Specific gravity transducer and battery performance indicator

• US 4,329,406 A
• Filed: 03/27/1981
• Issued: 05/11/1982
• Est. Priority Date: 03/27/1981
• Status: Expired due to Fees

• Current Assignee: Ernest A. Dahl, George H. Barry
• Original Assignee: Ernest A. Dahl, George H. Barry
• Inventors: Dahl, Ernest A., Barry, George H.
• Primary Examiner(s): Lefevour, Charles F.
• Application Number:
  US06/248,639
• Time in Patent Office: 410 Days
• Field of Search: 429/91-93, 429/7, 429/53, 429/72, 429/81, 429/67, 73/32 R, 73/440, 320/48, 324/432
• US Class Current: 429/92
• CPC Class Codes: H01M 10/484 for measuring electrolyte level, electrolyte density or electrolyte conductivity
• CPC Class Codes: H01M 50/70 Arrangements for stirring or circulating the electrolyte
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10S 320/18 Indicator or display

Abstract

A transducer and battery performance indicator which senses various levels of specific gravity and other conditions of a liquid or electrolyte of varying degrees of translucency and converts the measurements into electrical analog signals which are fed to an indicator read-out. The device may include temperature and level sensors, as well as an agitator for circulating electrolyte, and a number of them are used remotely to monitor a bank of batteries.

Claims

1. A battery performance indicator for measuring and monitoring battery conditions, comprising:

a. a specific gravity transducer operable to detect various values of specific gravity of a battery liquid electrolyte across a range of interest when said specific gravity transducer is submersed in the liquid electrolyte;

b. electronic circuit means connected to said specific gravity transducer for converting detection signals from said specific gravity transducer into electrical analog signals representative of the specific gravity of said liquid electrolyte;

c. read-out means electrically connected to said electronic circuit means for indicating the value of the specific gravity of said liquid electrolyte in response to analog signals from said electronic circuit means;

d. said specific gravity transducer, comprising;

a housing of dielectric material having a plurality of adjacent vertical channels disposed throughout said housing;

passage means for allowing liquid electrolyte flow from outside said housing throughout said housing and said vertical channels and return outside said housing;

each of said vertical channels containing a respective float means;

each said respective float means being adapted to float in said liquid electrolyte at a different predetermined specific gravity across a range of interest;

an emitting source located in said housing on one side of said vertical channels;

said emitting source being positioned and operable to radiate energy across one end of each of said vertical channels;

a plurality of receiver elements equal in number to the number of vertical channels;

one receiver element being positioned on the opposite side of each said vertical channel directly across from said emitting source;

each said receiver element being operable to receive radiated energy signals transmitted from said emitting source through said electrolyte and across the respective ends of said vertical channels;

each respective float means when coming between said emitting source and its respective receiver element being operable to attenuate the radiated energy signal from said emitting source that is received by the respective receiver element;

said attenuation by said respective float means of the radiation signals received by respective receiver elements operating to produce detection signals indicative of the specific gravity of the liquid electrolyte within the range of interest;

said detection signals being fed to said electronic circuit means and in turn to said read-out means;

e. a power source for providing electrical power to said transducer, said electronic circuitry and said read-out means.

2. A device as in claim 1 wherein said specific gravity transducer housing is cylindrical;

said vertical channels are positioned circumferentially about the interior of said housing;

said emitting source is located centrally within said housing and said receiver elements are located in the outer wall of said housing.

3. A device as in claim 1 wherein said specific gravity transducer housing comprises a plurality of flat modules sandwiched together;

a first module containing said emitting source;

a second module containing said vertical channels and their respective float means as well as said passage means for electrolyte flow; and

a third module containing said receiver elements.

4. A device as in claim 1 wherein said specific gravity transducer is located at the bottom of a battery cell cap, said electronic circuitry is located within the stem of said battery cell cap, and said read-out means is located at the top of said battery cell cap.

5. A device as in claim 4 wherein a gas vent and flame arrestor are provided in said battery cell cap.

6. A device as in claim 1 or 4 wherein said read-out means is located in a remote area for monitoring battery conditions in another location.

7. A device as in claim 1 or 4 wherein a temperature sensing means is provided in said stem for monitoring critical temperature conditions of the liquid electrolyte.

8. A device as in claim 1 or 4 wherein electrolyte level sensor means are included to detect low liquid electrolyte level.

9. A device as in claim 1 or 4 wherein agitator means is provided for circulating the liquid electrolyte.

10. A device as in claims 1, 2, 3 or 4 wherein a vibrator means is provided in said specific gravity transducer housing, said vibrator means being operable to prevent sticking of said floats due to film formation or surface tension.

11. A device as in claims 1 or 4 wherein ultrasonic agitator wings are provided to prevent stratification of the liquid electrolyte and reduce surface growth.

12. A device as in claims 1 or 4 wherein a rotary electric motor driven impeller is provided to circulate the liquid electrolyte and prevent surface growth.

13. A device as in claim 4 wherein a rotary electric motor driven impeller type agitator is provided for circulation of the liquid electrolyte;

said agitator, comprising;

a ring shaped impeller rotatably mounted for rotation about the stem of said battery cell cap;

said ring shaped impeller having circulation vanes on the outer wall and having a plurality of magnetic elements embedded in the wall thereof;

motor field coils being embedded in the wall of said stem located opposite said magnetic elements and connected to said electronic circuitry;

whereby a magnetic field generated in said field coils acts against said magnetic elements in the ring shaped impeller causing the impeller to rotate and circulate the electrolyte.

18. A device as in claims 1, 2, 14 and 15 wherein said vertical channels are formed from vertical guide means along interior walls of said housing.

14. A specific gravity transducer, comprising:

a. a housing of dielectric material operable to be immersed in a liquid and having a plurality of adjacent vertical channels disposed throughout said housing;

b. passage means for allowing flow of said liquid from outside said housing throughout said housing and said vertical channels and return outside said housing;

c. each of said vertical channels containing a respective float means;

each said respective float means being adapted to float in said liquid at a different predetermined specific gravity across a range of interest;

d. an emitting source located in said housing on one side of said vertical channels;

said emitting source being positioned and operable to radiate energy across one end of each of said vertical channels;

e. a plurality of receiver elements equal in number to the number of vertical channels;

one receiver element being positioned on the opposite side of each said vertical channel directly across from said emitting source;

each said receiver element being operable to receive radiated energy signals transmitted from said emitting source through said liquid and across the respective ends of said vertical channels;

f. each respective float means when coming between said emitting source and its respective receiver element being operable to attenuate the radiated energy signal from said emitting source that is received by the respective receive element;

g. said attenuation by said respective float means of the radiation signals received by respective receiver elements operating to produce detection signals indicative of the specific gravity of the liquid within the range of interest;

said detection signals being fed to a read-out means;

h. a power source for providing electrical power to said emitting source and receiver elements and to said read-out means.

15. A device as in claim 14 wherein said specific gravity transducer housing is cylindrical;

said vertical channels are positioned circumferentially about the interior of said housing;

said emitting source is located centrally within said housing and said receiver elements are located in the outer wall of said housing.

16. A device as in claim 14 wherein said specific gravity transducer housing comprises a plurality of flat modules sandwiched together;

a first module containing said emitting source;

a second module containing said vertical channels and their respective float means as well as said passage means for electrolyte flow; and

a third module containing said receiver elements.

17. A device as in claim 14 wherein a vibrator means is provided in said specific gravity transducer housing, said vibrator means being operable to prevent sticking of said floats due to film formation or surface tension.