KR20070097853A - Lithium rechargeable battery and method of making the same - Google Patents

Abstract

A lithium secondary battery is provided to realize improved sealability at an electrolyte inlet by using a sealant, to show a clean outer shape, and to prevent the separation of the sealant during cleaning. A lithium secondary battery comprises: an electrode assembly including a cathode plate, an anode plate and a separator interposed between the cathode plate and the anode plate; a can having a top opening through which the electrode assembly is inserted and received therein; and a cap assembly for sealing the top opening, which is equipped with a cap plate(240) having an electrolyte inlet(242) formed at one side thereof, wherein the electrolyte inlet has a step portion(243,245) formed on the inner surface thereof.

Description

Lithium secondary battery and method of manufacturing the same {Lithium rechargeable battery and Method of making the same}

1A is an exploded perspective view of a typical lithium secondary battery

FIG. 1B is an enlarged cross-sectional view of the cap plate of FIG. 1A

2 is a vertical cross-sectional view of a lithium secondary battery according to an embodiment of the present invention.

Figure 3a is an enlarged cross-sectional view of the cap plate of Figure 2

Figure 3b is an enlarged cross-sectional view of the cap plate according to another embodiment of the present invention

4 is a flowchart of a method of manufacturing a lithium secondary battery according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

200-Lithium Secondary Battery 210-Can

212-Electrode Assembly 220-Cap Assembly

240, 340-Cap plate 241, 341-Terminal hole 1

242, 342-electrolyte inlet 243, 343-first side wall

245, 345-Second side wall 246, 346-Connections

280, 380-Ball

The present invention relates to a lithium secondary battery and a method of manufacturing the same, and more particularly, by forming a step inside the electrolyte inlet, applying a sealing agent to form a film, and then performing ball press injection, thereby improving sealing performance. It relates to a lithium secondary battery having a clean appearance and a method of manufacturing the same.

In general, as the light weight and high functionality of portable wireless devices such as a video camera, a portable telephone, a portable computer, and the like progress, a lot of researches have been conducted on secondary batteries used as driving power. Such secondary batteries include, for example, nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries are rechargeable, compact, and large-capacity, and are widely used in advanced electronic devices because of their high operating voltage and high energy density per unit weight.

1A is an exploded perspective view of a general lithium secondary battery, and FIG. 1B is an enlarged cross-sectional view of the cap plate of FIG. 1A.

Referring to FIG. 1, the lithium secondary battery 100 includes an electrode assembly 112 including an anode plate 113, an anode plate 115, and a separator 114 together with an electrolyte in a can 110. The top opening 110a of the can 110 is formed by sealing the cap assembly 120.

The can 110 is generally formed of aluminum or an alloy thereof, and manufactured by a deep drawing method. The lower surface 110b of the can 110 is generally formed in a substantially planar shape.

The electrode assembly 112 is formed by winding a separator 114 between the positive electrode plate 113 and the negative electrode plate 115. The positive electrode tab 113 is coupled to the positive electrode tab 116 to protrude to the upper end of the electrode assembly 112, and the negative electrode plate 115 is coupled to the negative electrode tab 117 to protrude to the upper end of the electrode assembly 112. In the electrode assembly 112, the positive electrode tab 116 and the negative electrode tab 117 are formed to be separated by a predetermined distance to be electrically insulated. The positive electrode tab 116 and the negative electrode tab 117 are generally made of nickel metal.

The cap assembly 120 includes a cap plate 140, an insulation plate 150, a terminal plate 160, and an electrode terminal 130. The cap assembly 120 is coupled to a separate insulating case 170 to be coupled to the upper opening 110a of the can 110 to seal the can 110.

The cap plate 140 is formed of a metal plate having a size and shape corresponding to that of the upper opening 110a of the can 110. The terminal hole 1 (141) having a predetermined size is formed in the center of the cap plate 140, and when inserted into the terminal hole 1 (141), the electrode terminal (130) for the insulation of the electrode terminal 130 and the cap plate (140) The outer surface of the 130 is a tubular gasket tube 137 is coupled and inserted together. On the other hand, one side of the cap plate 140 is the electrolyte injection hole 142 is formed to a predetermined size. After the cap assembly 120 is assembled to the upper opening 110a of the can 110, electrolyte is injected through the electrolyte inlet 142, and the electrolyte inlet 142 is sealed by a separate sealing means. .

