JP6741448B2 - Power storage device measurement device - Google Patents

Description

The present invention relates to a measurement device of a power storage device including a plurality of storage batteries, and more particularly, to a technique for measuring the internal resistance of each battery.

Generally speaking, the deterioration state of a storage battery (including a primary battery and a secondary battery) can be determined by its internal resistance (equivalent series resistance) and its DC voltage across its terminals. That is, as the deterioration progresses, the internal resistance increases, while the DC voltage between the terminals tends to decrease.

Patent Document 1 proposes a battery measuring device by an AC 4-terminal method capable of simultaneously measuring the internal resistance of a storage battery and the DC voltage between terminals by one operation, and its configuration is schematically shown in FIG. Explained.

This battery measuring device is generated between an AC constant current source 10 for applying an AC signal for measurement to a battery BT which is an element to be measured via a coupling capacitor 11 and a terminal of the battery BT when the AC current is applied. In addition to the internal resistance detection unit (AC voltmeter) 20 that includes the detection circuit 26 that detects the AC voltage that is generated via the coupling capacitors 23 and 24, the voltage detection unit (DC voltmeter) that detects the DC voltage between the terminals of the battery BT. )30, the CPU (control unit) 52 determines the deterioration state of the battery BT based on the detected internal resistance and inter-terminal DC voltage.

In either case of the AC four-terminal method or the DC four-terminal method, two pairs of probes each having two conductors as a pair are usually used, and one conductor of each pair of probes is used. The voltage detection side is connected to the voltmeter and the other conductor is connected to the measurement signal source as the current supply side. One voltage detection side conductor is shared by the AC voltmeter and the DC voltmeter.The AC voltmeter is connected to the voltage detection side conductor via a coupling capacitor, and the DC voltmeter is directly connected to the voltage detection side conductor. (See FIG. 9).

As described above, according to the battery measuring device described in Patent Document 1, the internal resistance of the battery BT and the DC voltage between the terminals can be simultaneously measured by one operation, and even the deterioration determination can be performed based on these measured values. It can be carried out.

However, in an actual power storage device (storage battery equipment) or the like, as illustrated in FIG. 10, a plurality of storage batteries are confined and connected in series and parallel, so when measuring the internal resistance of each storage battery, etc. Contacting two pairs of probes for each storage battery is a complicated task.

JP, 9-281202, A

Therefore, an object of the present invention is, in a power storage device including a plurality of storage batteries, in measuring the internal resistance of each storage battery, facilitates probing work to each storage battery, and also determines the DC voltage of the entire storage device. To be able to measure.

In order to solve the above problems, the present invention provides a power storage device that measures a power storage device including a storage battery group in which a plurality of storage batteries are connected in series ,
Includes an alternating current source having a current supply probe one pair, and the AC voltmeter having a pair of first voltage detection probe, a DC voltmeter having a pair of second voltage detection probe, one output electrode of the battery group The current supply probe and the second voltage detection probe are respectively brought into contact with the other output electrode, and an alternating current for measurement is supplied from the alternating current source to the storage battery group, and the direct current voltmeter is provided. While measuring the DC voltage of the entire storage battery group, the first voltage detection probe is sequentially and alternately contacted with the terminals of the individual storage batteries in the storage battery group, to measure the internal resistance of each storage battery,
As the probe support means, at least one output electrode of the storage battery group and the other output electrode, has a guide rail for probe movement arranged above the storage battery group, the current supply probe on the guide rail, the The first voltage detection probe and the second voltage detection probe are movably supported.

According to a preferred aspect of the measuring device for the power storage device, the probe supporting means includes elevating means for moving the guide rail to an ascending position where the probes are separated from the storage battery group and a descending position where the probes are in contact with the storage battery group. ing.

