JPH03182065A - Manufacture of laminate battery - Google Patents

Abstract

PURPOSE:To prevent blocking of an electrolyte passage with burrs produced by fusion welding in an arrangement in which frames at the peripheries of an electrode plate and a separator plate are fusion welded, by embodying the fusion weld part in a predetermined form. CONSTITUTION:The peripheral frame 8b of an electrode plate and the peripheral frame 6 of separator are fusion welded by hot butting welding ribs 14, 15 give respective specified forms previously. A channel 13 is formed in the peripheral frame 6 of the separator to serve as a passage for electrolyte. Runoff grooves for the hot deformed ribs 14, 15 are previously formed so that the welding ribs 14, 15 vanish after fusion welding to cause the weld surface to become plane. Therein the relation shall be: b(f+d)<=3/2(2ae), a>=2/3(b), b>=0.8mm, where e is depth of runoff groove, a is width, f, d are depths of ribs 14, 15, and b is width.

Description

[Detailed Description of the Invention] A. Industrial Field of Application This invention relates to electrode plates in which an insulating frame made of synthetic resin is formed around the outer periphery of a conductive member, separator plates in which a frame made of synthetic resin is formed around the outer periphery of a separator, etc. The present invention relates to a method of manufacturing a laminated battery in which frame members of battery slide members are melted and integrated with each other.

B9 Summary of the Invention The present invention provides a method for manufacturing a laminated battery in which flat electrode plates and separator plates are alternately laminated and integrated. A separator plate is formed by a synthetic resin insulating frame integrally formed with the electrode, and a welded rib having a height f1 and a width formed on the insulating frame along the outer peripheral edge of the electrode. A flat separator, a synthetic resin frame integrally formed on the outer periphery of the separator, a pair of electrolyte channels provided on opposite sides of the frame, and the outside of the electrolyte channel. Welded ribs of height d and width d are formed on the frame along the outer peripheral edge of the electrode, and depth is formed on the frame in contact with both sides of the welded ribs of the frame. Formed with a relief groove of the ezm width,
Height f and d1 of welding ribs on electrode plate and separator plate
The width b1, the depth e of the relief groove, and the width a of the groove are formed in a relationship that satisfies the following formula, 5/7 ≦b (f+d)
≦ 3/2 (2ae) a ≧ 273 b A plurality of electrode plates are stacked with a separator plate between them, and the welding ribs of each opposing electrode plate and separator plate are heated and melted, and the welded ribs are crimped and integrated. By forming a battery reaction chamber in a part surrounded by an electrode, an insulating frame, and a frame and divided into two by a separator, an electrolytic solution flow formed in the frame in the battery reaction chamber. A method for manufacturing stacked batteries that circulates through channels.

C0 Prior Art Recently, the development of battery 1E power storage stems has been promoted, the -ring of which is zinc-bromine: E-ike, zinc salt Js? 't
I-ike ponds, redox flow ponds, etc. have been developed.

These have an electrical series stacked structure to extract high voltage. Taking a zinc-bromine battery as an example, the outline of its configuration will be explained.

This zinc-bromine battery is mainly of the electrolyte circulation type and is composed of a battery body, an electrolyte storage tank, and a piping system that circulates the electrolyte between them.

Conventionally, a battery main body has bipolar electrodes, which are stacked and electrically connected in series, as shown in FIG. 3.

In FIG. 1, 6 is a separator plate having an insulating frame integrally formed on the outer periphery of the separator, and 8 is a bipolar electrode plate having an insulating frame integrally formed on the outer periphery of a conductive member.

A single cell is constructed by stacking the spacer mesh and the packing 5 on both sides with the separator plate 6 between the electrode plates 8. A plurality of these single cells, for example, 30 cells, are stacked, and finally, they are stacked at both ends. Electron rod 3゜Laminated end plate 2 and tightening end plate l
are stacked on top of each other and tightened with bolts and nuts to form an integral structure.

The electrolyte in the battery main body constructed in this manner is contained in the electrode plate 8.
The positive electrode manifold 9 and the 0-stock manifold 10 formed at the frame of the separator plate 6 and the four corners of the packing 5, and the channel 13. The electrolyte flows in and out through the electrolyte flow path of the microchannel 13a.

? The conductive member of the TII plate 8 is formed from a thin plate made of carbon plus deck, which is formed by kneading a conductive substance such as carbon into plastic, and the separator portion of the separator plate 6 is made of a microporous membrane, and the electrode plate 8 and The frame of the separator plate 6 is made of polyolefin resin such as polyethylene.

D7 Problems to be Solved by the Invention As mentioned above, in the conventional stacked battery, each single cell and electrolyte flow path are formed by tightening the stacked battery from both ends and press-fitting the frames of each electrode plate and separator plate. As a result, each frame of the battery components may creep due to the action of the electrolyte, etc.
Alternatively, there is a problem in that the force is weakened due to contraction and expansion of the frame due to changes in the environment in which the battery is placed, and a gap is created between adjacent frame bodies, causing liquid leakage from the gap.

