SYSTEM

• US 20140176064A1
• Filed: 12/19/2013
• Published: 06/26/2014
• 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
• Granted Patent: US 9,520,738 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• 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 charging system for a battery device of a handheld tool, comprising:

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

a gap situated between the battery device and the charging device, wherein a ratio between (i) the main coil extension and (ii) a minimum clearance between the at least one charging coil and a first surface defining the gap is at most 30/1.

2. The system as recited in claim 1, wherein the battery device includes a second induction charging unit which has a second charging coil having a main coil extension, wherein a ratio between (i) the main coil extension of the second charging coil and (ii) a minimum clearance between the second charging coil and a second surface defining the gap is at most 30/1.

3. The system as recited in claim 2, wherein at least one of:

(i) a ratio between the main coil extension of the at least one charging coil and the minimum clearance between the at least one charging coil and the first surface defining the gap is at least 7/1; and

(ii) a ratio between the main coil extension of the second charging coil and the minimum clearance between the second charging coil and the second surface defining the gap is at least 7/1.

4. The system as recited in claim 3, wherein at least one of:

(i) a ratio between the main coil extension of the at least one charging coil and the minimum clearance between the at least one charging coil and the first surface defining the gap is between 20/1 and 14/1; and

(ii) a ratio between the main coil extension of the second charging coil and the minimum clearance between the second charging coil and the second surface defining the gap is between 20/1 and 14/1.

5. The system as recited in claim 2, wherein the at least one charging coil has a main coil extension of at least 50 mm.

6. A battery system, comprising:

a battery device; and

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

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

wherein the battery device includes a second induction charging unit which has a second charging coil having a main coil extension, wherein a ratio between (i) the main coil extension of the second charging coil and (ii) a minimum clearance between the second charging coil and a second surface defining the gap is at most 30/1.