JP3076511B2 - Battery insulation test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery insulation test apparatus, and more particularly to a battery insulation test apparatus capable of performing an insulation test within a short time and having a function of repairing an internal short-circuited portion of a battery under test. About.

[0002]

2. Description of the Related Art An electromotive section formed by spirally winding a laminate of a positive electrode sheet (plate), an insulator sheet (plate), a negative electrode sheet (plate), and an insulator sheet (plate) is placed inside an outer container. Nickel-metal hydride batteries or nickel cadmium batteries sealed in a liquid-tight manner are widely used in practice. By the way, in the configuration of the battery, after inserting and arranging an electromotive portion in an outer container, an electrical insulation test and evaluation between a spirally wound positive electrode sheet and a negative electrode sheet are performed. . That is, in order to maintain the reliability and high quality of the battery cell product, a test / evaluation is performed in advance on the insulation state between the two electrode sheets or the presence / absence of a short circuit in the electromotive section.

Conventionally, the quality of insulation between the two electrode sheets is determined by:
Generally, as shown in the circuit configuration of FIG. 5, a control device 3 for controlling an automatic load / unload mechanism or the like incorporating a general-purpose insulation meter 2 having an external connection terminal 1 and a battery under test ( The determination is made in combination with a device having an automatic connection mechanism for the terminal 4a of the battery cell 4 under test.

[0004]

However, in the case of the conventional insulation test / evaluation means between the two electrode sheets,
The following inconveniences are recognized. First, for example, it is practically very difficult to always keep the contact piece to the terminal of the battery cell under test clean at all times and to stably secure the required electrical connection (contact). Can be In other words, regardless of whether insulation is good or not, it may be determined that everything is good, and there is a problem in reliability.

Second, since the capacitance between the two electrode sheets is relatively large (for example, several hundred PF or more), a charging current flows after the measurement DC voltage is applied. Evaluation), it takes a relatively long time to judge whether the insulation resistance is good or not, and the speed up of the insulation test is impaired. At the time of completion of the charging, the insulation is judged to be good or bad after the time is up using a timer provided in the insulation meter.

Third, when both electrode sheets are made of metal felt (for example, nickel felt) as a current collector, metal element fibers (diameter of 10 μm or less) projecting (extruding) from the surface are formed on the electrodes. Even if a short circuit has occurred through the insulator sheet inserted between the sheets, it cannot be repaired. In other words, when the electrode sheets are short-circuited due to the protrusion of the metal fiber,
Even if the short circuit can be repaired, it will be rejected as a defective product without considering or responding to the repair, which will affect the yield and the like.

As described above, the conventional battery cell insulation test / evaluation means has problems in terms of reliability of test / evaluation, time required for test / evaluation, repairability of short circuit, and the like. In order to provide mass-produced battery cells with high performance, the development of more efficient or functional insulation test means has been awaited.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a battery insulation test apparatus capable of performing a high-speed and highly reliable insulation test / evaluation between both electrode sheets constituting an electromotive section. For the purpose of providing.

[0009]

According to a first aspect of the present invention, there is provided an input / output control device which is connected to an isolated input / output circuit and controls the entire device, a control circuit which controls input / output of the isolated input / output circuit, A pulse output control circuit for controlling a pulse output by the control circuit;
ff, a DC power supply having a transistor on the positive electrode side, a quick charge detection circuit having one end connected to the transistor on the DC power supply side and the other end connected to the battery under test and a standard capacitor, respectively, and a negative electrode of the DC power supply. One end is connected to the side, and the other end is connected to a contact for the battery under test and a standard capacitance capacitor, respectively, and an output current limiting circuit connected to the rapid charging detection circuit, and a contact for the charging / blown current and the battery under test. A detection circuit for detecting the contact quality of the battery and inputting the result to an insulation input / output circuit; and an insulation circuit for connecting the output current limiting circuit and the quick charge detection circuit to input the insulation test result of the battery under test to the insulation input / output circuit. And an insulation test apparatus for a battery.