Therefore, attempts have been made to heat-seal and integrate adjacent frames of electrode plates and separator bodies. In order to heat-seal the frames together, welding ribs are erected on each frame, and the ribs are melted and pressed against each other to form a weld. There is a problem in that the electrolyte enters the manifold or channel along the side surface, blocks the electrolyte flow path, and obstructs the flow of the electrolyte.

In view of the two points, the present invention provides a laminated battery that can be laminated and integrated in a manner that prevents the electrolyte flow paths such as channels from being blocked even when the frame portions of the electrode plate and the separator plate are heat-sealed. The purpose is to provide a new manufacturing method.

E6 Means for Solving Problems The method for manufacturing a 1m cell according to the present invention is such that the height from the surface of the frame is f and the cross section of the width is A rectangular welding rib is provided, and a welding rib with a rectangular cross section with a height of d from the frame surface and a width of b is provided at the joint part of the other frame, and both lateral sides of the welding rib are provided. The depth from the frame surface is e and the groove width is a.
A relief groove with a rectangular cross section is formed, and the cross-sectional area b (f + d) of the welding ribs welded to each other is at least 1.5 times the cross-sectional area of the sum of the cross-sectional areas of the relief bays on both sides (2ae). The groove width a of the relief groove is 2/3 of the width of the welding rib.
Next, the opposing welding ribs are heated and melted using a hot plate heater mold, the frames to be joined are crimped, and the melted welding ribs are welded together. It is characterized by integrated lamination.

11. Effect By using the above-described means, during hot plate welding, all the bulges generated from the melted welding ribs enter the relief grooves, and the frames are integrated without overflowing.

Therefore, it is possible to prevent burrs from clogging electrolyte flow paths such as channels.

Note that the above-mentioned effect applies not only to the case where the present invention is applied to a zinc-bromine battery, but also to a zinc-chlorine battery.

Similar effects can be achieved when applied to a stacked battery such as a redox flow battery.

G. Examples Example 1 Hereinafter, one example of the method for manufacturing a laminated electrode of the present invention will be described with reference to FIGS. 1 and 2.

Note that in FIGS. 1 and 2, parts corresponding to those in FIG. 3 described above are given the same reference numerals, and detailed explanation thereof will be omitted.

In the vertical cross-sectional view of the main part of FIG. 1, 8b is a frame provided on the outer periphery of the electrode part of the electrode plate before lamination and integration by hot plate welding, and 12 is a hot plate welded frame provided on the outer periphery of the separator. This is the frame before it was laminated into one piece by the method.

The frame body 8b of this electrode plate has welding ribs 14 having a rectangular cross-section symmetrically provided on both sides of the frame body 8b in two protruding rows. The height of each welding rib 14 is f, and the width thereof is b.

Furthermore, the frame 12 of the separator plate is formed thicker than the frame 8b of the electrode plate, and a channel consisting of a groove with a rectangular cross section that serves as a flow path for the electrolytic solution is formed in the center of the frame. ing. On both sides of the frame 12 of the separator plate, welding ribs 15 are provided on both sides with the channel 13 in between, at positions corresponding to the welding ribs 14 when stacked on the frame 8b of the electrode plate.
to protrude. In addition, relief grooves 16 having a rectangular cross section are formed in both lateral sides of the welding rib 15 to release and store burrs generated during hot plate welding. Then, the frame 1 of the welding rib 15
Let the height from the surface of 2 be d, and its width be b.

Further, the depth of the escape groove 16 from the surface of the frame body 12 is set to e, and the groove width is set to a. The width of the channel 13 is G, and the relief grooves 16 are located at a distance C from both sides of the channel 13, respectively.

At the same time, each dimension is configured to satisfy the following formula.

b (f+d)≦3/2 (2ae)−■a≧2/3(
b) ...0550.8mm
...■Next, a method of stacking and integrating the electrode plate frame 8b and the separator plate frame 12 constructed as described above by hot plate welding will be described.

First, the tips of each welding rib 14, 15 are melted using a hot plate heater mold 17, as shown by chain lines in FIG. Next, as shown in FIG. 2, they are crimped and welded.

During this welding, the burrs of each welding rib 14, 15 are removed from the relief groove I.
6 and satisfies this requirement, so that it does not enter into the channel 13 and is welded.

In addition, in the case of a dimensional structure that does not satisfy the above-mentioned formulas (1), (2), and (2), the welding ribs 14 and 15 flow into the microchannel 13 and close it.

For example, the configuration of this embodiment includes the above-mentioned (1) and (2).

■As values that satisfy the formula, a=3mm, b=15mm
, d=l, Omm, e=0.5mm, f=10m
As a result of testing by preparing 10 sets of m and setting C to be as small as possible and hot plate welding, the results were as follows.
Nine out of ten pairs were successfully welded, and the channel 13 was not blocked by burrs.

