JPH0783822A - Weld strength measuring apparatus - Google Patents

Abstract

PURPOSE:To enable the weld strength of work to be surely measured with good reproducibility. CONSTITUTION:A weld-strength measuring apparatus 3 comprises a structural portion 5 and a control portion, and the structural portion 5 comprises a work holder 57 in which an explosion-proof valve device 17 is set, an outer cylinder 53, an inner cylinder 55, a probe holder 5505, and a work holder 59 to be electrically connected to the bottom surface 1713 or projecting portion 1719 of the explosion-proof valve 1701, with a pressure-oil passage communicating with the space portion 1723 of the explosion-proof valve device 17 and formed in the outer cylinder 53, the inner cylinder 55 and the probe holder 5505, and a disk 1703 welded to the projecting portion 1715 is electrically connected to the outer cylinder 53, and the hydraulic pressure of pressure oil is detected by a pressure sensor 7 and the electrical connection between the outer cylinder 53 and the work holder 59 is detected by a conduction sensor 8, and the control portion comprises a pressure-oil feeder unit for feeding and regulating the pressure oil to the passage, a pressure gauge for detecting and outputting the hydraulic pressure at the moment when the electrical connection between the projecting portion 171 5 and the disk 1703 is interrupted according to the detection results of the pressure sensor 7 and the conduction sensor 8, and a control unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding strength measuring device for measuring the welding strength of, for example, an explosion-proof valve device for an explosion-proof sealed secondary battery.

[0002]

2. Description of the Related Art Secondary batteries, such as lithium batteries and carbon lithium batteries, which are widely used in video tape recorders, watches and the like, include a positive electrode material, a negative electrode material and an electrolytic solution impregnated between them. The power generation element including the separated separator is housed in an outer can that also functions as a negative electrode terminal, and the upper opening of the outer can is sealed by a closing lid that also functions as a positive electrode terminal. In this type of secondary battery, when the internal power generation element is brought into an overcurrent state due to overcharging or the like, there is a possibility that the electrolytic solution of the separator causes a chemical change, the internal pressure of the outer can rises, and the outer can bursts. Therefore, conventionally, an explosion-proof valve is provided inside the closing lid, the explosion-proof valve being deformed outward and cleaved as the internal pressure of the outer can increases.

However, even if the outer can can be prevented from bursting by opening the explosion-proof valve, if the power generating element is continuously energized and the overcurrent state continues, the electrolyte solution, the positive electrode material and / or the negative electrode material is Due to the decomposition of the active material, the internal temperature of the outer can rises and the secondary battery may ignite. So, in recent years,
For example, as disclosed in Japanese Patent Application Laid-Open No. 2-112151, there is proposed an explosion-proof sealed secondary battery configured so that the power supply to the power generating element is cut off as the internal pressure of the outer can increases. In this secondary battery, the explosion-proof valve is made of a conductive member to electrically connect to the closing lid, a stripper made of a conductive member is arranged inside the explosion-proof valve, and the gas inside the outer can is directed to the explosion-proof valve side. Form a through hole to pass through on the stripper,
Insulating material is placed between the explosion-proof valve and the stripper,
Connect the conductive lead from the positive electrode material to the stripper,
The substantially central portion of the explosion-proof valve and the stripper are welded together through the through hole of the insulating material. Therefore, according to this secondary battery, due to the deformation of the explosion-proof valve to the outside due to the increase in the internal pressure of the outer can, the welding between the explosion-proof valve and the conductive lead is peeled off, and the power supply to the power generation element is cut off. The overcurrent state of the element is eliminated and it is possible to prevent ignition and rupture of the outer can.

In producing such an explosion-proof closed type secondary battery, the explosion-proof valve and the conductive lead are surely peeled off at the moment when the internal pressure of the outer can reaches a desired value. It is desirable to measure the welding strength between the valve and the conductive lead. Then, in the case of measuring such welding strength, the explosion-proof valve in which the conductive leads were welded through the lead-blocking stripper was randomly pulled out from the rechargeable battery assembly line and pulled out. It is desirable to pressurize the explosion-proof valve in the direction of peeling it from the conductive lead and to sample a large number of pressing forces at the moment when the conductive lead is peeled. This measurement work was usually done manually.

[0005]

In the manual measurement work, when the explosion-proof valve is pressurized in the direction of peeling from the conductive lead, the pressure applied to the explosion-proof valve is increased in the same manner as the internal pressure rise of the actual outer can. Although it is necessary to change the pressure, if a hand pump is used to pressurize the explosion-proof valve, the pressure applied to the explosion-proof valve will pulsate every time the pump is operated for one stroke, and the same pattern as the actual rise in internal pressure will occur. There is a problem that the pressure change cannot be reproduced. In addition, in order to measure the welding strength of a large number of explosion-proof valves, it is necessary to apply pressure to each explosion-proof valve in the same pattern to match the measurement conditions. Since the pressurizing pattern of 1 is determined by the method of pump operation, it is extremely difficult to reproduce the same pressurizing pattern. The present invention has been made in view of the above circumstances, and an object of the present invention is to form two conductive members that are separated from each other and partially welded, including the welding strength between the explosion-proof valve and the conductive lead described above. It is an object of the present invention to provide a welding strength measuring device capable of reliably and reproducibly measuring the welding strength of a work in which at least one of the conductive members is deformable by pressure.

