KR20080096164A - Rechargeable battery and manufacturing method thereof - Google Patents

Abstract

A secondary battery and a manufacturing method thereof are provided to simplify a process and to cut down the costs by omitting an insulating case and minimizing a bending process of the electrode tap. A secondary battery includes a can(110); an electrode assembly which is inserted into the can and has one or more electrode taps; a cap-plate(130) which is connected to the electrode tap to cover the can and is installed with an insulating member(140) preventing the flow of the electrode assembly.

Description

Secondary battery and its manufacturing method {RECHARGEABLE BATTERY AND MANUFACTURING METHOD THEREOF}

1 is a perspective view illustrating a rechargeable battery according to the present invention.

2 is an exploded perspective view illustrating a rechargeable battery according to the present invention.

3A is an exploded perspective view showing the cap plate of the secondary battery upside down, FIG. 3B is a perspective view illustrating a coupling relationship between the cap plate and the insulating member, and FIG. 3C is a side view illustrating the insulating member.

4 is a partially exploded perspective view illustrating a state in which a cap plate is separated from a can of a secondary battery according to the present invention.

5A is a cross-sectional view taken along the line 5a-5a of FIG. 1, FIG. 5B is a cross-sectional view taken along the line 5b-5b of FIG. 1, and FIG. 5C is a cross-sectional view taken along the line 5c-5c of FIG. 1.

6 is a flowchart illustrating a method of manufacturing a secondary battery according to the present invention.

7A to 7D illustrate a method of manufacturing a rechargeable battery according to the present invention.

FIG. 7A illustrates a state in which the first electrode tab and the second electrode tab are welded to the cap plate and the electrode terminal by using a welding member.

7B illustrates a state in which the cap plate is rotated in a substantially perpendicular direction by using the rotating member.

7C illustrates a state in which the cap plate is coupled to the cap by using the pressing member,

7D illustrates a state in which the cap plate is welded to the can using the welding member.

<Description of Symbols for Main Parts of Drawings>

100; Secondary battery according to the present invention

110; Can 111; Long side

112; Short side 113; Round edge

114; Bottom 115; Opening

120; Electrode assembly 121; First electrode plate

122; Separator 123; 2nd electrode plate

124; First electrode tab 125; Second electrode tab

130; Cap plate 131; Long side

132; Short side 133; Round edge

134; Through 135; Stock hole

136; Insulating gasket 137; Electrode terminals

138; Terminal plate 139; Insulation Plate

140; Insulation member 141; Front page

142; Second page 143; Page 3

144; 4th page 145; spin

The present invention relates to a secondary battery and a method of manufacturing the same, and more particularly, to a secondary battery and a method of manufacturing the same, which can simplify the manufacturing process and reduce the cost by omitting an insulating case and minimizing the bending process of the electrode tab.

In general, secondary batteries such as lithium ion batteries can be classified into rectangular batteries, cylindrical batteries, and pouch batteries according to their form. Among them, the prismatic battery includes a can of a hexahedral shape having one side open, an electrode assembly inserted into the can and charged and discharged at a predetermined voltage, an electrolyte injected into the can to allow lithium ions to move in the electrode assembly, A cap plate is electrically connected through the electrode tab to the electrode assembly while blocking the upper portion of the can so that the electrode assembly and the electrolyte solution do not flow out.

Such a method of manufacturing a secondary battery generally includes a process of inserting an electrode assembly into a can, a process of welding an electrode tab of the electrode assembly to a predetermined region of a cap plate, a process of bonding the cap plate to a can, and the cap plate. Through the process of injecting the electrolyte into the interior of the can through.

However, such a conventional secondary battery and its manufacturing method have a problem of complicating the manufacturing process, raising the manufacturing cost, and electrically shorting the electrode tab with an undesired area for several reasons as follows.

