KR20070108764A - Lithium rechargeable battery and method of making the same - Google Patents

Abstract

A lithium secondary battery is provided to improve shear strength of a hot melting part including a protection circuit board by simplifying the shape of a lead plate. A lithium secondary battery includes an electrode assembly, a can for accommodating the electrode assembly, and a cap assembly which comprises a cap plate(240) and seals a top opening of the can. A hot melting part including a protection circuit board is formed on the cap plate. An intaglio anchor(245) is formed on the one side of the cap plate. A support member(248) is inserted into the intaglio anchor. The cap plate has a terminal through hole(241) for a first electrode terminal in the center. An electrolyte inlet(242) is formed on the one side and a safety vent(243) is formed on the other side on the basis of the terminal through hole.

Description

Lithium rechargeable battery and method of making the same

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

Figure 2 is an exploded perspective view of a lithium secondary battery according to an embodiment of the present invention

3A is a plan view of a cap plate according to an embodiment of the present invention.

3B is a cross-sectional view taken along the line A-A of FIG. 3A

Figure 4 is a vertical cross-sectional view of the cap plate according to another embodiment of the present invention

Figure 5a is a plan view of a cap plate according to another embodiment of the present invention

FIG. 5B is a cross-sectional view taken along the line B-B in FIG. 5A

<Description of Symbols for Major Parts of Drawings>

200-Lithium Secondary Battery 210-Can

220-electrode assembly 230-cap assembly

240, 340, 440-Capplates 245, 345, 445-Engraved anchor

248, 348, 448-Support member 452-Embossed anchor

454-Auxiliary member

The present invention relates to a lithium secondary battery and a method of manufacturing the same, and more particularly, to form an anchor on the upper surface of the cap plate and then insert the support member in the intaglio anchor and simplify the shape of the lead plate protection circuit board It relates to a lithium secondary battery and a method for manufacturing the same that can improve the shear strength of the hot-melting portion comprising a.

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.

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

Referring to FIG. 1, the lithium secondary battery 100 receives an electrode assembly 120 including an anode plate 123, a cathode plate 125, and a separator 124 together with an electrolyte in a can 110. The upper end opening 110a of the can 110 is formed by sealing the cap assembly 130.

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 120 is formed by winding a separator 124 between the positive electrode plate 123 and the negative electrode plate 125. The positive electrode tab 126 is coupled to the positive electrode plate 123 to protrude to the upper end of the electrode assembly 120, and the negative electrode tab 127 is coupled to the negative electrode plate 125 to protrude to the upper end of the electrode assembly 120. In the electrode assembly 120, the positive electrode tab 126 and the negative electrode tab 127 are formed to be electrically separated from each other by a predetermined distance. The positive electrode tab 126 and the negative electrode tab 127 are generally formed of nickel metal.

The cap assembly 130 includes a cap plate 140, an insulating plate 160, a terminal plate 170, and an electrode terminal 135. Cap assembly 130 is coupled to a separate insulating case 180 is coupled to the top opening portion 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 plate hole 1 141 of a predetermined size is formed in the center of the cap plate 140, and when inserted into the terminal hole hole 1 (141), the electrode terminal (135) for insulation of the electrode terminal 135 and the cap plate 140 The tubular gasket tube 146 is coupled to the outer surface of the 135 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 130 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. . In addition, the other side of the cap plate 140, the safety vent 143 is formed in a predetermined size. The safety vent 143 is thinner than other portions of the cap plate 140 and is broken when the pressure inside the battery rises above the threshold.

The electrode terminal 135 is connected to the negative electrode tab 127 of the negative electrode plate 125 or the positive electrode tab 126 of the positive electrode plate 123 to act as a negative electrode terminal or a positive electrode terminal.