[0006]

In order to achieve the above object, the present invention is a device for measuring the welding strength of two works made of a conductive member, wherein the two of the works are made to face the welding part of the works. Holding means for defining a space between the works and holding the two works; fluid supply means for supplying a fluid to the space; control means for increasing / decreasing the fluid pressure of the fluid; A conduction detecting means for detecting a conduction state between two works, a pressure detecting means for detecting the fluid pressure, and a time point when the two works are insulated based on the detection results of the conduction detecting means and the pressure detecting means. And output means for outputting the fluid pressure.

According to the present invention, one of the two works is a member electrically connected to a power generating positive electrode material of the secondary battery, and the other is electrically connected to a positive electrode terminal of the secondary battery. And an explosion-proof valve which is connected to the secondary battery and is deformed in a direction away from the conductive member as the internal pressure of the secondary battery rises. Further, according to the present invention, the explosion-proof valve is configured to be capable of being cleaved by a deformation of a predetermined amount or more, and based on the detection result of the pressure detecting means, when the fluid pressure decreases by a predetermined value or more per unit time. Second output means for outputting the fluid pressure is further provided.

[0008]

According to the present invention, the fluid pressure of the fluid supplied by the fluid supply means is increased by the control means in the space between the two workpieces welded to each other, so that one workpiece is separated from the other workpiece. Pressure is applied in the direction of separation, the welded portions of the two works are separated, and the state between the two changes from the conductive state to the insulating state. When the two works are in an insulated state, the conduction detecting means detects this and the fluid pressure at the time of the insulating state is output by the output means onto the screen or the recording paper. Therefore, for example, one of the two works is a member electrically connected to the power generation positive electrode material of the secondary battery, and the other is electrically connected to the positive electrode terminal of the secondary battery. An explosion-proof valve that is deformed in a direction away from the conductive member as the internal pressure of the secondary battery rises, wherein the welding of the conductive member and the explosion-proof valve is reliably peeled off as the internal pressure of the secondary battery rises. When measuring the welding strength of the materials to check whether or not the power supply to them is cut off, the same pattern as the actual internal pressure rise when the power generating element of the secondary battery is in the overcurrent state is used. It is possible to reproduce the pressure change and pressurize one work with that pattern.
It is possible to measure the welding strength with good reproducibility for a large number of sets of works.

When the explosion-proof valve is constructed so that it can be opened by a deformation of a predetermined amount or more, the fluid pressure of the fluid is increased by the control means even after the welding of the conductive member and the explosion-proof valve is peeled off. The explosion-proof valve is opened to reduce the fluid pressure by a predetermined value or more per unit time, and the fluid pressure detected by the pressure detecting means at this time is output to a screen or recording paper by the second output means. By doing so, similarly to the measurement of the welding strength, the measurement of whether or not the valve member is reliably cleaved with the increase of the internal pressure of the secondary battery can be performed with the same pattern as the actual increase of the internal pressure and with good reproducibility. .

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, a secondary battery provided with an explosion-proof valve device for measuring the welding strength by the welding strength measuring device of the present invention will be described. FIG. 1 is an upper sectional view of a secondary battery provided with an explosion-proof valve device. In the figure, a secondary battery indicated by reference numeral 1 includes an outer can 11, a closing lid 13 that closes an opening 1101 in the upper part of the outer can 11, and also serves as a positive electrode terminal of the secondary battery 11, and an opening 1101 of the outer can 11. A gasket 15 for closing a gap between the inner peripheral edge and the outer peripheral edge of the closure lid 13 is provided. A power generation element (not shown) including a positive electrode material, a negative electrode material, and a separator is housed in the outer can 11, and also serves as a negative electrode terminal of the secondary battery 1. Reference numeral 17 denotes an explosion-proof valve device. The explosion-proof valve device 17 is integrally provided inside the closing lid 13, and the explosion-proof valve device 17 and the positive electrode material are electrically connected by a conductive lead 19.

