JPS6041424B2 - Lead-acid battery electrode plate manufacturing method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing an electrode plate group for lead-acid batteries, and its purpose is to provide an electrode plate group that is effective for industrial production of lead-acid batteries.

Welding or integral formation of the base ear and shelf of lead-acid batteries was done by burner welding or cast-on strap methods.

Burner welding is a method of melting and integrating joints using the thermal energy of a so-called gas flame, and is currently the most commonly used method.

However, when welding the base edge and the shelf made of lead alloy by gas welding, especially when the lead alloy used is a gold alloy-calcium (Pb-Ca) alloy, an oxidation reaction caused by an oxygen-hydrogen burner flame occurs. , an oxide film is formed on the surface of the Pb-Ca alloy, and the welded part cannot be completely melted and integrated.
A connection failure occurred during the welding process. In order to achieve good welding, the combustion mixture ratio of oxygen and hydrogen in the burner flame has a subtle influence, and its adjustment requires advanced technology and skill. Further, reducing flux has been used during welding, but even with flux, the oxide film could not be completely removed, and a good welded joint could not be obtained.
In addition, as a characteristic of the thermal energy of the burner flame, the surfaces of the shelves and extreme base edges that are in contact with the burner flame are melted well, but the inside of the shelves etc. cannot be sufficiently heated, so the melting occurs. The welded part was shallow and the sufficient mechanical strength required for the welded part could not be obtained.

In the case of the cast-on strap method, although the molten part is formed wide and deep, the amount of lead used to form the shelf increases, the weight of the electrode plate group increases, and the molten lead in the shelf part takes a long time to solidify. It has the fundamental drawback that it takes a long time to process and the quality of life deteriorates. Furthermore, with this cast-on strap method, the ears of the electrode plate are inserted into molten lead, so the surface of the ears of the electrode plate must be kept clean, free of oxide films and deposits. However, if foreign matter is attached, it cannot be reliably melted and integrated with molten lead, resulting in a reduction in welding strength.

The present invention provides a new method of manufacturing an electrode plate group and an apparatus therefor that solves these various problems all at once.

The first characteristic required of the shelf as a current collector of a lead-acid battery is corrosion resistance.

This is because an oxidation reaction occurs at the anode when charging a lead-acid battery.
Further, although a reduction action occurs at the cathode, the anode in particular is required to be stable over a long period of time against corrosion due to oxidation reactions. In addition, the plurality of pole base ears are integrated with one shelf, and the shelf plays an important role as a current collector for each pole plate, extracting the electromotive force generated when the battery is discharged to the outside. It is desirable that the electrical resistance of the melted portion with each electrode plate ear be as low as possible. This is to keep the so-called internal resistance of the battery low. In addition, the shelf is required to have sufficient mechanical strength at the welded portion as a holder for the electrode plate group. Therefore, the properties required for the weld between the edge and the shelf of the electrode plate are: ■ Sufficient resistance to corrosion due to oxidation reaction, 'B' Low conductive resistance, 'C
- High mechanical strength. The present invention provides an effective method to satisfy these demands. In general, among the many types of alloys used by Mainichi, lead-antimony (Pb-Sa) alloys are relatively unaffected by oxide films when welding, but Pb-Ca alloys tend to have oxide films on the welding surface. , there was a tendency that good welding could not be achieved.

Therefore, no matter what welding method is adopted, how to suppress or remove the formation of this oxide film is an important point in forming a good welded part.

In the manufacturing method of a lead-acid battery, in the process of chemically forming the electrode plates, a method of chemically forming the electrode plates in a turtle tank in which a group of electrode plates has already been formed and incorporated;
There are two methods, one is to chemically form the electrode plates before they are assembled in the dew tank, and one important point is which manufacturing method to use when forming the electrode plate group.

When using a so-called chemically modified electrode plate, the surface of the ear portion is covered with a thick layer of oxide film, and welding cannot be performed as it is. On the other hand, a non-chemically formed electrode plate (Kametan chemically formed electrode plate) has good weldability because the oxide film is not formed thickly. This applies to both gas burner welding and cast-on strap welding. In recent years, chemical agent electrode plates have been frequently used, but on the other hand, in the manufacturing process, they have an unfavorable effect on the health of workers engaged in the work of removing oxide films. During burner welding, a rotating metal wire brush was used to cleanly remove the oxide film on the base edge from a total of five locations: four sides, front, back, left and right, and the top.

