Apparatus and method for identifying alternative cell chemistries for batteries

• US 10,159,770 B2
• Filed: 01/09/2014
• Issued: 12/25/2018
• Est. Priority Date: 03/12/2013
• Status: Active Grant

• Current Assignee: KCI Licensing Incorporated (3M Company)
• Original Assignee: KCI Licensing Incorporated (3M Company)
• Inventors: Locke, Christopher Brian, Coulthard, Richard Daniel John, Blandford, David Robson
• Primary Examiner(s): Mensh, Andrew J
• Application Number:
  US14/151,459
• Publication Number:
  US 20140276487A1
• Time in Patent Office: 1,811 Days
• Field of Search: 604319
• CPC Class Codes: A61M 1/71 Suction drainage systems containers therefor A61M1/60, A61M1/64; negative pressure wound therapy systems A61M1/90
• CPC Class Codes: A61M 1/732 Visual indicating means for vacuum pressure
• CPC Class Codes: A61M 1/80 Suction pumps A61M1/64, A61M1/71, A61M60/00 take precedence
• CPC Class Codes: A61M 1/91 Suction aspects of the dressing
• CPC Class Codes: A61M 1/966 having a pressure sensor on or near the dressing
• CPC Class Codes: A61M 2205/8206 battery-operated
• CPC Class Codes: A61M 2209/088 on the body
• CPC Class Codes: G01R 31/378 specially adapted for the type of battery or accumulator
• CPC Class Codes: G01R 31/386 using test-loads
• CPC Class Codes: H01M 10/4221 with battery type recognition
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569

Abstract

New and useful systems, methods, and apparatuses for automatically identifying alternative cell chemistries of batteries that power portable electric devices and adjusting the characteristics of such devices in response to the identification of such cells in a reduced-pressure therapy environment are set forth in the appended claims.

Claims

1. A system for treating a tissue site with reduced pressure including an electronic device for identifying the cell chemistry of a battery inserted therein, the system comprising:

a dressing including a manifold for providing a reduced-pressure treatment space to the tissue site, a sealing member for sealing the manifold within the reduced-pressure treatment space, and a reduced-pressure interface coupled to the sealing member for providing reduced pressure to the manifold;

a reduced-pressure source including a vacuum pump and a motor for driving the vacuum pump, the vacuum pump fluidly coupled to the reduced-pressure interface to provide reduced pressure to the manifold;

a motor drive having an input and an output operatively coupled to the motor;

a test circuit including a resistor and a switch electrically connected in series and having two electrical contacts configured to be connected to the battery when inserted into the electronic device, the switch being actionable between an open position to provide an open circuit voltage (V_O) of the battery and a closed position to provide a load voltage (V_L) of the resistor, the test circuit having an output providing a battery-identifier output signal including the open circuit voltage (V_O) and the load voltage (V_L); and

a controller electrically coupled to the output of the test circuit and the input of the motor drive, the controller being responsive to the battery-identifier output signal and configured to selectively adjust the aggression of the motor drive as determined by the cell chemistry of the battery and identified by the battery-identifier output signal.

2. The system of claim 1, wherein the test circuit further comprises a computer having a program for determining whether the electronic device has been powered up by the battery, measuring the open circuit voltage (V_O) of the battery, measuring the load voltage (V_L) of the resistor, calculating a percent voltage drop (V_L/V_O) resulting from connecting the resistor to the battery, and using these three values in connection with an algorithm to determine the cell chemistry of the battery for providing the battery-identifier output signal.

3. The system of claim 2, wherein the algorithm determines that the battery has a lithium cell chemistry if V_O is greater than or equal to 1.65V and V_L is greater than or equal to 0.55V_O and provides the battery identifier output signal to the controller which adjusts a characteristic of the electronic device to function with a battery having a lithium cell chemistry.

4. The system of claim 2, wherein the algorithm determines that the battery has a zinc carbon cell chemistry if V_L is less than 0.45V_O and provides the battery identifier output signal to the controller which adjusts a characteristic of the electronic device to function with a battery having a zinc carbon cell chemistry.

5. The system of claim 2, wherein the algorithm determines that the battery has an alkaline cell chemistry if V_L is less than 0.55V_O but greater than 0.45V_O and provides the battery identifier output signal to the controller which adjusts a characteristic of the electronic device to function with a battery having an alkaline cell chemistry.

6. The system of claim 1, wherein the battery comprises one or more cells (n), the resistor has a resistance of R, and when the switch is turned to the closed position, the resistor has a resistance of 0.25R(n).

7. The system of claim 1, wherein the load voltage (V_L) of the resistor is measured only once.