Further, as a more preferable aspect, the probe supporting means includes a first probe supporting portion that supports two probes of one of the current supply probe and the second voltage detection probe, and both of the other current supply probes. A second probe support part for supporting the two probes of the second voltage detection probe, a third probe support part for independently supporting the one first voltage detection probe, and the other first voltage detection probe. A fourth probe supporting portion that is independently supported is further provided, and each of the first to fourth probe supporting portions is slidably supported by the guide rail.

Further, preferably, the probe supporting means includes probe moving means for individually moving at least the third probe supporting portion and the fourth probe supporting portion along the guide rail.

As the probe moving means, a pinion rack mechanism including rack teeth formed on the guide rail side and a motor-driven pinion gear provided on the probe supporting portion side is preferable.

As another aspect of the probe moving means, the probe moving means comprises two ball screws arranged on the guide rail so as to be parallel to each other along the extending direction of the guide rail, and the third probe support portion is provided on the one side. Alternatively, the fourth probe support portion may be reciprocally driven by the other ball screw.

Further, the probe moving means is composed of a linear motor table having two moving tables provided on the guide rail along the extending direction of the guide rail, and the third probe supporting portion is provided on the one moving table. It may be mounted and the fourth probe support may be mounted on the other moving table.

According to the present invention, the current supply probe for supplying the measurement signal and the second voltage detection probe for detecting the DC voltage are preferably hands-free and are brought into contact with one output electrode and the other output electrode of the storage battery group. Every time, only the first voltage detection probe for detecting the AC voltage needs to be alternately and alternately contacted with the terminals of the individual storage batteries, so that the probing work for the individual storage batteries can be easily performed, and the individual storage batteries can be easily probed. The internal resistance of the storage battery and the DC voltage of the entire power storage device can be measured at the same time, and the number of inspection steps for deterioration of the storage battery can be reduced.

The schematic diagram which shows the structure of the measuring device of the electrical storage apparatus by this invention roughly. The schematic diagram which shows the 1st example of the measuring method by the said measuring device. The schematic diagram which shows the 2nd example of the measuring method by the said measuring device. The schematic diagram which illustrated the probe support means of the said measuring device. Sectional drawing which followed the AA line of FIG. The typical side view which shows an example of the probe moving means with which the said probe support means is provided. FIG. 9 is a schematic plan view showing another example of the probe moving means. The schematic top view which shows another example of the said probe moving means. The block diagram which shows the battery measuring device as a prior art. The schematic diagram which shows an example of the electrical storage apparatus which connects a some storage battery in series and parallel.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 6, but the present invention is not limited to this.

As shown in FIG. 1, the power storage device measurement device according to this embodiment includes, as a basic configuration, an AC current source 100, an AC voltmeter 200, a DC voltmeter 300, and a control unit 400. ..

The alternating current source 100 has a pair of current supply probes 110 and 120, and a coupling capacitor 130 is connected in at least one of the current supply paths.

The AC voltmeter 200 has a pair of first voltage detection probes 210 and 220, and coupling capacitors 231 and 232 are connected in the respective voltage detection paths. The AC voltmeter 200 may include a detection circuit that is synchronized with the phase of the AC current source 100, like the battery measuring device shown in FIG. 9 above. In the following description, the first voltage detection probe may be referred to as "AC voltage detection probe".

The AC four-terminal method is measured by the AC current source 100 and the AC voltmeter 200, but in the present invention, the current supply probes 110 and 120 of the AC current source 100 and the AC voltage detection probe 210 of the AC voltmeter 200, As will be described later, the 220 can be individually moved as individual probes (contacts).

The DC voltmeter 300 also includes a pair of second voltage detection probes 310 and 320, like the AC voltmeter 200. In the following description, the second voltage detection probe may be referred to as “DC voltage detection probe”.

A microcomputer or a CPU (central processing unit) is used for the control unit 400, and preferably has a function corresponding to a digital processing unit provided in the battery measuring device shown in FIG.

The control unit 400 is supplied with measurement voltages from the AC voltmeter 200 and the DC voltmeter 300, respectively, and the AC current source 100 is supplied with information such as the current value and phase of the measurement AC signal.

