JP2010112771A - System for performing charge/discharge test of electricity storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain accurate measurement data in a charge/discharge test performed over a long time, and moreover, to obtain accurate detailed data of a transient region in switching between modes of charge, discharge, and suspension by simplifying the system configuration. <P>SOLUTION: A control CPU 31 performs high-speed sampling of charge/discharge current and voltage detection signals and converts them into pieces of digital data by an AD converter and obtains these pieces of digital data for only a preset fixed period, in the vicinity of a transient region. In parallel with the acquisition, by having the CPU obtain digital data, while performing its thinning with respect to digital data ranging over a long time; associate these pieces of digital data with each other, by adding the same timing information to the pieces of data, respectively; and transmits the data to a computer 100 side via the Ethernet(R) at a high speed. Based on the timing information added to the transmitted digital data, the computer obtains the pieces of digital data that are associated with one another. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a charge / discharge test system for a power storage device such as a storage battery or a capacitor, and more particularly to measurement data acquisition control in a charge / discharge test.

  This type of charge / discharge test system is a charge / discharge device that can control the charge / discharge current and voltage for personal computers (computers) equipped with application software for charge / discharge control and power storage devices such as storage batteries, power capacitors and electric double layer capacitors. The test condition setting and the output control of the charging / discharging device are performed from the application software (see, for example, Patent Document 1).

  In charge mode and discharge mode, constant current charge / discharge control for charging / discharging the test power storage device with constant current, constant power charge / discharge control for charging / discharging with constant power, constant voltage charge / discharge control for charging / discharging with constant voltage There is a constant resistance charge / discharge control that charges and discharges with a constant resistance, and these control modes can be switched during the test.

  FIG. 5 shows a conventional system configuration. The personal computer (computer) 100 includes the charge / discharge control application software 10 and the data acquisition application software 20, the charge / discharge device 200 includes the charge / discharge power supply 30 and the high-speed sampling device 40, and a storage battery 300 as a test power storage device. Charge / discharge control and measurement data acquisition at this time.

  Communication between the application software 10 of the personal computer 100 and the charging / discharging power supply 30 of the charging / discharging device 200 is necessary for a test obtained from the condition setting sequence device 11 of the application software 10 by bus connection with GPIB (General Purpose Interface Bus). The test conditions are transmitted to the charge / discharge power source 30 through the measurement control unit 12. The test conditions usually consist of a plurality of modes, and each mode is one of charging, discharging, and resting modes. The charge / discharge power supply 30 performs charge / discharge control in which the storage battery 300 is repeatedly charged, discharged, paused, etc., according to a command sent through GPIB.

  The charging / discharging power supply 30 acquires test conditions and charging / discharging control data by the control CPU 31, converts the charging / discharging control data into an analog signal by a DA converter and outputs the analog signal to the analog electronic circuit 32, and the analog electronic circuit 32 performs charge / discharge control. The signal is amplified to apply a charge / discharge current or voltage to the storage battery 300. Further, the charge / discharge current and voltage at this time are transferred to the high-speed sampling device 40 side together with the mode signal. The high-speed sampling device 40 acquires the charging / discharging current and charging / discharging voltage of the storage battery 300 by sampling and AD conversion by the data processing CPU 41, and transfers these data to the personal computer 100 side together with time information as measurement data.

  The data acquisition application software 20 acquires measurement data sent from the sampling device 40 using a USB (Universal Serial Bus). The measurement data is stored in the data file 13 together with the measurement conditions in the application software 10, and the measurement data is displayed to the user by, for example, drawing a graph with the graph display unit 14 or displaying the dump data with the data dump unit 15. As offered.

  With such a device configuration, various information on charging / discharging of a battery or the like can be obtained on the personal computer 100 side, and as one of them, capturing a sudden change in voltage that occurs at the change of mode is the battery. This is useful when estimating the internal resistance of FIG. 6 shows a graph display example of charge / discharge current and voltage when charging and discharging modes are repeated. When the current value is negative, charging is performed, and when the current value is positive, discharging is performed. When this mode is switched, a rapid change in voltage occurs.

