METHOD AND DEVICE FOR TOTAL DISCHARGE PROTECTION OF A STORAGE BATTERY OF A HAND-HELD POWER TOOL

• US 20150280468A1
• Filed: 10/07/2013
• Published: 10/01/2015
• Est. Priority Date: 10/08/2012
• Status: Abandoned Application

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Brandner, Michael, Mller, Thomas
• Application Number:
  US14/434,269
• Publication Number:
  US 20150280468A1
• Time in Patent Office: Days
• US Class Current: 1/1
• 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: H02H 3/243 for DC systems
• CPC Class Codes: H02H 7/18 for batteries; for accumulators
• CPC Class Codes: H02J 7/00306 Overdischarge protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/007182 in response to battery voltage

Abstract

The present invention relates to a method for total discharge protection of a storage battery of a hand-held power tool, comprising the following steps: determining a current average ON-time of the hand-held power tool; and setting a reference duration for total discharge protection of the storage battery as a function of the determine average ON-time of the hand-held power tool.

Claims

1. A method for deep discharge protection of a supply battery of a hand-held power tool, the method comprising determining an actual average ON-time of the hand-held power tool;

and setting a reference duration value for deep discharge protection of the supply battery as a function of the determined average ON-time of the hand-held power tool.

2. The method according to claim 1, comprising switching-off the hand-held power tool if a time period falling short of a specific limiting voltage of the supply battery is greater than the set reference duration value.

3. The method according to claim 1, comprising setting the reference duration value at a value less than the determined average ON-time of the hand-held power tool.

4. The method according to claim 1, comprising setting the reference duration value at a value between 50% and 90% of the determined average ON-time of the hand-held power tool.

5. The method according to claim 1, comprising setting in that the reference duration value at a value less than a maximum permitted reference duration value and greater than a minimal permitted reference duration value.

6. The method according to claim 1, comprising determining the average ON-time of the hand-held power tool by averaging over at least two ON-times of the hand-held power tool.

7. The method according claim 1, comprising storing the determined average ON-time of the hand-held power tool as a finally determined average ON-time.

8. The method according to claim 7, comprising determining the average ON-time of the hand-held power tool by averaging over at least two ON-times of the hand-held power tool and the finally determined average ON-time.

9. The method according to claim 1, comprising determining the average ON-time of the hand-held power tool over a set operating period and/or by considering a set number of switching-on processes of the hand-held power tool.

10. The method according to claim 1, comprising setting the reference duration value at a starting value less than or the same as the maximum permitted reference duration and greater than or the same as the minimal permitted reference duration at the time the hand-held power is first switched on.

11. A monitoring device for deep discharge protection of a supply battery of a hand-held power tool comprising a timer for determining an actual average ON-time of the hand-held power tool;

and a setting means for setting a reference duration for deep discharge protection of the supply battery as a function of the determined average ON-time of the hand-held power tool.

12. A hand-held power tool comprising the device for deep discharge protection of the supply battery according to claim 11.