The control unit 400 performs various calculations based on these pieces of information. As one of them, the voltage v detected by the AC voltmeter 200 and the current value i of the measurement AC signal (measurement signal) are used. , V/i is calculated to calculate the internal resistance r of the storage battery. Further, control unit 400 determines the deterioration state of the storage battery based on the calculated internal resistance value of the storage battery and the like, and displays the result on display unit 410.

Next, a method for measuring the power storage device will be described with reference to FIGS. 2 and 3. The measurement target here is, for example, a storage battery group G in which three storage batteries B1, B2, B3 are connected in series, and output electrodes T1, T2 are drawn out from both ends thereof.

First, one current supply probe 110 of the AC current source 100 and one DC voltage detection probe 310 of the DC voltmeter 300 are connected to the output electrode T1, and the other current supply probe 120 of the AC current source 100 and the DC voltmeter 300 are connected. The other DC voltage detection probe 320 is connected to the output electrode T2, and an AC signal for measurement is applied from the AC current source 100 to the storage battery group G so that the DC voltage of the storage battery group G can be measured by the DC voltmeter 300. To

If the internal resistance of each storage battery B is measured in order, for example, first, as shown in FIG. 2, the AC voltage detection probes 210 and 220 of the AC voltmeter 200 are brought into contact with both ends of the storage battery B1 to measure the internal resistance. The voltage generated in the storage battery B1 is measured by the AC signal for use in the battery, and the internal resistance r1 of the storage battery B1 is calculated from the current value i of the AC signal and the measured voltage v.

When the measurement of the internal resistance of the storage battery B1 is completed, as shown in FIG. 3, the AC voltage detection probes 210 and 220 of the AC voltmeter 200 are brought into contact with both ends of the next storage battery B2, and the storage battery B2 is charged in the same manner as above. The internal resistance r2 is calculated. This operation is also performed on the storage battery B3 to calculate its internal resistance r3.

Since the current supply probes 110 and 120 and the DC voltage detection probes 310 and 320 are continuously connected to the output electrodes T1 and T2 during the internal resistance measurement of the storage battery B, a hands-free type such as a clip type, a screw type, or a clamp type. It is preferably a probe.

As described above, according to the present invention, when measuring the internal resistance r of each storage battery B, only the AC voltage detection probes 210 and 220 of the AC voltmeter 200 need to be moved, so that workability is good and reliable. Probing can be done easily.

In addition, it is possible to reduce the frequency of probe replacement. Further, since the internal resistance of each storage battery B and the DC voltage of the entire power storage device can be measured at the same time, the number of inspection steps for deterioration of the storage battery can be reduced.

Next, with reference to FIG. 4 to FIG. 6, a preferable probe supporting means for efficiently performing the above internal resistance measuring operation will be described. It should be noted that the storage battery group G in FIG. 4 includes n storage batteries B1 to Bn connected in series in a straight, single-row state by a plurality of short-circuit plates S. Let be X. The output electrodes T1 and T2 are electrode lead plates.

The probe supporting means includes a guide rail 510 arranged above the storage battery group G and in parallel with the installation surface X of the storage battery group G. The guide rail 510 has a length equal to or longer than the distance between the output electrodes T1 and T2. In this embodiment, the guide rail 510 is an elevating means on the base frame 500 whose both ends form the skeleton of the probe supporting means. It is supported via an air cylinder 540. A hydraulic cylinder, a feed screw shaft, or the like may be used as the lifting means instead of the air cylinder.

Four guide support portions 521, 522, 531 and 532 are slidably attached to the guide rail 510. Of these, the probe supporting portions 521 and 522 are for supporting two, and the probe supporting portions 531 and 532 are for supporting one.

