WO2018074773A1

WO2018074773A1 - Secondary battery

Info

Publication number: WO2018074773A1
Application number: PCT/KR2017/011225
Authority: WO
Inventors: 김치영
Original assignee: 삼성에스디아이 주식회사
Priority date: 2016-10-17
Filing date: 2017-10-12
Publication date: 2018-04-26
Also published as: KR20180041979A; KR102312279B1

Abstract

A secondary battery according to one embodiment of the present invention comprises: an electrode assembly formed by winding a separator interposed between a first electrode and a second electrode; a case in which the electrode assembly is embedded; and a fixing tape fixed to the outer surface of the electrode assembly so as to maintain the winding state of the electrode assembly, and having an adhesive part to which an adhesive material is attached so as to be adhered to the outer surface of the electrode assembly, and an inlet part formed to be adjacent to the adhesive part and spaced from the electrode assembly.

Description

Secondary battery

The present invention relates to a secondary battery.

A secondary battery is a battery that can be charged and discharged unlike a primary battery that is not rechargeable. Secondary batteries are widely used in portable electronic devices such as mobile phones, laptops and camcorders, or widely used as power sources for driving motors of hybrid vehicles.

The secondary battery includes an electrode assembly including a positive electrode and a negative electrode and a separator interposed between the positive electrode and the negative electrode. The electrode assembly is accommodated in the case to perform charging and discharging, and the case is provided with terminals to supply or receive current. The case may be made of a metal plate or pouch.

In general, an electrode assembly of a secondary battery winds a cathode, an anode, and a separator together in a jellyroll form. The electrode assembly in the completed winding state is attached to the fixing tape on the side to prevent loosening.

Recently, in order to improve the stability of the secondary battery, a fixed tape is attached to the upper or lower electrode assembly.

However, due to the fixing tape attached to the upper or lower portion, the electrolyte injected into the case may be impregnated into the electrode assembly, thereby affecting the performance of the secondary battery.

One aspect of the present invention is to provide a secondary battery in which the electrode assembly and the electrolyte is more stably impregnated inside the case, and the safety is improved even in the external impact such as falling.

According to an embodiment of the present invention, a secondary battery includes an electrode assembly formed by winding a separator interposed between a first electrode and a second electrode, a case in which the electrode assembly is embedded, and the electrode assembly is fixed to an outer surface of the electrode assembly. And a fixing tape which maintains a wound state of the assembly, is formed with an adhesive part attached to the outer surface of the electrode assembly and adjacent to the adhesive part, and an inlet part spaced apart from the electrode assembly.

The fixing tape may include an end tape bonded to an end of the electrode assembly, and a central tape attached to a first surface of the electrode assembly while fixing the winding end portions of the wound first and second electrodes. have.

The end tape may be adhered over the first surface of the electrode assembly and a second surface opposite to the first surface.

The end tape may be formed longer on the second surface than on the first surface.

The inlet may be spaced apart from the electrode assembly by the thickness of the adhesive material.

The fixing tape may have an elastic force.

The fixing tape may be formed in a mesh form.

The inlet may be opened to form a plurality.

The inlet may be disposed in the width direction of the electrode assembly.

The inlet may be formed in a circular or polygonal shape.

The adhesive part may be uniformly formed over the entire area of the fixing tape.

The adhesive part may be formed in a portion of the fixing tape.

The adhesive part may include a hollow part formed at the center.

The adhesive part may be formed in a circular or polygonal shape.

The hollow portion may be formed in a circular or polygonal shape.

According to an embodiment of the present invention, the electrode assembly inside the case may be more stably impregnated into the electrolyte solution injected through the electrolyte injection hole.

In addition, the safety of the secondary battery may be improved by preventing the electrode assembly from being loosened or short-circuited even in an external impact such as a drop.

1 is a perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.

2 is a perspective view illustrating a rechargeable battery according to another exemplary embodiment of the present invention.

3 is a perspective view illustrating an electrode assembly applied to a secondary battery of embodiments of the present invention.

4 is a side view of the electrode assembly shown in FIG. 3.

5 is a plan view showing a fixing tape of a first modification applied to the electrode assembly of the embodiments of the present invention.

6 is a plan view showing a fixing tape of a second modification applied to the electrode assembly of the embodiments of the present invention.

7 is a plan view showing a fixing tape of a third modification applied to the electrode assembly of the embodiments of the present invention.