The electrode terminal 130 is connected to the negative electrode tab 117 of the negative electrode plate 115 or the positive electrode tab 116 of the positive electrode plate 113 to act as a negative electrode terminal or a positive electrode terminal.

The insulating plate 150 is formed of an insulating material such as a gasket and is coupled to the bottom surface of the cap plate 140. The insulating plate 150 has a terminal through-hole 2 151 into which the electrode terminal 130 is inserted at a position corresponding to the terminal through-hole 1 141 of the cap plate 140. A mounting groove 152 corresponding to the size of the terminal plate 160 is formed on the bottom surface of the insulating plate 150 so that the terminal plate 160 is seated.

The terminal plate 160 is generally formed of a nickel alloy, and is mounted on the bottom surface of the insulating plate 150. The terminal plate 160 is provided with a terminal through hole 3 161 into which the electrode terminal 130 is inserted at a position corresponding to the terminal through hole 1 141 of the cap plate 140, and the electrode terminal 130. Is insulated by the gasket tube 137 and coupled through the terminal through-hole 1 141 of the cap plate 140, so that the terminal plate 160 is electrically insulated from the cap plate 140 while the electrode terminal 130 is insulated from the cap plate 140. Is electrically connected).

The negative electrode tab 117 coupled to the negative electrode plate 115 is welded to one side of the terminal plate 160, and the positive electrode tab 116 coupled to the positive electrode plate 113 is welded to the other side of the cap plate 140. . Resistance welding, laser welding, or the like is used as a welding method for coupling the negative electrode tab 117 and the positive electrode tab 116, and resistance welding is generally used.

The insulating case 170 is responsible for the insulation between the cap assembly 120 and the electrode assembly 112.

Referring to FIG. 1B, the electrolyte injection hole 142 has a taper 144 formed at an inlet, and has a vertical cross-sectional shape having a substantially Y shape. At this time, the sealing agent (S) is applied to the electrolyte injection hole 142 by the injection means (N) to improve the sealing. The electrolyte injection hole 142 is pressed and welded to a soft metal ball after the applied sealing agent S is dried. When the sealing agent S is applied, there is a problem that the electrolyte injection hole 142 overflows to the surface of the cap plate 140 because there is no space for the applied sealing agent S to accumulate. In addition, the electrolyte inlet 142 has a problem that the taper 144 is formed at the inlet so that the sealing agent S does not form a film properly on the inner surface of the electrolyte inlet 142 and flows down. In addition, the portion overflowing to the surface of the cap plate 140 of the applied and dried sealing agent (S) should be removed by cleaning, at this time the sealing agent formed on the taper 144 at the time of removal of the overflowing sealing agent (S) There is a problem that can be eliminated up to (S).

The present invention has been made to solve the above problems, in particular, by forming a step inside the electrolyte inlet and applying a sealing (sealing) to form a film, and then performing a ball press injection, the sealing performance is improved and a cleaner appearance Eggplant has a purpose to provide a lithium secondary battery and a method of manufacturing the same.

In order to solve the above problems, the lithium secondary battery of the present invention includes an electrode assembly having a positive electrode plate and a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate, and the electrode assembly is inserted into the upper opening and accommodated; In the lithium secondary battery having a cap plate having an electrolyte inlet formed on one side and sealing the top opening of the can, the electrolyte inlet is characterized in that the step is formed on the inner surface.

In addition, the step may be made by a first side wall that meets the top surface of the cap plate and a second side wall that meets the bottom surface of the cap plate.

In addition, the inner diameter of the first side wall is preferably formed to be larger than the inner diameter of the second side wall. The first side wall and the second side wall may be formed in any one of a cylindrical shape, an elliptic cylinder shape, and a rectangular box shape.

In addition, the inner surface of the electrolyte inlet may be coated with a coating. In addition, the coating may be made of a plastic or rubber material.

In addition, the first side wall portion is preferably formed with a height of 10% to 40% of the cap plate thickness.

In addition, the lithium secondary battery manufacturing method of the present invention comprises an electrolyte injection hole forming step of forming an electrolyte injection hole having a step on the inner surface of the cap plate; A film forming step of forming a plastic or rubber film on an inner surface of the electrolyte injection hole; And a ball indentation / welding step of injecting and welding the electrolyte injection hole into a metal ball.

