JP2890852B2 - Manufacturing method of laminated battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery component frame such as 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 body members are welded and integrated with each other.

[0002]

2. Description of the Related Art Recently, the development of battery power storage systems has been promoted.
Chlorine batteries and redox flow batteries 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.

[0003] This zinc-bromine battery is mainly of an electrolyte circulation type as shown in the principle diagram of FIG. 7, and comprises a battery main body, an electrolyte storage tank, and a piping system for circulating the electrolyte between these. It is composed of

That is, in FIG. 7, a single cell of a stacked battery is partitioned by a separator to form a positive electrode chamber and a negative electrode chamber, and a positive electrode electrolyte is circulated from a positive electrode side storage tank by a pump in the positive electrode chamber. A negative electrode electrolyte is circulated from the negative electrode side storage tank by a pump.

Conventionally, as shown in FIG. 8, a battery main body has bipolar electrodes, which are stacked and electrically connected in series.

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

The spacer mesh 7 and the packing 5 are superposed on both sides of the separator plate 6 with the separator plate 6 interposed between the electrode plates 8 to constitute a single cell.
The cells are stacked, and finally, the collecting electrode 3, the laminated end plate 2 and the tightening end plate 1 are stacked on both ends, respectively, and are integrally formed by tightening with bolts and nuts.

In the thus constructed battery body, the electrolytic solution is supplied to the positive electrode manifold 9 and the negative electrode manifold 10 formed at the four corners of the electrode plate 8, the frame of the separator plate 6 and the packing 5, the channel 13, the microchannel Inflow and outflow through the electrolyte passage.

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 fine porous film. The frame of the separator plate 6 is made of a polyolefin resin such as polyethylene.

[0010]

As described above, in the conventional laminated battery, each electrode plate and the frame of the separator plate are pressed against each other by pressing 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 of each frame body is reduced, and 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 together, welding ribs are erected on each frame, which are melted and pressed and welded to each other. There is a problem that the electrolyte enters the manifold or the channel along the side surface and blocks the electrolytic solution flow path, thereby obstructing the flow of the electrolytic solution.

[0012] In view of the above, the present invention provides a good lamination and integration so that even if the frame portions of the electrode plate and the separator plate are heat-sealed, the burrs do not block the electrolytic solution flow path such as the channel. It is an object of the present invention to provide a new method of manufacturing a laminated battery that can be used.

[0013]

According to a method of manufacturing a laminated battery of the present invention, an electrode plate is formed of a rectangular flat electrode, a synthetic resin insulating frame integrally formed on an outer peripheral portion of the electrode, and Along the outer peripheral edge of the electrode, formed by welding ribs of height f and width b formed on the insulating frame, the separator plate is formed of a rectangular plate-shaped separator, and an outer peripheral edge of the separator. A synthetic resin frame formed integrally with the portion, a pair of electrolyte solution flow paths provided on one of two opposite sides of the frame body, and a frame formed on the frame body in the electrolyte solution flow channel. Posts, outside the electrolyte flow path and along the outer peripheral edge of the separator, a height d formed on the frame, a welding rib having a width b, and on 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 height f and d of the welding rib of the plate, the width b, the depth e of the escape groove, and the dimension of the groove width a are formed so as to satisfy the following expression: 5/7 ≦ b (f + d) ≦ 3 (2ae ) / 2, a ≧ 2b / 3, a plurality of the electrode plates are laminated with the separator plate interposed between the electrode plates, and the welding ribs of each of the opposing electrode plates and the separator plate are heated and melted, and are integrally pressed. And a battery reaction chamber is formed in a portion surrounded by the electrodes, the insulating frame and the frame, and divided into two parts by the separator, and an electrolytic solution is formed in the frame in the battery reaction chamber. And circulated through the electrolyte flow path.