FIG. 2 is an enlarged sectional view of the explosion-proof valve device 17 before being incorporated in the opening 1101 of the outer can 11. The explosion-proof valve device 17 includes an explosion-proof valve 1701, a disc 1703 (corresponding to a member connected to the positive electrode material), and a storage member 1705 (corresponding to a holding unit) that stores the explosion-proof valve 1701 and the disc 1703. There is. The explosion-proof valve 1701 has a large diameter portion 1707 and a small diameter portion 1709.
And a step portion 1711, and is formed of a conductive member. A convex projection 1715 is formed downward at a substantially central portion of the bottom surface 1713 of the small diameter portion 1709, and a plurality of concave portions 1717 are formed radially on the bottom surface 1713 around the projection 1715. These plural recesses 1
717 allows the bottom surface 1713 to be easily deformed as shown by the dotted line in FIG.

The disk 1703 is formed of a conductive member into a disk shape having substantially the same diameter as the small-diameter portion 1709 of the explosion-proof valve 1701, and a plurality of through holes 1719 are formed on the outer peripheral portion thereof at intervals in the circumferential direction. Formed, the disk 170
The conductive lead 19 is attached to the lower surface of the solder 3 by soldering or the like. The accommodating member 1705 is formed of an insulating member into a cylindrical shape having an inner diameter capable of accommodating the small diameter portion 1709 of the explosion-proof valve 1701 and the disk 1703, and an annular flange 1721 is formed at a substantially intermediate position on the inner peripheral surface thereof. Has been done. Inside the housing member 1705, the small diameter portion 1709 of the explosion-proof valve 1701 is housed on one end side of the flange 1721 and the disc 1703 is housed on the other end side.
The space 1723 is defined between the explosion-proof valve 1701 and the disk 1703 in the housed state, and the explosion-proof valve 1 and the substantially central portion of the upper surface of the disk 1703 are formed.
The protrusion 1715 of 701 is welded, thereby forming the explosion-proof valve device 17, and the welding strength between the protrusion 1715 of the explosion-proof valve 1701 and the disk 1703 is measured by the welding strength measuring device according to the embodiment. It

Next, the welding strength measuring device according to the embodiment will be described. FIG. 3 is a sectional view of a structural portion of the welding strength measuring device. The structure portion 5 of the welding strength measuring device 3 has a base 51.
An outer cylinder 53 erected on the base 51, an inner cylinder 55 fixed inside the outer cylinder 53, and a work holder disposed at the upper end of the outer cylinder 53 and accommodating the explosion-proof valve device 17. 57,
The work holder 59 and the like arranged above the work holder 57 are provided.

The base 51 has a passage 5 through which pressure oil passes.
101 is formed. The outer cylinder 53 is formed of a conductive member, and the flange 5301 at the lower end of the outer cylinder 53 is fixed to the base 51 by bolts 5303. The inner cylinder 55 is fixed to the inside of the outer cylinder 53 by a bolt 5502, and the inner passage 5501 of the inner cylinder 55 has the passage 510.
1, the hydraulic pressure in the internal passage 5501 is detected by the pressure sensor 7 including, for example, a strain gauge type sensor with a built-in amplifier, and a voltage having a value corresponding to the detected hydraulic pressure is amplified by the amplifier. It is output from the pressure sensor 7. In the figure, reference numeral 5503 denotes an O-ring provided between the outer cylinder 53 and the inner cylinder 55.

Further, a disk-shaped probe holder 5505 is held by the upper end of the inner cylinder 55 and the upper wall inside the outer cylinder 53, and the outer cylinder 53 portion above the probe holder 5505 has a smaller diameter than the probe holder 5505. 5305 is opened. The probe holder 5505 is formed of a conductive member, and four through holes 5507 are formed on the outer peripheral portion of the probe holder 5505 at intervals in the circumferential direction, as shown in the perspective view of FIG. In addition, a probe 5509 made of a conductive member is provided so as to extend upward at a substantially central position of the probe holder 5505, and the upper end of the probe 5509 is located in the hole 5305 of the outer cylinder 53.

The work holder 57 is formed of an insulating member, and has a disc portion 5701 having a diameter corresponding to the outer cylinder 53 and a flange portion 5703 projecting from the outer periphery of the disc portion 5701.
The disk portion 5701 is mounted on the upper end of the outer cylinder 53 via the O-ring 5307. The disc portion 57
In the central part of 01, as shown in the enlarged sectional view in FIG.
A housing portion 5705 for housing the explosion-proof valve device 17 is formed. The accommodating portion 5705 has a small diameter portion 5707 formed to have substantially the same diameter as the hole 5305, and an explosion proof valve 1701.
The large-diameter portion 5709 having a diameter larger than that of the large-diameter portion 1707, the annular step portion 5711 connecting the small-diameter portion 5707 and the large-diameter portion 5709, and the large-diameter portion 5709 formed on the upper surface of the disc portion 5701. And an inclined surface portion 5713. The accommodating portion 5705 includes the small-diameter portion 5707,
A gasket 5715 having a shape corresponding to the large diameter portion 5709 and the step portion 5711 is attached, and the gasket 5715 is attached.
An annular mounting surface 5717 on which the stepped portion 1711 of the explosion-proof valve 1701 is mounted and an inner peripheral surface 5719 in which the large diameter portion 1707 is housed are formed on the inner surface of the.

