RU174763U1 - Device for determining the actual battery capacity - Google Patents

Abstract

The utility model relates to the field of measurement technology and can be used to determine the capacity of rechargeable batteries, mainly sealed lead-acid, used in various technical devices and systems. The technical result consists in increasing the level of automation for determining the capacity of batteries in various operating conditions. A device for determining the actual capacity of rechargeable batteries contains a digital low-frequency generator, a meter consisting of a compensating device, a voltage-code converter, a result register and a reference power source, a thermocouple, an additional voltage-code converter, a result register. The result register stores a table of correspondence of the code value of reactance to the actual value of the residual capacity of the battery, a table of correspondence of code values with correction factors for different temperatures, and the product of the resulting code value of reactance and the code value of the correction temperature coefficient corresponding to a certain temperature is calculated. 1 ill.

Description

The utility model relates to the field of measurement technology and can be used to determine the capacity of rechargeable batteries, mainly sealed lead-acid, used in various technical devices and systems.

The main indicator of battery health is capacity. A known method for its determination by charge-discharge, however, this method is time-consuming and does not allow for operational diagnostics. From the point of view of diagnosing batteries, internal resistance is of much greater interest, by the value of which it is possible to determine the capacity of rechargeable batteries quite accurately with minimum costs.

A patent search for the relevant classes (IPC G01R31 / 00, H01M 10/48) showed that the closest in technical essence to the claimed utility model is the "Device for determining the energy of batteries" (RF patent No. 2279162 from 01/13/2005) [1] which is taken as a prototype.

, соответствующий нулевому значению эталонного тока

, например при положительной полуволне напряжения

, протекающего через батарею, производится измерение величины

при помощи преобразователя напряжение – код последовательного счета со ступенчато растущим напряжением обратной связи, работающего в одностороннем неследящем режиме. Исключение неточности компенсации, вносимой компенсирующим устройством, осуществляется путем вычитания с учетом своего знака из результата измерения

, полученного в момент времени

результата аналогичного измерения

для момента времени

, но уже при противоположной полярности измеряемого напряжения. Измеряемая величина пропорциональна показаниям регистра результата, выражена в долях от протекающего через батарею тока и соответствует кодовому значению реактивного сопротивления, соответствующего фактической емкости батареи. Таблица соответствия кодового значения реактивного сопротивления фактической емкости батареи содержится в памяти регистра результата. The device includes a digital generator of infra-low frequency, a compensating device, a voltage-to-code converter, a result register, and a reference voltage source. The operation of the device is synchronized by pulses from a digital generator of infralow frequency. The device measures the reactance of the battery, for which at time

corresponding to the zero value of the reference current

for example, with a positive half-wave voltage

flowing through the battery, a measurement is made of

with the help of a voltage converter, a serial counting code with a stepwise increasing feedback voltage operating in one-sided non-tracking mode. The exclusion of inaccuracy of compensation made by the compensating device is carried out by subtracting, taking into account its sign, from the measurement result

received at time

similar measurement result

for a point in time

, but with the opposite polarity of the measured voltage. The measured value is proportional to the readings of the result register, expressed in fractions of the current flowing through the battery and corresponds to the code value of the reactance corresponding to the actual battery capacity. The correspondence code table of the reactance of the actual battery capacity is contained in the memory of the result register.

=(25±2)°С при помощи соответствующих поправочных температурных коэффициентов [2, 3]. Механические измерения температуры увеличивают время измерений и снижают уровень автоматизации процесса в целом. К тому же при конечных расчетах обслуживающим персоналом могут быть внесены непроизвольные ошибки, обусловленные человеческим фактором.The main disadvantage of the device is its limited use, due to stationary conditions, due to the lack of built-in means of measuring the temperature of the battery. It is known that battery capacity is significantly dependent on ambient temperature. For its reliable assessment, it is necessary to measure the temperature of the battery and bring its capacity to

= (25 ± 2) ° С using the corresponding correction temperature coefficients [2, 3]. Mechanical temperature measurements increase the measurement time and reduce the level of automation of the process as a whole. In addition, in the final calculations, maintenance personnel can make involuntary errors due to the human factor.

