KR100914388B1 - Battery internal parameter sequential measuring methord and it's measuring device - Google Patents

Abstract

The present invention provides a battery diagnostic apparatus that enables on-line measurement of important parameters such as internal impedance of a battery while operating in a constant operating state without disconnecting dozens of series-connected battery systems used in emergency power equipment or communication network power equipment. In this case, it is determined at each measurement step whether the relay means which is a part of the component is broken to prevent the relay means from being damaged additionally or continuously.

The relay means increases in number depending on the number of batteries to be measured and serves to connect (switch) the batteries under measurement to the measuring means or the measuring module, and to generate a signal for turning on a predetermined relay means. After determining whether there is a failure of all the relay means immediately before, if it is not a failure, the ON control signal is generated so that the relay means is connected, and the characteristics of the battery cell are connected through the relay means connected according to the selection control signal. Measure and turn off the selection control signal so that the relay means is turned off, and then again determine the failure of each relay means during the dead time when all relay means are turned off, and if a fault is found, the next relay immediately The method of stopping the procedure of turning on the means to prevent the continuous breaking of the relay means at each step of the measurement of each battery cell. To suggest.

Storage cell, String block, Relay means, Measuring module, Measuring means

Description

Sequential measurement method of internal battery parameters and measuring device thereof {BATTERY INTERNAL PARAMETER SEQUENTIAL MEASURING METHORD AND IT'S MEASURING DEVICE}

1 is a functional connection diagram of a typical battery measurement diagnostic device

Figure 2 is a connection diagram of the measuring means and the relay means in the general case

FIG. 3 is a time diagram of a selection control signal indicative of the time for each relay means to be turned off.

4 is an output waveform of a differential amplifier circuit connected to a terminal of a battery cell in the present invention;

5 is a flowchart for implementing a relay means failure prevention method according to an embodiment of the present invention as an internal program.

6 is a flowchart showing a relay means failure prevention method according to an embodiment of the present invention.

In order to determine the deterioration degree of the measured object whose internal impedance increases with the aging degree, such as the battery, after discharging the battery under test or injecting the measurement signal, the internal impedance voltage drop component of the measured signal flowing through the battery under test (hereinafter, The method of calculating the internal impedance or conductance by measuring the impedance voltage) and diagnosing the state of health of the battery on-line is common.

Companies providing wired and wireless communication services have hundreds of battery facilities in the relay station as primary power sources for communication network power, and more than 200 cells are used in series for battery cells used in data processing computer centers or DCS systems for factory automation. It is connected and operated in the state of floating charge in preparation for constant power failure.

In order to diagnose the health condition of a battery system operating in a floating charge state as described above, a basic diagnostic unit having the necessary number of relay means to measure the characteristics of the battery cell in units of 4, 24, or 64 cells is required. Installed in the vicinity of the tank and measuring the characteristic data such as internal impedance or resistance component of the battery cell, cell voltage (V _DC ), and cell temperature (T) in the diagnostic unit and converting the digital characteristic data signals into RS485 signals. PC monitor connected to the central monitoring device by sending the collected data to the central monitoring device through a serial communication line, such as a liquid crystal display device connected to the central monitoring device, a thermal printer, or a PC monitor connected to the central monitoring device. As a result, a diagnostic apparatus system capable of monitoring and analyzing the characteristic data of each battery cell has been commercialized.

As another example, a measuring module for measuring characteristic data of a battery in units of 4 to 8 cells is attached to each of 4 to 8 cells of battery tanks (strings), and the data collecting device and each measuring module are connected to an RS485 serial communication method or an optical path. The loop is connected. The characteristic data of each battery measured by the plurality of measurement modules and converted into digital signals is collected and stored in a data collecting device through an optical line or an RS485 serial communication line.

In addition, in the patent filed by the present applicant on April 23, 2003, in the Republic of Korea (Application No. 10-2003-0025823), when there are more than hundreds of battery tanks, a number of relaying units or relays By placing the device close to each other in a plurality of battery tanks (strings) and connecting them to each other in a series arrangement with each other, you can monitor hundreds of battery cells with each other so that you can monitor hundreds of battery cells. It is proposed to switch easily.

1 or 2 generally shows how the battery diagnostic system is connected to each function. When the battery system under test consists of a plurality of cells (24 communication powers and about 60 UPS or control powers), the diagnostic unit or measurement (diagnosis) module, which is a basic unit of the diagnostic system, is usually measured. A relaying unit for scanning impedance voltage signals, current signals and temperature signals from the battery cells, and a function of calculating an internal impedance or conductance value of the battery cells by converting the input signals into digital values. And measuring means (2), the measuring module (2) is a measuring signal generating means (6, current / voltage generating circuit for generating a measuring current signal or flowing a discharge current required for measurement in a battery cell under measurement). It can consist of).