The work retainer 59 is formed of a conductive member and has a large diameter portion 5901 having substantially the same diameter as the outer cylinder 53.
A small diameter portion 5903 having a diameter larger than the small diameter portion 5707 of the accommodation portion 5705 and inserted inside the large diameter portion 1707 of the explosion-proof valve 1701, and a step portion connecting the large diameter portion 5901 and the small diameter portion 5903. And 5905. An explosion-proof valve 170 is provided at the center of the lower surface of the small diameter portion 5903.
1 has a cylindrical recess 5 having a diameter substantially corresponding to the small diameter portion 1709.
907 is formed, and the depth of the recess 5907 is dimensioned so as not to hinder the deformation of the bottom surface 1713 of the explosion-proof valve 1701 as shown by the dotted line in FIG.

As shown in FIG. 5, the step portion 1 of the explosion-proof valve 1701 is attached to the mounting surface 5717 of the gasket 5715.
711 is placed, and the step portion 1711 is sandwiched between the small diameter portion 5903 of the work retainer 59 and the placing surface 5717, so that the explosion-proof valve device 17 causes the accommodation portion 57 of the work holder 57.
05, the disk portion 5701 of the work holder 57
And the stepped portion 5905 of the work retainer 59 and around the small diameter portion 5903 of the work retainer 59.
909 is provided, and in this state, the disc 1703
The upper end of the probe 5509 is brought into contact with a substantially central portion of the lower surface of the probe. In addition, reference numeral 8 in the drawing denotes a conduction sensor that detects an electrical conduction state between the outer cylinder 53 and the work retainer 59.

FIG. 6 is a block diagram of the control unit of the welding strength measuring apparatus. The control unit 9 of the welding strength measuring device 3 includes a pressure oil supply unit 91 that supplies pressure oil to the passage 5101 of the base 51 and an explosion-proof valve 1701 that is pressurized by the pressure oil from the pressure oil supply unit 91. A pressure gauge 93 for calculating the pressure of the bottom surface 1713, a control unit 95 for controlling the pressure oil supply and hydraulic pressure from the pressure oil supply unit 91, and for controlling the operation of the pressure gauge 93 are provided.

The pressure oil supply unit 91 includes an air supply source 9101, an electropneumatic regulator 9103 connected to the air supply source 9101 for boosting the air, and an electropneumatic regulator 9.
A program adjuster 9105 for controlling the operation of 103,
A pressure oil tank 9107 (corresponding to fluid supply means) and the electropneumatic regulator 91 connected to the pressure oil tank 9107.
03 and an air-hydro booster 9109 for adjusting the hydraulic pressure of the pressure oil, and a leak valve 91 interposed between the electro-pneumatic regulator 9103 and the air-hydro booster 9109.
11 and 11.

The electropneumatic regulator 9103 includes an air intake port 9113, an air exhaust port 9115, a valve body (not shown) provided between the air intake port 9113 and the air exhaust port 9115, and an opening of the valve body. And a voltage input terminal 9117 for setting the valve time. The air intake port 9113 is connected to the air supply source 9101, and the air discharge port 9115 is connected to the air hydro booster 9109 via the leak valve 9111. Further, the valve body is configured to open for a time corresponding to the value of the voltage input to the input terminal 9117, and the air from the air supply source 9101 is an air corresponding to the valve opening time of the valve body. The pressure is supplied to the air hydro booster 9109.

The program controller 9105 includes an input interface 9119, an input switch section 9121, a computing unit 9123, a reference clock generator 9125, and a buffer 9.
127, a D / A converter 9129, and an output interface 9131.

A start command signal for the welding strength measuring device 3 is input from the control unit 95 to the input interface 9119. The input switch unit 9121 is composed of a numeric keypad and the like, and the voltage value corresponding to the maximum air pressure of the air supplied from the electropneumatic regulator 9103 to the air-hydro booster 9109 and the time required to reach the maximum air pressure are input. To be done. These voltage values and required times are determined according to the pressure rising pattern of the pressure oil supplied to the passage 5101. The computing unit 9123 operates from the electropneumatic regulator 9103 to the air hydro booster 9109.
In order to make the air pressure supplied to the maximum air pressure in the required time, from the input of the start command signal until the required time elapses, the valve opening time of the valve body is set at regular time intervals. And the electro-pneumatic regulator 910 accordingly.
3 and the voltage value to be output to the input terminal 9117.

The reference clock generator 9125 generates a reference clock for counting the fixed time and outputs it to the arithmetic unit 9123. The buffer 9127 temporarily stores a digital signal indicating the voltage value calculated by the calculator 9123. The D / A converter 9129
Converts the indicated digital signal once stored in the buffer 9127 into an analog voltage. The output interface 9131 is connected to the input terminal 9117, and the voltage converted by the D / A converter 9129 is output from the output interface 9131 to the input terminal 9117.