However, for comparison with this example, a=1.5 mm, e
= 0.3 mm and other dimensions are the same as in this example b-
=1.5mm, d=1. Omm, f=1. As a result of preparing 10 sets of Omm and testing them by hot plate welding, it was found that burrs had entered the channel 13 and blocked it in 9 out of 10 sets.

However, even with the shape of the Escape 16 mentioned above, this Harugei
If the distance C between M l 6 and the channel 13 is made extremely large, it is possible to prevent climbers from entering the channel 13, but in this case, the frames 8b and 12 must be made that much larger, and the battery body becomes larger. Therefore, it cannot be realized.

Example 2 Welding rib film area: b (f + d) Relief skin step surface: 2ae Ten sets of each were prepared with different ratios, and tested by hot plate welding to determine whether the channel or the like would be blocked. When the membrane area ratio was 1.6 or more, the membrane area of the relief groove became too large and a recess was formed in the frame portion.

Further, the groove width a at full relief may be at least ⅔ of the width of the welding rib. The groove width a is 2/3 of the width of the welding rib.
If the welding rib becomes smaller, the resin of the welding rib will not fill the inside of the relief groove, and a space will be created in the relief groove, resulting in insufficient welding.

■1 Effect of the Invention As detailed above, according to the method for manufacturing a laminated battery of the present invention, a ′:ζJ to r,
A welding rib with a rectangular cross section is provided for the width, and relief lines are provided on both sides of the welding rib at the joint part of the other frame.
A welding rib with a rectangular cross section of height d and width b is provided, and relief grooves with a depth C and a groove width a of rectangular cross section are provided on both sides of the welding rib. Cross-sectional area b
(f-+-d) is 1 of the sum (2ae) of the cross-sectional area of the escape poem
゜5 times or more, and the width a of the relief groove is set to be 2/3 or more of the width of the welding rib, and then the opposing welding ribs are heated with a hot plate heater type. After melting, the frame bodies to be joined are crimped together, and all the burrs that are generated can be contained within the escape groove, resulting in good welding without any burrs getting into the channels. .

Further, according to the above-mentioned means, the fused portion of the welding rib does not lift up and the entire area can be reliably welded, so that a good leak-proof seal of the laminated battery can be maintained for a long period of time. There is.

Furthermore, since the battery body is integrated using the method described above, there is no need for end plates for tightening and integrating the battery body from both ends using fastening members such as bolts and nuts. This has the effect of reducing the heavy illumination of the battery body.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the main part of the frame body for explaining one embodiment of the method for manufacturing a laminated battery of the present invention, FIG. 2 is a vertical cross-sectional view of the main part showing the welded state of the frame body, and FIG. FIG. 3 is an exploded perspective view of a main part illustrating a battery body of a zinc-odor accumulation cell, which is one of the conventional stacked batteries. 8 - Electrode plate, 8a... Electrode part, 8b... Frame, 14
... Welding rib, 15... Welding lip, 16... Relief groove. Outside'l! , Figure 1 is a vertical cross-sectional view of the main parts of the frame b 6 - Separator plate 8 Intermediate electrode 8a Electrode plate part 12 Frame 13 Channel 14 Welding rib 5 Welding layer lip 16 - Extension groove 17 - Bottom plate heater type 2nd Figure 3: Vertical sectional view of the main parts of the laminated frame Figure 3: Disassembled perspective view of the main parts

Claims (1)

[Claims] (1) A method for manufacturing a laminated battery in which flat electrode plates and separator plates are alternately laminated and integrated, wherein the electrode plate is integrally attached to a rectangular flat electrode and the outer peripheral edge of the electrode. The insulating frame made of synthetic resin is formed, and the height f is formed on the insulating frame along the outer peripheral edge of the electrode.
a welded rib having a width b, the separator plate is formed of a rectangular flat separator, a synthetic resin frame integrally formed on the outer peripheral edge of the separator, and one opposite side of the frame. a pair of electrolyte flow channels provided respectively in the electrolyte flow channels, and a height d and a width b formed on the frame outside the electrolyte flow channels and along the outer peripheral edge of the electrode.
a welding rib of the electrode plate and the separator plate, and a relief groove of a depth e and a groove width b formed in the frame body in contact with both sides of the welding rib of the frame body, and the welding rib of the electrode plate and separator plate. The heights f and d, the width b, the depth e of the relief groove, and the width a of the groove are formed in a relationship that satisfies the following formula, and 5/7≦b(f+d)≦3
/2 (2ae) a≧2/3b A plurality of electrode plates are stacked with the separator plate sandwiched between the electrode plates, and the welding ribs of the opposing electrode plates and separator plate are heated and melted, and the welding ribs are crimped together. forming a battery reaction chamber in a portion surrounded by the electrode, an insulating frame, and a frame and divided into two by the separator, and forming an electrolyte in the frame in the battery reaction chamber. A method for producing a laminated battery in which an electrolyte is circulated through a flow path.