JPH09281202A - Battery measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously measure the internal resistance and inter-terminal DC voltage of a battery and to decide the deterioration state of this battery. SOLUTION: This instrument has an AC constant current source 10 which impresses an AC current via a coupling capacitor 11 to the battery BT, an internal resistance detecting section (detecting circuit) 20 which detects the internal resistance by the AC voltage signal generated between the terminals of the battery BT at the time of impressing the AC current and a voltage detecting section 30 which detects the inter-terminal DC voltage of the battery BT. The deterioration state of the battery BT is decided from the internal resistance and the inter-terminal DC voltage in a CPU 52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery measuring device, and more specifically, to a battery measuring device capable of simultaneously measuring the internal resistance and terminal voltage of the battery and determining the deterioration state of the battery from those measured values. It relates to the device.

[0002]

2. Description of the Related Art Although this battery measuring device is also called a battery tester, the deterioration state of a battery is generally judged by its internal resistance (equivalent series resistance) and its DC voltage across its terminals. That is, as the deterioration progresses, the internal resistance tends to increase and the inter-terminal DC voltage tends to decrease.

Therefore, conventionally, an AC resistance meter (for example, A
CmΩ meter) and two testers are prepared, the internal resistance of the battery is measured with an AC resistance meter, and the DC voltage between its terminals is measured with the tester, and then the battery is deteriorated based on those measured values. I am trying to judge the state. Since the internal resistance of the battery has temperature dependency, if more accuracy is required, measure the ambient temperature with a thermometer and consider the temperature value as reference data for deterioration determination. ing.

[0004]

However, according to this method, two measuring devices are required, and the internal resistance and the DC voltage between terminals must be measured separately, which makes the measurement work complicated. There is no denying it. Also,
When the temperature is taken into consideration as reference data, it is necessary to measure the temperature with a thermometer, which further increases the work load.

Further, even if the deterioration state of a battery is judged based on those measured values, the threshold value as a judgment criterion varies depending on the battery. There was the annoyance of having to make a decision after examining it.

The present invention has been made to solve such a conventional problem, and its main purpose is to be able to simultaneously measure the internal resistance of a battery, the DC voltage between terminals and the like by one operation, and It is an object of the present invention to provide a battery measuring device capable of automatically performing even deterioration determination based on a measured value.

[0007]

In order to achieve the above object, the present invention provides an AC constant current source for applying an AC current to a battery to be measured through a coupling capacitor, and an AC constant current source when applying the AC current. In the internal resistance detection unit for detecting the internal resistance of the battery by the AC voltage signal generated between the terminals, a voltage detection unit for detecting the DC voltage between the terminals of the battery, the internal resistance detection unit and the voltage detection unit And a deterioration determination unit that determines the deterioration state of the battery on the basis of the internal resistance and the DC voltage between the terminals detected in 1.

In this case, the internal resistance detecting section is connected via a coupling capacitor between the terminals of the battery and is composed of a detection circuit for detecting a voltage proportional to the internal resistance of the battery in synchronization with the phase of the AC constant current source. can do.

Instead of the AC constant current source, an AC low voltage source may apply an AC voltage to the battery. In this case, the internal resistance detection circuit detects the internal resistance by the AC current signal flowing between the terminals of the battery when the AC voltage is applied, or the AC current signal flowing between the terminals of the battery and the terminal of the battery when the AC voltage is applied. The internal resistance can be detected by the AC voltage signal generated between them.

In the former case, the internal resistance detection circuit uses a detection circuit which detects a current value which is in inverse proportion to the internal resistance of the battery in synchronization with the phase of the AC low voltage source, and in the latter case, the internal resistance detection circuit. For this, a detection circuit that simultaneously detects a current value that is inversely proportional to the internal resistance of the current in synchronization with the phase of the AC low voltage source and a voltage that is proportional to the internal resistance of the battery is used.

When the polarity of the battery is reversed with respect to the measuring terminal (probe), the inter-terminal DC voltage detected by the voltage detecting section becomes a negative value, and as it is compared with the predetermined threshold value. If it does, even if it is a good product, it will be judged as deterioration.
Therefore, it is preferable that at least the inter-terminal voltage is always processed as a positive value as an absolute value. Note that the polarity of the inter-terminal DC voltage detected by the voltage detection unit may be determined, and when the battery connection is reversed, a caution may be given by a display or a buzzer.

