Method for manufacturing battery protection device and battery protection device

1. A method for manufacturing a battery protection device, comprising:

a step (a) of preparing an upper printed circuit board (PCB) plate having a metallic thin film formed on an upper surface thereof, a lower printed circuit board (PCB) plate having a metallic thin film formed on a lower surface thereof, and a metal plate for spacer which has at least one part laterally protruding from sides of the upper PCB plate and the lower PCB plate and which has at least one insulation hole formed through the metal plate for spacer;

a step (b) of joining the upper PCB plate and the lower PCB plate to each other with the metal plate for spacer interposed there between;

a step (c) of forming circuit patterns on the upper PCB plate and the lower PCB plate;

a step (d) of forming through-holes smaller than the insulation hole through the upper PCB plate and the lower PCB plate, and electrically connecting the upper PCB plate and the lower PCB plate through the through-holes;

a step (e) of forming an exposure hole in the upper PCB plate so as to expose the metal plate for spacer, and electrically connecting the metal plate for spacer and the upper PCB plate through the exposure hole; and

a step (f) of bending a protruding part of the metal plate for spacer in two stages to form a vertical extension part and a horizontal extension part.

2. The method for manufacturing a battery protection device according to claim 1 , wherein in the step (d), circuit connection points of the lower PCB plate and at least a “P+” terminal, a “P−” terminal and a “CF” terminal of the upper PCB plate are electrically connected.

3. The method for manufacturing a battery protection device according to claim 1 , wherein in the step (e), a “P+” terminal of the upper PCB plate and the metal plate for spacer are electrically connected.

4. The method for manufacturing a battery protection device according to claim 1 , wherein the step (b) is performed using an adhesive or adhesive sheet made of insulating material, and the inside of the insulation hole is filled with the adhesive or adhesive sheet after the step (b).

5. The method for manufacturing a battery protection device according to claim 3 , wherein the metal plate for spacer is made of aluminum, copper, phosphor bronze or beryllium copper having a nickel-plated surface or is made of aluminum, copper, phosphor bronze, beryllium copper or nickel.

6. The method for manufacturing a battery protection device according to claim 3 , wherein the metal plate for spacer is divided into a right part and a left part, and a space between the right part and the left part is filled with insulating material.

7. A battery protection device comprising:

an upper PCB plate which has a circuit pattern formed on an upper surface thereof;

a metal plate for spacer which is joined to a lower part of the upper PCB plate and which laterally protrudes from at least one side of the upper PCB plate to form a vertical extension part and a horizontal extension part; and

a lower PCB plate which has a circuit pattern formed on a lower surface thereof and which is joined to a lower part of the metal plate for spacer,

wherein an insulation hole is formed through the metal plate for spacer, the upper PCB plate and the lower PCB plate are electrically connected through through-holes which are formed through the upper PCB plate and the lower PCB plate and which are smaller than the insulation hole, and the upper PCB plate and the metal plate for spacer are electrically connected through an exposure hole.

8. The battery protection device according to claim 7 , wherein the lower PCB plate is connected to at least a “P+” terminal, a “P−” terminal and a “CF” terminal of the upper PCB plate through the through-holes.

9. The battery protection device according to claim 7 , wherein a “P+” terminal of the upper PCB plate is electrically connected to the metal plate for spacer through the exposure hole.

10. The method for manufacturing a battery protection device according to claim 2 , wherein the step (b) is performed using an adhesive or adhesive sheet made of insulating material, and the inside of the insulation hole is filled with the adhesive or adhesive sheet after the step (b).

11. The method for manufacturing a battery protection device according to claim 3 , wherein the step (b) is performed using an adhesive or adhesive sheet made of insulating material, and the inside of the insulation hole is filled with the adhesive or adhesive sheet after the step (b).

12. The battery protection device according to claim 8 , wherein the “P+” terminal of the upper PCB plate is electrically connected to the metal plate for spacer through the exposure hole.