At present, in order to measure this rapid change in voltage, as shown in FIG. 5, a high-speed sampling device 40 is mounted on the charge / discharge device 200, and the analog voltage, current, charge, discharge, A pause mode signal is introduced into the high-speed sampling device 40, high-speed AD conversion is performed internally, a timing signal is added, and it is sent as measurement data to the personal computer through the USB. In the personal computer, the data acquisition application software 20 acquires the data, stores the data in the file 13, and stores the filed data in a general-purpose spreadsheet software such as Excel (registered trademark) and displays the graph on the graph display unit 14. It is possible.
Japanese Patent Laid-Open No. 06-215801

  Since the charge / discharge test system shown in FIG. 5 uses a GPIB communication method with a low transfer rate between the personal computer 100 and the charge / discharge device 200, data cannot be stored at a fine measurement interval such as 10 milliseconds. . For this reason, a high-speed sampling device 40 is installed as an external device. An analog voltage signal, current signal, and mode signal are supplied from the charging / discharging device 200, a transient phenomenon at the mode change is sampled by the high-speed sampling device 40, and serial data is transferred to the personal computer side by USB. That is, the application software 10 on the personal computer 100 and the application software of the control CPU 31 on the charging / discharging device 200 are different applications, and these individually manage data. The problems with this configuration are as follows.

  (1) Since the AD converter that performs digital conversion is a separate element for the charge / discharge power supply 30 and the high-speed sampling device 40, the difference in conversion performance between the two AD converters increases the error in the measurement data.

  (2) Since the CPU board and the like are duplicated for the charge / discharge power supply 30 and the high-speed sampling device 40, the entire system becomes large and the cost increases.

  (3) Since the personal computer 100 and the charging / discharging device 200 are connected by two communication cables GPIB and USB, wiring processing and the like become complicated.

  (4) Since the charge / discharge power supply and the high-speed sampling device are separated from each other, transient data cannot be acquired by designating a specific mode switching point. Since it is possible to specify only a mode in which transient data is desired to be acquired, for example, when mode specification is set to discharge, transient data is acquired in all discharge modes, and unnecessary data is also acquired.

  (5) Since the charge / discharge power supply 30 and the high-speed sampling device 40 handle data in different applications, the relationship between the two data is poor and it is difficult to handle them on the same graph.

  In order to solve the above problems (1) to (5), a high-speed AD converter is built in the charge / discharge power supply 30 and a high-speed communication line such as Ethernet (registered trademark) is used, so that data is always high-speed. A method of sampling and storing data on the personal computer 100 side can be considered. However, the charge / discharge test system requires acquisition of measurement data from long-time charge / discharge tests and measurement data of transient phenomena that occur when switching between charge / discharge, etc. In some cases, the difference in measurement time is often 100 times or more, and the number of measurement data points may increase unnecessarily, or conversely, the number of measurement data points may be insufficient. This situation will be explained in a little more detail.

  A single charge or discharge may take a long time, and if the sampling interval is small, the number of data points increases and the file size increases, so consider the measurement time, the nature of the measurement data, and the file size. Determine the sampling interval. For example, if the measurement for 10 hours is performed at a sampling interval of 1 second, the number of data points is 36000, but if the measurement is such that the voltage change of the test battery is only small within 10 seconds, the sampling interval is set to 10 By setting the second, the number of data points can be reduced to 3600 points.

  As described above, in the charging / discharging device, it is generally performed that the sampling interval is rough and the measurement is performed for a long time, but there is also a demand for capturing the transient phenomenon in a short time. For example, after charging with a constant current, if the current setting is set to 0 [A], the voltage changes rapidly. There is a demand for capturing such a rapid change at a sampling interval of 10 milliseconds. In order to satisfy this, if all the measurements as in the above example are performed at a sampling interval of 10 milliseconds, a huge amount of data of 3600000 points is obtained, and a file that is difficult to handle is completed.