Polishing the edges of the electrode plates with a rotating wire brush required a lot of effort and generated dust. Because the polishing process involves pressing the plate against a rotating metal wire brush, rotational vibrations are transmitted to the hand holding the plate, which can cause muscle pain in the arm and generate dust, which is harmful to the worker's health. There was a negative impact.

In the present invention, taking this point into consideration, it is now possible to clean only two surfaces, the part where the welding electrode contacts and the part to be welded, instead of cleaning a total of five surfaces.
This method simplifies the process and makes it possible to clean both sides of the proximal ear by pressing to separate and cut the lattice. This pressing method dramatically improves the accuracy of the electrode plate compared to the conventional method.
The effect is that the number of defective electrode plates mixed in during assembly is drastically reduced. Although it is common sense to expose a clean metal part in advance to the part to be welded, ``There is also a method that does not require such pretreatment by machining.

For example, there is a method using flux or a method of activating the welded part. However, in order to form a good weld, it is easiest and most reliable to clean the weld.

At the practical stage of the present invention, a simple method of extruding the metal was adopted, but other methods such as applying heat or using ultrasonic waves to remove the oxide film may also be considered. Although these seem to be relatively effective means, it has been confirmed that if the welded area is completely dirty, it is difficult to form a good welded area.

Therefore, it seems to be an effective method in the case of relatively clean extreme basal ears. It is based on the fact that when metals are generally pretreated by pounding or heating the parts to be welded, and then welded, a relatively good weld is formed.

This applies external energy to the molecules existing inside the metal structure of the melted part, distorts the aligned molecular structure, and makes it easy to destroy the molecular structure within the metal structure, making it difficult to interact with dissimilar metals. The purpose is to activate the so-called weld zone to facilitate the formation of a mixed structure.

External energy that activates or deactivates the welded portion includes impact energy, thermal energy, and vibration energy caused by ultrasonic oscillation. The main purpose of the present invention is to weld the trailing shelf part as a lead component and the plate lug by electrical resistance welding, but the feature is that the welding is performed in the direction in which the shelf part and the plate lug intersect. voltage and energized.

Therefore, in the present invention, the main focus is on crosses in the horizontal direction.
However, other applications include the above.

Also possible. Further, the idea is essentially different from the method of pressurizing and energizing in the lamination direction of the electrode plates described in Samurai Publication No. 54-71336 and Samurai Publication No. 54-73242.

The above two methods involve welding a large number of electrode plates by simultaneously pressurizing and energizing them, and these methods are possible if the contact resistance of each electrode plate ear is the same, but in practice it is difficult to weld. The contact resistance was uneven, with some parts generating heat and others not, resulting in extremely unstable welding. or,
The method of forming electrode plate groups by welding in this direction is currently used for pocket-type alkaline batteries.
It is well known in that respect. Although there is a big difference in corrosion resistance between alkaline batteries and lead batteries, it is considered that the contents shown in the above two publications cannot be put to practical use. These problems should be solved. In the present invention, the shelves of lead parts,
Special care has been taken to ensure that the heat generated energy is concentrated at the contact area with the electrode plate ears. In the present invention, welding portions are provided independently so that the same current flows through each electrode plate ear portion.

This is because welding multiple electrode plate ears using the same power source risks concentrating current in areas where it easily flows, resulting in imbalance. In order to prevent the current from becoming unbalanced, it is necessary to use components with high dimensional precision, otherwise the contact resistance cannot be kept constant.

Furthermore, even if the precision of the parts could be improved, it would be extremely difficult to divide the current into the same current. Next, make sure that the surface that comes in contact with the pressure and electrode jaws is clean.

The so-called energizing path is the electrode; the shelf part of the lead plate, the edge part of the 100-electrode plate, and the electrode a. It is desirable that the contact resistance between a and c be as low as possible in order to avoid energy loss. Therefore, it is desirable that only the contact resistance of parts b and c be high in order to concentrate heat generation. Therefore, it is necessary to clean the contact portions a and c. Since the shelf portion of the lead component is a cast product, the surface is relatively clean, but the electrode plate ear portion has various conditions as described above. In order to make these conditions the same, it is desirable to remove the surface oxide film. Generally, the weldability of metals by resistance heating welding is determined by the following formula.