8 is a plan view showing a fixing tape of a fourth modification applied to the electrode assembly of the embodiments of the present invention.

9 is a plan view showing a fixing tape of a fifth modification applied to the electrode assembly of the embodiments of the present invention.

10 is a plan view showing a fixing tape of a sixth modification applied to the electrode assembly of the embodiments of the present invention.

11 is a plan view showing a fixing tape of a seventh modification applied to the electrode assembly of the embodiments of the present invention.

12 is a plan view showing a fixing tape of an eighth modification applied to the electrode assembly of the embodiments of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to the illustrated.

Throughout the specification, when a part is "connected" to another part, it includes not only "directly connected", but also "indirectly connected" between other members. In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

Referring to FIG. 1, the secondary battery 100 may include a case 20 in which the electrode assembly 10 (see FIG. 3) is embedded and a cap assembly 30 coupled to the case 20.

Secondary battery 100 according to an embodiment of the present invention will be described as an example of a rectangular as a lithium ion secondary battery.

The case 20 is formed of an approximately rectangular parallelepiped, and an opening is formed in one surface thereof. The case 20 may be made of aluminum or stainless steel.

The cap assembly 30 protrudes outside of the cap plate 31 and the cap plate 31 covering the opening of the case 20, and has a first terminal electrically connected to the first electrode 11 (see FIG. 2). 32 and a second terminal 34 protruding out of the cap plate 31 and electrically connected to the second electrode 12 (see FIG. 2).

The cap plate 31 is formed in the shape of an elongated plate extending in one direction and is coupled to the opening of the case 20. The first terminal 32 and the second terminal 34 are installed to protrude above the cap plate 31.

The cap plate 31 may be provided with a sealing stopper (not shown) installed in the electrolyte injection hole 36 and a vent plate 35 having a notch 35a formed to be opened at a set pressure.

The first terminal 32 may have a rectangular plate shape. An upper insulating member 32b may be installed between the first terminal 32 and the cap plate 31 to electrically insulate the first terminal 32 and the cap plate 31.

The second terminal 34 may have a rectangular plate shape. A connection member 34b for electrically connecting the second terminal 34 and the cap plate 31 may be installed below the second terminal 34. Accordingly, the cap plate 31 and the case 20 may be charged with the second electrode 12.

The electrode assembly 10 is accommodated in the case and sealed with the cap assembly 30. In this case, the electrolyte may be injected into the case 20 through the electrolyte injection hole 36 formed in the cap plate 31. Therefore, the electrode assembly 10 inside the case 20 may be completely impregnated with the injected electrolyte. At this time, when a part of the electrode assembly 10 is not impregnated with the electrolyte, a disturbance in the movement of electrons may occur, which may cause a decrease in performance of the secondary battery 100.

Referring to FIG. 2, the secondary battery 101 may include an electrode assembly 10 and a pouch case 25 accommodating the electrode assembly 10. Secondary battery 101 according to another embodiment of the present invention will be described as a pouch type as a lithium ion secondary battery as an example.

The pouch case 25 may be sealed by combining the first plate 25a and the second plate 25b. The first plate 25a and the second plate 25b of the pouch case 25 are formed in a multilayer sheet structure. For example, the pouch case 25 may be made of a metal sheet or a polymer sheet. The polymer sheet forms an inner surface of the pouch and insulates and heat-bonds, and forms a protective outer surface of the pouch. In one example, the polymer sheet may be a nylon sheet, a polyethyleneterephthalate (PET) sheet or a PET-nylon composite sheet. The metal sheet provides mechanical strength and may be, for example, an aluminum sheet.

The accommodating part 25c accommodates the electrode assembly 10 and may be formed on either the first plate 25a or the second plate 25b of the pouch case 25. A junction portion at which the first lead tab 27 and the second lead tab 28 are electrically connected to the electrode assembly 10 may be formed at an upper end of the accommodation portion 25c. The first lead tab 27 is electrically connected to the first electrode tab 11a of the electrode assembly 10, and the second lead tab 28 is electrically connected to the second electrode tab 12a of the electrode assembly 10. Is connected.

In the joint portion, the first plate 25a and the second plate 25b of the pouch case 25 may be thermally bonded to each other. The junction part is also formed in the accommodating part 25c side surface, and the 1st board 25a and the 2nd board 25b can be joined by heat-sealing.