The insulating plate 160 is formed of an insulating material such as a gasket, and is coupled to the bottom surface of the cap plate 140. Insulating plate 160 is formed with a terminal through-hole 2 161 into which the electrode terminal 135 is inserted at a position corresponding to the terminal through-hole 1 141 of the cap plate 140. A mounting groove 162 corresponding to the size of the terminal plate 170 is formed on the bottom surface of the insulating plate 160 so that the terminal plate 170 is seated.

The terminal plate 170 is generally formed of a nickel alloy, and is mounted on the bottom surface of the insulating plate 160. The terminal plate 170 is provided with a terminal through hole 3 171 into which the electrode terminal 135 is inserted at a position corresponding to the terminal through hole 1 141 of the cap plate 140, and the electrode terminal 135. Is insulated by the gasket tube 146 and coupled through the terminal through hole 1 141 of the cap plate 140, so that the terminal plate 170 is electrically insulated from the cap plate 140 and the electrode terminal 135. Is electrically connected).

The negative electrode tab 127 coupled to the negative electrode plate 125 is welded to one side of the terminal plate 170, and the positive electrode tab 126 coupled to the positive electrode plate 123 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 127 and the positive electrode tab 126, and resistance welding is generally used.

The insulating case 180 is responsible for insulation between the cap assembly 130 and the electrode assembly 120, and the positive electrode tab hole 182 and the negative electrode tab hole 184 are formed.

Meanwhile, in the case of an inner pack type, a lithium secondary battery may have a hot melting part including a protective circuit board on an upper portion of a cap plate. The hot melt part is typically formed by injection molding, it is formed of a plastic material. In this case, the hot-melting part has a problem in that sufficient strength is not secured because the adhesion force with the cap plate is made of metal. In particular, since the hot melt part is vulnerable to shear stress, the protection circuit board and the cap plate are electrically disconnected by external force, or, in the case of severe hot melt part, the hot melt part is separated from the top of the cap plate.

The present invention has been made in order to solve the above problems, in particular, after forming an anchor on the top surface of the cap plate (anchor) by inserting the support member on the intaglio anchor and simplifying the shape of the lead plate comprising a protective circuit board An object of the present invention is to provide a lithium secondary battery and a method of manufacturing the same, which can improve shear strength of a hot melt part.

The lithium secondary battery of the present invention devised to solve the above problems is a lithium secondary battery comprising an electrode assembly, a can containing the electrode assembly, a cap plate and a cap assembly sealing the top opening of the can. In the battery, a hot melting part including a protective circuit board is formed on the cap plate, the cap plate is formed with a negative anchor (anchor) on one side, characterized in that the support member is fitted to the negative anchor. .

At this time, the cap plate may be formed with a terminal through-hole through which the first pole terminal is inserted, and an electrolyte injection hole is formed at one side with respect to the terminal through-hole, and a safety vent may be formed at the other side.

In addition, the engraved anchor may be formed on one side of the cap plate. In addition, the engraved anchor may be formed in any one of a rectangular shape, a circular shape, and an elliptical shape in a plane shape.

In addition, the support member may be formed in any one of a rectangular pillar shape, a cylinder shape, an elliptic cylinder shape to be in close contact with the intaglio anchor. In addition, the support member may be formed with at least one groove on the side. In addition, the support member is preferably formed in the height from the top surface of the cap plate 30% to 50% of the thickness of the hot melt portion.

In addition, an adhesive may be interposed between the intaglio anchor and the support member.

In addition, a second pole lead plate may be formed on an upper surface of the cap plate, and the second pole lead plate may have an L-shaped cross-sectional shape in a direction perpendicular to the long side of the cap plate.

In addition, the cap plate may be embossed anchor is formed on the other side. In addition, it is preferable that the auxiliary member is interposed between the embossed anchor and the hot melting portion. In addition, the auxiliary member is preferably formed of a plastic material. In addition, the auxiliary member may be attached to the embossed anchor with an adhesive. In addition, the auxiliary member may be formed with at least one groove on the side. In addition, the auxiliary member may be formed to have a step on the side.

In addition, the first electrode may be a cathode, and the second electrode may be formed to be an anode.