= Point side [%] (Weldability) Weldability WPb in the case of lead (Pb) is: [WPb] = 32 Beauty bladder - Nose hair 83 x 100 = 76 - 〇8
%, and the weldability is quite high.

Judging from this theoretical formula, materials with low resistivity, high melting point, and good thermal conductivity, such as copper, silver, etc.
Aluminum is a typical example of a metal with extremely low weldability (Cu is 0.16%, N is 0.99%, Ag
is 0.17%).

In the case of Pb, the reason why it has relatively low resistivity and good weldability is due to its low melting point. However, the fact that the resistivity is small means that the conductivity is good. For this reason, it is used as the electrode plate of batteries, but it is very preferable for resistance welding as it generates Joule heat and is difficult to use. Furthermore, Pb has a property of being highly malleable, and has the property that a small pressure force allows the contact portion to conform and the contact area to expand.

The phenomenon obtained from these facts is that the contact resistance of the bonded portion becomes extremely small due to its good conductivity and easy conformability, and Joule heat is concentrated at the contact portion and does not generate heat.

Therefore, the phenomenon that even when welding current is applied, the joint only digs in due to pressure and no weld is formed has become a real problem. Many people gave up on welding lead alloys by resistance welding at this point and continue to do so to this day. In the present invention, the most difficult point was how to eliminate this phenomenon of non-welding.

There were so many variations. P with high weldability
By clarifying the question of why the welding does not occur properly with regard to b, we were able to establish a highly practical and innovative method for manufacturing electrode plates for lead-acid batteries. As mentioned above, the main reasons for this were Pb's good conductivity and good malleability.

This means that the joints are deformed and conform to each other before Joule heat is generated, so heat generation does not rise to the melting point. To solve this problem, the resistance of the contact portion was increased. In the present invention, a sharp edge is provided on the ledge of the lead part to ensure a heat generating point, but what is important is to create a heat generating point in the part to be welded. For example, it is preferable to provide a concavo-convex portion on at least one side of the welding portion, such as by adding serrations to the electrode plate ears or forming a knife edge, thereby limiting the contact point to the contact portion with the other portion. By doing this, the heat generating points were maintained, and by applying electricity, the heat generating points of the lead itself were made to generate heat, making it possible to form the electrode plate group in a stable state.

Of course, for this purpose, it is also important to have a welding device that actually pressurizes the electrode plate ear portion and the shelf portion and energizes them, and in the present invention, sufficient consideration has been given to this welding device as well.

Even in lead-acid batteries, in response to the recent demands for higher energy density and lighter weight, each plate that makes up the plate group has become thinner year by year, and plates with a diameter of about 0.7 to 0.9 mm are now used. has been done.

When the ears of such a thin electrode plate are pressurized with a welding electrode/pressure piece with a flat pressing end surface, the ears may be bent or bent.
The spacing between the ears was misaligned, making it impossible to apply pressure smoothly, and when electricity was applied, sparks were generated between the electrode plate ears and the electrode/pressure piece, causing significant damage to the pressure piece. .

In order to prevent this phenomenon, in the present invention, a groove is formed in the part of the welding electrode/pressing piece corresponding to the electrode plate ear, which is slightly thicker (thicker) than the electrode plate ear. The ear part can be pressurized and energized while holding the ear part while preventing deformation of the ear part. Copper is used as the electrode/pressure piece due to its heat resistance, conductivity, etc.

Although a Cu-Cr alloy is used, molybdenum (Mo) or a silver-tungsten alloy can also be used to move the heating point. 2 as a welding device
The second requirement is that the electrode/pressure piece pressurizes the electrode tab and shelf, and the power supply unit has a switching circuit that starts energizing when the pressure reaches a predetermined value. That's true.

Furthermore, the third requirement is that the electrode-cum-pressure piece must be able to move without approaching changes in the shape of the welded part in order to maintain this current supply. That is, when energization is started, the heat generating point where the electrode plate ear and the shelf meet each other generates heat and begins to melt.
Melting caused by this heat generation causes the contact between the electrode plate ear or shelf and the pressure piece to become loose, and if left as it is, heat generation or sparks may occur between the pressure piece and the ear or shelf. There is a problem that occurs. Therefore,
The electrode-cum-pressure piece gradually moves in the direction of narrowing the gap as the heating point generates heat and melts, and can be moved by a predetermined amount using an air cylinder, etc., to avoid welding changes. Must have.

