Charging device for charging a plurality of batteries based on parameter priority

• US 5,539,297 A
• Filed: 10/17/1994
• Issued: 07/23/1996
• Est. Priority Date: 05/15/1992
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Fiebig, Arnim
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): TOATLEY, GREGORY J
• Application Number:
  US08/318,799
• Time in Patent Office: 645 Days
• Field of Search: 429/99-100, 320/15, 320/18, 320/39, 320/48, 320/20, 320/21, 320/49
• US Class Current: 320/126
• CPC Class Codes: H02J 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection
• CPC Class Codes: H02J 7/007194 of the battery

Abstract

The charging device for charging a plurality of rechargeable batteries according to the invention includes at least two sensors associated with each rechargeable battery for measuring a measurable parameter, e.g. voltage, temperature, etc, of the rechargeable battery associated therewith; switchable devices for electrically connecting one or more rechargeable batteries at a time for charging; a control device for selecting rechargeable batteries for charging in an order determined by measured values of the measurable parameters obtained from the sensors associated with each rechargeable battery. The control device includes a device for weighting the measured parameters of each of the rechargeable batteries according to a priority factor to obtain weighted combined values, a device for comparing said weighted combined values to at least one predetermined limiting value to determine the order in which the rechargeable batteries are selected for charging and a device for controlling the switchable device to connect the rechargeable batteries for charging according to that order.

Claims

1. A charging device for charging a plurality of rechargeable batteries, said charging device comprising:

a plurality of battery chambers, each of said battery chambers including means for holding one of said rechargeable batteries;

at least two sensors associated with each of said rechargeable batteries, each of said at least two sensor devices including means for measuring a measurable parameter of said rechargeable battery associated therewith;

switchable means for electrically connecting at least one of said rechargeable batteries at a time for charging;

control means for selecting said rechargeable batteries for charging in an order determined by measured values of said measurable parameters obtained from said at least two sensors associated with each of said rechargeable batteries,

wherein said control means includes means for weighting said measured parameters of each of said rechargeable batteries according to a predetermined priority factor to obtain weighted combined values, means for comparing said weighted combined values of said measured parameters to at least one predetermined limiting value to determine said order in which said rechargeable batteries are selected for charging and means for controlling said switchable means to connect said rechargeable batteries for charging according to said order.

2. The charging device as defined in claim 1, wherein said switchable means for electrically connecting said at least one of said rechargeable batteries at a time for charging includes means for connecting all of said rechargeable batteries in parallel to each other for charging and said control means includes means for interrogating said at least two sensors of each of said rechargeable batteries one after the other to obtain said measured parameters for each of said rechargeable batteries.

3. The charging device as defined in claim 1, wherein said control means includes means for switching off a charging voltage in each of said battery chambers in which one of said rechargeable batteries is not held therein.

4. The charging device as defined in claim 1, wherein one of said at least two sensors for each of said rechargeable batteries measures battery voltage.

5. The charging device as defined in claim 1, wherein one of said at least two sensors for each of said rechargeable batteries measures battery temperature.

6. The charging device as defined in claim 1, wherein said control means has means for starting a charging of said rechargeable batteries by charging one of said rechargeable batteries having a lowest temperature of all of said rechargeable batteries in said battery chambers, said lowest temperature being measured by one of said at least two sensors.

7. The charging device as defined in claim 1, wherein said control means includes means for beginning a charging of said rechargeable batteries by charging one of said rechargeable batteries in said battery chambers having a lowest voltage of all of said rechargeable batteries in said battery chambers as determined by one of said at least two sensors for each of said rechargeable batteries.

8. The charging device as defined in claim 1, further comprising a quick-charging power supply for quick-charging of said rechargeable batteries connectable by said control means and said switchable means with said rechargeable batteries, said quick-charging power supply including means for recharging at least one of said rechargeable batteries in minutes.

9. The charging device as defined in claim 1, which is pocket-sized and portable.