Further, the deterioration determining section includes an A / D conversion circuit for converting each detection signal detected by the internal resistance detecting section and the voltage detecting section into digital data, a data memory for storing the data, and a battery. A control memory that stores threshold data such as resistance thresholds and voltage thresholds for deterioration determination, and the internal resistance measurement value of the battery and the inter-terminal DC voltage measurement value are written to the data memory, and the internal resistance measurement value is also written. And a control unit (CPU) for judging the deterioration of the battery by comparing the measured value of the resistance threshold value and the DC voltage between terminals with the voltage threshold value. The deterioration judgment unit displays the judgment result on a display or It is displayed on the display such as a printer.

The internal resistance detecting section and the voltage detecting section are alternately switched by a changeover switch, and the respective detection signals are input to the A / D conversion circuit to measure the internal resistance measurement value of the battery and the DC voltage between terminals. It is preferable that the value and the value are sequentially loaded into the data memory.

Here, the resistance thresholds are α and β (where α <
β), when the voltage threshold is γ, the resistance measurement value is R, and the inter-terminal DC voltage measurement value is V, the CPU has R ≦ α and V
> Γ, it is determined as a good product, and R ≦ α and V ≦ γ, α <
When R ≦ β and V> γ, α <R ≦ β and V ≦ γ, it is determined to be caution, and when R> β and V> γ, R> β and V ≦ γ, it is determined to be deterioration. Then, the determination result is displayed on the display unit. In this case, in the above inequalities, the part of the “<” symbol is replaced with the “≦” symbol, and
The part of the “≦” symbol may be replaced with the “<” symbol.

In the above caution determination, when R ≦ α and V ≦ γ, and when α <R ≦ β and V> γ or α <R.
In the case of ≦ β and V ≦ γ, it is preferable to display them on the display section in a distinguishable manner, even though the same caution determination is made.

That is, when R ≦ α and V ≦ γ,
The cause is considered to be a short circuit of the battery cell and a case due to over-discharge, and it cannot be determined that the defect is unconditional. Therefore, for example, by displaying the word "WARNING" meaning caution, by flashing display, α <R≤β and It can be distinguished from the case of V> γ or α <R ≦ β and V ≦ γ.

Range setting information for the analog measuring section including the detection circuit and the voltage detecting section is written in advance for each threshold data in the control memory, but the threshold data is changed by the operating section such as a keyboard. Therefore, it is preferable that the range of the analog measuring unit can be switched.

According to this, the threshold value data can be easily changed by, for example, key operation of the operation unit according to the rating or type of the battery as the measurement object, and the range of the analog measurement unit can be changed accordingly. Since they are switched, the workability of measurement is greatly improved.

The battery measuring device further includes a temperature detecting section for directly detecting the terminal temperature of the battery, and a probe including a pair of openable and closable arms for holding the terminal section of the battery. Then, the temperature detection unit can be selectively switched by a changeover switch together with the detection circuit and the voltage detection unit, and the terminal temperature data thereof is stored in the data memory in relation to the resistance value and the voltage value of the battery. .

In this case, a measuring electrode commonly used for the detection circuit and the voltage detecting section is attached to the tip of each probe arm, and the temperature detecting section can be brought into contact with the battery terminal section in either one of the arms. It is preferably incorporated.

According to this, since the terminal temperature of the battery is measured at the same time as the measurement of the internal resistance and the DC voltage between the terminals, it is possible to save the labor of separately preparing a thermometer and measuring the temperature as in the conventional case. Since the temperature detector directly contacts the terminal, the accurate temperature of the terminal can be obtained.

The temperature detecting section is preferably attached to the probe arm via an elastic body such as rubber.
According to this, since the temperature detecting portion abuts on the terminal in a wider area, a more accurate temperature of the terminal can be obtained.

Further, in this battery measuring device, the probe is provided with a memory trigger switch for instructing the CPU to load the measurement data into the data memory, and the CPU is instructed by the memory trigger switch. The measured data at the time point is loaded into the data memory.

According to this, a large number of batteries are arranged, such as UPS (Uninterruptible Power Supply),
When data such as internal resistance is taken by applying a probe to each of them, without releasing the probe, press the memory trigger switch on the same probe provided on the probe to save the data to the memory. Can be captured.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Next, in order to better understand the technical idea of the present invention, embodiments thereof will be described with reference to the drawings.