[0014]

When the welding ribs of the electrode plate and the separator plate facing each other are heated and melted, all the burrs generated by the fused welding ribs enter the escape groove. At this time, the cross-sectional area b (f + d) of the welding ribs mutually welded is set so as not to exceed 1.5 times the sum (2ae) of the cross-sectional areas of the clearance grooves on both sides. The generated burrs do not overflow from the escape grooves to block the electrolyte flow paths such as channels, and the frames are integrated.

When the welding rib is heated, the frame at the position where the electrolytic solution flow path of the separator plate and the rib of the electrode plate superimposed on the separator plate intersect is also heated and softened. For this reason, when pressed, the frame of the electrode plate bends and tends to deform, but the post formed in the electrolyte channel supports the frame of the electrode plate. Thus, the frame of the electrode plate does not bend and deform, and the frame of the electrode plate does not block the electrolytic solution flow path. Therefore, a required flow rate of the electrolyte is ensured, and a situation in which a gas is generated due to a decrease in the flow rate and the battery is broken can be avoided.

The cross-sectional area b (f + d) of the welding rib is 5 /
7, and the groove width a of the clearance groove is set to be not less than 2/3 times the lateral width b of the welding rib, so that the resin of the welding rib does not fill the clearance groove and the space in the clearance groove is formed. There is no danger.

Note that the above-described operation can be achieved not only when the present invention is applied to a zinc-bromine battery, but also when it is applied to a stacked battery such as a zinc-chlorine battery and a redox flow battery.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the method for manufacturing a laminated battery according to the present invention will be described below with reference to FIGS. In FIGS. 1 to 6, parts corresponding to those in FIG. 8 described above are denoted by the same reference numerals, and detailed description thereof will be omitted. In FIG. 3, the packing 5 in FIG. 8 is not shown.

FIG. 4 is an exploded perspective view of the main part of FIG.
It is a principal part longitudinal cross-sectional view which shows A cross section. In FIG. 4, 8b
Is a frame provided on the outer periphery of the electrode 8a of the electrode plate 8 before lamination and integration by the hot plate welding method, and 12 is provided on the outer periphery of the separator 6a of the separator plate 6 before the lamination and integration by the hot plate welding method. Frame.

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

The frame 12 of the separator plate 6 is formed to be thicker than the frame 8b of the electrode plate 8, and is formed at substantially the center thereof with a groove having a rectangular cross section serving as a flow path for the electrolyte. A channel 13 is formed. On the front and back of the frame 12 of the separator plate 6, welding ribs 15 are provided on both sides of the channel 13 at positions corresponding to the welding ribs 14 when the frame is overlapped with the frame 8b of the electrode plate 8. Further, on both lateral sides of the welding rib 15, a relief groove 16 having a rectangular cross section is formed for releasing and accumulating a flash generated at the time of hot plate welding.

The height of the welding rib 15 from the surface of the frame 12 is d, and its width is b. Also, the escape groove 16
The depth from the surface of the frame 12 is e, and the groove width is a. The width of the channel 13 is defined as G, and the escape groove 16 is located at a distance c from each side of the channel 13. At the same time, the dimensions of each part are configured to satisfy the following formula.

B (f + d) ≦ 3 (2ae) / 2 (1) a ≧ 2b / 3 (2) b ≧ 0.8 mm (3) The frame 8b of the electrode plate 8 and the frame 12 of the separator plate 6 configured as described above are laminated and integrated by a hot plate welding method. First, as shown by a dashed line in FIG. 4, the distal ends of the welding ribs 14 and 15 are melted by a hot plate heater mold 17.

Next, as shown in FIG. 5, welding is performed by pressing.
At the time of this welding, the burrs of the welding ribs 14 and 15 form the escape grooves 1.
6 satisfies the above condition and does not enter the channel 13 and is welded.

