JP2003121516A - Measurement device for internal resistance of storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure the internal resistance of a plurality of storage batteries which are in usage state, as they are, connected to a battery charger and a load, without disconnecting the storage batteries. SOLUTION: A circuit, having the storage batteries 2a, 2b, 2c connected in series, is connected in parallel to the battery charger 1 via a current measurement instrument 3 in series, and therewith connected in parallel to a load 4. Then the alternating current of a constant current is sequentially provided to the both terminals of each storage battery 2a, 2b, 2c from the power source 5 of the alternating current of the constant current, and the voltage drop of each storage battery 2a, 2b, 2c at that time is sequentially measured with a voltage measurement instrument 6. Normally, a constant voltage is applied to each storage battery 2a, 2b, 2c from the battery charger 1, and therewith a current is fed to the load 4. In this state, the power source 5 of the alternating current of the constant current is connected to one of the storage batteries 2a, 2b, 2c, and then the voltage drop of the storage battery at that time is measured with the voltage measurement instrument 6, and therewith the current is measured with the current measurement instrument 3. A current, flowing in the storage, is determined by deducing the current value measured with the current measurement instrument 3 from a constant-current value, provided from the power source 5 of the alternating current of the constant current, and then the internal resistance of the battery is determined from this current and the voltage drop measured with the voltage measuring instrument 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage battery internal resistance measuring device for measuring the internal resistance of a storage battery in use which is connected to a charger and a load.

[0002]

2. Description of the Related Art With the advent of sealed batteries, maintenance-free batteries have become possible, and batteries can be used almost without maintenance. Further, battery manufacturing technology and quality control are improved, the failure rate is reduced, the service life is extended, and the battery is easy to use.

However, even if the life is extended, the life is not exhausted, and it is important to replace the battery before the life in a device that drives a load with the battery as a power source. The life of a battery is affected by various factors such as the operating temperature of the battery and the number of charge / discharge cycles. Generally, the life of a battery is determined by the service life, and the battery is replaced when it reaches the service life.

However, there is a problem when the life of the battery is determined by the useful life as described above. That is, there is a problem that the battery will reach the end of its service life before it reaches the end of its useful life if it is used under adverse environmental conditions such as high ambient temperature. Even if the battery life is not reached, the battery will be replaced when the service life is reached, which is uneconomical.

As a solution to this, there is a method of determining the life of the battery by measuring the internal resistance of the battery. That is, the internal resistance of the battery is closely related to the battery life, and the battery can be replaced at an appropriate timing if the battery life is judged by measuring the internal resistance of the battery.

In measuring the internal resistance of the battery, a constant current AC is supplied to the battery, and a voltage drop occurs due to the internal resistance at this time. Therefore, the internal resistance value can be measured by measuring the voltage.

[0007]

However, in the past, a plurality of batteries in use connected to a charger and a load were stopped by disconnecting the device and measuring the internal resistance one by one. It was impossible to measure unless it was possible. Also, since the device is stopped, the measurement interval is widened so that it does not significantly affect the operation of the device, which may cause a large change in the battery characteristics between the previous measurement and the next measurement. However, there is also a problem that the operation of the device is adversely affected.

Therefore, according to the present invention, it is possible to measure the internal resistances of a plurality of storage batteries connected to a charger and a load without disconnecting the storage batteries in the in-use state, and to perform accurate measurement. Provide a device.

[0009]

The invention according to claim 1 is
A storage battery circuit in which a plurality of storage batteries are connected in series and each connected to a charger and a load, a current measuring device inserted in series in this storage battery circuit, and a constant current AC is individually supplied to each storage battery. A constant current AC power supply and a voltage measuring device that measures the voltage drop of the storage battery that supplied the constant current AC from this constant current AC power supply are provided, and the current value of the constant current AC power supply and the current value and voltage measured by the current measuring device are set. The storage battery internal resistance measuring device measures the internal resistance of the storage battery to be measured from the voltage value measured by the measuring device.