FIG. 1 is a schematic block diagram showing the overall structure of this battery measuring device (battery tester).
According to this, the device is an AC constant current source 10 as a measurement signal source that applies a measurement signal to the battery BT that is the measurement target.
And an internal resistance detection unit 20 for detecting the internal resistance of the battery BT.
And a voltage detection unit 3 for detecting a DC voltage between terminals of the battery BT
0 and the temperature detection unit 40 that detects the terminal temperature of the battery BT
And a digital processing section 50 for digitally processing the detection signals from these detection sections.

In this embodiment, the power supply voltage of the AC constant current source 10 is extremely small, on the order of several mV, and an AC signal as a measurement signal is supplied from the AC constant current source 10 to the battery BT via the coupling capacitor 11. It

The internal resistance detecting section 20 has a pair of measuring electrodes 21 and 22 connected to the respective terminals of the battery BT, and its input side is connected to the measuring electrodes 21 and 22 via coupling capacitors 23 and 24, respectively. It is composed of an amplifier 25 and a detection circuit 26 connected to the next stage of the amplifier 25. In this case, the detection circuit 26 is synchronized with the phase of the AC constant current source 10.

According to the internal resistance detection unit 20, the battery B
The voltage drop due to the internal resistance (equivalent series resistance) of T is amplified by the amplifier 25 in a predetermined manner, and is detected by the detection circuit 26 in synchronization with the phase of the alternating current source 10, whereby the effective resistance of the battery BT. Only detected.

The voltage detector 30 attenuates the DC voltage between the terminals obtained from the measuring electrodes 21 and 22 to a predetermined value (for example, 1/1).
It has an attenuator 31 for 0 or 1/100) and an amplifier 32 connected to the output side of the attenuator 31.

The temperature detecting section 40 has a temperature sensor 41 which can be brought into direct contact with the terminal of the battery BT. In this case, as will be described later, this temperature sensor 41 is connected to the measuring electrode 2.
It is incorporated in the same probe with 1 and 22.

The digital processing section 50 includes an A / D conversion circuit 51 and a CPU as a control section connected to its output side.
52. A switch SW is provided on the input side of the A / D conversion circuit 51 to select one of the contact a of the detection circuit 26, the contact b of the voltage detection unit 30, and the contact c of the temperature detection unit.

The switch SW is sequentially controlled to be switched by the CPU 52, whereby each of the detection units 20, 30,
A measurement signal from 40 is converted into digital data by an A / D conversion circuit 51 and taken into a RAM (data memory) 53.

In this case, as illustrated in FIG.
Write areas for internal resistance data, inter-terminal DC voltage data, temperature data, and determination results are set in the areas 1, 2, ... Of the RAM 53, and the switch SW is, for example, contact a → contact b → contact c. By sequentially switching, each detection unit 20, 30, 40 for one measurement
The measurement data from are written in the corresponding area and are displayed on the display 54. In the judgment result column, there are "PASS", "WARNING", "FA" as judgment results at the time of deterioration judgment described later.
"IL" is written.

Further, the ROM 55 as a control memory stores threshold value data for deterioration determination. In this embodiment, two thresholds α,
β (where α <β) and one threshold value γ as the threshold value of the inter-terminal DC voltage are set, and the CPU 52, for example, each time resistance data and voltage data are loaded into the RAM 53, the resistance measurement value and the voltage The deterioration determination is performed by comparing the measured value with each threshold value corresponding thereto.

Here, an example of deterioration determination will be described based on the deterioration determination table of FIG. 3 where R is the measured value of the internal resistance and V is the measured value of the inter-terminal DC voltage. First, if R ≦ α and V> γ, it is determined to be a non-defective product, and “PASS”, which means a non-defective product, is displayed on the display 54. Next, R ≦ α and V ≦ γ, α <R ≦ β and V> γ, α <R ≦
If either β and V ≦ γ, it is determined to be caution, and the display 54 is called, for example, “WARNIN
G ”is displayed. Next, when R> β and V> γ, or R> β and V ≦ γ, it is determined that the product is deteriorated, and the display 54 indicates, for example, “FAIL” indicating that the product is deteriorated.

Note that R ≦ α and V ≦ γ included in the above
In this case, the cause may be a short circuit of the battery cell or a case of over-discharge, and it is dangerous to unconditionally determine that the battery cell is defective. Therefore, in the present invention, in such a case, “WARNING” meaning caution is used as, for example, a flashing display, and α <R ≦ β and V> γ or α <R ≦ β and V ≦ γ, even though the same caution determination is made. The case can be identified and the measurer is urged to re-measure.

