JP2782867B2 - Manufacturing method of laminated battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of the Invention The present invention relates to an electrode plate having a synthetic resin insulating frame formed on the outer periphery of a conductive member, and a separator plate having a synthetic resin frame formed on the outer periphery of a separator. The present invention relates to a method for manufacturing a laminated battery in which frame members of battery constituent members are welded and integrated with each other.

B. Summary of the Invention The present invention relates to a method of manufacturing a laminated battery in which flat electrode plates and separator plates are alternately laminated and integrated, wherein the electrode plate is formed of a rectangular flat electrode and an outer peripheral edge of the electrode. A separator plate formed of a synthetic resin insulating frame integrally formed with the portion and welding ribs having a height of f and a width of b formed on the insulating frame along the outer peripheral edge of the electrode; A rectangular plate-shaped separator, a synthetic resin frame integrally formed on the outer peripheral edge of the separator, a pair of electrolytic solution flow paths provided on one of two opposite sides of the frame, and an electrolytic solution flow path. Outside and along the outer peripheral edge of the electrode, a welding rib having a height d and a width b formed on the frame, and formed on the frame in contact with both sides of the welding rib of the frame, Formed by a depth e and a clearance groove having a groove width a, the heights f and d of the welding ribs of the electrode plate and the separator plate, and the width b. Further, the depth e of the relief groove and the dimension of the groove width a are formed so as to satisfy the following expression, and 5/7 ≦ b (f + d) ≦ 3/2 (2a e) a ≧ 2 / 3b A plurality of electrode plates are stacked with the separator plate interposed therebetween, and the welding ribs of the opposing electrode plates and the separator plate are heated and melted together with pressure bonding to be surrounded by the electrodes, the insulating frame and the frame, and A method for manufacturing a laminated battery, comprising: forming a battery reaction chamber in a portion divided into two sections by a separator; and circulating an electrolyte in the battery reaction chamber through an electrolyte flow path formed in a frame.

C. Conventional technology Recently, the development of a battery power storage system has been promoted, and as a part thereof, a zinc-bromine battery, a zinc-chlorine battery,
Redox flow batteries and the like have been developed.

These employ an electrical series lamination configuration in order to extract a high voltage. The outline of the configuration will be described by taking a zinc-bromine battery as an example.

The zinc-bromine battery is mainly of an electrolyte circulation type and is composed of a battery main body, an electrolyte storage tank, and a piping system for circulating an electrolyte between them.

Conventionally, a battery main body has bipolar electrodes, as illustrated in FIG. 3, and is electrically connected in series by laminating the electrodes.

In FIG. 3, reference numeral 6 denotes a separator plate in which an insulating frame is integrally formed on the outer periphery of the separator, and reference numeral 8 denotes a bipolar electrode plate in which the insulating frame is integrally formed on the outer periphery of the conductive member.

A spacer mesh 7 and a packing 5 are stacked on both sides of the electrode plate 8 with a separator plate interposed therebetween to form a single cell, and a plurality of, for example, 30 cells are stacked. The electrode 3, the laminated end plate 2, and the tightening end plate 1 are overlapped and tightened with bolts and nuts to form an integral structure.

Electrolyte is stored in the battery body thus configured in the electrode plate 8,
The positive electrode manifold 9 and the negative electrode manifold 10 formed at the four corners of the frame of the separator plate 6 and the packing 5, and flow into and out of the electrolyte solution flow channel of the channel 13 and the microchannel 13 a.

The conductive member of the electrode plate 8 is formed of a carbon plastic thin plate formed by kneading a conductive material such as carbon into plastic, and the separator portion of the separator plate 6 is formed of a microporous film and formed of the electrode plate 8 and the separator. The frame of the plate 6 is made of a polyolefin resin such as polyethylene.

D. Problems to be Solved by the Invention As described above, in the conventional laminated battery, each electrode plate and the frame of the separator plate are pressed against each other by tightening from both ends of the laminated battery, and each unit cell and the electrolyte solution flow path are formed. Because of the formation, each frame body of the battery constituent member causes creep due to the action of the electrolytic solution, or the strength of the frame body shrinks and expands due to a change in the environment in which the battery is placed, so that the strength is weakened, and each adjacent frame body There is a problem that a gap is formed between the gaps and liquid leaks from the gap.

Therefore, attempts have been made to integrate the adjacent electrode plates and the respective frames of the separator body by heat fusion. In order to heat-weld the frames, welding ribs are set up on each frame, and these are melted and pressed against each other to be welded.
At the time of pressing, the molten resin of the welding ribs enters the manifold or the channel along the side surface of the frame, and closes the electrolytic solution flow path, thereby hindering the flow of the electrolytic solution.

