Protection circuit board for secondary battery and secondary battery using the protection circuit board

• US 8,440,346 B2
• Filed: 02/29/2008
• Issued: 05/14/2013
• Est. Priority Date: 03/15/2007
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Kim, Woochoul
• Primary Examiner(s): Ridley, Basia
• Assistant Examiner(s): Leong, Jonathan G
• Application Number:
  US12/074,065
• Publication Number:
  US 20080226980A1
• Time in Patent Office: 1,901 Days
• Field of Search: 429/7, 429122-347, 320 73- 79, 320/136, 320/134
• US Class Current: 429/163
• CPC Class Codes: H01G 9/0003 Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films H01G9/12 takes precedence
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H01M 2200/106 PTC
• CPC Class Codes: H01M 50/147 Lids or covers
• CPC Class Codes: H05K 1/0259 Electrostatic discharge [ESD] protection
• CPC Class Codes: H05K 1/181 associated with surface mounted components
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A protection circuit board for a secondary battery includes an insulation substrate, a protection circuit part including an electrode tap connection terminal and a charge/discharge terminal, arranged on the insulation substrate, and a printed circuit board including a passive element and a positive element, connected to a printed circuit board pattern. A static electricity absorbing part is arranged at a periphery of the printed circuit board pattern.

Claims

1. A protection circuit board for a secondary battery, comprising:

an insulation substrate providing opposed major surfaces exhibiting a bow extending outwardly along a minor section of an edge of the major surfaces;

a printed circuit board having a charge/discharge terminal and a test terminal, said printed circuit board pattern arranged on the major surfaces of the insulation substrate;

a static electricity absorbing part arranged at the printed circuit board pattern; and

a resin molding part, composed of resin, covering an entirety of the printed circuit board pattern with the exception of the charge/discharge terminal and the test terminal and overlapping the protection circuit board forming a side wall to which a can is attached, said resin molding part having a hole in said side wall passing through to the static electricity absorbing part, the static electricity absorbing part and the hole being separate from the charge/discharge terminal and the test terminal, and a conductor attached to the static electricity absorbing part by soldering.

2. A protection circuit board as claimed in claim 1, wherein the static electricity absorbing part is arranged at a periphery of the printed circuit board pattern.

3. The protection circuit board as claimed in claim 1, wherein the static electricity absorbing part is coupled to a ground pattern of the printed circuit board pattern.

4. The protection circuit board as claimed in claim 2, wherein an area of the ground pattern coupled to the static electricity absorbing part is enlarged.

5. The protection circuit board as claimed in claim 2, wherein a width of the insulation substrate corresponding to the static electricity absorbing part is enlarged to conform to the bow of the insulation substrate.

6. The protection circuit board as claimed in claim 1, further comprising an electrode connection part disposed on an end portion of the insulation substrate.

7. The protection circuit board as claimed in claims 5, wherein the test terminal and charge/discharge terminal are arranged on the insulation substrate, wherein the test terminal and charge/discharge terminal are disposed on an enlarged area of the insulation substrate corresponding to the enlarged width.

8. The protection circuit board as claimed in claim 1, wherein the conductor comprises one material selected from Cu, Al, Ni and stainless steel.

9. A secondary battery, comprising:

an electrode assembly;

a can receiving the electrode assembly;

a cap assembly including an electrode terminal and a cap plate electrically coupled to the electrode assembly;

a protection circuit board having a charge/discharge terminal and a test terminal, said protection circuit board including an insulation substrate which has opposed major surfaces exhibiting a bow extending outwardly along a minor section of an edge of the major surfaces, a printed circuit board pattern arranged on the insulation substrate and a static electricity absorbing part arranged at the printed circuit board pattern; and

a lead electrode part electrically connecting the electrode assembly to the protection circuit board; and

a resin molding part, composed of resin, covering an entirety of the printed circuit board pattern with the exception of the charge/discharge terminal and the test terminal and overlapping the protection circuit board forming a side wall to which the can is attached, said resin molding part having a hole in said side wall passing through to the static electricity absorbing part, the static electricity absorbing part and the hole being separate from the charge/discharge terminal, and a conductor attached to the static electricity absorbing part by soldering.

10. The secondary battery as claimed in claim 9, wherein:

the can comprises a short side and a long side; and

the protection circuit hoard is disposed on the long side of the can.

11. The secondary battery as claimed in claim 10, further comprising an insulator disposed between the lead electrode part and the can.

12. The secondary battery as claimed in claim 9, wherein the static electricity absorbing part is arranged at a periphery of the printed circuit board pattern.

13. The secondary battery as claimed in claim 9, wherein the static electricity absorbing part is coupled to a ground pattern of the printed circuit board pattern.

14. The secondary battery as claimed in claim 13, wherein an area of the ground pattern coupled to the static electricity absorbing part is enlarged.

15. The secondary battery as claimed in claim 13, wherein a width of the insulation substrate corresponding to the static electricity absorbing part is enlarged to conform to the bow of the insulation substrate.

16. The secondary battery as claimed in claim 15, wherein the test terminal and the charge/discharge terminal are arranged on the insulation substrate, wherein the test terminal and the charge/discharge terminal are disposed on an enlarged area of the insulation substrate corresponding to the enlarged width.