Here, in the process of laminating and integrating by the hot plate welding method as described above, as a result of observing the BB section of FIG. 3, it was found that the electrolytic solution flow path was blocked as shown in FIG. . That is, the welding rib 1 on the upper side of the flow path shown in FIG.
When 4 is heated, its surroundings are also heated and become soft. After that, when they are integrated by crimping, as shown in FIG.
b is bent, and the electrolyte flow path (channel 13) on the lower side of the frame 8b in the figure is closed. For this reason, the flow stops, and it becomes impossible to supply an appropriate amount of the electrolytic solution into the battery.

Therefore, as shown in FIG. 1 (the same parts as in FIG.
A post 18 having the same height as the effective height of the channel 13 is provided on the top. By protruding the post 18 in this way, the BB cross section of FIG. 3 is shown as in FIG. 2, and when the welding ribs 14 and 15 are integrated by pressure after welding, the frame 8b is placed in the channel. It is supported by the provided post 18 and the flow of the electrolyte is not obstructed.

The post 18 is formed at the same time as the frame 12 is formed. The height of the post 18 may be less than the effective height of the channel 13 depending on the situation. Set the width so as not to obstruct the flow.

If the dimensional configuration does not satisfy the above-mentioned expressions (1), (2) and (3), each of the welding ribs 14 and 1
The burrs flow into the channel 13 and block it.

For example, as a configuration of the present embodiment, a numerical value satisfying the above equations (1), (2) and (3) is expressed by 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 hot plate welding was performed. As a result, nine out of ten sets were successfully welded, and the channel 13 was formed. The burrs did not block.

However, for comparison with this embodiment, a = 1.
As a result of preparing a set of 5 mm, e = 0.3 mm and b = 1.5 mm, d = 1.0 mm, and f = 1.0 mm, which are the same dimensions as those of the present embodiment, and preparing a test by welding with a hot plate, Up to 9 out of 10 sets had burrs in the channel 13 and blocked it.

However, even if the clearance groove 16 has the above-described shape, if the distance c between the clearance groove 16 and the channel 13 is extremely large, it is possible to prevent the burrs from entering the channel 13. The size of the bodies 8b and 12 must be increased accordingly, and the size of the battery body is increased, which cannot be realized.

Next, 10 sets of the cross-sectional area of the welding rib; b (f + d) the cross-sectional area of the escape groove; Table 1 shows the number of samples that obtained good results without blocking.

[0033]

[Table 1]

When the cross-sectional area ratio becomes 1.6 or more,
The cross-sectional area of the escape groove became too large, and a recess was formed in the frame portion.

The groove width a of the clearance groove may be at least 2/3 of the width b of the welding rib. The groove width a is the width b of the welding rib.
If it is smaller than 2/3, the resin of the welding rib does not fill the clearance groove, and a space is created in the clearance groove, and the welding becomes insufficient.

In the above embodiment, the case where the present invention is applied to a zinc-bromine battery is described. However, the present invention is not limited to this, and the present invention may be applied to a stacked battery such as a zinc-chlorine battery, a redox flow battery, or hot plate welding. The present invention can be applied to other chemical cells to which the present invention is applied, and in these cases, the same operation and effect as described above can be obtained.

[0037]

As described above in detail, according to the method of 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 members such as the electrode plate and the separator plate are welded. A welding rib having a rectangular cross section having a width b is provided, and a welding rib having a height d and a rectangular cross section having a width b is provided at a joint portion of the other frame body, and a frame body for an electrolyte flow path such as a channel is provided. An upper post is provided, and a depth e is provided on both lateral sides of the welding rib.
A relief groove having a rectangular cross section with a groove width a is provided.
ae) is set to be 1.5 times or less, and the width a of the clearance groove is set to be not less than two-thirds of the width b of the welding rib. Since the frames are heated and melted and the frames to be bonded are pressed together, the following excellent effects can be obtained.

(1) All the burrs generated by the press-fitting of the frames can be accommodated in the escape groove, and good welding can be performed without the burrs entering the electrolytic solution flow path such as a channel.

