KR20030066243A - Cap Assembly and Secondary Battery Therewith - Google Patents

Abstract

PURPOSE: Provided are a cap assembly, in which electrode tap contacts with inner side of case with rotating, so as to prevent a shortcircuit, even though electrode pin rotates during assembling or the use. CONSTITUTION: The cap assembly(40) comprises a cap plate(42) which is assembled at the top of case, seals the assembly(40), and has a plurality of fixed protrusions(44) at the bottom; an insulating plate(60) which is assembled at the bottom of the cap plate and has a fixed aperture(64) for inserting the fixed protrusions(44) and a polygonal assembling groove(66) at a part of the bottom; an insulating tube which is inserted into openings formed at the cap plate(42) and the insulating plate(60); an electrode pin(50) which is inserted into the insulating tube(54) and is electrically insulated from the cap plate(42); and a tab welding plate(68) which is electrically connected with the electrode pin(50) and electrode tab(32) of the electrode group, inserted into the assembling groove(66) of the insulating plate(60), and formed with a shape corresponding to the assembling groove(66).

Description

Cap assembly and secondary battery having same {Cap Assembly and Secondary Battery Therewith}

The present invention relates to a cap assembly and a secondary battery having the same, and more particularly, even when the electrode pin rotates, the rotation of the tab welding plate to which the electrode tab is welded to prevent the electrode tab from contacting the can is shorted. It relates to a cap assembly and a secondary battery having the same.

In general, secondary batteries are rechargeable and can be miniaturized and large-capacity, and may be classified into cylindrical batteries, rectangular batteries, and button batteries according to the appearance of a case accommodating an electrode group, which is an electrode assembly.

As shown in FIG. 3, the conventional secondary battery is in the form of a jelly roll in a state in which the separator 2 is separated from the case 2 and the positive electrode plate and the negative electrode plate housed in the case 2 and coated with the active material. The electrode assembly 4 formed by winding and the cap assembly 10 which seals the upper part of the said case 2 are comprised.

The cap assembly 10 may be integrally assembled to the case 2 to seal the cap plate 12 and the electrode pins electrically connected to the electrode tabs 5 installed on the electrode group 4. 14, the gasket 16 provided between the cap plate 12 and the electrode pin 14 to insulate, and the electrode tab 5 and the cap plate 12 provided in the electrode group 4 above. And an insulating plate 18 provided between the layers to insulate. A lower part of the insulating plate 18 is provided with a tab welding plate (not shown), which is electrically connected to the electrode pin 14 and to which the electrode tab 5 of the electrode group 4 is welded. .

The cap plate 12 and the insulating plate 18 are formed with holes 13 and 19 into which the gasket 16 is inserted, and the hole 16 into which the electrode pin 14 is inserted. (17) is formed.

In addition, the cap plate 12 is provided with an electrolyte inlet 11 for injecting and sealing the electrolyte solution, and a safety valve 15 that is opened when the pressure inside thereof rises to prevent explosion.

By the way, in the conventional secondary battery formed as described above, when the electrode pin 14 is rotated in the assembly process, the electrode tab 5 of the electrode group 4 connected to the electrode pin 14 is rotated, The bent outermost point of the electrode tab 5, which is installed in a bent state, is likely to be shorted in contact with the inner surface of the case 2.

An object of the present invention is to solve the above problems, to restrain the rotation of the electrode tab to prevent a short circuit by contacting the inner surface of the case while the electrode tab is rotated even when the electrode pin is rotated during the assembly process or use. To provide a cap assembly.

Another object of the present invention is to provide a secondary battery having a cap assembly which restricts the rotation of the electrode tab and prevents the electrode tab from rotating and contacting the inner surface of the case, even when the electrode pin rotates during the assembly process or use. It is to.

1 is an assembly cross-sectional view showing an embodiment of a secondary battery having a cap assembly according to the present invention,

Figure 2 is an exploded perspective view showing an embodiment of a cap assembly according to the present invention,

3 is an exploded perspective view illustrating a conventional secondary battery.