At this time, the film forming step is a sealing agent coating step of applying a sealing agent to the electrolyte injection hole; A sealant solidification step of solidifying the applied sealant; And a sealing agent cleaning step of removing the sealing agent on the upper surface of the cap plate among the sealing agents. In addition, the sealing agent cleaning step may be made by a nonwoven fabric.

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

First, a lithium secondary battery according to an embodiment of the present invention will be described.

2 is a vertical cross-sectional view of a rechargeable lithium battery according to one embodiment of the present invention. 3A is an enlarged cross-sectional view of the cap plate of FIG. 2.

In the lithium secondary battery 200 according to an embodiment of the present invention, referring to FIG. 2, the electrode assembly 212 including the positive electrode plate 213, the negative electrode plate 215, and the separator 214 may be filled with an electrolyte ( And the upper end opening of the can 210 with the cap assembly 220. The lithium secondary battery 200 includes a long side and a front surface and a rear surface formed to face each other, a short side, and both sides formed to face each other, a top surface on which the cap plate 240 is located and a bottom surface facing the top surface. It is made, including.

The electrode assembly 212 is formed by winding a separator 214 between the positive electrode plate 213 and the negative electrode plate 215.

The positive electrode plate 213 includes a positive electrode current collector made of a thin metal plate having excellent conductivity, for example, aluminum (Al) foil, and a positive electrode active material layer coated on both surfaces thereof. Lithium oxides, such as LiCoO2, LiMn2O4, LiNiO2, LiMnO2, are used as the said positive electrode active material. At both ends of the positive electrode plate 213, a positive electrode current collector region in which a positive electrode active material layer is not formed, that is, a positive electrode non-coating portion is formed. One end of the positive electrode non-coating portion is generally formed of aluminum (Al), and the positive electrode tab 216 protruding a predetermined length to the upper portion of the electrode assembly 212 is bonded.

The negative electrode plate 215 includes a negative electrode current collector made of a conductive metal thin plate, for example, copper (Cu) or nickel (Ni) foil, and a negative electrode active material layer coated on both surfaces thereof. Both ends of the negative electrode plate 215 are provided with a negative electrode current collector region, that is, a negative electrode non-coating portion, in which a negative electrode active material layer is not formed. One end of the negative electrode non-coating portion is generally formed of nickel (Ni) material, and a negative electrode tab 217 protruding a predetermined length to the lower portion of the electrode assembly 212 is bonded. In addition, an insulating plate 218 for preventing contact with the can 210 may be further included below the electrode assembly 212.

The separator 214 is interposed between the positive electrode plate 213 and the negative electrode plate 215 and may extend to surround the outer circumferential surface of the electrode assembly 212. The separator 214 is formed of a porous membrane polymer material to prevent short circuit between the positive electrode plate 213 and the negative electrode plate 215 and to allow lithium ions to pass therethrough.

The can 210 is formed in a substantially box shape including a pair of long side walls having a substantially rectangular shape, a pair of short side walls and a bottom plate, and an upper portion thereof is opened to form an upper opening portion. In addition, when the can 210 is formed in a substantially box shape, the cross section in the horizontal direction may be formed in various shapes such as a rectangular shape or an elliptical shape. The electrode assembly 212 is inserted into the upper opening. In addition, an electrolyte solution is impregnated between the electrode assemblies 212 to enable the movement of lithium ions. The material of the can 210 is mainly light aluminum (Al), and the material of the can 210 is not limited thereto. The upper portion of the can 210 is sealed by the cap assembly 220, the leakage of the electrolyte is prevented. The long side walls and the short side walls of the can 210 are formed to have a thickness of about 0.2 to 0.4 mm, and the thickness of the bottom plate is approximately 0.2 to 0.7 mm. However, the thickness of the long side wall, the short side wall and the lower plate is not limited thereto. The can 210 is preferably formed by a deep drawing method, and the long side wall, the short side wall and the bottom plate are integrally formed. However, the method of forming the can 210 is not limited thereto.

The cap assembly 220 includes a cap plate 240, an insulating plate 250, a terminal plate 260, and an electrode terminal 230. The cap assembly 230 is coupled to a separate insulating case 270 to be coupled to the upper opening of the can 210 to seal the can 210.

The cap plate 240 is welded to the upper opening of the can 210 to seal the can 210. The cap plate 240 has an electrolyte injection hole 242 formed at one side thereof, and the electrolyte injection hole 242 is press-fitted and welded with a ball 280 or the like. The terminal hole 1 241 is formed in the center of the cap plate 240, and the electrode terminal 230 insulated by the gasket tube 246 is inserted into the terminal hole 1 241. Detailed description of the electrolyte injection hole 242 will be described later.

