Rechargeable hand tool battery

• US 10,229,784 B2
• Filed: 12/18/2013
• Issued: 03/12/2019
• Est. Priority Date: 12/21/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Lohr, Guenter, Krupezevic, Dragan, Mack, Juergen, Breitenbach, Jan, Rejman, Marcin
• Primary Examiner(s): Zhou, Zixuan
• Application Number:
  US14/653,711
• Publication Number:
  US 20150333559A1
• Time in Patent Office: 1,910 Days
• Field of Search: 307104, 320108, 320112-115
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• 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 50/247 specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
• 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 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• 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
• CPC Class Codes: H02J 7/0045 concerning the insertion or the connection of the batteries
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A rechargeable handheld tool battery includes: at least one rechargeable cell; and at least one inductive charging unit that has at least one inductive charging coil for charging the at least one rechargeable cell. A diameter of the inductive charging coil is greater than a principal extension length of the at least one rechargeable cell.

Claims

1. A rechargeable handheld tool battery, comprising:

at least one rechargeable cell; and

at least one inductive charging unit that has at least one inductive charging coil for charging the at least one rechargeable cell, wherein a diameter of the inductive charging coil is greater than a principal extension length of the at least one rechargeable cell,

wherein the at least one rechargeable cell has a principal extension direction that is oriented parallel to a coil plane of the at least one inductive charging unit,

wherein the inductive charging unit has a coil core unit having a plate region which shields the at least one rechargeable cell at least in part with respect to the inductive charging coil, wherein the plate region is a planar region of the coil core unit,

wherein the plate region has at least one axial length that is (i) shorter than the diameter of the inductive charging coil and (ii) shields the at least one rechargeable cell at least in part with respect to the inductive charging coil.

2. The rechargeable handheld tool battery as recited in claim 1, further comprising:

a battery housing having a coil receiving region for receiving the inductive charging coil, the coil receiving region forming at least in part a positive-fit element.

3. The rechargeable handheld tool battery as recited in claim 2, wherein the battery housing has a rechargeable cell receiving region for receiving the at least one rechargeable cell, the rechargeable cell receiving region being set back relative to the coil receiving region.

4. The rechargeable handheld tool battery as recited in claim 1, wherein the plate region is of at least substantially rectangular configuration.

5. The rechargeable handheld tool battery as recited in claim 1, wherein the coil core unit has multiple separate core pieces.

6. The rechargeable handheld tool battery as recited in claim 3, further comprising:

at least one heat distribution element provided to distribute a waste heat.

7. The rechargeable handheld tool battery as recited in claim 6, wherein the heat distribution element has at least one thermal conduction coating.

8. The rechargeable handheld tool battery as recited in claim 3, wherein at least the inductive charging unit is embodied as a preassembled module.

9. The rechargeable handheld tool battery as recited in claim 3, wherein an installation direction for installation of the rechargeable handheld tool battery on a handheld power tool extends at least substantially parallel to the coil plane of the inductive charging unit.

10. The rechargeable handheld tool battery as recited in claim 3, wherein the rechargeable handheld tool battery is part of a system which further includes a handheld power tool.

11. The rechargeable handheld tool battery as recited in claim 10, wherein with the handheld power tool and the rechargeable handheld tool battery in an assembled state, the at least one rechargeable cell is at least substantially surrounded by a handle housing.

12. The rechargeable handheld tool battery as recited in claim 3, wherein the rechargeable handheld tool battery is part of a system which further includes an inductive charging apparatus.

13. The rechargeable handheld tool battery as recited in claim 12, wherein the inductive charging apparatus has positive-fit elements for securing the rechargeable handheld tool battery during a charging phase.

14. The rechargeable handheld tool battery as recited in claim 13, wherein the inductive charging apparatus and the rechargeable handheld tool battery have a positioning protrusion and a positioning recess having basic shapes differing from one another.

15. A rechargeable handheld tool battery, comprising:

at least one rechargeable cell; and

at least one inductive charging unit that has at least one inductive charging coil for charging the at least one rechargeable cell, wherein a diameter of the inductive charging coil is greater than a principal extension length of the at least one rechargeable cell,

wherein the inductive charging unit has a coil core unit having a plate region which shields the at least one rechargeable cell at least in part with respect to the inductive charging coil, wherein the plate region is a planar region of the coil core unit,

wherein the plate region has at least one axial length that is (i) shorter than the diameter of the inductive charging coil and (ii) shields the at least one rechargeable cell at least in part with respect to the inductive charging coil.