Hereinafter, details of the present invention will be explained together with examples.

FIG. 1 is a cross-sectional view of the main parts of a 4-type sealed lead-acid battery according to the present invention. In the figure, 1 is a terminal projecting to the outside, 2 is a lead thereof, and 3 is a pole-shaped terminal integrated with a shelf 4. It is provided. 5 is a battery case, 6 and 6' are pole plates, 7 is a partition wall of the lightning tank,
8 is the inter-cell connector, 9 is the ear part of the electrode plate, 1 is the upper cover, 1
1 shows the completed electrode plate group.

Figure 2 shows the pole-shaped terminal 3 and the pole plate 6 before welding.
The plate-shaped terminal 3 has an edge 4 on one side of the integrally formed shelf 4.
'have. FIG. 3 is a side view showing the positional relationship between a pair of energizing pressing jigs and a group of electrode plates in a welding device. In the figure, 12' indicates the groove formation of the electrode 12, and the fifth
The top view is shown in the figure. Moreover, FIG. 4 is a top view of FIG. 3, and shows the positional relationship. 12 and 13 are welding electrodes and pressure pieces, and 14 is a welding power source.

In FIG. 3, the electrode plate ear 9 has two clean metal surfaces: the surface in contact with the electrode 12 and the welding surface in contact with the shelf 4.

The electrode 13 also serves as a stand on which to place a lead component on which the seat 3' is provided. When the space between the pressurizing electrodes 13, 13 is compressed and the pressurizing force from the left and right sides becomes 9 kg/or more, the pressure detecting section is activated and a current of 1000 to 300 volts is applied. The pressure may be detected by a mechanism that detects spring pressure and turns on a limit switch, or by detecting the air pressure of the air cylinder, or by detecting movement of the electrode using a photo sensor. When energization is started, the electrode plate ear portion 9 and the edge 4' of the shelf portion 4 are softened and melted due to heat generation.

Since the Joule heat is concentrated on the edge portion, the electrodes 12 and 13 move so as to narrow the distance between them as the edge portion becomes more difficult. The time during which the current is applied is about 15 cycles, as shown in FIG. 6, and the time required from the start of pressurization until it remains open is about 30 cycles.

Although the current waveform is shown in 15, it is actually not a square wave 15' but a shape close to a pulse wave. FIG. 6 is such a diagram because it is viewed in an enlarged manner. At the end of welding, the energization is automatically terminated by a timer installed in the power supply section.

FIG. 7 shows a partially enlarged view of the welded part, which shows the shelf part 4 provided on the pole-shaped bell terminal 3 at the end of welding.
The state of welding between the electrode plate ear portion 9 and the electrode plate ear portion 9 is shown.

In the figure, 16 is a protruding portion of the molten lead alloy. If there are many protruding parts, lead will drip between the electrode plates, causing short circuits between the positive, negative, and polar slopes.

Therefore, in order to remove this, it is recommended to form a recess 4'' as shown in Fig. 8 c and d, and form a catchment groove that prevents the molten lead from overflowing. Defects in the process will be drastically reduced.

In secondary burner welding, many short circuits between poles due to lead sag have occurred, significantly shortening the life of the storage battery and causing complaints. These problems can be easily reduced by the present invention. To give a specific example of the present invention, if the thickness of the electrode plate ears is 1.5 mm for the cathode plate and 1.5 mm for the 2-leg anode plate, then the ear width is 3.5 mm for both the negative and anode plates. I was on the side.

The dimensions of the lead parts shelf for this are 3.0 square pieces of kite and 1 piece.
．． It has a sharp edge on the 5th side. The angle of the edge is preferably an acute angle of 900 degrees or less. The shape of the edge may be an equilateral triangle, an isosceles triangle, or a scalene triangle in cross section, and may be a, b, c, or d in FIG. 8. Further, as shown in a and b' of FIG. 9, providing protrusions on the ears of the electrode plates also ensures welding. Actually 90o~6
This edge 4' is cut into the lead shelf part 4 within the range of 0o.