Protective tapes 29 may be attached to the first lead tabs 27 and the second lead tabs 28, respectively. Accordingly, the pouch case 25, the first lead tabs 27, and the second lead tabs 28 can prevent the risk of contact short circuit. The joining part by which the protective tape 29 is affixed between the 1st board | substrate 25a and the 2nd board | substrate 25b, and the 1st lead tab 27 and the 2nd lead tab 28 are taken out is the accommodating part 25c. It may be thicker than the side joints.

Referring to FIG. 3, the fixing tape 40 is attached to the electrode assembly 10 in which the first electrode 11, the second electrode 12, and the separator 13 are wound together.

The first electrode 11 may be an anode and the second electrode 12 may be a cathode. The positive electrode includes a positive electrode plate made of a strip metal thin plate and a positive electrode active material layer coated on one or both sides of the positive electrode plate. The positive electrode plate may be made of a metal material having excellent conductivity, such as an aluminum thin plate. The positive electrode active material layer may be formed of a material in which a binder and a conductive material are mixed with a lithium oxide. The negative electrode includes a negative electrode active material layer coated on one or both surfaces of the negative electrode plate and the negative electrode plate made of a thin metal plate of the strip phenomenon. The negative electrode current collector may be made of a metal material having excellent conductivity, for example, a copper thin plate. The negative electrode active material layer may be formed of a material in which a binder conductive material is mixed with a carbonaceous negative electrode active material. The separator 13 is made of a porous material, and may be made of polyolefin and polyethylene polypropylene.

The positive electrode tab is located at one end side in the longitudinal direction of the electrode assembly 10, and the negative electrode tab is located at the other end in the longitudinal direction of the electrode assembly 10.

The first electrode 11, the second electrode 12, and the separator 13 are wound a plurality of times to form the electrode assembly 10. In this case, the fixing tape 40 may be attached to the outermost portion of the electrode assembly 10 in the completed winding state, thereby preventing the wound electrode assembly 10 from being loosened. In addition, the electrode assembly 10 wound by an external shock such as a drop or a collision can be released. Accordingly, the fixing tape 40 is attached to the winding end portions of the first electrode 11, the second electrode 12, and the separator 13 on the outer surface of the electrode assembly 10, thereby loosening the electrode assembly 10. To prevent them.

Due to the attachment of the fixing tape 40, the electrode assembly 10 may be loosened even by an external impact, or as a result, the first and second electrodes 11 and 12 may be shorted. Can be prevented. Therefore, the safety of the

secondary batteries

100 and 101 may be further improved.

The fixing tape 40 may also be installed at the end of the electrode assembly 10. The fixed tape 40 includes

end tapes

42 and 46 and a central tape 44. For example, the

end tapes

42 and 46 may be installed at the end of the electrode assembly 10, and the center tape 44 may be installed on the outer surface of the electrode assembly 10.

In particular, the first end tape 42 installed at the upper end of the electrode assembly 10 may be positioned and attached between the first electrode tab 11a and the second electrode tab 12a. However, when the separation distance between the first electrode tab 11a and the second electrode tab 12a is not sufficient, the first end tape 42 may be divided into a plurality and attached. However, it is preferable to be attached between the first electrode tab 11a and the second electrode tab 12a to prevent external impact and workability.

The first end tape 42 may be attached over the first surface and the second surface of the electrode assembly 10. For example, the first end tape 42 may be attached over the front and rear surfaces of the electrode assembly 10 and may be attached in a U shape while surrounding the end. The first surface may be a front surface of the electrode assembly 10. The second surface may be a rear surface of the electrode assembly 10 as a surface opposite the first surface.

A portion of the first end tape 42 attached to the first surface may be shorter than a portion attached to the second surface. For example, not only the

end tapes

42 and 46 but also the central tape 44 may be attached to the first surface of the electrode assembly 10, so that the length of the

end tapes

42 and 46 attached to the first surface may be adjusted. It is formed shorter than the

end tapes

42 and 46 attached to the second surface, so that the center tape 44 may be attached to secure a space to be seated.

The second end tape 46 attached to the lower end of the electrode assembly 10 may have the same width as the first end tape 42. In addition, the width of the central tape 44 attached to the central portion of the electrode assembly 10 may be the same. By forming the same width, the workability of the step of attaching the fixing tape 40 to the electrode assembly 10 can be improved. The second end tape 46 may be attached over the first and second surfaces of the electrode assembly 10. For example, the second end tape 46 may be attached in a U shape while surrounding the lower end of the electrode assembly 10.

4 is a side view of the electrode assembly shown in FIG. 3.