As is known, the relaying unit is composed of a group of predetermined relay means, and the measuring means is composed of an input side amplifier circuit, an A / D converter, a main processor unit (MPU), and the like.

In addition, through each relay means the input circuit of the measuring means is connected to each cell of the battery string (floating charge), and through the other relay means (#a, #b, ... ~ #m) The battery cell to be measured is connected to the output terminal of the measurement signal generating means for each string block.

When the select control signal (Select) is applied from the MCU to the corresponding relay means connected to the battery cell to be measured, the selected relay means of each relay means is turned on and is measured between the battery and the measurement signal generating means. A current or discharge current signal flows through the relay means. Therefore, measurement data such as voltage (V), temperature (t), and impedance voltage of the battery can be input to the input circuit of the measuring means through the measurement cable, and the characteristic data of the battery cell is turned on by the built-in calculation program of the MCU. Can be computed as a line.

In order to measure the internal impedance or conductance, temperature, terminal voltage, etc. of the battery as above, the input circuit of the measuring means is sequentially connected to each cell of the battery string through each relay means. In the selection control phase of the relay means If any one of the relay means is attached or adhered to its circuit connection means (e.g., a mechanical structure by contact) due to a failure, the input side of the measurement means via the circuit connection means It is connected to the battery terminal.

In this state, when another relay means is additionally turned on, the battery terminal voltage is short-circuited through the circuit connecting means of the failed relay means and the circuit connecting means of the new relay means. Short circuit current flows from the battery through the circuit connection means of the relay means. Therefore, due to the short-circuit current, the circuit connecting means and related circuits are damaged. In this case, when another relay means is additionally turned on (ON), the related circuits such as the circuit connecting means are additionally damaged and are continuously damaged. It will be.

According to the present invention, if it is determined that there is a failure of all the relay means immediately before generating a signal for turning on the relay means in the measurement step, and if there are no abnormalities or failures, the selective control is connected such that the relay means of the first measurement sequence is connected. Generates a signal, measures the characteristics of the corresponding battery cell through the relay means connected according to the selection control signal, turns off the selection control signal so that the connected relay means is OFF, and turns on the next relay means ( By detecting the failure of each relay means before generating a signal for ON), it is possible to detect the abnormality of the relay means at an early stage and further prevent them from being damaged continuously.

In addition, when it is determined that the relay means failure, the failure state is collected in the data collecting device and the collected data is sent to the central monitoring device as a liquid crystal display device connected to the central monitoring device or a PC monitor connected to the central monitoring device. The failure status of all relay means is displayed.

 The present invention provides a method for measuring internal battery parameters, which enables to sequentially measure important parameters such as a plurality of internal battery impedances.

Determining whether there is a failure of all the relay means before generating a signal for turning on the relay means corresponding to the measurement sequence (object) (S201);

Outputting an ON signal such that the corresponding relay means is connected to the measuring means only when there is no failure of the relay means (S202);

Measuring characteristics of the battery cell through the connected relay means (S203);

Turning off the selection control signal such that the connected relay means is turned off (S204), and determining whether there is a failure of the relay means before generating a signal for turning on the relay means of the next measurement sequence (S205). do.

       In addition, the method may further include a step (S208) of switching the measurement signal necessary for measuring the internal impedance or conductance to the capacitor under measurement in the step of measuring the characteristic of the battery cell through another relay means.

In addition, the method may further include a step (S207) of notifying the external display means of the recognized failure state.

In addition, the present invention is to determine the failure of the relay means for connecting the input circuit of the measuring means to each battery cell in order to measure the internal impedance / conductance, temperature, terminal voltage, etc. of the battery on-line,

Sampling the voltage waveform of the battery cell output terminal;

Obtaining an average value or an rms value of the voltage waveform;

And comparing the average value or the effective value with a predetermined reference value to recognize an abnormal state.

The above objects, features, and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be.

FIG. 1 is a block diagram of a battery aging diagnosis device in which a general concept of sequentially measuring important parameters such as internal impedances of a plurality of batteries is introduced, and FIG. 2 is a diagram illustrating each relay means and measurement means in a battery aging diagnosis device. FIG. 3 is a time diagram of a selection control signal indicating an on-off time of each relay means, and FIG. 4 is an input terminal circuit connected to a battery terminal output according to the present invention. Output waveform of the differential amplifier circuit 5 is configured to, Figure 5 shows a flow chart of the internal program for implementing the relay means failure prevention method of an embodiment of the present invention, Figure 6 is a storage battery which is an embodiment of the present invention A flowchart showing a method of preventing relay means failure in measuring internal parameters is displayed.