A Cr-Cu alloy is used for the electrode/pressure piece, and the dimensions of the groove 12' that supports the electrode tab are 0.
．． The ears are made about 5 skins larger so that the ears can be inserted smoothly. Also, the depth of the groove is 3. It is set to about 1/2 of the enemy. Regarding electrode 3, which is the opposite electrode of electrode 12, there is a seat part 13' on which the lead pole column part is placed.
shall not protrude beyond the edge of the shelf.

This is because when edge 4' softens during pressurization, 3' comes into contact with the edge of the electrode plate, and the current flows between edges 4' and 1 of the lead parts.
This is because sufficient heat generation energy cannot be obtained due to the flow being divided into the protruding portion 3', resulting in insufficient welding. The welding current is 13
00 to 150 ships are energized for approximately 12 cycles.

As mentioned above, in the present invention, it is possible to weld the electrode plate ears without polishing them.

As shown in Fig. 10, a current called preheating is applied during the pressurization stage to thermally activate and pre-treat the metal joint, removing deposits and dirt from the surface of the weld and making it clean. Moreover, it instantly destroys the oxide film on the surface of lead or lead alloy, making it possible to weld on clean metal surfaces. After this, the main current is applied to the ear part to perform welding. 17 shown in FIG. 10 is a preheating current, and 7' is a main welding current. The preheating current is applied at a time and current value of 1' of the main welding current. For example, 600 to 800 A is suitable and the cycle is 5 to 6 cycles. Also,
Instead of using this preheating current, it is also possible to use ultrasonic waves to clean the metal surface.

In the figure, ultrasonic waves are generated in the preheating part 17 to clean the molten part by pretreatment, and then the main welding current is applied to perform welding. Currently, resistance welding power sources with built-in ultrasonic waves are not in practical use, but as they are being developed, this method is considered to be an effective method.

Furthermore, in order to further simplify the method of the present invention, it is also possible to consider a method in which a plurality of welds are performed simultaneously as shown in FIG.

To explain Fig. 11, the method is such that the two electrode plate lugs are energized by the same welding power source, and the current flows from the electrode 12, passes through the groove 12', and passes through the electrode plate lug 9 and the edge 7'. The first heat generation occurs at the welding part with 13a, and then the current is 1
3a, a second heat generation is generated at the contact portion between the second ear portion 9 and the edge 4', and returns to the power source through the electrode 12a. This first and second heat generation occurs simultaneously, so if you set the power source's electric grain tap to twice that of one place, you can generate two heats with one power source.
It has the feature of being able to weld in more than one place and simplifying the equipment. FIG. 12 shows an example in which the present invention is applied to an automotive lead-acid battery.

The idea for practical application is basically the same as above, but
The shape of the lead parts used is slightly different. Reference numeral 21 denotes a lead connection body, and examples of its shape are shown in FIGS. 14a, b, c, and d.

FIG. 13 is an illustration at the beginning of welding, and FIG. 15 is a sectional view of the completed lead-acid battery. In the case of a lead-acid battery for an automobile, the width of the electrode plate ear portion 9 is relatively large, 12 to 15 inches, so that the applied current is different from that described above.

Furthermore, since the thickness is relatively thin at 0.8 to 1 mm, it is somewhat difficult to support the electrode plate. The principle is the same as above, but since the thickness of the electrode plate is thin, there is no need for an edge shape on the shelf portion of the lead component. When the example of FIG. 12 is specifically shown in numerical values, the electrode plate thickness is 0. Kalpa Snake, ear width is 1
The lead component shelf for the 0.5 side has a thickness of 2. Shipboard, width 15
It has a side shape, and a connecting body 21 is molded at either of its ends or in the center. When welding these, the welding current was 2000A for 15 cycles, and the pressure piece was 9.
It is about 0k9/carp.

The degree of welding is comparable to conventional burner welding, but the strength is even greater. For reference, the measured values are 20k9/ground in the tensile load test, which is the average value in the case of burner welding, whereas the average value in the method according to the present invention is 25k9/ground. If a load greater than this is applied to the welded part, the material of the lattice of the electrode plate will break, making measurement difficult. In practice, it is almost impossible for a moment greater than this to be applied to a welded part. This is because the electrode plate group is in close contact with the dew tank case, so it is thought that almost no load is applied to the welded part. As described above, what poses more problems in terms of battery performance are corrosion due to oxidation reactions and boundary corrosion occurring at the boundaries of welded parts.