In view of the above, the present invention provides a method of manufacturing a laminated battery that can be laminated and integrated well so that burrs do not block an electrolytic solution flow path such as a channel even when a frame portion of an electrode plate and a separator plate is thermally fused. The purpose is to provide a new method.

E. Means for Solving the Problems The method for manufacturing a laminated battery according to the present invention is characterized in that a cross-section of a height f from the surface of the frame and a horizontal axis b is provided at a joint portion of one of the frames to be mutually welded such as an electrode plate and a separator. A rectangular welding rib is provided, and a welding rib having a rectangular cross section having a height d from the surface of the frame and a width of d is provided at a joint portion of the other frame, and both lateral sides of the welding rib are provided. A relief groove having a depth e and a groove width a is formed from the surface of the frame body and having a rectangular cross section. 2a e) Set so that the cross-sectional area is 1.5 times or less,
The groove width a of the clearance groove is set to be 2/3 times the lateral width b of the welding rib, and then the opposite welding ribs are heated and melted by a hot plate heater type, and then the frame to be joined is formed. It is characterized in that the bodies are pressed together, and the fused welding ribs are welded to each other and laminated and integrated.

F. Function By the above-described means, when welding the hot plate, all the burrs generated from the molten welding ribs enter the escape groove, and the frames are integrated without overflowing. Therefore, an effect is achieved that the burrs do not block the electrolytic solution flow path such as a channel.

In addition, the above-mentioned operation | movement produces | generates not only the case where this invention is applied to a zinc-bromine battery, but also the same effect | action is applied when it applies to a laminated battery, such as a zinc-chlorine battery and a redox flow battery.

G. Examples Example 1 Hereinafter, an example of the method for manufacturing a laminated electrode according to the present invention will be described with reference to the first example.
This will be described with reference to FIGS.

Note that, in FIGS. 1 and 2, the third
The same reference numerals are given to portions corresponding to the drawings, and detailed description thereof will be omitted.

FIG. 1 is a longitudinal sectional view of a main part of FIG. 1, wherein 8b is a frame provided on the outer periphery of the electrode portion of the electrode plate before lamination and integration by hot plate welding, and 12 is provided on the outer periphery of the separator by hot plate welding. The frame before lamination and integration by the method.

In the frame 8b of the electrode plate, two welding ribs 14 having a rectangular cross section are symmetrically protruded on both sides thereof in parallel. The height of each welding rib 14 is f, and its width is b.

Further, the frame 12 of the separator plate is formed to be thicker than the frame 8b of the electrode plate, and a channel 13 composed of a rectangular cross-sectional groove serving as a flow path for the electrolyte is formed substantially at the center. ing. Channels 13 are provided on the front and back of the frame 12 of the separator plate.
When sandwiched on both sides of the electrode frame 8b of the electrode plate,
A welding rib 15 is provided at a position corresponding to the welding rib 14. Further, on both lateral sides of the welding rib 15, a relief groove 16 having a rectangular cross section for releasing a flash generated at the time of hot plate welding is formed. The height of the welding rib 15 from the surface of the frame 12 is d, and the width thereof is d.

Further, the depth of the escape groove 16 from the surface of the frame 12 is e,
Let the groove width be a. Then, set the width of channel 13 to G
The escape groove 16 is located at a distance c from each side.

At the same time, the dimensions of each part are configured to satisfy the following formula.

b (f + d) ≦ 3/2 (2a e) a ≧ 2/3 (b) b ≧ 0.8 mm Next, the frame 8b of the electrode plate and the frame 12 of the separator plate configured as described above are used. Are stacked and integrated by hot plate welding.

First, as shown by a chain line in FIG. 1, the front ends of the welding ribs 14 and 15 are melted by a hot plate heater mold 17. Next, as shown in FIG.

At the time of this welding, the burrs of the welding ribs 14 and 15 enter the escape groove 16, satisfying this, and do not enter the channel 13, and are welded.

In the case of a dimensional configuration that does not satisfy the above-mentioned and formulas, the burrs of the welding ribs 14 and 15 flow into the microchannel 13 and block it.

For example, in the configuration of the present embodiment, a = 3 mm, b = 1.5 mm, d = 1.0 mm, e
= 0.5 mm, f = 1.0 mm, and c were set to be as small as possible. Ten sets were prepared and tested by hot plate welding. As a result, nine out of ten sets were welded well and the channel 13
The burrs did not block.