According to a second aspect of the present invention, a plurality of storage batteries are connected in series, a storage battery circuit connected to a charger and a load, a current measuring device inserted in series in the storage battery circuit, and each storage battery. A plurality of constant current AC power supplies that supply constant current AC to the series circuit of the storage batteries of each group, and the individual storage batteries that supply constant current AC from each constant current AC power supply. A plurality of voltage measuring devices for measuring the voltage drop of each storage battery are provided, and the internal resistance of each storage battery is calculated from the current value of each constant current AC power supply, the current value measured by the current measuring device, and the voltage value measured by each voltage measuring device. It is in a storage battery internal resistance measuring device for measuring.

According to a third aspect of the present invention, a plurality of storage batteries are connected in series, a storage battery circuit connected to a charger and a load, a current measuring device inserted in series in the storage battery circuit, and each storage battery. A plurality of groups into a plurality of groups, and a constant current AC power supply that selectively supplies a constant current AC to the series circuit of the storage batteries of each group via a changeover switch and a constant current AC power supply from this constant current AC power supply A plurality of voltage measuring devices that measure the voltage drop of each storage battery that has been supplied are provided, and each of the current values of the constant current AC power supply, the current value measured by the current measuring device and the voltage value measured by each voltage measuring device The storage battery internal resistance measuring device measures the internal resistance of the storage battery.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) As shown in FIG.
A plurality of, for example, three storage batteries 2a, 2b, 2c are connected in series, and a storage battery circuit is connected in parallel via the current measuring device 3 in series and a load 4 is connected in parallel. In addition,
The number of storage batteries to be connected may be two or four or more.

Then, a constant-current AC power supply 5 is sequentially supplied to both ends of each of the storage batteries 2a, 2b, 2c, that is, between the poles of each storage battery, and each storage battery 2a, 2b at that time is supplied. , 2c are sequentially measured by the voltage measuring device 6.

This device always applies a constant voltage from the charger 1 to each of the storage batteries 2a, 2b, 2c, and at the same time, supplies a current to the load 4.

In this state, the constant current AC power supply 5 is first connected to the storage battery 2a, and the storage battery 2a at that time is connected.
Voltage drop is measured by the voltage measuring device 6 and the current is measured by the current measuring device 3, and then the constant current AC power supply 5 is connected to the storage battery 2b to measure the voltage drop of the storage battery 2b at that time. 6, the current is measured by the current measuring device 3, then the constant current AC power source 5 is connected to the storage battery 2c, and the voltage drop of the storage battery 2c at that time is measured by the voltage measuring device 6 and the current is measured. The work of measuring the current with the container 3 is performed to measure the internal resistance of each storage battery.

For example, as shown in the figure, when a constant current AC power supply 5 is connected between both ends of the storage battery 2b and a voltage measuring device 6 is connected to supply constant current AC from the constant current AC power supply 5, the constant current AC is supplied. Flows not only to the storage battery 2b but also to the charger 1 and the load 4. This is measured by the current measuring device 3.

Then, a value obtained by subtracting the current value measured by the current measuring device 3 from the constant current value from the constant current AC power supply 5 is set as the current value flowing in the storage battery 2b. And the voltage measuring device 6
The internal resistance of the storage battery 2b is obtained by dividing the voltage drop value measured in step 1 by this current value.

At this time, since the current flowing through the current measuring device 3 contains various components, the current measuring device 3 produces only the current component having the same frequency and the same phase as the constant current AC from the constant current AC power supply 5. I try to measure.

Further, the current from the charger 1 flows through each of the storage batteries 2a, 2b, 2c, and this current includes the ripple of the charger. Therefore, the frequency component of the constant current AC from the constant current AC power supply 5 is different from the frequency component of the ripple of the charger to prevent measurement error due to this.

In this way, the internal resistance of each storage battery 2a, 2b, 2c can be accurately measured without disconnecting the storage battery 2a, 2b, 2c from the device. Therefore, it is easy to perform the measurement at relatively short intervals. By knowing the internal resistance, the life of each storage battery 2a, 2b, 2c can be known,
Each storage battery can be replaced at an appropriate timing.