Pressure oil is stored in the pressure oil tank 9107, and the passage 5101 is provided through a supply path (not shown).
It is connected to the. The air hydro booster 9109
Is provided in the supply path. As shown in the sectional view of FIG. 7, the air-hydro booster 9109 includes a cylinder body 9133, a piston rod 9135 incorporated in the cylinder body 9133, and a piston rod 9109.
The piston 9141 is provided at the base end of the cylinder 135 and divides the inside of the cylinder body 9133 into a front chamber 9137 and a rear chamber 9139.

In the cylinder body 9133, the front chamber 9
Air inlets and outlets 9143 and 9145, which communicate with the rear chamber 139 and the rear chamber 9139, respectively, and a pressure oil passage 9147, which is a part of the supply passage, is formed inside the cylinder body 9133. Is formed with a valve portion 9151 that is blocked by the piston rod 9135 by sliding the piston 9141 to the front chamber 9137 side. The piston rod 9135 is provided in the pressure oil passage 9147 portion on the passage 5101 side of the valve portion 9151. A cylinder portion 9153 having a corresponding diameter is formed.

In this air hydro booster 9109,
When air flows into the front chamber 9137 from the air inlet / outlet 9143, the piston 9141 slides to the rear chamber 9139 side, and the tip of the piston rod 9135 causes the cylinder portion 9 to move.
The valve portion 9151 is opened at the same time as being withdrawn from 153, whereby the pressure oil on the side of the passage 5101 with respect to the cylinder portion 9153 has the same hydraulic pressure as on the pressure oil tank 9107 side.

On the other hand, when the air from the electropneumatic regulator 9103 is sent to the rear chamber 9139, the piston 91
41, the air pressure received by the surface 9155 on the rear chamber 9139 side increases, the piston 9141 slides to the front chamber 9137 side, and the valve portion 91 is moved by the peripheral surface of the piston rod 9135.
51 is closed, the tip of the piston rod 9135 advances into the cylinder portion 9153 of the pressure oil passage 9147,
The pressure oil on the side of the passage 5101 with respect to the cylinder portion 9153 is pressurized higher than the oil pressure on the side of the pressure oil tank 9107. At this time, the pressure increase ratio between the air pressure received by the surface 9155 and the hydraulic pressure on the passage 5101 side is the reciprocal of the area ratio between the surface 9155 and the cross section of the piston rod 9135.
Therefore, when the pressure of the air from the electropneumatic regulator 9103 sent to the rear chamber 9139 is increased, the pressure oil on the side of the passage 5101 with respect to the cylinder portion 9153 is amplified by the increased pressure of the air and increased in pressure. To be done.

The leak valve 9111 operates under the control of the control unit 95, connects the air exhaust port 9115 of the electropneumatic regulator 9103 to one of the front chamber 9137 and the rear chamber 9139 of the air hydro booster 9109. , The other of the front chamber 9137 and the rear chamber 9139 is opened. Note that FIG. 7 shows a state in which the leak valve 9111 connects the air outlet 9115 to the front chamber 9137.

The pressure gauge 93 has an input buffer 930.
1, peak hold circuit 9303, display unit 930
5 and a printer 9307. The pressure sensor 7 is connected to the input buffer 9301, the voltage output from the pressure sensor 7 is fetched at every constant sampling cycle, and the fetched voltage is held until the next sampling cycle. The peak hold circuit 9303
Holds the higher voltage of the voltage previously captured by the input buffer 9301 and the current voltage captured by the input buffer 9301 in the next sampling period.

The display unit 9305 is, for example, 7-
It is composed of a display composed of a group of segment LEDs, a liquid crystal panel and the like, and a driver for driving the display. The printer 9307 includes, for example, a thermal transfer type or wire dot type printing unit, and a driver for driving the printing unit. The drivers of the display unit 9305 and the printer 9307 operate under the control of the control unit 95.

The control unit 95 includes an input interface 9501, a computing unit 9503, a memory 9505, and an output interface 9507. A start switch 9509 is connected to the input interface 9501, and the continuity sensor 8 is connected via a signal converter 9511. The start switch 9509 is
It is operated when the welding strength measuring device 3 is started. The signal converter 9511 outputs a high-level ON signal when the conduction sensor 8 is detecting conduction, and outputs a low-level OFF signal when detecting non-conduction.

When the operation unit 9503 detects the operation of the start switch 9509, the arithmetic unit 9503 outputs the signal converter 95.
Confirm that the input signal from 11 is ON signal,
The operation of the welding strength measuring device 3 is detected by generating the start command signal and detecting that the input signal from the signal converter 9511 has changed from an ON signal to an OFF signal after the welding strength measuring device 3 is started. An end command signal for ending is generated. The memory 9505 includes the arithmetic unit 9503.
Stores a program for performing the above processing.
The output interface 9507 is an input interface 9119 of the program controller 9105, a leak valve 9111, a display unit 9305, and a printer 930.
7 are connected to the driver, and the start command signal and the end command signal generated by the arithmetic unit 9503 are output to them.