  In order to reduce the number of data points, a method of sampling finely in places where there is a sudden change and performing rough sampling in other places can be considered. However, in this method, as described below, a situation that conflicts with other requirements associated with the charge / discharge test occurs.

  As described above, even when the voltage of the test battery changes only slightly in a short time (for example, 10 seconds), the data appears to vary when disturbance noise enters the measurement voltage signal. Sometimes. Since this is not information that the test battery originally produces, it is desirable to remove such unnecessary noise components using a low-pass filter. However, if such a filter that reduces noise is applied, important information that is desired to be captured cannot be accurately captured where there is a sudden change.

  The purpose of the present invention is to simplify the system configuration, accurately acquire measurement data in a long-time charge / discharge test, and accurately acquire detailed data in the transient region when switching between charge, discharge, and pause modes. An object of the present invention is to provide a charge / discharge test system for a power storage device.

  In order to solve the above problems, the present invention is characterized by the following system.

(1) A computer capable of generating test condition setting and charge / discharge control signals for charging, discharging, and resting modes of the test power storage device, and the test power storage device according to the test conditions and charge / discharge control signal transmitted from the computer A charge / discharge device for controlling charge / discharge current / power / resistance and charge / discharge voltage,
The charge / discharge device converts charge / discharge current / power / resistance and charge / discharge voltage detection signals of the test power storage device in charge / discharge control into digital data and transmits the digital data to the computer, and the computer acquires the digital data. In a charge / discharge test system for a power storage device,
The charging / discharging device samples the detection signals of the charging / discharging current / power / resistance and charging / discharging voltage at high speed and converts them into digital data, and the digital data has a transient region designated in advance by the computer. In the vicinity, digital data is acquired for a preset time, and in parallel with this, digital data over a long period from the start to the end of one measurement is thinned out, and the same timing information is obtained for each of these digital data. A means for performing an association by adding to the computer for high-speed transmission;
The computer includes means for performing data processing by associating the digital data acquired in the transient region with the digital data acquired by thinning out based on the timing information added to the received digital data.

(2) The charge / discharge device comprises:
An AD converter that samples charge / discharge current / power / resistance and charge / discharge voltage detection signals at high speed and converts them into digital data;
Among the digital data converted by the AD converter, a digital low-pass filter that removes noise components from digital data over a long period of time;
Among the digital data converted by the AD converter, a transient recorder that acquires data in a transient region at the time of switching between charging, discharging, and resting mode for a certain period of time;
A timing information adding circuit for thinning out the digital data processed by the digital low-pass filter and adding a marker for stored data;
A timing information adding circuit for adding a marker for transient data to the data acquired by the transient recorder;
A LAN transmission / reception processing unit for high-speed transmission of digital data added with a marker in the timing information addition circuit to the computer side;
It is provided with.

  (3) The computer includes means for setting a period during which the digital data of the transition region is acquired by dividing the period before the detection signal changes sharply and the time when the detection signal changes. .

  (4) The computer includes means for designating a storage interval of digital data when acquiring digital data over a long period of time.

  (5) The computer displays an indicator indicating that the digital data of the transient region is embedded on a graph displaying digital data over a long time, and when the indicator is designated, Means is provided for switching and displaying digital data.

  As described above, according to the present invention, the charge / discharge current / power / resistance and charge / discharge voltage detection signals are sampled at high speed and converted into digital data. In the vicinity of the area, digital data is acquired for a preset time, and in parallel with this, digital data over a long period from the start to the end of one measurement is thinned out, and these digital data have the same timing information. Are added to each other to perform high-speed transmission to the computer side, and the computer side associates the digital data based on the timing information added to the transmitted digital data and performs data processing. Simplified, accurate measurement data can be obtained in a long-time charge / discharge test. Also charged, discharging, there is a properly acquired can effectively detailed data of the transient region when switching modes pause.