(Second Embodiment) As shown in FIG.
The charger 11 includes a plurality of, for example, six storage batteries 12a, 1
The storage battery circuit in which 2b, 12c, 12d, 12e, and 12f are connected in series is connected in parallel through the current measuring device 13 in series, and the load 14 is connected in parallel. The number of storage batteries to be connected is not limited to six.

The storage batteries 12a to 12c are grouped into one group, a constant current AC power supply 15a is supplied between both ends of a series circuit of the storage batteries 12a to 12c, and the storage batteries 12d to 12f are connected to another group. A constant current AC power supply 15b supplies constant current AC to the series circuit of the storage batteries 12d to 12f. Then, the voltage drop of each of the storage batteries 12a to 12f at this time is measured by the voltage measuring devices 16a, 16b, 16c, 16d, 16e,
The measurement is performed at 16f. The constant current AC power supplies 15a and 15b are configured to supply constant current AC having the same frequency and the same phase. The constant current AC power supplies 15a and 15b may be operated at the same time, but may be operated independently.

This device always operates from the charger 11 to the battery 1
A constant voltage is applied to 2a to 12f, and a current is passed through the load 14 with it.

In this state, the constant current AC power supply 15a supplies a constant current AC to the storage batteries 12a, 12b, 12c, and the voltage drop of the storage batteries 12a, 12b, 12c at that time is measured by the voltage measuring devices 16a, 16b, 16c. Respectively, and from the constant current AC power supply 15b to the storage batteries 12d, 1
A constant current AC is supplied to 2e and 12f, and the voltage drop of the storage batteries 12d, 12e, and 12f at that time is measured by the voltage measuring devices 16d, 16e, and 16f, respectively. The current measuring device 13 measures that the constant current alternating current from the constant current alternating current power supply 15b is shunted to the charger 11 and the load 14.

The value obtained by subtracting the current value measured by the current measuring device 13 from the constant current value from the constant current AC power supply 15a is taken as the current value flowing through the storage batteries 12a-12c, and measured by the voltage measuring devices 16a-16c, respectively. By dividing the voltage value by this current value, each storage battery 12a, 12b, 12c
Find the internal resistance of.

A value obtained by subtracting the current value measured by the current measuring device 3 from the constant current value from the constant current AC power supply 15b is taken as the current value flowing through the storage batteries 12d to 12f, and measured by the voltage measuring devices 16d to 16f, respectively. By dividing the voltage drop value by this current value, each storage battery 12d, 12e, 12f
Find the internal resistance of.

Since the current flowing through the current measuring device 13 contains various components, this current measuring device 13 has only the current component of the same frequency and the same phase as the constant current AC from the constant current AC power supplies 15a and 15b. I am trying to measure.

Further, the current from the charger 11 flows through each of the storage batteries 12a to 12f, and this current includes the ripple component of the charger. Therefore, the constant current AC power supply 15
The frequency component of the constant current AC from a and 15b is the charger 11
A frequency component different from the ripple frequency component is used to prevent measurement errors due to this.

In this way, the internal resistance of each of the storage batteries 12a to 12f can be accurately measured without disconnecting the storage batteries 12a to 12f from the device.

In addition, the storage batteries 12a to 12c are grouped into one of the six storage batteries 12a to 12f, and the storage batteries 12d to 12f are grouped in another group, and the constant current AC power supplies 15a and 15b supply constant current to each group. Since alternating current is supplied, it is not necessary to connect or disconnect a constant current alternating current power source to or from the storage battery. Further, since the voltage measuring devices 16a to 16f are individually connected to the storage batteries 12a to 12f, it is not necessary to connect or disconnect the voltage measuring devices to or from the storage batteries.

Therefore, the measurement work is further simplified, and the measurement can be easily performed at shorter intervals. In this way, by knowing the internal resistance, the life of each storage battery 12a to 12f can be known, and each storage battery can be replaced at an appropriate timing.

(Third Embodiment) As shown in FIG.
The charger 21 includes a plurality of, for example, four storage batteries 22a, 2
A storage battery circuit in which 2b, 22c, 22d are connected in series is connected in parallel via a current measuring device 23 in series, and a load 24 is connected in parallel. The number of storage batteries to be connected is not limited to four.