First, there is usually a certain free space between the electrode assembly and the cap plate so that various parts of the electrode tab or the cap plate can be located. Accordingly, when the assembly of the secondary battery is completed, the electrode assembly inside the can is moved. It can be severely flow in the up, down, left and right directions. Therefore, in order to prevent the flow of the electrode assembly up, down, left and right in the prior art, the insulating case is positioned between the electrode assembly and the cap plate. That is, the insulating case minimizes the clearance between the electrode assembly and the cap plate, so that the electrode assembly does not flow in the can in the up, down, left and right directions. Therefore, the secondary battery of the related art is further provided with the above insulating case, which increases the manufacturing cost and increases the manufacturing cost.

Second, when the insulating case is introduced as described above, the electrode tab cannot be directly welded to the cap plate. Therefore, a hole having a predetermined size is formed in the insulating case, and the electrode tab is to be welded to the cap plate while the electrode tab passes through the hole. Accordingly, there is a problem in the related art that a process for allowing the electrode tab to pass through the through hole of the insulating case is further required.

Third, as described above, the electrode tab having passed through the through hole of the insulating case is formed to have a relatively long length so that the electrode tab can be properly welded to a predetermined position of the cap plate. It is also necessary to bend several times to accommodate all of them. Furthermore, when the bending of the electrode tab is not performed correctly, an unwanted electrical short occurs with the electrode tab, the cap plate or the can, and thus the secondary battery does not operate normally.

The present invention is to overcome the above-mentioned problems, an object of the present invention is to omit the insulating case, to minimize the bending process of the electrode tab to simplify the process and reduce the cost and a manufacturing method thereof To provide.

Another object of the present invention is to provide a secondary battery and a method for manufacturing the same, which can prevent the electrical short with other components by minimizing the length and the number of bending of the electrode tab connected to the electrode terminal among the electrode tabs.

In order to achieve the above object, a secondary battery according to the present invention includes a can, an electrode assembly inserted into the can and at least one electrode tab, and blocking the can while being connected to the electrode tab. It may include a cap plate is provided with at least one insulating member to prevent the flow of.

Here, the cap plate is a flat plate having a long side and a short side, the insulating member may be installed on the short side of the cap plate.

In addition, the insulating member may be formed to have the same length as the short side length of the cap plate.

In addition, a pair of protrusions may be formed on the cap plate such that the insulating member is forcibly fitted.

In addition, the cap plate is in the form of a flat plate having a long side and a short side, the pair of projections may be installed on the short side of the cap plate.

In addition, the protrusion may be formed to a thickness smaller than the thickness of the insulating member.

The insulating member may further include a first surface in contact with the cap plate, a second surface in contact with the electrode assembly as a surface opposite to the first surface, and contact with the protrusion between the first surface and the second surface. It may include a third surface.

In addition, the insulating member may further have a fourth surface in close contact with the inner wall of the can along side portions of the second surface and the third surface.

In addition, the protrusion may be in close contact with the inner wall of the can.

In addition, the cap plate is in the form of a flat plate having a long side and a short side, the boundary region between the long side and the short side may be formed in at least one of the round or right angle form.

In addition, the cap plate may have an insulating gasket interposed therebetween to allow the electrode terminal to be coupled thereto.

In addition, at least one electrode tab may be connected to the electrode terminal.

In addition, the electrode tab may be bent in a "-" shape from the surface of the electrode terminal.

In addition, the electrode tab may be bent in a "-" shape from the surface of the cap plate.

In addition, in order to achieve the above object, a method of manufacturing a secondary battery according to the present invention includes an electrode tab welding step of inserting an electrode assembly having electrode tabs into a can and welding the electrode tabs to a cap plate provided with an insulating member. A cap plate rotating step of rotating the cap plate at an angle so that the electrode tab is bent, a cap plate pressing step of pressing the cap plate to couple the cap plate to the can, and welding the cap plate to the can. Cap plate welding may be included.

Here, in the electrode tab welding step, the electrode tab in an unbended state may be welded to the cap plate in a state where the cap plate is placed upright on the can.