The cap assembly proposed by the present invention has a cap plate which is assembled and sealed at the top of the case and has a plurality of fixing protrusions protruding from the bottom thereof, and a fixing hole into which the fixing protrusion is assembled and inserted into the bottom of the cap plate. And the lower part of the insulating plate is formed with a polygonal assembling groove, the insulating tube is inserted into the insertion hole formed in the cap plate and the insulating plate, the electrode pin is inserted into the insulating tube and electrically isolated from the cap plate, and And a tab welding plate electrically connected to one electrode pin and an electrode tab of the electrode group and inserted into the assembly groove of the insulating plate and formed in a shape corresponding to the assembly groove.

The secondary battery having a cap assembly proposed by the present invention is formed in a state in which the positive electrode plate and the negative electrode plate coated with the active material are separated by a separator, and the electrode group having the electrode tab connected to the positive electrode plate and / or the negative electrode plate, and the electrode A case formed in a predetermined tubular shape accommodating the group, a cap plate assembled and sealed at the upper part of the case, and having a plurality of fixing protrusions protruding from the bottom, and assembled to the bottom of the cap plate and fixed as described above. A fixing hole into which protrusions are inserted is formed, and a bottom portion thereof includes an insulating plate having a polygonal assembly groove formed therein, an insulating tube inserted into the cap plate and an insertion hole formed in the insulating plate, and inserted into the insulating tube. An electrode pin which is blocked by the electrode, and electrically connected to the electrode pin of the electrode pin and the electrode group, and connected to the assembly groove of the insulating plate It comprises a mouth and tab weld plate is formed in a shape corresponding to the assembly groove.

Next, a preferred embodiment of a cap assembly and a secondary battery having the same according to the present invention will be described in detail with reference to the accompanying drawings.

First, an embodiment of a secondary battery having a cap assembly according to the present invention is formed in a state in which a positive electrode plate and a negative electrode plate coated with an active material are separated by a separator, as shown in FIG. 1, and the electrode tab is formed on the positive electrode plate and / or the negative electrode plate. The electrode group 30 to which the 32 is connected is installed, the case 20 formed in a predetermined cylindrical shape for accommodating the electrode group 30, and the upper part of the case 20, and assembled to seal the seal. It includes a cap assembly 40 to be performed.

1 and 2, the cap assembly 40 is assembled and sealed on the upper portion of the case 20 and the cap plate 42 is formed with a plurality of fixing projections 44 protruding from the bottom; And, the insulating plate 60 is assembled to the bottom of the cap plate 42 and the fixing hole 64 is inserted into the fixing projection 44 is formed, the bottom portion is formed with a polygonal assembly groove 66, The insulating tube 54 inserted into the insertion holes 43 and 63 formed in the cap plate 42 and the insulating plate 60, and inserted into the insulating tube 54 to be electrically connected to the cap plate 42. It is electrically connected to the electrode pin 50 is blocked by the electrode pin 50 and the electrode tab 32 of the electrode group 50 and the electrode group 30 is inserted into the assembly groove 66 of the insulating plate 60 and assembled And a tab welding plate 68 formed in a shape corresponding to the groove 66.

The cap plate 42, the electrode pin 50, and the tab welding plate 68 are formed of a conductive material, and the insulating plate 60 and the insulating tube 54 are formed of an insulating material.

The insulating tube 54 and / or the insulating plate 60 may be formed of insulating rubber, synthetic resin, or the like, or may be formed of glass metal.

The above-mentioned glass metal is gelled by mixing a glass with a melting point of 400 ° C. or less, or a glass in a granulated state and a metal, and becomes a non-conductive solid state at high temperature firing. Glass metals can form atomic bonds to other metal materials, allowing perfect sealing.

In the case where the insulating tube 54 is formed of glass metal, the insulating tube 54 is assembled between the cap plate 42 and the electrode pin 50 and then heated to a high temperature. 42 and the contact surface of the insulating tube 54 and the contact surface of the electrode pin 50 and the insulating tube 54 form an atomic bond with each other, so that the cap plate 42 and the insulating tube ( 54) and a complete sealing without a gap between the electrode pin 50 and the insulating tube 54 is made. Similarly, when the insulating plate 60 is formed of glass metal, an atomic bond is formed between the insulating plate 60 and the cap plate 42 to be integrated.

