US5489835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cell type determination of battery under charge conditions
Assignee: Hewlett Packard Development Co LP
•
Filing: 1994-04-14
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Granted: 1996-02-06
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Expires: 2014-04-14
Abstract
Abstract The cell type (i.e. alkaline, Ni-Cd, etc.) of a battery is determined by reference to characteristics of its electrical behavior during charging. Exemplary characteristics include the magnitude of the initial voltage rise and the rate of initial voltage rise. Depending on the outcome of this determination, the charging conditions can be changed (e.g. the charging current can be interrupted if the cell is determined to be a non-rechargeable type). The invention finds particular utility in connection with electronic products such as calculators and portable computers.
Inventors
- 👤 Charles S. Stephens
- 👤 Dennis Schloeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:43
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/36; G01R31/378; H; H02; H02J; H02J7/00; H02J7/40; H02J7/443; H02J7/485; Y; Y10; Y10S; Y10S320/00; Y10S320/18
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
77 words
A method for determining the cell technology of a battery when charging, comprising: applying a DC charging current to the battery; monitoring the terminal voltage of the battery to determine an initial charging characteristic of the battery terminal voltage relating to the applied DC charging current; correlating the characteristic with known characteristics of at least first and second cell technologies; and producing an output signal responsive to said correlation to indicate the cell technology of the battery.
Claim 2
Independent Claim
77 words
A method for determining the cell technology of a battery when charging, comprising: applying a DC charging current to the battery; monitoring the terminal voltage of the battery to determine an initial charging characteristic of the battery terminal voltage relating to the applied DC charging current; correlating the characteristic with known characteristics of at least first and second cell technologies; and producing an output signal responsive to said correlation to indicate the cell technology of the battery.
Claim 3
Dependent Claim
40 words
The method of claim 1 in which the correlating step includes: providing a signal related to the monitored characteristic; and comparing said signal with a reference signal to determine whether the battery is of the first or second cell technologies.
Claim 4
Dependent Claim
18 words
The method of claim 1 which further includes changing the charging current in response to the output signal.
Claim 5
Dependent Claim
23 words
The method of claim 3 which includes interrupting the charging current if the battery is indicated to be of a non-rechargeable cell technology.
Claim 6
Dependent Claim
20 words
The method of claim 1 in which the characteristic is the magnitude of initial rise of the battery terminal voltage.
Claim 7
Dependent Claim
20 words
The method of claim 1 in which the characteristic is the rate of initial rise of the battery terminal voltage.
Claim 8
Dependent Claim
19 words
The method of claim 1 which includes providing a visual indication of cell technology responsive to the output signal.
Claim 9
Independent Claim
90 words
An apparatus for determining the cell technology of a battery being charged, comprising: a current source connectable to a battery for applying a DC charging current thereto; monitoring circuitry adapted for coupling to the battery and for monitoring an initial electrical parameter thereof relating to the applied DC charging current; comparator circuitry coupled to the monitoring circuitry for comparing the monitored parameter with a reference parameter; and indicating circuitry coupled to the comparator circuitry for producing an indication of whether the monitored parameter corresponds to first or second cell technologies.
Claim 10
Independent Claim
90 words
An apparatus for determining the cell technology of a battery being charged, comprising: a current source connectable to a battery for applying a DC charging current thereto; monitoring circuitry adapted for coupling to the battery and for monitoring an initial electrical parameter thereof relating to the applied DC charging current; comparator circuitry coupled to the monitoring circuitry for comparing the monitored parameter with a reference parameter; and indicating circuitry coupled to the comparator circuitry for producing an indication of whether the monitored parameter corresponds to first or second cell technologies.
Claim 11
Dependent Claim
19 words
The apparatus of claim 8 wherein the monitoring circuitry monitors a magnitude of initial rise of battery voltage parameter.
Claim 12
Dependent Claim
19 words
The apparatus of claim 8 wherein the monitoring circuitry monitors a rate of initial rise of battery voltage parameter.
Claim 13
Dependent Claim
13 words
The apparatus of claim 8 in which the indicating circuitry includes a meter.
Claim 14
Dependent Claim
26 words
The apparatus of claim 8 wherein the indicating circuitry produces an output signal indicative of whether the monitored parameter corresponds to first or second cell technologies.
Claim 15
Dependent Claim
25 words
The apparatus of claim 12 which includes a differentiator circuit in the monitoring circuitry for producing a signal related to a rate of parameter change.
Claim 16
Dependent Claim
19 words
The apparatus of claim 12 which includes circuitry for changing the charging current in response to the output signal.
Claim 17
Dependent Claim
19 words
The apparatus of claim 14 which includes circuitry for interrupting the charging current in response to the output signal.
Claim 18
Independent Claim
79 words
A method for determining the cell technology of a battery when charging, comprising: applying a substantially constant charging current to the battery; monitoring the terminal voltage of the battery to determine an initial charging characteristic of the total battery terminal voltage relating to the substantially constant charging current; correlating the characteristic with known characteristics of at least first and second cell technologies; and producing an output signal responsive to said correlation to indicate the cell technology of the battery.
Claim 19
Independent Claim
79 words
A method for determining the cell technology of a battery when charging, comprising: applying a substantially constant charging current to the battery; monitoring the terminal voltage of the battery to determine an initial charging characteristic of the total battery terminal voltage relating to the substantially constant charging current; correlating the characteristic with known characteristics of at least first and second cell technologies; and producing an output signal responsive to said correlation to indicate the cell technology of the battery.
Claim 20
Dependent Claim
26 words
The method of claim 16 comprising: monitoring the terminal voltage of the battery to determine the magnitude of initial rise of the total battery terminal voltage.
Claim 21
Dependent Claim
26 words
The method of claim 16 comprising: monitoring the terminal voltage of the battery to determine the rate of initial rise of the total battery terminal voltage.
Claim 22
Independent Claim
78 words
A method for determining the cell technology of a battery when charging, comprising: applying a substantially constant charging current to the battery; monitoring the terminal voltage of the battery to determine a characteristic of the initial rise of battery terminal voltage after the charging current is applied; correlating the characteristic with known characteristics of at least first and second cell technologies; and producing an output signal responsive to said correlation to indicate the cell technology of the battery.
Claim 23
Independent Claim
78 words
A method for determining the cell technology of a battery when charging, comprising: applying a substantially constant charging current to the battery; monitoring the terminal voltage of the battery to determine a characteristic of the initial rise of battery terminal voltage after the charging current is applied; correlating the characteristic with known characteristics of at least first and second cell technologies; and producing an output signal responsive to said correlation to indicate the cell technology of the battery.
Claim 24
Dependent Claim
26 words
The method of claim 19 comprising: monitoring the terminal voltage of the battery to determine the magnitude of initial rise of the total battery terminal voltage.
Claim 25
Dependent Claim
26 words
The method of claim 19 comprising: monitoring the terminal voltage of the battery to determine the rate of initial rise of the total battery terminal voltage.
References Cited (Backward Citations)
US3723285A
Cited
US3852652A
Cited
US4388582A
Cited
US4416957A
Cited
US4463307A
Cited
US4639655A
Cited
US4622508A
Cited
US4577144A
Cited
US4746852A
Cited
US4849682A
Cited
EP0479249A2
Cited
US5111128A
Cited
US5349281A
Cited
US5184059A
Cited
US5355073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-05 | 1999-08-07 | 2000-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-05 | 2003-08-07 | 2004-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-05 | 2007-08-07 | 2008-02-06 | $7700.00 | Window Closed / Lapsed |