A hollow secondary battery having a one-way terminal portion in which a second O-ring coupling groove to which a second O-ring is coupled is formed at an inner hollow peripheral portion of the terminal portion.

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