In the present embodiment, the pressure sensor 7, the input buffer 9301 of the pressure gauge 93 and the peak hold circuit 9303 constitute pressure detecting means, and the continuity sensor 8,
Outer cylinder 53, probe holder 5505, probe 550
9, the work clamp 59, the control unit 95, and the signal converter 9511 constitute the continuity detecting means, and the pressure gauge 93
The display unit 9305 and the printer 9307 constitute an output unit. Further, in the present embodiment, the pressure oil supply unit 91 excluding the pressure oil tank 9107 and the control unit 95 constitute a control means.

Next, the welding strength measuring device 3 having the above-mentioned structure
The projection 1715 of the explosion-proof valve 1701 and the disk 1
The operation of measuring the welding strength with 703 will be described. First, for example, assuming an internal pressure increase pattern when the power generation element of the secondary battery 1 of FIG. 1 is in an overcurrent state and the internal pressure of the outer can 11 increases, the pressure that reaches the bottom surface 1713 of the explosion-proof valve 1701 in the same pattern. The electropneumatic regulator 910 for increasing the oil pressure of oil, that is, the oil pressure of the pressure oil supplied from the pressure oil tank 9107 to the passage 5101.
The voltage value corresponding to the maximum air pressure of the air supplied from 3 to the air hydro booster 9109 and the time required to reach the maximum air pressure are determined. Then, the calculated voltage value and the required time are input from the input switch section 9121 of the program controller 9105.

Further, in parallel with the input, the explosion-proof valve 1701 is placed in the accommodating portion 5705 of the work holder 57, and the step portion 1711 of the explosion-proof valve 1701 is pressed from above by the work retainer 59 to prevent the explosion-proof valve. Device 17 for housing 5705
And the upper end of the probe 5509 is in contact with the lower surface of the disk 1703. further,
The pressure oil in the pressure oil tank 9107 is supplied to the supply path and the passage 510 of the base 51 by means such as a pump (not shown).
1. Internal passage 5501 of inner cylinder 55, probe holder 55
The through hole 5507 of No. 05, the hole 5305 of the outer cylinder 53, and the through hole 1719 of the disk 1703 are filled up to the space 1723 of the explosion-proof valve device 17, and the hydraulic pressure thereof is made equal to the atmospheric pressure. When the above preparation is completed, the start switch 9509 is operated.

At this point, the protrusion 17 of the explosion-proof valve 1701 is
15 and the disk 1703 are welded, and the explosion-proof valve 1701 and the work retainer 59 are in contact with each other, and the disk 1703 is in contact with the outer cylinder 53 via the probe 5509 and the probe holder 5505. The outer cylinder 53 and the work retainer 59 are electrically connected to each other, and the conduction sensor 8 detects the conduction state.
Therefore, from the signal converter 9511 to the control unit 95
The ON signal is input to the arithmetic unit 9503 of the above, and the activation instruction signal is generated by the arithmetic unit 9503 which detects the operation of the activation switch 9509, and is output to the program controller 9105 and the leak valve 9111.

The leak valve 9111 connects the air outlet 9115 of the electropneumatic regulator 9103 to the front chamber 9137 of the air-hydro booster 9109 before the welding strength measuring device 3 is started. In response to this, the air outlet 9115 is switched to be connected to the rear chamber 9139 of the air hydro booster 9109, and the air from the electropneumatic regulator 9103 flows into the rear chamber 9139. Becomes

The start command signal output to the program controller 9105 is the input interface 91.
19 is input to the calculator 9123, and in response thereto, the voltage value calculated by the calculator 9123 at regular time intervals from the input of the start command signal to the passage of the required time. Is output to the input terminal 9117 of the electropneumatic regulator 9103 in real time as an analog voltage.

In the electropneumatic regulator 9103, the valve body is opened at a time corresponding to the voltage input from the program controller 9105 to the input terminal 9117, and the electropneumatic regulator 9103 outputs the air hydro valve in accordance with the valve opening time. The air supplied to the booster 9109 is boosted. In the air-hydro booster 9109, the electro-pneumatic regulator 910
3 increases the pressure of the air supplied to the rear chamber 9139 through the leak valve 9111, the piston rod 9135 advances into the cylinder portion 9153 and fills the passage 5101 to the space portion 1723 of the explosion-proof valve device 17. The pressure oil is pressurized, and as a result, the bottom surface 1 of the explosion-proof valve 1701 is
713 is pressed upward by the pressure oil.

