Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1989-04-17
1991-09-10
Wieder, Kenneth A.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
324434, 324436, G01N 2726
Patent
active
050477226
ABSTRACT:
Apparatus for measuring the total internal resistance of a multicell battery having positive and negative terminals employs a first transistor device having an input and an output and having mutually exclusive conductive and non-conductive electric states. An arrangement of resistances is connected in series with the device to form a network. The network is connected between the positive and negative terminals. An operational amplifier has an output connected to the input of the device and first and second inputs. The first input is connected to the network at a point connected to both of the device and the arrangement. A square wave signal alternating between a positive voltage and ground on alternate half cycles is applied to the second input. The device is in the conductive state when the alternating voltage is positive and is in the non-conductive state when the alternating voltage is at ground. The network conducts no current when the device is in the non-conductive state and conducts a current of constant value when the device is in the conductive state. The voltage appearing between the terminals as a result of the current in the network is monotonically related to the internal resistance of the battery.
REFERENCES:
patent: 3676770 (1972-07-01), Sharaf et al.
patent: 4204162 (1980-05-01), Froidevaux
patent: 4361809 (1982-11-01), Bil et al.
patent: 4719428 (1988-01-01), Liebermann
patent: 4816768 (1989-03-01), Champlin
Dob Allan M.
Garron Stephen A.
Wurst John W.
Jay Theodore
Mueller Robert W.
SSMC Inc.
Wieder Kenneth A.
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