In general, as shown in FIG. 2, the battery measuring diagnostic apparatus or the measuring module includes a relay for switching the measuring means 2 for measuring battery cell characteristics and the terminal output of the batteries under test, to be sequentially connected to the measuring means 2. And a switching control means (3) for generating a selection control signal to a plurality of relay means which are components of the relaying unit (1) by the in-unit (1) and the MPU (4). ) Has a number of relay means.

The measurement signal generating means 6 controls the measurement current signal necessary for the internal impedance measurement to flow to the battery under measurement or the string block of the battery under measurement, and the switching control means 3 transmits the measurement current signal to the relay means #a, #. Select control via b ~ # m to connect to the battery cell or string block under test.

As the measured current signal flows through the battery under test or its string block, the battery cell under test generates an internal impedance voltage, and at the same time, relay means # 1, # 2, ... ~ # connected to the battery cell to be measured. n Select ON to complete the characteristic data (parameter) measurement of the battery cell. Thereafter, the operation of the measurement current signal is stopped and the corresponding relay means is turned off, and then the relay means is turned on so that the measurement current signal flows in the battery string block corresponding to the next measurement sequence (target).

In this way, each relay means is provided in each battery cell constituting the battery string block to be measured, through which the measurement current signal flows in order to measure the impedance voltage signal of the corresponding battery cell and characteristic parameter signals such as current signal and temperature (t). As shown in FIG. 3, all the relay means can be turned off before the next relay means is turned on so as to be sequentially connected, and to ensure stable operation of each relay means. It is controlled to have a dead time.

Each of the relay means selects a battery cell to be measured from among a plurality of battery cells by a select control signal generated by the MPU 4 by the switching control means 3, wherein the measurement current signal is also The relay means #a, #b ... to #m are supplied to the string block of the battery cell under test, which is selected for internal impedance measurement.

In this measuring process, even if the ON selection control signal of the relay means is not generated, the relay means # 1, # 2 due to the failure of the measurement signal generating means 6 or any relay means, etc. If the circuit connection means of any relay means of ..., ... ~ #n is connected or any circuit connection means of relay means #a, #b ... ~ #m is connected to the battery terminal output, When the selected relay means is turned on, the closed loop is formed along the string of the battery system through the circuit connection means of the connected relay means, so that the battery output is short-circuited and the shorted closed loop circuit is larger than the allowable size. Since a current (short circuit current) flows, a failure occurs in which a part of the circuit in which the circuit connecting means is fused or closed loop burns out due to the short circuit current.

The present invention provides a battery cell to be measured in each relay means (# 1, # 2, .. ~ # n or #a, #b, ... ~ #m) in order to prevent the failure as described above Only when it is judged that there is no abnormality (S201) after judging whether there is a failure of all relay means and its circuit connection means during the dead time immediately before the generation of the selection control signal for turning on the relay means to be connected. In operation S202, an ON selection control signal is generated such that the predetermined relay means is connected. After that, the characteristics of the corresponding battery cell are measured through the connected relay means (S203), and the selected control signal is turned off (S204) so that the connected relay means is turned off (OFF), and the next relay means is turned on (ON). In the dead time before generating a signal for determining the failure of each relay means again (S205), and if a failure is found, immediately stops the procedure of turning on the next relay means (step). Stopping the operation (S206) to prevent further damage of the relay means.

As described above, if a failure error occurs in any of the relay means or circuit connection means, it is detected and judges whether there is an abnormality. The error flag may be set and transmitted to the data collecting device or the server (S207).

Hereinafter, a method of confirming whether all relay means are normal or abnormal before the selection control signal of each relay means is applied will be described in more detail.

Fig. 4 shows an embodiment of the output terminal waveform of the differential amplifier circuit 5 formed at the input circuit terminal of the measuring means of the present invention. In step S201 or S205, determining whether all relay means are normal or abnormal during the period in which all relay means are off. If all of the relay means is normal, since the input side of the differential amplifier circuit 5 is open and not connected to the battery output terminal, the waveform of the output terminal of the differential amplifier circuit 5 of the measuring means 2 is different from the left waveform of FIG. Similarly, it is measured by a direct current (DC) voltage (0 V when there is no offset voltage of the differential amplifier circuit 5), which is a predetermined offset voltage level.
In addition, if the relay means is connected to any one of the circuit connection means of the relay means due to failure or abnormality or is fused due to burnout, The output terminal voltage waveform of the differential amplifier circuit 5 during the dead time when all the relay means is turned off, the battery output terminal is connected to the differential amplifier circuit 5 through a circuit connection means that is stuck or fused due to a failure. Is connected to the inverting or non-inverting input of As shown in the waveform on the right side of FIG. 4, it is the same as the AC pulse wave voltage waveform oscillating with an arbitrary frequency.