That is, according to the present invention, a pulse output is applied to a battery under test to improve the measurement speed and detect the quality of contact (connection) by a rapid charging current, and a short circuit inside the battery under test is energized by the pulse output. The main point is to have the function of repairing by fusing.

FIG. 1 is a block diagram for explaining the outline of the operation of the insulation test apparatus for a battery. First, the battery under test 4 is loaded by the input / output control device 3, and the contact 1 is lowered to connect to the terminal tab 4a of the battery under test 4, while the control circuit 5 starts measurement (measurement or test / evaluation). A signal is output. With the output of the measurement start signal to the control circuit 5, the output of the DC power supply unit 6 is supplied to the battery 4 to be tested through the contact 1 and the terminal tab 4a, and at the same time, the measurement of the insulation meter 2 is started. Is output. Then, at the output of the DC power supply unit 6 for the battery under test 4, a quick charging current flows through the capacitance of the battery under test 4, and a fusing current flows for a short time when there is a short circuit inside the battery under test 4. . By detecting the quick charging current or the fusing current, the control circuit 5 generates a signal indicating the occurrence of a contact failure of the contact 1 or the presence or absence of a fusing current at the time of short circuit. In addition, it is possible to determine whether or not the short-circuited portion inside the battery under test 4 has been blown and repaired, based on the signal of the insulation quality measurement by the insulation meter 2 and the signal of the fusing current.

As described above, by rapidly charging the battery 4 under test, the measurement (insulation test) time is shortened, and the measurement pass / fail signal, the contact pass / fail signal,
By outputting a signal indicating the presence or absence of a fusing current to the input / output control device 3, it is possible to accurately determine whether or not the battery has been subjected to the insulation test and to convey the battery.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2, 3 and 4.

FIG. 2 is a circuit diagram showing an example of the configuration of a main part of an insulation test apparatus for a battery.
An input / output control device for controlling the entire device, a control circuit 5 for controlling the isolated input / output of the isolated input / output circuit 7, and a pulse output control circuit 8 for controlling the pulse output of the control circuit 5 are provided. 6 'is the output of the pulse output control circuit 8.
0n, 0ff a DC power supply having a transistor 9 on the positive electrode side, 10 has one end connected to the transistor 9 on the DC power supply 6 'side, and has the other end connected to the battery 4 to be tested and a standard capacitor.
A quick charge detection circuit 12 is connected to the negative electrode of the DC power supply 6 'at one end, and the other end is connected to the battery 4 under test.
And an output current limiting circuit respectively connected to the contact 1 and the standard capacitance capacitor 11. Here, the quick charge detection circuit 10 includes a circuit for connecting to the battery 4 under test via a resistor 10a for detecting charging and fusing current and a diode 10b, and a resistor 10a 'for standard charging current detection and a diode.
10b 'and a circuit connected to the standard capacitor 11 with the capacitor 10b' interposed therebetween. On the other hand, the output current limiting circuit 12 includes a fusing switch 12c or a current limiting switch 12d,
a ₁ or resistor 12a ₁ ′ and current limit switch 12
d ′, resistance 12a ₂ or resistance 12a ₂ ′ and diode
The contact 1 that contacts the terminal tab 4a of the battery 4 under test through the 12b or 12b 'or a standard capacitor
11 are connected to each other. The capacitance of the standard capacitor 11 has a value substantially equal to the capacitance of the battery 2 under test.

Further, a detecting circuit 13 is connected to the rapid charging detecting circuit 10 to detect a charging / fusing current and the quality of contact of the contact 1 with the battery 4 to be tested, and to input the detected signal to the isolated input / output circuit 7. Is an insulation meter connected to the battery 4 under test and the contact 1 via diodes 14a and 14b, respectively, and inputs the insulation test result of the battery 4 under test to the insulation input / output circuit 7. The diodes 10b and 12b prevent the measurement DC signal of the insulation meter 2 from being applied to the insulation input / output circuit 7, and the diodes 14a and 14b use the insulation meter to apply the quick charge voltage to the battery 4 under test. 2 is prevented. The diodes 15a and 15b prevent excessive input to the charging / fusing current detection amplifier of the detection circuit 13 when a fusing current detection voltage generated across the charging or fusing current detection resistor 10a is large. In FIG. 2, a circuit section surrounded by a dashed line corresponds to the control circuit 5 and the DC power supply section 6 in FIG.

