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A battery pack for a cordless power has a plurality of battery cells disposed in a housing. In an embodiment of the invention, battery cells are interconnected with a laminated plate structure having non-conductive layers interspersed with conductive layers, at least one of the conductive layers con

A battery pack for a cordless power has a plurality of battery cells disposed in a housing. In an embodiment of the invention, battery cells are interconnected with a laminated plate structure having non-conductive layers interspersed with conductive layers, at least one of the conductive layers connected to the battery cells to interconnect them. In an embodiment of the invention, battery cells in a battery pack are interconnected with a flexible printed circuit board having conductive traces thereon that are attached to the battery cells to interconnect them. In an embodiment of the invention, a cordless power tool has one or the other of the foregoing battery packs. In an embodiment of the invention, the battery cells are Lithium Ion battery cells.

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1. A battery pack for a cordless power tool, comprising:a. a housing;b. a plurality of battery cells disposed in the housing; andc. a laminated plate disposed on at least one of a top and a bottom of the battery cells, the laminated plate including a conductive layer and a non-conductive layer, the

1. A battery pack for a cordless power tool, comprising:a. a housing;b. a plurality of battery cells disposed in the housing; andc. a laminated plate disposed on at least one of a top and a bottom of the battery cells, the laminated plate including a conductive layer and a non-conductive layer, the conductive layer including a plurality of terminal pads affixed to terminals of the battery cells and a plurality of conductive elements interconnecting the terminal pads to interconnect the battery cells.2. The battery pack of claim 1 wherein the conductive layer includes at least one power circuit layer and at least one signal layer, the power circuit layer including the plurality of conductive elements and the signal layer including the plurality of terminal pads.3. The battery pack of claim 2 wherein the non-conductive layer includes a plurality of non-conductive layers with the power circuit layer and the signal layer sandwiched between respective ones of the non-conductive layers with at least one of the non-conductive layers disposed between the power circuit layer and the signal layer.4. The battery pack of claim 2 wherein at least one of the power circuit layer and signal layer includes a printed circuit board.5. The battery pack of claim 4 wherein the printed circuit board is a flexible printed circuit board.6. The battery pack of claim 4 wherein the printed circuit board is etched on only one side so that the printed circuit board also provides the non-conductive layer.7. The battery pack of claim 3 wherein the power circuit layer and the signal layer include a printed circuit board.8. The battery pack of claim 7 wherein the printed circuit board of the power circuit layer and the printed circuit board of the signal layer are flexible printed circuit boards.9. The battery pack of claim 7 wherein the printed circuit board is etched on only one side so that the printed circuit board also provides the non-conductive layers.10. The battery pack of claim 1 wherein the conductive elements include conductive metal strips.11. The battery pack of claim 1 wherein the non-conductive layer includes a plurality of holes through which respective terminals of the battery cells extend.12. A battery pack for a cordless power tool, comprising:a. a housing;b. a plurality of battery cells disposed in the housing; andc. a first laminated plate disposed on a top of the battery cells and a second laminated plate disposed on a bottom of battery cells, each laminated plate including a conductive layer and a non-conductive layer, the conductive layer including a plurality of terminal pads affixed to terminals of the battery cells and a plurality of conductive elements interconnecting the terminal pads to interconnect the battery cells.13. The battery pack of claim 12 wherein the conductive layer includes at least one power circuit layer and at least one signal layer, the power circuit layer including the plurality of conductive elements and the signal layer including the plurality of terminal pads, the non-conductive layer including a plurality of non-conductive layers with the power circuit layer and the signal layer sandwiched between respective ones of the non-conductive layers with at least one non-conductive layer disposed between the power circuit layer and the signal layer.14. The battery pack of claim 12 wherein power circuit layer and signal layer each include a flexible printed circuit board.15. A battery pack for a cordless power tool, comprising:a. a housing;b. a plurality of battery cells disposed in the housing; andc. a laminated plate disposed on a top of the battery cells and a second laminated plate disposed on a bottom of battery cells, each laminated plate including first, second and third non-conductive layers, a power circuit layer sandwiched between the first and second non-conductive layers and a signal layer sandwiched between the second and third non-conductive layers, the signal layer including a including a plurality of terminal pads affixed to terminals of the battery cells and the power circuit layer including a plurality of conductive elements interconnecting the terminal pads to interconnect the battery cells.16. The battery pack of claim 15 wherein at least one of the power circuit layer and signal layer include a printed circuit board.17. The battery pack of claim 16 wherein the printed circuit board is a flexible printed circuit board.18. The battery pack of claim 15 wherein the conductive elements include conductive metal strips.19. The battery pack of claim 2 wherein the signal layer has terminal pads for only those battery cells requiring a signal connection.20. The battery pack of claim 13 wherein the signal layer has terminal pads for only those battery cells requiring a signal connection.21. The battery pack of claim 15 wherein the signal layer has terminal pads for only those battery cells requiring a signal connection.22. The battery pack of claim 1 wherein the battery cells are Lithium Ion battery cells.23. The battery pack of claim 13 wherein the battery cells are Lithium Ion battery cells.24. The battery pack of claim 15 wherein the battery cells are Lithium Ion battery cells.25. The battery pack of claim 1 wherein the conductive elements include a plurality of conductive metal strips, the non-conductive layer includes a plurality of holes disposed about connecting segments that join the plurality of conductive metal strips prior to the connecting segments being broken during formation of the battery pack to provide access to the connecting segments.26. A cordless power tool, comprising:a. a housing having a motor disposed therein; andb. a battery pack coupled to the housing, the battery pack including a battery pack housing with a plurality of battery cells disposed therein with a laminated plate disposed on at least one of a top and bottom of the battery cells, the laminated plate including a conductive layer and a non-conductive layer, the conductive layer including a plurality of terminal pads affixed to terminals of the battery cells and a plurality of conductive elements interconnecting the terminal pads to interconnect the battery cells.27. The cordless power tool of claim 26 wherein the laminated plate includes first and second laminated plates with the first laminated plate disposed on the top of the battery cells and the second laminated plate disposed on the bottom of the battery cells.28. The cordless power tool of claim 26 wherein the conductive layer includes at least one power circuit layer and at least one signal layer, the power circuit layer including the plurality of conductive elements and the signal layer including the plurality of terminals pads, the non-conductive layer including a plurality of non-conductive layers with the power circuit layer and the signal layer sandwiched between respective ones of the non-conductive layers with at least one non-conductive layer disposed between the power circuit layer and the signal layer.29. The cordless power tool of claim 28 wherein at least one of the power circuit layer and the signal layer includes a printed circuit board.30. The cordless power tool of claim 29 wherein the printed circuit board is a flexible printed circuit board.31. The cordless power tool of claim 28 wherein the battery cells include Lithium Ion battery cells.