The storage batteries 22a and 22b are set as one group, the storage batteries 22c and 22d are set as another group, and the positive terminal of the storage battery 22a is connected to the constant current AC power supply 25 through the first changeover switch 27. The connection point between the storage battery 22b and the storage battery 22c is connected to one end, is connected to one end of the constant current AC power supply 25 via the first contact 28a of the second changeover switch 28, and is connected to the second changeover switch 28. Is connected to the other end of the constant current AC power supply 25 via the second contact 28b of the storage battery 22d, and the negative terminal of the storage battery 22d is connected to the other end of the constant current AC power supply 25 via the third changeover switch 29. ing.

Voltage measuring devices 26a, 26b, 26c, 2 are provided between both ends of each of the storage batteries 22a-22d, respectively.
6d is connected to measure the voltage drop of each storage battery when a constant current AC is supplied to each of the storage batteries 22a to 22d.

This device always operates from the charger 21 to the battery 2
A constant voltage is applied to 2a to 22d, and a current is passed through the load 24 with it.

In this state, the first changeover switch 27 is turned on, the first contact 28a of the second changeover switch 28 is turned off, the second contact 28b is turned on, and the third changeover switch 2 is turned on.
9 is turned off and constant current AC is supplied from the constant current AC power supply 25. At this time, the constant current AC from the constant current AC power supply 25 flows in the series circuit of the storage batteries 22a and 22b. The voltage drop of the storage batteries 22a and 22b at that time is measured by the voltage measuring device 26.
a and 26b. The current measuring device 23 measures that the constant current AC from the constant current AC power supply 25 is shunted to the charger 21 and the load 24.

The value obtained by subtracting the current value measured by the current measuring device 23 from the constant current value from the constant current AC power supply 25 is taken as the current value flowing through the storage batteries 22a, 22b, and the voltage measured by the voltage measuring devices 26a, 26b. The internal resistance of each of the storage batteries 22a and 22b is obtained by dividing the value by this current value.

Next, the first changeover switch 27 is turned off, and the first contact 28a of the second changeover switch 28 is turned on.
The second contact 28b is turned off and the third changeover switch 29 is turned on to supply constant current AC from the constant current AC power supply 25. At this time, the constant current AC from the constant current AC power supply 25 flows in the series circuit of the storage batteries 22c and 22d. The voltage drop of the storage batteries 22c, 22d at that time is measured by the voltage measuring device 26c,
Each is measured at 26d. In addition, the constant current AC power supply 25
The current measuring device 23 measures the shunt of the constant current AC from the shunt to the charger 21 and the load 24.

The value obtained by subtracting the current value measured by the current measuring device 23 from the constant current value from the constant current AC power supply 25 is taken as the current value flowing in the storage batteries 22c, 22d, and the voltage measured by the voltage measuring devices 26c, 26d. The internal resistance of each of the storage batteries 22c and 22d is obtained by dividing the value by this current value.

Since the current flowing through the current measuring device 23 contains various components, the current measuring device 23 measures only the current component having the same frequency and the same phase as the constant current AC from the constant current AC power supply 25. I am trying to do it.

Further, the current from the charger 21 flows through each of the storage batteries 22a to 22d, and this current includes the ripple of the charger. Therefore, the constant current AC power supply 25
The frequency component of the constant current AC from is a frequency component different from the frequency component of the ripple of the charger 21 to prevent measurement error due to this.

In this way, the internal resistance of each of the storage batteries 22a to 22d can be accurately measured without disconnecting the storage batteries 22a to 22d from the device.

Further, the four storage batteries 22a to 22d are grouped into the storage batteries 22a and 22b, the storage batteries 22c and 22d into another group, and the one constant current AC power supply 25 to the changeover switches 27 and 28. , 29, the constant current alternating current is selectively supplied to each group, so that the work of connecting or disconnecting the constant current alternating current power source to the storage battery becomes unnecessary. Moreover,
Only one constant-current AC power supply needs to be used, which can reduce the number of expensive constant-current AC power supplies to be used and improve the economical efficiency.