Referring to FIG. 4, the first end tape 42 and the second end tape 46 may be attached to the first and second surfaces of the electrode assembly 10 while surrounding the upper and lower ends of the electrode assembly 10. Can be.

First, the central tape 44 is attached to a winding end portion formed by winding the first electrode 11, the second electrode 12, and the separator 13 of the electrode assembly 10. Therefore, the central tape 44 may be installed on the first surface of the electrode assembly 10.

Next, the first end tape 42 and the second end tape 46 may be connected to the first surface and the second surface in front of the electrode assembly 10 and attached to the end of the electrode assembly 10. Accordingly, the electrode assembly 10 may prevent the first electrode 11, the second electrode 12, and the separator 13 from swelling or being wound up even by an external impact. .

In particular, the first end tape 42 and the second end tape 46 may have different attachment lengths attached to the first surface and the second surface of the electrode assembly 10. Through this, the attachment length is formed long on the weak part of the electrode assembly 10 to fix the electrode assembly 10 to improve the safety of the electrode assembly 10.

The fixing tapes 40 described above have elastic force. Therefore, even when the electrode assembly 10 swells due to external impact, the electrode assembly 10 may be restored to its original state without significant damage by the elastic force of the fixing tape 40.

The fixing tape 40 may include an adhesive part 47 and an inlet part 48 (see FIGS. 5 to 12) through which an electrolyte may be introduced. An adhesive material may be attached to the adhesive part 47 to be attached to the electrode assembly 10. In this case, the inlet part 48 may not be attached to the adhesive material and may be spaced apart from the electrode assembly 10 by the thickness of the adhesive material. This will be described later in detail.

5 is a plan view showing a fixing tape of the first modification applied to the electrode assembly of the embodiments of the present invention, Figure 6 is a plan view showing a fixing tape of the second modification applied to the electrode assembly of the embodiments of the present invention.

5 and 6, the fixing tape 40 may include an adhesive part 47 attached to the electrode assembly 10 and an inlet part 48 into which the electrolyte is introduced.

The fixing tape 40 may be made of a material having an elastic force. For example, the fixing tape 40 may be made of styrene butadiene rubber. In addition, the resin substrate may be made of any one of an insulating material having high heat resistance, for example, polyethylene terephthalate (PET), polypropylene (PP, poly propylene), or polyimide (PI). have.

In particular, an adhesive material may be attached to the adhesive parts 47 of the fixing tapes 40, and the adhesive material may be made of an oriented polystyrene (OPS) film. The OPS film is not normally adhesive, but may be adhesive when reacted with a certain component of the electrolyte, such as dimethyl carbonate (DMC).

More specifically, the OPS film is a solid film and generally does not have adhesiveness. However, when the OPS film reacts with the DMC, the DMC penetrates into the pores of the polymer chain, and thus the polymer chain is in a fluid state and is easily moved. Will have The OPS film reacts with the DMC so that the solid phase is changed into a viscous liquid state, and thus adhesiveness can be obtained in the process.

The adhesive part 47 of the fixing tape 40 may be patterned and disposed on the fixing tape 40. That is, the adhesive part 47 may be uniformly formed over the entire area of the fixing tape 40. In addition, the adhesive part 47 may be formed in a portion of the fixing tape 40.

The electrolyte injected into the case 20 (see FIG. 1) flows through the upper surface fixing tape 42 (see FIG. 2) attached to the upper end of the electrode assembly 10, and the electrolyte solution is connected to the fixing part 40 of the fixing tape 40. You can't pass this.

Therefore, the electrolyte may pass through the fixing tape 40 except for the adhesive portion 47 formed uniformly, which is a passage through which the electrolyte may flow into the electrode assembly 10 (see FIG. 2). That is, the electrolyte may penetrate into the electrode assembly 10 except for the adhesive part 47 formed on the fixing tape 40.

The adhesive part 47 may be formed in a circular shape. Uniformly aligned rows and columns may be arranged throughout the fixed tape 40 area. The adhesive part 47 may be uniformly disposed so that the electrolyte may be easily introduced while maintaining the adhesive force with the electrode assembly 10 and the fixing tape 40. Since the first end tape 42 and the second end tape 46 are connected along the front and rear surfaces of the electrode assembly 10, the adhesive part 47 may also be formed on the front and rear surfaces.