On the other hand, after the welding strength measuring device 3 is activated, the hydraulic pressure in the internal passage 5501 is detected by the pressure sensor 7 and taken into the input buffer 9301 of the pressure gauge 93, and the maximum value of the detected hydraulic pressure is peak-held. Circuit 93
Held at 03. Here, the oil pressure of the internal passage 5501 detected by the pressure sensor 7 is equal to the oil pressure of the pressure oil that reaches the space portion 1723 of the explosion-proof valve device 17 and pressurizes the bottom surface 1713. The pressure oil holds the maximum value of the pressure applied to the bottom surface 1713.

By the way, when the bottom surface 1713 is continuously pressed by the pressure oil, the bottom surface 1713 starts to be deformed from the recess 1717 on the bottom surface 1713, and when the hydraulic pressure rises to some extent, the bottom surface is indicated by a dotted line in FIG. 1713 is deformed,
The protrusion 1715 on the bottom surface 1713 and the disk 1703
The welding with and peels off. Then, by peeling the welding,
The outer cylinder 53 and the work clamp 59 are insulated from each other, the conduction sensor 8 detects the non-conduction state, and the input signal from the signal converter 9511 to the calculator 9503 of the control unit 95 changes from an ON signal to an OFF signal. Change, arithmetic unit 950
3 generates an end command signal for ending the operation of the welding strength measuring device 3, and the display unit 9 of the pressure gauge 93.
It is output to the driver of the printer 305 and the printer 9307, the program controller 9105, and the leak valve 9111.

The end command signal is sent to the display unit 93.
05 and the driver of the printer 9307,
The driver drives the display of the display unit 9305 and the printing unit of the printer 9307, and is held in the peak hold circuit 9303 at the time of inputting the end command signal, that is, at the time when the conduction sensor 8 detects the non-conduction state. Further, the maximum value of the pressure applied to the bottom surface 1713 of the explosion-proof valve 1701 is digitally displayed on the display and printed on the recording paper (not shown) by the printing unit.

In parallel with this, the program controller 9105
The arithmetic unit 9123 stops the boosting operation of air by the electropneumatic regulator 9103 in response to the input of the end command signal. Further, in response to the input of the end command signal, the leak valve 9111 causes the electropneumatic regulator 91 to operate.
03 air outlet 9115 to the air hydro booster 91
Switch to connect to the anterior chamber 9137 of 09. As a result, the piston 91 of the air hydro booster 9109 is
41 slides to the rear chamber 9139 side,
The pressure oil on the passage 5101 side with respect to 153 is returned to the same atmospheric pressure as on the pressure oil tank 9107 side. With the above operation, one measurement operation is completed. When replacing the explosion-proof valve device 17 set in the housing portion 5705 of the work holder 57 for the next measurement operation, the passage 51
01 to the pressure oil filled in the space 1723 of the explosion-proof valve device 17 is returned to the pressure oil tank 9107.

As described above, according to the present embodiment, the welding strength measuring device 3 is composed of the structure portion 5 and the control portion 9, and the structure portion 5
The work holder 57 provided with a housing 5705 for setting the explosion-proof valve device 17, and the space portion 1 of the explosion-proof valve device 17.
723, the base 51, the outer cylinder 53, the inner cylinder 55, and the probe holder 5505 in which a passage for pressure oil is formed, and the work retainer 5 electrically connected to the protrusion 1715 of the bottom surface 1713.
9, the outer cylinder 53 is electrically connected to the disk 1703 welded to the protrusion 1715, and the hydraulic pressure of the pressure oil and the conductive state of the outer cylinder 53 and the work retainer 59 are connected to the pressure sensor 7. And the continuity sensor 8 respectively, and the controller 9 controls the control unit 9 based on the pressure oil supply unit 91 that supplies pressure oil to the passage and adjusts the oil pressure, and the detection results of the pressure sensor 7 and the continuity sensor 8. , The protrusion 1
The pressure gauge 93 and the control unit 95 detect and output the oil pressure of the pressure oil at the moment when the electrical connection between the disk 715 and the disk 703 is cut off.

Therefore, by increasing the hydraulic pressure of the pressure oil under the control of the pressure oil supply unit 91, the explosion-proof valve 1
The pressure applied to the bottom surface 1713 of the 701 can be made the same as the internal pressure increase pattern when the power generation element of the secondary battery 1 in FIG. 1 goes into an overcurrent state and the internal pressure of the outer can 11 increases, and The pressure applied to the bottom surface 1713 at the moment when the protrusion 1715 and the disk 1703 are separated from each other by welding is measured by the pressure sensor 7, the continuity sensor 8, and the pressure gauge 9.
3 and the control unit 95 can reliably detect, and the welding strength between the protrusion 1715 and the disk 1703 can be measured reliably and with good reproducibility.