(2) Even if the frame on the electrode plate side is softened by the heat at the time of heat welding, the frame is not deformed because the frame is supported by the post at the time of pressure bonding. For this reason, it is possible to prevent the frame from blocking the electrolyte flow path and stopping the flow of the electrolyte. As a result, there is no possibility that gas is generated due to the deterioration of the flow rate and the battery is destroyed. Therefore, a laminated battery having stable performance can be manufactured, and the life is prolonged.

(3) According to the above-described means, since the fusion bonding portion of the welding rib can be securely welded over the whole without floating, a good liquid leakage prevention seal of the laminated battery can be maintained for a long time. .

(4) Since the battery main body is manufactured integrally by the above-described means, a fastening end plate for tightening and integrating the battery main body from both ends using a fastening member such as a bolt or a nut is unnecessary. Becomes 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 one embodiment of a method for manufacturing a laminated battery of the present invention.

FIG. 2 is an explanatory view showing a cross-section taken along line BB of an essential part exploded perspective view of FIG.

FIG. 3 is an exploded perspective view of a main part for describing one embodiment of a method for manufacturing a laminated battery of the present invention.

FIG. 4 is a longitudinal sectional view of a main part of a frame before completion, showing one embodiment of the method of manufacturing a laminated battery according to the present invention.

FIG. 5 is a longitudinal sectional view of a main part showing a welded state of a frame for explaining one embodiment of a method of manufacturing a laminated battery of the present invention.

FIG. 6 is an explanatory view showing a cross section taken along line BB of FIG. 3 when a frame before completion is used.

FIG. 7 is a principle diagram of a zinc-bromine battery.

FIG. 8 is an exploded perspective view showing a main part of a battery body of a zinc-bromine battery, which is one of conventional stacked batteries.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 ... Current collecting electrode 6 ... Separator plate 6a ... Separator 8 ... Electrode plate 8a ... Electrode 8b, 12 ... Frame 9 ... Positive electrode manifold 10 ... Negative electrode manifold 13 ... Channel 14, 15 ... Welding rib 16 ... Escape groove 17 ... Hot plate Heater type 18 ... post

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiromichi Ito 2-1-1-17 Osaki, Shinagawa-ku, Tokyo Inside Meidensha Co., Ltd. (56) References JP-A-62-12075 (JP, A) JP-A-62- 195849 (JP, A) Jiko 47-26185 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01M 2 / 02,8 / 18,12 / 08

Claims (1)

(57) [Claims] 1. A method for manufacturing a laminated battery in which a plate-like electrode plate and a separator plate are alternately laminated and integrated, wherein the electrode plate is provided on a rectangular plate-like electrode and an outer peripheral portion of the electrode. An insulating frame made of synthetic resin integrally formed, and a welding rib having a height f and a width b formed on the insulating frame along the outer peripheral portion of the electrode, and the separator plate is formed. A rectangular plate-like separator, a synthetic resin frame integrally formed on the outer peripheral edge of the separator, a pair of electrolyte solution flow paths provided on one of two opposite sides of the frame, A post formed on the frame in the liquid flow path, and a height d and a width b formed on the frame outside the electrolyte flow path and along the outer peripheral edge of the separator. A depth e and a groove width formed in the frame body in contact with both sides of the welding rib and the welding ribs of the frame body; a, and the dimensions of the heights f and d of the welding ribs of the electrode plate and the separator plate, the width b, the depth e of the clearance groove, and the groove width a satisfy the following expression. 5/7 ≦ b (f + d) ≦ 3 (2ae) / 2, a ≧ 2b / 3, a plurality of the electrode plates being laminated with the separator plate interposed between the electrode plates, and each of the electrode plates facing each other While heating and melting the welding ribs of the separator plate and pressing and integrating, a battery reaction chamber is formed in a portion surrounded by the electrode, the insulating frame and the frame, and divided into two parts by the separator, A method for manufacturing a laminated battery, wherein an electrolyte is circulated in the battery reaction chamber through an electrolyte passage formed in the frame.