The cap plate rotation step may rotate the cap plate at an angle to allow the electrode tab to be bent and at the same time allow the cap plate to lie in a horizontal direction on the can.

In addition, the cap plate pressing step may completely couple the cap plate to the can so that the insulating member pressurizes the electrode assembly.

As described above, the secondary battery and the method of manufacturing the same according to the present invention do not have a separate insulating case as in the prior art, and the electrode tab bending process can be omitted as many times as in the prior art, thereby simplifying the manufacturing process. The manufacturing cost can be reduced.

In addition, the secondary battery and the method of manufacturing the same according to the present invention as described above minimizes the length and the number of bending of the electrode tab welded to the electrode terminal of the electrode tab, so that it is not electrically shorted to the cap plate or can.

In addition, as described above, the secondary battery and the method of manufacturing the same according to the present invention not only prevent the flow phenomenon in the up, down, left and right directions by the insulating member coupled to the cap plate to press the electrode assembly, and the insulating member and the projection to which it is coupled. By coupling together to the can, the coupling force between the cap plate and the can is further improved.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

1 is a perspective view of a rechargeable battery 100 according to the present invention.

As shown, the secondary battery 100 according to the present invention includes a can 110 having a substantially hexahedron shape and a cap plate 130 covering an upper portion of the can 110. Of course, an electrode assembly (not shown) and an electrolyte (not shown) and the like are housed or infused in the can 110, which will be described in detail below.

The can 110 includes a pair of long sides 111 having a relatively large area and spaced apart from each other by a predetermined distance. In addition, short sides 112 are formed around both sides of the long side 111 and have a relatively small area and are connected to the long side 111. Further, a round edge 113 having a predetermined curvature is formed between the long side 111 and the short side 112. In addition, one side of the long side portion 111, the short side portion 112 and the round side portion 113 is formed with a bottom portion 114 to block the bottom of the can 110. Here, the round edge portion 113 formed in the boundary region between the long side portion 111 and the short side portion 112 is formed with a curvature equal to or similar to the winding curvature of the electrode assembly to be described later, so that the inside of the can 110 may be formed. It plays a role that almost no empty space exists. Of course, the boundary area between the long side portion 111 and the short side portion 112 may be formed in a right angle shape to facilitate processing of the can 110. However, the present invention does not limit the shape of the boundary region between the long side portion 111 and the short side portion 112.

The can 110 may be formed of any one selected from aluminum (Al), nickel (Ni) plated aluminum, steel (Fe), stainless steel (SUS), copper (Cu), copper alloy, or an equivalent thereof. It may be formed, it is not limited to the material of the can 110 in the present invention.

The cap plate 130 is coupled to an upper portion of the can 110 to prevent the electrode assembly, the electrolyte, and the like to be separated from the outside. That is, a cap plate 130 having a shape substantially similar to the bottom portion 114 is welded to the can 110 on the upper side opposite to the bottom portion 114 of the can 110. The cap plate 130 is coupled to the electrode terminal 137 with an insulating gasket 136 interposed to prevent electrical short. In addition, one side of the electrode terminal 137 of the cap plate 130, the injection hole 135 is formed so that the electrolyte can be injected. Of course, the ball hole 135a is coupled and laser-welded to prevent the leakage of the electrolyte. In addition, a safety vent may be further formed in a predetermined region of the cap plate 130 to reduce the internal pressure of the battery 100 while rupturing outward when the internal pressure of the can 110 rises due to a relatively thin thickness. However, such a safety vent is not shown in the drawings because it may be formed in the can 110.

Here, the cap plate 130, like the can 110, aluminum (Al), nickel (Ni) plated aluminum, steel (Fe), stainless steel (SUS), copper (Cu), copper alloy (Cu alloy) ) Or an equivalent thereof may be formed, and the material of the cap plate 130 is not limited in the present invention.

2 is an exploded perspective view of a rechargeable battery 100 according to the present invention.