The insulating plate 250 is formed of an insulating material such as a gasket, and is coupled to the bottom surface of the cap plate 240. The insulating plate 250 has a terminal through-hole 2 through which the electrode terminal 230 is inserted at a position corresponding to the terminal through-hole 1 241 of the cap plate 240. A mounting groove corresponding to the size of the terminal plate 260 is formed on the bottom surface of the insulating plate 250 so that the terminal plate 260 is seated.

The terminal plate 260 is generally formed of Ni alloy, and is mounted on the bottom surface of the insulating plate 250. The terminal plate 260 is provided with a terminal through-hole 3 through which the electrode terminal 230 is inserted at a position corresponding to the terminal through-hole 1 241 of the cap plate 240, and the electrode terminal 230 is formed in the gasket. The terminal plate 260 is electrically insulated from the cap plate 240 while being electrically insulated from the cap plate 240 while being insulated by the tube 246 and coupled to the terminal through hole 1 241 of the cap plate 240. Is connected.

The negative electrode tab 217 coupled to the negative electrode plate 215 is welded to one side of the terminal plate 260, and the positive electrode tab 216 coupled to the positive electrode plate 213 is welded to the other side of the cap plate 240. . Resistance welding, laser welding, or the like is used as a welding method for coupling the negative electrode tab 217 and the positive electrode tab 216, and resistance welding is generally used.

The electrode terminal 230 is connected to the negative electrode tab 217 of the negative electrode plate 215 or the positive electrode tab 216 of the positive electrode plate 213 to act as a negative electrode terminal or a positive electrode terminal.

Referring to FIG. 3A, the electrolyte injection hole 242 is formed at one side of the cap plate 240. A sealing film 248 is formed on an inner surface of the electrolyte injection hole 242, and is pressed and welded to a soft metal ball 280 to be sealed. The welding is typically made by laser welding, and the ball 280 is made around the electrolyte injection hole 242 is pressed. Although not shown, after the welding is finished, a photocurable material may be applied around the electrolyte injection hole 242 including the ball 280 to prevent leakage of the electrolyte.

An inner surface of the electrolyte injection hole 242 includes a first side wall 243, a second side wall 245, and a connection part 246.

The first side wall 243 is formed on the electrolyte injection hole 242 so as to meet the top surface of the cap plate 240. The lower end of the first side wall 243 is formed to meet the connecting portion 246. The first side wall 243 may be formed to be substantially perpendicular to the top surface of the cap plate 240. This is because when the first side wall 243 is formed to have a gentle inclination, the sealing film 248 may not be coated because the first side wall 243 flows down quickly in a downward direction when the sealing agent is applied. However, the angle formed by the upper surface of the first side wall 243 and the cap plate 240 is not limited thereto. The first side wall 243 preferably has a vertical cross-sectional shape of 11 characters, and preferably has a planar shape of one of a circular shape, an elliptical shape, and a rectangular shape. As a result, the first side wall 243 is preferably formed of any one of a cylindrical shape, an elliptic cylinder shape, and a rectangular box shape. However, the shape of the first side wall 243 is not limited thereto. In addition, the inner diameter of the first side wall 243 is preferably larger than the inner diameter of the second side wall 245. Since the first side wall 243 is an inlet through which the electrolyte is injected, the first side wall 243 is largely formed for smooth injection. In addition, since the first side wall 243 and the second side wall 245 form a step, they are formed to have an inner diameter difference. In addition, the first side wall 243 is preferably formed to a height of 10% to 40% of the thickness of the cap plate 240. When the height of the first side wall 243 is less than 10% of the thickness of the cap plate 240, the ball 280 is not easily press-fitted and the ball 280 is popped up again, and the injection of the electrolyte becomes difficult. However, there is a problem that the applied sealant will overflow. On the other hand, if the height of the first side wall (243) is formed to exceed 40% of the thickness of the cap plate 240, the support force is insufficient when the ball 280 is press-fitted so that the portion of the electrolyte injection hole 242 is deformed downward There is a problem that can be.

