Battery monitoring system of cell groups and display

• US 4,931,738 A
• Filed: 01/27/1989
• Issued: 06/05/1990
• Est. Priority Date: 01/27/1989
• Status: Expired due to Fees

• Current Assignee: Kaufel Group Ltd
• Original Assignee: Kaufel Group Ltd
• Inventors: Graham, Richard D. II, Aldava, Michael B., MacIntyre, Hazen L.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Harvey, Jack B.
• Application Number:
  US07/303,452
• Time in Patent Office: 494 Days
• Field of Search: 324/426, 324/429, 324/433, 324/434, 324/435, 340/636, 340/660, 320/48
• US Class Current: 324/435
• CPC Class Codes: G01R 31/3646 for indicating electrical conditions or variables, e.g. visual or audible indicators
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

Abstract

A battery monitoring system has an LED matrix displaying plural battery group conditions. The matrix has a column defining reference row of LED indicators, each active LED representing an adjacent voltage range. The reference row is responsive to an average battery voltage of plural battery groups. Aligned in columns with the reference row LED'"'"'s are plural LED rows, each row representing an individual battery group. An active LED indicates an individual battery group voltage of the corresponding individual battery group. Analog multiplexing of scanned battery group voltages are sequentially applied to the matrix rows at a scan rate greater than the visual persistence of the LED'"'"'s so that at any given moment, an LED appears active in each row as well as in the reference row. To focus on a single battery group, a scan switch interrupts application of scanned battery voltages. A digital display also selectively indicates either overall plural battery groups voltage or individual battery group voltage.

Claims

1. Battery monitoring apparatus for observing the charge condition of a plurality of battery cell groups, each cell group comprising at least one cell, comprising:

a display panel having a multiplicity of visual display means for providing a separate quantitative indication of the charge condition of each one of the plurality of cell groups being monitored and of the plurality of cell groups collectively;

means for driving the visual display means in response to a measured voltage potential related to the condition of each cell group to cause the visual display means to exhibit separate quantitative visual displays corresponding to the measured voltage potential of each cell group; and

means for coupling the driving means to plural cell groups;

whereby the quantitative charge condition of a single cell group and of a plurality of cell groups may be individually determined by observation of said display panel to provide for diagnosis of cell group conditions for purposes of monitoring and replacement.

2. The invention as set forth in claim 1 wherein said apparatus includes digital readout means in synchronization with said visual display means to provide a visual digital indication responsive to the charge condition visual display means of the separate cell groups.

3. The invention as set forth in claim 2 and including:

means for sequentially scanning the electrical condition of plural cell groups;

means for interrupting a scanned display of plural cell groups for inspection of the electrical condition of a single cell group and for substantially simultaneously separately displaying the condition of the cells of plural cell groups upon such interruption; and

means for converting the indication relating to the single cell group being inspected from a collective indication to individual indications and causing the driver means to cause the visual display means to display an indication of the charge condition of the cells of a single cell group.

4. The invention as set forth in claim 3 and including means for providing an indication signal composite voltage condition of the plural cell groups sampled;

and means for displaying the composite signal.

5. The invention as set forth in claim 1 and including digital display means for reading composite voltage conditions of plural cell groups;

and wherein each of said visual display means comprise a plurality of adjacent indicators, each set of indicators being responsive to the voltage indication of a single cell group, each set having plural indicators, each of said indicators of a set being responsive to said driving means to represent a given voltage range of a cell group whereby only one indicator of each set responsive to the measured voltage is displayed in an "on" condition at any one time.

6. The invention as set forth in claim 5 and including multiplexing means for sampling voltages of plural cell groups and delivering a decoded signal representative of the voltage of each cell group at staggered time separated intervals to the indicator sets representative of the specific cell group sampled, the indicators of each indicator set having a period of visual persistence and the time intervals until the indicators of a given set are refreshed being less than the persistence of the indicators of each indicator set, whereby the indicators of the voltages of plural cell groups being scanned at substantially time discrete and spaced apart intervals sampling intervals, are simultaneously displayed individually by the indicator sets, visually in a continuously active state, the staggered sampling and application of signals to the separate indicator sets being substantially imperceptible to the observer.