However, for comparison with this embodiment, a = 1.5 mm, e = 0.3 mm
The other dimensions are the same as those of the present embodiment, b = 1.5 mm, d = 1.0 mm, f =
As a result of preparing 10 sets of 1.0 mm and welding them with a hot plate, up to 9 sets out of 10 sets had burrs in the channel 13 and blocked them.

However, even if the shape of the escape groove 16 as described above is used,
If the distance c between the channel 16 and the channel 13 is made extremely large, it is possible to prevent the burrs from entering the channel 13, but in this case, the frame bodies 8b and 12 must be made so large, and the battery body becomes large. , Can not be realized.

Example 2 Step area of welding rib; b (f + d) Cross section of escape groove; 10 sets each having a different ratio of 2ae were prepared and tested by hot plate welding to prevent channels and the like from being blocked by burrs. Shows the number of good results.

When the ratio of the step area was 1.6 or more, the step area of the escape groove became too large, and a recess was formed in the frame portion.

Further, the groove width a of the clearance groove may be at least 2/3 of the lateral width b of the welding rib. If the groove width a is smaller than 2/3 of the horizontal axis b of the welding rib, the resin of the welding rib does not fill the clearance groove, and a space is generated in the clearance groove, resulting in insufficient fusion.

H. Effects of the Invention As described in detail above, according to the method for manufacturing a laminated battery of the present invention, the height f is set at the joint portion of one of the frame members to which the battery components such as the electrode plate and the separator plate are welded to each other. A welding rib having a rectangular cross section with a width b is provided, and a relief groove is provided at each of the joining portions of the other frame body on both lateral sides of the welding rib, and the height is d.
Thus, a welding rib having a rectangular cross section having a width b is provided, and a relief groove having a rectangular cross section having a depth e and a groove width a is provided on both lateral sides thereof, and furthermore, the cross-sectional area b ( f +
d) is not more than 1.5 times the sum (2a e) of the cross-sectional area of the clearance groove, and the width a of the clearance groove is equal to the width b of the welding rib.
Is set so that it is 2/3 or more, and then the welding ribs facing each other are heated and melted by a hot plate heater type, and then the frames to be joined are press-bonded, and all the burrs generated are released. It can be accommodated in the groove, and has an effect that good welding can be performed without burrs entering the channel.

Further, according to the above-mentioned means, since the fusion bonding portion of the welding rib can be reliably welded over the entire surface without being lifted, a good liquid leakage prevention seal of the laminated battery can be maintained for a long time. There is.

Further, since the battery body is integrally formed by the above-described means, a fastening end plate for tightening and integrating the battery body from both ends using fastening members such as bolts and nuts is unnecessary. This has the effect of reducing the weight of the battery body.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a frame for explaining an embodiment of a method of manufacturing a laminated battery according to the present invention. FIG. 2 is a vertical sectional view of a main part showing a welded state of the frame. FIG. 3 is an exploded perspective view illustrating a main part of a battery body of a zinc-bromine battery, which is one of the conventional stacked batteries. 8 ... electrode plate, 8a ... electrode part, 8b ... frame, 14 ... welding rib, 15 ... welding rib, 16 ... escape groove.

Claims (1)

(57) [Claims] 1. A method of manufacturing a laminated battery comprising a plate-shaped electrode plate and a separator plate alternately laminated and integrated, wherein the electrode plate is provided on a rectangular plate-shaped electrode and an outer peripheral portion of the electrode. A synthetic resin insulating frame formed integrally, and a height f formed on the insulating frame along the outer peripheral edge of the electrode;
A welding plate having a width b, wherein the separator plate is a rectangular plate-like separator, a synthetic resin frame integrally formed on an outer peripheral edge of the separator, and one of two opposite sides of the frame. A pair of electrolytic solution flow paths respectively provided, and a welding rib having a height d and a width b formed on the frame body outside the electrolytic solution flow path and along the outer peripheral edge of the electrode. , In contact with both sides of the welding rib of the frame,
And a relief groove having a depth e and a groove width a formed in the frame body. The groove width a is formed so as to satisfy the following equation: 5/7 ≦ b (f + d) ≦ 3/2 (2a e) a ≧ 2 / 3b The separator plate is sandwiched between the electrode plates. A plurality of electrode plates are laminated, and the welding ribs of the opposing electrode plates and separator plate are heated and melted, and pressed and integrated to be surrounded by the electrodes, the insulating frame and the frame, and the separator A method for manufacturing a laminated battery, comprising: forming a battery reaction chamber in a divided section; and circulating an electrolyte through the electrolyte flow path formed in the frame in the battery reaction chamber.