That is, the probe support portion 521 supports two probes, that is, one current supply probe 110 of the alternating current source 100 and one direct current voltage detection probe 310 of the direct current voltmeter 300. Similarly, the probe support portion 522 has an alternating current Two probes, that is, the other current supply probe 120 of the current source 100 and the other DC voltage detection probe 320 of the DC voltmeter 300 are supported.

On the other hand, the probe support portion 531 supports one of the AC voltage detection probes 210 of the AC voltmeter 200, and the probe support portion 532 includes the other AC voltage detection probe 220 of the AC voltmeter 200. Supported.

The probe support portions 521 and 522 and the probe support portions 531 and 532 have basically the same configuration except for the number of probes to be supported, and as a representative example thereof, FIG. 5 shows a cross section of the probe support portion 531.

The probe support portion 531 is made of an electrically insulating material such as synthetic resin, and includes a box-shaped sliding body 530 that slides along the guide rail 510. The AC voltage detection probe 210 is vertically slidably inserted into the bottom of the sliding body 530.

The AC voltage detection probe 210 has a head 210a as a retaining member, and a compression coil spring C that contacts the head 210a and always urges the AC voltage detection probe 210 downward in the sliding body 530. It is stored.

The AC voltage detection probe 210 is connected to the AC ammeter 200 via a lead wire including a compression coil spring C and a coupling capacitor 231. The other probe supporting portions 521, 532, and 522 have substantially the same configuration.

On the guide rail 510, the probe support parts 521 and 522 are arranged on both sides, and the probe support parts 531 and 532 are arranged between them. For example, in order to measure the internal resistance r2 of the storage battery B2, a raising command is given to the air cylinder 540 to raise the guide rail 510 to a height position where each probe is separated from the battery group G.

Then, by manually moving the probe supporting portions 521, 531, 532, 522, one of the current supply probe 110 and the DC voltage detection probe 310 is placed on the electrode plate of the output electrode T1, and the AC voltage detection probes 210 and 220 are stored in the storage battery. On the short-circuit plates S, S on both sides of B2, the other current supply probe 120 and the DC voltage detection probe 320 are positioned on the electrode plate of the output electrode T2.

Thereafter, a downward command is given to the air cylinder 540 to lower the guide rail 510 to output the probes 110 and 310 to the output electrode T1, the probes 210 and 220 to the short-circuit plates S and S of the storage battery B2, and the probes 320 and 120. The electrodes T2 are brought into contact with each other, a measurement current is supplied from the AC current source 100 to the battery group G, the terminal voltage of the storage battery B2 is measured by the AC voltmeter 200, and the storage battery B2 is calculated from the measurement current i and the terminal voltage v. The internal resistance r2 is calculated, and the voltage of the battery group G itself is measured by the DC voltmeter 300.

Next, for example, in order to measure the internal resistance r3 of the adjacent storage battery B3, similarly to the above, the guide rail 510 is raised to a predetermined height, and the positions of the probe support portions 521 and 522 on both sides are left as they are. After moving the parts 531 and 532 to the right by one storage battery in FIG. 4, the guide rail 510 may be lowered.

In order to automatically move the probe supporting portions 531 and 532 and measure the internal resistance r of each storage battery B, as shown in FIG. 6, the rack teeth 511 are formed on the guide rail 510 and the probe supporting portion 531 is formed. , 532 side are provided with pinion gears 512 which are driven by a motor (not shown) and mesh with the rack teeth 511.

Then, the control unit 400 (see FIG. 1) gives a drive control signal to the motor for driving the pinion and the air cylinder 540 for raising and lowering the guide rail, and raises the guide rail 510→the probe support portions 531 and 532. It suffices to perform the steps of moving, descending the guide rail 510, supplying a measurement current and measuring an AC voltage, and ascending the guide rail 510.

The above-mentioned pinion rack mechanism can also be applied to the probe supporting portions 521 and 522 on both sides to move them automatically. Further, instead of the pinion/rack mechanism, a ball screw including a screw shaft, a nut, a ball, or the like, or a linear moving mechanism using a linear motor table may be applied.

