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US 9,520,738 B2Granted
Inductive charging device for a battery device
AssigneeRobert Bosch GmbH
InventorsMarcin Rejman, Guenter Lohr, Juergen Mack, Dragan Krupezevic
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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.
Claims4
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.
5 more elements
Dependencies are inferred from the claim text.