As shown, the can 110 having the long side 111, the short side 112, the round side 113, and the bottom 114 has an electrode assembly 120 in a direction opposite to the bottom 114. An opening 115 is formed to be inserted.

In addition, the electrode assembly 120 coupled to the inside of the can 110 through the opening 115 is slightly smaller than the height of the can 110 to secure an assembly space of the cap plate 130. It is wound up in the form of a jelly roll having a long side 120a, a short side 120b and a round side 120c. Here, the curvature of the round side 120c of the electrode assembly 120 is similar to or the same as the curvature of the round side portion 113 of the can 110, whereby the round side 120c of the electrode assembly 120 and the There is almost no empty space between the round edges 113 of the can 110. Of course, the width of the long side 111 of the can 110 and the width of the long side 120a of the electrode assembly 120, the width of the short side 112, and the width of the short side 120b are similar to each other. Or the same.

The electrode assembly 120 is wound a plurality of times while the first electrode plate 121, the separator 122, and the second electrode plate 123 are stacked in an outward to inward direction. Here, since the can 110, the cap plate 130, and the first electrode plate 121 may have the same polarity, the first electrode plate 121 may be positioned at the outermost portion. Of course, the first electrode plate 121 may be in direct electrical and mechanical contact with the inner wall of the can 110. In addition, the height of the separator 122 is actually slightly larger than the height of the first electrode plate 121 and the second electrode plate 123. That is, the separator 122 protrudes for a predetermined length through upper and lower ends of the first electrode plate 121 and the second electrode plate 123. Accordingly, the electrical short phenomenon that may occur at the top or bottom of the first electrode plate 121 and the second electrode plate 123 by the separator 122, the second electrode plate 123, the can 110, and the cap plate may occur. The electrical short phenomenon between the 130 is effectively prevented.

Here, the first electrode plate 121 may be a conventional aluminum foil (not shown), the surface of the first active material (for example, lithium cobalt (LiCoO ₂ ), lithium nickelate (LiNiO ₂₎ ), Lithium manganate (LiMn ₂ O ₄ ) or equivalents thereof, not shown in the figures) may be coated. In addition, the separator 122 may be polyethylene (PE) or polypropylene (PP), which is a porous material, to allow lithium ions to pass therethrough. Further, the second electrode plate 123 may be a copper foil (not shown in the figure), and a negative electrode active material (eg, graphite, carbon or equivalent thereof, not shown in the figure) may be coated on the surface thereof. have. Accordingly, the first electrode plate 121 generally has a positive electrode property, and the second electrode plate 123 has a generally negative electrode property. However, the metal type and the active material type of the first electrode plate 121 and the second electrode plate 123 are not limited thereto. That is, the first electrode plate 121 may be a cathode generally, and the second electrode plate 123 may be an anode generally.

In addition, a first electrode tab 124 which is connected to the first electrode plate 121 and extends a predetermined length to the outside in the upper direction of the electrode assembly 120 is formed. Of course, the insulating tape 124a for preventing electrical short may be adhered to the lower surface of the first electrode tab 124. In addition, a second electrode tab 125 connected to the second electrode plate 122 in an upward direction and extended to a predetermined length is also formed in an area spaced apart from the first electrode tab 124 by a predetermined distance. An insulating tape 125a is adhered to the lower surface of the second electrode tab 125 to prevent electrical short. Here, the position where the first electrode tab 124 and the second electrode tab 125 are formed is only one example, and the present invention is not limited to the positions shown in the drawings.

In addition, although not shown in the drawing, the insulating tape is adhered to the surface of the electrode assembly 120 to effectively suppress the loosening phenomenon of the electrode assembly 120, and also to the can 110 with the electrode assembly 120. Can be easily inserted.