In the case of using the ball screw, as shown in FIG. 7, two ball screws 611 and 612 are installed on the guide rail 510 along the extending direction so as to be parallel to each other. The probe support 531 having the voltage detection probe 210 may be reciprocally driven, and the other ball screw 612 may reciprocally drive the probe support 532 having the AC voltage detection probe 220.

Further, in the case of using a linear motor table, as shown in FIG. 8, a twin table type linear motor table, that is, a linear motor table 620 having two moving tables 621 and 622 along the extending direction of the guide rail 510 is used. The probe support portion 531 having the AC voltage detection probe 210 may be mounted on one of the moving tables 621, and the probe support portion 532 having the AC voltage detection probe 220 may be mounted on the other moving table 622.

100 AC current source 110, 120 Current supply probe 200 AC voltmeter 201, 220 1st voltage detection probe (AC voltage detection probe)
300 DC voltmeter 310, 320 Second voltage detection probe (DC voltage detection probe)
400 Control Unit 500 Base Frame of Probe Supporting Unit 510 Guide Rail 521, 522, 531, 532 Probe Supporting Unit 540 Air Cylinder (Elevating Unit)
611,612 Ball screw 620 Linear motor table 621,622 Moving table B (B1 to Bn) Storage battery S Short circuit plate T1, T2 Output electrode

Claims (7)

In a measuring device for a power storage device that measures a power storage device including a storage battery group in which a plurality of storage batteries are connected in series,
An AC current source having a pair of current supply probes, an AC voltmeter having a pair of first voltage detection probes, and a DC voltmeter having a pair of second voltage detection probes,
The one output electrode and the other output electrode of the storage battery group are brought into contact with the current supply probe and the second voltage detection probe, respectively, and the alternating current source supplies the alternating current for measurement to the storage battery group. And measuring the DC voltage of the entire storage battery group with the DC voltmeter, the first voltage detection probe is sequentially and alternately contacted with the terminals of the individual storage batteries in the storage battery group, and the individual storage batteries are When measuring the internal resistance of
As the probe support means, at least one output electrode of the storage battery group and the other output electrode, has a guide rail for probe movement arranged above the storage battery group, the current supply probe on the guide rail, the A measuring device for a power storage device, wherein the first voltage detection probe and the second voltage detection probe are movably supported. The probe support means according to claim 1, characterized in that the guide rails each probe provided with a lifting means for moving to the lowered position in contact with the raised position and the storage battery group away from the storage battery group Power storage device measuring device. The probe support means includes a first probe support portion that supports two probes of the current supply probe and the second voltage detection probe on one side, and a current supply probe and a second voltage detection probe of the other on the other side. A second probe support portion that supports two probes, a third probe support portion that independently supports the one first voltage detection probe, and a fourth probe that individually supports the other first voltage detection probe. The power storage device measuring apparatus according to claim 1 or 2 , further comprising a support portion, wherein each of the first to fourth probe support portions is slidably supported by the guide rail. The electricity storage device according to claim 3 , wherein the probe supporting means includes probe moving means for individually moving at least the third probe supporting portion and the fourth probe supporting portion along the guide rail. Measuring device of equipment. The measurement of the power storage device according to claim 4 , wherein the probe moving means includes rack teeth formed on the guide rail side and a motor-driven pinion gear provided on the probe supporting portion side. apparatus. The probe moving means is composed of two ball screws arranged on the guide rail so as to be parallel to each other along the extending direction of the guide rail, and the third probe support portion is formed by the one ball screw. The device for measuring a power storage device according to claim 4 , wherein the device is reciprocally driven, and the fourth probe support part is reciprocally driven by the other ball screw. The probe moving means comprises a linear motor table having two moving tables provided on the guide rail along the extending direction of the guide rail, and the one moving table is provided with the third probe support portion. The measuring device for a power storage device according to claim 4 , wherein the fourth probe support portion is mounted on the other moving table.

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