Therefore, the output terminal waveform of the differential amplifier circuit 5 is measured at the dead time at which all the relay means is turned off before generating a signal for turning on the relay means of the next measurement sequence. If the effective value is obtained and this result value is obtained above a predetermined value, it is possible to determine that any one of the relay means has an abnormality or a failure.

Based on the above technical theory, the signal obtained by measuring the waveform of the output terminal of the differential amplifier circuit 5, which is the input circuit of the measuring means 2, using the hardware circuit composed of a known operational amplifier or a comparison circuit, its average value and effective value Can be obtained, but in reality, its configuration circuit becomes complicated.

As in the embodiment of the present invention, the average value and / or the effective value thereof may be calculated by performing a calculation program embedded in the MPU 4 of the measurement module, and the amount of the relay means may be abnormal or faulty by analyzing its size. Awareness can be determined.

5 is a flowchart of an internal program for implementing a relay means failure prevention method according to an embodiment of the present invention.

When the measurement starts, the operation loop enters the operation loop for checking whether there is an abnormality in the relay means or the circuit connection means, and sets the counter n to 0 (S101).

In order to measure the waveform of the output terminal of the differential amplifier circuit, the voltage signal for one period of the waveform is input to the A / D converter, converted into a digital signal, and stored repeatedly until N times (S102).

The average value is first calculated from the stored voltage waveform, and then the rms value is calculated. In order to simplify the calculation, it is possible to determine whether the relay means is faulty by calculating only one of the average value or the effective value of the stored voltage waveform according to the designer's decision, but according to the fault condition of the relay means or the circuit connection means thereof. Since the level or state of the voltage waveform of the differential amplifier circuit may be different, it is necessary to consider this.

If any one of the average value and the RMS value exceeds the predetermined set value M1, M2, the operation of the measurement module is stopped and the corresponding event bit is set (S103).

The bit is transmitted to the data collection device or the server to indicate the status of the relay means abnormality or failure. In addition, if the average value or the effective value exceeds a predetermined reference set value M1 or M2 according to the designer's judgment, it may be determined that the relay means is abnormal and the operation of the measuring module may be stopped. It may also be necessary to take this into account as the level or state of the waveform may vary.

If the average value and the effective value do not exceed predetermined reference set values M1 and M2, the corresponding relay means is operated to select the battery cell to be measured, and then the measurement step is continued.

If an abnormality is found in the above, the operation of the measuring module is stopped immediately so that the next relay means cannot be turned on, and an error flag is set and transmitted to the data collecting device or the server (S105).

If the failure of the relay means is corrected, it is possible to reset the bit of the relay means and start the measurement step again.

As described above, in order to measure internal parameters such as internal impedance or conductance, temperature, terminal voltage, and the like online, the input circuit of the measuring means is sequentially connected to each cell of the battery string through each relay means. In the selection control phase of each relay means If any one of the relay means is attached or adhered to its circuit connection means (usually a contact in the case of mechanical structure) due to failure or burnout, it can immediately detect it and stop the operation of the measuring module. By preventing the relay means from being additionally turned on in the case of detecting a state, it is possible to prevent the related circuit such as the circuit connection means from being burned out and the relay means additionally or even continuously broken.

Claims (5)

In the method of sequentially measuring important parameters such as the internal impedance of a plurality of batteries, (a) measuring and analyzing the output voltage waveform of the measuring means during a dead time before generating a signal for turning on the relay means to determine whether all the relay means have failed; (b) switching (connecting) the relay means of the measurement sequence only when it is determined that there is no failure of all the relay means; (c) connecting the storage battery to be measured to the measurement means through the switched relay means and measuring the parameters of the storage battery; And (d) determining whether there is an abnormality in all relay means after controlling the connected relay means to be OFF and before turning on the next relay means; Sequential measurement method of a battery internal parameter comprising a. delete The method according to claim 1, Before or after performing step (b), And switching the measured current signal necessary for the measurement to flow through the other relay means to the battery under measurement. The method according to claim 1 or 3, In the step (a), determining the failure of the relay means, Converting the output waveform of the battery under test into a digital signal for one period and storing the waveform until N times; Calculating an average value and / or an effective value from the stored voltage waveform; And Determining whether at least one of an average value or an effective value of the calculation result exceeds a predetermined set value; Sequential measurement method of a battery internal parameter comprising a. delete

Images