Meanwhile, the cap plate 130 is generally positioned above the can 110 and the electrode assembly 120. Of course, the cap plate 130 serves to completely close the can 110. An insulating gasket 136 and an electrode terminal 137 are coupled to an upper portion of the cap plate 130, and a terminal plate 138 and an insulating plate 139 are positioned from a lower portion of the cap plate 130. . In addition, the cap plate 130 has a through hole 134 formed in the center thereof, such that the insulating gasket 136 and the electrode terminal 137 may be coupled to each other. In addition, the electrolyte injection hole 135 is formed at one side thereof, and the ball 135a is coupled to the injection hole 135 to be laser-welded. In addition, through holes 136a, 138a, and 139a are formed in the insulating gasket 136, the terminal plate 138, and the insulating plate 139, respectively, so that the electrode terminals 137 may be integrally coupled to each other. This cap plate 130 will be described in more detail below.

3A is an exploded perspective view showing the cap plate 130 upside down of the secondary battery 100 according to the present invention, and FIG. 3B is a perspective view illustrating a coupling relationship between the cap plate 130 and the insulating member 140. 3C is a side view illustrating the insulating member 140.

As shown, the cap plate 130 has a long side 131 and a short side 132 and is formed in a substantially rectangular flat plate shape. Of course, since the cap plate 130 should be coupled to the can 110 accurately, the round side 133 is formed in the region between the long side 131 and the short side 132. In addition, the insulating member 140 of a predetermined thickness is coupled to both short sides 132 of the cap plate 130. When the cap plate 130 is coupled to the can 110, the insulating member 140 strongly presses the electrode assembly 120 downward, thereby preventing the electrode assembly 120 from flowing upward, downward, leftward, and rightward. It plays a role. The insulating member 140 may be any material that is not conductive so that an electrical short between the electrode assembly 120 and other components does not occur, but it is possible to prevent the electrode assembly 120 from being damaged. It is good to use this good elastic material. For example, the electrode assembly 120 may be any one selected from polypropylene (PP), polyethylene (PE), polycarbonate (PC), and equivalents thereof, but the material is not limited thereto.

On the other hand, the cap plate 130 is formed with a pair of projections 145 having a predetermined length on the short side (132) side so that the insulating member 140 can be forcibly fitted. The protrusion 145 is the same material as the material of the cap plate 130, may be formed together with the processing of the cap plate 130, or may be attached to it after the processing of the cap plate 130 as a separate material. . In addition, the protrusion 145 may be the same thickness as the thickness of the insulating member 140, but may be formed smaller than the thickness of the insulating member 140 in order to prevent unnecessary electrical short with the electrode assembly 120. .

Subsequently, as shown in FIG. 3C, the insulating member 140 has a flat first surface 141 in contact with the cap plate 130 and the electrode assembly as an opposite surface of the first surface 141. The second flat surface 142 in contact with 120, the third flat surface 143 in contact with the protrusion 145 between the first surface 141 and the second surface 142, and the can ( A semicircular fourth surface 144 is in contact with the inner wall of the 110. Here, since the fourth surface 144 of the insulating member 140 actually contacts the inner wall (short side portion 112 and round side portion 113) of the can 110, it corresponds to the inner wall shape of the can 110. It is formed to be. That is, the second surface 142 defined by the fourth surface 144 is formed in a semicircle or half moon shape. Of course, when the cap plate 130 is formed in a substantially rectangular plate shape, it is a matter of course that the insulating member 140 is also formed in a rectangular shape.

4 is a partially exploded perspective view illustrating a state in which the cap plate 130 is separated from the can 110 of the secondary battery 100 according to the present invention.

As shown in the drawing, the height of the electrode assembly 120 is slightly smaller than the height of the can 110, and from the electrode assembly 120, the first electrode tab 124 and the second electrode tab 125 are directed upward. It extends a certain length. In addition, a predetermined region of the electrode terminal 137 is exposed through the terminal plate 138 coupled to the cap plate 130. As will be described below, the first electrode tab 124 is welded to the surface of the cap plate 130, and the second electrode tab 125 is welded to the electrode terminal 137 exposed through the terminal plate 138. Thus, for example, the cap plate 130 and the can 110 have a positive (or negative) characteristic, and the electrode terminal 137 has a negative (or positive) characteristic.

