RU2488205C1 - Charging method for electrochemical current source - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: charging method for electrochemical current sources (ECCS) by means of charging pulses supply when voltage is supplied to ECCS from the charger, control is carried out for variations of the first-order derivative of current against time dl/dt and charging current from zero value up to maximum value Imax at which the first-order derivative of current is controlled against time dl/dt is equal to zero; maximum values of current are maintained within a period of time till sign change of the derivative, then value of charging current is decreased till the value equal to 0÷(0.05÷0.1)I_max for the time equal to ≤(0,0015÷0,3)τ, where τ is time for charging current increase from zero till its maximum value. The method can include operations for control of the first-order derivative dU/dt and time period within which dU/dt value becomes constant; charging current is maintained as equal to zero within period of time which is not less than the time period within which the first-order derivative of charging voltage U at ECCS dU/dt becomes equal to zero or changes sign.

EFFECT: improvement of electrical characteristics for electrochemical current sources.

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Description

The invention relates to the field of electrical engineering, and in particular to methods of charging electrochemical current sources (ECT).

A known method of charging ECCP by passing through it a sequence of rectangular pulses with a frequency of 10-2000 Hz with a constant voltage with a gradual decrease in the current amplitude to 20% of the original value (RF patent No. 2218646 C2, class. H02J 7/10, 2003).

The specified method of charge does not provide optimal modes of charge and increase electrical characteristics.

The closest in the set of essential features and the technical result achieved is the method of charging ECCP by supplying charging current pulses (RF patent No. 2216836 C1, class. H02J 7/00, 2003).

The specified method of charging also does not provide optimal charge modes and increase electrical characteristics.

The technical result of the invention is to increase electrical characteristics by providing optimal charge conditions.

The indicated technical result is achieved in that the ECB charge is produced by supplying charging current pulses, while the voltage from the charger is supplied to the ECB, the change in the values of the first derivative of the current with respect to time dI / dt and the charging current from zero to the maximum value of I _max , is controlled at where the first derivative of the current with respect to time dI / dt is zero, the maximum current value is maintained for a time until the sign of the derivative changes, then the value of the charging current is reduced to a value equal to 0 ÷ - (0.05 ÷ 0.1) I _max per _v belt, whose value is ≤ (0.0015 ÷ 0.3) τ, where τ is the time of charging current increase from zero to the maximum value.

The lower time limit of 0.0015τ is determined by the maximum allowable voltage supplied from the charger to the ECC, the upper time limit of 0.3τ is determined by the minimum allowable voltage supplied from the charger to the ECC.

It is advisable to control the value of the first derivative dU / dt and the time during which the value dU / dt is constant, the charging current is maintained equal to zero for a time, the value of which is not less than the time during which the first derivative of the charging voltage U on the ECCP dU / dt assumes a value of zero, or changes sign.

The claimed method of charge provides an effective charge mode of ECCP with minimal internal resistance due to the absence of activation polarization.

The analysis of the prior art showed that the claimed combination of features of the invention is not known. This allows us to conclude that the claimed method meets the condition of "novelty."

To verify the conformity of the claimed invention with the criterion of "inventive step", an additional search was carried out for known technical solutions in order to identify features that match the distinctive features of the claimed technical solution from the prototype. Thus, we can conclude that the claimed technical solution does not follow explicitly from the prior art. Therefore, the claimed invention meets the criterion of "inventive step".

The invention is illustrated by drawings and an example implementation of the method.

Figure 1 presents the installation for the practical implementation of the claimed method of charging the battery.

Figure 2 presents the installation for discharging a battery charged by the claimed method.

Practical example

To implement the inventive method was assembled charging figure 1 and discharge figure 2 installation. The charging installation includes a charger 1, for which a Mastech HY3030E power source was selected (maximum output voltage 30 V, maximum output current 30 A), a device 2 that sets and monitors the parameters at which the claimed charging method and rechargeable ECCH 3 are carried out , which is taken as a lead-acid battery Haze HZB 12-33, voltage 12 V, capacity 33 Ah. The discharge of ECHIT 3 was carried out on an electronic load 4 by Actakom ATN 8301 (load power 0-350 W, load current 0-30 A). Voltages and currents were monitored using a Fluke 187 digital multimeter and a Tektronics TDS 1012B digital oscilloscope.

Previously, the rechargeable battery (AB) was charged in a twenty-hour charge mode to a voltage of 14.5 V without using device 2. Then, in the installation (Fig. 2), the AB was discharged with a current of 1.65 A (current corresponding to 5% of the battery capacity). The capacity obtained by the discharge was 32.8 Ah. After that, the battery was charged on the installation (Fig. 1) to a voltage of 13.4 V. The charging time was 13 hours, the discharge capacity was 36 Ah. For comparison, the battery was recharged in the usual way, without device 2, with a current of 1.65 A to 13.4 V. Then the battery was discharged and the resulting capacity was 23.76 Ah. Thus, it can be seen that at the same final charging voltage, using the claimed method of charging ECCP, the AB can be charged to a larger capacity, which indicates a decrease in the internal resistance of the AB in terms of the polarization, activation components.

Claims (2)

1. The method of charging an electrochemical current source (ECT) by supplying charging current pulses, characterized in that the ECT is supplied with voltage from the charger, control the change in the values of the first derivative of the current with respect to time dI / dt and charging current from zero to a maximum value of I _max , at which the first time derivative of the current with respect to time dI / dt is zero, the maximum current value is maintained for a time until the derivative changes sign, then the value of the charging current is reduced to a value equal to 0 ÷ (0.05 ÷ 0.1) I _max for the time , s the beginning of which is ≤ (0.0015 ÷ 0.3) τ, where τ is the time of increasing the charging current from zero to the maximum value. 2. The method according to claim 1, characterized in that the value of the first derivative dU / dt and the time during which the value of dU / dt is constant are controlled, the charger is kept equal to zero for a time, the value of which is not less than the time during which the first derivative of the charger voltage U on ECC dU / dt takes a value equal to zero, or changes sign.

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