The technical result of the proposed utility model is aimed at increasing the level of automation in determining the capacity of batteries in various operating conditions.

The technical result is achieved by the fact that the proposed utility model “A device for determining the actual capacity of rechargeable batteries” containing a digital low-frequency generator, a meter consisting of a compensating device, a voltage converter - code, a result register and a reference power source, a thermocouple, for example, chromel type a kopel built into the clamp of the device, designed to connect to the negative terminal of the battery, an additional voltage converter - code, to the input of which a thermocouple is connected, and the output is connected to an additional code input of the result register, where in addition to the table of correspondence of the code value of the reactance to the actual value of the residual capacity of the battery, there is a table of correspondence of code values to the correction factors for different temperatures, and the product of the code value of reactance is multiplied by the code value of the correction temperature coefficient corresponding to a specific temperature.

Distinctive features of the proposed device is the presence of a thermocouple, for example, a chromel-copel type, built into the device’s clamp, designed to connect to the negative terminal of the battery, the presence of a second voltage converter is a code designed to convert the voltage from the thermocouple into a code value and an additional code an input at the results register, in the memory of which, in addition to the correspondence table of the reactive resistance code value to the actual value exact capacity of the battery, contains a table of correspondence of the code values of the correction coefficients at different temperatures, and the product obtained is carried out code reactance value at code value temperature correction coefficient corresponding to a certain temperature. Structural electrical diagram of the proposed device is shown in the figure and includes:

diagnosed battery 1;

digital low-frequency generator 2;

compensating device 3;

voltage converter - code 4;

result register 5;

reference power supply 6;

thermocouple 7;

the second voltage converter is code 8.

The principle of measuring the reactance of the proposed device is similar to the prototype. The meter includes a compensating device 3, a voltage transducer - code 4, a result register 5, a reference power source 6. At the time of reactance measurement, the thermoelectromotive force arising in the thermocouple 7 is built into the clamp designed to connect to the negative terminal of the battery 1 , the voltage - code 8 is converted using the second converter into a code value and is supplied to the additional code input of result register 5. In the result register 5, multiplied e code value of temperature on a code value of reactance. The code values thus obtained, which are stored in the memory of result register 5, will correspond to the actual capacities of the batteries, but already taking into account the correction temperature coefficients.

INFORMATION SOURCES

1. Pat. 2279162 Russian Federation, IPC H01M10 / 48, G01R31 / 36 Device for determining the energy of batteries [Text] / Krylov S.K., Kapelko K.V., Bulanov R.N., Berdnikov A.Yu., Podunov D.V. , Suchkov V.P., applicant and patent holder Military. Acad. Strategic Rocket Forces named after Peter the Great. - No. 2005100370/09, declared 01/13/2005; publ. 06/27/2006 Bull. Number 18. - 5 sec. : ill.

2. GOST R 53165-2008. Rechargeable lead starter batteries for automotive vehicles. General specifications. - enter 2008-12-18. - M .: Standartinform, 2009 .-- 33 p.

3. GOST R IEC 60896-21-2013. Stationary lead acid batteries. Part 21. Types with control valve. Test methods. - enter 2013-11-22. - M .: Standartinform, 2014 .-- 35 p.

Claims (1)

A device for determining the actual capacity of batteries containing a digital generator of infralow frequency, a meter consisting of a compensating device, a voltage-to-code converter, a result register and a reference power source, characterized in that it additionally has a thermocouple, for example, a chromel-copel type, built-in into the clamp of the device, designed to connect to the negative terminal of the battery, an additional voltage converter is the code to the input of which is connected a thermocouple, and the output is connected to an additional code input of the result register, where in addition to the table of correspondence of the code value of the reactance to the actual value of the residual capacity of the battery, there is a table of correspondence of the code values to the correction factors for different temperatures and the product of the received code value of the reactance by the code value of the correction temperature coefficient is corresponding to a certain temperature.

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