When the deformation groove 51 is formed on the bottom surface of the electrode pin 54, the insulating tube 54 is assembled in the cap plate 42 and the insulating plate 60. 54, the lower end of the electrode pin 54 when the electrode pin 54 is inserted, and then the bottom surface of the insulating tube 54 and the cap plate 42 and the insulating plate 60 is brought into close contact by spinning. The deformation of is made easier.

The tab welding plate 68 is in contact with and electrically connected to the bottom surface of the electrode pin 54.

The shape of the assembly groove 66 and the tab welding plate 68 formed in the insulating plate 60 is formed in a polygonal shape, such as a quadrangular, triangular, pentagonal or hexagonal shape, corresponding to each other. In the state where the tab welding plate 68 is inserted into 66, the rotation of the tab welding plate 68 is constrained.

In addition, at least two fixing protrusions 44 are formed on the bottom surface of the cap plate 42, and the fixing plate 64 is formed in the insulating plate 60 to which the fixing protrusions 44 are inserted. When the insulating plate 60 is assembled to the cap plate 42 so that one fixing protrusion 44 is inserted into the fixing hole 64, the insulating plate 60 is integrally combined with the cap plate 42 to form a cap plate. In the state in which 42 is fixed, rotation of the insulating plate 60 is restricted.

One embodiment of the cap assembly 40 and the secondary battery having the same according to the present invention made as described above is the electrode tab 32 is welded even if the electrode pin 50 is rotated during the assembly process or use. Since the tab welding plate 68 is constrained to rotate by the insulating plate 60, and the insulating plate 60 is constrained to rotate by the cap plate 42, the electrode tab 32 rotates to the case 20. No short circuit occurs in contact.

In the above, a cap assembly according to the present invention and a preferred embodiment of a secondary battery having the same have been described. However, the present invention is not limited thereto and is variously modified within the scope of the claims and the detailed description of the invention and the accompanying drawings. It is possible to do this and this also belongs to the scope of the present invention.

According to the cap assembly and the secondary battery having the same according to the present invention made as described above, even when the electrode pin is rotated, the rotation of the tab welding plate to which the electrode tab is welded is constrained by the insulating plate and the cap plate, the electrode tab is a case It is prevented from short-circuit in contact with, and the reliability and stability are greatly improved.

Claims (3)

A cap plate assembled and sealed at the top of the case and having a plurality of fixing protrusions protruding from the bottom thereof; An insulating plate assembled to a bottom surface of the cap plate and having a fixing hole into which the fixing protrusion is inserted, and an assembling groove of a polygon formed on a portion of the bottom surface; An insulating tube inserted into the insertion hole formed in the cap plate and the insulating plate; An electrode pin inserted into the insulating tube and electrically disconnected from the cap plate; And A tab welding plate electrically connected to the electrode pin and the electrode tab of the electrode group and inserted into the assembly groove of the insulating plate and formed in a shape corresponding to the assembly groove. Cap assembly comprising a. The method of claim 1, The insulating tube or the insulating plate cap assembly formed of glass metal. An electrode group in which the positive electrode plate and the negative electrode plate coated with the active material are formed in a state of being separated by a separator, and the electrode tabs are installed; A case formed in a predetermined cylindrical shape to accommodate the electrode group; A cap plate assembled and sealed at the top of the case and having a plurality of fixing protrusions protruding from a bottom thereof; An insulating plate assembled to a bottom surface of the cap plate and having a fixing hole into which the fixing protrusion is inserted, and an assembling groove of a polygon formed on a portion of the bottom surface; An insulating tube inserted into the insertion hole formed in the cap plate and the insulating plate; An electrode pin inserted into the insulating tube and electrically disconnected from the cap plate; And A tab welding plate electrically connected to the electrode pin and the electrode tab of the electrode group and inserted into the assembly groove of the insulating plate and formed in a shape corresponding to the assembly groove. Secondary battery having a cap assembly comprising a.