By the way, the battery BT as a sample was discharged,
If the voltage does not rise sufficiently, it can be determined that the battery cell is short-circuited, whereas if the voltage rises sufficiently, it can be determined that it is due to overdischarge. Although no special threshold value is set for the temperature of the battery BT, if the terminal temperature shows a remarkable temperature rise, it can be determined that the battery BT has a failure. Since it is known that there is a correlation between the temperature and the internal resistance, the reliability of the deterioration determination can be further increased by adding the temperature data.
In this example, two thresholds α and β are set as the resistance thresholds and one threshold γ is set as the voltage threshold, but this is an example, and how to set the thresholds is arbitrary.

The battery BT to be measured is not limited to one type, but in terms of rated voltage, for example, 1.2V to 1V.
There are those with a rated voltage of 2V or higher. In order to deal with this, in this battery measuring device, RO
The threshold data (resistance threshold value, voltage threshold value, etc.) of each battery BT to be measured and preferable range information applied at the time of measurement are written in M55 in advance, and the threshold data is changed by the operation unit 56. Accordingly, the analog measurement unit, in this example, the power supply voltage of the AC constant power supply 10, the amplification degree of the resistance detection unit 20, and the attenuation rate of the voltage detection unit 30 are automatically changed. Has become.

For example, describing the range information,
Three types of 0: 300 mΩ, 1: 3Ω, and 2: 30Ω are prepared, and preferable range information is set for each threshold value data. Therefore, by changing the threshold data with the operation unit 56, the range of the analog measuring instrument suitable for it is automatically set.

Further, this battery measuring device is equipped with the probe 60 shown in FIG. In addition, this probe 6
Although 0 is actually used as a pair, one of the sides having the temperature sensor 41 will be described here. That is, it should be understood that the other probe (not shown) has the same configuration except that the temperature sensor is not provided.

The probe 60 is provided with a pair of arms 61 and 62 that are openably and closably combined via a connecting shaft 63. The arms 61 and 62 are constantly urged in the closing direction by a spring 64 attached to the connecting shaft 63, and the measurement electrodes 21 (22) and 211 (221) are attached to the tips thereof. In this case, the measurement electrode 211 (221)
Is a source side electrode. The measurement electrodes 21 and 211 are made of metal pieces having appropriate elasticity, and FIG. 5 shows a state in which the terminal T of the battery BT is sandwiched.

In this embodiment, one arm 62 is provided so as to come into contact with the temperature sensor 41 or the terminal T. The temperature sensor 41 is attached to the arm 62 via an elastic body 65 such as rubber so that it can movably contact the terminal T. This means that the terminal T can be contacted with a wider surface. Further, the temperature detecting surface of the temperature sensor 41 is covered with a metal protective cover 66.

According to this probe 60, the arms 61,
By opening 62 and engaging the measurement electrodes 21 and 211 with the terminal T of the battery BT, the temperature sensor 41 is connected to the terminal T.
Since the temperature is measured simultaneously with the measurement of the internal resistance and the DC voltage between the terminals, it is possible to save the trouble of twice using a temperature sensor as in the conventional case.

By the way, as shown in FIG. 1, the digital processing section 50 is provided with a memory trigger key 57 for instructing the CPU 52 to load the measurement data into the RAM 53. When a large number of batteries are lined up, such as a power supply device), and probes are applied to each one to obtain data such as internal resistance, release the probe one by one and press the memory trigger key 57. Is annoying.

Therefore, in the present invention, the probe 60 is provided with the memory trigger key 57 so that the measurement data can be taken into the RAM 53 for each measurement operation without releasing the probe. The memory trigger key 57 may be provided on one of the probes 60, and is preferably arranged at a position where it can be easily pressed with a finger.

As described above, each time the memory trigger key 57 is pressed, one data (resistance value, voltage value and temperature value in this example) is taken into the RAM 53, but the memory trigger key 57 is in this 1 data storage mode. In addition, the operation unit 56 can be switched to the one data erasing mode.

That is, when the 1-data erasing mode is set, RA is set every time the memory trigger key 57 is pressed.
The data is sequentially erased one by one from the latest data side in M53. When there is no particular mode designation as described above from the operation unit 56 and only a measurement start instruction is given, the CPU 52 sequentially switches the switches SW to the contacts a to c, writes each measurement data in the RAM 53, and Each measurement data and deterioration determination result are displayed on the display 54.

