Charging device with an interchangeable battery for a power tool

• US 8,283,889 B2
• Filed: 07/12/2007
• Issued: 10/09/2012
• Est. Priority Date: 09/11/2006
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Osswald, Alexander, Schmid, Ursula, Dengler, Klaus
• Primary Examiner(s): Muralidar, Richard V
• Application Number:
  US12/163,000
• Publication Number:
  US 20090027005A1
• Time in Patent Office: 1,916 Days
• Field of Search: 320/113, 320/115, 320/107, 320/128, 320/134, 320/136
• US Class Current: 320/115
• CPC Class Codes: B25F 5/00 Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A charging device (10, 100) includes a charging unit (12) and at least one interchangeable, rechargeable energy storage unit (14), in particular an interchangeable battery (18), of a power tool (16). Each energy storage unit (14) has first contact means (24) for contacting the corresponding power tool (16) and additional contact elements (38) for contacting the charging unit (12) in such a way that the charging unit (12) is able to charge the energy storage unit (14) via the additional contact elements (38), both when the unit is connected to the power tool (16) and when it is disconnected from the power tool (16).

Claims

1. A charging device (10, 100) of a power tool (16), comprising:

a charging unit (12); and

at least one interchangeable, rechargeable energy storage unit (14), in the form of an interchangeable battery (18), in which each energy storage unit (14) has first contact means (24) for contacting the corresponding power tool (16),

wherein each energy storage unit (14) has additional contact means (38) for contacting the charging unit (12) in such a way that the charging unit (12) charges the energy storage unit (14) via the additional contact means (38), both when the energy storage unit (14) is connected to the power tool (16) and when the energy storage unit (14) is disconnected from the power tool (16),

wherein each energy storage unit (14) has a sensor (44) emitting a sensor signal (S, S₁, S₂, S₃) relating to the energy storage unit (14) and evaluated by both the power tool (16) and the charging unit (12), with each of said emitting of the sensor signal and evaluation of the sensor signal performed with a measurement procedure,

wherein the first contact means (24) of the respective energy storage unit (14) convey the sensor signal (S, S₁, S₂, S₃) to the power tool (16) and the additional contact means (38) convey the sensor signal (S, S₁, S₂, S₃) to the charging unit (12), and

wherein the power tool (16) has an evaluation and detection means (48), which detects from the sensor signal (S, S₁, S₂, S₃) whether the charging unit (12) is currently charging the energy storage unit (14) connected to the power tool (16).

2. The charging device (10, 100) as recited in claim 1, wherein if a charging procedure is detected, then the evaluation and detection means (48) of the power tool (16) does not carry out an evaluation of the sensor signal (S, S₁, S₂, S₃).

3. The charging device (10, 100) as recited in claim 1, wherein the evaluation and detection means (48) of the power tool (16) evaluates the sensor signal (S, S₁, S₂, S₃) if the energy storage unit (14) connected to the power tool (16) is not currently undergoing a charging procedure.

4. The charging charging device (10, 100)as recited in claim 1, wherein with each measurement procedure, the evaluation and detection means (48) of the power tool (16) tests whether the charging unit (12) is currently charging the energy storage unit (14) connected to the power tool (16).

5. The charging device (10, 100) as recited in claim 1, wherein the charging unit (12) interrupts the evaluation of the sensor signal (S, S₁, S₂, S₃) for a definite time interval (T, T₁, T₂, T₃).

6. The charging device (10, 100) as recited in claim 5, wherein the evaluation and detection means (48) of the respective power tool (16) detects the interruption of the evaluation of the sensor signal (S, S₁, S₂, S₃) by the charging unit (12) and evaluates the sensor signal (S, S₁, S₂, S₃) during the definite time interval (T, T₁, T₂, T₃).

7. The charging device (10, 100) as recited in claim 5, wherein the charging unit (12) continues the evaluation of the sensor signal (S, S₁, S₂, S₃) once more after the definite time interval (T, T₁, T₂, T₃).

8. The charging device (10, 100) as recited in claim 1, wherein the charging unit (12) assigns each energy storage unit (14) of the power tool (16) that is connected to the charging unit (12) its own definite time interval (T₁, T₂, T₃) during which the evaluation and detection means (48) of the power tool (16) evaluates the sensor signal (S₁, S₂, S₃) of the energy storage unit (14) connected to it.