Electrical appliance with automatic valve especially for fluid depolarized electrochemical battery

• US 5,541,016 A
• Filed: 05/12/1995
• Issued: 07/30/1996
• Est. Priority Date: 05/20/1992
• Status: Expired due to Term

• Current Assignee: Brooke Schumm III, Brooke Schumm Jr, Elizabeth Schumm, Kari J. Schumm
• Original Assignee: Brooke Schumm Jr
• Inventors: Schumm, Brooke Jr.
• Primary Examiner(s): Kalafut, Stephen
• Assistant Examiner(s): NUZZOLILLO, MARIA
• Application Number:
  US08/440,079
• Time in Patent Office: 445 Days
• Field of Search: 429/27, 429/33, 429/34, 429/39
• US Class Current: 429/402
• CPC Class Codes: F15C 5/00 Manufacture of fluid circuit elements; Manufacture of assemblages of such elements integrated circuits
• CPC Class Codes: F16K 2099/0074 using photolithography, e.g. etching
• CPC Class Codes: F16K 2099/008 Multi-layer fabrications
• CPC Class Codes: F16K 2099/0082 Microvalves adapted for a particular use
• CPC Class Codes: F16K 99/0001 Microvalves microdevices B81B1/00; manufacture or treatment of devices or systems in or on a substrate B81C1/00; microfluidic structures B01L3/5027; micropumps F04B19/006
• CPC Class Codes: F16K 99/0005 Lift valves
• CPC Class Codes: F16K 99/0011 Gate valves or sliding valves
• CPC Class Codes: F16K 99/0015 Diaphragm or membrane valves
• CPC Class Codes: F16K 99/0034 Operating means specially adapted for microvalves
• CPC Class Codes: F16K 99/0044 using thermo-electric means
• CPC Class Codes: H01M 12/06 with one metallic and one gaseous electrode
• CPC Class Codes: H01M 2200/10 Temperature sensitive devices
• CPC Class Codes: H01M 50/317 Re-sealable arrangements
• CPC Class Codes: H01M 50/375 Vent means sensitive to or responsive to temperature
• CPC Class Codes: H01M 50/574 Devices or arrangements for the interruption of current
• CPC Class Codes: H01M 6/50 Methods or arrangements for servicing or maintenance, e.g. for maintaining operating temperature constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569

Abstract

The placement in an electrical appliance of one or more tiny electrically activated thermally responsive semiconductor microactuators (a "valve-on-a-chip") disposed over the fluid entrance inlet(s) to regulate fluid flow to a gas depolarized electrochemical battery creates an efficient gas depolarized electrochemical power supply and appliance which permits the entrance of oxygen from air to the battery only when the battery is supplying electrical power to a load. Power for the valve is preferably derived from the battery itself but could be provided by a separate source within or without the battery. This tiny valve acts as a safety pressure vent and can act as a safety fuse as well. When electrical power is not required from the battery, the valve excludes entry of harmful impurities and unneeded fluid reactants thereby increasing the life of the battery during storage or when the electrical appliance the battery is powering is idle. A resistance means in parallel to the actuator valve is useful to enhance the operation of the power supply. If the battery leaks, the corrosive fluid causes the valve and/or battery to cease to operate. The potential combination with a recharging apparatus is also useful. The appliance may be designed to regulate the flow of reactant.

Claims

1. An electrical appliance, having a sealed case surrounding a battery having at least one fluid depolarized electrochemical cell, and being powered by said battery, comprising:

at least one semiconductor microactuator valve means for allowing the admission of depolarizing fluid only when said valve means is operated;

means for actuating said electrical appliance with at least an "on" position;

means for electrically connecting said means for actuating said electrical appliance in series with said battery and said at least one valve; and

means for disposing said at least one valve means on said case as the sole means for admitting depolarizing fluid into said case, so that when said means for actuating said electrical appliance is operated to said "on" position, said valve means allows the admission of fluid into said case to operate said battery.

2. The electrical appliance as in claim 1 wherein said at least one valve means acts as a pressure relief valve to allow excess pressure to exit said battery at a predetermined level.

3. The electrical appliance as a claim 2 further comprising recharging means for connection to said battery for recharging said battery.