The second side wall 245 is formed under the electrolyte injection hole 242 to meet the lower surface of the cap plate 240. In addition, a lower end of the second sidewall 245 is formed to meet the connection part 246. The second side wall 245 may be formed to be substantially perpendicular to the bottom surface of the cap plate 240. This is because if the first side wall 243 is formed to have a gentle inclination, the space into which the electrolyte is injected into the battery is narrowed. However, the angle formed by the lower surface of the second side wall 245 and the cap plate 240 is not limited thereto. The second side wall 245 preferably has a vertical cross-sectional shape of 11 characters, and the planar shape is preferably formed of any one of a circular shape, an elliptical shape, and a rectangular shape. As a result, the second side wall 245 is preferably formed of any one of a cylindrical shape, an elliptic cylinder shape, and a rectangular box shape. However, the shape of the second side wall 245 is not limited thereto. In addition, the inner diameter of the second side wall 245 is preferably smaller than the inner diameter of the first side wall 243.

The connection part 246 is formed to meet the first side wall 243 and the second side wall 245. The connection part 246 is formed to form a substantially horizontal plane. The connection part 246 serves as a space in which the applied sealing agent is accumulated. In addition, even after the ball 280 is pressed, most of the sealing film 248 remains on the connection part 246.

The sealing film 248 is formed on the inner surface of the electrolyte injection hole 242, in particular in most of the connection portion 246. The sealing film 248 is formed by applying a sealing agent in a liquid state to the inner surface of the electrolyte injection hole 242 as an injection means and then drying. The sealing film 248 is preferably made of a plastic or rubber material. The sealing film 248 is formed to improve the sealing property between the metal cap plate 240 and the metal ball 280. More preferably, the sealing film 248 is made of a rubber material having excellent elasticity. However, the material of the sealing film 248 is not limited thereto.

Next, a lithium secondary battery according to another embodiment of the present invention will be described.

3B is an enlarged cross-sectional view of a cap plate according to another embodiment of the present invention. Since the embodiment of FIG. 3B is similar to the embodiment of FIG. 3A except that the connection part 346 is formed to be inclined, the description will be mainly focused on differences.

Lithium secondary battery according to another embodiment of the present invention is formed including an electrode assembly, a can and a cap assembly. Since the electrode assembly and the can have been sufficiently described in the embodiment of FIG. 3A, detailed description thereof will be omitted. The cap assembly includes a cap plate 340, an insulating plate, a terminal plate, and an electrode terminal.

Referring to FIG. 3B, the cap plate 340 has a terminal through hole 1 341 formed at a center thereof, and an electrolyte injection hole 342 is formed at one side thereof. The electrolyte injection hole 342 is formed to include a first side wall 343, a second side wall 345, and a connection part 346. In addition, the electrolyte injection hole 342 is formed with a sealing film 348 on the inner surface, it is sealed by the ball 380.

The first side wall 343 is formed to be larger than the inner diameter of the second side wall 345 and is formed in any one of a cylindrical shape, an elliptic cylinder shape, and a rectangular box shape. In addition, the first side wall 343 is preferably formed to have a height of 10% to 40% of the thickness of the cap plate 340. The second side wall 345 is also formed in any one of a cylindrical shape, an elliptic cylinder shape, and a rectangular box shape.

The connection part 346 is formed as an inclined surface that forms a predetermined angle with the top surface of the cap plate 340. Accordingly, the connection portion 346 has a valley formed at a portion that meets the first side wall 343. The vertical cross-sectional shape of the valley where the connecting portion 346 and the first side wall 343 meet may be formed in a V shape or a U shape. The bone acts as a space in which the applied sealant can accumulate. In addition, the goal is to ensure that even when the ball 380 is pressed in, the sealing film 348 can be kept in place without being pushed downward. Since the connection part 346 is formed in such a shape, the sealing property of the electrolyte injection hole 342 may be further improved.

Next, a method of manufacturing a lithium secondary battery according to an embodiment of the present invention will be described. Hereinafter, a method of manufacturing a lithium secondary battery according to the embodiment of FIG. 2 will be described as an example.

4 is a flowchart illustrating a method of manufacturing a lithium secondary battery according to an embodiment of the present invention.