[0049]

As described above, according to the present invention,
An AC constant current source that applies an AC current as a measurement signal to the battery as the measurement target, and an internal resistance detection unit that detects the internal resistance of the battery by an AC voltage signal generated between the terminals of the battery when the AC current is applied. A voltage detection unit that detects a DC voltage between terminals of the battery, and a deterioration determination unit that determines the deterioration state of the battery based on the internal resistance detected by the internal resistance detection unit and the voltage detection unit and the DC voltage between the terminals. Therefore, the deterioration state of the battery can be determined by one measuring device.

In this case, the internal resistance value and the inter-terminal DC voltage value are taken into the data memory via the A / D conversion circuit via the change-over switch, and the measured value and threshold data are stored in the CPU. Make a comparison judgment with
By displaying the result on the display unit, it is possible to know the deterioration state of the battery by an extremely simple operation.

Further, assuming that the threshold values for the internal resistance are α and β (where α <β), the threshold value of the DC voltage between the terminals is γ, the measured internal resistance value is R, and the measured voltage value is V, R ≦ α and V>
If γ, it is determined as a good product, and R ≦ α and V ≦ γ, α <R
When either ≦ β and V> γ, α <R ≦ β and V ≦ γ, it is determined to be caution, and when R> β and V> γ, R> β and V ≦ γ, it is determined to be deterioration. Therefore, a more accurate determination result can be obtained.

In the above caution determination, R≤
In the case of α and V ≦ γ and the case of α <R ≦ β and V> γ or α <R ≦ β and V ≦ γ, the same caution determination is made, but they can be distinguished on the display section. Since it is displayed, careless misjudgment is prevented.

Further, the threshold value data can be easily changed by, for example, key operation of the operation unit according to the rating or type of the battery as the measurement object, and the range of the analog measurement unit is switched according to the change. By doing so, the workability of measurement is significantly improved.

Further, according to the present invention, since the terminal temperature of the battery is measured at the same time when the internal resistance and the DC voltage between the terminals are measured, it is troublesome to prepare a thermometer separately and measure the temperature as in the conventional case. I can omit it. In this case, by mounting the temperature detection unit on the arm via an elastic body such as rubber, the temperature detection unit abuts the terminal over a wider area, so that an accurate temperature of the terminal can be obtained.

Further, in the case where a large number of batteries such as UPS (uninterruptible power supply) are arranged and a probe is applied to each one to obtain data such as internal resistance, the present invention is applicable. According to this, the data can be taken into the memory by pushing the memory trigger switch at the hand provided on the probe without releasing the hand from the probe.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing an embodiment of a battery measuring device according to the present invention.

FIG. 2 is an explanatory diagram showing an arrangement of storage areas of a data memory in the block diagram.

FIG. 3 is an explanatory diagram for explaining a criterion used for determining a battery deterioration state.

FIG. 4 is an explanatory diagram for explaining data stored in a control memory in the block diagram.

FIG. 5 is a cross-sectional view showing a probe used in this battery measuring device.

[Explanation of symbols]

 10 AC Current Sources 11, 23, 24 Coupling Capacitor 20 Resistance Detection Section 21, 22 Measurement Electrode 26 Detection Circuit 30 Voltage Detection Section 31 Attenuator 40 Temperature Detection Section 41 Temperature Sensor 50 Digital Processing Section 51 A / D Conversion Circuit 52 CPU 53 Data memory 54 Display 55 Control memory 56 Operation part 57 Memory trigger key 60 Probe BT Battery T terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Mizuno 81 Sakurazamachi, Oizumi, Ueda, Nagano Prefecture, Hioki Electric Co., Ltd. Within

Claims (15)