7. Batter monitoring apparatus comprising:

an electrical battery arrangement comprising a plurality of cell groups, each cell group having at least a single electrical cell, each cell group having a measurable voltage;

means for remotely sampling the voltage of the cell groups individually;

means for automatically scanning the charge conditions of the cell groups and clusters thereof;

a display panel having a multiplicity of visual quantitative display means each having a multiplicity of visual indicators for separately visually displaying a selected one of plural quantitative indications in response to the voltage of a cell group sampled, the visual display means further including second similar visual quantative display means for providing a reference indication related to the overall charge condition of the electrical battery arrangement;

means for driving the multiplicity of visual display means and second display means, the driving means being responsive to the overall condition of the electrical battery arrangement and the condition of individual cell groups being sampled to effect apparent simultaneous display of the overall condition and the condition of the individual cell groups; and

means coupling the driving means to plural cell groups;

whereby individual charge conditions of a plurality of cell groups may be compared to the overall condition of the battery arrangement for purposes of monitoring and replacement.

8. The apparatus as set forth in claim 7 and in which the plural quantitative indicators have a visual persistence, the apparatus also including means for scanning and displaying the charge condition of a multiplicity of cell groups at sufficiently rapid intervals to overcome the level of persistence of the indicators and thereby appear to simultaneously and individually display voltage levels of separate cell groups.

9. The apparatus as set forth in claim 8 and including means for manually interrupting the scanning of clusters of cell groups for individually monitoring and displaying the voltage condition of an individual cell group, whereby attention can be focussed on the condition of individual cell groups, and means for restoring the automatic scanning to display the overall condition of the battery arrangement.

10. The apparatus as set forth in claim 9 and in which the plural indicators comprise a set of plural visual indicators responsive to each cell group, each of said plural visual indicators providing a display uniquely identifying a particular voltage range whereby it can be visually determined whether the activated voltage range indication is above or below a nominal voltage, and wherein there is included means for displaying a composite reference indication responsive to plural cell group voltages.

11. A battery discharge monitoring system comprising:

an electrical battery arrangement comprising a plurality of cell groups, each cell group having at least a single electrical cell;

means for providing a reference voltage;

interface means for remotely sampling the voltage condition of individual cell groups with respect to the reference voltage;

a visual display panel having a multiplicity of visual display means each comprising plural indicators for quantitatively providing a visual display in response to the relationship of the voltages sensed, said plural indicators of said multiplicity of visual display means separately and substantially simultaneously indicating a condition of plural cell groups; and

reference indication means for displaying a charge condition responsive to the overall condition of the electrical battery arrangement whereby the plural indicators responsive to the condition of the cell groups may be visually compared with the reference indication means to view and compare the condition of separate cell groups to the condition of the reference indication means;

whereby conditions of plurality of cell groups may be individually determined for purposes of monitoring, maintenance and replacement.

12. The system as set forth in claim 11 and in which the reference means comprises a reference row of said visual display means for illuminating and providing a visual indicator corresponding to an average voltage of a plurality of cell groups.

13. The system as set forth in claim 12 and in which the visual display comprises discrete visual indicators for a multiplicity of different charge ranges.

14. The system as set forth in claim 13 and in which said visual display panel includes a dot matrix of lamps providing said indicators, and further comprising a scan bar dot matrix driver coupled to said lamps.

15. The system as set forth in claim 14 and in which the system includes a programmable decoder coupled to a relay for providing relative voltages for each of the plural battery groups, and a programmable down counter coupled to the relay driver for selectively delivering an indication of the voltage level at time intervals.

16. The system as set forth in claim 15 and including:

a differential analog multiplexer coupled to a BCD input representative of separate cell groups during a particular time interval;

differential amplifier prescaler means for providing an average voltage indication signal to said reference row for providing a visual indication related to the average voltage condition of the plural cell groups; and

scan bar driver means responsive to the analog multiplexer, the scan bar driver being coupled to the lamp dot matrix for providing a visual display of individual cell groups.

17. The system as set forth in claim 16 and in which the lamp dot matrix comprises a plurality of rows, each row representing a different cell group, and in which the lamp being lit is representative of a voltage range for the cell group.

18. The system as set forth in claim 17 and in which the reference row comprises a plurality of lamps disposed in alignment with the lamp dot matrix, the reference row being responsive to the average voltage of the cell groups of the arrangement so as to illuminate a lamp representative of the average voltage range for the battery arrangement, whereby voltage ranges responsive to separate cell groups may be individually compared to the voltage range lamp of the reference row;

and

wherein said interface means has plural input circuits for sequentially coupling the differential analog multiplexer to separate plural groups of batteries, whereby separate battery groups can be scanned at sequential time intervals.

19. The system as set forth in claim 18 and including means for cycling the BCD data to the analog multiplexer and the BCD decoder above the flicker perception of the human eye, whereby indicators of multiple rows appear to be simultaneously illuminated.