However, when the first electrode 11 (see FIG. 2) and the second electrode 12 (see FIG. 2) of the electrode assembly 10 is prevented from being shorted, the first end tape ( 42 and the adhesive part 47 may be omitted in the thickness direction of the electrode assembly 10 in order to prevent the risk that the second end tape 46 may fall off.

Unlike the first modification illustrated in FIG. 5, the second modification illustrated in FIG. 6 may form most of the fixed tape 40 area as the adhesive portion 47, and may uniformly form the inflow portion 48. . That is, the inlet part 48 to which the OPS film is not attached may be uniformly arranged in a predetermined shape over the entire area of the fixing tape 40. This second modification can be used when it is more important to improve the stability of the electrode assembly 10.

That is, when the adhesive portion 47 is increased as described above, the fixing tape 40 may fix the upper end and the lower end of the electrode assembly 10 more firmly. Therefore, even when the electrode assembly 10 swells due to an external shock such as a drop or collision, the fixing tape 40 can firmly fix the electrode assembly 10, thereby ensuring the safety of the secondary battery 100 (see FIG. 1). Can be further improved.

Therefore, the fixing tape 40 of the embodiments of the present invention changes the arrangement of the adhesive part 47 and the inlet part 48 in accordance with the demand for improving the performance of the secondary battery 100 or improving the safety of the secondary battery 100. It can meet the above demand.

7 is a plan view showing a fixing tape of a third modification applied to the electrode assembly of the embodiments of the present invention, Figure 8 is a plan view showing a fixing tape of the fourth modification applied to the electrode assembly of the embodiments of the present invention.

7 and 8, in the third modified example and the fourth modified example, the inlet portion 48 of the fixing tape 40 may be formed to be opened. That is, the electrolyte injected through the electrolyte injection hole 36 (see FIG. 1) may be directly introduced into the electrode assembly 10 through the opened inlet 48.

The electrolyte may flow into the electrode assembly 10 by passing through the fixing tape 40 to which the OPS film is not attached. However, inflow efficiency of the electrolyte into the electrode assembly 10 through the opened inlet portion 48 may be increased. Is improved. Therefore, the inlet part 48 can be formed to be opened.

The opening inlet 48 may be formed to have a narrow width and a long length. That is, a plurality of inlet portions 48 having a large aspect ratio may be disposed along the width of the electrode assembly 10.

In addition, the opening inlet 48 may be formed as a rhombus as well as a rectangle. When formed with a rhombus, it is possible to form a larger opening in the center portion while maintaining the durability and adhesive strength of the fixing tape 40, it may be more advantageous to flow the electrolyte into the electrode assembly (10).

In addition, the adhesive part 47 may be formed around the opening of the inlet part 48 and may be formed in the entire area of the fixing tape 40.

9, the adhesive part 47 and the inlet part 48 of the fixing tape 40 may be formed in a mesh shape. At this time, the inlet 48 may be open or may be blocked. However, opening as described above is more advantageous for introducing the electrolyte.

The adhesive part 47 may be attached to the electrode assembly 10 around the inlet part 48. Due to the bonding portion 47 bonded like a mesh structure, the fixing tape 40 may more easily maintain the elastic force and the bonding force.

Through the mesh structure, the inlet portion 48 may be formed as large as possible in the area of the fixing tape 40, and at the same time, the electrode assembly 10 may be firmly fixed to improve the performance and safety of the secondary battery 100.

10 is a plan view showing a fixing tape of the sixth modification applied to the electrode assembly of the embodiments of the present invention, Figure 11 is a plan view showing a fixing tape of the seventh modification applied to the electrode assembly of the embodiments of the present invention, 12 is a plan view showing a fixing tape of an eighth modification applied to the electrode assembly of the embodiments of the present invention.

10 to 12, the hollow part 47b to which the adhesive material is not attached may be further included in the adhesive part 47 of the fixing tape 40. As described above, the electrolyte cannot pass through the adhesive portion 47. Therefore, the hollow portion 47b may be formed in the adhesive portion 47 to improve the inflow of the electrolyte while maintaining the bonding force.

The adhesive layer 47a generates the adhesive layer 47a due to the hollow portion 47b. That is, the adhesive part 47 may include the hollow part 47b and the adhesive layer 47a. The adhesive part 47 may be formed in a circular or polygonal shape. In addition, the hollow portion 47b may also be formed in a circular or polygonal shape.