  FIG. 1 shows a system configuration diagram of the present embodiment. 5 is different from FIG. 5 in that the communication system for transferring measurement data from the high-speed sampling device 40 to the personal computer 100 via USB is removed, and the control CPU 31 of the charge / discharge power supply 30 is measured by high-speed sampling and AD conversion. An AD converter that can acquire data is installed, and the personal computer 100 and the charging / discharging device 200 are connected via a LAN capable of transmitting digital data at high speed, for example, Ethernet, and the Ethernet 100 is used to send high-speed sampled measurement data to the personal computer 100 side. It is configured to transfer.

  The measurement data acquisition function configuration in the control CPU 31 is shown in FIG. 2 and enables acquisition of charge / discharge measurement data over a long period of time and acquisition of detailed data of transient phenomena when switching between charging, discharging, and resting modes. .

  In the following description, measurement control of charge / discharge current and voltage measurement data is shown, but the same control is performed when charge / discharge power or resistance is used instead of charge / discharge current.

  In FIG. 2, an FG (function generator) 51 obtains setting conditions and charging / discharging control signals for each mode such as charging, discharging, and rest set on the personal computer 100 side, along with a mode switching control signal according to the setting conditions. The discharge current or voltage signal is converted into an analog signal by the DA converter 52 and sent to the analog electronic circuit 32.

  The AD converter 53 converts the charge / discharge voltage for the storage battery 300 detected by the analog electronic circuit 32 into digital data by performing high-speed sampling (for example, at intervals of 10 milliseconds). The digital low-pass filter 54 removes noise components from the converted digital signal. The transient recorder 55 acquires the data of the transition region of the designated mode from the digital data sampled at a high speed by high-speed sampling (for example, every 10 milliseconds) for a certain time (for example, 1 minute).

  The timing information adding circuit 56 receives a mode switching signal from an FG (function generator) 51 as timing information, thins out the digital voltage data processed by the digital low-pass filter 54 at an interval at which it is saved in a file, and sets a saved data marker. Append. Similarly, the timing information adding circuit 57 receives a mode switching signal from the FG (function generator) 51 as timing information, and adds a transient data marker to the data acquired by the transient recorder 55.

  Similarly, the AD converter 58 converts the charging / discharging current for the storage battery 300 detected by the analog electronic circuit 32 into a digital signal at high speed sampling (for example, at intervals of 10 milliseconds), noise component removal by the digital low-pass filter 59 and the transient recorder. 60, the transition region data is acquired, and timing information is added to these data by the timing information adding circuits 61 and 62.

  The Ethernet transmission / reception processing unit 63 transmits the voltage and current data to which the timing information is added by the timing information adding circuits 56, 57, 61, 62 to the personal computer 100 side. Note that the description of the Ethernet transmission / reception processing unit that takes in the setting conditions of each mode from the personal computer 100 side and the charge / discharge control signal to the charge / discharge device side is omitted.

  FIG. 3 shows an example of a charge / discharge test setting screen by an application on the personal computer side, and conditions can be set for each mode of charging, resting, and discharging on this screen. In each mode, any one of charging, discharging, and resting is set by a number as a step number. In the “Steptime” column, a time for continuing the mode is set. Whether to operate the transient recorder for each mode can be set by checking in the Transient recorder column, and the necessary minimum data can be acquired. The period for acquiring the data can be set by dividing the period before the detection signal changes sharply and the time when the detection signal changes. In addition, the measurement data storage interval can be normally set by the sample interval (digital data acquisition for a long time). The setting information is transferred to the charge / discharge device 200, and the above-described data processing and charge / discharge control are performed by the control CPU 31 in the device.