4. The electrical appliance as in claim 3 further comprising measurement means and control means responsive to said measurement means for connection to said battery for preventing overcharging of said battery.

5. The electrical appliance as in claim 4 further comprising means for insulating a heating element located inside of said at least one valve means from said at least one valve means'"'"' body in order for said heating element to fail if overcurrent flows through said at least one valve means.

6. The electrical appliance as in claim 5 further comprising control means having a microprocessor for being connected to said battery in order to optimize said battery'"'"'s performance for a given electrical load.

7. The electrical appliance as in claim 6 further comprising fluid circulation means and fluid circulation control means for connection to said battery to circulate fluid through said battery.

8. The electrical appliance as in claim 7 wherein said valve means and said actuation means cooperate to cause said battery to cease to operate upon leakage of corrosive fluid from said battery to minimize damage to said electrical device which said battery is powering.

9. An electrical appliance, having a sealed housing surrounding a battery having at least one fluid depolarized electrochemical cell, and being powered by said at least one cell, comprising:

at least one semiconductor microactuator valve means for allowing the admission of depolarizing fluid into said sealed housing only when said valve means is operated, having a case, and containing at least one slide means for occluding fluid flow into said case having at least two grids of apertures and having an open position and a normally closed position;

means for actuating said electrical appliance having at least an on position and an off position;

means for electrically connecting said means for actuating said electrical appliance in series with said battery and said at least one valve means;

means for disposing said slide means on said case for occluding fluid flow and as the sole means for admitting depolarizing fluid into said case so that in said open position, the slide means provides the sole means for admission of depolarizing fluid into said case and in said normally closed position, said slide means seals said case; and

means for mechanically coupling each said at least one valve means to each said at least one slide means so that when said means for actuating said electrical appliance is operated to said on position, said valve means moves said slide means to said open position, and depolarizing fluid is admitted into said case to operate said battery and when said means for actuating said electrical appliance is operated to said off position, said valve means moves said slide means to said normally closed position.

10. The improved electrical appliance as in claim 9 wherein said at least one valve means acts as a pressure relief valve to allow excess pressure to exit said battery at a predetermined level.

11. The electrical appliance as in claim 10 further comprising recharging means for connection to said battery for recharging said battery.

12. The electrical appliance as in claim 11 further comprising measurement means and control means responsive to said measurement means for connection to said battery for preventing overcharging of said battery.

13. The electrical appliance as in claim 12 further comprising means for insulating a heating element located inside of said at least one valve means from said at least one valve means'"'"' body in order for said heating element to fail if overcurrent flows through aid at least one valve means.

14. The electrical appliance as in claim 13 further comprising control means having a microprocessor for being connected to said battery in order to optimize said battery'"'"'s performance for a given electrical load.

15. The electrical appliance as in claim 14 further comprising fluid circulation means and fluid circulation control means for connection to said battery to circulate fluid through said battery.

16. The electrical appliance as in claim 15 wherein said valve means and said actuation means cooperate to cause said battery to cease to operate upon leakage of corrosive fluid from said battery to minimize damage to said electrical device which said battery is powering.

17. An electrical appliance, having a sealed case surrounding a battery having at least one fluid depolarized electrochemical cell, and being powered by said battery, comprising:

means for actuating said electrical appliance;

at least one semiconductor microactuator valve means, said valve means having a normally "closed" position, having two terminals, and having means for occluding fluid flow, said means for occluding fluid flow having two juxtaposed parallel grids of apertures so that in said normally "closed" position, said grids of apertures occlude fluid flow into said valve;

means for disposing said valve means on said case to provide the sole means for admission of depolarizing fluid into said case;

electrical resistance means on one of said at least two means for occluding fluid flow;

means for electrically connecting said electrical resistance means to said two terminals; and

means for connecting said means for actuating said electrical appliance, said battery and said terminals in series with said electrical appliance in order to heat said electrical resistance means upon operation of said means for actuating said electrical appliance, causing one of said grids of apertures to flex so that said grids of apertures are no longer juxtaposed which unseals said valve means allowing depolarizing fluid to be admitted into said case through at least one of said grids of apertures.