[Claims] 1. An internal constant current source for applying an alternating current to a battery to be measured through a coupling capacitor and an alternating voltage signal generated between terminals of the battery when the alternating current is applied to the inside of the battery. The internal resistance detection unit for detecting the resistance, the voltage detection unit for detecting the DC voltage between the terminals of the battery, the internal resistance detected by the internal resistance detection unit and the voltage detection unit and the DC voltage between the terminals A battery measuring device comprising: a deterioration determining unit that determines a deterioration state of a battery. 2. An internal constant voltage source for applying an alternating voltage to a battery to be measured through a coupling capacitor and an internal current resistance of the alternating current signal flowing between the terminals of the battery when the alternating voltage is applied. An internal resistance detection unit that detects the voltage, a voltage detection unit that detects the DC voltage between the terminals of the battery, an internal resistance detected by the internal resistance detection unit and the voltage detection unit and the DC voltage between the terminals of the battery A battery measuring device, comprising: a deterioration determining unit that determines a deterioration state. 3. An AC constant voltage source for applying an AC voltage to a battery to be measured through a coupling capacitor, an AC current signal flowing between the terminals of the battery when the AC voltage is applied, and a terminal of the battery. An internal resistance detection unit that detects the internal resistance of the AC voltage signal generated between them,
A voltage detection unit that detects a DC voltage between terminals of the battery, and a deterioration determination unit that determines the deterioration state of the battery by the internal resistance detected by the internal resistance detection unit and the voltage detection unit and the DC voltage between the terminals. And a battery measuring device. 4. The internal resistance detector is connected between terminals of the battery via a coupling capacitor and detects a voltage proportional to the internal resistance of the battery in synchronization with the phase of the AC constant current source. The battery measuring device according to claim 1, comprising a detection circuit. 5. The internal resistance detection unit is connected between terminals of the battery via a coupling capacitor, and detects a current value inversely proportional to the internal resistance of the battery in synchronization with the phase of the AC constant voltage source. 3. The battery measuring device according to claim 2, wherein the battery measuring device comprises: 6. The internal resistance detection unit is connected between terminals of the battery via a coupling capacitor, and a current value that is in inverse proportion to the internal resistance of the battery in synchronization with the phase of the AC constant voltage source, 4. The battery measuring device according to claim 3, comprising a detection circuit that simultaneously detects a voltage proportional to the internal resistance of the battery. 7. The A / D conversion circuit for converting the respective detection signals detected by the internal resistance detection section and the voltage detection section into digital data, and the data memory for storing the data. And a control memory in which threshold data such as a resistance threshold and a voltage threshold for battery deterioration determination are stored, and the internal resistance measurement value of the battery and the inter-terminal DC voltage measurement value are written in the data memory,
And a control unit (CPU) that compares the internal resistance measurement value with the resistance threshold value and the inter-terminal DC voltage measurement value with the voltage threshold value to determine deterioration of the battery. Item 4. The battery measuring device according to item 1, 2 or 3. 8. The deterioration determination unit further includes a changeover switch that alternately switches the internal resistance detection unit and the voltage detection unit and supplies each detection signal thereof to the A / D conversion circuit. The battery measuring device according to claim 7. 9. The resistance threshold values are α, β (where α <
β), when the voltage threshold is γ, the resistance measurement value is R, and the voltage measurement value is V, the CPU determines that the product is a good product if R ≦ α and V> γ, and R ≦ α and V ≦ γ, α <R ≦ β and V> γ, α <R ≦
When β and V ≦ γ, it is determined to be caution, when R> β and V> γ, and R> β and V ≦ γ, it is determined to be deterioration, and the determination result is displayed on the display unit. The battery measuring device according to claim 7. 10. In the above caution determination, R ≦ α and V
≦ γ and α <R ≦ β and V> γ or α <R ≦
10. The battery measuring device according to claim 9, wherein the same caution determination is made when β and V ≦ γ, but they are displayed in a distinguishable manner on the display unit. 11. An operating section for giving various instruction signals to the CPU is further provided, and the control memory has range setting information for the analog measuring section including the detection circuit and the voltage detecting section as threshold data. The battery according to any one of claims 7 to 10, wherein the range of the analog measurement unit is switched as the threshold data is changed by the operation unit. measuring device. 12. A temperature detecting section for directly detecting a terminal temperature of the battery is further provided, and the temperature detecting section can be selectively switched by the changeover switch together with the detection circuit and the voltage detecting section. 9. The battery measuring device according to claim 8, wherein the terminal temperature data is stored in the data memory in association with the internal resistance value and the DC voltage value between terminals of the battery. 13. A pair of openable and closable arms for holding a terminal portion of the battery, each of which has a measurement electrode attached to the detection circuit and the voltage detection portion at its tip, and either 13. The battery measuring device according to claim 12, wherein one of the arms is provided with a probe in which the temperature detecting unit is incorporated so as to come into contact with the terminal of the battery. 14. The battery measuring device according to claim 13, wherein the temperature detecting unit is attached to the arm via an elastic body such as rubber. 15. The probe is provided with a memory trigger switch for instructing the CPU to load the measurement data into the data memory, and the CPU is at a time point when the instruction by the memory trigger switch is given. 15. The battery measuring device according to claim 13 or 14, wherein the measurement data of 1. is stored in the data memory.