Battery electrolyte level control system

• US 20060281000A1
• Filed: 05/30/2006
• Published: 12/14/2006
• Est. Priority Date: 05/28/2005
• Status: Abandoned Application

• Current Assignee: Aerovironment
• Original Assignee: Aerovironment
• Inventors: Hayashigawa, Larry
• Application Number:
  US11/444,120
• Publication Number:
  US 20060281000A1
• Time in Patent Office: Days
• US Class Current: 429/63
• CPC Class Codes: B66F 9/24 Electrical devices or systems
• CPC Class Codes: G01F 23/0007 for discrete indicating and measuring G01F23/02 - G01F23/28 take precedence
• CPC Class Codes: G01F 23/02 by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid
• CPC Class Codes: G05D 9/12 characterised by the use of electric means
• CPC Class Codes: H01M 10/4214 Arrangements for moving electrodes or electrolyte
• CPC Class Codes: H01M 10/484 for measuring electrolyte level, electrolyte density or electrolyte conductivity
• CPC Class Codes: H01M 50/673 Containers for storing liquids; Delivery conduits therefor
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An electrolyte level control system for adding a quantity of water to raise the electrolyte level in a forklift battery having a hydro-mechanical cutoff valve. The system includes a reservoir, a reservoir-level sensor, a transmitter, a distribution system, a battery-charge sensor, a solenoid valve, a battery electrolyte level sensor, and a battery-electrolyte control system that controls the position of the solenoid valve in light of the detection of a battery state of charge from the battery charge sensor, and the detection of the battery electrolyte level from the battery electrolyte level sensor. The system provides for watering the battery when the state of charge is full and the electrolyte level is not full.

Claims

1. An electrolyte level control system for adding a fluid to an electrolyte within a battery chamber defined by a battery carried by an electric vehicle, comprising:

a reservoir configured to contain a quantity of the fluid;

a battery-charge sensor configured to sense the state of charge of the battery; and

a battery-refill control system configured to control the distribution of the fluid from the reservoir to the battery chamber based upon the state of charge sensed by the battery-charge sensor.

2. The electrolyte level control system of claim 1, and further comprising a distribution system forming a passageway configured to place the reservoir in fluid communication with the battery chamber, wherein the battery-refill control system is configured to control the distribution of the fluid from the reservoir by controlling a valve in the distribution system.

3. The electrolyte level control system of claim 1, wherein the battery-refill control system is further configured to only allow distribution of the fluid from the reservoir to the battery chamber when the sensed battery state of charge is at a level that is above a threshold value.

4. The electrolyte level control system of claim 1, and further comprising a vehicle activity sensor configured to detect vehicle activity information, wherein the battery-refill control system is further configured to only allow distribution of the fluid from the reservoir to the battery chamber when the detected vehicle activity information indicates that the vehicle is not significantly active.

5. The electrolyte level control system of claim 1, and further comprising a reservoir level sensor capable of detecting information usable to identify lateral motion of the fluid within the reservoir, wherein the battery-refill control system is further configured to only allow distribution of the fluid from the reservoir to the battery chamber when the detected lateral motion information indicates that the fluid within the reservoir is not moving laterally.

6. The electrolyte level control system of claim 1, and further comprising a transmitter configured to transmit a reservoir-status signal containing information on the level of fluid within the reservoir.

7. The electrolyte level control system of claim 1, wherein the electrolyte level control system is configured to deactivate at least a portion of the vehicle when the reservoir level is below a threshold level.

8. The electrolyte level control system of claim 1, and further configured with a battery-electrolyte-level sensor configured to sense a level of electrolyte within the battery.

9. The electrolyte level control system of claim 8, wherein the electrolyte level control system is configured to deactivate at least a portion of the vehicle when the level of electrolyte within the battery is below a threshold level.

10. The electrolyte level control system of claim 8, wherein the battery-electrolyte control system is configured to control the distribution of water from the reservoir chamber to the battery chamber based upon the state of charge as sensed by the battery-charge sensor, and the level of electrolyte within the battery chamber as sensed by the battery-electrolyte-level sensor.

11. A method for adding a fluid to an electrolyte within a battery chamber defined by a battery carried by an electric vehicle, comprising:

sensing a state of charge of the battery; and

controlling the distribution of the fluid, from a reservoir configured to contain a quantity of the fluid, to the battery chamber, based upon the sensed state of charge.

12. The method of claim 11, wherein in the step of controlling the distribution, the distribution is further controlled to only allow distribution if the sensed battery state of charge is at a level that is above a threshold value.

13. The method of claim 11, and further comprising detecting vehicle activity information, wherein in the step of controlling the distribution, the distribution is further controlled to only allow distribution of the fluid from the reservoir to the battery chamber when the detected vehicle activity information indicates that the vehicle is not significantly active.

14. An electrolyte level control system for adding a fluid to an electrolyte within a battery chamber defined by a battery carried by an electric vehicle, comprising:

a means for sensing a state of charge of the battery; and

a means for controlling the distribution of the fluid, from a reservoir configured to contain a quantity of the fluid, to the battery chamber, based upon the sensed state of charge.

15. The electrolyte level control system of claim 14, wherein in the means for controlling is further configured to only allow distribution if the means for sensing senses battery state of charge information indicating a charge level above a threshold value.

16. The method of claim 14, and further comprising a means for detecting vehicle activity information, wherein the means for controlling is further configured to only allow distribution of the fluid from the reservoir to the battery chamber if the means for detecting detects vehicle activity information indicating that the vehicle is not significantly active.