When dissimilar alloys are welded, a phenomenon occurs in which alloys with different crystal structures mix together. Here, when considering the welding process, firstly, a phenomenon in which dissimilar alloys are heated to their melting points and melted inevitably occurs. At this time, in the case of materials with different melting points, the one with the lower melting point will melt first and flow out, so materials with extremely different melting points cannot be welded. In the case of this Gold 8 alloy, Although it is called an alloy, it contains about 90% Pb,
Since the melting points differ by only about 2 to 3%, good welding is possible. When the alloys are heated together and reach their melting point,
Because the pressure is applied here, the process of mixing different types of alloys begins. After that, the electricity is stopped, and the process proceeds to cooling and solidification, where complete ``fusion bonding'' or ``welding'' is achieved. The main difference between burner welding and resistance heating welding is that the crystal structure of the weld varies greatly depending on whether the welded area is wide or narrow. In the case of burner welding, because the flame contacts a relatively wide area, dissimilar alloys are laid down smoothly overall, and the boundaries between dissimilar alloys are not clearly defined.

However, in the case of the welding method according to the present invention, since only the abutting portions are melted, the division of the dissimilar alloy layers is relatively clear.

This is because the so-called mixed tomato-azusa layer is thin. This generates an exchange current at the interface within the battery, which poses the risk of promoting galvanic corrosion. When this exchange current was measured, it was about 0.03 mA/ in the case of burner welding, but it was 0.0 mA/ in the method of the present invention. In order to keep this exchange current low, it was found that it is most desirable to use the same alloy as the welding part material. In this welding method, the exchange current for the same alloy material was 0.03 hA/ground, which was almost the same as conventional burner welding. Furthermore, even if there is a certain exchange current value, it is thought that it will not have a great effect on the battery life. Next, an automatic manufacturing apparatus for a group of electrode plates for an automobile lead-acid battery will be described with reference to FIGS. 16 to 20.

First, as shown in FIG. 16, the electrode plate group temporarily aligned by a pair of left and right pupil plate group holding jigs 22 is conveyed to the lower side of the welding apparatus. 23 is a stopper that restricts the advancement of the electrode 13, which will be described later.

In the state shown in FIG. 16, the pressurizing and welding electrode 12 is lowered between the anode plate lug ga and the cathode plate lug gb, and the first cylinder 24 is moved so that the electrode 12 For example, the electrode plate ears 9b of the cathode are pressed to align the entire ears.

At this time, as shown in FIG. 17, the pair of jigs 22 are opened by the same width as the cell chamber spacing of the haze tank, allowing only the cathode plates to be exposed. Next, the second cylinder 25 moves as shown in FIG.
The shelf portion 4 held by the seat 13' at the tip of the pressure piece and welding electrode 13 is pressed against the rounded ear portion 9b.

Thereafter, when the electrode 12 is pushed down as shown in FIG. 19, the inclination of the electrode plate is corrected, and the photo sensor 2, which serves as an energization start switch, is provided at the rear end of the electrode support mechanism.
6 becomes conductive, the welding power source 14 is connected between the electrodes 12 and 13, and the contact portion between the ear portion 9b and the shelf portion 4 generates heat and begins to melt, but the electrode 13 is moved forward by the operation of the cylinder 25, As the electrode support mechanism 27 moves forward until it hits the stopper 23, the shelf portion 4 melts and bites into the ear portion 9b, and the shelf portion and the ear portion 9b are reliably welded. After that, as shown in FIG. 20, the electrode 12 is raised by the amount by which it was pushed down, turning off the photo sensor 26, stopping the current supply for welding, and retreating upward, and the electrode 13 also retreating to the right to return to its original state. to return to.

Such a series of welding processes is performed on the cathode plate lug and the anode plate lug, and the positive and cathode lug parts of the electrode plate group are respectively saddle-wired together.

According to the manufacturing method of the present invention, in addition to normal welding in which the electrode plate group is placed at the bottom and the welded portion is placed on top, it is also possible to perform so-called inverted welding in which the welded portion is placed at the bottom and the electrode plate group is placed on top.