In addition, as described above, insulating members 140 are formed at both side short sides 132 (ie, short sides and round sides) of the cap plate 130, which presses the electrode assembly 120 downward. At the same time, it is in close contact with the inner wall of the can 110.

5A is a cross-sectional view taken along the line 5a-5a of FIG. 1, FIG. 5B is a cross-sectional view taken along the line 5b-5b of FIG. 1, and FIG. 5C is a cross-sectional view taken along the line 5c-5c of FIG. 1.

First, as illustrated in FIG. 5A, an insulating member 140 having a predetermined thickness is provided on the short side 132 of the cap plate 130, thereby strongly pressing the electrode assembly 120 under the cap plate 130. In addition, the insulating member 140 is also in close contact with the short side 112 of the can 110, thereby increasing the bonding force between the cap plate 130 and the can 110. In addition, a first electrode tab 124 is connected to the cap plate 130, and a second electrode tab 125 is connected to the electrode terminal 137. Here, although the second electrode tab 125 will be described later, the number and length of bendings are minimized, and thus the probability of electrically shorting the cap plate 130 or other components becomes very small.

In addition, an insulating gasket 136 is penetrated and coupled to the cap plate 130, and an electrode terminal 137 is penetrated and coupled to the insulating gasket 136. In addition, the insulating plate 139 is coupled to the insulating gasket 136 and the electrode terminal 137 and is in close contact with the surface of the cap plate 130. In addition, the terminal plate 138 is coupled to the electrode terminal 137 penetrating the insulating plate 139, and is in close contact with the surface of the insulating plate 139. In addition, one side of the cap plate 130, the injection hole 135 is formed, the injection hole 135 is sealed with a ball (135a).

Subsequently, as shown in FIG. 5B, the maximum width of the insulating member 140 is similar to or substantially the same as the width between the long sides 111 provided in the can 110. Therefore, the insulating member 140 is in close contact with the long side portion 111 provided in the can 110, thereby improving the coupling force between the cap plate 130 and the can 110. In fact, the insulating member 140 is in a state of being strongly adhered to the short side portion 112 and the round side portion 113 formed at the end of the long side portion 111 of the can 110, the long side portion of the can 110. It is only in close contact with the end portion region of the (111). In addition, the protrusion 145 fixing the insulating member 140 to the cap plate 130 is also in close contact with the distal region (ie, the round edge 113) of the long side 111 provided in the can 110. . Therefore, the coupling force between the cap plate 130 and the can 110 is further improved by the protrusion 145.

In addition, the second electrode tab 125 is connected to the electrode terminal 137 and at the same time bent from the surface of the second electrode tab 125 in a substantially "a" shape, the length of which is also very short. Therefore, the number and length of bending of the second electrode tab 125 are much smaller than in the related art, so that unnecessary electrical shorts with other components (for example, the can 110 and the cap plate 130) can be prevented. do. That is, the present invention not only reduces the number of parts, but also improves the coupling force between the can 110 and the cap plate 130 and also effectively prevents unnecessary electrical short.

Subsequently, as shown in FIG. 5C, the first electrode tab 124 is connected to the cap plate 130 and is bent in a substantially "A" shape from the surface thereof. However, the length is longer than that of the second electrode tab 125 and the number of bending is more. However, since the first electrode tab 124 has the same polarity as the can 110 and the cap plate 130, the first electrode tab 124 does not have a significant meaning in the length and the number of bending. Of course, although the first electrode tab 124 is formed on the right side of the electrode assembly 120 in the drawing, changing the design to the left side can minimize the length and the number of bending like the second electrode tab 125. . In the present invention, the forming position of the second electrode tab 125 is not limited and may be formed at a freezing position of the electrode assembly 120.

6 is a flowchart illustrating a method of manufacturing the secondary battery 100 according to the present invention.

