Inductive charging device for a battery device

• US 9,520,738 B2
• Filed: 12/19/2013
• Issued: 12/13/2016
• Est. Priority Date: 12/21/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Rejman, Marcin, Lohr, Guenter, Mack, Juergen, Krupezevic, Dragan
• Primary Examiner(s): Rodas, Richard Isla
• Assistant Examiner(s): Bui, Dung V
• Application Number:
  US14/134,582
• Publication Number:
  US 20140176064A1
• Time in Patent Office: 1,090 Days
• Field of Search: 320/108
• US Class Current: 1/1
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence

Abstract

A charging system for a battery device of a handheld tool includes a charging device provided to inductively charge the battery device in a charging operation, the charging device having at least one induction charging unit which has at least one charging coil having a main coil extension. A gap is provided between the battery device and the charging device in a charging operation. A ratio between (i) the at least one main coil extension and (ii) a minimum clearance between the at least one charging coil and a surface defining the gap is at most 30/1.

Claims

1. A system, comprising:

a battery device including a first induction charging unit that includes at least one first charging coil having a main coil extension; and

a charging device configured to transmit a charging energy inductively to the battery device, the charging device including a second induction charging unit that includes at least one second charging coil having a main coil extension;

wherein;

between the battery device and charging device is a gap delimited by a surface of the battery device and a surface of the charging device;

a ratio of (i) the main coil extension of the at least one first charging coil to (ii) a clearance between the at least one first charging coil and the surface of the battery device is at most 30/1;

a ratio of (i) the main coil extension of the at least one second charging coil to (ii) a clearance between the at least one second charging coil and the surface of the charging device is at most 30/1;

wherein at least one of the ratios is at least 7/1.

2. The system as recited in claim 1, wherein at least one of the ratios is between 20/1 and 14/1.

3. The system as recited in claim 1, wherein the at least one second charging coil has a main coil extension of at least 50 mm.

4. The system as recited in claim 1, wherein the battery device is of a handheld tool.