In addition, the method of manufacturing a lithium secondary battery according to the present invention comprises the steps of forming an intaglio anchor on the top side of the cap plate; A supporting member forming step of fitting a supporting member to the intaglio anchor; And a hot melting part forming step of forming a hot melting part on an upper portion of the cap plate.

At this time, it may be made by further comprising an adhesive coating step between the intaglio anchor forming step and the support member forming step. In addition, it may further comprise an embossed anchor forming step of forming an embossed anchor on the other side of the upper surface of the cap plate. In addition, after the embossed anchor forming step may further comprise an auxiliary support forming step of covering the embossed anchor with an auxiliary member made of plastic material.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, it is assumed that the first electrode is the cathode and the second electrode is the anode.

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

Figure 2 shows an exploded perspective view of a lithium secondary battery according to an embodiment of the present invention. Figure 3a shows a plan view of a cap plate according to an embodiment of the present invention, Figure 3b shows a cross-sectional view A-A of Figure 3a.

In the lithium secondary battery 200 according to an embodiment of the present invention, referring to FIG. 2, the electrode assembly 220 including the positive electrode plate 223, the negative electrode plate 225, and the separator 224 may be filled with an electrolyte ( And the upper end opening 210a of the can 210 is sealed with the cap assembly 230. 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. And 210b.

The electrode assembly 220 is formed by winding a separator 224 between the positive electrode plate 223 and the negative electrode plate 225.

The positive electrode plate 223 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 223, 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 226 protruding a predetermined length to the upper portion of the electrode assembly 220 is bonded.

The negative electrode plate 225 includes a negative electrode current collector made of a conductive metal 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 225 have 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), and the negative electrode tab 227 protruding a predetermined length to the lower portion of the electrode assembly 220 is bonded. In addition, a lower portion of the electrode assembly 220 may further include an insulating plate for preventing contact with the can 210.

The separator 224 may be interposed between the positive electrode plate 223 and the negative electrode plate 225 and extend to surround the outer circumferential surface of the electrode assembly 220. The separator 224 is formed of a porous membrane polymer material to prevent short circuit between the positive electrode plate 223 and the negative electrode plate 225 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 212 having a substantially rectangular shape, a pair of short side walls 213 and a bottom plate 210b, and an upper portion thereof is opened to open the upper opening. (210a). 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 220 is inserted into the upper opening 210a. In addition, an electrolyte solution is impregnated between the electrode assemblies 220 to enable the movement of lithium ions. The material of the can 210 is mainly light aluminum (Al). The upper portion of the can 210 is sealed by the cap assembly 230, the leakage of the electrolyte is prevented. The long side wall 212 and the short side wall 213 of the can 210 have a thickness of about 0.2 to 0.4 mm, and the thickness of the bottom plate 210b is about 0.2 to 0.7 mm. However, the thickness of the long side wall 212 and the short side wall 213 is not limited thereto. The can 210 is preferably formed by a deep drawing method, and the long side wall 212, the short side wall 213, and the bottom plate 210b are integrally formed. However, the method of forming the can 210 is not limited thereto.

The cap assembly 230 includes a cap plate 240, an insulating plate 260, a terminal plate 270, and an electrode terminal 235. The cap assembly 230 is coupled to a separate insulating case 280 is coupled to the upper opening 210a of the can 210 to seal the can 210. .

The cap plate 240 is welded to the upper opening 210a of the can 210 to seal the can 210. The cap plate 240 includes a terminal through hole 1 241, an electrolyte injection hole 242, a safety vent 243, an intaglio anchor 245, a support member 248, and an anode lead plate 250.

The terminal through hole 1 241 is formed in the center of the cap plate 240, and the negative electrode terminal 235 insulated by the gasket tube 246 is inserted therein.

The electrolyte injection hole 242 is formed at one side of the cap plate 240, and is pressed and welded with a soft metal ball (not shown) to be sealed. The welding is typically made by laser welding, and the ball is made around the electrolyte injection hole 242 is pressed. 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.