As shown in the drawing, the manufacturing method of the secondary battery 100 includes an electrode tab welding step S1 of inserting an electrode assembly having electrode tabs into a can and welding the electrode tabs to a cap plate provided with an insulating member. A cap plate rotating step (S2) of rotating the cap plate at an angle to allow the electrode tab to be bent, a cap plate pressing step (S3) of pressing the cap plate to approximately couple the cap plate to the can, and Cap plate welding step (S4) for welding the cap plate to the can.

7A to 7D sequentially illustrate a method of manufacturing the rechargeable battery 100 according to the present invention. A method of manufacturing the rechargeable battery 100 according to the present invention will be described in more detail with reference to FIGS. 6 and 7A to 7D.

First, referring to FIG. 7A, an electrode tab welding step S1 of welding a first electrode tab and a second electrode tab to a cap plate and an electrode terminal using a welding member is illustrated.

As shown, using a welding member 151 such as a laser welder or a resistance welder, the first electrode tab 124 is welded to the surface of the cap plate 130, and the second electrode tab 125 is connected to the cap plate 130. ) Is welded to the surface of the electrode terminal 137 through. In this case, the cap plate 130 performs the welding operation while being positioned in an approximately erected form at the top of the can 110. Of course, at this time, the second electrode tab 125 is welded directly to the electrode terminal 137 in a state of being substantially unbent without being bent many times unlike the conventional art. In addition, the first electrode tab 124 is also welded to the cap plate 130 in a substantially unbent state. Of course, if the first electrode tab 124 is located on the rear side of the electrode assembly 120 differently from the drawing, it may be welded to the cap plate 130 in a substantially straight shape. In this case, the welding order of the first electrode tab 124 and the second electrode tab 125 may be changed, and in some cases, welding may be performed at the same time.

Next, referring to FIG. 7B, a cap plate rotating step S2 for rotating the cap plate in a substantially perpendicular direction using the rotating member is illustrated.

As shown, the rotation member 150 capable of holding the cap plate 130 by mutual movement in the X direction, lifting in the Y direction, and rotating the cap plate 130 by rotating the predetermined angle in the θ direction is provided. By rotating the cap plate 130 by a predetermined angle. Of course, by the operation of the rotating member 150, the cap plate 130 is positioned in the shape of lying about the upper portion of the can 110, that is, the electrode assembly 120. In addition, the second electrode tab 125 is naturally bent approximately once by the rotation step S2 of the cap plate 130. That is, the second electrode tab 125 is bent in a substantially "-" shape from the surface of the electrode terminal 137.

Next, referring to FIG. 7C, the cap plate pressing step S3 for pressing and coupling the cap plate to the can using the pressing member is illustrated.

As shown in the drawing, the cap plate 130 is pressed downward from the top of the can 110 by using the pressing member 152 having a substantially flat plate shape. By the pressing step (S3) of the cap plate 130, the cap plate 130, the insulating member 140, and the protrusion 145 are completely coupled to the can 110. Of course, at this time, the insulating member 140 strongly presses the lower electrode assembly 120 so that the electrode assembly 120 does not flow in the up, down, left, and right directions inside the can 110.

Finally, referring to FIG. 7D, a cap plate welding step S4 of welding a cap plate to a can using a welding member is shown.

As shown, the cap plate 130 is completely fixed to the can 110 by laser welding the boundary region between the cap plate 130 and the can 110 using the welding member 154. Of course, after the welding step of the cap plate 130, a predetermined amount of electrolyte is injected through the injection hole 135 formed in the cap plate 130, and then the injection hole 135 is viewed (not shown in the drawing). ), The manufacturing process of the secondary battery 100 according to the present invention is completed.

Meanwhile, the present invention has been described with reference to the square battery 100 in which a round edge portion 113 is formed between the long side portion 111 and the short side portion 112 of the can 110, but the present invention can be described as an example of the can 110. The long side portion 111 and the short side portion 112 of the rectangular battery of the bent form at right angles without the round side portion 113 can be applied as it is. Of course, in the case of the rectangular battery bent at a right angle, it is natural that the insulating member is formed in a substantially rectangular parallelepiped shape.