The shape of the adhesive layer 47a is determined by the hollow portion 47b formed inside the adhesive portion 47. Since the adhesive layer 47a has a great influence on forming the bonding force between the fixing tape 40 and the electrode assembly 10, the shape of the adhesive portion 47 and the hollow portion 47b is very much related to the bonding force of the fixing tape 40. Have a significant impact.

When the adhesive part 47 is formed in a circular shape, the hollow part 47b may be formed in a circular or polygonal shape. That is, when the adhesive part 47 is formed in a circular shape and the hollow part 47b is also formed in a circular shape, the adhesive layer 47a may be formed in a circular shape. The adhesive layer 47a forms a circular adhesive layer 47a having a hollow center like a donut. The electrolyte may flow into the electrode assembly 10 through the hollow portion 47b. The size of the adhesive layer 47a is determined according to the size of the hollow portion 47b, and thus the bonding force of the fixing tape 40 is determined. On the contrary, when the adhesive part 47 is formed in a circular shape, the hollow part 47b may be formed in a polygon. According to the type of the electrolyte, it is to implement the hollow portion 47b to be more easily introduced into the electrode assembly 10. As the size of the secondary battery 100 (refer to FIG. 1) decreases, the portion of the electrode assembly 10 which is not impregnated with the electrolyte increases, which greatly affects the performance of the secondary battery 100. Therefore, the performance of the secondary battery 100 may be maintained by maintaining the electrode assembly 10 so as to be impregnated in the electrolyte as much as possible through the deformation of the hollow portion 47b.

In addition, when the adhesive part 47 is formed in a polygon, the hollow part 47b may be formed in a circular shape. In this case, the adhesive layer 47a may be formed in a square having an empty center. If the adhesive portion 47 is formed in a rectangular shape, there is a risk that stress may be concentrated in the corner portion, but the area of the adhesive layer 47a can be secured most efficiently, and the electrolyte flows into the electrode assembly 10 while maintaining the bonding force. It is more advantageous.

Although the present invention has been described through the preferred embodiments as described above, the present invention is not limited thereto and various modifications and variations are possible without departing from the spirit and scope of the claims set out below. Those in the technical field to which they belong will easily understand.

Description of the sign

100: secondary battery 10: electrode assembly

11: first electrode 11a: first electrode tab

12: second electrode 12a: second electrode tab

13: separator 20: case

30: cap assembly 31: cap plate

32: first terminal 32b: upper insulating member

34: second terminal 34b: connecting member

35 vent hole 36 electrolyte injection hole

40: fixing tape 42: upper fixing tape

44: center part fixing tape 46: lower part fixing tape

47: bonding portion 47a: adhesive layer

47b: hollow portion 48: inlet portion

Claims

An electrode assembly formed by winding a separator interposed between the first electrode and the second electrode;

A case containing the electrode assembly; And

Fixed to the outer surface of the electrode assembly to maintain the wound state of the electrode assembly, the adhesive material is attached to the adhesive portion adhering to the outer surface of the electrode assembly and formed adjacent to the adhesive portion, inflow spaced apart from the electrode assembly Secondary battery comprising a fixed tape consisting of a portion.
The method of claim 1,

The fixing tape,

An end tape adhered to an end of the electrode assembly; And

A secondary battery comprising a central tape attached to the first surface of the electrode assembly while fixing the winding end of the wound first electrode and the second electrode.
The method of claim 2,

The end tape,

And a secondary battery bonded over the first surface of the electrode assembly and a second surface opposite to the first surface.
The method of claim 3, wherein

The end tape,

The secondary battery is formed longer on the second surface than the first surface.
The method of claim 1,

The inlet is spaced apart from the electrode assembly by the thickness of the adhesive material.
The method of claim 1,

The fixing tape is a secondary battery having an elastic force.
The method of claim 1,

The fixing tape is a secondary battery made of a mesh form.
The method of claim 1,

Secondary battery is formed by opening the inlet portion.
The method of claim 8,

The inlet is a secondary battery disposed in the width direction of the electrode assembly.
The method of claim 9,

The inlet is a secondary battery formed in a circular or polygonal.
The method of claim 1,

The adhesive part is a secondary battery formed uniformly over the entire area of the fixed tape.
The method of claim 1,

The adhesive part is a secondary battery formed in a portion of the fixing tape.
The method of claim 11,

The adhesive part includes a hollow part formed in the center.
The method of claim 13,

The adhesive part is a secondary battery formed in a circular or polygonal.
The method of claim 13,

The hollow part secondary battery is formed in a circular or polygonal.