Component for secondary battery and manufacturing method thereof, and secondary battery and multi-battery apparatus manufactured by using the component

1. A component for a secondary battery, comprising:

a metal plate having at least one recess line, and made of a metal selected from the group consisting of copper, aluminum, and copper coated with nickel; and

a soldering pattern joined in the recess line, and having a lower melting point and electrical conductivity than the metal plate,

wherein a thickness of the metal plate in a region in which the soldering pattern is formed is smaller than a thickness of the metal plate in all regions in which the soldering pattern is not formed, and

wherein the recess line has a non-continuous line pattern.

2. The component for a secondary battery according to claim 1 , wherein the width of the inner bottom portion of the recess line is narrower than the width of the metal plate.

3. The component for a secondary battery according to claim 2 , wherein the bottom portion is non-continuously formed in the width-direction of the metal plate.

4. The component for a secondary battery according to claim 1 , wherein the recess line has any one pattern selected from a straight pattern, a zigzag pattern, a saw-toothed pattern, a wave pattern, and a combination thereof.

5. The component for a secondary battery according to claim 1 , wherein the recess line is formed on the top surface of the metal plate, the bottom surface thereof, or both.

6. The component for a secondary battery according to claim 1 , wherein the soldering pattern is made of a lead-free soldering material containing tin (Sn) and copper (Cu) and containing no lead (Pb).

7. The component for a secondary battery according to claim 6 , wherein the content of tin is in the range of 65 to 99.9 wt % and the content of copper is in the range of 0.01 to 35 wt %.

8. The component for a secondary battery according to claim 6 , wherein the soldering material farther contains at least one additional metal selected from nickel (Ni), zinc (Zn), and silver (Ag).

9. The component for a secondary battery according to claim 8 , wherein the content of the additional metal is in the range of 0.01 to 20 wt %.

10. The component for a secondary battery according to claim 1 , wherein the soldering pattern is made of a soldering material having a melting point of 100° C. to 250° C.

11. The component for a secondary battery according to claim 1 , wherein the soldering pattern has a cross-section selected from a square shape, a triangle shape, a trapezoid shape, a semiellipse shape, a semicircle shape, and a combination thereof.

12. The component for a secondary battery according to claim 1 , which further comprises an insulating tape for covering the soldering pattern.

13. A secondary battery comprising:

an electrode assembly in which a cathode lead and an anode lead are electrically coupled to each other; and

a packing for sealing the electrode assembly to externally expose a part of the cathode lead and the anode lead,

wherein the component for a secondary battery according to claim 1 is used as the cathode lead, the anode lead, or both.

14. A multi-battery apparatus comprising a plurality of secondary batteries electrically connected to each other, and a connector for connecting adjacent secondary batteries to each other,

wherein the component for a secondary battery according to claim 1 is used as the connector.

15. A multi-battery apparatus comprising two or more secondary battery modules having a plurality of secondary batteries therein, and external terminals connected to the modules by using connectors,

wherein the component for a secondary battery according to claim 1 is used as the connectors, external terminals, or both.

16. A multi-battery apparatus comprising two or more secondary battery packs having a plurality of secondary battery modules therein, and external terminals connected to the packs by using connectors, wherein the component for a secondary battery according to claim 1 is used as the connectors, external terminals, or both.

17. A method of manufacturing a component for a secondary battery, comprising:

(1) forming at least one recess line on the surface of a metal plate made of a metal selected from the group consisting of copper, aluminum, and copper coated with nickel; and

(2) forming, in the recess line, a soldering pattern having a lower melting point and electrical conductivity than the metal plate,

wherein a thickness of the metal plate in a region in which the soldering pattern is formed is smaller than a thickness of the metal plate in all regions in which the soldering pattern is not formed.

18. The method of manufacturing a component for a secondary battery according to claim 17 ,

wherein in step (1) the recess line is formed by using any one selected from an etching technology, a cutting technology, a scratching technology, an etching technology using an electron beam, and a skiving technology.

19. The method of manufacturing a component for a secondary battery according to claim 17 ,

wherein in step (1), the recess line is formed on the top surface of the metal plate, the bottom surface thereof, or both.

20. The method of manufacturing a component for a secondary battery according to claim 17 , further comprising:

covering the soldering pattern with an insulating tape on the top thereof.

21. The method of manufacturing a component for a secondary battery according to claim 17 , wherein step (2) includes:

disposing a soldering material in the recess line; and

applying a thermal energy and pressure to the soldering material.

22. The method of manufacturing a component for a secondary battery according to claim 21 ,

wherein the soldering material is a soldering wire having a cross-sectional structure corresponding to the shape of the recess line or a soldering paste having soldering powders dispersed therein.

23. The method of manufacturing a component for a secondary battery according to claim 21 ,

wherein the thermal energy is applied by using any one selected from a thermal conductivity method, an ultrasonic vibration method, an electron-beam radiation method, an electromagnetic inducing method, and a combination thereof.