Next, the operation of the insulation test apparatus for a battery having the above configuration will be described.

First, when a measurement reset signal and a start signal are input from the input / output control device 3 to the isolated input / output circuit 7, they are output from the isolated input / output circuit 7 to the control circuit 5 as isolated input signals. Here, the isolated input signal input to the control circuit 5 is output to the detection circuit 13 and the pulse output control circuit 8, and the pulse output control circuit 8 outputs a required pulse and outputs The transistor 9 connected to the positive electrode side of 6 'is driven to output a required DC input to the battery 4 under test. Here, when the transistor 9 is turned on, the quick charge detection circuit 10 side
Charge or fusing current detection resistor 10a and diode
A charging current is supplied to the battery 4 (outer can) via 10b and to a standard capacitor 11 via a standard charging current detecting resistor 10a 'and a diode 10b'.

The charging or fusing current detecting resistor 10a and the standard charging current detecting resistor 1 of the quick charge detecting circuit 10
From 0a ', a voltage having a waveform as schematically shown in FIG. 3 is output. That is, when the resistors 10a and 10a 'have the same resistance value, when the voltage waveform shown in FIG. 3A is applied from the transistor 9, the charging current waveform of the standard capacitor 11 and the battery 4 under test becomes Although the waveforms are the same as shown in FIGS. 3B and 3C, the fusing current waveform of the battery 4 under test is different as shown in FIG. 3D. The fusing currents having different waveforms are noise-removed by the charging / fusing current detection amplifier of the detection circuit 13 and amplified to determine the presence / absence of the fusing current in the fusing current detection circuit. The quality of the contact is detected, a signal of the quality of the contact is generated, and the signal is output to the input / output control device 3 via the isolated input / output circuit 7 as an isolated output signal.

FIG. 4 shows an example of a fusing current detecting circuit for detecting the presence or absence of the fusing current. When the charging current waveform of the standard capacitor 11 is input to the differential input a and the battery charging waveform is input to the differential input b, Since both waveforms are almost equal and the difference output between the differential input a and the differential input b is small, there is no output to the comparator. However, if there is a short circuit inside the battery 4 to be tested, the difference between the waveform of FIG. 3D and the waveform of FIG. 3B (fusing current waveform—standard capacitor 11 charging current waveform) is equal to the output. As a result, a signal indicating the fusing current is output to the comparator.

Further, the quality of the contact is determined by the presence or absence of the battery charging current waveform shown in FIG. That is, when the contact 1 is connected to the terminal tab 4 a of the battery under test 4, the contact detection circuit of the detection circuit 13 outputs a signal of good contact generated by the charging current to the control circuit 5. Here, the control circuit 5 receives the contact good signal of the contact 1, and after a lapse of time required for quick charging or fusing (for example, 200 μs).
), The transistor 9 is turned off via the drive circuit section of the pulse output control circuit 8. The contact 1 and the battery 4 under test 4
When a good contact signal is not output to the control circuit 5 due to poor connection with the terminal tab 4a, the control circuit 5 turns off the transistor 9 after the lapse of an allowable time (for example, 0.4 sec).
Then, a signal of the contact failure is output from the isolated input / output circuit 7 to the input / output control device 3 as an isolated signal, and the result is displayed to complete a series of operations.

