System and method for monitoring electrolyte levels in a battery

• US 8,330,467 B2
• Filed: 09/07/2010
• Issued: 12/11/2012
• Est. Priority Date: 06/12/2003
• Status: Active Grant

• Current Assignee: Philadelphia Scientific LLC (Philadelphia Scientific)
• Original Assignee: Philadelphia Scientific LLC (Philadelphia Scientific)
• Inventors: Jones, Duncan, Worthingdon, John
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): Boateng, Alexis
• Application Number:
  US12/876,771
• Publication Number:
  US 20110135974A1
• Time in Patent Office: 826 Days
• Field of Search: 320/112, 320/132, 320/134, 320/135, 320/136, 320/137, 320/113, 320/114, 324/435, 324/425, 324/426, 324/429, 324/525, 324/430, 429/89, 429/91, 429/61, 429/90, 429/92, 340/620
• US Class Current: 324/426
• CPC Class Codes: B66F 9/24 Electrical devices or systems
• CPC Class Codes: G01F 23/80 Arrangements for signal processing
• CPC Class Codes: H01M 10/484 for measuring electrolyte level, electrolyte density or electrolyte conductivity
• CPC Class Codes: H01M 50/569 Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals battery terminal connectors with integrated measuring arrangements G01R31/364
• CPC Class Codes: H01M 6/505 Cells combined with indicating means for external visualization of the condition, e.g. by change of colour or of light intensity
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A measuring device is used in conjunction with a programmable controller for monitoring electrolyte levels in the battery. According to one implementation, the measuring device is located in a battery and is configured to detect when the electrolyte level in the battery falls below a particular level. The controller is in electrical communication with the electrolyte detection device. The controller is configured to: (i) receive a signal from the electrolyte level detection device indicating when the electrolyte level in the battery has fallen below the particular level; (ii) introduce a wait-period after the signal is received; and (iii) enable an indicator to indicate that the electrolyte level in the battery should be refilled when the wait-period expires.

Claims

1. A method of monitoring electrolyte levels in a battery, comprising:

detecting when the electrolyte level in the battery falls below a particular level;

introducing a wait-period when the electrolyte level in the battery is detected to have fallen below the particular level, and

indicating that the electrolyte level in the battery should be refilled after the wait-period expires.

2. The method as recited in claim 1, wherein the electrolyte level at the particular level is above a lowest safe level before the electrolyte level in the battery should be refilled.

3. The method as recited in claim 1, further comprising determining the wait-period by counting down a programmable-countdown-time after the electrolyte level in the battery falls below the particular level.

4. The method as recited in claim 1, further comprising determining the wait-period by monitoring how many charging cycles the battery experiences after the electrolyte level in the battery falls below the particular level.

5. The method as recited in claim 1, further comprising determining the wait-period by estimating a rate of electrolyte loss for the battery as a function of the age of the battery, after the electrolyte level in the battery falls below the particular level.

6. A method of monitoring electrolyte levels in a battery, comprising:

detecting when the electrolyte level in the battery falls below a particular level;

introducing a first wait-period when the electrolyte level in the battery is detected to have fallen below the particular level;

detecting whether the electrolyte level in the battery rises above the particular level during the first wait-period; and

resetting the first wait-period if the electrolyte level in the battery rises above the particular level during the first wait-period.

7. The method as recited in claim 6, further comprising:

introducing a second wait-period, after the first wait-period expires, if the electrolyte level in the battery does not rise above the particular level during the first wait-period.

8. The method as recited in claim 6, further comprising:

introducing a second wait-period, after the first wait-period expires, if the electrolyte level in the battery does not rise above the particular level during the first wait-period; and

indicating that the electrolyte level in the battery should be refilled, after the second wait-period expires.

9. A system for monitoring electrolyte levels in a battery, comprising:

an electrolyte detection device, located in a cell of the battery, configured to detect when the electrolyte level in the battery falls below a particular level; and

a controller, coupled to the electrolyte detection device, configured to (i) introduce a first wait-period when the electrolyte level in the battery is detected to have fallen below the particular level;

(ii) monitor, as indicated by the electrolyte detection device, whether the electrolyte level in the battery rises above the particular level during the first wait-period; and

(iii) reset the first wait-period if the electrolyte level in the battery rises above the particular level, as indicated by the electrolyte detection device, during the first wait-period.

10. The system as recited in claim 9, wherein the controller is further configured to (iv) introduce a second wait-period, after the first wait-period expires, if the electrolyte level in the battery does not rise above the particular level, as indicated by the electrolyte detection device, during the first wait-period;

and (v) indicate that the electrolyte level in the battery should be refilled, after the second wait-period expires.

11. The system as recited in claim 9, wherein the system is resident with the battery.

12. A battery, comprising:

a system for monitoring the electrolyte level in a battery, the system comprising;

a probe for sensing the electrolyte level in the battery; and

a controller, in electrical communication with the probe, operable in one of a selectable test mode and non-test mode, wherein when the test mode is selected the controller enables the probe to be energized for sensing whether the electrolyte level in the battery is above or below the probe, and wherein when the non-test mode is selected the controller enables the probe to be de-energized.