The safety vent 243 is formed at the other side of the cap plate 240, and is formed to a thinner thickness than other portions. The safety vent 243 may have an elliptical planar shape, but the safety vent 243 is not limited to the planar shape of the safety vent 243. In addition, the safety vent 243 may be formed by a compression method, and the safety vent 243 is not limited thereto. The safety vent 243 is damaged when the pressure inside the battery rises above a predetermined pressure to prevent ignition and explosion of the battery.

The intaglio anchor 245 is formed at one side or the other side of the cap plate 240, and is preferably formed at one side of the cap plate 240 like the electrolyte injection hole 242. More preferably, the intaglio anchor 245 is formed between the electrolyte injection hole 242 and one end of the cap plate 240. The engraved anchor 245 is installed to withstand the shear stress applied to the hot melting part (not shown) together with the support member 248. Therefore, the intaglio anchor 245 is preferably formed in the direction of one end of the cap plate 240 from the terminal through hole 1 (241) in terms of securing shear strength. The intaglio anchor 245 may be formed in any one of a rectangular shape, a circular shape, and an elliptical shape in a planar shape, but is not limited to the planar shape of the intaglio anchor 245. In addition, the intaglio anchor 245 may have a vertical cross-sectional shape in an angular U-shape, or a U-shape or a V-shape, and the vertical cross-sectional shape of the intaglio anchor 245 is not limited thereto. In addition, the intaglio anchor 245 is formed to a depth such that the support member 248 does not shake, and is preferably formed to be approximately 50% or more of the thickness of the cap plate 240. In addition, when the intaglio anchor 245 is formed in a substantially square shape, the length of one side is preferably formed to be about 1 mm to 2 mm, and when formed in a substantially circular shape, the length of the diameter is formed to be about 1 mm to 2 mm. It is desirable to be. However, the width or length or diameter of the intaglio anchor 245 is not limited thereto. In addition, the intaglio anchor 245 is preferably formed by a press method, and the intaglio anchor 245 is not limited to the formation method. In addition, when the intaglio anchor 245 is formed in a substantially square or rectangular shape, the corners are preferably rounded. Since the support member 248 is fitted to the intaglio anchor 245, the wear may be progressed by friction, and thus, the corner may be rounded. The intaglio anchor 245 is formed in a groove shape to fix the support member 248.

The support member 248 is fixed to the engraved anchor 245. At this time, the support member 248 is formed so that the horizontal cross-sectional shape corresponds to the planar shape of the intaglio anchor 245. That is, the support member 248 is formed in any one of a rectangular pillar shape, a cylinder shape, an elliptic cylinder shape so as to be in close contact with the intaglio anchor 245, but the limiting shape of the support member 248 is no. A portion of the support member 248 is inserted into the intaglio anchor 245, and the remaining portion is formed to protrude above the upper surface of the cap plate 240. The support member 248 preferably has a height from an upper surface of the cap plate 240 to be 30% to 50% of the thickness of the hot melt part. If the height of the support member 248 is formed to be less than 30% of the thickness of the hot melt part, the protruding portion of the support member 248 becomes too low, and thus there is a problem that the shear stress applied to the hot melt part may not be adequately endured. In addition, when the height of the support member 248 is formed to exceed 50% of the thickness of the hot-melting part, there is a problem that the top end of the support member 248 is caught by a protective circuit board (not shown) and thus assembly is not performed smoothly. . The support member 248 is manufactured by an extrusion method or a deep drawing method, but is not limited to the manufacturing method of the support member 248. The support member 248 may be inserted into the intaglio anchor 245 without a separate bonding means, but it is preferable to use an adhesive for more firm coupling. In addition, when the support member 248 is formed in a substantially square pillar shape or a rectangular pillar shape, it is preferable that corners are rounded like the intaglio anchor 245. The support member 248 is formed to protrude to the upper portion of the cap plate 240 serves to support the hot melt portion. Thus, the support member 248 is to strengthen the shear strength of the hot melt portion.