In conventional burner welding, molten lead drips, so the electrode plate group must be positioned below the welded area, but even so, the molten lead drips or splashes, causing a short circuit inside the battery due to contamination. could not be prevented. However, in the present invention, such defects can be completely prevented, and the quality of the electrode plate group as a product can be further improved. As mentioned above,
In the present invention, the connection shelf made of lead and the electrode plate ear are arranged in intersecting directions and butted against each other, and an edge is provided on the surface of the shelf that contacts the electrode plate ear, thereby focusing the heat generation point (point). It can be restricted to a nearby location, and by applying pressure and electricity in this state, Joule heat is generated intensively at the heat generation point, making it easy to melt the fruit reliably.

However, since additional lead is not required, there are no restrictions on the welding position, and the amount of lead required for welding between the electrode plate ear and the shelf can be reduced, making it possible to weld in a short time. Yes, it is possible to improve the reliability of the welded part.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts of a small sealed lead-acid battery according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a butt before welding between an electrode plate ear and a shelf provided integrally with a terminal. , Fig. 3 is an explanatory diagram during welding, Fig. 4 is a top view of the main part thereof, Fig. 6 is a partial top view of one of the energizing pressurizing tools, Fig. 6 is a chart diagram during welding, Fig. 7 is an enlarged view of the welded part between the electrode plate lug and the shelf part, Fig. 8 a, b, c, and d are views showing the shape of the shelf part, and Fig. 9 a, b shows the shape of the electrode plate lug. Figure 10 is a chart diagram during welding, Figure 11 is an explanatory diagram when welding ears at two locations on a shelf at the same time, and Figure 12 is a perspective view showing the manufacture of an electrode plate group in a lead-acid battery for an actual vehicle. Fig. 13 is a schematic diagram for explaining the welding process, Fig. 14 a, b, c, and d are views showing the shape of the shelf, Fig. 15 is a partial cross-sectional view of the completed lead-acid battery, and Figs. The figure is a manufacturing progress diagram in the electrode plate group manufacturing apparatus. 3... Polar column terminal, 4... Shelf, 4'
...Edge, 6,6'...Pole plate, 9...
... Electrode plate ear part, 11... Completed electrode plate group,
12, 13...Welding electrode/pressure piece, 2...
Electrode plate support groove, 13' seat, 13a... good conductive common part, 14... welding power supply section, 26... photo sensor as energization start switch. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 19 Figure 18 Figure 20

Claims (1)

[Scope of Claims] 1. A pole base lug and a shelf having an edge on the surface in contact with the lug are arranged in an intersecting direction, and the intersecting contact portion is pressurized and energized to generate resistance heat generation at the contact portion. A method for manufacturing electrode plates for lead-acid batteries in which electrode plates are formed by welding. 2 The edge of the surface of the shelf in contact with the extreme basal ear is 60°~
A method for producing a group of electrode plates for a lead-acid battery according to claim 1, which has an angle of 90°. 3. The method for manufacturing an electrode plate group for a lead-acid battery according to claim 1, wherein an uneven portion is formed on a surface of the shelf portion that is in contact with the base ear portion. 4. The method for manufacturing a lead-acid battery plate group according to claim 1, wherein a welding power source having a preheating current, ultrasonic, or high frequency pretreatment function is used for the electric resistance welding. 5. A pair of welding electrodes and pressurizing pieces that press the base ear in an intersecting state with a shelf having an edge on the surface in contact with the ear;
A welding power supply device is connected to this pressure piece, and one pressure piece in contact with the base ear has a groove into which the ear fits, and the other pressure piece supports the shelf from below. The welding power supply device has a catch seat, and has a switching mechanism that starts energization when the pressing force between the base edge and the shelf by the pressure piece reaches a certain value, and a cutoff mechanism after the welding current has flowed for a predetermined time. A lead-acid battery electrode plate assembly manufacturing apparatus comprising: 6 Welding in which there are two pairs of welding electrodes and pressure pieces, one pressure piece in contact with the shelf is a common part with good conductivity, and the pressure pieces in contact with the extreme base ear are common. The lead acid battery electrode plate group manufacturing apparatus according to claim 5, which is connected to a power supply device.