BATTERY PACK

• US 20120052331A1
• Filed: 03/14/2011
• Published: 03/01/2012
• Est. Priority Date: 08/26/2010
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Park, Sanghun
• Granted Patent: US 9,451,710 B2
• Time in Patent Office: Days
• US Class Current: 429/7
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 50/502 Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
• CPC Class Codes: H01M 50/519 comprising printed circuit boards [PCB]
• CPC Class Codes: H01M 50/528 Fixed electrical connections, i.e. not intended for disconnection
• CPC Class Codes: H01M 50/533 characterised by the shape of the leads or tabs
• CPC Class Codes: H01M 50/536 characterised by the method of fixing the leads to the electrodes, e.g. by welding
• CPC Class Codes: H05K 2201/09427 Special relation between the location or dimension of a pad or land and the location or dimension of a terminal
• CPC Class Codes: H05K 2201/10037 Printed or non-printed battery
• CPC Class Codes: H05K 3/3426 characterised by the leads
• CPC Class Codes: H05K 3/363 by soldering
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Provided is a battery pack having improved product reliability by reducing a height of a solder portion connected when at least two or more unit cells are connected to a printed circuit module in series or parallel.

Aspects of the present invention provide a battery pack including a connection circuit board. The battery pack includes a multi-cell, a connection circuit board connected to the unit cells, a conductive lead drawn out from the connection circuit board, a printed circuit module having an opening into which the conductive lead is inserted, a solder portion formed by solder connection in which the conductive lead is inserted into the opening, wherein the conductive lead has an insertion portion inserted into the opening, a bent portion bent from the insertion portion, and a recess by which the insertion portion is divided.

Claims

1. A battery pack comprising:

a unit cell comprising;

a bare cell;

an electrode tab extending from the bare cell;

a circuit board electrically coupled to the electrode tab; and

a conductive lead electrically coupled to the circuit board and protruding from the bare cell, wherein the conductive lead comprises;

a base coupled to the circuit board; and

an insertion portion protruding from the base and having a recess or a through hole; and

a protective circuit module comprising an insulation board having an opening corresponding to each of the unit cells, wherein the insertion portion protrudes through the opening.

2. The battery pack of claim 1, wherein the conductive lead has a stepped portion between the insertion portion and the base.

3. The battery pack of claim 2, wherein a width of the conductive lead is greater at the stepped portion than at the insertion portion.

4. The battery pack of claim 2, wherein a printed circuit pattern extends around a periphery of the opening.

5. The battery pack of claim 4, wherein the stepped portion abuts the printed circuit pattern.

6. The battery pack of claim 4, wherein the printed circuit pattern extends along opposing surfaces of the insulation board.

7. The battery pack of claim 1, wherein the insertion portion includes a plurality of fingers separated by the recess.

8. The battery pack of claim 1, wherein a ratio of an area of the recess and an area of the insertion portion is between about 29% and about 74%.

9. The battery pack of claim 1, wherein a portion of the recess is within the opening.

10. The battery pack of claim 1, wherein the recess comprises a plurality of recesses.

11. The battery pack of claim 1, wherein the recess is substantially V-shaped.

12. The battery pack of claim 1, wherein a depth of the recess is greater than a thickness of the insulation board.

13. The battery pack of claim 1, wherein the insertion portion is substantially T-shaped.

14. The battery pack of claim 1, wherein a length of the through hole is greater than a thickness of the insulation board.

15. The battery pack of claim 1, wherein solder is in the through hole or in the recess to couple the insertion portion to the protective circuit module.

16. The battery pack of claim 1, wherein the conductive lead is coupled to the protective circuit module.

17. The battery pack of claim 1, wherein the insertion portion includes a plurality of fingers, wherein adjacent ones of the fingers are separated by the recess, and wherein solder is located within the recess.

18. The battery pack of claim 1, wherein the recess is on a side extending between the base and a distal end of the insertion portion.

19. The battery pack of claim 1, wherein the conductive lead further comprises a bent portion between the base and the insertion portion, the bent portion extending at an angle from the base.