Rechargeable battery pack and electrical hand tool device

• US 8,663,834 B2
• Filed: 09/20/2005
• Issued: 03/04/2014
• Est. Priority Date: 09/20/2005
• Status: Active Grant

• Current Assignee: Metabowerke GMBH (Koki Holdings Co., Ltd.)
• Original Assignee: Metabowerke GMBH (Koki Holdings Co., Ltd.)
• Inventors: Liersch, Ralph, Stickel, Wolfgang, Graeber, Jochen
• Primary Examiner(s): APICELLA, KARIE O
• Application Number:
  US12/067,367
• Publication Number:
  US 20080254356A1
• Time in Patent Office: 3,087 Days
• Field of Search: 429/160, 429/97
• US Class Current: 429/160
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• 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 50/503 characterised by the shape of the interconnectors
• CPC Class Codes: H01M 50/509 characterised by the type of connection, e.g. mixed connections
• 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 50/522 Inorganic material
• CPC Class Codes: H01M 50/528 Fixed electrical connections, i.e. not intended for disconnection
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The invention relates to a rechargeable battery pack, in particular for an electrical hand tool device, comprising at least two series-connected rechargeable battery cells (20) and/or rechargeable batter cell blocks and an electronics unit having a printed circuit board (14), wherein sheet metal conductors (16) for electrically connecting the series-connected rechargeable battery cells (20) and/or rechargeable battery cell blocks are provided, wherein the sheet metal conductors (16) are connected directly to the printed circuit board (14).

Claims

1. A battery pack for a hand-held power tool, comprising:

a multiplicity of elongated battery cells having opposite anode and cathode ends, and which are further oriented in a parallel relationship to the other battery cells;

a pair of battery cell carriers each having an uppermost, and a lowermost peripheral edge, and further having formed therein a multiplicity of openings which are formed in a given pattern, and which are further dimensioned to individually receive the opposite anode and cathode ends of the respective elongated battery cells, and orient the respective multiplicity of elongated battery cells in a substantially parallel relationship, one relative to the others, and wherein each battery cell carrier further has a latching device mounted on the uppermost peripheral edge, and which further extends substantially normally upwardly therefrom;

a sheet metal conductor having a proximal end which extends through at least one of the openings which is defined by the respective battery cell carriers, and is further disposed in direct electrical contact with the anode and cathode ends of at least two of the elongated battery cells so as to serially electrically couple together the elongated battery cells, and wherein the sheet metal conductor, has an opposite distal end;

a single printed circuit board having a top and bottom surface, and a pair of laterally disposed peripheral edges, and wherein the single printed circuit board is dimensioned so as to extend between the uppermost peripheral edges of the respective battery cell carriers, and wherein a recess is formed in each of the laterally disposed peripheral edge of the single printed board and which is dimensioned to receive, therethrough, the latching device, and secure the bottom surface of the single printed circuit board in at least partial covering relation relative to the multiplicity of elongated battery cells, and in a location which is positioned between the opposite anode and cathode ends thereof, and wherein the distal end of the sheet metal conductor is electrically coupled to the single printed circuit board;

an electrical cable having a first end and a second end; and

a connection pin having a pair of electrical terminals which are electrically coupled to the second end of the electrical cable, and wherein the connection pin releasably, matingly cooperates with a hand held power tool to supply a source of electrical energy to the hand held power tool which is supplied from the respective multiplicity of battery cells.