Further, since the voltage measuring devices 26a to 26d are individually connected to the storage batteries 22a to 22d, it is not necessary to connect or disconnect the voltage measuring devices to or from the storage batteries.

Therefore, the measurement work is further simplified, and the measurement can be easily performed at shorter intervals. Thus, by knowing the internal resistance, the life of each storage battery 22a to 22d can be known, and each storage battery can be replaced at an appropriate timing.

In the above embodiment, an example in which the battery is divided into three batteries has been described. However, the number of batteries may be three or more, and the same operation is performed even if the number of groups is three or more. can do.

[0047]

As described in detail above, according to the present invention,
The internal resistance of a plurality of storage batteries connected to the charger and the load can be measured in a used state without disconnecting the storage batteries, and moreover, accurate measurement can be performed. Further, according to the present invention, it is not necessary to change the connection between the constant current AC power supply and the voltage measuring device, and the measurement work can be further simplified. Further, according to the present invention, the constant current AC power source to be used can be further reduced, and the economical efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a circuit configuration diagram showing a third embodiment of the present invention.

[Explanation of symbols]

1 ... Charger 2a, 2b, 2c ... Storage battery 3 ... Current measuring device 4 ... load 5 ... Constant current AC power supply 6 ... Voltage measuring device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kiyoshi Takahashi             597 Uehara, Izawa, Imaichi, Tochigi Prefecture Furukawa Battery Co., Ltd.             Ceremony company Imaichi office (72) Inventor Toshihiko Hoshi             2-4 Hoshikawa, Hodogaya-ku, Yokohama-shi, Kanagawa             No. 1 inside Furukawa Battery Co., Ltd. (72) Inventor Yuichi Watakabe             597 Uehara, Izawa, Imaichi, Tochigi Prefecture Furukawa Battery Co., Ltd.             Ceremony company Imaichi office (72) Inventor Isao Ichihara             7-6 Tsukisamu Chuodori, Toyohira-ku, Sapporo-shi, Hokkaido             No. 20 JA Tsukikan Central Building Docomo Engineering             Alling Hokkaido Co., Ltd. F-term (reference) 2G016 CB06 CC01 CC02 CC12 CC23                       CD03                 5H030 AA06 AS20 FF42 FF43 FF44

Claims (3)

[Claims] 1. A storage battery circuit in which a plurality of storage batteries are connected in series and each connected to a charger and a load, a current measuring device inserted in series in the storage battery circuit, and each of the storage batteries is individually connected. A constant current AC power supply that supplies constant current AC,
Provided with a voltage measuring device for measuring the drop voltage of the storage battery supplied with constant current alternating current from this constant current alternating current power supply, the current value of the constant current alternating current power supply and the current value measured by the current measuring device and the voltage measuring device. An internal resistance measuring device for a storage battery, which measures the internal resistance of the storage battery to be measured from the measured voltage value. 2. A plurality of storage batteries connected in series and connected to a charger and a load, a current measuring device inserted in series with the storage battery circuit, and a plurality of each storage battery. Divide into groups, and measure the constant voltage AC power supply that supplies constant current AC to the series circuit of the storage battery of each group and the drop voltage of each storage battery that supplies constant current AC from each constant current AC power supply. A plurality of voltage measuring devices are provided to measure the internal resistance of each storage battery from the current value of each constant current AC power supply, the current value measured by the current measuring device, and the voltage value measured by each voltage measuring device. A storage battery internal resistance measuring device characterized by: 3. A plurality of storage batteries, wherein a plurality of storage batteries are connected in series and are respectively connected to a charger and a load, a current measuring device inserted in series in the storage battery circuit, and a plurality of each storage battery. A constant current AC power supply that supplies a constant current AC selectively through a changeover switch to the series circuit of the storage batteries of each group, and an individual storage battery that supplies the constant current AC from this constant current AC power supply. Provided with a plurality of voltage measuring device to measure the voltage drop, the current value of the constant current AC power supply and the current value measured by the current measuring device and the voltage value measured by each of the voltage measuring device of the individual storage battery A storage battery internal resistance measuring device characterized by measuring internal resistance.