Battery pack including an electric harness and method of manufacturing the same

• US 8,764,852 B2
• Filed: 04/27/2012
• Issued: 07/01/2014
• Est. Priority Date: 09/04/2007
• Status: Active Grant

• Current Assignee: Milwaukee Electric Tool Corporation (Techtronic Industries Company Limited)
• Original Assignee: Milwaukee Electric Tool Corporation (Techtronic Industries Company Limited)
• Inventors: Scott, John S., Thorson, Troy C., Hessenberger, Jeffrey C.
• Primary Examiner(s): Ruddock, Ula C
• Assistant Examiner(s): CHERNOW, FRANK A
• Application Number:
  US13/458,214
• Publication Number:
  US 20120210567A1
• Time in Patent Office: 795 Days
• Field of Search: 296/231
• US Class Current: 29/623.1
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H01M 50/213 adapted for cells having curved cross-section, e.g. round or elliptic H01M50/209, H01M50/216 take precedence
• CPC Class Codes: H01M 50/50 Current conducting connections for cells or batteries
• CPC Class Codes: H01M 50/503 characterised by the shape of the interconnectors
• CPC Class Codes: H01M 50/51 Connection only in series
• CPC Class Codes: H01M 50/516 by welding, soldering or brazing
• CPC Class Codes: H01M 50/519 comprising printed circuit boards [PCB]
• CPC Class Codes: H01M 50/522 Inorganic material
• CPC Class Codes: H01M 6/44 of tubular or cup-shaped cells
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/49108 Electric battery cell making
• CPC Class Codes: Y10T 29/53135 Storage cell or battery

Abstract

A battery pack including an electric coupling assembly. The battery pack includes a top housing, a bottom housing, a cell pad, a plurality of battery cells, a harness, and a circuit board. The harness includes a frame and electric coupler assembly having a plurality of internal and external electric couplings. The internal and external electric couplings include cell couplings and circuit board couplings. The internal and external couplings are held in place during manufacturing by links which are cut after the electric coupler assembly is molded into the frame.

Claims

1. A method of manufacturing a battery pack including a top housing, a bottom housing, a frame, a cell pad, a plurality of battery cells, a circuit board, and an electric coupler assembly being formed from a single sheet of metal and having a plurality of links, a plurality of cell couplings, and a plurality of circuit board couplings, the plurality of cell couplings electrically connecting the plurality of battery cells, the plurality of links electrically connecting the plurality of cell couplings, the method comprising:

molding the frame around the electric coupler assembly into the frame;

after molding, severing the plurality of links between the plurality of cell couplings to provide desired electrical connections between the plurality of battery cells;

attaching the battery cells to the plurality of cell couplings after the links have been severed; and

attaching the circuit board to the plurality of circuit board couplings;

wherein the circuit board is electrically connected to each battery cell individually.

2. The method of claim 1, further comprising supporting the battery cells by the cell pad.

3. The method of claim 1, further comprising enclosing the frame, the electric coupler assembly, the cell pad, the plurality of battery cells, and the circuit board in the top and bottom housing.

4. The method of claim 1, further comprising stamping the electric coupler assembly from a single piece of flat material.

5. The method of claim 4, further comprising bending the plurality of circuit board couplings in a first direction substantially 90 degrees from a plane formed by the flat material.

6. The method of claim 5, further comprising bending the plurality of cell couplings in a second direction substantially 90 degrees from the plane of the flat material, the second direct opposite the first direction.

7. The method of claim 1, wherein the attaching of the battery cells to the cell couplings includes one of welding and soldering.

8. The method of claim 1, further comprising supporting the battery cells by the frame, the electric coupler assembly, the cell pad, and the lower housing to prevent movement of the battery cells.

9. The method of claim 1, further comprising supporting the circuit board on the frame.

10. The method of claim 1, wherein severing the plurality of links severs the electrical connection between the plurality of cell couplings, each of the cell couplings providing an individual electrical connection to at least one of the plurality of battery cells.

11. The method of claim 1, wherein the electric coupler assembly includes a plurality of electric couplings, each of the plurality of electric couplings having at least one cell coupling and a circuit board coupling, each link being connected between adjacent electric couplings, and wherein severing the plurality of links severs an electrical connection between adjacent electric couplings.

12. The method of claim 1, wherein molding the electric coupler assembly into the frame includes molding the frame around the electric coupler assembly.

13. A method of manufacturing a battery pack, the method comprising:

providing an electric coupler assembly being formed from a single sheet of metal and including a plurality of electric couplings and a plurality of links connected between adjacent ones of the plurality of electric couplings, each of the plurality of electric couplings being formed to include at least one cell coupling;

fixing the electric coupler assembly to a frame;

after fixing, severing the plurality of links between the adjacent ones of the electric couplings; and

after severing, attaching a battery cell to each of the plurality of cell couplings with desired electrical connections between the plurality of battery cells provided by severing the plurality of links.

14. The method of claim 13, wherein fixing the electric coupler assembly to the frame includes adhering the electric coupler assembly to the frame.

15. The method of claim 13, wherein fixing the electric coupler assembly to the frame includes molding the electric coupler assembly into the frame.

16. The method of claim 15, wherein molding the electric coupler assembly into the frame includes molding the frame around the electric coupler assembly.

17. The method of claim 13, wherein forming an electric coupler assembly includes forming each of the plurality of electric couplings to include a circuit board coupling, and wherein the method further comprises attaching a circuit board to the plurality of circuit board couplings, the circuit board being electrically connected to each battery cell individually.

18. The method of claim 13, further comprising supporting the frame, the electric coupler assembly and the plurality of battery cells in a battery pack housing.

20. The method of claim 13, wherein forming an electric coupler assembly includes forming each of the plurality of electric couplings to include a circuit board coupling, and wherein the method further comprises attaching a circuit board to the plurality of circuit board couplings, the circuit board being electrically connected to each battery cell individually.

19. A method of manufacturing a battery pack, the method comprising:

providing an electric coupler assembly being formed from a single sheet of metal and including a plurality of electric couplings and a plurality of links connected between adjacent ones of the plurality of electric couplings, each of the plurality of electric couplings being formed to include at least one cell coupling;

molding a frame around the electric coupler assembly;

after molding, severing the plurality of links between the adjacent ones of the electric couplings;

after severing, attaching battery cells to the plurality of cell couplings;

and supporting the frame, the electric coupler assembly and the plurality of battery cells in a battery pack housing.