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Patent Issued For Lithium-Battery Pack For A Hand Held Power Tool (USPTO 9379569)

Edit:ShenZhen Dingkangda Technoloy Co., Ltd      Date:Jul 13, 2016

By a News Reporter-Staff News Editor at Journal of Engineering -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Johnson, Todd W. (Wauwatosa, WI); Grzybowski, Dennis J. (New Berlin, WI); Kubale, Mark A. (West Bend, WI); Rosenbecker, Jay J. (Menomonee Falls, WI); Scheucher, Karl F. (Waite Hill, OH); Meyer, Gary D. (Waukesha, WI); Zeiler, Jeffrey M. (Pewaukee, WI); Glasgow, Kevin L. (Lomira, WI), filed on April 24, 2015, was published online on June 28, 2016.


The patent's assignee for patent number 9379569 is MILWAUKEE ELECTRIC TOOL battery CORPORATION (Brookfield, WI).


News editors obtained the following quote from the background information supplied by the inventors: "Typically, electrical equipment, such as, for example, a cordless power tool, is powered by a rechargeable battery. The battery may be periodically charged in a compatible battery charger."


As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "FIGS. 36-38 illustrate an existing battery pack 230. The existing battery pack 230 includes a housing 242 and at least one rechargeable battery cell 246 (shown in FIGS. 39-40) supported by the housing 242. In the illustrated construction, the existing battery pack 230 is an 18V battery pack including (see FIGS. 39-40) fifteen approximately 1.2V battery cells 246 connected in series. The battery cells 246 are a rechargeable battery cell chemistry type, such as, for example, NiCd or NiMH.


"As shown in FIGS. 39-40, in the existing battery pack 230, each battery cell 246 is generally cylindrical and extends along a cell axis 250 parallel to the cylindrical outer cell wall. In the existing battery pack 230, the cell axes 250 are parallel to one another. Also, in the existing battery pack 230, each battery cell 246 has a cell length 252 which is about two times the cell diameter 254. In the illustrated construction, each battery cell 246 has a length of about forty-six millimeters (46 mm) and a diameter of about twenty-three millimeters (23 mm).


"The existing battery pack 230 is connectable to (see FIG. 12) a battery charger 38, and the battery charger 38 is operable to charge the existing battery pack 230. The existing battery pack 230 is connectable to electrical equipment, such as, for example, a power tool 34 (shown in FIG. 11A), to power the power tool 34. As shown in FIGS. 36-38, the housing 242 provides a support portion 250 for supporting the existing battery pack 230 on an electrical device. In the illustrated construction, the support portion 250 provides (see FIG. 36) a C-shaped cross section which is connectable to a complementary T-shaped cross section support portion on the electrical device (the support portion on the power tool 34 (shown in FIG. 11B) and/or the battery support portion on the battery charger 38 (shown in FIG. 12)).


"The existing battery pack 230 includes (see FIGS. 36-37 and 39-40) a terminal assembly 286 operable to electrically connect battery cells 246 to a circuit in the electrical device. The terminal assembly 286 includes a positive battery terminal 298, a ground terminal 302, and a sense terminal 306. As illustrated in FIGS. 39-40, the terminals 298 and 302 are connected to the opposite ends of the cell or series of cells 246. The sense terminal 306 is connected to (see FIG. 40) an electrical component 314 which is connected in the circuit of the existing battery pack 230. In the illustrated construction, the electrical component 314 is a temperature-sensing device or thermistor to communicate the temperature of the existing battery pack 230 and/or of the battery cells 246.


"The present invention provides a battery pack which substantially alleviates one or more independent problems with the above-described and other existing battery packs. In some aspects and in some constructions, the present invention provides a battery pack including a two cells which are positioned in non-parallel relation to each other. In some aspects, the two cells are positioned in normal relation to each other.


"More particularly, in some aspects and in some constructions, the present invention provides a battery pack including a housing, a first cell extending along a first cell axis, and a second cell extending along a second cell axis, the first cell and the second cell being supported by the housing in an orientation in which the first cell axis is non-parallel to the second cell axis. In some aspects and in some constructions, the first cell axis is normal to the second cell axis.


"Also, in some aspects and in some constructions, the present invention provides a method of assembling a battery pack, the method including the acts of providing a battery pack housing, supporting a first cell with the housing, and supporting a second cell with the housing in non-parallel relation to the first cell. In some aspects, the act of supporting the second cell includes supporting the second cell in normal relation to the first cell.


"In addition, in some aspects and in some constructions, the present invention provides a battery pack including a plurality of cells, a sensor for sensing the voltage of a first group of the plurality of cells, a sensor for sensing the voltage of a second group of the plurality of cells, and a controller for comparing the voltage of the first group to the voltage of the second group to determine if one of the plurality of cells is at or below a voltage.


"Further, in some aspects and in some constructions, the present invention provides a method of determining a voltage of a cell of a battery pack, the battery pack including a plurality of cells, the method including the acts of sensing the voltage of a first group of the plurality of cells, sensing the voltage of a second group of the plurality of cells, and comparing the voltage of the first group to the voltage of the second group to determine if one of the plurality of cells is at or below a voltage.


"Also, in some aspects and in some constructions, the present invention provides a battery pack including a housing, a cell supported by the housing, a FET connected to the cell, and a heat sink in heat-transfer relationship with the FET.


"In addition, in some aspects and in some constructions, the present invention provides a method of assembling a battery pack, the method including the acts of providing a housing, supporting a cell with the housing, supporting a FET with the housing, connecting the FET to the cell, and supporting a heat sink in heat-transfer relationship with the FET.


"In one embodiment, the invention provides a rechargeable battery pack for powering a high current draw hand held power tool. The battery pack includes a housing and a plurality of battery cells. The housing is connectable to and supportable by the hand held power tool. The plurality of battery cells are supported by the housing. The battery cells are capable of producing an average battery pack discharge current greater than or equal to approximately 20 amps and have a lithium-based chemistry.


"Independent features and independent advantages of the invention will become apparent to those skilled in the art upon review of the detailed description and drawings."


For additional information on this patent, see: Johnson, Todd W.; Grzybowski, Dennis J.; Kubale, Mark A.; Rosenbecker, Jay J.; Scheucher, Karl F.; Meyer, Gary D.; Zeiler, Jeffrey M.; Glasgow, Kevin L.. Lithium-Battery Pack for a Hand Held Power Tool. U.S. Patent Number 9379569, filed April 24, 2015, and published online on June 28, 2016. Patent 


Keywords for this news article include: Chemicals, Chemistry, MILWAUKEE ELECTRIC TOOL CORPORATION.


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