In the present embodiment, the structure in which the bottom surface 1713 is pressed by the pressure oil has been described, but the bottom surface 1713 may be pressed by another fluid.
Further, in this embodiment, the protrusion 1715 and the disk 17 are
The case of measuring the welding strength with 03 was explained,
For example, even after the conduction sensor 8 detects the non-conduction state, the pressure oil continues to be boosted, and the peak hold circuit 9 of the pressure gauge 93 is provided.
At the moment when a steep drop in hydraulic pressure is detected by 303, the pressure detected by the pressure sensor 7 is displayed on the display unit 9
If it is configured to output from the 305 and the printer 9307, the explosion proof valve 170 can be
It is also possible to measure the pressure applied to the bottom surface 1713 at the moment when 1 is split. Furthermore, in the present embodiment, the device for measuring the welding strength of the explosion-proof valve device used in the explosion-proof sealed secondary battery has been described, but the present invention is not limited to the measurement of the welding strength of the explosion-proof valve device for the secondary battery. Needless to say, by appropriately changing the structure of the structure portion 5, it can be widely applied in the case of measuring the welding strength between conductive members.

[0048]

As described above, according to the present invention, there is provided a device for measuring the welding strength of two works made of a conductive member, which is exposed to the welding part of the works and has a space between the two works. And holding means for holding the two works, fluid supply means for supplying a fluid to the space, and control means for increasing / decreasing the fluid pressure of the fluid.
Based on the conduction detection means for detecting the conduction state between the two works, the pressure detection means for detecting the fluid pressure, and the detection results of the conduction detection means and the pressure detection means,
Since the structure is provided with the output means for outputting the fluid pressure when the two works are insulated from each other, the welding strength of the two works made of the conductive member can be measured reliably and with good reproducibility. In particular, according to the present invention, in the explosion-proof sealed secondary battery, when the internal pressure thereof rises to a predetermined value, the welding of the explosion-proof valve and the conductive lead is surely peeled off to interrupt the current supply. It is suitable for use when conducting some kind of test.

[Brief description of drawings]

FIG. 1 is an upper sectional view of a secondary battery provided with an explosion-proof valve device.

FIG. 2 is an enlarged cross-sectional view of the explosion-proof valve device before being incorporated in the outer can of the secondary battery of FIG.

FIG. 3 is a sectional view of a structural portion of a welding strength measuring device according to an embodiment of the present invention.

FIG. 4 is a perspective view of the probe holder shown in FIG.

5 is an enlarged cross-sectional view of the structure portion of FIG.

FIG. 6 is a block diagram of a control unit of a welding strength measuring apparatus according to an embodiment of the present invention.

7 is a sectional view showing the structure of the air-hydro booster shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Secondary battery 13 Closing lid (positive electrode terminal) 17 Explosion-proof valve device 1701 Explosion-proof valve 1703 Disk (member connected to positive electrode material) 1705 Storage member (holding means) 1715 Projection (welding part) 1723 Space part 3 Welding strength Measuring device 53 Outer cylinder (conduction detecting means) 5505 Probe holder (conduction detecting means) 5509 Probe (conduction detecting means) 59 Work clamp (conduction detecting means) 7 Pressure sensor (pressure detecting means) 8 Continuity sensor (conduction detecting means) 9101 Air supply source (control means) 9103 Electropneumatic regulator (control means) 9105 Program controller (control means) 9107 Pressure oil tank (fluid supply means) 9109 Air hydro booster (control means) 9111 Leak valve (control means) 9301 Input buffer (Pressure detection means) 9303 Peak hold circuit ( Force detection means) 9305 display unit (output means) 9307 printer (output means) 95 control unit (conduction detecting means, control means) 9511 signal converter (conduction detecting means)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H01M 2/06 F 2/12 101

Claims (3)

[Claims] 1. An apparatus for measuring the welding strength of two works made of a conductive member, which defines a space between the two works so as to face the welded part of the works, and the two works. Holding means for holding the fluid, fluid supply means for supplying fluid to the space, control means for increasing / decreasing the fluid pressure of the fluid, conduction detecting means for detecting a conduction state between the two works, Pressure detecting means for detecting a fluid pressure, and output means for outputting the fluid pressure at a time point when the two works are insulated from each other, based on the detection results of the conduction detecting means and the pressure detecting means. Characteristic welding strength measuring device. 2. One of the two works is a member that is electrically connected to a positive electrode material for power generation of a secondary battery, and the other is electrically connected to a positive electrode terminal of the secondary battery. The welding strength measuring device according to claim 1, wherein the welding strength measuring device is an explosion-proof valve that is deformed in a direction away from the conductive member as the internal pressure of the secondary battery rises. 3. The explosion-proof valve is configured to be capable of being cleaved by a deformation of a predetermined amount or more, and based on the detection result of the pressure detecting means, the fluid pressure at the time when the fluid pressure decreases by a predetermined value or more per unit time. The welding strength measuring device according to claim 2, further comprising second output means for outputting the fluid pressure.