On the other hand, on the output current limiting circuit 12 side, the connection with the terminal tab 4a of the battery 4 under test is switched by the insulation test voltage. For example, when the insulation test voltage is 500 v, current limiting switch 12d- resistor 12a ₁ - the current limiting switch 12d'- resistor 12a ₂ system, also, the current limiting switch 12d- resistor 12a ₁ when the 250 V '- Current Limit switch
The current a constant value by switching to 12d'- resistor 12a ₂ 'system, via a diode 12b and contact 1, connected to a terminal tab 4a of the test battery 4. The fusing switch 12c
When on is turned on, the resistors 12a ₁ and 12a ₁ ′ do not work, so the current that can be blown is at most about 8 A.
a ₂ , 12a ₂ ′. Also, the fusing switch 12c is off, current of about 50mA flows most (fast rechargeable) as resistor 12a _1, 12a ₁ 'is set.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention.

[0023]

As can be seen from the above description of the embodiment, according to the present invention, a stable state can be ensured quickly by rapid charging with respect to the capacitance of the electromotive section, and a required insulation test is performed.・ Since the measurement is performed, the time required for the test and evaluation of the insulation property can be significantly reduced. In addition, the quality of the contact between the battery under test and the contact is also detected by the presence or absence of the quick charging current, so that the reliability of the test and evaluation of the insulating property is also improved. In addition, even if there is a short-circuited portion inside the battery under test due to the exudation of the fiber, it can be easily repaired by fusing current, making it practical for use as a battery. Can also be achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically illustrating a basic operation of a battery insulation test apparatus according to the present invention.

FIG. 2 is a circuit block diagram showing a configuration example of a main part of a battery insulation test apparatus according to the present invention.

3A and 3B show output waveforms of the battery insulation test device shown in FIG. 2, wherein FIG. 3A shows an output voltage waveform diagram of a transistor, FIG. 3B shows a charging current waveform diagram for a standard capacitor, and FIG. FIG. 4 is a waveform diagram of a charging current for a battery under test, and FIG.

FIG. 4 is a circuit diagram showing an example of a fusing current detection circuit in a detection circuit of the insulation test apparatus for a battery shown in FIG. 3;

FIG. 5 is a circuit block diagram showing a configuration example of a main part of a conventional battery insulation test apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Contact 2 ... Insulation meter 3 ... Input / output control device 4 ... Battery under test 4a ... Terminal tab of battery under test 5 ... Control circuit 6 ... DC power supply unit 6 '... DC power supply 7 ... Isolated input / output circuit 8 ... Pulse output control circuit 9 ... Transistor 10 ... Quick charge detection circuit 10a ... Current detection resistor 10a '... Standard charging current detection resistor 10b, 10b', 12b, 12b ', 14a , 14b, 15a, 15b
... diode 11 ...... standard capacity capacitor 12 ...... output current limiting circuit _{12a 1, 12a 1 ', 12b} 2, 12b 2' ... resistor 12c ...... blown switch 12d, 12d '... current limiting switch 13 ...... detecting circuit (charging・ Detection of fusing current and contact quality of contact

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01M 10/48 H01G 4/14-4/42 G01R 31/12

Claims (1)

(57) [Claims] 1. An input / output control device connected to an isolated input / output circuit to control the entire apparatus, a control circuit to control input / output of the isolated input / output circuit, and a pulse output control to control a pulse output by the control circuit A DC power supply provided on the positive electrode side with a transistor that performs 0n and 0ff on the output of the pulse output control circuit; one end connected to the transistor on the DC power supply side, and the other end connected to the battery under test and the standard capacitor, respectively. A fast-charge detection circuit connected thereto; an output current limiting circuit having one end connected to the negative electrode side of the DC power supply, and the other end connected to a contact for a battery under test and a standard capacitance capacitor, respectively; A detection circuit for detecting the charging / fusing current and the quality of contact of the contact with the battery under test and inputting the detected current to an isolated input / output circuit; Battery insulation test apparatus characterized by comprising an insulating meter connected to the circuit and the rapid charging detecting circuit inputs an insulating test results of the test battery in the insulation input circuit.