The anode lead plate 250 is formed on the upper surface of the cap plate 240, preferably is formed on one side of the cap plate 240. More preferably, the positive lead plate 250 is formed between the electrolyte injection hole 242 and the terminal through-hole 1 (241). An electrolyte injection hole 242 is formed at one side of the cap plate 240, and a safety vent 243 is formed at the other side. Since the electrolyte injection hole 242 is formed to have a smaller size than the safety vent 243, one side of the cap plate 240 may easily secure a space in which the anode lead plate 250 is to be formed. However, the present invention is not limited to the formation position of the anode lead plate 250, and the anode lead plate 250 may be formed on the other side of the cap plate 240. The anode lead plate 250 has an L-shaped cross-sectional shape in a direction perpendicular to the long side of the cap plate 240. That is, the anode lead plate 250 is formed of two planar portions that are substantially square to each other and are substantially perpendicular to each other. However, the vertical cross-sectional shape of the anode lead plate 250 is not limited thereto. In this case, one surface of the two planes is attached to the upper surface of the cap plate 240. The attachment is made by welding, preferably laser welding. However, the method of attaching the anode lead plate 250 is not limited thereto. Meanwhile, the other one of the two planes protrudes upwardly from the cap plate 240 while being substantially perpendicular to the top surface of the cap plate 240. The protruding portions are electrically connected to the positive terminal of the protective circuit board (not illustrated) by welding or the like. In addition, the anode lead plate 250 is formed of a metal material, and preferably is made of aluminum or nickel having excellent conductivity. However, the material of the anode lead plate 250 is not limited thereto. The anode lead plate 250 is formed in a simple shape to serve only as the anode terminal, and thus, the anode lead plate 250 may be easily manufactured, and the welding to the upper surface of the cap plate 240 may be more simple.

The insulating plate 260 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 260 is formed with a terminal through-hole 226 in which the electrode terminal 235 is inserted at a position corresponding to the terminal through-hole 1 241 of the cap plate 240. A mounting groove 262 corresponding to the size of the terminal plate 270 is formed on the bottom surface of the insulating plate 260 so that the terminal plate 270 is seated.

The terminal plate 270 is generally formed of Ni alloy, and is mounted on the bottom surface of the insulating plate 260. The terminal plate 270 is provided with a terminal through hole 3 271 in which the electrode terminal 235 is inserted at a position corresponding to the terminal through hole 1 241 of the cap plate 240, and the electrode terminal 235. Is insulated by the gasket tube 246 and coupled through the terminal through hole 1 241 of the cap plate 240, so that the terminal plate 270 is electrically insulated from the cap plate 240 while the electrode terminal ( 235) electrically.

The negative electrode tab 227 coupled to the negative electrode plate 225 is welded to one side of the terminal plate 270, and the positive electrode tab 226 coupled to the positive electrode plate 223 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 bonding the negative electrode tab 227 and the positive electrode tab 226, and resistance welding is generally used.

The electrode terminal 235 is connected to the negative electrode tab 227 of the negative electrode plate 225 or the positive electrode tab 226 of the positive electrode plate 223 to act as a negative electrode terminal or a positive electrode terminal.

The insulating case 280 is responsible for insulation between the cap assembly 230 and the electrode assembly 220, and a positive electrode tab hole 282 and a negative electrode tab hole 284 are formed.

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

4 is a vertical cross-sectional view of a cap plate according to another embodiment of the present invention. 4 is similar to the embodiment of FIG. 3B except that a plurality of grooves are formed on the side surface of the supporting member 348, and thus 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. 3B, detailed description thereof will be omitted.

The cap assembly includes a cap plate 340, an insulating plate, a terminal plate, and an electrode terminal. Since the insulation plate, the terminal plate, and the electrode terminal have been sufficiently described in the embodiment of FIG. 3B, detailed descriptions thereof will be omitted.