In the method of manufacturing a lithium secondary battery according to an embodiment of the present invention, referring to FIG. 4, an electrode assembly 212 forming step of forming an electrode assembly 212 and an electrolyte injection hole 242 are formed in a cap plate 240. The electrolyte injection hole 242 forming step (S 1), the electrolyte injection step of injecting the electrolyte through the electrolyte injection hole 242, the sealing film 248 to form a plastic or rubber coating on the inner surface of the electrolyte injection hole 242 Forming step, it is formed including a ball 280 indentation / welding step (S 3) to seal the electrolyte inlet 242 with the ball 280. In addition, the forming of the sealing film 248 includes a sealing agent applying step S 2, a sealing agent solidifying step S 3, and a sealing agent cleaning step S 4. The electrode assembly 212 forming step, the electrolyte injection step and the ball 280 indentation / welding step (S 5) is similar to the manufacturing method of a typical lithium secondary battery, a detailed description thereof will be omitted.

The electrolyte injection hole 242 forming step (S 1) is a step of forming an electrolyte injection hole 242 having a step on the inner surface on one side of the cap plate 240. The electrolyte injection hole 242 forming step (S 1) is preferably made of a punching method by a press, it is not limited to the method of forming the electrolyte injection hole 242.

In the forming of the sealing film 248, first, a sealing agent applying step (S 2) of applying a sealing agent to the electrolyte injection hole 242 is performed. The sealing agent applying step (S 2) is a process of applying a liquid sealing agent to the periphery of the electrolyte injection hole 242 by an injection means such as a syringe or a nozzle. The applied sealant mainly accumulates in the connection 246. In the forming of the sealing film 248, the sealing agent may be removed from the upper surface of the cap plate 240 after the sealing agent solidification step S 3 for solidifying the applied sealing agent. Through the sealing agent cleaning step (S 4). At this time, the sealing agent cleaning step (S 4) is made of a nonwoven fabric. The electrolyte injection hole 242 is formed such that the first side wall 243 is formed substantially perpendicular to the upper surface of the cap plate 240, and there is a space for the sealing agent to accumulate so that the sealing agent formed on the inner surface of the electrolyte injection hole 242 does not fall off. do.

When the sealing film 248 is formed, the ball 280 is press-fitted and welded to seal the electrolyte injection hole 242.

As described above, the present invention is not limited to the specific preferred embodiments described above, and any person having ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Various modifications are possible, of course, and such changes are within the scope of the claims.

According to the lithium secondary battery and a method of manufacturing the same according to the present invention, by securing a space in which the sealing agent can be accumulated, the applied sealing agent can be prevented from spilling onto the upper surface of the cap plate and has an effect of ensuring a clean appearance.

In addition, according to the present invention, the sealing agent forms an coating on the surface of the connecting portion, thereby further improving the sealing property of the electrolyte injection hole.

In addition, according to the present invention there is an effect that can prevent the phenomenon that the sealing agent falls off during cleaning.

Claims (10)

An electrode assembly including a positive electrode plate and a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate, a can into which the electrode assembly is inserted into an upper opening, and a cap plate having an electrolyte injection hole formed on one side thereof. In the lithium secondary battery comprising a cap assembly for sealing the top opening, The electrolyte injection hole is a lithium secondary battery, characterized in that the step is formed on the inner surface. The method of claim 1, And the step is formed by a first side wall which meets the top surface of the cap plate and a second side wall which meets the bottom surface of the cap plate. The method of claim 2, The inner diameter of the first side wall is formed to be larger than the inner diameter of the second side wall lithium secondary battery. The method of claim 2, The first side wall and the second side wall is a lithium secondary battery, characterized in that formed in any one of a cylindrical shape, an elliptic cylinder shape, a rectangular box shape. The method of claim 1, The inner surface of the electrolyte inlet is a lithium secondary battery, characterized in that coated with a sealing film. The method of claim 5, The sealing film is a lithium secondary battery, characterized in that made of a plastic or rubber material. The method of claim 2, The first side wall is a lithium secondary battery, characterized in that formed with a height of 10% to 40% of the cap plate thickness. An electrolyte injection hole forming step of forming an electrolyte injection hole having a step on an inner surface of the cap plate; Sealing film forming step of forming a plastic or rubber film on the inner surface of the electrolyte injection hole; And And a ball pressing / welding step of pressing and welding the electrolyte injection hole into a metal ball. The method of claim 8, wherein the sealing film forming step A sealing agent applying step of applying a sealing agent to the electrolyte injection hole; A sealant solidification step of solidifying the applied sealant; And And a sealing agent cleaning step of removing the sealing agent on the upper surface of the cap plate among the sealing agents. The method of claim 9, The sealing agent cleaning step is a method of manufacturing a lithium secondary battery, characterized in that the non-woven fabric.

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