  Taking step “3” as an example, the discharge is set to continue for 2 hours, and normal measurement data is stored at an interval of 10 seconds, and in the area where step “2” is switched to step “3”. It is set to operate the transient recorder. In this screen setting, the transient recorder is also activated in step “2” set in the sleep mode. In this way, the transient recorder can be operated by designating only a specific mode regardless of the mode.

  FIG. 4 shows a graph display example of long-term data and transient data acquired on the personal computer side. On the graph that displays normal measurement data, an indicator with a “□” mark indicating that transient data is embedded is displayed. When the user indicates (clicks) this, it is surrounded by a “circle” mark. A function for switching and displaying the transient data of the portion D.

The block diagram of the charging / discharging test system which shows embodiment of this invention. The measurement data acquisition function block diagram. An example of a charge / discharge test setting screen. Graph display example of measured data. The block diagram of the conventional charging / discharging test system. An example of graph display of charge / discharge current and voltage.

Explanation of symbols

100 PC
200 Charging / Discharging Device 300 Test Battery 10 Charging / Discharging Control Application Software 20 Data Acquisition Application Software 30 Charging / Discharging Power Supply 40 High-Speed Sampling Device 51 FG (Function Generator)
52 DA converter 53, 58 AD converter 54, 59 Digital low-pass filter 55, 60 Transient recorder 56, 57, 61, 62 Timing information addition circuit

Claims (5)

A computer capable of generating test condition settings and charge / discharge control signals for charging, discharging, and resting modes of the test power storage device, and the test power storage device according to the test conditions and charge / discharge control signal transmitted from the computer A charge / discharge device for controlling charge / discharge current / power / resistance and charge / discharge voltage,
The charge / discharge device converts charge / discharge current / power / resistance and charge / discharge voltage detection signals of the test power storage device in charge / discharge control into digital data and transmits the digital data to the computer, and the computer acquires the digital data. In a charge / discharge test system for a power storage device,
The charging / discharging device samples the detection signals of the charging / discharging current / power / resistance and charging / discharging voltage at high speed and converts them into digital data, and the digital data has a transient region designated in advance by the computer. In the vicinity, digital data is acquired for a preset time, and in parallel with this, digital data over a long period from the start to the end of one measurement is thinned out, and the same timing information is obtained for each of these digital data. A means for performing an association by adding to the computer for high-speed transmission;
The computer includes means for associating the digital data acquired in the transient region with the digital data acquired by thinning out based on the timing information added to the received digital data, and processing the data. Equipment charge / discharge test system. The charging / discharging device
An AD converter that samples charge / discharge current / power / resistance and charge / discharge voltage detection signals at high speed and converts them into digital data;
Of the digital data converted by the AD converter, a digital low-pass filter that removes noise components from digital data over a long period of time;
Among the digital data converted by the AD converter, a transient recorder that acquires data in a transient region at the time of switching between charging, discharging, and resting mode for a certain period of time;
A timing information adding circuit for thinning out the digital data processed by the digital low-pass filter and adding a marker for stored data;
A timing information adding circuit for adding a marker for transient data to the data acquired by the transient recorder;
A LAN transmission / reception processing unit for high-speed transmission of digital data added with a marker in the timing information addition circuit to the computer side;
The charge / discharge test system for a power storage device according to claim 1, comprising:   2. The computer according to claim 1, further comprising means for setting a period during which the digital data in the transition region is acquired by dividing the period before the detection signal changes sharply and the time when the detection signal changes. Or a charge / discharge test system for a power storage device according to 2;   The charge / discharge test system for a power storage device according to claim 1, wherein the computer includes means for designating a storage interval of digital data when acquiring digital data over a long period of time.   The computer displays an indicator indicating that the digital data in the transition region is embedded on a graph displaying digital data over a long period of time, and when this indicator is designated, the digital data in the transition region is displayed. The charge / discharge test system for a power storage device according to any one of claims 1 to 4, further comprising means for switching display.

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