Referring to FIG. 4, the cap plate 340 includes a terminal through hole 1 341, an electrolyte injection hole 342, a safety vent 343, an intaglio anchor 345, a support member 348, and an anode lead plate 350. It is formed, including. The terminal through hole 1 341 is formed at approximately the center of the cap plate 340. In addition, the electrolyte injection hole 342, the intaglio anchor 345, the support member 348, and the anode lead plate 350 are formed at one side of the cap plate 340, and the safety band 343 is the cap plate. It is formed on the other side of the 340. However, the components formed on the cap plate 340 may be arranged differently.

The support member 348 has at least one groove 349 formed at a side thereof. The groove 349 is formed in plural and preferably a plurality of grooves are formed. In addition, the grooves 349 are preferably formed to a size and depth enough to penetrate the hot-melting resin, it is advantageous to be formed as large and deep as possible. However, when the size and depth of the groove 349 exceeds a certain threshold, the strength of the support member 348 may be weakened. Therefore, the groove 349 is preferably secured in size and depth within the limit that the minimum strength is secured. In addition, the groove 349 may be formed in any one of a planar shape, a circular shape, a quadrangular shape, a triangular shape, and a polygonal shape, but the shape of the groove 349 is not limited thereto. In addition, the groove 349 may be formed in any one of a semicircular shape, a quadrangular shape, a triangular shape, and a polygonal shape in a vertical cross section, and the shape of the groove 349 is not limited thereto. The groove 349 may be formed by a press method or a casting method, and the groove 349 is not limited thereto. Since the support member 348 has at least one groove 349 formed at a side surface thereof, the hot melt part (not shown) penetrates into the groove 349 to hold the hot melt part more firmly, thereby providing stronger shear strength. Can be secured.

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

Figure 5a shows a plan view of a cap plate according to another embodiment of the present invention, Figure 5b shows a cross-sectional view B-B of Figure 5a. 5B is similar to the embodiment of FIG. 3B except that an embossed anchor 452 and an auxiliary member 454 are additionally formed on the other side of the cap plate 440, and thus 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. 3B, detailed description thereof will be omitted.

The cap assembly includes a cap plate 440, an insulating plate, a terminal plate, and an electrode terminal. Since the insulating plate, the terminal plate, and the electrode terminal have been sufficiently described in the embodiment of FIG. 3B, detailed description thereof will be omitted.

Referring to FIGS. 5A and 5B, the cap plate 440 includes a terminal through hole 1 441, an electrolyte injection hole 442, a safety vent 443, an intaglio anchor 445, a support member 448, and an anode lead. A plate 450 and an embossed anchor 452 and the auxiliary member 454 are formed. The terminal through hole 1 441 is formed at approximately the center of the cap plate 440. In addition, the electrolyte injection hole 442, the negative anchor 445, the support member 448, and the positive lead plate 450 are formed at one side of the cap plate 440, and the safety vent 443 and the relief anchor ( The 452 and the auxiliary member 454 are formed at the other side of the cap plate 440. However, as mentioned above, the components formed on the cap plate 440 may be arranged differently.

The relief anchor 452 is formed to protrude to a predetermined height on the other side of the cap plate 440. Preferably, the relief anchor 452 is formed between the safety vent 443 and the other end of the cap plate 440. The embossed anchor 452 may be formed in a rectangular shape, a circular shape, or the like. In addition, the relief anchor 452 may have a width and a length similar to that of the intaglio anchor 445. In addition, the relief anchor 452 may be formed to a height corresponding to the depth of the intaglio anchor 445. However, the width, length and depth of the embossed anchor 452 is not limited thereto. The embossed anchor 452 is formed by a press method or a casting method, preferably formed by a press method. However, the method of forming the embossed anchor 452 is not limited thereto. The embossed anchor 452 is formed to protrude in the direction of the hot melt part (not shown) to serve to further strengthen the shear strength of the hot melt part together with the intaglio anchor 452 and the support member 448.

