US3852652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid battery charging system and method
Assignee: Motorola Solutions Inc
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Filing: 1973-08-06
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Granted: 1974-12-03
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Expires: 1993-08-06
Abstract
Abstract A thermistor is internally mounted in a sealed nickel cadmium battery to be charged so as to sense the internal temperature of the battery and is electrically connected in a bridge to provide an electrical indication of the temperature of the battery. The electrical signal from the bridge is differentiated once to provide a signal representative of the rate of change of the temperature. A fast charging current is applied to the battery when the differentiated signal is below a predetermined amplitude and the temperature of the battery is within a predetermined range.
Inventors
- 👤 L Jasinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:08
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/90; H02J7/971; H02J7/975; H02J7/977
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
140 words
A system for rapidly charging a battery comprising: a. temperature sensing means coupled to the battery for sensing changes of temperature within the battery; b. conversion means connected to said temperature sensing means for converting the temperature sensed by said sensing means to an electrical signal; c. a differentiating circuit connected to said conversion means for receiving the electrical signal therefrom and differentiating it once to provide a signal representative of the rate of change of the temperature; d. power supply means; and e. charge control means connected to said differentiating circuit and including first and second charging circuits connecting said power supply means to the battery for charging the battery at a first rate when the signal from the differentiating circuit is below a predetermined amplitude and at a second rate when the signal is above the predetermined amplitude.
Claim 2
Independent Claim
140 words
A system for rapidly charging a battery comprising: a. temperature sensing means coupled to the battery for sensing changes of temperature within the battery; b. conversion means connected to said temperature sensing means for converting the temperature sensed by said sensing means to an electrical signal; c. a differentiating circuit connected to said conversion means for receiving the electrical signal therefrom and differentiating it once to provide a signal representative of the rate of change of the temperature; d. power supply means; and e. charge control means connected to said differentiating circuit and including first and second charging circuits connecting said power supply means to the battery for charging the battery at a first rate when the signal from the differentiating circuit is below a predetermined amplitude and at a second rate when the signal is above the predetermined amplitude.
Claim 3
Dependent Claim
19 words
A system as claimed in claim 1 wherein the temperature sensing means includes a thErmistor located in the battery.
Claim 4
Dependent Claim
23 words
A system as claimed in claim 2 wherein the conversion means includes a bridge circuit with the thermistor connected in one leg thereof.
Claim 5
Dependent Claim
62 words
A system as claimed in claim 1 wherein the charge control means includes temperature control means connected to receive the electrical signal from the conversion means and provide a signal to activate the first charging circuit when the electrical signal lies within a predetermined range and a signal to activate the second charging circuit when the electrical signal exceeds the predetermined range.
Claim 6
Dependent Claim
53 words
A system as claimed in claim 4 wherein the second charging circuit includes a resistive element connected in series with the battery and the power supply means and the first charging circuit includes a silicon controlled rectifier having an anode and a cathode connected in parallel with said resistive element and a gate.
Claim 7
Dependent Claim
32 words
A system as claimed in claim 5 including in addition an OR type circuit having a plurality of inputs connecting the charge control means to the gate of the silicon controlled rectifier.
Claim 8
Dependent Claim
95 words
A system as claimed in claim 6 wherein the temperature control means includes first and second circuits connected between the conversion means and two inputs of the OR type circuit, a signal on any of the plurality of inputs to the OR type circuit activating the silicon controlled rectifier, said first circuit providing a signal when the electrical signal from the conversion means is below the lower value of the predetermined range, and said second circuit providing a signal when the electrical signal from the conversion means exceeds the upper value of the predetermined range.
Claim 9
Dependent Claim
17 words
A system as claimed in claim 7 wherein the second circuit includes a circuit having hysteresis therein.
Claim 10
Dependent Claim
26 words
A system as claimed in claim 7 wherein a third input of the OR type circuit is connected to receive the signal from the differentiating circuit.
Claim 11
Dependent Claim
32 words
A system as claimed in claim 1 including in addition indicating means connected to the charge control means for indicating when the first charging circuit and the second charging circuit are operating.
Claim 12
Dependent Claim
16 words
A system as claimed in claim 1 wherein the battery is a sealed nickel cadmium battery.
Claim 13
Independent Claim
169 words
A system for rapidly charging a battery from a power supply and wherein the battery has an internally mounted thermistor for indicating the internal temperature of the battery, comprising; a. an electrical conversion circuit having terminals for connection to the thermistor of the battery, said circuit providing a first electrical signal representative of the temperature of the battery by converting the thermistor resistance variation into an electrical signal; b. an electrical monitoring circuit connected to said conversion circuit for receiving the first electrical signal therefrom and converting such signal to a second electrical signal representing the rate of change of the temperature of the battery; and c. charge control means connected to said monitoring circuit and including means for connecting the power supply means to the battery for charging the battery at a first rate when the second electrical signal from said monitoring circuit is below a predetermined level, and for charging the battery at a reduced rate when the said second electrical signal is above a predetermined level.
Claim 14
Independent Claim
169 words
A system for rapidly charging a battery from a power supply and wherein the battery has an internally mounted thermistor for indicating the internal temperature of the battery, comprising; a. an electrical conversion circuit having terminals for connection to the thermistor of the battery, said circuit providing a first electrical signal representative of the temperature of the battery by converting the thermistor resistance variation into an electrical signal; b. an electrical monitoring circuit connected to said conversion circuit for receiving the first electrical signal therefrom and converting such signal to a second electrical signal representing the rate of change of the temperature of the battery; and c. charge control means connected to said monitoring circuit and including means for connecting the power supply means to the battery for charging the battery at a first rate when the second electrical signal from said monitoring circuit is below a predetermined level, and for charging the battery at a reduced rate when the said second electrical signal is above a predetermined level.
Claim 15
Independent Claim
92 words
A method of rapidly charging a battery comprising the steps of: a. sensing the internal temperature of the battery and producing therefrom an electrical signal representative of the sensed temperature; b. differentiating the said electrical signal once and thereby creating a new electrical signal representing the rate of change of the previous signal; and c. applying a charging current of a first level to the battery as long as the new electrical signal remains below a predetermined value and reducing the charging current when the new electrical signal exceeds the predetermined value.
Claim 16
Independent Claim
92 words
A method of rapidly charging a battery comprising the steps of: a. sensing the internal temperature of the battery and producing therefrom an electrical signal representative of the sensed temperature; b. differentiating the said electrical signal once and thereby creating a new electrical signal representing the rate of change of the previous signal; and c. applying a charging current of a first level to the battery as long as the new electrical signal remains below a predetermined value and reducing the charging current when the new electrical signal exceeds the predetermined value.
Claim 17
Independent Claim
94 words
A method of rapidly chargIng a battery comprising the steps of: a. sensing the internal temperature of the battery and producing therefrom an electrical signal representative of the sensed temperature; b. monitoring the said electrical signal and converting this signal into a new electrical signal representative of the rate of change of the previous signal; and c. applying a charging current of a first level to the battery as long as the new electrical signal remains below a predetermined value and reducing the charging current when the new electrical signal exceeds the predetermined value.
Claim 18
Independent Claim
94 words
A method of rapidly chargIng a battery comprising the steps of: a. sensing the internal temperature of the battery and producing therefrom an electrical signal representative of the sensed temperature; b. monitoring the said electrical signal and converting this signal into a new electrical signal representative of the rate of change of the previous signal; and c. applying a charging current of a first level to the battery as long as the new electrical signal remains below a predetermined value and reducing the charging current when the new electrical signal exceeds the predetermined value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |