RU1830558C - Method for determination of volt-ampere characteristic of chemical constant-current source - Google Patents

Abstract

Usage: to determine the current-voltage characteristics of a chemical current source (CIT). SUMMARY OF THE INVENTION: To determine the current-voltage characteristic of the CIT, the capacitor load is precharged from the voltage source of reverse polarity, discharge the CIT to the capacitor load, during the discharge, the current-voltage characteristic of the CIT is recorded by supplying signals corresponding to the values of the voltage on the CIT and discharge current to the input of the recording device, for example, to the plates Y and X of the electronic storage oscilloscope. The voltage on the HIT at which the current has a maximum value is determined. If it is not equal to zero, the measurements are repeated, having previously changed the voltage of the source of reverse polarity, until the voltage on the HIT is equal to zero only at the maximum current value. Thereafter, the current-voltage characteristic of the HIT is determined as part of the characteristic in the region of positive values of the voltage on HIT. 2 ill.

Description

The invention relates to electrical engineering, in particular to chemical current sources (CIT), and can be used to determine their current-voltage characteristics.

The aim of the invention is to reduce the complexity and increase the accuracy of measurements.

Fig. 1 is an electrical diagram for determining a current-voltage characteristic of a HIT; in FIG. 2 - dependences of the voltage on the HIT on the discharge current. The circuit contains a HIT (1) connected in parallel with a HIT through a switching element (2) and a current sensor (3), a capacitor (4). a voltage source of reverse polarity (6) connected via a second switching element (5). A voltage sensor (7) connected in parallel to the HIT (1), whose output is connected to the input Y of the electronic storage oscilloscope 8, is connected to the input X of the current sensor 3.

A method for determining the current-voltage characteristic of a CIT is carried out as follows.

Connect the capacitor 4 using the second switching element 5 to a voltage source of reverse polarity 6, which is adjustable, and charge the capacitor 4. After charging the capacitor 4, it is turned off by the second

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switching element 5 from the voltage source of reverse polarity 6 and using switching element 2 connect the HIT 1 to the capacitor 4. In this case, the voltage from the voltage sensors 7 and current 3, respectively, is proportional to the voltage on the HIT and the discharge current to the inputs X and Y of the electronic storage oscilloscope 8, on the screen of which the dependence (1) shown in Fig. 2 is recorded. Then, the voltage value for the HIT at which the dependence (1) has a maximum is determined. If the voltage on the CIT has a positive value (curve ode) or negative (curve atp), then repeat the measurements, respectively, having previously increased or decreased the voltage of the source of reverse polarity 6, until then, the voltage on the CIT will be zero only at maximum dependence 1M (1) (curve abc) and determine the current-voltage characteristic of the CIT in the region of positive values of the voltage on the CIT (section ab of the curve abc).

The capacitance load capacitance is chosen so that the duration of the recharging of the capacitors corresponds to the resonant frequency at which the internal resistance of the battery is determined only by the ohmic component.

The connecting wires, busbars and switching element are selected so that their resistance is less than the internal resistance of the battery.

The method for determining the current-voltage characteristics of HIT allows you to:

to increase the accuracy of determining the current-voltage characteristic of CI due to the possibility of determining part of the current-voltage characteristic at values of bit currents close to or equal to the short circuit current;

significantly reduce labor intensity

works on determination of current-voltage characteristics especially at low temperatures, due to the possibility of determining the characteristics without recharge of CI;

to provide a possibility of comparing the current-voltage characteristics of CIT obtained by various studies.

Claims (1)

The claims A method for determining the current-voltage characteristics of a chemical current source (CIT) by measuring the voltages of the CIT and the corresponding discharge currents, such as in order to increase accuracy of measurements and reduction of labor input, the CIT discharge is carried out on a capacitor load, which is precharged from an additional source of polarity inverse to the CIT, and in the course of the CIT discharge, the dependence (1) is recorded by supplying signals correspondingly proportional to the value of the voltage on the CIT and the discharge current to the input of the recording device, the voltage on the CIT is determined at which the dependence LM (1) has a maximum and, if it is not equal to zero, the measurements are repeated, having previously changed the voltage of the source of reverse polarity, until the voltage on the HIT is equal to zero only at the maximum of dependence (1); after which the current-voltage characteristic of the HIT is determined as part of the dependence (1) in the region of positive values of the voltage of the HIT. - ± - FIG. 1 Her entrance L Fig 2