The auxiliary member 452 is formed between the relief anchor 452 and the hot melting portion. The auxiliary member 452 is formed to surround the upper surface and the side surface of the embossed anchor 452. In addition, the auxiliary member 452 is preferably formed of a plastic material, more preferably is formed of the same material as the plastic forming the hot-melting portion. The auxiliary member 452 is attached to the embossed anchor 452 using an adhesive means such as an adhesive. In addition, the auxiliary member 452 is preferably formed so that the planar shape corresponds to the planar shape of the embossed anchor 452, more preferably are formed in two squares of different sizes or two concentric circles of different diameters. . However, the planar shape of the auxiliary member 452 is not limited thereto. In addition, the auxiliary member 452 is formed to have a step on the side. That is, the auxiliary member 452 is a vertical cross-sectional shape is formed in a staircase shape. As the auxiliary member 452 is formed to have a step on the side, the contact area with the hot melt part is widened, so that the shear strength can be enhanced. In some cases, however, the step may not be formed. In addition, although not shown in the drawing, the auxiliary member 452 may have at least one groove formed on a side surface thereof. Since the groove penetrates into the hot melt part, the shear strength of the hot melt part may be further strengthened by the groove. When the auxiliary member 452 is not formed and the hot melting part and the embossed anchor 452 are formed in direct contact with each other, the bonding force between the hot melted part made of plastic and the embossed anchor 452 made of metal may be weakened. The auxiliary member 452 is formed of a plastic material so that the embossed anchor 452 can be more firmly coupled to the hot melting portion.

Next, a method of manufacturing a lithium secondary battery according to an embodiment of the present invention will be described. Hereinafter, for convenience, the manufacturing method of the embodiment of FIG. 3B will be described.

Method of manufacturing a lithium secondary battery 200 according to an embodiment of the present invention is the electrode assembly 220 forming step of forming an electrode assembly 220, the electrode assembly 220 to the upper opening 210a of the can 210. Inserting the electrode assembly 220 inserting step, the sealing step of sealing the upper opening 210a with the cap assembly 230, the electrolyte injection step, the intaglio anchor 245 forming step, the adhesive coating step, the support member 248 It comprises a forming step and hot-melting part forming step. In addition, the method for manufacturing a lithium secondary battery according to the embodiment of FIG. 5B further includes forming an embossed anchor 452 and forming an auxiliary member 454. Since the electrode assembly 220 forming step, the electrode assembly 220 insertion step, the sealing step, and the electrolyte injection step are similar to the general lithium secondary battery manufacturing method, detailed description thereof will be omitted.

The intaglio anchor 245 forming step is a step of forming the intaglio anchor 245 on one side of the upper surface of the cap plate 240. The engraved anchor 245 forming step may be made by a press method or a casting method, preferably made of a press method. Forming the intaglio anchor 245 is preferably made before manufacturing the cap assembly 230. That is, the intaglio anchor 245 forming step is performed in the process of manufacturing the cap plate 240.

The adhesive applying step is performed between the intaglio anchor 245 forming step and the supporting member 248 forming step. That is, the adhesive applying step is a process of applying the adhesive for stronger bonding to the portion where the intaglio anchor 245 and the support member 248 are coupled to each other after the intaglio anchor 245 is formed. At this time, the adhesive coating step may be omitted in some cases as described above.

The forming of the support member 248 is a step of fitting the support member 248 to the intaglio anchor 245.

The forming of the hot melting part is a step of forming a hot melting part including a protection circuit board on the cap plate 240. The hot melting part forming step is preferably made by injection molding method, but is not limited to the method of forming the hot melting part here. After the forming of the hot melting part, an inner pack battery including a protection circuit is completed.