18. An electrical appliance according to claim 17, further comprising;

an additional plate juxtaposed parallel to said means for occluding fluid flow made of two juxtaposed parallel grids of apertures, said means for occluding fluid flow having one said grid immediately adjacent to said additional plate;

means for connecting said additional plate through said one said grid immediately adjacent to said additional plate to said grid not adjacent to said additional plate;

said at least one semiconductor microactuator valve means containing a liquid and having electrical resistance means for heating said liquid;

means for disposing said liquid within said valve means adjacent to and sealed by said additional plate for heating by said electrical resistance means to cause said liquid to be heated and to expand upon operation of said apparatus, causing said additional plate, through said means for connecting said additional plate, to flex said grid not adjacent to said additional plate so that said grids of apertures are no longer juxtaposed which unseals said valve means allowing depolarizing fluid to be admitted into said case through said at least one of said grids of apertures.

19. The electrical appliance as in claim 18 wherein said at least one valve means acts as a pressure relief valve to allow excess pressure to exist said battery at a predetermined level.

20. The electrical appliance as in claim 19 further comprising recharging means for connection to said battery for recharging said battery.

21. The electrical appliance as in claim 20 further comprising measurement means and control means responsive to said measurement means for connection to said battery for preventing overcharging of said battery.

22. The electrical appliance as in claim 21 further comprising means for insulating a heating element located inside of said at least one valve means from said at least one valve means'"'"' body in order for said heating element to fail if overcurrent flows through said at least one valve means.

23. The electrical appliance as in claim 22 further comprising control means having a microprocessor for being connected to said battery in order to optimize said battery'"'"'s performance for a given electrical load.

24. The electrical appliance as in claim 23 further comprising fluid circulation means and fluid circulation control means for connection to said battery to circulate fluid through said battery.

25. The electrical appliance as in claim 24 wherein said valve means and said actuation means cooperate to cause said battery to cease to operate upon leakage of corrosive fluid from said battery to minimize damage to said electrical device which said battery is powering.

26. A method of regulating depolarizing fluid flow into an electric appliance powered by a fluid depolarized electrochemical battery having at least one cell and having a sealed housing surrounding said battery, comprising:

disposing a semiconductor microactuator valve means for being the sole means of entry of depolarizing fluid into said sealed housing, said valve means having two terminals, inlet means and means for flexing upon application of heat to said means for flexing, which said means for flexing is mechanically or electromechanically coupled to a slide means having at least two parallel, juxtaposed grids of apertures disposed to cover said inlet means to occlude fluid flow into said valve means and said battery when said battery is not operating;

affixing one of said grids of apertures to said valve means case;

connecting an electrical resistance means between said two terminals;

disposing said electrical resistance means to heat said means for flexing upon application of heat;

connecting said two terminals in series with said battery, said appliance, and a means for actuating said appliance;

disposing said at least one other grid of apertures in said slide means to slide, upon operation of said means for actuating said appliance, to admit depolarizing fluid into said appliance.

27. The method as in claim 26, further comprising:

applying a pressure mechanically or electromechanically open said at least one valve means at a predetermined level.

28. The method as in claim 27, further comprising:

connecting a recharging means to said battery for recharging said cell.

29. The method as in claim 28, further comprising:

connecting measurement means and control means responsive to said measurement means to said battery for preventing overcharging of said cell.

30. The method as in claim 29, further comprising:

connecting shunt resistance means to said at least one valve means.

31. The method as in claim 30, further comprising:

connecting control means having a microprocessor to said battery for optimizing said battery'"'"'s performance under a given electrical load.

32. The method as in claim 31, further comprising:

circulating fluid through said battery via fluid circulation means and fluid circulation control means.

33. The method as in claim 32, further comprising:

disposing an additive oxidizer in said active cathode of said at least one cell of said battery.

34. The method as in claim 33, further comprising:

disposing means for insulating a heating element located inside said at least one valve means from said at least one valve means'"'"' body so that said heating element fails if overcurrent flows through said at least one valve.

35. The method of regulating fluid flow into an electrical appliance as in claim 34, further comprising:

incorporating said one of said grids of apertures of said slide means which is disposed across said inlet means into said valve means case.