As described above, the secondary battery and the method of manufacturing the same according to the present invention do not have a separate insulated case as in the prior art, and can minimize the number of electrode tab bending processes as in the prior art, thereby simplifying the manufacturing process and It is effective to reduce manufacturing costs.

In addition, as described above, the secondary battery and the method of manufacturing the same according to the present invention minimize the length of the electrode tab welded to the electrode terminal among the electrode tabs and the number of bending, thereby minimizing the electric shortening of the cap plate or the can. It can be effective.

In addition, as described above, the secondary battery and the method of manufacturing the same according to the present invention not only prevent the flow phenomenon in the up, down, left and right directions by the insulating member coupled to the cap plate to press the electrode assembly, and the insulating member and the projection to which it is coupled. By being coupled to the can together, there is an effect that the bonding force between the cap plate and the can is further improved.

What has been described above is just one embodiment for carrying out the secondary battery and the manufacturing method according to the present invention, the present invention is not limited to the above-described embodiment, as claimed in the following claims Without departing from the gist of the present invention, those skilled in the art to which the present invention pertains to the technical spirit of the present invention to the extent that various modifications can be made.

Claims (18)

Cans, An electrode assembly inserted into the can and having at least one electrode tab; And a cap plate provided with an insulating member for blocking the can while being connected to the electrode tab and preventing flow of the electrode assembly. The secondary battery of claim 1, wherein the cap plate has a flat side having a long side and a short side, and the insulating member is provided at a short side of the cap plate. The secondary battery of claim 2, wherein the insulation member has a length equal to a length of a short side of the cap plate. The secondary battery of claim 1, wherein a pair of protrusions are formed on the cap plate such that the insulating member is forcibly fitted. The secondary battery of claim 4, wherein the cap plate has a flat side having a long side and a short side, and the pair of protrusions are provided at a short side of the cap plate. The secondary battery of claim 4, wherein the protrusion is formed to have a thickness smaller than the thickness of the insulating member. 5. The insulating member according to claim 4, wherein the insulating member has a first surface in contact with the cap plate, a second surface in contact with the electrode assembly as a surface opposite to the first surface, and between the first and second surfaces. And a third surface in contact with the protrusion. The secondary battery of claim 7, wherein the insulating member further comprises a fourth surface closely attached to an inner wall of the can along side portions of the second surface and the third surface. The secondary battery of claim 4, wherein the protrusion is in close contact with an inner wall of the can. The secondary battery of claim 1, wherein the cap plate has a long side and a short side, and a boundary region between the long side and the short side is formed in at least one of a round shape and a right angle shape. The secondary battery of claim 1, wherein an electrode gasket is penetrated through an insulating gasket in the cap plate. The secondary battery of claim 11, wherein at least one electrode tab is connected to the electrode terminal. The secondary battery of claim 12, wherein the electrode tab is bent in a "a" shape from a surface of the electrode terminal. The secondary battery of claim 1, wherein the electrode tab is bent in a "a" shape from the surface of the cap plate. An electrode tab welding step of inserting an electrode assembly having electrode tabs into the can and welding the electrode tabs to a cap plate provided with an insulating member; A cap plate rotating step of rotating the cap plate at an angle so that the electrode tab is bent; A cap plate pressurizing step of pressurizing the cap plate such that the cap plate is coupled to a can; And a cap plate welding step of welding the cap plate to the can. The method of claim 15, wherein the welding of the electrode tabs comprises welding the electrode tabs in an unbended state to the cap plate while the cap plate is vertically placed on the can. The method of claim 15, wherein the rotating the cap plate rotates the cap plate at an angle so that the electrode tab is bent and the cap plate is laid in the horizontal direction on the can. . The method of claim 15, wherein the pressing of the cap plate completely couples the cap plate to a can so that the insulating member pressurizes the electrode assembly.

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