On the other hand, the embossed anchor 452 forming step is preferably made in the manufacturing process of the cap plate 440, as in the intaglio anchor forming step, it is made by a press method or a casting method. In addition, the forming of the auxiliary member 454 is a step in which the auxiliary member 454 of plastic material is formed to surround the top and side surfaces of the embossed anchor 452. The auxiliary member 454 is attached to the embossed anchor 452 by the adhesive as described above.

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 according to the present invention and a method of manufacturing the same, by forming a negative anchor and a support member and / or an embossed anchor on the upper surface of the cap plate, it is possible to improve the shear strength by strengthening the bonding with the hot melt portion more It works

In addition, according to the lithium secondary battery according to the present invention and a method of manufacturing the same, as the shear strength is secured by the intaglio anchor and the support member, so as to simplify the shape of the lead plate to serve as an electrical connection, the manufacturing cost of the lead plate is reduced And the welding process of the lead plate can be made more easily.

Claims (20)

In a lithium secondary battery comprising an electrode assembly, a can containing the electrode assembly, and a cap assembly including a cap plate and sealing the top opening of the can, A hot melting part including a protective circuit board is formed on the cap plate, The cap plate has a negative anchor (anchor) is formed on one side, the lithium secondary battery, characterized in that the support member is fitted to the negative anchor. The method of claim 1, The cap plate is a lithium secondary battery, characterized in that the terminal through-hole is formed in the center is inserted, the electrolyte inlet is formed on one side and the safety vent is formed on the other side based on the terminal through-hole. The method of claim 2, The engraved anchor is a lithium secondary battery, characterized in that formed on one side of the cap plate. The method of claim 1, The engraved anchor is a lithium secondary battery, characterized in that the planar shape is formed in any one of a rectangular, circular, elliptical shape. The method of claim 1, The support member is a lithium secondary battery, characterized in that formed in any one of a rectangular pillar shape, a cylindrical shape, an elliptic cylinder shape to be in close contact with the intaglio anchor. The method of claim 5, The support member is a lithium secondary battery, characterized in that at least one groove is formed on the side. The method of claim 1, The support member is a lithium secondary battery, characterized in that the height from the upper surface of the cap plate is formed from 30% to 50% of the thickness of the hot melting portion. The method of claim 1, Lithium secondary battery, characterized in that the adhesive is interposed between the intaglio anchor and the support member. The method of claim 1, The second electrode lead plate is formed on the upper surface of the cap plate, the second electrode lead plate is a lithium secondary battery, characterized in that the cross-sectional shape in the direction perpendicular to the long side of the cap plate is formed in an L-shape. The method of claim 3, wherein The cap plate is a lithium secondary battery, characterized in that the embossed anchor is formed on the other side. The method of claim 10, Lithium secondary battery, characterized in that the auxiliary member is interposed between the embossed anchor and the hot melting portion. The method of claim 11, The auxiliary member is a lithium secondary battery, characterized in that formed of a plastic material. The method of claim 11, The auxiliary member is a lithium secondary battery, characterized in that attached to the embossed anchor with an adhesive. The method of claim 11, The auxiliary member is a lithium secondary battery, characterized in that at least one groove is formed on the side. The method of claim 11, The auxiliary member is a lithium secondary battery, characterized in that formed to have a step on the side. The method according to claim 2 or 9, The first electrode is a negative electrode, the second electrode is a lithium secondary battery, characterized in that the positive electrode. An intaglio anchor forming step of forming an intaglio anchor on one side of an upper surface of the cap plate; A supporting member forming step of fitting a supporting member to the intaglio anchor; And Method of manufacturing a lithium secondary battery comprising a hot-melting portion forming step of forming a hot-melting portion on the cap plate. The method of claim 17, Method of manufacturing a lithium secondary battery characterized in that it further comprises an adhesive coating step between the intaglio anchor forming step and the supporting member forming step. The method of claim 17, And a relief anchor forming step of forming a relief anchor on the other side of the upper surface of the cap plate. The method of claim 19, And a secondary auxiliary support forming step of covering the relief anchor with an auxiliary member made of plastic after the relief anchor forming step.

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